CN110873417A - Air conditioner and self-cleaning control method thereof - Google Patents

Abstract

The invention discloses an air conditioner and a self-cleaning control method thereof, and belongs to the technical field of air conditioners. The control method comprises the following steps: acquiring the coil temperature and the fan current in the defrosting stage of the air conditioner operation self-cleaning mode; adjusting the rotating speed of the fan based on the temperature comparison result of the coil temperature and the frost-condensation critical temperature and the variation of the coil temperature; and determining the compensation amount of the rotating speed according to the variation of the fan current. The control method for self-cleaning of the air conditioner provided by the invention can adjust the rotating speed of the fan in the frost condensation stage based on the temperature comparison result of the coil pipe temperature and the frost condensation critical temperature, is different from the existing running mode that the fan is stopped or the rotating speed is fixed, and the rotating speed of the fan which is dynamically adjusted can be more matched with the temperature change in the air conditioner, so that the frost condensation rate in the frost condensation stage is accelerated by utilizing the changed rotating speed, the actual frost condensation amount is improved, and the actual cleaning effect of the self-cleaning mode is ensured.

Description

A kind of air conditioner and its self-cleaning control method

technical field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method for self-cleaning thereof.

Background technique

When the air conditioner operates in cooling or heating mode, the air in the external environment enters the interior of the body along the air inlet, and is blown back into the external environment through the air outlet after the heat exchange of the heat exchange fins. Impurities such as mixed dust and large particles will also enter the interior of the indoor unit with the intake air flow. Although the dust filter installed at the air inlet of the air conditioner can filter most of the dust and particles, there will still be a small amount of tiny dust. It cannot be completely blocked and filtered. With the long-term use of the air conditioner, these dusts will gradually deposit and adhere to the surface of the heat exchange fins. Due to the poor thermal conductivity of the dust covering the outer surface of the heat exchanger, it will directly affect the heat exchange fins. Therefore, in order to ensure the heat exchange efficiency of the air conditioner, the air conditioner needs to be cleaned regularly.

Generally, the cleaning methods of air conditioners in the prior art mainly include manual cleaning and air conditioner self-cleaning. Among them, the air conditioner self-cleaning methods are mainly divided into frost condensation stage and defrosting stage. Among them, the indoor unit of the split air conditioner For example, in the frost condensation stage, the air conditioner first runs in cooling mode and increases the refrigerant output to the indoor heat exchanger, so that the moisture in the indoor air can gradually condense into frost or ice on the outer surface of the heat exchanger. , in this process, the condensed frost layer can be combined with the dust, so as to strip the dust from the outer surface of the heat exchanger; after that, in the defrosting stage, the air conditioner operates in the heating mode, so that the condensed on the outer surface of the heat exchanger The frost layer melts, and the dust will be collected into the water tray along with the melted water flow, so that the self-cleaning purpose of the indoor unit of the air conditioner can be achieved; similarly, when cleaning the outdoor unit of the split air conditioner, follow the The opposite process to the indoor unit performs the self-cleaning operation, that is, the air conditioner first operates the heating mode (the temperature of the outdoor unit decreases, and the frost condenses) and then operates the cooling mode (the temperature of the outdoor unit increases, and the frost melts).

However, in the existing self-cleaning mode process, the fan in the frost condensation stage generally stops running or runs at a set wind speed. After collecting a large amount of user usage data, it is found that the actual frost condensation in the above-mentioned fan setting method in the self-cleaning mode The effect is not good, which affects the cleaning effect of the air conditioner self-cleaning mode.

SUMMARY OF THE INVENTION

The present invention provides an air conditioner and a self-cleaning control method thereof, aiming at solving the problem of poor self-cleaning effect caused by the above setting method of the fan. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor is it intended to identify key/critical elements or delineate the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the detailed description that follows.

According to a first aspect of the present invention, there is provided a control method for air conditioner self-cleaning, the control method comprising:

Obtain the coil temperature and fan current in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the change of the coil temperature, the speed of the fan is adjusted; and the compensation of the speed is determined according to the change of the fan current.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

Based on the temperature comparison between the coil temperature and the frost critical temperature, adjust the fan speed, including:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional embodiment, adjusting the rotational speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, further comprising:

When the coil temperature is less than the critical temperature of frost condensation, the temperature difference between the critical temperature of frost condensation and the coil temperature is less than the preset temperature difference threshold, and the variation of the coil temperature is less than the preset variation threshold, control the fan from the low wind speed The corresponding rotational speed value is reduced to the first target rotational speed value;

The first compensation amount of the rotational speed is associated with the change amount of the fan current.

In an optional embodiment, the control method further includes:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional embodiment, adjusting the rotational speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, further comprising:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, and the variation of the coil temperature is greater than the preset variation threshold, control the fan to reduce the speed value corresponding to the low wind speed to the second target speed value;

The second compensation amount of the rotational speed is associated with the variation of the fan current; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

According to a second aspect of the present invention, an air conditioner is provided, the air conditioner includes a body and a controller, wherein the controller is used for:

Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the temperature comparison result of the coil temperature and the critical frost condensation temperature and the variation of the coil temperature, the speed of the fan is adjusted; and the compensation amount of the rotation speed is determined according to the variation of the coil temperature.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the coil temperature is less than the frost condensation critical temperature, the temperature difference between the frost condensation critical temperature and the coil temperature is less than the preset temperature difference threshold, and the variation of the coil temperature is less than the preset variation threshold, the fan is controlled from low wind to wind. The speed value corresponding to the gear is reduced to the first target speed value;

The first compensation amount of the rotational speed is associated with the change amount of the fan current.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional implementation manner, the controller is specifically used for:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, and the variation of the coil temperature is greater than the preset variation threshold, control the fan to reduce the speed value corresponding to the low wind speed to the second target speed value;

The second compensation amount of the rotational speed is associated with the variation of the fan current; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

The beneficial effect that the present invention adopts above-mentioned technical scheme has is:

The air conditioner self-cleaning control method provided by the present invention can adjust the rotation speed of the fan in the frost condensation stage based on the temperature comparison result between the coil temperature and the frost condensation critical temperature. The speed of the fan can be more matched with the temperature change inside the air conditioner, so as to use the changing speed to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount, thereby ensuring the actual cleaning effect of the self-cleaning mode.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

1 is a schematic flow chart 1 of a method for controlling self-cleaning of an air conditioner according to an exemplary embodiment of the present invention;

FIG. 2 is a second schematic flowchart of a method for controlling self-cleaning of an air conditioner according to another exemplary embodiment of the present invention;

FIG. 3 is a schematic flow chart 3 of a method for controlling self-cleaning of an air conditioner according to another exemplary embodiment of the present invention;

4 is a fourth schematic flowchart of a method for controlling self-cleaning of an air conditioner according to another exemplary embodiment of the present invention;

FIG. 5 is a schematic flowchart 5 of the control method for air conditioner self-cleaning according to the present invention according to another exemplary embodiment;

6 is a sixth schematic flowchart of a method for controlling self-cleaning of an air conditioner of the present invention according to another exemplary embodiment;

7 is a seventh schematic flowchart of a method for controlling self-cleaning of an air conditioner according to another exemplary embodiment of the present invention;

FIG. 8 is a schematic flow chart 8 of a method for controlling self-cleaning of an air conditioner of the present invention according to another exemplary embodiment.

Detailed ways

The following description and drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless expressly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the invention includes the full scope of the claims, along with all available equivalents of the claims. Various embodiments may be referred to herein by the term "invention," individually or collectively, for convenience only, and are not intended to automatically limit the scope of this application to any if more than one invention is in fact disclosed. A single invention or inventive concept. Herein, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation and do not require or imply any actual relationship between these entities or operations or order. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method or apparatus comprising a list of elements includes not only those elements, but also others not expressly listed elements, or also include elements inherent to such a process, method or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. The various embodiments herein are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and it is sufficient to refer to each other for the same and similar parts between the various embodiments. For the methods, products, etc. disclosed in the embodiments, since they correspond to the method parts disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

The air conditioner of the invention comprises an indoor heat exchanger, an outdoor heat exchanger, a throttling device and a compressor. The indoor heat exchanger, the outdoor heat exchanger, the throttling device and the compressor are connected by a refrigerant pipeline to form a refrigerant circulation loop, and the refrigerant passes through The refrigerant circulation loop flows along the flow directions set by different operation modes to realize its heating, cooling and self-cleaning functions.

In an embodiment, the operation modes of the air conditioner of the present invention include a cooling mode, a heating mode and a self-cleaning mode, wherein the cooling mode is generally used in high temperature conditions in summer to reduce the indoor ambient temperature; the heating mode is generally used in low temperature in winter It is used to increase the indoor ambient temperature; and the self-cleaning mode is generally a user-selected function mode or a self-starting function, which can automatically clean the heat exchanger when there is a lot of dust and dirt accumulated on the heat exchanger. operate.

When the air conditioner operates in the cooling mode, the set refrigerant flow direction is that the high-temperature refrigerant discharged from the compressor first flows through the outdoor heat exchanger to exchange heat with the outdoor environment, then flows into the indoor heat exchanger for heat exchange with the indoor environment, and finally the refrigerant returns to the compressor. In this process, the refrigerant flowing through the outdoor heat exchanger releases heat to the outdoor environment, and the refrigerant flowing through the indoor heat exchanger absorbs heat from the indoor environment, and circulates through the refrigerant in the refrigerant circulation loop. , the indoor heat can be continuously discharged to the outdoor environment, so as to achieve the cooling purpose of reducing the indoor ambient temperature.

In the heating mode, the set refrigerant flow direction means that the high-temperature refrigerant discharged from the compressor first flows through the indoor heat exchanger to exchange heat with the outdoor environment, and then flows into the outdoor heat exchanger for heat exchange with the indoor environment, and finally the refrigerant returns. In this process, the refrigerant flowing through the indoor heat exchanger releases heat to the indoor environment, and the refrigerant flowing through the outdoor heat exchanger absorbs heat from the outdoor environment, and passes through the refrigerant in the refrigerant circulation loop. The circulating flow can continuously release the outdoor heat into the indoor environment, so as to achieve the heating purpose of increasing the indoor ambient temperature.

Generally, since the indoor heat exchanger is directly used to change the indoor temperature environment, the cleanliness of the indoor heat exchanger can directly affect the user experience. Therefore, the main application object of the self-cleaning mode of the air conditioner of the present invention is the indoor heat exchanger. Of course, the self-cleaning mode of the air conditioner of the present invention can also be used to clean the outdoor heat exchanger. Therefore, in a specific embodiment, when the air conditioner of the present invention performs the cleaning process, it can only clean the indoor heat exchanger and the outdoor heat exchanger. Either clean one or both heat exchangers. It should be understood that if the existing air conditioner adopts the same or similar control method as the present invention to perform self-cleaning operation on the indoor and outdoor heat exchangers, it should also be included in the protection scope of the present invention.

Taking the self-cleaning process of the indoor heat exchanger as an example, the working process of the air conditioner operating in the self-cleaning mode of the present invention mainly includes two stages in sequence: the indoor heat exchanger defrosting stage and the indoor heat exchanger defrosting stage. Among them, during the frost condensation stage of the indoor heat exchanger, the indoor heat exchanger of the indoor unit can condense ice and frost; Impurities such as dust can be separated from the indoor heat exchanger with the melted condensed water, and the cleaning treatment of the indoor heat exchanger is completed.

Specifically, during the operation of the air conditioner in the cooling mode, if the power of the compressor is increased, the output of the refrigerant is increased, etc., the amount of low-temperature refrigerant input to the indoor unit can be increased, and the excess refrigerant cooling capacity can reduce the internal temperature of the indoor unit. When the temperature inside the indoor unit is lower than the critical temperature for frost condensation (such as 0°C), the water vapor in the air flowing through the indoor unit will gradually condense into frost inside the indoor unit. Under the condition that the air conditioner is controlled in the refrigerant flow direction limited by the cooling mode in the frost condensation stage of the heat exchanger, the freezing and frosting operation of the indoor heat exchanger is realized by adjusting the operating parameters of the compressor, fan, throttling device and other components.

During the operation of the air conditioner in the heating mode, since the high-temperature refrigerant flows through the indoor heat exchanger first, the cooling capacity of the high-temperature refrigerant can increase the internal temperature of the indoor unit, and the temperature inside the indoor unit is higher than the frost threshold. When the temperature value (such as 0°C), the frost condensed inside the indoor unit will gradually melt and drip, so that the frost can be separated from the indoor heat exchanger. The control method of the present invention is to realize indoor heat exchange by adjusting the operating parameters of the compressor, fan, throttling device and other components under the condition that the air conditioner is controlled in the refrigerant flow direction limited by the heating mode in the defrosting stage of the indoor heat exchanger. defrost operation.

In the same way, when the outdoor heat exchanger is self-cleaning, when the air conditioner flows in the refrigerant flow direction limited by the heating mode, the medium and high temperature refrigerants that flow out of the indoor heat exchanger will flow into the outdoor after being throttled by the throttling device. The heat exchanger is a low-temperature refrigerant. Therefore, the low-temperature refrigerant can reduce the temperature of the outdoor heat exchanger. When the temperature inside the outdoor unit is lower than the critical frost temperature value (such as 0°C), the water vapor in the air flowing through the outdoor unit It will gradually condense into frost inside the outdoor unit. In this way, while the indoor heat exchanger is melted and frosted, the outdoor heat exchanger can be condensed and frosted.

After that, the indoor heat exchanger completes defrosting and defrosting in the defrosting stage of the indoor heat exchanger, the self-cleaning of the indoor heat exchanger is completed, and the air conditioner enters the defrosting stage of the outdoor heat exchanger. At this time, the air conditioner is controlled to be limited by the cooling mode again. The flow direction of the high-temperature refrigerant is changed, and the flow direction of the high-temperature refrigerant discharged from the compressor changes, and flows through the outdoor heat exchanger first, so that the heat of the high-temperature refrigerant can be used to realize the melting and defrosting of the outdoor heat exchanger, and complete the outdoor heat exchanger. Self-cleaning process.

In the above-mentioned self-cleaning process, each stage can be carried out according to a preset duration. For example, the frost condensation stage of the indoor heat exchanger can be preset to 10 minutes, and the defrost stage of the indoor heat exchanger can be preset to 12 minutes. After entering the frost condensation stage of the indoor heat exchanger in the self-cleaning mode, the air conditioner can start the timer. When it reaches 10 minutes, the air conditioner enters the defrosting stage of the indoor heat exchanger, and the defrosting stage of the indoor heat exchanger lasts for 12 minutes. Self-cleaning is completed, and the air conditioner exits self-cleaning mode.

Since the air conditioner is switched to the flow direction defined by the cooling mode or the heating mode, the on/off and rotational speed of the fans of the indoor and outdoor units also need to be controlled accordingly. The fan is generally closed or running at low speed, and the outdoor fan is running; while in the defrosting stage of the indoor heat exchanger, the indoor fan is running, and the outdoor air is closed or running at low speed. Therefore, the indoor and outdoor units are generally timed separately during the self-cleaning process, and when a preset time period is reached, the fans and other components of the air conditioner can be controlled to switch states accordingly.

In the above-mentioned self-cleaning process of the air conditioner, the fan in the frost condensation stage generally stops running or runs at the set wind speed. After collecting a large amount of user usage data, it is found that the actual frost condensation effect of the above fan setting method in the self-cleaning mode is Not good, which affects the cleaning effect of the air conditioner's self-cleaning mode.

Therefore, in view of the above-mentioned possible problems, the present invention provides an air conditioner and a self-cleaning control method thereof, aiming at solving the problem of poor self-cleaning effect caused by the control mode of the fan being shut down or fixed rotational speed.

FIG. 1 is a schematic flow chart 1 of a method for controlling self-cleaning of an air conditioner according to an exemplary embodiment of the present invention.

As shown in FIG. 1 , the present invention provides a control method for air conditioner self-cleaning. The main steps of the control method include:

S101. Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

This embodiment mainly takes the indoor unit as the cleaning object for illustration, and the cleaned heat exchanger for the self-cleaning mode is the indoor heat exchanger. Therefore, both the frost condensation stage and the defrosting stage in the self-cleaning process are indoor heat exchangers. The water vapor state changes on the heat exchanger.

In this embodiment, the air conditioner is also provided with a separate temperature sensor, which is installed adjacent to the coil of the indoor heat exchanger and can be used to detect the real-time temperature of the coil of the indoor unit of the air conditioner; the coil temperature obtained in step S101 is It is the coil temperature of the indoor unit detected by the temperature sensor when the self-cleaning process is in the frost condensation stage.

Optionally, the control method of the present application is mainly to realize the promotion effect of the fan speed adjustment in the frost condensation stage on the frost condensation effect; and in the final stage of the frost condensation stage in the self-cleaning mode, since the temperature of the indoor heat exchanger has In a relatively low temperature state, and after the frost condensation process in the previous period of the frost condensation stage, the fan speed adjustment in the last stage of the frost condensation stage has little effect on the frost condensation effect, which mainly affects the frost condensation stage. The frost condensation effect of the frost condensation process in the previous time period; therefore, the coil temperature obtained in step S101 may be the coil temperature parameter in the previous time period except the last stage of the frost condensation stage; an exemplary , the time point at which the temperature sensor detects the temperature of the coil may be the time point in the previous period of the frost condensation stage. For example, if the set duration of the frost condensation stage of the indoor heat exchanger is 10 minutes, the temperature obtained in step S101 is the temperature The temperature data of the sensor in the 1-7 min. The 7-10 min is the last stage of the frost condensation stage mentioned above, so no temperature detection is performed during this period.

Optionally, the time range within the frost condensation stage at which the temperature sensor detects the indoor ambient temperature may be determined according to the initial coil temperature before the air conditioner executes the self-cleaning mode; for example, a time range and the initial coil temperature are preset. In this relationship, the time range is positively correlated with the initial coil temperature, that is, the higher the initial coil temperature, the greater the proportion of the time range to the total duration of the frost condensation stage; the higher the initial coil temperature low, the smaller the proportion of this time range to the total duration of the frost condensation stage. Exemplarily, when the initial coil temperature is in the temperature range of 15 to 18°C, the proportion of the total duration of the frost condensation stage in the time range is 70%, that is, when the set duration of the frost condensation stage is 10 minutes, the initial When the coil temperature is in the temperature range of 15 to 18°C, the corresponding detection time point is 1-7min; when the initial coil temperature is in the temperature range of 11 to 13°C, the proportion of the time range to the total duration of the frost condensation stage is 40%, that is, when the set duration of the frost condensation stage is 10min, the detection time point corresponding to the temperature range of the initial coil temperature of 11 to 13°C is the 1st to 4th min. In this way, when the initial coil temperature is higher, due to the large temperature difference between the frost critical temperature and the initial coil temperature, the time required for the indoor heat exchanger to decrease from the initial coil temperature to the frost critical temperature or even a lower temperature The longer the fan speed adjustment is, the more obvious the effect of the fan speed adjustment is in the cooling process. Therefore, the corresponding temperature detection time range is longer; and in the case of the lower initial coil temperature, due to the frost critical temperature and If the temperature difference of the initial coil temperature is small, the time for the indoor heat exchanger to decrease from the initial coil temperature to the frost critical temperature or even lower temperature is shorter. Therefore, in order to ensure the accuracy of the fan adjustment on the temperature, the corresponding The shorter the duration of the time range for temperature detection.

S102 , adjusting the rotational speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature.

The air conditioner self-cleaning control method provided by the present invention can adjust the rotation speed of the fan in the frost condensation stage based on the temperature comparison result between the coil temperature and the frost condensation critical temperature. The speed of the fan can be more matched with the temperature change inside the air conditioner, so as to use the changing speed to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount, thereby ensuring the actual cleaning effect of the self-cleaning mode.

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

In this way, in step S102, based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the speed of the fan is adjusted, including: when the coil temperature is greater than the frost condensation critical temperature, controlling the fan to run at a set low wind speed.

For example, if the temperature of the inner coil is Toil and the critical temperature of frost condensation is Te, then when Toil>Te, the fan will operate at the set low wind speed; at this time, since the temperature of the inner coil is higher than the critical temperature of frost condensation , although the water vapor in the air will not condense into frost, it begins to transform from gaseous state to liquid state. The fan operates at a low wind speed to speed up the air flow inside the indoor unit, so that the frosted dew in the indoor unit can be evenly distributed to ensure follow-up. During the frosting process, the amount of frosting is uniform, reducing the occurrence of problems such as too thin local frosting layer and insufficient frosting.

Optionally, in step S102, adjusting the rotational speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, further includes: when the coil temperature is less than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is When the value is less than the preset temperature difference threshold, control the fan to reduce the speed value corresponding to the low wind speed to the target speed value.

For example, when Toil<Te and Te-Toil<△t, the fan is reduced from the set low wind speed to the target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, but The difference between the two is not large, the water vapor in the air gradually condenses into frost at a slower condensation speed, and the fan runs at a target speed value lower than the low wind gear to reduce the adverse effect of excessive airflow on frost condensation. It is ensured that the water vapor in the air or the condensed condensed water can have sufficient condensation time to transform from gaseous or liquid to solid frost at the position that is currently in contact with the indoor unit components (such as indoor heat exchangers).

Optionally, the target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Optionally, in step S102, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and further includes: when the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a preset temperature difference threshold, controlling the speed of the fan. The fan runs at the set low wind speed.

For example, in the case of Te-Toil>△t, the fan will be lowered again at the set low wind speed; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, and the difference between the two is relatively small is large, the water vapor and condensed water in the air have been fully condensed inside the indoor unit; considering that the cooling capacity inside the indoor unit comes from the indoor heat exchanger, in order to make the components in the indoor unit slightly far from the indoor heat exchanger The water vapor on the air conditioner can also condense firmly, and the fan operates at a low wind speed to speed up the cooling capacity of the indoor heat exchanger to be transported inside the air conditioner, so that the temperature of most parts of the indoor unit is similar to ensure that the frosting effect of each part is consistent.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining a preset temperature difference threshold based on the current indoor temperature and a preset rule; wherein the preset rule It is used to characterize the corresponding relationship between the current indoor temperature and the temperature difference threshold.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the temperature difference threshold. In the corresponding relationship, the current indoor temperature and the temperature difference threshold are positively correlated; when the current indoor temperature is higher, because the air conditioner is executing the self-cleaning process There is still heat exchange with the indoor environment, and the heat in the indoor environment enters the interior of the indoor unit. Therefore, it is necessary to increase the temperature range for the indoor unit to perform frost condensation at a slower condensation speed. Therefore, the temperature difference threshold can be set to a larger value; on the contrary, when the current indoor temperature is smaller, the Set the temperature difference threshold to a small value to speed up the overall progression of the frosting phase.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

FIG. 2 is a second schematic flow chart of a method for controlling the self-cleaning of an air conditioner according to the present invention, according to another exemplary embodiment.

As shown in Figure 2, the present invention provides another control method for air conditioner self-cleaning. The main steps of the control method include:

S201. Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

In this embodiment, for the specific execution flow of step S201, reference may be made to step S101 in the foregoing, which is not repeated here.

S202 , adjusting the rotation speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature; wherein, the adjustment rate of the rotation speed is determined according to the temperature comparison result.

The air conditioner self-cleaning control method provided by the present invention can adjust the rotation speed of the fan in the frost condensation stage based on the temperature comparison result between the coil temperature and the frost condensation critical temperature. The speed of the fan can be more matched with the temperature change inside the air conditioner, so as to use the changing speed to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount, thereby ensuring the actual cleaning effect of the self-cleaning mode.

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

In this way, in step S202, based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the speed of the fan is adjusted, including: when the coil temperature is greater than the frost condensation critical temperature, controlling the fan to run at a set low wind speed.

For example, if the temperature of the inner coil is Toil and the critical temperature of frost condensation is Te, then when Toil>Te, the fan will operate at the set low wind speed; at this time, since the temperature of the inner coil is higher than the critical temperature of frost condensation , although the water vapor in the air will not condense into frost, it begins to transform from gaseous state to liquid state. The fan operates at a low wind speed to speed up the air flow inside the indoor unit, so that the frosted dew in the indoor unit can be evenly distributed to ensure follow-up. During the frosting process, the amount of frosting is uniform, reducing the occurrence of problems such as too thin local frosting layer and insufficient frosting.

Optionally, in step S202, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and further includes: when the coil temperature is less than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is When the value is less than the preset temperature difference threshold, control the fan to reduce the speed value corresponding to the low wind speed to the first target speed value;

For example, when Toil<Te and Te-Toil<△t, the fan is reduced from the set low wind speed to the first target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation , but the difference between the two is not large, the water vapor in the air gradually condenses into frost at a slower condensation speed, and the fan runs at the first target speed value lower than the low wind speed to reduce the airflow too fast to condense the frost. It ensures that the water vapor in the air or the condensed condensed water can have sufficient condensation time to convert from gaseous or liquid to solid frost at the position currently in contact with the indoor unit components (such as indoor heat exchangers).

Optionally, the first target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Here, the fan is reduced from the rotational speed value corresponding to the low wind speed to the first target rotational speed value at the first adjustment rate. That is, when the temperature comparison result is Toil<Te, and Te-Toil<Δt, the adjustment rate of the fan is the first adjustment rate; optionally, the first adjustment rate is 20 rpm, that is, the fan is 20 rpm The rate of /min is reduced from the speed value corresponding to the low wind speed to the first target speed value.

Here, switching between the low wind gear and the first target speed value at the first adjustment rate can improve the stability of the speed switching and ensure the stable operation of the fan; at the same time, the smooth switching of the speed can also make the airflow in the indoor unit Smooth flow and reduce the occurrence of problems such as turbulence caused by wind speed switching.

Optionally, in step S202, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and further includes: when the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a preset temperature difference threshold, controlling The fan is reduced from the rotational speed value corresponding to the low wind gear to the second target rotational speed value.

For example, in the case of Te-Toil>△t, the fan is reduced from the set low wind speed to the second target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, and the difference between the two is The difference between the two is large, the water vapor in the air gradually condenses into frost at a faster condensation speed, and the fan runs at the second target speed value lower than the low wind speed, which can reduce the power consumption of its operation, and use the heat in the indoor unit. The transmission between the solid components realizes the further condensation of the frost and ensures the frost condensation effect.

Here, the second target rotational speed value is smaller than the first target rotational speed value; when the first target rotational speed value is a wind speed value between the low wind gear position and the breeze gear position, the second target rotational speed value may be a value corresponding to the breeze gear position The rotational speed value; alternatively, the target rotational speed value may be a rotational speed value between the low wind gear and the light wind gear. When the first target rotational speed value is a rotational speed value corresponding to the breeze gear, the second target rotational speed value is a rotational speed value lower than the rotational speed value corresponding to the breeze gear.

If a comparison result is obtained that the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, the fan is at the first target rotational speed value, then step S202 in this embodiment is to control the blower from the first target rotational speed value Reduce to the second target speed value.

Here, the fan is reduced from the rotational speed value corresponding to the low wind speed to the first target rotational speed value at the second adjustment rate. That is, when the temperature comparison result is Te-Toil>Δt, the adjustment rate of the fan is the second adjustment rate; the first adjustment rate is greater than the second adjustment rate, optionally, the second adjustment rate is 20 rpm, that is The fan is reduced from the rotational speed value corresponding to the low wind speed to the second target rotational speed value at a rate of 20 rpm.

Here, switching between the low wind gear and the second target speed value at the second adjustment rate can improve the stability of the speed switching and ensure the stable operation of the fan; at the same time, the smooth switching of the speed can also make the airflow in the indoor unit Smooth flow and reduce the occurrence of problems such as turbulence caused by wind speed switching.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining a preset temperature difference threshold based on the current indoor temperature and a preset rule; wherein the preset rule It is used to characterize the corresponding relationship between the current indoor temperature and the temperature difference threshold.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the temperature difference threshold. In this corresponding relationship, the current indoor temperature and the temperature difference threshold are positively correlated; when the current indoor temperature is higher, the air conditioner is performing the self-cleaning process. There is still heat exchange with the indoor environment, and the heat in the indoor environment enters the interior of the indoor unit. Therefore, it is necessary to increase the temperature range for the indoor unit to perform frost condensation at a slower condensation speed. Therefore, the temperature difference threshold can be set to a larger value; on the contrary, when the current indoor temperature is smaller, the Set the temperature difference threshold to a small value to speed up the overall progression of the frosting phase.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

FIG. 3 is a third schematic flowchart of a method for controlling self-cleaning of an air conditioner of the present invention according to another exemplary embodiment.

As shown in Figure 3, the present invention provides another control method for air conditioner self-cleaning. The main steps of the control method include:

S301. Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

In this embodiment, for the specific execution flow of step S301, reference may be made to step S101 in the foregoing, which is not repeated here.

S302, based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, adjust the rotation speed of the fan, and determine the compensation amount of the rotation speed according to the variation of the coil temperature.

The air conditioner self-cleaning control method provided by the present invention can adjust the rotation speed of the fan in the frost condensation stage based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and compensate the rotation speed of the fan according to the change of the coil temperature. Due to the existing fan shutdown or fixed speed operation mode, the speed of the dynamically adjusted fan can be more matched with the temperature change inside the air conditioner, so as to use the changed speed to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount. Guarantees the actual cleaning effect of the self-cleaning mode.

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

In this way, in step S302, based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the speed of the fan is adjusted, including: when the coil temperature is greater than the frost condensation critical temperature, controlling the fan to run at a set low wind speed.

For example, if the temperature of the inner coil is Toil and the critical temperature of frost condensation is Te, then when Toil>Te, the fan will operate at the set low wind speed; at this time, since the temperature of the inner coil is higher than the critical temperature of frost condensation , although the water vapor in the air will not condense into frost, it begins to transform from gaseous state to liquid state. The fan operates at a low wind speed to speed up the air flow inside the indoor unit, so that the dew condensed in the indoor unit can be evenly distributed to ensure subsequent follow-up. During the frosting process, the amount of frosting is uniform, reducing the occurrence of problems such as too thin local frosting layer and insufficient frosting.

Optionally, in step S302, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and further includes: when the coil temperature is less than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is When the value is less than the preset temperature difference threshold, control the fan to reduce the speed value corresponding to the low wind speed to the first target speed value;

For example, when Toil<Te and Te-Toil<△t, the fan is reduced from the set low wind speed to the first target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation , but the difference between the two is not large, the water vapor in the air gradually condenses into frost at a slower condensation speed, and the fan runs at the first target speed value lower than the low wind speed to reduce the airflow too fast to condense the frost. It ensures that the water vapor in the air or the condensed condensed water can have sufficient condensation time to convert from gaseous or liquid to solid frost at the position currently in contact with the indoor unit components (such as indoor heat exchangers).

Optionally, the first target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Here, when Toil<Te and Te-Toil<Δt, the first compensation amount for the fan speed is also determined according to the variation of the coil temperature.

Specifically, the air conditioner presets a corresponding relationship between the variation of the coil temperature and the compensation amount of the fan speed. Exemplarily, when the coil temperature decreases by A°C, the compensation amount corresponding to the rotation speed for each decrease of A°C is R1; For example, when the coil temperature decreases by 0.5°C, the compensation amount of the rotational speed is -20 revolutions.

In this embodiment, the compensation of the fan speed is based on the first target speed as the reference speed, and the coil temperature is based on the coil temperature when Toil<Te and Te-Toil<Δt are determined for the first time as the reference temperature ; For example, when it is determined for the first time that Toil<Te and Te-Toil<△t, the coil temperature is -3°C, and the first target speed value is 200r/min; When the coil temperature detected at a certain time is -5°C, the compensation amount of the speed can be further calculated and determined as -20*4=-80, and the speed of the fan is adjusted from 200r/min to 120r/min.

The above-mentioned compensation adjustment to the rotational speed of the fan of the present invention can make the rotational speed of the fan more suitable for the current frosting situation, which is beneficial to speed up the condensation speed of the frost on the indoor unit.

Optionally, in step S302, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and further includes: when the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a preset temperature difference threshold, controlling the speed of the fan. The fan is reduced from the rotational speed value corresponding to the low wind gear to the second target rotational speed value.

For example, in the case of Te-Toil>△t, the fan is reduced from the set low wind speed to the second target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, and the difference between the two is The difference between the two is large, the water vapor in the air gradually condenses into frost at a faster condensation speed, and the fan runs at the second target speed value lower than the low wind speed, which can reduce the power consumption of its operation, and use the heat in the indoor unit. The transmission between the solid components realizes the further condensation of the frost and ensures the frost condensation effect.

Here, the second target rotational speed value is smaller than the first target rotational speed value; when the first target rotational speed value is a wind speed value between the low wind gear position and the breeze gear position, the second target rotational speed value may be a value corresponding to the breeze gear position The rotational speed value; alternatively, the target rotational speed value may be a rotational speed value between the low wind gear and the light wind gear. When the first target rotational speed value is a rotational speed value corresponding to the breeze gear, the second target rotational speed value is a rotational speed value lower than the rotational speed value corresponding to the breeze gear.

If a comparison result is obtained that the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, the fan is at the first target rotational speed value, then step S302 in this embodiment is to control the blower from the first target rotational speed value Reduce to the second target speed value.

Here, in the case of Te-Toil>Δt, the second compensation amount for the fan speed is also determined according to the variation of the coil temperature.

Specifically, the air conditioner presets a corresponding relationship between the variation of the coil temperature and the compensation amount of the fan speed. Exemplarily, when the coil temperature decreases by B°C, the compensation amount corresponding to the rotation speed for each decrease of B°C is R2; For example, when the coil temperature decreases by 0.5°C, the compensation amount of the rotational speed is -10 revolutions.

In this embodiment, the compensation of the fan speed is based on the second target speed as the reference speed, and the coil temperature is based on the coil temperature when it is determined that Te-Toil>Δt is the first time as the reference temperature; It is determined that when Te-Toil>△t is satisfied, the coil temperature is -8°C, and the second target speed value is 150r/min; then the coil temperature is repeatedly detected several times, and the coil temperature detected at a certain time is - When the temperature is 9.5°C, the compensation amount of the rotational speed can be further calculated to be -20*3=-60, and the rotational speed of the fan can be adjusted from 150r/min to 90r/min.

Here, the second compensation amount of the rotational speed is associated with the variation of the coil temperature; the second target rotational speed value is smaller than the first target rotational speed value, and the second compensation amount is smaller than the first compensation amount.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining a preset temperature difference threshold based on the current indoor temperature and a preset rule; wherein the preset rule It is used to characterize the corresponding relationship between the current indoor temperature and the temperature difference threshold.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the temperature difference threshold. In the corresponding relationship, the current indoor temperature and the temperature difference threshold are positively correlated; when the current indoor temperature is higher, because the air conditioner is executing the self-cleaning process There is still heat exchange with the indoor environment, and the heat in the indoor environment enters the interior of the indoor unit. Therefore, it is necessary to increase the temperature range for the indoor unit to perform frost condensation at a slower condensation speed. Therefore, the temperature difference threshold can be set to a larger value; on the contrary, when the current indoor temperature is smaller, the Set the temperature difference threshold to a small value to speed up the overall progression of the frosting phase.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

FIG. 4 is a fourth schematic flowchart of a method for controlling self-cleaning of an air conditioner of the present invention according to another exemplary embodiment.

As shown in FIG. 4 , the present invention provides another control method for air conditioner self-cleaning. The main steps of the control method include:

S401. Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

In this embodiment, for the specific execution process of step S401, reference may be made to step S101 in the foregoing, which is not repeated here.

S402 , adjusting the rotational speed of the fan based on the temperature comparison result of the coil temperature and the frost condensation critical temperature and the variation of the coil temperature; and determining the compensation amount of the rotational speed according to the variation of the coil temperature.

The air conditioner self-cleaning control method provided by the present invention can adjust the rotation speed of the fan in the frost condensation stage based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, which is different from the existing fan shutdown or fixed The rotating speed of the dynamically adjusted fan can better match the temperature change inside the air conditioner, so as to use the changing rotating speed to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount, thereby ensuring the actual cleaning effect of the self-cleaning mode. .

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

Here, in step S402, based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, the speed of the fan is adjusted, including: when the coil temperature is greater than the frost condensation critical temperature, controlling the fan to set Low wind speed operation.

For example, if the coil temperature is Toil and the critical frost condensation temperature is Te, then when Toil > Te, the fan will operate at the set low wind speed; at this time, since the coil temperature is higher than the critical frost condensation temperature, the air Although the water vapor in the indoor unit will not condense into frost, it begins to transform from gaseous state to liquid state. Running the fan at low wind speed can speed up the air flow inside the indoor unit, so that the frosted dew in the indoor unit can be evenly distributed to ensure subsequent frost condensation. The amount of frost in the process is uniform, reducing the occurrence of problems such as too thin local frost layer and insufficient frost.

Optionally, in step S402, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, which also includes: when the coil temperature is less than the frost condensation critical temperature and the frost condensation critical temperature. When the temperature difference with the coil temperature is less than the preset temperature difference threshold and the variation of the coil temperature is less than the preset variation threshold, control the fan to reduce the rotation speed value corresponding to the low wind speed to the first target rotation speed value;

For example, when Toil<Te, Te-Toil<△t, and △Toil (change in coil temperature)<△T (change threshold), the fan is lowered from the set low wind speed to the first A target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, but the difference between the two is not large, and the change of the coil temperature is less than the preset change threshold, the air The water vapor gradually condenses into frost at a slow condensation speed, and the fan runs at the first target speed value lower than the low wind speed to reduce the adverse effect of the excessively fast airflow on the frost condensation, and to ensure that the water vapor in the air or the condensed water that has condensed There may be sufficient condensation time to convert from gaseous or liquid to solid frost at the location currently in contact with indoor unit components (eg, indoor heat exchangers).

Optionally, the first target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Here, when Toil<Te, Te-Toil<△t and △Toil (change in coil temperature)<△T (threshold of change), the change in coil temperature (△Toil) A first compensation amount for fan speed is determined.

Specifically, the air conditioner presets a corresponding relationship between the variation of the coil temperature and the compensation amount of the fan speed. Exemplarily, when the coil temperature decreases by A°C, the compensation amount corresponding to the rotation speed for each decrease of A°C is R1; For example, when the coil temperature decreases by 0.5°C, the compensation amount of the rotational speed is -20 revolutions.

In this embodiment, the compensation of the fan speed is based on the first target speed as the reference speed, and the coil temperature is based on the coil temperature when Toil<Te and Te-Toil<Δt are determined for the first time as the reference temperature ; For example, when it is determined for the first time that Toil<Te and Te-Toil<△t, the coil temperature is -3°C, and the first target speed value is 200r/min; When the coil temperature detected at a certain time is -5°C, it can be further calculated that △Toil is 2°C, and the compensation amount of the speed is -20*4=-80, then the speed of the fan is adjusted from 200r/min to 120r /min.

The above-mentioned compensation adjustment to the rotational speed of the fan of the present invention can make the rotational speed of the fan more suitable for the current frosting situation, which is beneficial to speed up the condensation speed of the frost on the indoor unit.

Optionally, in step S402, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, and further includes: when the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a predetermined temperature. When the set temperature difference threshold is set, and the variation of the coil temperature is greater than the preset variation threshold, control the fan to reduce the rotational speed value corresponding to the low wind speed to the second target rotational speed value;

For example, when Te-Toil>△t, and △Toil (change in coil temperature)>△T (change threshold), the fan is reduced from the set low wind speed to the second target speed value ; At this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, the difference between the two is large, and the change of the coil temperature is greater than the preset change threshold, then the water vapor in the air will increase rapidly. The condensation speed gradually condenses into frost, and the fan runs at the second target speed value lower than the low wind gear to reduce the power consumption of its operation, and utilizes the heat transfer between the various solid components of the indoor unit to further condense the frost and ensure condensation. Cream effect.

Here, the second target rotational speed value is smaller than the first target rotational speed value; when the first target rotational speed value is a wind speed value between the low wind gear position and the breeze gear position, the second target rotational speed value may be a value corresponding to the breeze gear position The rotational speed value; alternatively, the target rotational speed value may be a rotational speed value between the low wind gear and the light wind gear. When the first target rotational speed value is a rotational speed value corresponding to the breeze gear, the second target rotational speed value is a rotational speed value lower than the rotational speed value corresponding to the breeze gear.

If the comparison result is obtained that the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, the fan is at the first target rotational speed value, then step S402 in this embodiment is to control the blower from the first target rotational speed value Reduce to the second target speed value.

Here, in the case of Te-Toil>Δt and ΔToil>ΔT, the second compensation amount for the fan speed is also determined according to the variation of the coil temperature.

Specifically, the air conditioner presets a corresponding relationship between the variation of the coil temperature and the compensation amount of the fan speed. Exemplarily, when the coil temperature decreases by B°C, the compensation amount corresponding to the rotation speed for each decrease of B°C is R2; For example, when the coil temperature decreases by 0.5°C, the compensation amount of the rotational speed is -10 revolutions.

In this embodiment, the compensation of the fan speed is based on the second target speed as the reference speed, and the coil temperature is based on the coil temperature when it is determined that Te-Toil>Δt is the first time as the reference temperature; It is determined that when Te-Toil>△t is satisfied, the coil temperature is -8°C, and the second target speed value is 150r/min; then the coil temperature is repeatedly detected several times, and the coil temperature detected at a certain time is - When the temperature is 9.5°C, the compensation amount of the rotational speed can be further calculated to be -20*3=-60, and the rotational speed of the fan can be adjusted from 150r/min to 90r/min.

Here, the second compensation amount of the rotational speed is associated with the variation of the coil temperature; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining a preset temperature difference threshold based on the current indoor temperature and a preset rule; wherein the preset rule It is used to characterize the corresponding relationship between the current indoor temperature and the temperature difference threshold.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the temperature difference threshold. In the corresponding relationship, the current indoor temperature and the temperature difference threshold are positively correlated; when the current indoor temperature is higher, because the air conditioner is executing the self-cleaning process There is still heat exchange with the indoor environment, and the heat in the indoor environment enters the interior of the indoor unit. Therefore, it is necessary to increase the temperature range for the indoor unit to perform frost condensation at a slower condensation speed. Therefore, the temperature difference threshold can be set to a larger value; on the contrary, when the current indoor temperature is smaller, the Set the temperature difference threshold to a small value to speed up the overall progression of the frosting phase.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

FIG. 5 is a fifth schematic flow chart of a method for controlling self-cleaning of an air conditioner according to the present invention, according to another exemplary embodiment.

As shown in FIG. 5 , the present invention provides another control method for air conditioner self-cleaning. The main steps of the control method include:

S501. Obtain the fan current in the frost condensation stage of the air conditioner running in the self-cleaning mode;

This embodiment mainly takes the indoor unit as the cleaning object for illustration, and the cleaned heat exchanger for the self-cleaning mode is the indoor heat exchanger. Therefore, both the frost condensation stage and the defrosting stage in the self-cleaning process are indoor heat exchangers. The state of water vapor on the heat exchanger changes; the fan current obtained in step S501 is also the running current of the indoor fan used to deliver airflow to the indoor heat exchanger;

In this embodiment, the control process is mainly controlled by components such as controllers, computer boards, and MCUs set in the air conditioner, and the power supply circuit of the indoor fan is electrically connected to these components. Therefore, these components can obtain the power supply of the indoor fan. Fan current and other related operating parameters.

The principle of the present invention is that during the frost condensation stage of the self-cleaning mode of the air conditioner, since the frost gradually condenses on the indoor heat exchanger and other components, the frost layer will play a certain wind resistance effect, which is not suitable for the fan that transports the air. In other words, when the wind resistance of the indoor unit increases, in order to maintain the stability of the fan speed, the actual operating current of the fan should be greater than the case of no wind resistance or small wind resistance. In this way, the present invention can further judge the frost condensation situation inside the indoor unit in the frost condensation stage according to the change of the fan current, and then adjust the rotation speed of the fan to further promote the frost condensation process by using the adjusted fan.

Optionally, the control method of the present application is mainly to realize the promotion effect of the fan speed adjustment in the frost condensation stage on the frost condensation effect; and in the final stage of the frost condensation stage in the self-cleaning mode, since the temperature of the indoor heat exchanger has In a relatively low temperature state, and after the frost condensation process in the previous time period of the frost condensation stage, the fan speed adjustment in the final stage of the frost condensation stage has less impact on the frost condensation effect, and the wind resistance change is also small. It mainly affects the frost condensation effect of the frost condensation process in the previous time period of the frost condensation stage; so the fan current obtained in step S501 can be the current parameter in the previous time period except the last stage of the frost condensation stage. ; Exemplarily, the time point for obtaining the fan current may be a time point within the previous period of the frost condensation stage, for example, if the set duration of the indoor heat exchanger frost condensation stage is 10min, then the fan current obtained in step S101 is the current data in the 1st to 7th min, and the 7th to 10th min is the last stage of the frost condensation stage mentioned above, so the detection and acquisition of the current data is not carried out during this period.

Optionally, the time range within the frost condensation stage at which the time point when the fan current is obtained may be determined according to the initial coil temperature before the air conditioner executes the self-cleaning mode; for example, a relationship between the time range and the initial coil temperature is preset. , in this relationship, the time range is positively correlated with the initial coil temperature, that is, the higher the initial coil temperature, the greater the proportion of the time range to the total duration of the frosting stage; the lower the initial coil temperature, the The proportion of this time range to the total duration of the frosting phase is smaller. Exemplarily, when the initial coil temperature is in the temperature range of 15 to 18°C, the time range accounts for 70% of the total duration of the frost condensation stage, that is, when the set duration of the frost condensation stage is 10 minutes, the initial When the coil temperature is in the temperature range of 15 to 18°C, the corresponding detection time point is 1-7min; when the initial coil temperature is in the temperature range of 11 to 13°C, the proportion of the time range to the total duration of the frost condensation stage is 40%, that is, when the set duration of the frost condensation stage is 10min, the detection time point corresponding to the temperature range of the initial coil temperature of 11 to 13°C is the 1st to 4th min. In this way, when the initial coil temperature is higher, due to the large temperature difference between the frost critical temperature and the initial coil temperature, the time required for the indoor heat exchanger to decrease from the initial coil temperature to the frost critical temperature or even a lower temperature The longer the fan speed adjustment is, the more obvious the effect of the fan speed adjustment is during the cooling process. Therefore, the corresponding time range of the fan current detection and acquisition operation is longer; and when the initial coil temperature is lower, due to the critical frost condensation If the temperature difference between the temperature and the initial coil temperature is small, the time for the indoor heat exchanger to decrease from the initial coil temperature to the frost critical temperature or even a lower temperature is shorter. Therefore, in order to ensure the accuracy of the fan adjustment on the temperature, the The shorter the duration of the time range of the corresponding fan current detection and acquisition operation.

S502 , adjusting the rotational speed of the fan based on the comparison result between the fan current and the fan reference current.

Here, the reference current of the fan is the working current of the fan when the indoor unit is not frosted. Optionally, the working current is the working current of the fan after the air conditioner satisfies the trigger condition of the self-cleaning mode and before executing the self-cleaning mode.

The air conditioner self-cleaning control method provided by the present invention can adjust the rotational speed of the blower in the frost condensation stage based on the comparison result between the blower current and the blower reference current. The rotational speed can be more matched with the temperature change inside the air conditioner, so that the changing rotational speed can be used to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount, thereby ensuring the actual cleaning effect of the self-cleaning mode.

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

In this way, in step S502, adjusting the rotational speed of the fan based on the comparison result between the fan current and the fan reference current includes: when the fan current is equal to the fan reference current, controlling the fan to run at a set low wind speed.

For example, if the fan current is I, and the fan base current is Ie, then when I=Ie, the fan operates at the set low wind speed; at this time, since the fan current is equal to the fan base current, it means that the indoor unit is at this time. There is no wind resistance or very small wind resistance inside. The water vapor in the air has not condensed into frost in the indoor unit, but it has begun to transform from gas to liquid. Running the fan at a low wind speed can speed up the air flow inside the indoor unit and make the indoor unit The dew in the middle frosting can be evenly distributed to ensure that the amount of frosting in the subsequent frosting process is even, and the occurrence of problems such as too thin local frosting layer and insufficient frosting can be reduced.

Optionally, in step S502, adjusting the rotational speed of the blower based on the comparison result between the blower current and the blower reference current, further comprising: when the blower current is greater than the blower reference current, controlling the blower to reduce the rotational speed value corresponding to the low wind speed to the target rotational speed value.

For example, in the case of I>Ie, the fan is reduced from the set low wind speed to the target speed value; at this time, since the fan current is greater than the fan reference current, it can be determined that there is a wind speed caused by frost condensation in the indoor unit. The water vapor in the air gradually condenses into frost, and the fan runs at the target speed value lower than the low wind gear to reduce the adverse effect of too fast airflow on the frost condensation, and to ensure that the water vapor in the air or the condensed water that has been condensed can be in the current and indoor environment. The location where the machine parts (such as indoor heat exchangers) come into contact have sufficient condensation time to convert from gaseous or liquid to solid frost.

Optionally, the target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Optionally, in step S502, adjusting the rotational speed of the fan based on the comparison result between the fan current and the fan reference current, further includes: when the current difference between the fan current and the fan reference current is greater than the current difference threshold, controlling the fan to set a low value. The windshield operates.

For example, in the case of I-Ie>△i, the fan will be lowered again at the set low wind speed; at this time, since the fan current is greater than the fan reference current, and the difference between the two is large, the air The water vapor and condensed water in the indoor unit have been fully condensed inside the indoor unit; considering that the cooling capacity inside the indoor unit comes from the indoor heat exchanger, therefore, in order to make the water vapor on the components slightly far from the indoor heat exchanger in the indoor unit also It can condense firmly, and the fan operates at a low wind speed to speed up the transportation of the cooling capacity of the indoor heat exchanger in the air conditioner, so that the temperature of most parts of the indoor unit is similar, and the frost effect of each part is consistent.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining the reference current of the fan based on the current indoor temperature and a preset rule; wherein the preset rule is used for Characterize the correspondence between the current indoor temperature and the reference current of the fan.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the fan reference current. In the corresponding relationship, the current indoor temperature and the fan reference current are positively correlated; when the current indoor temperature is higher, because the air conditioner is performing automatic In the cleaning process, there is still heat exchange with the indoor environment, and the heat in the indoor environment enters the indoor unit. Therefore, the reference current of the fan can be set to a larger value to increase the variation range of the fan current and delay the entry into the I-Ie. > △i, increase the total time that the indoor unit performs frost condensation at a slower condensation speed, and reduce the adverse effect of delaying frost formation caused by the heat exchange between the indoor unit and the indoor environment; conversely, in the current indoor When the temperature is lower, set the reference current of the fan to a lower value to speed up the overall process of the frost condensation stage.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

FIG. 6 is a sixth schematic flowchart of a method for controlling self-cleaning of an air conditioner according to the present invention, according to another exemplary embodiment.

As shown in Figure 6, the present invention provides another control method for air conditioner self-cleaning. The main steps of the control method include:

S601. Obtain the fan current in the frost condensation stage of the air conditioner running in the self-cleaning mode;

In this embodiment, for the specific execution manner of step S601, reference may be made to step S501 in the foregoing description, which will not be repeated here.

S602. Adjust the rotational speed of the blower based on the comparison result between the blower current and the blower reference current; wherein, the rate of adjustment of the rotational speed is determined according to the rate of change of the blower current.

Here, the reference current of the fan is the working current of the fan when the indoor unit is not frosted. Optionally, the working current is the working current of the fan after the air conditioner satisfies the trigger condition of the self-cleaning mode and before executing the self-cleaning mode.

The air conditioner self-cleaning control method provided by the present invention can adjust the rotational speed of the blower in the frost condensation stage based on the comparison result between the blower current and the blower reference current. The rotational speed can be more matched with the temperature change inside the air conditioner, so that the changing rotational speed can be used to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount, thereby ensuring the actual cleaning effect of the self-cleaning mode.

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

In this way, in step S602, adjusting the rotational speed of the fan based on the comparison result between the fan current and the fan reference current includes: when the fan current is equal to the fan reference current, controlling the fan to run at a set low wind speed.

For example, if the fan current is I, and the fan base current is Ie, then when I=Ie, the fan operates at the set low wind speed; at this time, since the fan current is equal to the fan base current, it means that the indoor unit is at this time. There is no wind resistance or very small wind resistance inside. The water vapor in the air has not condensed into frost in the indoor unit, but it has begun to transform from gas to liquid. Running the fan at a low wind speed can speed up the air flow inside the indoor unit and make the indoor unit The dew in the middle frosting can be evenly distributed to ensure that the amount of frosting in the subsequent frosting process is even, and the occurrence of problems such as too thin local frosting layer and insufficient frosting can be reduced.

Optionally, in step S602, the rotational speed of the blower is adjusted based on the comparison result between the blower current and the blower reference current, and further includes: when the blower current is greater than the blower reference current, controlling the blower to reduce the rotational speed value corresponding to the low wind speed to the first level. target speed value;

For example, in the case of I>Ie, the fan is reduced from the set low wind speed to the first target speed value; at this time, since the fan current is greater than the fan reference current, it can be determined that there is a frost condensation in the indoor unit. Wind speed, the water vapor in the air gradually condenses into frost, and the fan runs at the target speed value lower than the low wind gear to reduce the adverse effect of excessive air flow on frost condensation, and to ensure that the water vapor in the air or the condensed condensed water can be in the current state. The location in contact with indoor unit components (such as indoor heat exchangers) has sufficient condensation time to convert from gaseous or liquid to solid frost.

Optionally, the first target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Here, the fan is reduced from the rotational speed value corresponding to the low wind speed to the first target rotational speed value at the first adjustment rate. That is, when the comparison result between the fan current and the fan reference current is I>Ie, the adjustment rate of the fan is the first adjustment rate; optionally, the first adjustment rate is associated with the rate of change of the fan current. Optionally, when When the current change of the fan current per minute is A, the first adjustment rate of the fan is R1 revolutions/min. For example, when the current change of the fan current per minute is 0.05A, the first adjustment rate of the fan is 20 rev/min, that is, the fan is reduced from the rotational speed value corresponding to the low wind speed to the first target rotational speed value at a rate of 20 rpm/min.

Here, the current variation of the fan current per minute is A, which can be calculated by dividing the current difference between I and Ie by the time interval between two consecutive processes when the control process determines the comparison result of I>Ie for the first time.

Here, switching between the low wind gear and the first target speed value at the first adjustment rate can improve the stability of the speed switching and ensure the stable operation of the fan; at the same time, the smooth switching of the speed can also make the airflow in the indoor unit Smooth flow and reduce the occurrence of problems such as turbulence caused by wind speed switching.

Optionally, in step S602, the rotational speed of the fan is adjusted based on the comparison result between the fan current and the fan reference current, and further includes: when the current difference between the fan current and the fan reference current is greater than the current difference threshold, controlling the fan to switch from a low wind speed. The corresponding rotational speed value is reduced to the second target rotational speed value;

For example, in the case of I-Ie>△i, the fan is reduced from the set low wind speed to the first target speed value; at this time, since the fan current is greater than the fan reference current, and the difference between the two Large, empty, the water vapor in the air gradually condenses into frost at a faster condensation speed, and the fan runs at the second target speed value lower than the low wind gear to reduce the power consumption of its operation. The transfer between the components realizes the further condensation of frost and ensures the frost condensation effect.

Here, the fan is reduced from the rotational speed value corresponding to the low wind speed to the second target rotational speed value at the second adjustment rate. That is, when the comparison result of the fan current and the fan reference current is I-Ie>Δi, the adjustment rate of the fan is the second adjustment rate; optionally, the second adjustment rate is associated with the change rate of the coil temperature, which can be Optionally, when the rate of change of the coil temperature is B, the second adjustment rate of the fan is R2 revolutions/min. For example, when the rate of change of the coil temperature is 0.5°C/min, the second adjustment rate of the fan is is 10 rpm, that is, the fan is reduced from the rotational speed value corresponding to the low wind speed to the second target rotational speed value at a rate of 10 rpm/min.

Here, the change rate of the coil temperature is B, which can be calculated by dividing the difference of the coil temperature detected between the two consecutive processes by the time interval when the control process determines that the comparison result of I-Ie>△i is obtained for the first time. get.

Here, the indoor unit of the air conditioner is further provided with a temperature sensor near the coil, and the temperature sensor can be used to detect the temperature of the coil of the indoor heat exchanger.

Here, the second target rotational speed value is smaller than the first target rotational speed value; when the first target rotational speed value is a wind speed value between the low wind gear position and the breeze gear position, the second target rotational speed value may be a value corresponding to the breeze gear position The rotational speed value; alternatively, the target rotational speed value may be a rotational speed value between the low wind gear and the light wind gear. When the first target rotational speed value is a rotational speed value corresponding to the breeze gear, the second target rotational speed value is a rotational speed value lower than the rotational speed value corresponding to the breeze gear.

If a comparison result is obtained that the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, the fan is at the first target rotational speed value, then step S602 in this embodiment is to control the blower from the first target rotational speed value Reduce to the second target speed value.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining the reference current of the fan based on the current indoor temperature and a preset rule; wherein the preset rule is used for Characterize the correspondence between the current indoor temperature and the reference current of the fan.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the fan reference current. In the corresponding relationship, the current indoor temperature and the fan reference current are positively correlated; when the current indoor temperature is higher, because the air conditioner is performing automatic In the cleaning process, there is still heat exchange with the indoor environment, and the heat in the indoor environment enters the indoor unit. Therefore, the reference current of the fan can be set to a larger value to increase the variation range of the fan current and delay the entry into the I-Ie. > △i, increase the total time that the indoor unit performs frost condensation at a slower condensation speed, and reduce the adverse effect of delaying frost formation caused by the heat exchange between the indoor unit and the indoor environment; conversely, in the current indoor When the temperature is lower, set the reference current of the fan to a lower value to speed up the overall process of the frost condensation stage.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

FIG. 7 is a seventh schematic flowchart of a method for controlling self-cleaning of an air conditioner of the present invention according to another exemplary embodiment.

As shown in FIG. 7 , the present invention provides another control method for air conditioner self-cleaning. The main steps of the control method include:

S701. Obtain the coil temperature and the exhaust temperature of the compressor in the frost condensation stage of the air conditioner running in the self-cleaning mode;

In this embodiment, the method for acquiring the temperature of the coil may refer to step S101 in the foregoing, which will not be repeated here.

Similarly, the air conditioner is further provided with a temperature sensor at the exhaust port or exhaust pipeline of the compressor, and the temperature sensor can be used to detect the exhaust temperature of the compressor; step S701 of the present invention is to detect the temperature sensor to obtain the compression The exhaust temperature data of the machine.

Here, the detection method of the discharge temperature of the compressor is the same as the detection method of the coil temperature.

S702 , based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, adjust the rotational speed of the fan, and determine the compensation amount of the rotational speed according to the variation of the exhaust temperature.

The air-conditioning self-cleaning control method provided by the present invention can adjust the rotation speed of the fan in the frost condensation stage based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and compensate the rotation speed of the fan according to the change of the exhaust temperature. Due to the existing fan shutdown or fixed speed operation mode, the speed of the dynamically adjusted fan can be more matched with the temperature change inside the air conditioner, so as to use the changed speed to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount. Guarantees the actual cleaning effect of the self-cleaning mode.

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

In this way, in step S702, based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the speed of the fan is adjusted, including: when the coil temperature is greater than the frost condensation critical temperature, controlling the fan to run at a set low wind speed.

For example, if the coil temperature is Toil and the critical frost condensation temperature is Te, then when Toil > Te, the fan will operate at the set low wind speed; at this time, since the coil temperature is higher than the critical frost condensation temperature, the air Although the water vapor in the indoor unit will not condense into frost, it begins to transform from gaseous state to liquid state. Running the fan at low wind speed can speed up the air flow inside the indoor unit, so that the frosted dew in the indoor unit can be evenly distributed to ensure subsequent frost condensation. The amount of frost in the process is uniform, reducing the occurrence of problems such as too thin local frost layer and insufficient frost.

Optionally, in step S702, adjusting the rotational speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, also includes: when the coil temperature is less than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is When the value is less than the preset temperature difference threshold, control the fan to reduce the speed value corresponding to the low wind speed to the first target speed value;

For example, when Toil<Te and Te-Toil<△t, the fan is reduced from the set low wind speed to the first target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation , but the difference between the two is not large, the water vapor in the air gradually condenses into frost at a slower condensation speed, and the fan runs at the first target speed value lower than the low wind speed to reduce the airflow too fast to condense the frost. It ensures that the water vapor in the air or the condensed condensed water can have sufficient condensation time to convert from gaseous or liquid to solid frost at the position currently in contact with the indoor unit components (such as indoor heat exchangers).

Optionally, the first target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Here, when Toil<Te and Te-Toil<Δt, the first compensation amount for the fan speed is also determined according to the variation of the exhaust temperature.

Specifically, the air conditioner presets a corresponding relationship between the variation of the exhaust gas temperature and the compensation amount of the fan speed. Exemplarily, when the exhaust gas temperature decreases by A°C, the compensation amount corresponding to the rotation speed for each decrease of A°C is R1; For example, when the exhaust temperature decreases by 0.5°C, the compensation amount of the rotational speed is -20 revolutions.

In this embodiment, the compensation of the fan speed is based on the first target speed as the reference speed, and the exhaust temperature is determined as the reference temperature when it is determined that Toil<Te and Te-Toil<Δt are satisfied for the first time. ; For example, when it is determined for the first time that Toil<Te and Te-Toil<△t, the exhaust gas temperature is 65°C, and the first target rotational speed value is 200r/min; then the exhaust gas temperature is repeatedly detected for several times. When the exhaust temperature detected at one time is 63°C, the compensation amount of the rotational speed can be further calculated to be -20*4=-80, and the rotational speed of the fan can be adjusted from 200r/min to 120r/min.

The above-mentioned compensation adjustment to the rotational speed of the fan of the present invention can make the rotational speed of the fan more suitable for the current frosting situation, which is beneficial to speed up the condensation speed of the frost on the indoor unit.

Optionally, in step S702, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, and further includes: when the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a preset temperature difference threshold, controlling the speed of the fan. The fan is reduced from the rotational speed value corresponding to the low wind gear to the second target rotational speed value.

For example, in the case of Te-Toil>△t, the fan is reduced from the set low wind speed to the second target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, and the difference between the two is The difference between the two is large, the water vapor in the air gradually condenses into frost at a faster condensation speed, and the fan runs at the second target speed value lower than the low wind speed, which can reduce the power consumption of its operation, and use the heat in the indoor unit. The transmission between the solid components realizes the further condensation of the frost and ensures the frost condensation effect.

Here, the second target rotational speed value is smaller than the first target rotational speed value; when the first target rotational speed value is a wind speed value between the low wind gear position and the breeze gear position, the second target rotational speed value may be a value corresponding to the breeze gear position The rotational speed value; alternatively, the target rotational speed value may be a rotational speed value between the low wind gear and the light wind gear. When the first target rotational speed value is a rotational speed value corresponding to the breeze gear, the second target rotational speed value is a rotational speed value lower than the rotational speed value corresponding to the breeze gear.

If a comparison result is obtained that the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, the fan is at the first target rotational speed value, then step S702 in this embodiment is to control the blower from the first target rotational speed value Reduce to the second target speed value.

Here, in the case of Te-Toil>Δt, the second compensation amount for the rotational speed of the fan is also determined according to the variation of the exhaust gas temperature.

Specifically, the air conditioner presets a corresponding relationship between the variation of the exhaust gas temperature and the compensation amount of the fan speed. Exemplarily, when the exhaust temperature decreases by B°C, the compensation amount corresponding to the rotation speed for each decrease of B°C is R2; For example, when the exhaust gas temperature decreases by 0.5°C, the compensation amount of the rotational speed is -10 revolutions.

In this embodiment, the compensation of the fan speed is based on the second target speed as the reference speed, and the exhaust temperature is determined as the reference temperature when it is determined that Te-Toil>Δt is satisfied for the first time; It is determined that when Te-Toil>△t is satisfied, the exhaust gas temperature is 70°C, and the second target rotational speed value is 150r/min; then the exhaust gas temperature is repeatedly detected several times, and the exhaust gas temperature detected at one time is 68.5°C , the compensation amount of the rotational speed can be further calculated to be -20*3=-60, then the rotational speed of the fan can be adjusted from 150r/min to 90r/min.

Here, the second compensation amount of the rotational speed is associated with the variation of the exhaust gas temperature; the second target rotational speed value is smaller than the first target rotational speed value, and the second compensation amount is smaller than the first compensation amount.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining a preset temperature difference threshold based on the current indoor temperature and a preset rule; wherein the preset rule It is used to characterize the corresponding relationship between the current indoor temperature and the temperature difference threshold.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the temperature difference threshold. In the corresponding relationship, the current indoor temperature and the temperature difference threshold are positively correlated; when the current indoor temperature is higher, because the air conditioner is executing the self-cleaning process There is still heat exchange with the indoor environment, and the heat in the indoor environment enters the interior of the indoor unit. Therefore, it is necessary to increase the temperature range for the indoor unit to perform frost condensation at a slower condensation speed. Therefore, the temperature difference threshold can be set to a larger value; on the contrary, when the current indoor temperature is smaller, the Set the temperature difference threshold to a small value to speed up the overall progression of the frosting phase.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

FIG. 8 is a schematic flow chart 8 of a method for controlling self-cleaning of an air conditioner of the present invention according to another exemplary embodiment.

As shown in FIG. 8 , the present invention provides another control method for air conditioner self-cleaning. The main steps of the control method include:

S801. Obtain the coil temperature and the fan current in the frost condensation stage of the air conditioner running in the self-cleaning mode;

In this embodiment, the method for acquiring the temperature of the coil may refer to step S101 in the foregoing, which will not be repeated here.

In this embodiment, for the acquisition method of the fan current, reference may be made to step S501 in the foregoing, which will not be repeated here.

S802 , adjusting the rotation speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature; and determining the compensation amount of the rotation speed according to the variation of the fan current.

The air conditioner self-cleaning control method provided by the present invention can adjust the rotation speed of the fan in the frost condensation stage based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, which is different from the existing fan shutdown or fixed The rotating speed of the dynamically adjusted fan can better match the temperature change inside the air conditioner, so as to use the changing rotating speed to speed up the frost condensation rate in the frost condensation stage and increase the actual frost condensation amount, thereby ensuring the actual cleaning effect of the self-cleaning mode. .

In this embodiment, the fan has at least two wind gears whose rotational speed increases sequentially; here, the wind gear is a wind speed range pre-set by the air conditioner for the indoor fan; for example, the indoor fan has a low wind gear and a light wind The wind speed of the windshield is greater than the wind speed of the breeze windshield.

In this way, in step S802, based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the speed of the fan is adjusted, including: when the coil temperature is greater than the frost condensation critical temperature, controlling the fan to run at a set low wind speed.

For example, if the coil temperature is Toil and the critical frost condensation temperature is Te, then when Toil > Te, the fan will operate at the set low wind speed; at this time, since the coil temperature is higher than the critical frost condensation temperature, the air Although the water vapor in the indoor unit will not condense into frost, it begins to transform from gaseous state to liquid state. Running the fan at low wind speed can speed up the air flow inside the indoor unit, so that the dew condensation in the indoor unit can be evenly distributed to ensure subsequent frost condensation. The amount of frost in the process is uniform, reducing the occurrence of problems such as too thin local frost layer and insufficient frost.

Optionally, in step S802, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, which also includes: when the coil temperature is lower than the frost condensation critical temperature and the frost condensation critical temperature. When the temperature difference with the coil temperature is less than the preset temperature difference threshold and the variation of the coil temperature is less than the preset variation threshold, control the fan to reduce the rotation speed value corresponding to the low wind speed to the first target rotation speed value;

For example, when Toil<Te, Te-Toil<△t, and △Toil (change in coil temperature)<△T (change threshold), the fan is lowered from the set low wind speed to the first A target speed value; at this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, but the difference between the two is not large, and the change of the coil temperature is less than the preset change threshold, the air The water vapor gradually condenses into frost at a slow condensation speed, and the fan runs at the first target speed value lower than the low wind speed to reduce the adverse effect of the excessively fast airflow on the frost condensation, and to ensure that the water vapor in the air or the condensed water that has condensed There may be sufficient condensation time to convert from gaseous or liquid to solid frost at the location currently in contact with indoor unit components (eg, indoor heat exchangers).

Optionally, the first target rotational speed value may be a rotational speed value corresponding to the breeze gear; or, the target rotational speed value may be a rotational speed value between the low wind gear and the breeze gear.

Here, when Toil<Te, Te-Toil<△t and △Toil (change of coil temperature)<△T (change threshold), it is also determined according to the change of fan current (△i) The first compensation amount for the fan speed.

Specifically, the air conditioner presets a corresponding relationship between the variation of the fan current and the compensation amount of the fan speed. Exemplarily, when the fan current decreases by A, the compensation amount corresponding to the speed of each decrease by A is R1; for example, when the fan When the current decreases by 0.5mA, the compensation amount of the speed is -20 rpm.

In this embodiment, the compensation of the fan speed is based on the first target speed as the reference speed, and the fan current is based on the current value of the fan current when it is determined that Toil<Te and Te-Toil<Δt are satisfied for the first time. ; For example, when it is first determined that Toil<Te and Te-Toil<△t, the fan current is 20mA, and the first target speed value is 200r/min; When the current of the fan is 18mA, the compensation amount of the rotating speed can be further calculated to be -20*4=-80, and the rotating speed of the fan can be adjusted from 200r/min to 120r/min.

The above-mentioned compensation adjustment to the rotational speed of the fan of the present invention can make the rotational speed of the fan more suitable for the current frosting situation, which is beneficial to speed up the condensation speed of the frost on the indoor unit.

Optionally, in step S802, the rotational speed of the fan is adjusted based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, and further includes: when the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a predetermined temperature. When the set temperature difference threshold is set, and the variation of the coil temperature is greater than the preset variation threshold, control the fan to reduce the rotational speed value corresponding to the low wind speed to the second target rotational speed value;

For example, when Te-Toil>△t, and △Toil (change in coil temperature)>△T (change threshold), the fan is reduced from the set low wind speed to the second target speed value ; At this time, since the temperature of the inner coil is lower than the critical temperature of frost condensation, the difference between the two is large, and the change of the coil temperature is greater than the preset change threshold, then the water vapor in the air will increase rapidly. The condensation speed gradually condenses into frost, and the fan runs at the second target speed value lower than the low wind gear to reduce the power consumption of its operation, and utilizes the heat transfer between the various solid components of the indoor unit to further condense the frost and ensure condensation. Cream effect.

Here, the second target rotational speed value is smaller than the first target rotational speed value; when the first target rotational speed value is a wind speed value between the low wind gear position and the breeze gear position, the second target rotational speed value may be a value corresponding to the breeze gear position The rotational speed value; alternatively, the target rotational speed value may be a rotational speed value between the low wind gear and the light wind gear. When the first target rotational speed value is a rotational speed value corresponding to the breeze gear, the second target rotational speed value is a rotational speed value lower than the rotational speed value corresponding to the breeze gear.

If a comparison result is obtained that the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, the fan is at the first target rotational speed value, then step S802 in this embodiment is to control the blower from the first target rotational speed value Reduce to the second target speed value.

Here, in the case of Te-Toil>Δt and ΔToil>ΔT, the second compensation amount for the fan speed is also determined according to the variation of the fan current.

Specifically, the air conditioner presets a corresponding relationship between the variation of the fan current and the compensation amount of the fan speed. Exemplarily, when the fan current decreases by B, the compensation amount corresponding to each decrease in the speed of B is R2; for example, when the fan When the current decreases by 1mA, the compensation amount of the rotational speed is -10 revolutions.

In this embodiment, the compensation of the speed of the fan is based on the second target speed as the reference speed, and the current of the fan is the current of the fan when it is first determined that Te-Toil>Δt is the reference current; When Te-Toil>△t, the fan current is 15mA, and the second target speed value is 150r/min; then the coil temperature is repeatedly detected for many times, and when the fan current detected at a certain time is 13mA, it can be further calculated Determine the compensation amount of the speed to be -20*2=-40, then adjust the speed of the fan from 150r/min to 110r/min.

Here, the second compensation amount of the rotational speed is associated with the variation of the fan current; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

Optionally, the control method of the present invention further includes: acquiring the current indoor temperature in the frost condensation stage of the self-cleaning mode of the air conditioner; determining a preset temperature difference threshold based on the current indoor temperature and a preset rule; wherein the preset rule It is used to characterize the corresponding relationship between the current indoor temperature and the temperature difference threshold.

For example, the preset rule is the corresponding relationship between the current indoor temperature and the temperature difference threshold. In the corresponding relationship, the current indoor temperature and the temperature difference threshold are positively correlated; when the current indoor temperature is higher, because the air conditioner is executing the self-cleaning process There is still heat exchange with the indoor environment, and the heat in the indoor environment enters the interior of the indoor unit. Therefore, it is necessary to increase the temperature range for the indoor unit to perform frost condensation at a slower condensation speed. Therefore, the temperature difference threshold can be set to a larger value; on the contrary, when the current indoor temperature is smaller, the Set the temperature difference threshold to a small value to speed up the overall progression of the frosting phase.

Here, after the frost condensation stage of the air conditioner self-cleaning mode is completed, it can be switched to the defrosting stage to continue; the control flow of the defrosting stage of the present invention can be referred to the above description, and will not be repeated here.

In an optional embodiment, the air-conditioning clothing mainly includes a body and a controller, and the controller can be used to control the control process disclosed in the embodiment of FIG. 1 above.

Specifically, the controller is used to:

Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Adjust the fan speed based on the temperature comparison between the coil temperature and the frost critical temperature.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the coil temperature is lower than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is less than the preset temperature difference threshold, control the fan to reduce the speed value corresponding to the low wind speed to the target speed value.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional implementation manner, the controller is specifically used for:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, the fan is controlled to run at the set low wind speed.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

In yet another optional embodiment, the controller of the air-conditioning garment can be used to control the control process disclosed in the embodiment of FIG. 2 above.

Specifically, the controller is used to:

Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the rotational speed of the fan is adjusted; wherein, the rotational speed adjustment rate is determined according to the temperature comparison result.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the coil temperature is less than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is less than the preset temperature difference threshold, control the fan to reduce the rotational speed value corresponding to the low wind speed to the first target rotational speed value;

Wherein, the fan is reduced from the rotational speed value corresponding to the low wind speed to the first target rotational speed value at a first adjustment rate.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional implementation manner, the controller is specifically used for:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, control the fan to reduce the rotational speed value corresponding to the low wind speed to the second target rotational speed value;

Wherein, the fan is reduced from the rotation speed value corresponding to the low wind speed to the second target rotation speed value at a second adjustment rate; the second target rotation speed is smaller than the first target rotation speed, and the first adjustment rate is greater than the second adjustment rate.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

In yet another optional embodiment, the controller of the air-conditioning garment can be used to control the control process disclosed in the embodiment of FIG. 3 above.

Specifically, the controller is used to:

Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the speed of the fan is adjusted; and the compensation amount of the speed is determined according to the change of the coil temperature.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the coil temperature is less than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is less than the preset temperature difference threshold, control the fan to reduce the rotational speed value corresponding to the low wind speed to the first target rotational speed value;

The first compensation amount of rotational speed is associated with the amount of change in coil temperature.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional implementation manner, the controller is specifically used for:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, control the fan to reduce the rotational speed value corresponding to the low wind speed to the second target rotational speed value;

The second compensation amount of the rotational speed is associated with the variation of the coil temperature; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

In yet another optional embodiment, the controller of the air conditioner may be used to control the control process disclosed in the embodiment of FIG. 4 above.

Specifically, the controller is used to:

Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the temperature comparison result of the coil temperature and the critical frost condensation temperature and the variation of the coil temperature, the speed of the fan is adjusted; and the compensation amount of the rotation speed is determined according to the variation of the coil temperature.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the coil temperature is less than the frost condensation critical temperature, the temperature difference between the frost condensation critical temperature and the coil temperature is less than the preset temperature difference threshold, and the variation of the coil temperature is less than the preset variation threshold, the fan is controlled from low wind to wind. The speed value corresponding to the gear is reduced to the first target speed value;

The first compensation amount of rotational speed is associated with the amount of change in coil temperature.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional implementation manner, the controller is specifically used for:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, and the variation of the coil temperature is greater than the preset variation threshold, control the fan to reduce the speed value corresponding to the low wind speed to the second target speed value;

The second compensation amount of the rotational speed is associated with the variation of the coil temperature; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

In yet another optional embodiment, the controller of the air-conditioning garment can be used to control the control process disclosed in the embodiment of FIG. 5 above.

Specifically, the controller is used to:

Obtain the fan current in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the comparison result of the fan current and the fan reference current, the speed of the fan is adjusted.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the fan current is equal to the fan base current, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the fan current is greater than the fan base current, control the fan to reduce the speed value corresponding to the low wind speed to the target speed value.

In an optional implementation manner, the controller is specifically used for:

When the current difference between the fan current and the fan reference current is greater than the current difference threshold, the fan is controlled to run at the set low wind speed.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, the fan reference current is determined; wherein, the preset rule is used to represent the corresponding relationship between the current indoor temperature and the fan base current.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

In yet another optional embodiment, the controller of the air-conditioning garment can be used to control the control process disclosed in the embodiment of FIG. 6 above.

Specifically, the controller is used to:

Obtain the fan current in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the comparison result between the fan current and the fan reference current, the speed of the fan is adjusted; wherein, the speed of the speed adjustment is determined according to the rate of change of the fan current.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the fan current is equal to the fan base current, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the fan current is greater than the fan reference current, control the fan to reduce the speed value corresponding to the low wind speed to the first target speed value;

Wherein, the fan is reduced from the rotational speed value corresponding to the low wind gear to the first target rotational speed value at a first adjustment rate; the first adjustment rate is associated with the rate of change of the current of the blower.

In an optional implementation manner, adjusting the rotational speed of the fan based on the comparison result between the fan current and the fan reference current, further comprising:

When the current difference between the fan current and the fan reference current is greater than the current difference threshold, control the fan to reduce the speed value corresponding to the low wind speed to the second target speed value;

Wherein, the fan is reduced from the rotational speed value corresponding to the low wind gear to the second target rotational speed value at the second adjustment rate; the second adjustment rate is associated with the change rate of the coil temperature; the second target rotational speed is smaller than the first target rotational speed, and the third The second adjustment rate is less than the second adjustment rate.

In an optional embodiment, the control method further includes:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, the fan reference current is determined; wherein, the preset rule is used to represent the corresponding relationship between the current indoor temperature and the fan base current.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

In yet another optional embodiment, the controller of the air-conditioning garment can be used to control the control process disclosed in the embodiment of FIG. 7 above.

Specifically, the controller is used to:

Obtain the coil temperature and the discharge temperature of the compressor in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the temperature comparison result between the coil temperature and the frost condensation critical temperature, the speed of the fan is adjusted; and the compensation amount of the speed is determined according to the variation of the exhaust temperature.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the coil temperature is less than the frost condensation critical temperature, and the temperature difference between the frost condensation critical temperature and the coil temperature is less than the preset temperature difference threshold, control the fan to reduce the rotational speed value corresponding to the low wind speed to the first target rotational speed value;

The first compensation amount of the rotational speed is associated with the change amount of the exhaust gas temperature.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional implementation manner, the controller is specifically used for:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, control the fan to reduce the speed value corresponding to the low wind speed to the second target speed value;

The second compensation amount of the rotational speed is associated with the variation of the exhaust gas temperature; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

In yet another optional embodiment, the controller of the air-conditioning garment can be used to control the control process disclosed in the embodiment of FIG. 8 above.

Specifically, the controller is used to:

Obtain the coil temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the temperature comparison result of the coil temperature and the critical frost temperature and the variation of the coil temperature, the speed of the fan is adjusted; and the compensation amount of the rotation speed is determined according to the variation of the coil temperature.

In an optional embodiment, the fan has at least two wind gears whose rotational speed increases in sequence;

The controller is specifically used for:

When the coil temperature is greater than the critical temperature of frost condensation, control the fan to run at the set low wind speed.

In an optional implementation manner, the controller is specifically used for:

When the coil temperature is less than the critical temperature of frost condensation, the temperature difference between the critical temperature of frost condensation and the coil temperature is less than the preset temperature difference threshold, and the variation of the coil temperature is less than the preset variation threshold, control the fan from low wind to wind. The speed value corresponding to the gear is reduced to the first target speed value;

The first compensation amount of the rotational speed is associated with the change amount of the fan current.

In an optional embodiment, the controller is also used to:

Obtain the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode;

Based on the current indoor temperature and a preset rule, a preset temperature difference threshold is determined; wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold.

In an optional implementation manner, the controller is specifically used for:

When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than the preset temperature difference threshold, and the variation of the coil temperature is greater than the preset variation threshold, control the fan to reduce the speed value corresponding to the low wind speed to the second target speed value;

The second compensation amount of the rotational speed is associated with the variation of the fan current; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

The specific manner in which the controller controls the execution of the above process may refer to the foregoing embodiments, which will not be repeated here.

It should be understood that the present invention is not limited to the processes and structures that have been described above and shown in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims (10)

1. A control method for air-conditioning self-cleaning, wherein the control method comprises: Obtain the coil temperature and the fan current in the frost condensation stage of the air conditioner running in the self-cleaning mode; Based on the temperature comparison result between the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, the rotation speed of the fan is adjusted; and the compensation amount of the rotation speed is determined according to the variation of the fan current. 2 . The control method according to claim 1 , wherein the fan has at least two wind gears whose rotational speed increases sequentially; 2 . The adjustment of the rotational speed of the fan based on the temperature comparison result between the coil temperature and the frost condensation critical temperature includes: When the temperature of the coil is greater than the critical temperature of frost condensation, the fan is controlled to operate at a set low wind speed. 3. The control method according to claim 2, wherein, adjusting the rotational speed of the fan based on the temperature comparison result of the coil temperature and the frost condensation critical temperature, further comprising: When the coil temperature is less than the frost condensation threshold temperature, the temperature difference between the frost condensation threshold temperature and the coil temperature is less than a preset temperature difference threshold and the change in the coil temperature is less than a preset change When the threshold value is reached, control the fan to decrease from the rotational speed value corresponding to the low wind speed to the first target rotational speed value; The first compensation amount of the rotational speed is associated with the change amount of the fan current. 4. The control method according to claim 3, wherein the control method further comprises: obtaining the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode; The preset temperature difference threshold is determined based on the current indoor temperature and a preset rule, wherein the preset rule is used to represent the corresponding relationship between the current indoor temperature and the temperature difference threshold. 5. The control method according to claim 3, wherein, adjusting the rotational speed of the fan based on the temperature comparison result of the coil temperature and the frost condensation critical temperature, further comprising: When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a preset temperature difference threshold, and the variation of the coil temperature is greater than a preset variation threshold, the fan is controlled from the low wind The rotational speed value corresponding to the wind gear is reduced to the second target rotational speed value; The second compensation amount of the rotational speed is associated with the variation of the fan current; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount. 6. An air conditioner, characterized in that the air conditioner comprises a body and a controller, wherein the controller is used for: obtaining the coil temperature in the frost condensation stage of the air conditioner operating in the self-cleaning mode; Based on the temperature comparison result of the coil temperature and the frost condensation critical temperature and the variation of the coil temperature, the rotation speed of the fan is adjusted; and the compensation amount of the rotation speed is determined according to the variation of the coil temperature. 7. The air conditioner according to claim 6, wherein the fan has at least two windshields whose rotational speed increases in sequence; The controller is specifically used for: When the temperature of the coil is greater than the critical temperature of frost condensation, the fan is controlled to operate at a set low wind speed. 8. The air conditioner according to claim 7, wherein the controller is specifically used for: When the coil temperature is less than the frost condensation critical temperature, the temperature difference between the frost condensation critical temperature and the coil temperature is less than a preset temperature difference threshold, and the change in the coil temperature is less than a preset change When the amount threshold is reached, controlling the fan to decrease from the rotational speed value corresponding to the low wind speed to the first target rotational speed value; The first compensation amount of the rotational speed is associated with the change amount of the fan current. 9. The air conditioner according to claim 8, wherein the controller is further used for: obtaining the current indoor temperature in the frost condensation stage of the air conditioner running in the self-cleaning mode; The preset temperature difference threshold is determined based on the current indoor temperature and a preset rule; wherein the preset rule is used to characterize the corresponding relationship between the current indoor temperature and the temperature difference threshold. 10. The air conditioner according to claim 8, wherein the controller is specifically used for: When the temperature difference between the frost condensation critical temperature and the coil temperature is greater than a preset temperature difference threshold, and the variation of the coil temperature is greater than a preset variation threshold, the fan is controlled from the low wind The rotational speed value corresponding to the wind gear is reduced to the second target rotational speed value; The second compensation amount of the rotational speed is associated with the variation of the fan current; the second target rotational speed is smaller than the first target rotational speed, and the second compensation amount is smaller than the first compensation amount.

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