WO2022222545A1

WO2022222545A1 - Defrosting control method, storage medium, and air conditioner

Info

Publication number: WO2022222545A1
Application number: PCT/CN2021/143681
Authority: WO
Inventors: 马超
Original assignee: 美的集团武汉暖通设备有限公司; 广东美的制冷设备有限公司
Priority date: 2021-04-23
Filing date: 2021-12-31
Publication date: 2022-10-27
Also published as: CN115235044A

Abstract

Embodiments of the present application provide a defrosting control method, a storage medium, and an air conditioner. The defrosting control method comprises: accumulating the operation time of a compressor in a heating mode to obtain accumulated operation time; before the accumulated operation time satisfies a first preset condition, if an outdoor unit is switched from the heating mode to a shutdown mode, stopping accumulating the operation time, and keeping the accumulated operation time, and if the outdoor unit is switched from the shutdown mode to the heating mode, continuing to accumulate the operation time; and if the accumulated operation time satisfies the first preset condition, performing first defrosting determination, and if a determination result for confirming defrosting is generated, controlling the outdoor unit to be switched to a defrosting mode.

Description

Defrost control method, storage medium and air conditioner

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202110443906.0 and the filing date of April 23, 2021, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is incorporated herein by reference.

technical field

The present application relates to the technical field of air conditioners, and in particular, to a defrost control method, a storage medium and an air conditioner.

Background technique

In the related art, there is an air conditioner using a non-communication solution that is controlled by a thermostat. However, such an air conditioner has the problem that it is difficult to automatically switch to the defrosting mode, which results in a relatively poor defrosting effect of the outdoor unit. Difference.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present application are expected to provide a defrost control method, a storage medium, and an air conditioner capable of improving the defrost effect of an outdoor unit.

In order to achieve the above object, a first aspect of the embodiments of the present application provides a defrosting control method for an outdoor unit of an air conditioner, the control method comprising:

In the heating mode, the running time of the compressor is accumulated to obtain the accumulated running time;

Before the accumulated running time satisfies the first preset condition, if the outdoor unit is switched from the heating mode to the shutdown mode, the accumulation of the running time is stopped, and the accumulated running time is retained. When the outdoor unit is switched from the shutdown mode to the heating mode, the running time continues to be accumulated;

If the accumulated running time satisfies the first preset condition, a first defrosting judgment is performed, and if a judgment result confirming defrosting is generated according to the first defrosting judgment, the outdoor unit is controlled to switch to defrosting model.

In one embodiment, before the accumulated running time satisfies the first preset condition, if the outdoor unit is switched to the cooling mode, the accumulated running time is cleared to zero.

In one embodiment, the shutdown mode includes a temperature shutdown mode and a shutdown shutdown mode.

In one embodiment, the first preset condition is: the accumulated running time is greater than the preset duration; or, the accumulated running time is equal to the preset duration.

In one embodiment, before the accumulated running time satisfies the first preset condition, if the outdoor unit is switched from the heating mode to the shutdown mode, the running time is stopped from accumulating and reserved. The accumulated running time, if the outdoor unit is switched from the shutdown mode to the heating mode, continue to accumulate the running time, specifically:

Before the accumulated running time satisfies the first preset condition, if a shutdown signal is received, the outdoor unit is controlled to switch from the heating mode to the shutdown mode, and the accumulation of the running time is stopped, and keep the accumulated running time; in the shutdown mode, if the heating signal is received, control the outdoor unit to switch from the shutdown mode to the heating mode, and continue to monitor the running time Accumulate.

In one embodiment, the control method is specifically:

In the heating mode, the compressor control signal and the four-way valve control signal are continuously received, the compressor is in a running state, and the four-way valve is in a power-on state;

Before the accumulated running time satisfies the first preset condition, if the compressor control signal and the four-way valve control signal are not received, the compressor is controlled to stop, and the four-way valve is controlled to turn off electricity, stop accumulating the running time, and keep the accumulated running time; if the compressor control signal and the four-way valve control signal are received, the compressor will be controlled to run, and the four-way valve will be controlled. The valve is powered up and continues to accumulate said run time; or,

Before the accumulated running time satisfies the first preset condition, if the control signal of the four-way valve is received and the control signal of the compressor is not received, the compressor is controlled to stop, and the four-way valve is controlled to remain in the power-on state , stop accumulating the running time, and keep the accumulated running time; if receiving the compressor control signal and the four-way valve control signal, control the compressor to run and control the four-way valve Remains powered on and continues to accumulate the run time.

In one embodiment, the control method further includes:

Before the accumulated operation time meets the first preset condition, if a cooling signal is received, the outdoor unit is controlled to switch to the cooling mode, and the accumulated operation time is cleared to zero.

In one embodiment, the first defrosting judgment is performed, specifically:

Acquiring the average tube temperature of the outdoor heat exchanger in a preset time period in the heating mode and the first current tube temperature of the outdoor heat exchanger, where the preset time period is when the accumulated running time satisfies the time period before the first preset condition;

calculating the difference between the first current tube temperature and the average tube temperature to obtain the drop temperature difference of the tube temperature;

If the pipe temperature drop temperature difference satisfies a second preset condition, the determination result for determining defrosting is generated, wherein the second preset condition is: the pipe temperature drop temperature difference is greater than the first preset temperature; or , the drop temperature difference of the pipe temperature is equal to the first preset temperature.

In one embodiment, the first defrosting judgment is performed, specifically:

Obtain the tube temperature of the outdoor heat exchanger at a third time point in the heating mode and the first current tube temperature of the outdoor heat exchanger, where the third time point is when the cumulative operation time meets all requirements. the time point before the first preset condition;

calculating the difference between the first current tube temperature and the tube temperature of the outdoor heat exchanger at the third time point to obtain a tube temperature drop temperature difference;

In one embodiment, if a judgment result of no defrosting is generated according to the first defrosting judgment, the control method further includes:

continue to accumulate the running time of the compressor in the heating mode;

Every time the accumulated running time increases by K minutes, a second defrosting judgment is performed until a judgment result confirming the defrosting is generated or the accumulated running time is cleared, wherein K is greater than 0;

If a determination result determining defrosting is generated, the outdoor unit is controlled to switch to a defrosting mode.

In one embodiment, the judgment of the second defrosting is specifically:

obtaining the second current tube temperature of the outdoor heat exchanger;

If the second current pipe temperature satisfies a third preset condition, a judgment result for determining defrosting is generated, wherein the third preset condition is: the second current pipe temperature is greater than the second preset temperature; or , the second current tube temperature is equal to the second preset temperature.

A second aspect of the embodiments of the present application provides a storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the above-mentioned defrosting control method are implemented.

A third aspect of the embodiments of the present application provides an air conditioner, including an indoor unit, an outdoor unit, a thermostat, a processor, and a memory for storing a computer program that can run on the processor, the outdoor unit includes In the compressor, the four-way valve and the indoor heat exchanger, when the processor is used for running a computer program, it executes the steps of the defrosting control method described in the above claims.

Embodiments of the present application provide a defrost control method, a storage medium, and an air conditioner, wherein the defrost control method is that before the cumulative running time of the compressor satisfies the first preset condition, that is, before the first defrost judgment is performed, When switching from the heating mode to the stop mode, the accumulation of the running time is stopped and the accumulated running time is retained. When the outdoor unit is switched from the stop mode to the heating mode, the running time is continued to be accumulated. The accumulative running time of the compressor is reset to zero by mistake, which makes it difficult for the outdoor unit to perform the first defrost judgment, so as to ensure that the air conditioner can smoothly switch to the defrost mode when defrosting is required, thereby improving the defrost of the outdoor unit. Effect.

Description of drawings

1 is a schematic structural diagram of an air conditioner according to an embodiment of the present application;

Fig. 2 is a method schematic diagram of an embodiment of a defrosting control method provided by the application;

3 is a schematic diagram of an embodiment of a method for determining a first defrost provided by the present application;

4 is a schematic diagram of another embodiment of a method for determining the first defrost provided by the application;

5 is a method schematic diagram of another embodiment of the defrosting control method provided by the application;

FIG. 6 is a schematic diagram of an embodiment of a method for determining the second defrost provided by the present application.

Detailed ways

It should be noted that the embodiments in this application and the technical features in the embodiments can be combined with each other without conflict. Improper restrictions on this application.

The air conditioner described in this application refers to an air conditioner that adopts a non-communication scheme. Please refer to FIG. 1. The non-communication scheme refers to no communication or less communication between the indoor unit 30 and the outdoor unit 20, and is mainly controlled by temperature control. It is a communication scheme in which the controller 10 sends control signals to the indoor unit 30 and the outdoor unit 20 respectively.

An embodiment of the present application provides a defrosting control method for an outdoor unit of an air conditioner. Please refer to FIG. 2 . The defrosting control method includes the following steps:

Step S101: in the heating mode, the running time of the compressor is accumulated to obtain the accumulated running time;

Step S102: Before the accumulated running time satisfies the first preset condition, if the outdoor unit is switched from the heating mode to the shutdown mode, the accumulation of the running time is stopped and the accumulated running time is retained. In hot mode, the running time will continue to be accumulated;

Step S103: If the accumulated running time satisfies the first preset condition, perform a first defrost judgment, and if a judgment result confirming the defrost is generated according to the first defrost judgment, control the outdoor unit to switch to the defrost mode.

Specifically, before the accumulated running time satisfies the first preset condition, if the outdoor unit is always in the heating mode, the running time of the compressor will be accumulated all the time, and if the accumulated running time satisfies the first preset condition, the first Frost judgment; if the outdoor unit is switched from heating mode to shutdown mode, it will stop accumulating the running time of the compressor, and at the same time, keep the accumulated running time, that is, the accumulated running time will not be cleared. After the outdoor unit is switched to the shutdown mode, if the outdoor unit is switched from the shutdown mode to the heating mode again, the running time of the compressor will continue to be accumulated on the basis of the accumulated running time previously reserved. Before the accumulated running time satisfies the first preset condition, the outdoor unit can switch from the heating mode to the shutdown mode multiple times, and can also switch from the shutdown mode to the heating mode multiple times, but as long as the outdoor unit switches from the heating mode to the heating mode In shutdown mode, the accumulative running time of the compressor is stopped. At the same time, the accumulated running time is retained. When the outdoor unit is switched from the shutdown mode to the heating mode, the running time will continue to be calculated on the basis of the accumulated running time. Accumulation, if the accumulated running time satisfies the first preset condition, the first defrosting judgment is performed. If a judgment result confirming defrosting is generated according to the first defrosting judgment, the outdoor unit is controlled to switch to the defrosting mode.

An embodiment of the present application also provides an air conditioner, including an indoor unit, an outdoor unit, a thermostat, a processor, and a memory for storing a computer program that can be run on the processor, and the outdoor unit includes a compressor, a four-way Valve and indoor heat exchanger, when the processor is used to run the computer program, it executes the steps of the defrosting control method of any embodiment of the present application.

The processor and memory can be installed in the outdoor unit or in a separate switch box.

In the related art, an air conditioner using a non-communication scheme generally needs to accumulate the running time of the compressor before switching to the defrosting mode. And determine whether to switch the air conditioner to the defrosting mode according to the judgment result. The rule for accumulating the running time of the compressor is that if the outdoor unit receives a shutdown signal or switches to the cooling mode, the accumulated running time of the compressor is calculated. Clear to zero, otherwise, keep the accumulative running time of the compressor. The air conditioner using the non-communication solution also has a temperature shutdown mode. The temperature shutdown mode means that in the heating mode, if the indoor temperature reaches the set temperature, the thermostat will control the compressor to stop running, and wait for the indoor temperature to drop. After that, control the compressor to start again for heating. However, in the related art, if the indoor temperature reaches the set temperature, the thermostat will also send a shutdown signal to the outdoor unit. If the system receives the shutdown signal, it will consider that the outdoor unit has been shut down. According to the accumulation rule, the system will reset the accumulated running time of the compressor. If the air conditioner switches from the temperature shutdown mode to the heating mode, the running time of the compressor will be accumulated again. Since the thermostat will control the air conditioner to frequently switch to the temperature-at-temperature shutdown mode, the accumulated running time of the compressor may be mistakenly cleared before the first preset condition is met, which makes it difficult for the outdoor unit to enter the defrost judgment. , without entering the defrosting judgment, the system cannot determine whether the outdoor unit needs to be defrosted, so that it is difficult for the outdoor unit to automatically switch to the defrosting mode when defrosting is required, resulting in a relatively poor defrosting effect of the outdoor unit.

However, in the defrosting control method of the embodiment of the present application, before the cumulative running time of the compressor satisfies the first preset condition, that is, before the first defrosting judgment is made, if the outdoor unit is switched from the heating mode to the shutdown mode, the compressor will not be compressed. Therefore, for an air conditioner that adopts a non-communication scheme, the defrost control method of the embodiment of the present application can avoid mistakenly clearing the accumulated running time of the compressor, which makes it difficult for the outdoor unit to perform the first operation. Once the defrosting judgment occurs, it can be ensured that the air conditioner can smoothly switch to the defrosting mode when defrosting is required, thereby improving the defrosting effect of the outdoor unit.

It should be noted that the defrosting control method in the embodiment of the present application is mainly aimed at controlling the outdoor unit. Therefore, in the embodiment of the present application, various modes such as heating mode, cooling mode, shutdown mode, and defrosting mode are also mainly used. The description is for the outdoor unit, but it can be understood that if the outdoor unit is in a certain mode, the indoor unit must also be in the same mode, and any control method in the related art can be used to control the indoor unit. The control of the indoor unit does not fall within the protection scope of the embodiments of the present application. Therefore, the embodiments of the present application do not describe the control method of the indoor unit in detail.

The shutdown mode of the embodiment of the present application may include a temperature shutdown mode and a shutdown shutdown mode, wherein the shutdown shutdown mode is generally referred to as shutdown.

The first preset condition may be that the accumulated running time is greater than the preset duration, or may be that the accumulated running time is equal to the preset duration, namely H>H_heat1, where H is the accumulated running time and H_heat1 is the preset duration. The value of H_heat1 can be determined as required, for example, H_heat1 can be 20 minutes to 100 minutes.

In some embodiments, the first preset condition may also be other preset conditions.

In one embodiment, before the accumulated running time meets the first preset condition, if the outdoor unit is switched to the cooling mode, the accumulated running time is cleared to zero.

Specifically, the switching of the outdoor unit to the cooling mode described here includes not only switching the outdoor unit from the heating mode to the cooling mode, but also switching the outdoor unit from the shutdown mode to the cooling mode. In short, the accumulated operating time satisfies the first preset Before the conditions are met, as long as the outdoor unit switches to the cooling mode, the accumulated running time of the compressor can be reset to zero. If the outdoor unit switches from the cooling mode to the heating mode after the outdoor unit is switched to the cooling mode, the running time of the compressor is re-accumulated.

In some embodiments, before the accumulated running time meets the first preset condition, if the outdoor unit switches to the cooling mode, the accumulated running time may not be cleared, for example, when the outdoor unit switches from the heating mode to the cooling mode , you can stop accumulating the running time and keep the accumulated running time. When the outdoor unit switches from cooling mode to heating mode or shutdown mode, the accumulated running time can be reset, or, when the outdoor unit switches from heating mode When the outdoor unit is switched from the cooling mode to the heating mode or the shutdown mode, the accumulated running time retained by the outdoor unit in the shutdown mode can not be reset. Then reset the accumulated running time to zero.

In one embodiment, before the accumulated running time satisfies the first preset condition, if the outdoor unit is switched from the heating mode to the shutdown mode, the accumulation of the running time is stopped and the accumulated running time is retained. Switch from the shutdown mode to the heating mode, and continue to accumulate the running time, specifically:

Before the accumulated running time meets the first preset condition, if a shutdown signal is received, the outdoor unit will be controlled to switch from the heating mode to the shutdown mode, stop accumulating the running time, and keep the accumulated running time; in the shutdown mode, if After receiving the heating signal, the outdoor unit will be controlled to switch from the shutdown mode to the heating mode, and continue to accumulate the running time.

Specifically, the stop signal and the heating signal can be sent by the thermostat. The stop signal is not only a control signal to control the outdoor unit to switch to the stop mode, but also an indication signal to stop accumulating the running time and keep the accumulated running time. Similarly, the heating signal is not only a control signal for controlling the outdoor unit to switch to the heating mode, but also an instruction signal for continuing to accumulate the running time.

In some embodiments, the shutdown signal can also be used only to indicate that the accumulation of the running time is stopped, and the accumulated running time is retained. Control signal to control the outdoor unit to switch to shutdown mode or heating mode.

In one embodiment, the control method is specifically:

In the heating mode, the compressor control signal and the four-way valve control signal are continuously received, the compressor is in the running state, and the four-way valve is in the power-on state; before the accumulated running time meets the first preset condition, if no compression is received If the compressor control signal and the four-way valve control signal are received, the compressor will be stopped, the power of the four-way valve will be controlled, and the accumulation of the running time will be stopped, and the accumulated running time will be retained; if the compressor control signal and the four-way valve control signal are received, the Then control the compressor to run, control the power-on of the four-way valve, and continue to accumulate the running time.

Specifically, in the heating mode, the compressor control signal and the four-way valve control signal can be continuously sent by the thermostat. If the compressor control signal and the four-way valve control signal are not received, it means that the shutdown signal is received, and the compressor stops. , after the four-way valve is powered off, the outdoor unit switches from heating mode to shutdown mode. Similarly, receiving the compressor control signal and the four-way valve control signal indicates that the heating signal is received, and the compressor is controlled to operate according to the received compressor control signal and the four-way valve control signal. After the four-way valve is powered on, The outdoor unit switches from the shutdown mode to the heating mode, and continues to accumulate the running time.

In another embodiment, the control method is specifically:

In the heating mode, the compressor control signal and the four-way valve control signal are continuously received, the compressor is in the running state, and the four-way valve is in the power-on state; before the accumulated running time meets the first preset condition, if the four-way valve is received If the valve control signal is received and the compressor control signal is not received, the compressor is controlled to stop, the accumulation of running time is stopped, and the accumulated running time is retained; if the compressor control signal and the four-way valve control signal are received, the compressor is controlled to run , control the four-way valve to keep the power-on state, and continue to accumulate the running time.

Specifically, this control method is roughly the same as the previous one, except that the four-way valve control signal is received and the compressor control signal is not received, indicating that a shutdown signal is received. After the compressor is stopped, the four-way valve is still in the upper position. power state, at this time, the outdoor unit switches from heating mode to shutdown mode. Similarly, if the compressor control signal and the four-way valve control signal are received, it means that the heating signal is received, and the compressor operation is controlled according to the received compressor control signal. Since in the shutdown mode, the four-way valve remains on the upper Therefore, at this time, the four-way valve is still controlled to remain in the power-on state, the outdoor unit is switched from the shutdown mode to the heating mode, and the running time continues to be accumulated.

It should be noted that, if the outdoor unit is in the shutdown mode when the temperature is reached, depending on the setting method, the compressor can be in the shutdown state and the four-way valve is in a power-off state, or the compressor can be in the shutdown state and the four-way valve is powered on. state. If the outdoor unit is in shutdown mode, the compressor is generally in shutdown state and the four-way valve is in a power-off state.

In one embodiment, the control method further includes: before the accumulated running time satisfies the first preset condition, if a cooling signal is received, controlling the outdoor unit to switch to the cooling mode, and clearing the accumulated running time.

Specifically, the cooling signal can also be sent by the temperature controller, and the cooling signal is not only a control signal for controlling the outdoor unit to switch to the cooling mode, but also an indication signal for clearing the accumulated running time.

In one embodiment, before the accumulated running time meets the first preset condition, if the compressor control signal is received and the four-way valve control signal is not received, the accumulated running time is reset to zero. When the compressor control signal is received and the four-way valve control signal is not received, it means that the refrigeration signal is received, and the accumulated running time can be reset to zero.

It should be noted that, before the outdoor unit is switched to the cooling mode, if the outdoor unit is in the heating mode or in the temperature shutdown mode with the four-way valve powered on, the method for switching the outdoor unit to the cooling mode can be: If the compressor control signal is not received and the four-way valve control signal is not received, the compressor is controlled to restart and the four-way valve is controlled to be powered off. Before the outdoor unit is switched to the cooling mode, if the outdoor unit is in the shutdown mode, the method of switching the outdoor unit to the cooling mode may be: if the compressor control signal is received and the four-way valve control signal is not received, control the compression The machine starts, that is to say, only the compressor starts to run, and the four-way valve is not controlled to be powered on.

It can be understood that the shutdown signal, the heating signal and the cooling signal are not limited to be realized by whether the compressor control signal and the four-way valve control signal are received. In some embodiments, the shutdown signal, the heating signal and the cooling signal are all Other types of signals are possible.

In some embodiments, before the accumulated running time satisfies the first preset condition, the control method for controlling the outdoor unit to switch to the cooling mode and clearing the accumulated running time may also be: when the accumulated running time satisfies the first preset condition Before the condition, if the cooling signal is received, the outdoor unit will be controlled to switch to the cooling mode, and the accumulated running time will be cleared to zero. The refrigeration signal described here is other signal than the compressor control signal described above.

In one embodiment, referring to FIG. 3 , the first defrosting judgment is performed and a judgment result is generated, specifically:

Step S1031: Acquire the average tube temperature of the outdoor heat exchanger in a preset time period in the heating mode and the first current tube temperature of the outdoor heat exchanger, where the preset time period is when the accumulated running time satisfies the first preset condition the previous time period;

Specifically, the average tube temperature is an average value of tube temperatures of the outdoor heat exchanger measured within a preset time period, that is, the outdoor heat exchanger operates from the first time point to the second time point in the heating mode. The average value of the tube temperature for a period of time, wherein the first time point is less than the second time point. The first time point can be from the 2nd minute to the 15th minute after the outdoor unit is turned on in the heating mode. The difference between the second time point and the first time point can be greater than 0 minutes and less than or equal to 10 minutes, that is, 0 minutes <H0≤10 minutes, wherein, H0=H2-H1, H2 is the second time point, H1 is the first time point, and H0 is the difference between the second time point H2 and the first time point H1. For example, the first time point H1 may be equal to 7 minutes, and the difference H0 between the second time point H2 and the first time point H1 may be equal to 5 minutes, that is to say, the outdoor unit is turned on in the heating mode for 7 minutes to reach the first time point Point H1, start from the 7th minute, and continue to run for 5 minutes to reach the second time point H2, that is, the second time point H2 is equal to 12 minutes, and the 5 minutes from the first time point H1 to the second time point H2 is the pre-run time. Set the time period, and the average value of the tube temperature of the outdoor heat exchanger measured in the 5 minutes is the average tube temperature.

The first current tube temperature mainly reflects the current tube temperature of the outdoor heat exchanger. The first current tube temperature may be the last measured tube temperature of the outdoor heat exchanger before the first defrosting judgment, or it may be The tube temperature of the outdoor heat exchanger measured during the first defrost judgment.

Step S1032: Calculate the difference between the first current tube temperature and the average tube temperature to obtain the drop temperature difference of the tube temperature;

Step S1033: If the temperature difference between the pipe temperature drops meets the second preset condition, a judgment result for determining defrosting is generated, where the second preset condition is: the temperature difference between the pipe temperature drops is greater than the first preset temperature; or, the temperature difference between the pipe temperature drops equal to the first preset temperature.

Specifically, the above judgment condition can be expressed by the following relational formula:

T>T_heat1, or, T=T_heat1

Wherein, T is the temperature difference of the tube temperature drop, T=T1-T0, T1 is the first current tube temperature, T0 is the average tube temperature, and T_heat1 is the first preset temperature. The value of T_heat1 can be determined as required, for example, T_heat1 can be 1 degree to 5 degrees.

According to the judgment result of defrosting, the outdoor unit can be controlled to switch to defrosting mode, and the accumulated running time can be reset after defrosting.

In another embodiment, referring to FIG. 4 , the first defrosting judgment is performed and the judgment result is generated, which can also be:

Step S1031 ′: Obtain the tube temperature of the outdoor heat exchanger at a third time point in the heating mode and the first current tube temperature of the outdoor heat exchanger, where the third time point is when the accumulated running time satisfies the first preset condition previous point in time;

Specifically, the difference between this embodiment and the previous embodiment is that this embodiment obtains the pipe temperature at a third time point, not the average pipe temperature in a preset time period, and the third time point may be the outdoor unit to control the temperature. From the 2nd minute to the 15th minute after the heating mode is turned on, for example, the third time point can be equal to 7 minutes, then the tube temperature of the outdoor heat exchanger at the third time point in the heating mode is the outdoor unit to heat The tube temperature of the outdoor heat exchanger measured at the 7th minute after the mode is turned on.

Step S1032': Calculate the difference between the first current tube temperature and the tube temperature of the outdoor heat exchanger at the third time point to obtain the tube temperature drop temperature difference;

Step S1033': if the temperature difference between the pipe temperature drops and the temperature satisfies the second preset condition, a judgment result for determining defrosting is generated, where the second preset condition is: the temperature difference between the pipe temperature drops is greater than the first preset temperature; or, the pipe temperature drops The temperature difference is equal to the first preset temperature.

T'>T_heat1, or, T'=T_heat1

Wherein, T' is the temperature difference of the tube temperature drop, T'=T1-T3, T1 is the first current tube temperature, T3 is the tube temperature at the third time point, and T_heat1 is the first preset temperature. The value of T_heat1 can be determined as required, for example, T_heat1 can be 1 degree to 5 degrees.

In one embodiment, referring to FIG. 5 , if a judgment result of no defrosting is generated according to the first defrosting judgment, the control method further includes:

Step S104: Continue to accumulate the running time of the compressor in the heating mode;

Specifically, if the temperature difference of the pipe temperature drop does not meet the second preset condition, it means that defrosting of the outdoor unit is not currently required. Therefore, the running time of the compressor in the heating mode can continue to be accumulated in the previous accumulation method.

Step S105: Every time the accumulated running time increases by K minutes, a second defrosting judgment is performed until a judgment result confirming the defrosting is generated or the accumulated running time is cleared, wherein K is greater than 0.

That is to say, the second defrosting judgment may be performed every K minutes. For example, the cumulative running time is increased by K minutes, and the second defrosting judgment is performed. If the judgment result of no defrosting is generated according to the second defrosting judgment, then Continue to accumulate the running time of the compressor. When the accumulated running time increases by K minutes again, the second defrost judgment will be carried out. This cycle is repeated. When the mode is switched to the shutdown mode, the accumulation of the running time will be stopped, and the accumulated running time will be retained. After the outdoor unit switches from the shutdown mode to the heating mode, the running time will continue to be accumulated, that is, the method of step S102 is still performed until the According to the judgment result of the second defrost judgment, the cycle will be stopped, or the accumulated running time will be cleared, and the cycle will also be stopped. Switch to cooling mode, the accumulated running time is cleared, and the cycle will be stopped.

The value of K can be determined as required, for example, K can be 80 minutes to 380 minutes.

Step S106: If a determination result of determining defrosting is generated, control the outdoor unit to switch to a defrosting mode.

After defrosting, the accumulated running time can be reset to zero.

In one embodiment, please refer to FIG. 6 , the second defrosting judgment is specifically:

Step 1051: Obtain the second current tube temperature of the outdoor heat exchanger;

Specifically, the second current tube temperature may be the tube temperature of the outdoor heat exchanger measured when entering the second defrosting judgment, or may be the last time after the first defrosting judgment and before entering the second defrosting judgment. The measured tube temperature of the outdoor heat exchanger, or the earliest measured tube temperature of the outdoor heat exchanger after entering the second defrost judgment.

Step 1052: If the second current tube temperature satisfies a third preset condition, generate a judgment result for determining defrosting, where the third preset condition is: the second current tube temperature is greater than the second preset temperature; or, the second The current tube temperature is equal to the second preset temperature.

T2>T_heat2, or, T2=T_heat2

Wherein, T2 is the second current tube temperature, and T_heat2 is the second preset temperature. The value of T_heat2 can be determined as required, for example, T_heat2 can be -5 degrees to -25 degrees.

An embodiment of the present application further provides a storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the defrosting control method described in any embodiment of the present application are implemented.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application are included within the protection scope of this application.

Claims

A defrosting control method for an outdoor unit of an air conditioner, the control method comprising:

In the heating mode, the running time of the compressor is accumulated to obtain the accumulated running time;

Before the accumulated running time satisfies the first preset condition, if the outdoor unit is switched from the heating mode to the shutdown mode, the accumulation of the running time is stopped, and the accumulated running time is retained. When the outdoor unit is switched from the shutdown mode to the heating mode, the running time continues to be accumulated;

If the accumulated running time satisfies the first preset condition, a first defrosting judgment is performed, and if a judgment result confirming defrosting is generated according to the first defrosting judgment, the outdoor unit is controlled to switch to defrosting model.
According to the defrosting control method according to claim 1, before the accumulated operation time meets the first preset condition, if the outdoor unit is switched to a cooling mode, the accumulated operation time is cleared to zero.
According to the defrosting control method according to claim 1 or 2, the shutdown mode includes a temperature shutdown mode and a shutdown shutdown mode.
The defrosting control method according to claim 1 or 2, wherein the first preset condition is: the accumulated running time is greater than the preset duration; or, the accumulated running time is equal to the preset duration.
The defrosting control method according to claim 1, wherein before the accumulated operation time meets a first preset condition, if the outdoor unit is switched from the heating mode to the shutdown mode, the operation of the outdoor unit is stopped. Accumulate the time and keep the accumulated running time. If the outdoor unit switches from the shutdown mode to the heating mode, continue to accumulate the running time, specifically:

Before the accumulated running time satisfies the first preset condition, if a shutdown signal is received, the outdoor unit is controlled to switch from the heating mode to the shutdown mode, and the accumulation of the running time is stopped, and keep the accumulated running time; in the shutdown mode, if the heating signal is received, control the outdoor unit to switch from the shutdown mode to the heating mode, and continue to monitor the running time Accumulate.
The defrosting control method according to claim 5, the control method is specifically:

In the heating mode, the compressor control signal and the four-way valve control signal are continuously received, the compressor is in a running state, and the four-way valve is in a power-on state;

Before the accumulated running time satisfies the first preset condition, if the compressor control signal and the four-way valve control signal are not received, the compressor is controlled to stop, and the four-way valve is controlled to turn off electricity, stop accumulating the running time, and keep the accumulated running time; if the compressor control signal and the four-way valve control signal are received, the compressor will be controlled to run, and the four-way valve will be controlled. The valve is powered up and continues to accumulate said run time; or,

Before the accumulated running time satisfies the first preset condition, if the control signal of the four-way valve is received and the control signal of the compressor is not received, the compressor is controlled to stop, and the four-way valve is controlled to remain in the power-on state , stop accumulating the running time, and keep the accumulated running time; if receiving the compressor control signal and the four-way valve control signal, control the compressor to run and control the four-way valve Remains powered on and continues to accumulate the run time.
The defrosting control method according to claim 1, further comprising:

Before the accumulated operation time meets the first preset condition, if a cooling signal is received, the outdoor unit is controlled to switch to the cooling mode, and the accumulated operation time is cleared to zero.
The defrosting control method according to claim 1, wherein the first defrosting judgment is performed, specifically:

Acquiring the average tube temperature of the outdoor heat exchanger in a preset time period in the heating mode and the first current tube temperature of the outdoor heat exchanger, where the preset time period is when the accumulated running time satisfies the time period before the first preset condition;

calculating the difference between the first current tube temperature and the average tube temperature to obtain the drop temperature difference of the tube temperature;

If the pipe temperature drop temperature difference satisfies a second preset condition, the determination result for determining defrosting is generated, wherein the second preset condition is: the pipe temperature drop temperature difference is greater than the first preset temperature; or , the drop temperature difference of the pipe temperature is equal to the first preset temperature.
The defrosting control method according to claim 1, wherein the first defrosting judgment is performed, specifically:

Obtain the tube temperature of the outdoor heat exchanger at a third time point in the heating mode and the first current tube temperature of the outdoor heat exchanger, where the third time point is when the cumulative operation time meets all requirements. the time point before the first preset condition;

calculating the difference between the first current tube temperature and the tube temperature of the outdoor heat exchanger at the third time point to obtain a tube temperature drop temperature difference;

If the pipe temperature drop temperature difference satisfies a second preset condition, the determination result for determining defrosting is generated, wherein the second preset condition is: the pipe temperature drop temperature difference is greater than the first preset temperature; or , the drop temperature difference of the pipe temperature is equal to the first preset temperature.
The defrosting control method according to claim 1, if a judgment result of no defrosting is generated according to the first defrosting judgment, the control method further comprises:

continue to accumulate the running time of the compressor in the heating mode;

Every time the accumulated running time increases by K minutes, a second defrosting judgment is performed until a judgment result confirming the defrosting is generated or the accumulated running time is cleared, wherein K is greater than 0;

If a determination result determining defrosting is generated, the outdoor unit is controlled to switch to a defrosting mode.
The defrosting control method according to claim 10, the second defrosting judgment is specifically:

obtaining the second current tube temperature of the outdoor heat exchanger;

If the second current pipe temperature satisfies a third preset condition, a judgment result for determining defrosting is generated, wherein the third preset condition is: the second current pipe temperature is greater than the second preset temperature; or , the second current tube temperature is equal to the second preset temperature.
A storage medium, on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of the defrosting control method described in any one of claims 1-11.
An air conditioner includes an indoor unit, an outdoor unit, a thermostat, a processor, and a memory for storing a computer program that can run on the processor, the outdoor unit including a compressor, a four-way valve, and an indoor heat The exchanger, when the processor is configured to execute the steps of the defrosting control method according to any one of claims 1-11 when running a computer program.