CN115899994A - Air conditioner and its control method - Google Patents

Abstract

The present invention provides an air conditioner and its control method. The control method of the air conditioner includes obtaining the surface temperature Tr of the evaporator of the air conditioner; if the surface temperature Tr satisfies the opening condition of the first antifreeze mode, the first antifreeze mode is activated. , the control items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the speed of the indoor fan of the air conditioner, reducing the speed of the outdoor fan of the air conditioner, and increasing the opening of the expansion valve of the air conditioner; After the first antifreeze mode achieves the adjustment target, start the second antifreeze mode. The invention alleviates the problem of temperature fluctuation caused by the air conditioner when operating the freezing protection mechanism.

Description

Air conditioner and its control method

technical field

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

Background technique

When the air conditioner is running in refrigeration, the surface temperature of the evaporator is often too low due to various factors such as low inlet air temperature and insufficient refrigerant circulation, until freezing occurs, which is called evaporator freezing. Freezing of the evaporator will lead to adverse consequences such as water leakage, water blowing, and ice blowing.

In order to solve the problem of evaporator freezing, when the air conditioner is in cooling operation, it usually reduces the frequency of the compressor until it is shut down. However, frequency reduction, shutdown, startup, and frequency up operations during the operation of the air conditioner will cause large temperature fluctuations and affect the user's cooling and heating experience.

Contents of the invention

The purpose of the present invention is to solve at least one of the above-mentioned drawbacks of the prior art.

The purpose of the present invention is to alleviate the temperature fluctuation problem caused by the air conditioner when operating the freeze protection mechanism.

In one aspect, the present invention provides an air conditioner control method, including:

Obtain the surface temperature Tr of the evaporator of the air conditioner;

If the surface temperature Tr satisfies the opening condition of the first antifreeze mode, the first antifreeze mode is turned on; the control items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the One or more of the speed of the indoor fan, reducing the speed of the outdoor fan of the air conditioner, and increasing the opening of the expansion valve of the air conditioner;

After the first anti-freezing mode reaches the adjustment target, the second anti-freezing mode is started.

Optionally, the adjustment target is: the surface temperature Tr no longer satisfies the activation condition of the first antifreeze mode, or the adjustment parameter of the adjustment item has been adjusted to a limit value.

Optionally, the regulation strategy of at least one of the regulation items is: adjusting the corresponding regulation parameters step by step until the regulation target is achieved.

Optionally, the adjustment items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the speed of the indoor fan of the air conditioner, reducing the speed of the outdoor fan of the air conditioner, and increasing the Multiple items in the opening of the expansion valve of the air conditioner;

In the first antifreeze mode, run each of the control items in a preset order; and

If the control parameter of the control item in the front order is adjusted to the limit value, the surface temperature Tr no longer satisfies the opening condition of the first antifreeze mode, and it is determined that the adjustment target is achieved, otherwise enter the next control item;

The regulation item at the end of the sequence makes the surface temperature Tr no longer satisfy the activation condition of the first antifreeze mode, or the regulation parameter is adjusted to a limit value, and it is determined that the regulation target is achieved.

Optionally, the execution sequence of the control items of the first antifreeze mode is as follows from front to back: increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the speed of the indoor fan of the air conditioner, and reducing the air outlet of the air conditioner. The speed of the outdoor fan increases the opening of the expansion valve of the air conditioner.

Optionally, the adjustment items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the speed of the indoor fan of the air conditioner, reducing the speed of the outdoor fan of the air conditioner, and increasing the Multiple items in the opening of the expansion valve of the air conditioner;

Under the first anti-freezing mode, execute each control item at the same time;

When the surface temperature Tr no longer satisfies the condition for starting the first antifreeze mode, or the control parameters of each control item have been adjusted to a limit value, it is determined that the adjustment target is achieved.

Optionally, the condition that the surface temperature Tr satisfies the activation of the first antifreeze mode includes: Tr≤T1, where T1 is a preset freezing protection temperature.

Optionally, the second antifreeze mode includes: controlling the frequency reduction of the compressor of the air conditioner until it stops.

After the first anti-freezing mode achieves the adjustment target, the air conditioner is controlled to send a freezing reminder to the user, so as to remind the user to clean the filter screen and check the amount of refrigerant in the air conditioner.

On the other hand, the present invention also provides an air conditioner, which includes a controller, the controller includes a processor and a memory, the memory stores a computer program, and the computer program is used to realize According to the control method described in any one of the above.

In the control method of the present invention, the antifreeze program includes the first antifreeze mode and the second antifreeze mode. When the adjustment items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the indoor fan speed of the air conditioner, reducing The speed of the outdoor fan of the air conditioner and the opening of the expansion valve of the air conditioner are increased, and the second antifreeze mode includes controlling the frequency reduction of the compressor of the air conditioner until it stops. Run the first antifreeze mode first, and start the second antifreeze mode after the adjustment target is achieved. After two adjustments, the goal of anti-freezing is gradually achieved, and the time for frequency reduction and shutdown is shortened, avoiding large fluctuations in indoor temperature caused by direct frequency reduction or shutdown of the compressor.

Furthermore, in the control method of the present invention, a variety of control items are designed for the first antifreeze mode, and each control item is run in a preset order during specific control. If the control parameter of the control item in the front order is adjusted to the limit value, the surface temperature Tr no longer meets the opening condition of the first antifreeze mode, and it is determined that the adjustment target is reached (then enters the second antifreeze mode), otherwise enter the next control item ; The last control item in the order makes the surface temperature Tr no longer satisfy the opening condition of the first antifreeze mode, or the control parameter is adjusted to the limit value, and it is determined that the regulation target is achieved (then enters the second antifreeze mode). In this way, the number of activated control items can be reduced as much as possible, and large temperature fluctuations can be avoided as much as possible.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

FIG. 1 is a schematic diagram of a circulation system of an air conditioner according to an embodiment of the present invention;

Fig. 2 is a schematic block diagram of an air conditioner according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an indoor unit of an air conditioner according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of an air conditioner control method according to an embodiment of the present invention;

Fig. 5 is a flowchart of an air conditioner control method according to an embodiment of the present invention;

Fig. 6 is a flowchart of an air conditioner control method according to another embodiment of the present invention.

Detailed ways

An air conditioner and a control method thereof according to an embodiment of the present invention will be described below with reference to FIG. 1 to FIG. 6 .

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, a portion of a program segment, or an instruction that includes one or more Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified function or action , or may be implemented by a combination of dedicated hardware and computer instructions.

The flowcharts provided in the present embodiments are not intended to indicate that the operations of the methods will be performed in any particular order, or that all operations of the methods are included in every instance. Additionally, the methods may include additional operations. Within the scope of the technical idea provided by the method of this embodiment, additional changes can be made to the above method.

It should be noted that the logic and/or steps shown in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, apparatus, or device and execute instructions), or in combination with these Instructions are used to execute systems, devices, or equipment.

Embodiments of the present invention provide an air conditioner in one aspect. The air conditioner is used to regulate indoor air, including regulating air temperature, humidity, air quality, humidifying and dehumidifying indoor air, introducing fresh air, and the like. The air conditioner in the embodiment of the present invention may be a household air conditioner or a central air conditioner. Specifically, the specific form of the air conditioner can be various forms such as split wall-mounted type, split vertical type, integral type, and patio type. The embodiment of the present invention has no limitation on the specific form of the air conditioner.

Fig. 1 is a schematic diagram of the circulation system of an air conditioner according to an embodiment of the present invention; Fig. 2 is a schematic block diagram of an air conditioner according to an embodiment of the present invention; Fig. 3 is a schematic structural diagram of an indoor unit of an air conditioner according to an embodiment of the present invention .

As shown in Figure 1, the air conditioner of the embodiment of the present invention consists of an evaporator 72, a condenser 74, a compressor 71, an expansion valve 73 and other necessary components to form a vapor compression refrigeration cycle system to output cold/hot air through the indoor fan 30, Realize the cooling and heating of the indoor environment.

As shown in FIG. 2 , the wall-mounted air conditioner indoor unit according to the embodiment of the present invention further includes a controller 800 . The controller 800 includes a processor 810 and a memory 820. The memory 820 stores a computer program 821. When the computer program 821 is executed by the processor 810, it is used to implement the air conditioner control method in any of the following embodiments of the present invention.

The processor 810 may be a central processing unit (central processing unit, CPU for short), or a digital processing unit, or the like. The processor 810 sends and receives data through the communication interface. The memory 820 is used to store programs executed by the processor 810 . The memory 820 is any medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, and can also be a combination of multiple memories 820 . The above-mentioned computer program 821 can be downloaded from a computer-readable storage medium to a corresponding computing/processing device or downloaded and installed to the controller 800 via a network (such as the Internet, a local area network, a wide area network and/or a wireless network).

Fig. 3 schematically shows an indoor unit of a split wall-mounted air conditioner. As shown in FIG. 3 , the indoor unit of the air conditioner includes a housing 10 , and the housing 10 defines an accommodating space for accommodating main components of the indoor unit, including the evaporator 72 , the indoor fan 30 and so on. The lower front side of the casing 10 is provided with an indoor air outlet 12 for blowing out heat exchanging air. The top of the housing 10 may be provided with an indoor air inlet 11 for inhaling indoor air. An air duct 15 is defined inside the housing 10 , and the outlet of the air duct 15 communicates with the indoor air outlet 12 . The indoor fan 30 is arranged in the casing 10, and is used to blow the conditioned air in the casing 10 out of the indoor air outlet 12 through the air duct 15, so as to adjust the indoor air. The regulated airflow is, for example, heat exchange airflow (cold airflow, hot airflow), purification airflow, humidification airflow, fresh air flow and the like.

The air conditioner also includes an outdoor fan 90 . The outdoor fan 90 is used to realize forced convection heat exchange between the outdoor air and the condenser 74 during operation. For the split air conditioner, the outdoor fan 90 is arranged in the outdoor unit of the air conditioner. A condenser 74 and a compressor 71 are also arranged in the outdoor unit.

Another aspect of the embodiments of the present invention provides an air conditioner control method. During the operation of the air conditioner, the surface temperature of the evaporator 72 is often too low due to various factors such as low air intake temperature and insufficient refrigerant circulation, until freezing occurs, which is called evaporator freezing, and evaporator freezing will lead to water leakage and water blowing , blowing ice and other adverse consequences. The control method of the embodiment of the present invention is to prevent and eliminate the freezing of the evaporator.

Fig. 4 is a schematic diagram of an air conditioner control method according to an embodiment of the present invention.

As shown in FIG. 4 , the control method of the air conditioner according to the embodiment of the present invention may generally include the following steps:

Step S402: Obtain the surface temperature Tr of the evaporator 72 of the air conditioner. As shown in FIG. 2 , the air conditioner may include a temperature detection device 80 for detecting the surface temperature Tr of the evaporator 72 . The temperature detection device 80 can be a temperature sensor.

Step S404: If the surface temperature Tr satisfies the activation condition of the first antifreeze mode, activate the first antifreeze mode. The control items of the aforementioned first antifreeze mode include increasing the air outlet area of the indoor air outlet 12 of the air conditioner, increasing the speed of the indoor fan 30 of the air conditioner, reducing the speed of the outdoor fan 90 of the air conditioner, and increasing the opening degree of the expansion valve 73 of the air conditioner. one or more of .

For example, the condition that the surface temperature Tr satisfies the activation condition of the first antifreeze mode includes: Tr≤T1, where T1 is a preset freezing protection temperature. When Tr≤T1, it is considered that the evaporator 72 has a greater risk of freezing or may have started to freeze. The critical temperature at which the evaporator 72 is about to freeze can be determined based on multiple experiments to reasonably determine the value of T1. For example, T1 can be 0°C, 1°C, 2°C and so on.

The goal of the first anti-freezing mode is to delay the freezing process of the evaporator 72, or to eliminate part of the freezing, but during the operation of the first anti-freezing mode, avoid reducing the frequency of the compressor 71 or even shutting down, so as to avoid large fluctuations in the indoor temperature .

Step S406: After the first anti-freezing mode reaches the adjustment target, start the second anti-freezing mode.

Specifically, the second antifreeze mode includes: controlling the frequency reduction of the compressor 71 of the air conditioner until it stops, so that the air conditioner stops cooling. Due to the addition of the first antifreeze mode (equivalent to the antifreeze pretreatment process), the process of the second antifreeze mode (equivalent to the antifreeze main process) is faster, that is, the time for compressor 71 to be reduced in frequency and shut down is shorter, so that There is less time for room temperature fluctuations. and,

In addition, after the first anti-freezing mode achieves the adjustment target, the controller 800 can also control the air conditioner to send a freeze reminder to the user to remind the user to clean the filter and check the amount of refrigerant. The reminder may be displaying prompt information, turning on a warning light, and the like. The inventor realized that the main reasons for the freezing of the evaporator are as follows: the air inlet temperature of the indoor unit is low; the throttling is severe, and the flow distribution is uneven due to insufficient refrigerant circulation; the indoor fan speed is low, and the indoor circulating air volume is low; The high speed of the fan causes excessive heat exchange in the condenser, and the filter layer on the indoor side is dirty and blocked. Based on the above knowledge, the embodiments of the present invention design the above four adjustment items especially in the first antifreeze mode.

In some embodiments, in the first antifreeze mode, the air conditioner can select one of the above four items according to experimental results, which is called "single item adjustment mode".

Referring to FIG. 5, the optimal control process based on the above-mentioned "single-item adjustment mode" will be introduced below.

Fig. 5 is a flowchart of an air conditioner control method according to an embodiment of the present invention.

As shown in FIG. 5 , the air conditioner control method in one embodiment of the present invention performs the following steps in sequence:

Step S502: The air conditioner runs in cooling mode.

Step S504: Obtain the surface temperature Tr of the evaporator 72 of the air conditioner.

Step S506: Determine whether the surface temperature Tr satisfies the condition for starting the first antifreeze mode. If yes, execute step S508, otherwise continue to execute step S502 to make the air conditioner continue cooling operation.

Step S508: Turn on the first antifreeze mode. That is, increase the air outlet area of the indoor air outlet 12 of the air conditioner, increase the speed of the indoor fan 30 of the air conditioner, decrease the speed of the outdoor fan 90 or increase the opening of the expansion valve 73 of the air conditioner, only one of them is executed.

Step S510: Determine whether Tr no longer satisfies the activation condition of the first antifreeze mode, or whether the control parameter of the control item has been adjusted to the limit value. If yes, execute step S512, otherwise continue to execute step S508.

Step S512: Start the second antifreeze mode.

In the preceding steps, the adjustment target of the first antifreeze mode (hereinafter referred to as "adjustment target") is: the surface temperature Tr no longer satisfies the opening condition of the first antifreeze mode, or the control parameters of the control items have been adjusted to limit values. Of course, it can be understood that if the above-mentioned control items are already at their limit values before being regulated, it can be directly judged that the regulation target of the first antifreeze mode has been achieved.

For example, if the turn-on condition is set as Tr≦T1, "Tr no longer satisfies the first antifreeze mode turn-on condition" means Tr>T1.

When increasing the air outlet area of the indoor air outlet 12, if the air outlet area has been adjusted to the maximum, it indicates that the regulation parameter has been adjusted to the limit value. When increasing the rotational speed of the indoor fan 30 of the air conditioner, if the rotational speed has been adjusted to the maximum rotational speed and cannot be further increased, it indicates that the control parameter has been adjusted to the limit value. When increasing the opening degree of the expansion valve 73 of the air conditioner, if the opening degree has been adjusted to 100%, it indicates that the regulation parameter has been adjusted to the limit value.

As shown in FIG. 3 , the indoor unit of the air conditioner may include at least one wind deflector 51 , 52 for adjusting the air outlet area of the indoor air outlet 12 , and also has an upper and lower air outlet angle to guide the indoor air outlet 12 . As shown in FIG. 3 , there are two air deflectors, which are respectively an air deflector 51 and an air deflector 52 arranged up and down.

In the first antifreeze mode, the regulation strategy of at least one regulation item is: adjust the corresponding regulation parameters step by step until the regulation target is achieved. Preferably, each control item is adjusted step by step.

For example, when increasing the air outlet area of the indoor air outlet 12, if the air outlet area is already the largest, it is directly judged that the adjustment target is achieved. If the air outlet area is not the largest, the first step is to properly increase the air outlet area first, and then obtain Tr, if "Tr no longer meets the opening conditions of the first antifreeze mode", judge that the adjustment target is reached and stop the adjustment, otherwise start the second step adjustment. After the second step of adjustment, the Tr at this time is obtained again, and when it is judged that "Tr no longer satisfies the opening condition of the first antifreeze mode", it is judged that the adjustment target is reached and the adjustment is stopped, otherwise, the third step of adjustment is started. By analogy, until "Tr no longer satisfies the opening condition of the first anti-freezing mode", or the air outlet area has reached the maximum and cannot be further adjusted.

When increasing the rotational speed of the indoor fan 30 of the air conditioner, if the rotational speed is already the maximum, it is directly judged that the adjustment target is achieved. If the rotational speed is not the maximum, the first step can be to increase the rotational speed appropriately, and then obtain Tr, if "Tr no longer satisfies the opening condition of the first antifreeze mode", judge that the adjustment target is reached and stop the adjustment, otherwise start the second step of adjustment. After the second step of adjustment, the Tr at this time is obtained again, and when it is judged that "Tr no longer satisfies the opening condition of the first antifreeze mode", it is judged that the adjustment target is reached and the speed adjustment is stopped, otherwise, the third step of adjustment is started. By analogy, until "Tr no longer satisfies the opening condition of the first antifreeze mode", or the rotational speed has reached the maximum and cannot be further adjusted.

When reducing the rotational speed of the outdoor fan 90 of the air conditioner, if the rotational speed is already the minimum, it is directly determined that the adjustment target is achieved. If the rotational speed is not the minimum, the first step may be to properly reduce the rotational speed, and then obtain Tr, if "Tr no longer satisfies the opening condition of the first antifreeze mode", then judge that the adjustment target is reached and stop the adjustment, otherwise start the second step of adjustment. After the second step of adjustment, the Tr at this time is obtained again, and when it is judged that "Tr no longer satisfies the opening condition of the first antifreeze mode", it is judged that the adjustment target is reached and the speed adjustment is stopped, otherwise, the third step of adjustment is started. By analogy, until "Tr no longer satisfies the opening condition of the first antifreeze mode", or the rotational speed is already minimum and cannot be further adjusted.

When increasing the opening degree of the expansion valve 73 of the air conditioner, if the opening degree is already the maximum, it is directly judged that the adjustment target is achieved. If the opening is not the largest, the first step can be to increase the opening appropriately, and then obtain Tr, if "Tr no longer meets the opening conditions of the first antifreeze mode", then judge that the adjustment target is reached and stop the adjustment, otherwise start the second step of adjustment . After the second step of adjustment, the Tr at this time is obtained again, and when it is judged that "Tr no longer satisfies the opening condition of the first antifreeze mode", it is judged that the adjustment target is reached and the adjustment of the opening degree is stopped, otherwise, the third step of adjustment is started. By analogy, until "Tr no longer satisfies the opening condition of the first anti-freezing mode", or the opening degree has reached the maximum and cannot be further adjusted.

In some embodiments, the adjustment items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet 12 of the air conditioner, increasing the speed of the indoor fan 30 of the air conditioner, reducing the speed of the outdoor fan 90, and increasing the expansion valve 73 of the air conditioner. Multiple entries in the opening. For example any two or three of them, or all four of them.

In the first antifreeze mode, run each control item in the preset order. If the control parameters of the control items in the first order are adjusted before the limit value, so that the surface temperature Tr no longer meets the opening conditions of the first antifreeze mode, it is determined that the adjustment is achieved. target, otherwise go to the next control item. The regulation item at the end of the sequence makes the surface temperature Tr no longer satisfy the opening condition of the first antifreeze mode, or the regulation parameter is adjusted to the limit value, and it is determined that the regulation goal is achieved.

For example, the first antifreeze mode can adopt all four control items, and the execution sequence of the control items is from front to back: first increase the air outlet area of the indoor air outlet 12 of the air conditioner, and then increase the speed of the indoor fan 30 of the air conditioner , then reduce the speed of the outdoor fan 90, and finally increase the opening of the expansion valve 73 of the air conditioner. The control scheme of this embodiment will be described below with reference to FIG. 6 .

Fig. 6 is a flowchart of an air conditioner control method according to another embodiment of the present invention.

Step S602: The air conditioner runs in cooling mode.

Step S604: Obtain the surface temperature Tr of the evaporator 72 of the air conditioner.

Step S606: Determine whether the surface temperature Tr satisfies the condition for starting the first antifreeze mode. If yes, execute step S608, otherwise continue to execute step S602 to make the air conditioner continue cooling operation.

Step S608: increasing the air outlet area of the indoor air outlet 12 step by step.

Step S610: Determine whether "Tr no longer satisfies the activation condition of the first antifreeze mode before the air outlet area is adjusted to the maximum value" is true, and if so, perform step S622: control the frequency reduction of the compressor 71 until it stops and send a freezing reminder to the user. If not, execute step S612.

Step S612: Increase the speed of the indoor fan 30 step by step.

Step S614: Determine whether "Tr no longer satisfies the first antifreeze mode opening condition before the indoor fan speed is adjusted to the maximum value" is true, and if execute Step S622: Control the frequency reduction of the compressor 71 until it stops and send a freezing reminder to the user, execute Step S614: S616.

Step S616: Decrease the rotation speed of the outdoor fan 90 step by step.

Step S618: Determine whether "before the speed of the outdoor fan is adjusted to the minimum value, Tr no longer satisfies the opening condition of the first antifreeze mode" is true, and if it is true, perform step S622: control the frequency reduction of the compressor 71 until it stops and send a freezing reminder to the user, and perform step S618: S620.

Step S620: Increase the opening of the expansion valve 73 until Tr no longer satisfies the opening condition of the first antifreeze mode, or the opening of the expansion valve 73 is adjusted to a maximum value.

Step S622: Control the frequency reduction of the compressor 71 until it stops, and send a freezing reminder to the user, so as to remind the user to clean the filter and check the amount of refrigerant in the air conditioner. The reminder may be displaying prompt information, turning on a warning light, and the like.

The antifreeze program in the embodiment of the present invention includes the first antifreeze mode and the second antifreeze mode. When the control items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet 12 of the air conditioner, increasing the speed of the indoor fan 30 of the air conditioner, reducing The speed of the outdoor fan 90 and the opening degree of the expansion valve 73 of the air conditioner are increased, and the second antifreeze mode includes controlling the frequency reduction of the compressor 71 of the air conditioner until it stops. Run the first antifreeze mode first, and start the second antifreeze mode after the adjustment target is achieved. After two adjustments, the goal of anti-freezing is gradually achieved, avoiding large fluctuations in the indoor temperature caused by directly reducing the frequency or shutting down the compressor 71 by a large margin.

In specific control, each control item is run in the preset order. If the control parameter of the control item in the front order is adjusted to the limit value, the surface temperature Tr no longer meets the opening condition of the first antifreeze mode, and it is determined that the adjustment target is reached (then enters the second antifreeze mode), otherwise enter the next control item ; The last control item in the order makes the surface temperature Tr no longer satisfy the opening condition of the first antifreeze mode, or the control parameter is adjusted to the limit value, and it is determined that the regulation target is achieved (then enters the second antifreeze mode). In this way, the control items can be reduced as much as possible, and large temperature fluctuations can be avoided as much as possible.

In some other embodiments, in the first antifreeze mode, each control item is executed at the same time; when the surface temperature Tr no longer satisfies the first antifreeze mode activation condition, or the control parameters of each control item have been adjusted to the limit value, Then it is determined that the adjustment target is achieved.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A control method for an air conditioner, comprising: Obtain the surface temperature Tr of the evaporator of the air conditioner; If the surface temperature Tr satisfies the opening condition of the first antifreeze mode, the first antifreeze mode is turned on; the control items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the One or more of the speed of the indoor fan, reducing the speed of the outdoor fan of the air conditioner, and increasing the opening of the expansion valve of the air conditioner; After the first anti-freezing mode reaches the adjustment target, the second anti-freezing mode is started. 2. The control method according to claim 1, wherein The adjustment target is: the surface temperature Tr no longer satisfies the activation condition of the first antifreeze mode, or the adjustment parameter of the adjustment item has been adjusted to a limit value. 3. The control method according to claim 2, wherein The regulation strategy of at least one regulation item is: adjust the corresponding regulation parameters step by step until the regulation target is achieved. 4. The control method according to claim 1, wherein The control items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the speed of the indoor fan of the air conditioner, reducing the speed of the outdoor fan of the air conditioner, and increasing the expansion valve of the air conditioner. Multiple items in the opening; In the first antifreeze mode, run each of the control items in a preset order; and If the surface temperature Tr no longer satisfies the opening condition of the first antifreeze mode before the control parameter of the control item in the first order is adjusted to the limit value, it is determined that the adjustment target is achieved, otherwise enter the next control item; The regulation item at the end of the sequence makes the surface temperature Tr no longer satisfy the activation condition of the first antifreeze mode, or the regulation parameter is adjusted to a limit value, and it is determined that the regulation target is achieved. 5. The control method according to claim 4, wherein The execution sequence of the control items of the first antifreeze mode is as follows from front to back: increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the speed of the indoor fan of the air conditioner, reducing the speed of the outdoor fan of the air conditioner, Increase the opening of the expansion valve of the air conditioner. 6. The control method according to claim 4, wherein The control items of the first antifreeze mode include increasing the air outlet area of the indoor air outlet of the air conditioner, increasing the speed of the indoor fan of the air conditioner, reducing the speed of the outdoor fan of the air conditioner, and increasing the expansion valve of the air conditioner. Multiple items in the opening; Under the first anti-freezing mode, execute each control item at the same time; When the surface temperature Tr no longer satisfies the condition for starting the first antifreeze mode, or the control parameters of each control item have been adjusted to a limit value, it is determined that the adjustment target is achieved. 7. The control method according to claim 1, wherein The condition that the surface temperature Tr satisfies the activation of the first antifreeze mode includes: Tr≤T1, where T1 is a preset freezing protection temperature. 8. The control method according to claim 1, wherein The second antifreeze mode includes: controlling the frequency reduction of the compressor of the air conditioner until it stops. 9. The control method according to claim 1, further comprising: After the first anti-freezing mode achieves the adjustment target, the air conditioner is controlled to send a freezing reminder to the user, so as to remind the user to clean the filter screen and check the amount of refrigerant in the air conditioner. 10. An air conditioner, which includes a controller, the controller includes a processor and a memory, the memory stores a computer program, and when the computer program is executed by the processor, it is used to implement the air conditioner according to claims 1 to 9 Any one of the control methods.

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