CN111189166B - An air conditioner and a control method for preventing freezing - Google Patents

Abstract

The invention discloses an air conditioner and an anti-freezing control method thereof, belonging to the technical field of air conditioners. The control method includes: in response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, acquiring the first working current of the indoor fan, the first inlet air temperature, the first outlet air temperature and the inner disk of the indoor unit when the air conditioner operates in a current working mode Tube temperature; according to the first working current of the indoor fan, the first inlet air temperature of the indoor unit, the first outlet air temperature, the inner coil temperature and the preset freezing temperature threshold, determine whether the air conditioner has a freezing problem. The air conditioner and the anti-freezing control method thereof provided by the present invention can judge the freezing state of the air conditioner according to the working current of the internal fan of the air conditioner, the air inlet temperature, the air outlet temperature and the temperature of the inner coil, and can determine the freezing state of the air conditioner when it can be determined that the air conditioner freezes. When there is a problem, the air conditioner is timely controlled to perform anti-freezing protection on the indoor heat exchanger; the anti-freezing control method can make the air conditioner more timely and sensitive to trigger its own anti-freezing protection.

Description

An air conditioner and a control method for preventing freezing thereof

technical field

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

Background technique

When the air conditioner is in cooling or dehumidifying operation, due to the temperature angle of the refrigerant entering the indoor heat exchanger of the indoor unit, the outer surface of the indoor heat exchanger is always in a low temperature state. When the indoor air flows through the indoor heat exchanger, The water vapor in the air is easily condensed into dew or even frost on the indoor heat exchanger, which causes the indoor heat exchanger of the indoor unit to freeze, which in turn affects the cooling effect of the air conditioner, making its cooling or dehumidification capacity weaker and weaker.

Aiming at the freezing phenomenon of the indoor heat exchanger of the air conditioner, the main anti-freezing implementation of the existing air conditioner is to use the temperature sensor installed on the coil of the indoor heat exchanger to detect the temperature of the coil, so that the air conditioner can pass the temperature of the indoor unit. The coil temperature is used to judge whether the indoor heat exchanger is frozen, so that when the indoor unit coil is frozen, the air conditioner can deal with the freezing in time. However, the existing air conditioners generally only set a single temperature sensor in the middle of the indoor heat exchanger of the indoor unit of the air conditioner, and judge whether there is a freezing problem only by the value of the single temperature parameter detected by the temperature sensor. It is a plurality of branch pipe flow paths that flow through the indoor heat exchanger. Therefore, when the branch pipe flow path position in the non-central position is frozen, the temperature sensor set in the central position is often insensitive to its low temperature sensing, which is It is easy to cause the overall freezing problem of the indoor heat exchanger of the air conditioner to be easily detected by the temperature sensor, so it cannot meet the requirements of the air conditioner to trigger its own anti-freezing protection in a timely and sensitive manner.

SUMMARY OF THE INVENTION

The invention provides an air conditioner and an anti-freezing method thereof, aiming at solving the disadvantage of insensitive triggering of anti-freezing protection caused by the use of a single temperature sensor to sense the temperature of the coil in the existing air conditioner. 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 preventing freezing of an air conditioner, the control method comprising:

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode;

According to the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature of the indoor unit, the temperature of the inner coil, and the preset freezing temperature threshold, it is determined whether the air conditioner has a freezing problem.

In an optional implementation manner, according to the first working current of the indoor fan, the first inlet air temperature and the first outlet air temperature of the indoor unit, it is determined whether the air conditioner has a freezing problem, including:

If the ratio of the first working current of the indoor fan to the preset reference current is smaller than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and If the temperature difference between the inner coil temperature and the preset freezing temperature threshold is greater than the preset second temperature difference threshold, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

In an optional embodiment, the control method further includes:

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freeze mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio; or, increasing the opening degree of the throttling device.

In an optional embodiment, the control method further includes:

After the air conditioner performs the anti-freezing operation for a set period of time, obtain the second working current of the indoor fan, the second inlet air temperature and the second outlet air temperature of the indoor unit when the air conditioner operates in the current working mode;

If the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset third temperature difference threshold, control the air conditioner to exit the anti-freeze mode;

The third temperature difference threshold is smaller than the first temperature difference threshold.

In an optional implementation manner, after responding to the trigger signal, the first working current of the indoor fan, the first inlet air temperature, the first outlet air temperature and the inner coil temperature of the indoor unit when the air conditioner is running in the current working mode are acquired Previously, control methods also included:

Control to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

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

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode;

According to the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature of the indoor unit, the temperature of the inner coil, and the preset freezing temperature threshold, it is determined whether the air conditioner has a freezing problem.

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

If the ratio of the first working current of the indoor fan to the preset reference current is smaller than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and If the temperature difference between the inner coil temperature and the preset freezing temperature threshold is greater than the preset second temperature difference threshold, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

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

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freeze mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio; or, increasing the opening degree of the throttling device.

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

After the air conditioner performs the anti-freezing operation for a set period of time, obtain the second working current of the indoor fan, the second inlet air temperature and the second outlet air temperature of the indoor unit when the air conditioner operates in the current working mode;

If the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset third temperature difference threshold, control the air conditioner to exit the anti-freeze mode;

The third temperature difference threshold is smaller than the first temperature difference threshold.

In an optional implementation manner, the controller is further configured to: after responding to the trigger signal, obtain the first working current of the indoor fan, the first air inlet temperature of the indoor unit, the first air outlet when the air conditioner operates in the current working mode Before the temperature and the temperature of the inner coil, the control switches the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

The air conditioner and the anti-freezing control method thereof provided by the present invention can judge the freezing state of the air conditioner according to the working current of the internal fan of the air conditioner, the air inlet temperature, the air outlet temperature and the temperature of the inner coil, and can determine the freezing state of the air conditioner when it can be determined that the air conditioner freezes. When there is a problem, the air conditioner can be controlled in time to protect the indoor heat exchanger from freezing; the anti-freezing control method can make the air conditioner more timely and sensitive to trigger its own anti-freezing protection, and ensure the safe and stable operation of the air conditioner.

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

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

FIG. 1 is a schematic flowchart of a control method for anti-freezing of an air conditioner according to an exemplary embodiment of the present invention;

FIG. 2 is a schematic flowchart of a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention;

3 is a schematic flowchart of a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention;

4 is a schematic flowchart of a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention;

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

FIG. 6 is a schematic flowchart of a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention;

FIG. 7 is a schematic flowchart of a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention;

8 is a schematic flowchart of a control method for anti-freezing of an air conditioner of the present invention according to another exemplary embodiment;

FIG. 9 is a schematic flowchart of a control method for anti-freezing of an air conditioner according to the present invention, according to yet 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.

FIG. 1 is a control method for preventing freezing 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 anti-freezing of an air conditioner, which can be used to solve the problem of freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode, thereby affecting the output of the air conditioner. The problem of wind and heat exchange efficiency; the following mainly uses the anti-freezing protection in the cooling mode as an example, but it should be understood that other working modes of the air conditioner that may cause the freezing problem of the indoor heat exchanger can also be applied. A control method for anti-freezing; specifically, the main process steps of the method include:

S101. Acquire the inlet air temperature, outlet air temperature and inner coil temperature of the indoor unit when the air conditioner operates in the cooling mode;

As an optional embodiment, the air inlet and the air outlet of the indoor unit of the air conditioner are respectively provided with a temperature sensor, which can be respectively used to detect the real-time air inlet temperature of the air inlet of the indoor unit and the real-time air outlet temperature of the air outlet; step S101 is to use the temperature data detected by the above two sensors as the inlet air temperature and the outlet air temperature;

At the same time, a temperature sensor is provided at the coil position of the indoor heat exchanger of the air conditioner, and the temperature sensor can be used to detect the real-time temperature of the coil position; in step S101, the real-time temperature of the coil position detected by the temperature sensor is used as the current control process. the inner coil temperature.

S102. Calculate the temperature difference between the inlet air temperature and the outlet air temperature;

Here, take the absolute value of the temperature difference between the inlet air temperature and the outlet air temperature;

S103. In response to the temperature difference between the inlet air temperature and the outlet air temperature being greater than a preset difference threshold and the inner coil temperature being less than the preset temperature threshold, determine that the indoor heat exchanger of the air conditioner has a freezing problem.

Here, the preset difference threshold and temperature threshold are preset threshold parameters of the air conditioner, which are used to indicate whether the indoor unit of the air conditioner has a freezing problem; if the temperature difference between the air temperature and the outlet air temperature is greater than the preset difference Threshold value, and the temperature of the inner coil is lower than the preset temperature threshold, indicating that the temperature of the inner coil drops faster at this time, and then it can be judged that the indoor unit freezes more and the freezing rate is also faster. At this time, the air conditioner needs to If not, it means that the temperature of the inner coil drops at a slower rate at this time, and it can be judged that the amount of freezing of the indoor unit is small and the freezing rate is also slower. At this time, the air conditioner does not need to prevent the indoor unit from freezing temporarily. deal with.

Optionally, the difference threshold value is 10°C; the temperature threshold value is 5°C.

Therefore, in step S103, by comparing the magnitude of the temperature difference with the difference threshold, as well as the inner coil temperature and the temperature threshold, the control will determine the current freezing condition of the indoor unit, thereby further determining whether the air conditioner needs to be switched to the anti-freezing mode. .

Optionally, the control method for anti-freezing of an air conditioner of the present invention further includes: in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode.

Specifically, the anti-freeze mode switched by the air conditioner includes: sequentially executing a plurality of cyclic processes defining anti-freezing operations, and the cyclic process sequentially includes one or more first cyclic processes in which the anti-freezing operation is defined as increasing the opening degree of the throttle device , one or more anti-freeze operations are defined as a second cycle process for reducing the frequency of the compressor, and one or more anti-freeze operations are defined as a third cycle process for controlling air conditioner shutdown;

Here, each cycle process has a set cycle duration; optionally, the cycle durations of multiple cycle processes are sequentially decreased.

Exemplarily, when the temperature change rate of the inner coil temperature is greater than the set rate threshold, the air conditioner performs the anti-freezing operation defined in the first cycle process, that is, in the first cycle process, the throttle device is increased to the setting value. Set the opening value, and keep the throttling device at the set opening value for the first cycle duration of 30 minutes; the first cycle process can be executed only once, or it can be executed multiple times in a row; after that, the air conditioner executes the second cycle process The limited anti-freeze operation, that is, in the second cycle process, reduce the frequency value of the compressor to set the frequency value, and make the compressor maintain the set frequency value for the set time length of 10min, and the set time length is Duration of the second cycle; the second cycle process can be executed only once, or continuously executed multiple times; after that, the air conditioner executes the anti-freezing operation defined by the third cycle process, that is, in the third cycle process, the air conditioner is controlled to stop, and the The shutdown duration for stopping the air conditioner is the set duration of 2 minutes, and the set duration is the third cycle duration.

Here, after the execution of each cycle process is completed, it is re-determined whether the indoor heat exchanger of the air conditioner has a freezing problem; that is, steps S101 to S103 are executed again after the execution of each cycle process. If there is no freezing problem in the air conditioner, exit the anti-freezing mode. At this time, the air conditioner switches back to the original working mode, such as cooling mode; if the indoor heat exchanger of the re-determined air conditioner still has a freezing problem, the anti-freezing mode will continue to be executed in the original order. model.

Here, in the second cycle process of the anti-freeze mode, the frequency of the compressor of the air conditioner can be reduced by a set frequency reduction range, so as to ensure that the frequency reduction range of the compressor can be adapted to the current demand for anti-freeze protection. At the same time, the original frequency can also be quickly restored after the air conditioner ends the anti-freezing mode; the control method for anti-freezing of the air conditioner according to the present invention further comprises: acquiring the decay speed of the temperature of the inner coil and the temperature of the inner coil, and according to the preset correlation relationship The corresponding frequency reduction amplitude of the compressor in the second cycle process is obtained by matching, and the correlation is used to characterize the decay speed of the inner coil temperature and the corresponding relationship between the inner coil temperature and the frequency reduction amplitude. .

For example, the air conditioner has pre-stored a corresponding relationship between the decay speed of the inner coil temperature, the inner coil temperature and the frequency reduction amplitude, and the relationship can be measured through experiments before the air conditioner leaves the factory. Before the air conditioner leaves the factory, it is possible to calculate the defrosting and ice melting of the indoor heat exchanger after the compressor is frequency-reduced by different amplitudes under the conditions of different inner coil temperature decay rates and inner coil temperatures by means of simulation experiments. and the length of time for the compressor to return to the original frequency; and based on the measured experimental data to establish the attenuation speed of the inner coil temperature, the temperature of the inner coil, and the best defrosting and ice melting and the compressor recovery time The shortest frequency reduction amplitude is established Correspondence between.

Exemplarily, the relationship between the two may include: when the decay rate of the inner coil temperature is 1.5°C/6min and the inner coil temperature is less than 7°C, the frequency reduction range of the compressor is 20 Hz; When the temperature decay rate is 1.2°C/6min and the inner coil temperature is less than 7°C, the frequency reduction range of the compressor is 15Hz; when the inner coil temperature decay rate is 1°C/6min and the inner coil temperature is less than 7°C , the frequency reduction amplitude of the compressor is 10 Hz; here, in the pre-stored correspondence, the decay rate of the inner coil temperature in the correlation relationship is positively correlated with the frequency reduction amplitude.

Optionally, the anti-freezing mode switched by the air conditioner may also include controlling the air conditioner to switch to the heating mode to operate; here, when the air conditioner switches to the heating mode to operate, the high-temperature refrigerant discharged from the compressor of the air conditioner first flows into the indoor heat exchanger, which can The heat of the refrigerant itself is used to increase the surface temperature of the indoor heat exchanger, so that the frozen frost on the outer surface of the outdoor heat exchanger is melted, thereby achieving the purpose of preventing freezing of the air conditioner.

Here, the air conditioner operates for the set period of time when it switches to the heating mode. Optionally, the specific duration of the set duration is determined according to the temperature of the inner coil detected in step S101. Here, the specific duration of the set duration is in a negative correlation with the coil temperature, that is, the lower the coil temperature, the lower the coil temperature. The more serious the freezing problem of the air conditioner is, the longer the specific duration of the set time will be, so as to ensure that the air conditioner has enough time to defrost and thaw the indoor heat exchanger; and the higher the coil temperature, the greater the freezing problem of the air conditioner. Lighter, the shorter the specific duration of the set duration.

Alternatively, the air conditioner can also use other anti-freezing modes in the prior art to perform anti-freezing protection on the indoor heat exchanger of the air conditioner.

In this embodiment, the operation modes of the air conditioner include modes such as cooling mode and heating mode. In the cooling mode, the low-temperature refrigerant flows into the indoor heat exchanger. If the refrigerant temperature is too low or the refrigerant flow is too large, the indoor heat exchanger may freeze. In the heating mode, the refrigerant flowing into the indoor heat exchanger may freeze. It is a high-temperature refrigerant. If the temperature of the refrigerant is too high and the refrigerant flow is too large, the overall heat load of the air conditioner may be higher, which affects the safe operation of the air conditioner.

Here, in the prior art, the determination of anti-freezing and the determination of thermal load protection of the air conditioner has high accuracy by using the temperature of the refrigerant when it flows into the indoor heat exchanger as a reference parameter. In the control flow of the present invention, the present invention can also utilize the temperature of the inner coil detected by the temperature sensor installed on the air conditioner to perform load protection. Therefore, the above process of the present invention can not only perform the anti-freezing protection judgment operation on the indoor heat exchanger according to the coil temperature; at the same time, for the heat load protection operation in the heating mode, it can also be realized according to the inner coil temperature, instead of It needs to be limited to relying on the temperature parameters detected by the sensor installed in the high-temperature refrigerant inflow nozzle of the indoor heat exchanger to achieve accurate judgment of thermal load protection.

Specifically, for the load protection problem in the heating mode, the control method of the present invention further includes: when the current working mode of the air conditioner is the heating mode, acquiring the exhaust gas temperature of the compressor and the inner coil of the indoor heat exchanger temperature; according to the exhaust temperature of the compressor and the inner coil temperature of the indoor heat exchanger, determine the temperature in the middle of the cold; according to the temperature in the middle of the cold, the load protection operation of the air conditioner is performed.

Here, the relevant operation process of air conditioner load protection can be applied to the process of turning on the air conditioner to activate the heating mode in severe cold weather in winter, and can also be applied to the above load protection operation when the heating mode is used for anti-freeze protection.

In this embodiment, another temperature sensor is also provided at the discharge pipe port of the compressor of the air conditioner, and the temperature sensor can be used to detect the obtained discharge temperature of the compressor; at the same time, the above coil temperature is also set by the above It is detected by the temperature sensor on the indoor heat exchanger of the indoor unit.

Optionally, determining the mid-cold temperature according to the exhaust temperature of the compressor and the temperature of the inner coil of the indoor heat exchanger, including: calculating the mid-cold temperature according to the following formula,

Tcoil=A*Td+B*Tc+D,

Among them, Tcoil is the temperature in the cold medium, Td is the discharge temperature of the compressor, Tc is the temperature of the inner coil of the indoor heat exchanger, A is the first calculation coefficient related to the discharge temperature, and B is the temperature related to the coil. The second calculation coefficient of the connection, D is the calculation constant.

Optionally, in performing the load protection operation on the air conditioner according to the mid-cold temperature, it may first be determined whether the air conditioner needs to perform the load protection operation according to the mid-cold temperature; when it is determined that the air conditioner needs to perform the load protection operation, the air conditioner performs the corresponding load protection operation.

In this embodiment, determining whether the air conditioner needs to perform a load protection operation according to the mid-cold temperature may specifically include: comparing the mid-cold temperature with a preset temperature threshold, and determining whether the air conditioner needs to perform a load protection operation according to the comparison result. Specifically, when the mid-cold temperature is greater than or equal to the preset temperature threshold, it is determined that the air conditioner needs to perform a load protection operation; when the mid-cold temperature is less than the preset temperature threshold, it is determined that the air conditioner does not need to perform a load protection operation.

Optionally, the load protection operation performed by the air conditioner may include: reducing the operating frequency of the compressor, increasing the rotational speed of the indoor fan of the indoor unit, increasing the flow opening of the throttle device, and the like. Alternatively, the air conditioner may also use other load protection operations in the prior art to protect the safe operation of the heating mode of the air conditioner.

FIG. 2 is a control method for preventing freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 2 , the present invention also provides another control method for preventing freezing of an air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S201. Obtain the inlet air temperature, outlet air temperature and inner coil temperature of the indoor unit when the air conditioner operates in the cooling mode;

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

S202, determining the temperature change rate of the inner coil temperature;

As an optional embodiment, in order to determine the temperature change rate of the inner coil temperature in step S202, at least three inner coil temperatures can be sequentially detected at a set time interval in step S201, and the adjacent temperatures of the inner coils can be calculated respectively. The temperature difference between the two inner coil temperatures;

Here, the set time interval is 1 min, 2 min, 5 min, and so on.

Taking the set time interval as 1min as an example, after the process starts, the inner coil temperature t0 of number 1 is detected; after the interval of 1min, the inner coil temperature t1 of number 2 is detected again; after the interval of 1min again, the detection is obtained No. 3 inner coil temperature t2.

In this way, the temperature difference between the temperatures of two adjacent inner coils is calculated respectively, Δt1=t1-t0, Δt2=t2-t1;

Furthermore, the difference between the two adjacent temperature differences in order is calculated, and the temperature change rate is obtained as (Δt2-Δt1).

S203. Calculate the temperature difference between the inlet air temperature and the outlet air temperature;

S204. In response to the temperature difference between the inlet air temperature and the outlet air temperature being greater than the preset difference threshold, the temperature change rate of the inner coil temperature is greater than the preset rate threshold and the inner coil temperature is smaller than the preset temperature threshold , to determine that the indoor heat exchanger of the air conditioner has a freezing problem.

The air conditioner and the anti-freezing control method thereof provided by the present invention can judge the freezing condition of the air conditioner according to the air inlet temperature, the air outlet temperature and the temperature of the inner coil of the air conditioner, and can control the air conditioner in time when it can be determined that there is a freezing problem of the air conditioner. Anti-freezing protection is performed on the indoor heat exchanger; the anti-freezing control method can make the air conditioner trigger its own anti-freezing protection more timely and sensitively, and ensure the safe and stable operation of the air conditioner.

Optionally, the control method for anti-freezing of an air conditioner of the present invention further includes: in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode.

Optionally, the anti-freezing mode switched by the air conditioner of the present invention includes: sequentially executing a plurality of periodic processes defining anti-freezing operations, and the periodic process sequentially includes one or more anti-freezing operations defined as increasing the opening degree of the throttling device. One cycle process, one or more anti-freeze operations are defined as the second cycle process of reducing the frequency of the compressor, and one or more anti-freeze operations are defined as the third cycle process of controlling the shutdown of the air conditioner; the execution of each cycle process is completed Afterwards, it is re-determined whether the indoor heat exchanger of the air conditioner has a freezing problem; if the re-determined indoor heat exchanger of the air conditioner does not have a freezing problem, the anti-freezing mode is exited. For the specific execution flow of the above-mentioned anti-freeze mode, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 1 , which will not be repeated here.

Optionally, the control method for anti-freezing of an air conditioner according to the present invention further includes: acquiring the decay speed of the inner coil temperature and the inner coil temperature, and matching the frequency reduction amplitude of the compressor corresponding to the second cycle process according to a preset correlation relationship. , the correlation is used to characterize the decay rate of the inner coil temperature, the corresponding relationship between the inner coil temperature and the frequency reduction amplitude. The decay rate of the inner coil temperature in the correlation relationship is positively correlated with the frequency reduction amplitude. For the specific process of determining the frequency reduction range of the above-mentioned compressor, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 1 , which will not be repeated here.

Alternatively, the anti-freezing mode of the air conditioner switching may further include controlling the air conditioner to switch to the heating mode to operate. Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

FIG. 3 is a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 3 , the present invention also provides another control method for preventing freezing of the air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S301, in response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature and the first air outlet temperature of the indoor unit when the air conditioner operates in the current working mode;

Optionally, the air conditioner can generate a trigger signal to detect whether there is a freezing problem when the air conditioner is running in a specific mode (such as the cooling mode) at a preset time. trigger signal;

Alternatively, the remote control or control panel of the air conditioner provides an instruction input mode that can be input by the user to perform anti-freeze detection; the user can send the air conditioner to detect whether there is a freezing problem in the air conditioner by operating the remote control or the mode related to the anti-freeze detection of the control panel. trigger signal;

Here, the air conditioner is provided with a motor for driving the operation of the indoor fan, and the first working current in step S301 is the real-time working current of the motor in the current working mode;

Optionally, the current working mode in step S301 is a working mode such as a cooling mode or a dehumidification mode that is prone to cause freezing problems inside the indoor unit;

Here, for the specific execution process of the first inlet air temperature and the first outlet air temperature of the indoor unit, reference may be made to step S101 in the foregoing, which will not be repeated here;

S302. Determine whether the air conditioner has a freezing problem according to the first working current of the indoor fan, the first inlet air temperature and the first outlet air temperature of the indoor unit.

Optionally, in step S302, it is determined whether the air conditioner has a freezing problem according to the first working current of the indoor fan, the first inlet air temperature and the first outlet temperature of the indoor unit. The specific process includes: if the first working current of the indoor fan If the ratio to the preset reference current is smaller than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, it is determined that the indoor heat exchanger of the air conditioner exists Freeze problem.

Among them, the reference current is the current parameter preset by the air conditioner, which is used to represent the current value of the indoor fan when the air conditioner has no freezing problem; In the frozen state, the current standard value Ib of the motor under different internal fan gears, such as the high wind gear current standard value Ib1, the middle wind gear current standard value Ib2, the low wind wind gear current standard value is Ib3, etc.; therefore, the present invention can pre-store the above-mentioned multiple current standard values in the air conditioner as a reference current; here, when step S302 is executed, a match can be searched according to the currently set indoor fan gear position Obtain the corresponding current standard value, which is used as the reference current for calculating the first working current in step 302;

Optionally, the value of the ratio threshold is 0.9;

For example, if the reference current matched by a certain indoor fan gear is Ib, and the first working current of the indoor fan obtained in step S301 is Is, then when Is/Ib<0.9, it can be determined that the air-conditioning freezing judgment is satisfied. The judgment sub-conditions involving current parameters; and when Is/Ib ≥ 0.9, it can be determined that the judgment sub-conditions involving current parameters are not satisfied when the air-conditioning freezing judgment is performed.

The first temperature difference threshold is also a preset threshold parameter of the air conditioner. Optionally, the value of the first temperature difference threshold is 10°C;

The air conditioner and the anti-freezing control method thereof provided by the present invention can judge the freezing state of the air conditioner according to the working current of the internal fan of the air conditioner, the air inlet temperature and the air outlet temperature, and can control the freezing condition of the air conditioner in time when it can be determined that there is a freezing problem of the air conditioner. The air conditioner performs anti-freezing protection on the indoor heat exchanger; the anti-freezing control method enables the air conditioner to trigger its own anti-freezing protection more timely and sensitively, thereby ensuring the safe and stable operation of the air conditioner.

The anti-freezing control method for an air conditioner of the present invention further includes: in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; when the air conditioner determines that the indoor heat exchanger of the air conditioner has a freezing problem, switching the anti-freezing mode by Mode, which can avoid further aggravation of the freezing problem of the indoor unit of the air conditioner, and can reduce the amount of frost frozen on the indoor heat exchanger, so as to ensure the stable and safe operation of the air conditioner.

Optionally, the anti-freeze mode switched by the air conditioner includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio.

Here, the frequency of the compressor is reduced, which can reduce the amount of refrigerant delivered by the compressor to the refrigerant circulation pipeline of the air conditioner and reduce the exhaust temperature; in this way, the amount of refrigerant flowing into the indoor heat exchanger through the refrigerant circulation pipeline is reduced, and the inlet temperature is reduced. It can effectively improve the temperature conditions of frost and freezing in the indoor heat exchanger of the air conditioner.

Optionally, the value of the preset frequency is 0.8; that is, after the air conditioner is switched to the anti-freeze mode, the frequency of the compressor is reduced to 80% of the original frequency.

Optionally, the anti-freezing control method for an air conditioner of the present invention further includes: after the air conditioner performs the anti-freezing operation for a set period of time, acquiring the second working current of the indoor fan and the second air intake of the indoor unit when the air conditioner operates in the current working mode. temperature and the second outlet air temperature; if the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset second temperature difference threshold, the air conditioner is controlled Exit anti-freeze mode;

After the air conditioner performs the anti-freezing operation for a set period of time, it uses the above detection and judgment process to make a second judgment on the freezing state of the air conditioner, and exits the anti-freezing mode after meeting the preset conditions, and the air conditioner switches back to the air conditioner to perform anti-freezing. The working mode before the mode, such as the cooling mode; in this way, the impact of the air conditioner executing the anti-freezing mode on the cooling and cooling demand originally set by the user can be reduced, and the user experience can be improved.

Here, for the specific acquisition methods of the second working current, the second inlet air temperature and the second outlet air temperature, reference may be made to step S301 in the foregoing, which will not be repeated here.

The second temperature difference threshold is smaller than the first temperature difference threshold; optionally, the value of the second temperature difference threshold is 5°C.

Alternatively, the anti-freezing mode of the air conditioner switching may further include controlling the air conditioner to switch to the heating mode to operate. Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

In addition, optionally, after responding to the trigger signal, before acquiring the first working current of the indoor fan, the first inlet air temperature and the first outlet air temperature of the indoor unit when the air conditioner operates in the current working mode, the control method further includes: controlling the The air deflector of the indoor unit of the air conditioner is switched to the maximum air outlet angle. Here, when the air deflectors of the air conditioner are at different air outlet angles, the air outlet volume of the air conditioner will also be affected, which will cause certain interference effects on the air conditioner outlet air temperature and the current of the indoor fan. To determine the accuracy of the freezing problem, the present invention switches the air deflector of the air conditioner to the maximum value before obtaining the first working current of the indoor fan, the first air inlet temperature and the first air outlet temperature of the indoor unit when the air conditioner operates in the current working mode. The air outlet angle is adjusted so that the air conditioner can discharge the air with the maximum air output volume, so as to improve the detection accuracy of the relevant parameters.

Here, during the test and calculation process of the reference current required by the air conditioner above, the air deflector of the air conditioner is also kept at the position of the maximum air outlet angle.

FIG. 4 is a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 4 , the present invention also provides another control method for preventing freezing of the air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S401. In response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first outlet air temperature and the temperature of the inner coil when the air conditioner operates in the current working mode ;

In this embodiment, in addition to using the content disclosed in step S301 to detect the first working current, the first inlet air temperature and the first outlet air temperature in step S401, the indoor heat exchanger of the indoor unit is also provided with another A temperature sensor, which can be used to sense the real-time temperature of the inner coil of the indoor heat exchanger, therefore, in step S401, the real-time temperature of the inner coil detected by the temperature sensor is taken as the inner coil temperature;

S402. Determine whether the air conditioner has a freezing problem according to the first operating current of the indoor fan, the first air inlet temperature, the first air outlet temperature, and the temperature of the inner coil of the indoor unit.

Optionally, in step S402, it is determined whether the air conditioner has a freezing problem according to the first working current of the indoor fan, the first inlet air temperature and the first outlet temperature of the indoor unit, which may specifically include: if the first working current of the indoor fan The ratio of the current to the preset reference current is smaller than the preset ratio threshold, the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and the inner coil temperature is smaller than the preset If the freezing temperature threshold is set, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Here, the ratio of the first working current of the indoor fan to the preset reference current is less than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold. For the specific execution flow, reference may be made to the technical content of the corresponding part of the embodiment shown in FIG. 3 above, which will not be repeated here.

The freezing temperature threshold is a threshold parameter pre-stored by the air conditioner. Optionally, the freezing temperature threshold is 0°C.

The air conditioner and the anti-freezing control method thereof provided by the present invention can judge the freezing state of the air conditioner according to the working current of the internal fan of the air conditioner, the air inlet temperature, the air outlet temperature and the temperature of the inner coil, and can determine the freezing state of the air conditioner when it can be determined that the air conditioner freezes. When there is a problem, the air conditioner can be controlled in time to protect the indoor heat exchanger from freezing; the anti-freezing control method can make the air conditioner more timely and sensitive to trigger its own anti-freezing protection, and ensure the safe and stable operation of the air conditioner.

Optionally, the control method for anti-freezing of an air conditioner according to the present invention further includes: in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio.

Optionally, the control method for anti-freezing of an air conditioner according to the present invention further includes: after the air conditioner performs the anti-freezing operation for a set period of time, acquiring the second working current of the indoor fan and the second air intake of the indoor unit when the air conditioner operates in the current working mode. temperature and the second outlet air temperature; if the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset second temperature difference threshold, the air conditioner is controlled Exit the anti-freeze mode; the second temperature difference threshold is smaller than the first temperature difference threshold.

Alternatively, the anti-freezing mode of the air conditioner switching may further include controlling the air conditioner to switch to the heating mode to operate. Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

Optionally, after responding to the trigger signal, before acquiring the first working current of the inner fan, the first inlet air temperature, the first outlet air temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode, the control method further includes: : Control to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

Here, for the specific process of the air conditioner executing the above process, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 3 , which will not be repeated here.

FIG. 5 is a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 5 , the present invention also provides another control method for anti-freezing of an air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S501. In response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first outlet air temperature and the temperature of the inner coil when the air conditioner operates in the current working mode ;

In this embodiment, for the specific execution process of step S501, reference may be made to step S401 in the foregoing, which is not repeated here;

S502. Determine whether the air conditioner has a freezing problem according to the first working current of the indoor fan, the first inlet air temperature, the first outlet air temperature of the indoor unit, the inner coil temperature, and a preset freezing temperature threshold.

Optionally, in step S502, it is determined whether the air conditioner has a freezing problem according to the first working current of the indoor fan, the first inlet air temperature and the first outlet temperature of the indoor unit. The ratio of the current to the preset reference current is smaller than the preset ratio threshold, the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and the inner coil temperature is the same as the preset temperature difference. If the temperature difference of the freezing temperature threshold is greater than the preset second temperature difference threshold, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Here, the ratio of the first working current of the indoor fan to the preset reference current is less than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold. For the specific execution flow, reference may be made to the technical content of the corresponding part of the embodiment shown in FIG. 3 above, which will not be repeated here.

The freezing temperature threshold and the second temperature difference threshold are both pre-stored threshold parameters of an air conditioner. Optionally, the freezing temperature threshold is 0°C, and the second temperature difference threshold is 5°C.

The air conditioner and the anti-freezing control method thereof provided by the present invention can judge the freezing state of the air conditioner according to the working current of the internal fan of the air conditioner, the air inlet temperature, the air outlet temperature, the temperature of the inner coil and the freezing temperature threshold, and can determine the freezing state of the air conditioner when possible. When it is determined that there is an air conditioner freezing problem, the air conditioner is timely controlled to perform anti-freezing protection on the indoor heat exchanger; the anti-freezing control method can make the air conditioner more timely and sensitive to trigger its own anti-freezing protection, and ensure the safe and stable operation of the air conditioner.

Optionally, the control method for anti-freezing of an air conditioner of the present invention further includes: in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to the preset frequency, the preset frequency is the product of the current frequency of the compressor and the preset ratio; or, the opening degree of the throttling device is increased.

Optionally, the control method for anti-freezing of an air conditioner according to the present invention further includes: after the air conditioner performs the anti-freezing operation for a set period of time, acquiring the second working current of the indoor fan and the second air intake of the indoor unit when the air conditioner operates in the current working mode. temperature and the second outlet air temperature; if the second operating current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset third temperature difference threshold, the air conditioner is controlled Exit the anti-freeze mode; the third temperature difference threshold is smaller than the first temperature difference threshold.

Alternatively, the anti-freezing mode of the air conditioner switching may further include controlling the air conditioner to switch to the heating mode to operate. Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

Optionally, after responding to the trigger signal, before acquiring the first working current of the inner fan, the first inlet air temperature, the first outlet air temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode, the control method further includes: : Control to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

Here, for the specific process of the air conditioner executing the above process, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 3 , which will not be repeated here.

FIG. 6 is a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 6 , the present invention also provides another control method for preventing freezing of the air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S601. In response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first outlet air temperature and the temperature of the inner coil when the air conditioner operates in the current working mode ;

In this embodiment, for the specific execution process of step S601, reference may be made to step S401 in the foregoing, which is not repeated here;

S602. Determine whether the air conditioner has a freezing problem according to the first working current of the indoor fan, the preset ratio threshold, the first air inlet temperature, the first air outlet temperature and the inner coil temperature of the indoor unit.

Optionally, in step S602, it is determined whether the air conditioner has a freezing problem according to the first working current of the indoor fan, the first inlet air temperature and the first outlet temperature of the indoor unit, including: if the first working current of the indoor fan is different from the preset temperature The ratio of the set reference current is greater than the preset ratio threshold, the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and the inner coil temperature is lower than the preset freezing temperature If the threshold is set, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Here, the temperature difference between the first air inlet temperature and the first air outlet temperature is greater than the preset first temperature difference threshold, and the specific execution process of the inner coil temperature being less than the preset freezing temperature threshold value can be shown with reference to FIG. 4 above. The technical contents of the corresponding parts of the embodiments are not repeated here.

Optionally, the value of the ratio threshold is 1.2;

For example, if the reference current matched by a certain indoor fan gear is Ib, and the first working current of the indoor fan obtained in step S301 is Is, then when Is/Ib>1.2, it can be determined that the air conditioner freezing judgment is satisfied. The judgment sub-conditions involving current parameters; and when Is/Ib≤1.2, it can be determined that the judgment sub-conditions involving current parameters are not satisfied when the air-conditioning freezing judgment is performed.

Optionally, the control method for anti-freezing of an air conditioner according to the present invention further includes: in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio.

Alternatively, in addition to reducing the frequency of the compressor, the anti-freeze mode can also increase the opening of the throttle device.

Optionally, the control method for anti-freezing of an air conditioner according to the present invention further includes: after the air conditioner performs the anti-freezing operation for a set period of time, acquiring the second working current of the indoor fan and the second air intake of the indoor unit when the air conditioner operates in the current working mode. temperature and the second outlet air temperature; if the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset second temperature difference threshold, the air conditioner is controlled Exit the anti-freeze mode; the second temperature difference threshold is smaller than the first temperature difference threshold.

Alternatively, the anti-freezing mode of the air conditioner switching may further include controlling the air conditioner to switch to the heating mode to operate. Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

Optionally, after responding to the trigger signal, before acquiring the first working current of the inner fan, the first inlet air temperature, the first outlet air temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode, the control method further includes: : Control to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

Here, for the specific process of the air conditioner executing the above process, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 3 , which will not be repeated here.

FIG. 7 is a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 7 , the present invention also provides another control method for preventing freezing of the air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S701, in response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the current working current of the interior fan when the air conditioner operates in the current working mode;

In this embodiment, for the specific process of obtaining the current operating current, reference may be made to step S401 in the foregoing, which will not be repeated here.

S702, according to the current working current of the indoor fan, determine whether the air conditioner has a freezing problem;

Optionally, in step S702, it is determined whether the air conditioner has a freezing problem according to the current working current of the indoor fan. The specific process may include: if the current working current of the indoor fan is less than a preset first current threshold, determining that the air conditioner does not have a freezing problem. ; If the current working current of the indoor fan is greater than or equal to the preset first current threshold, it is determined that the air conditioner has a freezing problem;

Here, the first current threshold is a threshold parameter preset by the air conditioner, which is used to represent the critical current of the indoor fan corresponding to the freezing problem of the air conditioner.

S703. When it is determined that the air conditioner has a freezing problem, determine the anti-freezing operation corresponding to enabling the anti-freezing mode according to the current working current.

In response to determining that the air conditioner has a freezing problem, the air conditioner switches to the anti-freezing mode; therefore, in step S703, the anti-freezing operation corresponding to enabling the anti-freezing mode is determined according to the current working current, including:

If the current working current of the indoor fan is greater than or equal to the preset first current threshold and less than the preset second current threshold, the anti-freeze operation corresponding to the anti-freeze mode includes increasing the opening of the throttle device and decreasing the compression. the current frequency of the compressor to the first preset frequency; the first preset frequency is the product of the current frequency of the compressor and the first preset ratio, and the second current threshold is used to indicate that the indoor heat exchanger of the air conditioner reaches the first freezing point degree;

If the current working current of the indoor fan is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, the anti-freeze operation corresponding to the anti-freeze mode includes reducing the current frequency of the compressor to the first Two preset frequencies; the second preset frequency is the product of the current frequency of the compressor and the second preset ratio, and the third current threshold is used to indicate that the indoor heat exchanger of the air conditioner reaches the second freezing degree; the second preset frequency The ratio is smaller than the first preset ratio, and the second freezing degree is greater than the first freezing degree;

If the current working current of the indoor fan is greater than the preset third current threshold, the anti-freezing operation corresponding to the anti-freezing mode includes controlling the air conditioner to stop.

Alternatively, the anti-freezing mode of the air conditioner switching may further include controlling the air conditioner to switch to the heating mode to operate. Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

Optionally, the anti-freezing control method for an air conditioner of the present invention further includes: after the air conditioner performs the anti-freezing operation for a set period of time, obtaining the working current of the indoor fan when the air conditioner operates in the current working mode; Check whether the air conditioner has a freezing problem; if it is determined that the air conditioner does not have a freezing problem, control the air conditioner to exit the anti-freezing mode.

Here, for the above-mentioned process of re-determining the freezing problem of the air conditioner according to the working current of the indoor fan, reference may be made to steps S701 to S702 in the foregoing, which will not be repeated here.

Optionally, after responding to the trigger signal and before acquiring the current working current of the indoor fan when the air conditioner operates in the current working mode, the control method further includes: controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle. Here, for the specific process of the air conditioner executing the above process, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 3 , which will not be repeated here.

FIG. 8 is a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 8 , the present invention also provides another control method for preventing freezing of an air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S801, in response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the current working current of the inner fan, the temperature of the inner coil, the inlet air temperature and the outlet air temperature when the air conditioner operates in the current working mode;

In this embodiment, for the specific execution flow of step S801, reference may be made to step S401 in the foregoing, which is not repeated here.

S802. Determine whether the air conditioner has a freezing problem according to the current working current of the inner fan, the temperature of the inner coil, the temperature of the inlet air and the temperature of the outlet air;

Optionally, in step S802, it is determined whether the air conditioner has a freezing problem according to the current working current of the indoor fan, the temperature of the inner coil, the inlet air temperature and the outlet air temperature. The specific process includes: if the current working current of the indoor fan is less than a preset value. If the first current threshold and the temperature of the inner coil are greater than the preset freezing temperature threshold, and the temperature difference between the inlet air temperature and the outlet air temperature is smaller than the preset temperature difference threshold, it is determined that the air conditioner does not have a freezing problem; otherwise, it is determined that the air conditioner does not have a freezing problem. There is a freezing problem;

Here, the first current threshold, the freezing temperature threshold and the temperature difference threshold are preset threshold parameters of the air conditioner. The first current threshold is used to represent the critical current of the indoor fan corresponding to the freezing problem of the air conditioner; optionally, the freezing temperature threshold is 0°C; the temperature difference threshold is 5°C.

S803. When it is determined that the air conditioner has a freezing problem, determine the anti-freezing operation corresponding to enabling the anti-freezing mode according to the current working current and the temperature of the inner coil.

In response to determining that the air conditioner has a freezing problem, the air conditioner switches to the anti-freezing mode; therefore, in step S803, the anti-freezing operation corresponding to enabling the anti-freezing mode is determined according to the current operating current and the temperature of the inner coil, including:

If the current working current of the indoor fan is greater than or equal to the preset first current threshold and less than the preset second current threshold, and the temperature of the inner coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode corresponding to the The freezing operation includes increasing the opening of the throttling device and reducing the current frequency of the compressor to a first preset frequency; the first preset frequency is the product of the current frequency of the compressor and the first preset ratio, and the second current The threshold is used to characterize that the indoor heat exchanger of the air conditioner reaches the first freezing degree;

If the current working current of the indoor fan is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, and the temperature of the inner coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode will The corresponding anti-freezing operation includes reducing the current frequency of the compressor to a second preset frequency; the second preset frequency is the product of the current frequency of the compressor and the second preset ratio, and the third current threshold is used to represent the air conditioner. The indoor heat exchanger reaches the second icing degree; the second preset ratio is smaller than the first preset ratio, and the second icing degree is greater than the first icing degree;

If the current operating current of the indoor fan is greater than the preset third current threshold, and the temperature of the inner coil is less than or equal to the preset freezing temperature threshold, the anti-freezing operation corresponding to the anti-freezing mode includes controlling the air conditioner to stop. Alternatively, the anti-freezing mode of the air conditioner switching may further include controlling the air conditioner to switch to the heating mode to operate.

Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

Optionally, the anti-freezing control method for an air conditioner of the present invention further includes: after the air conditioner performs the anti-freezing operation for a set period of time, obtaining the working current of the interior fan when the air conditioner operates in the current working mode; Pipe temperature, inlet air temperature and outlet air temperature, and re-determine whether there is a freezing problem in the air conditioner;

Here, for the above-mentioned process of re-determining the freezing problem of the air conditioner according to the working current of the indoor fan, reference may be made to step S803 in the foregoing, which will not be repeated here.

If it is determined that the air conditioner does not have a freezing problem, control the air conditioner to exit the anti-freezing mode.

Optionally, after responding to the trigger signal, before acquiring the current working current of the inner fan, the temperature of the inner coil, the temperature of the inlet air and the temperature of the outlet air when the air conditioner operates in the current working mode, the control method further includes: controlling the indoor air conditioner The air deflector of the machine is switched to the maximum air outlet angle. Here, for the specific process of the air conditioner executing the above process, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 3 , which will not be repeated here.

FIG. 9 is a control method for anti-freezing of an air conditioner according to another exemplary embodiment of the present invention.

As shown in FIG. 9 , the present invention also provides another control method for preventing freezing of an air conditioner, which can also be used to solve the freezing of the heat exchange tubes of the indoor heat exchanger caused by the low temperature refrigerant when the air conditioner operates in the refrigeration or dehumidification mode. And then affect the problem of air outlet and heat exchange efficiency; specifically, the main process steps of the method include:

S901, in response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the current working current of the inner fan, the temperature of the outer coil, the inlet air temperature and the outlet air temperature when the air conditioner operates in the current working mode;

In this embodiment, in addition to detecting the current operating current, inlet air temperature and outlet air temperature disclosed in step S301 in step S901, the outdoor heat exchanger of the outdoor unit is also provided with another temperature sensor, which can be used For sensing the real-time temperature of the outer coil of the outdoor heat exchanger, therefore, in step S901, the real-time temperature of the outer coil detected by the temperature sensor is used as the outer coil temperature;

S902. Determine whether the air conditioner has a freezing problem according to the current working current of the inner fan, the temperature of the outer coil, the temperature of the inlet air and the temperature of the outlet air;

Optionally, in step S902, it is determined whether the air conditioner has a freezing problem according to the current working current of the inner fan, the temperature of the outer coil, the temperature of the inlet air and the temperature of the outlet air, which may specifically include: if the current working current of the inner fan is less than a preset value. If the first current threshold and the temperature of the outer coil are greater than the preset freezing temperature threshold, and the temperature difference between the inlet air temperature and the outlet air temperature is smaller than the preset temperature difference threshold, it is determined that the air conditioner does not have a freezing problem; otherwise, it is determined that the air conditioner does not have a freezing problem. There is a freezing problem;

Here, the first current threshold, freezing temperature threshold and temperature difference threshold are preset threshold parameters of the air conditioner; wherein, the first current threshold is used to represent the critical current of the indoor fan corresponding to the freezing problem of the air conditioner; optionally, the freezing temperature The threshold value is -2°C; the temperature difference threshold value is 5°C.

S903. When it is determined that the air conditioner has a freezing problem, determine the anti-freezing operation corresponding to enabling the anti-freezing mode according to the current operating current and the temperature of the outer coil.

In response to determining that the air conditioner has a freezing problem, the air conditioner switches to the anti-freezing mode; therefore, in step S903, the anti-freezing operation corresponding to enabling the anti-freezing mode is determined according to the current operating current and the temperature of the outer coil, including:

If the current operating current of the indoor fan is greater than or equal to the preset first current threshold and less than the preset second current threshold, and the temperature of the outer coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode corresponding to the The freezing operation includes increasing the opening of the throttling device and reducing the current frequency of the compressor to a first preset frequency; the first preset frequency is the product of the current frequency of the compressor and the first preset ratio, and the second current The threshold is used to characterize that the indoor heat exchanger of the air conditioner reaches the first freezing degree;

If the current operating current of the indoor fan is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, and the temperature of the outer coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode will The corresponding anti-freezing operation includes reducing the current frequency of the compressor to a second preset frequency; the second preset frequency is the product of the current frequency of the compressor and the second preset ratio, and the third current threshold is used to represent the air conditioner. The indoor heat exchanger reaches the second icing degree; the second preset ratio is smaller than the first preset ratio, and the second icing degree is greater than the first icing degree;

If the current operating current of the indoor fan is greater than the preset third current threshold, and the temperature of the outer coil is less than or equal to the preset freezing temperature threshold, the anti-freezing operation corresponding to the anti-freezing mode includes controlling the air conditioner to stop.

Here, the specific execution flow of the air conditioner switching to the heating mode and the load protection operation when the air conditioner operates in the heating mode can refer to the technical contents disclosed in the foregoing embodiments, and will not be repeated here.

Optionally, the anti-freezing control method for an air conditioner of the present invention further includes: after the air conditioner performs the anti-freezing operation for a set period of time, obtaining the working current of the interior fan when the air conditioner operates in the current working mode; Pipe temperature, inlet air temperature and outlet air temperature, and re-determine whether there is a freezing problem in the air conditioner;

Here, the above based on the working current of the inner fan, the temperature of the outer coil, the temperature of the inlet air and the temperature of the outlet air may refer to step S902 in the foregoing, which will not be repeated here.

If it is determined that the air conditioner does not have a freezing problem, control the air conditioner to exit the anti-freezing mode.

Optionally, after responding to the trigger signal, before acquiring the current working current of the inner fan, the temperature of the outer coil, the temperature of the inlet air and the temperature of the outlet air when the air conditioner operates in the current working mode, the control method further includes: controlling the indoor air conditioner The air deflector of the machine is switched to the maximum air outlet angle. Here, for the specific process of the air conditioner executing the above process, reference may be made to the technical content disclosed in the corresponding part of the embodiment shown in FIG. 3 , which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, which can execute the control process disclosed in the embodiment of FIG. 1 above.

The air conditioner also includes an air conditioner body and a controller. The controller is used for:

Obtain the inlet air temperature, outlet air temperature and inner coil temperature of the indoor unit when the air conditioner is running in cooling mode;

In response to the temperature difference between the inlet air temperature and the outlet air temperature being greater than a preset difference threshold, and the inner coil temperature being less than the preset temperature threshold, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Optionally, the controller is also used to:

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, the air conditioner is controlled to switch to an anti-freeze mode.

Optional, anti-freeze modes include:

A plurality of cyclic processes defining anti-freezing operations are sequentially executed, the cyclic process sequentially including one or more anti-freezing operations defined as a first cycle of increasing the opening of the throttling device, and one or more anti-freezing operations defined as reducing compression The second cycle process of the frequency of the air conditioner, and one or more anti-freezing operations are limited to the third cycle process of controlling the shutdown of the air conditioner; after each cycle process is completed, it is re-determined whether the indoor heat exchanger of the air conditioner has a freezing problem; if If there is no freezing problem in the indoor heat exchanger of the re-determined air conditioner, the anti-freezing mode is exited.

Optionally, the controller is also used to:

Obtain the attenuation speed of the inner coil temperature and the inner coil temperature, and obtain the corresponding frequency reduction amplitude of the compressor in the second cycle process according to the preset correlation relationship. Corresponding relationship between coil temperature and frequency reduction amplitude.

Optionally, the decay rate of the inner coil temperature in the correlation relationship is positively correlated with the frequency reduction amplitude.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 2 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

Obtain the inlet air temperature, outlet air temperature and inner coil temperature of the indoor unit when the air conditioner is running in cooling mode;

In response to the temperature difference between the inlet air temperature and the outlet air temperature being greater than the preset difference threshold, the temperature change rate of the inner coil temperature is greater than the preset rate threshold and the inner coil temperature is smaller than the preset temperature threshold, determine The indoor heat exchanger of the air conditioner has a freezing problem.

Optionally, the controller is also used to:

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, the air conditioner is controlled to switch to an anti-freeze mode.

Optional, anti-freeze modes include:

A plurality of cyclic processes defining anti-freezing operations are sequentially executed, the cyclic process sequentially including one or more anti-freezing operations defined as a first cycle of increasing the opening of the throttling device, and one or more anti-freezing operations defined as reducing compression The second cycle process of the frequency of the air conditioner, and one or more anti-freezing operations are limited to the third cycle process of controlling the shutdown of the air conditioner; after each cycle process is completed, it is re-determined whether the indoor heat exchanger of the air conditioner has a freezing problem; if If there is no freezing problem in the indoor heat exchanger of the re-determined air conditioner, the anti-freezing mode is exited.

Optionally, the controller is also used to:

Obtain the attenuation speed of the inner coil temperature and the inner coil temperature, and obtain the corresponding frequency reduction amplitude of the compressor in the second cycle process according to the preset correlation relationship. Corresponding relationship between coil temperature and frequency reduction amplitude.

Optionally, the decay rate of the inner coil temperature in the correlation relationship is positively correlated with the frequency reduction amplitude.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 3 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature and the first air outlet temperature of the indoor unit when the air conditioner operates in the current working mode;

According to the first working current of the indoor fan, the first air inlet temperature and the first air outlet temperature of the indoor unit, it is determined whether the air conditioner has a freezing problem.

Optionally, the controller is specifically used to:

If the ratio of the first working current of the indoor fan to the preset reference current is less than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, then It is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Optionally, the controller is also used to:

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freeze mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio.

Optionally, the controller is also used to:

After the air conditioner performs the anti-freezing operation for a set period of time, obtain the second working current of the indoor fan, the second inlet air temperature and the second outlet air temperature of the indoor unit when the air conditioner operates in the current working mode;

If the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset second temperature difference threshold, control the air conditioner to exit the anti-freeze mode;

The second temperature difference threshold is smaller than the first temperature difference threshold.

Optionally, the controller is further configured to control the operation of the air conditioner before acquiring the first working current of the indoor fan, the first air inlet temperature and the first air outlet temperature of the indoor unit when the air conditioner operates in the current working mode after responding to the trigger signal. The air deflector of the indoor unit is switched to the maximum air outlet angle.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 4 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode;

According to the first working current of the indoor fan, the first air inlet temperature of the indoor unit, the first air outlet temperature and the temperature of the inner coil, it is determined whether the air conditioner has a freezing problem.

Optionally, the controller is specifically used to:

If the ratio of the first working current of the indoor fan to the preset reference current is smaller than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and If the temperature of the inner coil is lower than the preset freezing temperature threshold, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Optionally, the controller is also used to:

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freeze mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio.

Optionally, the controller is also used to:

After the air conditioner performs the anti-freezing operation for a set period of time, obtain the second working current of the indoor fan, the second inlet air temperature and the second outlet air temperature of the indoor unit when the air conditioner operates in the current working mode;

If the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset second temperature difference threshold, control the air conditioner to exit the anti-freeze mode;

The second temperature difference threshold is smaller than the first temperature difference threshold.

Optionally, the controller is further configured to obtain the first working current of the indoor fan when the air conditioner operates in the current working mode, the first inlet air temperature of the indoor unit, the first outlet air temperature, and the temperature of the inner coil before responding to the trigger signal. , and control to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 5 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode;

According to the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature of the indoor unit, the temperature of the inner coil, and the preset freezing temperature threshold, it is determined whether the air conditioner has a freezing problem.

Optionally, the controller is specifically used to:

If the ratio of the first working current of the indoor fan to the preset reference current is smaller than the preset ratio threshold, and the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and If the temperature difference between the inner coil temperature and the preset freezing temperature threshold is greater than the preset second temperature difference threshold, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Optionally, the controller is also used to:

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freeze mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio; or, increasing the opening degree of the throttling device.

Optionally, the controller is also used to:

After the air conditioner performs the anti-freezing operation for a set period of time, obtain the second working current of the indoor fan, the second inlet air temperature and the second outlet air temperature of the indoor unit when the air conditioner operates in the current working mode;

If the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset third temperature difference threshold, control the air conditioner to exit the anti-freeze mode;

The third temperature difference threshold is smaller than the first temperature difference threshold.

Optionally, the controller is further configured to: after responding to the trigger signal, obtain the first working current of the indoor fan, the first inlet air temperature, the first outlet air temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode Before, the control switches the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 6 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the first working current of the indoor fan, the first air inlet temperature, the first air outlet temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode;

According to the first working current of the indoor fan, the preset ratio threshold, the first air inlet temperature of the indoor unit, the first air outlet temperature and the temperature of the inner coil, it is determined whether the air conditioner has a freezing problem.

Optionally, the controller is specifically used to:

If the ratio of the first working current of the indoor fan to the preset reference current is greater than the preset ratio threshold, the temperature difference between the first inlet air temperature and the first outlet temperature is greater than the preset first temperature difference threshold, and If the temperature of the inner coil is lower than the preset freezing temperature threshold, it is determined that the indoor heat exchanger of the air conditioner has a freezing problem.

Optionally, the controller is also used to:

In response to determining that the indoor heat exchanger of the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freeze mode;

Wherein, the anti-freezing mode includes: controlling to reduce the current frequency of the compressor to a preset frequency, where the preset frequency is the product of the current frequency of the compressor and a preset ratio; or, increasing the opening degree of the throttling device.

Optionally, the controller is also used to:

After the air conditioner performs the anti-freezing operation for a set period of time, obtain the second working current of the indoor fan, the second inlet air temperature and the second outlet air temperature of the indoor unit when the air conditioner operates in the current working mode;

If the second working current is equal to the preset reference current, and the temperature difference between the second inlet air temperature and the second outlet air temperature is less than the preset second temperature difference threshold, control the air conditioner to exit the anti-freeze mode;

The second temperature difference threshold is smaller than the first temperature difference threshold.

Optionally, the controller is further configured to: after responding to the trigger signal, obtain the first working current of the indoor fan, the first inlet air temperature, the first outlet air temperature and the inner coil temperature of the indoor unit when the air conditioner operates in the current working mode Before, the control switches the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 7 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

In response to receiving a trigger signal for detecting whether the air conditioner has a freezing problem, obtain the current working current of the interior fan when the air conditioner operates in the current working mode;

According to the current working current of the indoor fan, it is determined whether the air conditioner has a freezing problem; and when it is determined that the air conditioner has a freezing problem, the anti-freezing operation corresponding to enabling the anti-freezing mode is determined according to the current working current.

Optionally, the controller is specifically used to:

If the current working current of the indoor fan is less than the preset first current threshold, it is determined that the air conditioner does not have a freezing problem;

If the current working current of the indoor fan is greater than or equal to the preset first current threshold, it is determined that the air conditioner has a freezing problem;

Wherein, the first current threshold is used to represent the critical current of the indoor fan corresponding to the freezing problem of the air conditioner.

Optionally, the controller is further configured to: in response to determining that the air conditioner has a freezing problem, switch the air conditioner to an anti-freezing mode;

The controller is specifically used for:

If the current working current of the indoor fan is greater than or equal to the preset first current threshold and less than the preset second current threshold, the anti-freeze operation corresponding to the anti-freeze mode includes increasing the opening of the throttle device and decreasing the compression. the current frequency of the compressor to the first preset frequency; the first preset frequency is the product of the current frequency of the compressor and the first preset ratio, and the second current threshold is used to indicate that the indoor heat exchanger of the air conditioner reaches the first freezing point degree;

If the current working current of the indoor fan is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, the anti-freeze operation corresponding to the anti-freeze mode includes reducing the current frequency of the compressor to the first Two preset frequencies; the second preset frequency is the product of the current frequency of the compressor and the second preset ratio, and the third current threshold is used to indicate that the indoor heat exchanger of the air conditioner reaches the second freezing degree; the second preset frequency The ratio is smaller than the first preset ratio, and the second freezing degree is greater than the first freezing degree;

If the current working current of the indoor fan is greater than the preset third current threshold, the anti-freezing operation corresponding to the anti-freezing mode includes controlling the air conditioner to stop.

Optionally, the controller is also used to:

After the air conditioner performs the anti-freezing operation and continues for a set period of time, obtain the working current of the internal fan when the air conditioner is running in the current working mode;

According to the working current of the indoor fan, re-determine whether the air conditioner has a freezing problem;

If it is determined that the air conditioner does not have a freezing problem, control the air conditioner to exit the anti-freezing mode.

Optionally, the controller is further configured to: control to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle after responding to the trigger signal and before obtaining the current working current of the indoor fan when the air conditioner operates in the current working mode.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 8 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the current working current of the inner fan, the temperature of the inner coil, the temperature of the inlet air and the temperature of the outlet air when the air conditioner operates in the current working mode;

Determine whether the air conditioner has a freezing problem according to the current working current of the indoor fan, the temperature of the inner coil, the temperature of the inlet air and the temperature of the outlet air; and when it is determined that the air conditioner has a freezing problem, it is determined to enable anti-freezing according to the current working current and the temperature of the inner coil. The anti-freeze operation corresponding to the mode.

Optionally, the controller is specifically used to:

If the current working current of the indoor fan is less than the preset first current threshold, the temperature of the inner coil is greater than the preset freezing temperature threshold, and the temperature difference between the inlet air temperature and the outlet air temperature is smaller than the preset temperature difference threshold, then It is determined that the air conditioner does not have a freezing problem; otherwise, it is determined that the air conditioner has a freezing problem;

Wherein, the first current threshold is used to represent the critical current of the indoor fan corresponding to the freezing problem of the air conditioner.

Optionally, the controller is further configured to switch the air conditioner to an anti-freeze mode in response to determining that the air conditioner has a freezing problem;

The controller is specifically used for:

If the current working current of the indoor fan is greater than or equal to the preset first current threshold and less than the preset second current threshold, and the temperature of the inner coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode corresponding to the The freezing operation includes increasing the opening of the throttling device and reducing the current frequency of the compressor to a first preset frequency; the first preset frequency is the product of the current frequency of the compressor and the first preset ratio, and the second current The threshold is used to characterize that the indoor heat exchanger of the air conditioner reaches the first freezing degree;

If the current working current of the indoor fan is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, and the temperature of the inner coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode will The corresponding anti-freezing operation includes reducing the current frequency of the compressor to a second preset frequency; the second preset frequency is the product of the current frequency of the compressor and the second preset ratio, and the third current threshold is used to represent the air conditioner. The indoor heat exchanger reaches the second icing degree; the second preset ratio is smaller than the first preset ratio, and the second icing degree is greater than the first icing degree;

If the current operating current of the indoor fan is greater than the preset third current threshold, and the temperature of the inner coil is less than or equal to the preset freezing temperature threshold, the anti-freezing operation corresponding to the anti-freezing mode includes controlling the air conditioner to stop.

Optionally, the controller is also used to:

After the air conditioner performs the anti-freezing operation and continues for a set period of time, obtain the working current of the internal fan when the air conditioner is running in the current working mode;

According to the working current of the indoor fan, the temperature of the inner coil, the temperature of the inlet air and the temperature of the outlet air, re-determine whether the air conditioner has a freezing problem;

If it is determined that the air conditioner does not have a freezing problem, control the air conditioner to exit the anti-freezing mode.

Optionally, the controller is further configured to control the indoor air conditioner for the air conditioner before acquiring the current working current of the inner fan, the temperature of the inner coil, the inlet air temperature and the outlet air temperature when the air conditioner operates in the current working mode after responding to the trigger signal. The air deflector of the machine is switched to the maximum air outlet angle.

The specific manner in which the air-conditioning control executes the above process may refer to the foregoing embodiments, which will not be repeated here.

In an optional embodiment, the present invention further provides an air conditioner, and the air conditioner can execute the control process disclosed in the embodiment of FIG. 9 above.

The air conditioner includes an air conditioner body and a controller. The controller is used for:

In response to receiving the trigger signal for detecting whether the air conditioner has a freezing problem, obtain the current working current of the inner fan, the temperature of the outer coil, the inlet air temperature and the outlet air temperature when the air conditioner operates in the current working mode;

Determine whether the air conditioner has a freezing problem according to the current working current of the indoor fan, the temperature of the outer coil, the temperature of the inlet air and the temperature of the outlet air; and when it is determined that the air conditioner has a freezing problem, it is determined to enable anti-freezing according to the current working current and the temperature of the outer coil. The anti-freeze operation corresponding to the mode.

Optionally, the controller is specifically used to:

If the current operating current of the indoor fan is less than the preset first current threshold, the temperature of the outer coil is greater than the preset freezing temperature threshold, and the temperature difference between the inlet air temperature and the outlet air temperature is smaller than the preset temperature difference threshold, then It is determined that the air conditioner does not have a freezing problem; otherwise, it is determined that the air conditioner has a freezing problem;

Wherein, the first current threshold is used to represent the critical current of the indoor fan corresponding to the freezing problem of the air conditioner.

Optionally, the controller is further configured to switch the air conditioner to an anti-freeze mode in response to determining that the air conditioner has a freezing problem;

The controller is specifically used for:

If the current operating current of the indoor fan is greater than or equal to the preset first current threshold and less than the preset second current threshold, and the temperature of the outer coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode corresponding to the The freezing operation includes increasing the opening of the throttling device and reducing the current frequency of the compressor to a first preset frequency; the first preset frequency is the product of the current frequency of the compressor and the first preset ratio, and the second current The threshold is used to characterize that the indoor heat exchanger of the air conditioner reaches the first freezing degree;

If the current operating current of the indoor fan is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, and the temperature of the outer coil is less than or equal to the preset freezing temperature threshold, the anti-freeze mode will The corresponding anti-freezing operation includes reducing the current frequency of the compressor to a second preset frequency; the second preset frequency is the product of the current frequency of the compressor and the second preset ratio, and the third current threshold is used to represent the air conditioner. The indoor heat exchanger reaches the second icing degree; the second preset ratio is smaller than the first preset ratio, and the second icing degree is greater than the first icing degree;

If the current operating current of the indoor fan is greater than the preset third current threshold, and the temperature of the outer coil is less than or equal to the preset freezing temperature threshold, the anti-freezing operation corresponding to the anti-freezing mode includes controlling the air conditioner to stop.

Optionally, the controller is also used to:

After the air conditioner performs the anti-freezing operation and continues for a set period of time, obtain the working current of the internal fan when the air conditioner is running in the current working mode;

According to the working current of the inner fan, the temperature of the outer coil, the inlet air temperature and the outlet air temperature, re-determine whether the air conditioner has a freezing problem;

If it is determined that the air conditioner does not have a freezing problem, control the air conditioner to exit the anti-freezing mode.

Optionally, the controller is further configured to: after responding to the trigger signal, before acquiring the current working current of the inner fan, the temperature of the outer coil, the inlet air temperature and the outlet air temperature when the air conditioner is running in the current working mode, control the air conditioner to operate the air conditioner. The air deflector of the indoor unit is switched to the maximum air outlet angle.

The specific manner in which the air-conditioning control executes 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 (8)

1. A control method for preventing freezing of an air conditioner is characterized by comprising the following steps:

responding to a received trigger signal for detecting whether the air conditioner has a freezing problem, and acquiring a first working current of an inner fan, a first air inlet temperature of an indoor unit, a first air outlet temperature and an inner coil temperature when the air conditioner runs in a current working mode;

determining whether the air conditioner has a freezing problem or not according to a first working current of the inner fan, a first air inlet temperature of the indoor unit, a first air outlet temperature, an inner coil temperature and a preset freezing temperature threshold value;

if the ratio of the first working current of the inner fan to a preset reference current is smaller than a preset ratio threshold, the temperature difference between the first inlet air temperature and the first outlet air temperature is larger than a preset first temperature difference threshold, and the temperature difference between the temperature of the inner coil and the preset freezing temperature threshold is larger than a preset second temperature difference threshold, determining that the indoor heat exchanger of the air conditioner has a freezing problem;

when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of an inner coil of the indoor heat exchanger; determining the cold-medium temperature according to the exhaust temperature of the compressor and the temperature of an inner coil of the indoor heat exchanger; carrying out load protection operation on the air conditioner according to the cold medium temperature;

the cold medium temperature is calculated according to the following formula,

Tcoil=A*Td+B*Tc+D，

wherein Tcoil is the cold medium temperature, Td is the discharge temperature of the compressor, Tc is the inner coil temperature of the indoor heat exchanger, a is a first calculated coefficient associated with the discharge temperature, B is a second calculated coefficient associated with the inner coil temperature, and D is a calculated constant.

2. The control method according to claim 1, characterized by further comprising:

controlling the air conditioner to switch to an anti-freezing mode in response to determining that an indoor heat exchanger of the air conditioner has a freezing problem;

wherein the freeze prevention mode includes: controlling to reduce a current frequency of a compressor to a preset frequency, wherein the preset frequency is the product of the current frequency of the compressor and a preset proportion; alternatively, the opening degree of the throttle device is increased.

3. The control method according to claim 2, characterized by further comprising:

after the air conditioner executes the anti-freezing mode and lasts for a set time, acquiring a second working current of an internal fan, a second air inlet temperature and a second air outlet temperature of an indoor unit when the air conditioner runs in the current working mode;

if the second working current is equal to the preset reference current and the temperature difference value between the second inlet air temperature and the second outlet air temperature is smaller than a preset third temperature difference threshold value, controlling the air conditioner to exit the anti-freezing mode;

the third temperature difference threshold is less than the first temperature difference threshold.

4. The control method according to claim 1, wherein after responding to the trigger signal, before obtaining a first operating current of an inner fan, a first inlet air temperature of an indoor unit, a first outlet air temperature and an inner coil temperature when the air conditioner operates in a current operating mode, the control method further comprises:

and controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.

5. An air conditioner, characterized in that, the air conditioner includes air conditioner organism and controller, the controller is used for:

responding to a received trigger signal for detecting whether the air conditioner has a freezing problem, and acquiring a first working current of an inner fan, a first air inlet temperature of an indoor unit, a first air outlet temperature and an inner coil temperature when the air conditioner runs in a current working mode;

determining whether the air conditioner has a freezing problem or not according to a first working current of the inner fan, a first air inlet temperature of the indoor unit, a first air outlet temperature, an inner coil temperature and a preset freezing temperature threshold value;

if the ratio of the first working current of the inner fan to a preset reference current is smaller than a preset ratio threshold, the temperature difference between the first inlet air temperature and the first outlet air temperature is larger than a preset first temperature difference threshold, and the temperature difference between the temperature of the inner coil and the preset freezing temperature threshold is larger than a preset second temperature difference threshold, determining that the indoor heat exchanger of the air conditioner has a freezing problem;

when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of an inner coil of the indoor heat exchanger; determining the cold-medium temperature according to the exhaust temperature of the compressor and the temperature of an inner coil of the indoor heat exchanger; carrying out load protection operation on the air conditioner according to the cold medium temperature;

the cold medium temperature is calculated according to the following formula,

Tcoil=A*Td+B*Tc+D，

wherein Tcoil is the cold medium temperature, Td is the discharge temperature of the compressor, Tc is the inner coil temperature of the indoor heat exchanger, a is a first calculated coefficient associated with the discharge temperature, B is a second calculated coefficient associated with the inner coil temperature, and D is a calculated constant.

6. The air conditioner of claim 5, wherein the controller is further configured to:

controlling the air conditioner to switch to an anti-freezing mode in response to determining that an indoor heat exchanger of the air conditioner has a freezing problem;

wherein the freeze prevention mode includes: controlling to reduce a current frequency of a compressor to a preset frequency, wherein the preset frequency is the product of the current frequency of the compressor and a preset proportion; alternatively, the opening degree of the throttle device is increased.

7. The air conditioner of claim 6, wherein the controller is further configured to:

after the air conditioner executes the anti-freezing mode and lasts for a set time, acquiring a second working current of an internal fan, a second air inlet temperature and a second air outlet temperature of an indoor unit when the air conditioner runs in the current working mode;

if the second working current is equal to the preset reference current and the temperature difference value between the second inlet air temperature and the second outlet air temperature is smaller than a preset third temperature difference threshold value, controlling the air conditioner to exit the anti-freezing mode;

the third temperature difference threshold is less than the first temperature difference threshold.

8. The air conditioner of claim 5, wherein the controller is further configured to: and after responding to the trigger signal, controlling to switch an air deflector of the indoor unit of the air conditioner to a maximum air outlet angle before acquiring a first working current of the inner fan, a first air inlet temperature, a first air outlet temperature and an inner coil temperature when the air conditioner operates in a current working mode.

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