Air conditioner defrosting control method, device, air conditioner, storage medium and program product

Abstract

The present invention discloses a control method, device, air conditioner, storage medium, and computer program product for air conditioner defrosting. The method comprises a heat dissipation component for dissipating heat from an inverter. The first end of the heat dissipation component is connected to the first end of an outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve. The second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. The first end of the outdoor heat exchanger is connected to a throttling component, and the second end is connected to a compressor. The method includes: during heating operation, controlling the opening and closing of the first and second solenoid valves based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger; then switching the air conditioner to cooling mode based on the outdoor heat exchanger temperature; and controlling the compressor frequency based on the compressor current change rate and the exhaust pressure change rate. This solution utilizes the heat generated by the inverter to defrost the outdoor heat exchanger, allowing the air conditioner to defrost while heating, thereby preventing the indoor heating from failing and affecting the user experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and in particular relates to a method and device for controlling air conditioner defrosting, an air conditioner, a storage medium, and a computer program product. Background Art

[0002] During heating operation, the outdoor unit's temperature is low, which can easily cause frost to form on the heat exchanger, reducing system performance. Therefore, the outdoor unit needs to be defrosted. Related solutions directly switch the air conditioner to cooling mode to defrost when the outdoor unit needs defrosting. However, indoor heating cannot be provided during the defrosting period, affecting the user experience.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The object of the present invention is to provide a control method, device, air conditioner, storage medium and computer program product for air conditioner defrosting, so as to solve the problem in related solutions that when the air conditioner outdoor unit needs to be defrosted, the air conditioner is directly controlled to switch to the cooling mode for defrosting, and the indoor heating cannot be performed during the defrosting period, which affects the user experience. The purpose of the present invention is to achieve the effect of utilizing the heat generated by the inverter to defrost the outdoor heat exchanger, so that the air conditioner can defrost while heating, avoiding the inability to heat the indoor room and affecting the user experience; and controlling the compressor frequency according to the current change rate and voltage change rate of the compressor during the defrosting process in the cooling mode, ensuring the stable operation of the air conditioner and improving the system efficiency.

[0005] The present invention provides a defrosting control method for an air conditioner, wherein the air conditioner includes an outdoor heat exchanger, a compressor, a throttling component, and a frequency converter; a heat dissipation component is provided at the frequency converter, and the heat dissipation component is used to dissipate heat for the frequency converter; a first end of the heat dissipation component is connected to a first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is also connected to a second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; the method comprises: when the air conditioner is running in a heating mode, The first solenoid valve is in a closed state and the second solenoid valve is in an open state, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor are obtained; the first solenoid valve is controlled to open and the second solenoid valve is controlled to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; after opening the first solenoid valve and closing the second solenoid valve, the air conditioner is controlled to switch to the cooling mode for defrosting according to the temperature of the outdoor heat exchanger; during the process of the air conditioner running in the cooling mode for defrosting, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate.

[0006] In some embodiments, the first solenoid valve is controlled to open and the second solenoid valve is controlled to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and a preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0007] In some embodiments, the air conditioner is controlled to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger, including: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to a cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0008] In some embodiments, the method further includes: after controlling the air conditioner to switch to the cooling mode, closing the first solenoid valve and opening the second solenoid valve.

[0009] In some embodiments, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate, including: judging the magnitude relationship between the current change rate and a preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the magnitude relationship between the exhaust pressure change rate and a preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0010] In accordance with the above method, the present invention provides a defrosting control device for an air conditioner, wherein the air conditioner comprises an outdoor heat exchanger, a compressor, a throttling component, and an inverter; a heat dissipation component is provided at the inverter, and the heat dissipation component is used to dissipate heat for the inverter; a first end of the heat dissipation component is connected to a first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is also connected to a second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; the device comprises: an acquisition unit, configured to, during the operation of the air conditioner in a heating mode, the first solenoid valve The valve is in a closed state and the second solenoid valve is in an open state, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor are obtained; a control unit is configured to control the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; the control unit is also configured to control the air conditioner to switch to the cooling mode for defrosting according to the temperature of the outdoor heat exchanger after opening the first solenoid valve and closing the second solenoid valve; the control unit is also configured to control the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate during the process of the air conditioner running in the cooling mode for defrosting.

[0011] In some embodiments, the control unit controls the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and the preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0012] In some embodiments, the control unit controls the air conditioner to switch to cooling mode for defrosting according to the temperature of the outdoor heat exchanger, including: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0013] In some embodiments, the control unit is further configured to close the first solenoid valve and open the second solenoid valve after controlling the air conditioner to switch to the cooling mode.

[0014] In some embodiments, the control unit controls the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate, including: judging the magnitude relationship between the current change rate and a preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the magnitude relationship between the exhaust pressure change rate and the preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0015] Matching the above device, the present invention further provides an air conditioner, comprising: the above air conditioner defrosting control device.

[0016] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioning defrosting control method.

[0017] In accordance with the above method, the present invention provides a computer program product on another aspect, wherein the computer program product includes a computer program, and when the computer program product is processed and executed, the steps of the above air conditioner defrosting control method are implemented.

[0018] The present invention provides a heat dissipation component for dissipating heat from an inverter. The first end of the heat dissipation component is connected to the first end of an outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. During heating operation, the first solenoid valve is closed and the second solenoid valve is opened. The opening and closing of the first solenoid valve and the second solenoid valve are controlled based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger. After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner switches to cooling mode for defrosting based on the outdoor heat exchanger temperature. During defrosting in cooling mode, the compressor operating frequency is controlled based on the current change rate and the exhaust pressure change rate. This allows the air conditioner to defrost the outdoor heat exchanger using heat generated by the inverter, allowing the air conditioner to defrost while heating, thus preventing indoor heating failure and affecting the user experience. Furthermore, during defrosting in cooling mode, the compressor frequency is controlled based on the current change rate and the voltage change rate, ensuring stable operation and improving system efficiency.

[0019] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic flow chart of an embodiment of a method for controlling air conditioner defrosting according to the present invention;

[0022] Figure 2 This is a structural schematic diagram of an embodiment of an air conditioner defrosting control device of the present invention;

[0023] Figure 3 is a system structure diagram of the air conditioner of the present invention;

[0024] Figure 4 The figure is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention.

[0025] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0026] 1- compressor; 2- four-way valve; 3- indoor heat exchanger; 4- throttling component; 5- outdoor heat exchanger; 6- heat dissipation component; 7- fan; 8- heat dissipation fins; 9- first solenoid valve; 10- second solenoid valve; 11- temperature detection module; 102- acquisition unit; 104- control unit. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] When the air conditioner is operating in heating mode, frost and snow easily form on the outdoor heat exchanger, reducing heating performance. To maintain heating capacity, the air conditioner needs to enter defrost mode as needed. During the defrost process, the unit switches from heating to cooling mode. To facilitate faster defrosting, the outdoor fan is turned off, causing the compressor current to continuously increase and the system exhaust pressure to continuously rise. If this is not properly controlled, it is very likely to trigger a protection trigger, reducing system reliability.

[0029] Therefore, the present invention provides a control method for air conditioner defrosting. This method fully utilizes the heat from the inverter's power devices to achieve defrosting. It also combines defrosting with the cooling mode, achieving controllable defrosting and improving user experience. By varying pressure and current, the defrosting process is intelligent, further improving system reliability and reducing failure rates.

[0030] According to an embodiment of the present invention, a method for controlling defrosting of an air conditioner is provided. The air conditioner includes an outdoor heat exchanger, a compressor, a throttling component, and an inverter. The inverter is provided with a heat dissipation component for dissipating heat from the inverter. A first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is further connected to the second end of the outdoor heat exchanger via a second solenoid valve. The second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. The first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor.

[0031] The system structure of air conditioning is as follows Figure 3As shown, the heat dissipation component 6 is a heat dissipation cold plate, which includes heat dissipation fins 8 and a fan 7. The outdoor heat exchanger 5 is a fin heat exchanger, the indoor heat exchanger 3 is a plate heat exchanger, and the throttling component 4 is an electronic expansion valve. In heating mode, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, the throttling component 4, the outdoor heat exchanger 5, and the four-way valve 2 in sequence before returning to the compressor. At the same time, a portion of the refrigerant flowing out of the throttling component 4 also flows to the heat dissipation component 6. At this time, controlling the opening and closing of the first solenoid valve 9 and the second solenoid valve 10 can change the path of the refrigerant flowing out of the heat dissipation component. When the first solenoid valve 9 is open, the refrigerant flowing out of the heat dissipation component 6 flows through the outdoor heat exchanger 5 to the four-way valve 2. When the second solenoid valve 10 is open, the refrigerant flowing out of the heat dissipation component 6 flows directly to the four-way valve 2.

[0032] In cooling mode, the high-temperature, high-pressure refrigerant discharged from compressor 1 passes through four-way valve 2, outdoor heat exchanger 5, throttling component 4, indoor heat exchanger 3, and four-way valve 2 in sequence before returning to the compressor. At the same time, a portion of the high-temperature, high-pressure refrigerant discharged from compressor 1 also passes through four-way valve 2 and second solenoid valve 10 before flowing to heat sink 6. At this time, first solenoid valve 9 is closed, and the refrigerant flowing out of heat sink 6 flows directly to throttling component 4.

[0033] During the operation of the air conditioner, the refrigerant can exchange heat with the heat dissipated by the inverter at the heat dissipation component. Since the temperature of the inverter is relatively high and higher than the temperature of the refrigerant discharged by the compressor, the temperature of the refrigerant increases after the heat exchange. In heating mode, if the first solenoid valve is opened, the heated refrigerant flows into the outdoor heat exchanger, increasing the temperature at the outdoor heat exchanger and preventing frost on the outdoor heat exchanger. In cooling mode, the refrigerant discharged by the compressor can be used to dissipate heat and cool the inverter, and can prevent the risk of condensation at the inverter (there is a risk of condensation when using low-temperature refrigerant to cool the inverter). The heat dissipation component is not limited to dissipating heat for the inverter, but can also dissipate heat and cool other components that can generate higher temperatures.

[0034] like Figure 1 FIG2 is a flow chart of an embodiment of the method of the present invention. The air conditioner defrosting control method may include steps S110 to S140.

[0035] At step S110, when the air conditioner is operating in heating mode, the first solenoid valve is closed and the second solenoid valve is open, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor are obtained.

[0036] In heating mode, the first solenoid valve is normally closed, and the second solenoid valve is normally open. The refrigerant flowing out of the electronic expansion valve is split into two paths: one path passes through the outdoor heat exchanger and returns to the compressor, while the other path passes through the heat sink and returns to the compressor. The temperature of the outdoor heat exchanger is detected by the temperature detection module 11.

[0037] The compressor current change rate can be calculated based on the current and previous compressor currents: Current change rate = (current current - previous current) / time interval. The compressor current represents the compressor's operating current. The compressor exhaust pressure change rate can be calculated based on the current and previous compressor exhaust pressures: Exhaust pressure change rate = (current exhaust pressure - previous exhaust pressure) / time interval. The outdoor heat exchanger temperature represents the surface temperature of the outdoor heat exchanger.

[0038] In step S120 , the first solenoid valve is controlled to open and the second solenoid valve is controlled to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, so as to increase the temperature of the outdoor heat exchanger and prevent frost on the outdoor heat exchanger.

[0039] In some embodiments, in step S120, the specific process of controlling the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger includes: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and the preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0040] The preset first temperature is used to determine whether frost is likely to form on the outdoor heat exchanger surface, and the preset second temperature is used to determine whether frost has already formed on the outdoor heat exchanger surface. When the outdoor ambient temperature is ≥ the preset first temperature, the outdoor heat exchanger is considered to be free of frost. When the outdoor ambient temperature is < the preset first temperature, it indicates that the outdoor temperature is low and the outdoor heat exchanger is prone to frost. In this case, the outdoor heat exchanger temperature is further used to determine whether frost has already formed. When the outdoor heat exchanger temperature is ≥ the preset second temperature, the outdoor heat exchanger is considered to be free of frost. When the outdoor heat exchanger temperature is < the preset second temperature, the outdoor heat exchanger is considered to be frosted and requires defrosting. The preset first temperature is greater than the preset second temperature.

[0041] When defrosting is determined to be necessary, the heat generated by the inverter is first used to defrost the outdoor heat exchanger. Specifically, the first solenoid valve is opened and the second solenoid valve is closed, allowing some refrigerant to be heated at the heat dissipation component before flowing into the outdoor heat exchanger. The heated refrigerant then flows into the outdoor heat exchanger, raising the temperature of the outdoor heat exchanger for defrosting. During this process, the air conditioner remains in heating mode, allowing defrosting to occur without suspending heating, improving the user experience.

[0042] In step S130 , after the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner is controlled to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger.

[0043] If the outdoor heat exchanger cannot be prevented from frosting even after the temperature of the outdoor heat exchanger is increased by the heat emitted by the inverter, the air conditioner switches to cooling mode for defrosting when the outdoor heat exchanger is frosted.

[0044] In some embodiments, in step S130, the specific process of controlling the air conditioner to switch to the cooling mode for defrosting according to the temperature of the outdoor heat exchanger includes: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to the cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0045] While using the heat generated by the inverter to defrost the outdoor heat exchanger, if the outdoor heat exchanger temperature continues to drop, it indicates that the frost layer on the outdoor heat exchanger is thickening and the heat generated by the inverter cannot meet the defrosting requirements, requiring a switch to cooling mode for defrosting. Specifically, if the outdoor heat exchanger temperature is less than a preset third temperature, the air conditioner is controlled to switch to cooling mode for defrosting. If the outdoor ambient temperature is greater than or equal to the preset third temperature, the heat generated by the inverter is considered sufficient for defrosting. At this point, the air conditioner is maintained in its current state and continues to operate in heating mode, with the states of the first and second solenoid valves unchanged. The preset third temperature is less than the preset second temperature. By determining whether the heat generated by the inverter meets the defrosting requirements based on the outdoor heat exchanger temperature, the air conditioner is promptly controlled to switch to cooling mode for defrosting if the defrosting requirements are not met, ensuring stable operation of the air conditioner.

[0046] In some embodiments, the process of controlling the opening and closing of the first solenoid valve and the second solenoid valve when the air conditioner is switched to the cooling mode for defrosting is also included, specifically including: after controlling the air conditioner to switch to the cooling mode, closing the first solenoid valve and opening the second solenoid valve.

[0047] When the air conditioner switches to cooling mode for defrosting, or when the air conditioner operates directly in cooling mode for user cooling, the first solenoid valve closes and the second solenoid valve opens, allowing the refrigerant discharged from the compressor to dissipate heat and cool the inverter, ensuring normal operation of the inverter. If the refrigerant discharged from the compressor cannot meet the requirements for cooling the inverter, for example, if the temperature of the refrigerant discharged from the compressor is higher than the temperature at the heat sink, the second solenoid valve closes to prevent the refrigerant discharged from the compressor from flowing through the heat sink.

[0048] In step S140 , during the process of the air conditioner operating in the cooling mode for defrosting, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate.

[0049] During the defrosting process in the refrigeration mode, since the system may be unstable, the current change rate and the exhaust pressure change rate are used to determine whether the system is currently stable, and the compressor operating frequency is controlled to keep the system in a stable state, thereby improving the system energy efficiency and defrosting efficiency.

[0050] In some embodiments, in step S140, the specific process of controlling the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate includes: judging the magnitude relationship between the current change rate and the preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the magnitude relationship between the exhaust pressure change rate and the preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0051] During defrosting in cooling mode, the outdoor fan is typically turned off or running at a low speed due to low outdoor temperatures. This can cause the compressor current and system exhaust pressure to continuously increase, necessitating control of the compressor operating frequency to ensure stable and reliable system operation. The compressor's current and exhaust pressure change rates reflect the compressor's operating status and stability. Excessive current change rates can cause the motor to overload, potentially leading to overheating and damage. Excessive exhaust pressure change rates increase compressor power consumption, reducing system efficiency. Therefore, controlling the defrost frequency based on the current and exhaust pressure change rates improves system reliability during defrost.

[0052] Specifically, when the current rate of change is greater than the preset current rate of change and the exhaust pressure rate of change is greater than the preset exhaust pressure rate of change, system stability is considered to have decreased. In this case, the compressor operating frequency is reduced to reduce the compressor's workload and heat generation, prevent compressor overheating and damage, and reduce system pressure fluctuations, thereby improving system efficiency and stability. If the current rate of change is ≤ the preset current rate of change, or the exhaust pressure rate of change is ≤ the preset exhaust pressure rate of change, the compressor operating frequency is not considered to need adjustment to avoid extending the defrost time and affecting the user experience.

[0053] Figure 4 FIG. 1 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention. Figure 4 As shown, the method includes:

[0054] Step 1: After the air conditioner begins heating, close the first solenoid valve and open the second solenoid valve, allowing the refrigerant to dissipate heat and cool the inverter. Determine whether the outdoor ambient temperature is less than the set value T1. If so, re-determine whether the outdoor ambient temperature is less than T1. If so, further determine whether the outdoor heat exchanger temperature is less than the set value T2. If the outdoor heat exchanger temperature is greater than T2, re-determine whether the outdoor heat exchanger temperature is less than T2. ​​If so, open the first solenoid valve and close the second solenoid valve, then execute Step 2.

[0055] Step 2: Determine whether the outdoor heat exchanger temperature is less than the set value T3. If the outdoor heat exchanger temperature is ≥ T3, re-determine whether the outdoor heat exchanger temperature is less than T3. If the outdoor heat exchanger temperature is less than T3, control the four-way valve to switch the air conditioner to cooling mode for defrosting, and then execute step 3.

[0056] Step 3: Determine whether the compressor current change rate is greater than a set value ΔI. If the current change rate is ≤ ΔI, re-determine whether the current change rate is greater than ΔI. If the current change rate is greater than ΔI, further determine whether the compressor exhaust pressure change rate is greater than a set value ΔP. If the exhaust pressure change rate is ≤ ΔP, re-determine whether the exhaust pressure change rate is greater than ΔP. If the exhaust pressure change rate is greater than ΔP, reduce the compressor frequency.

[0057] The technical solution of this embodiment includes a heat dissipation component for dissipating heat from the inverter. The first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. During heating operation, the first solenoid valve is closed and the second solenoid valve is opened. The opening and closing of the first solenoid valve and the second solenoid valve are controlled based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger. After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner switches to cooling mode for defrosting based on the outdoor heat exchanger temperature. During defrosting in cooling mode, the compressor operating frequency is controlled based on the current change rate and the exhaust pressure change rate. This allows the air conditioner to defrost the outdoor heat exchanger using the heat generated by the inverter, allowing the air conditioner to defrost while heating, preventing indoor heating failure and affecting the user experience. Furthermore, during defrosting in cooling mode, the compressor frequency is controlled based on the current change rate and the voltage change rate, ensuring stable operation and improving system efficiency.

[0058] According to an embodiment of the present invention, a control device for air conditioner defrost corresponding to the air conditioner defrost control method is also provided. The air conditioner includes an outdoor heat exchanger, a compressor, a throttling component, and an inverter. The inverter is provided with a heat dissipation component for dissipating heat from the inverter. The first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve. The second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. The first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor.

[0059] The system structure of air conditioning is as follows Figure 3 As shown, the heat dissipation component 6 is a heat dissipation cold plate, which includes heat dissipation fins 8 and a fan 7. The outdoor heat exchanger 5 is a fin heat exchanger, the indoor heat exchanger 3 is a plate heat exchanger, and the throttling component 4 is an electronic expansion valve. In heating mode, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, the throttling component 4, the outdoor heat exchanger 5, and the four-way valve 2 in sequence before returning to the compressor. At the same time, a portion of the refrigerant flowing out of the throttling component 4 also flows to the heat dissipation component 6. At this time, controlling the opening and closing of the first solenoid valve 9 and the second solenoid valve 10 can change the path of the refrigerant flowing out of the heat dissipation component. When the first solenoid valve 9 is open, the refrigerant flowing out of the heat dissipation component 6 flows through the outdoor heat exchanger 5 to the four-way valve 2. When the second solenoid valve 10 is open, the refrigerant flowing out of the heat dissipation component 6 flows directly to the four-way valve 2.

[0060] In cooling mode, the high-temperature, high-pressure refrigerant discharged from compressor 1 passes through four-way valve 2, outdoor heat exchanger 5, throttling component 4, indoor heat exchanger 3, and four-way valve 2 in sequence before returning to the compressor. At the same time, a portion of the high-temperature, high-pressure refrigerant discharged from compressor 1 also passes through four-way valve 2 and second solenoid valve 10 before flowing to heat sink 6. At this time, first solenoid valve 9 is closed, and the refrigerant flowing out of heat sink 6 flows directly to throttling component 4.

[0061] During the operation of the air conditioner, the refrigerant can exchange heat with the heat dissipated by the inverter at the heat dissipation component. Since the temperature of the inverter is relatively high and higher than the temperature of the refrigerant discharged by the compressor, the temperature of the refrigerant increases after the heat exchange. In heating mode, if the first solenoid valve is opened, the heated refrigerant flows into the outdoor heat exchanger, increasing the temperature at the outdoor heat exchanger and preventing frost on the outdoor heat exchanger. In cooling mode, the refrigerant discharged by the compressor can be used to dissipate heat and cool the inverter, and can prevent the risk of condensation at the inverter (there is a risk of condensation when using low-temperature refrigerant to cool the inverter). The heat dissipation component is not limited to dissipating heat for the inverter, but can also dissipate heat and cool other components that can generate higher temperatures.

[0062] See also Figure 2 The structure diagram of an embodiment of the device of the present invention is shown in FIG. The air conditioner defrosting control device may include: an acquisition unit 102 and a control unit 104 .

[0063] Acquisition unit 102 is configured to acquire the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the rate of change of the compressor current, and the rate of change of the compressor exhaust pressure when the air conditioner is operating in heating mode and the first solenoid valve is closed and the second solenoid valve is open. The specific functions and processing of acquisition unit 102 are described in step S110.

[0064] In heating mode, the first solenoid valve is normally closed and the second solenoid valve is normally open. The refrigerant flowing out of the electronic expansion valve is divided into two paths, one path passes through the outdoor heat exchanger and returns to the compressor, and the other path passes through the heat dissipation component and returns to the compressor.

[0065] The compressor current change rate can be calculated based on the current and previous compressor currents: Current change rate = (current current - previous current) / time interval. The compressor current represents the compressor's operating current. The compressor exhaust pressure change rate can be calculated based on the current and previous compressor exhaust pressures: Exhaust pressure change rate = (current exhaust pressure - previous exhaust pressure) / time interval. The outdoor heat exchanger temperature represents the surface temperature of the outdoor heat exchanger.

[0066] The control unit 104 is configured to control the first solenoid valve to open and the second solenoid valve to close based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger, thereby increasing the temperature of the outdoor heat exchanger and preventing frost on the outdoor heat exchanger. The specific functions and processing of the control unit 104 are described in step S120.

[0067] In some embodiments, the control unit 104 controls the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and the preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0068] The preset first temperature is used to determine whether frost is likely to form on the outdoor heat exchanger surface, and the preset second temperature is used to determine whether frost has already formed on the outdoor heat exchanger surface. When the outdoor ambient temperature is ≥ the preset first temperature, the outdoor heat exchanger is considered to be free of frost. When the outdoor ambient temperature is < the preset first temperature, it indicates that the outdoor temperature is low and the outdoor heat exchanger is prone to frost. In this case, the outdoor heat exchanger temperature is further used to determine whether frost has already formed. When the outdoor heat exchanger temperature is ≥ the preset second temperature, the outdoor heat exchanger is considered to be free of frost. When the outdoor heat exchanger temperature is < the preset second temperature, the outdoor heat exchanger is considered to be frosted and requires defrosting. The preset first temperature is greater than the preset second temperature.

[0069] When defrosting is determined to be necessary, the heat generated by the inverter is first used to defrost the outdoor heat exchanger. Specifically, the first solenoid valve is opened and the second solenoid valve is closed, allowing some refrigerant to be heated at the heat dissipation component before flowing into the outdoor heat exchanger. The heated refrigerant then flows into the outdoor heat exchanger, raising the temperature of the outdoor heat exchanger for defrosting. During this process, the air conditioner remains in heating mode, allowing defrosting to occur without suspending heating, improving the user experience.

[0070] The control unit 104 is further configured to control the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger after opening the first solenoid valve and closing the second solenoid valve. The specific functions and processing of the control unit 104 are shown in step S130.

[0071] If the outdoor heat exchanger cannot be prevented from frosting even after the temperature of the outdoor heat exchanger is increased by the heat emitted by the inverter, the air conditioner switches to cooling mode for defrosting when the outdoor heat exchanger is frosted.

[0072] In some embodiments, the control unit 104 controls the air conditioner to switch to the cooling mode for defrosting according to the temperature of the outdoor heat exchanger, including: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to the cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0073] While using the heat generated by the inverter to defrost the outdoor heat exchanger, if the outdoor heat exchanger temperature continues to drop, it indicates that the frost layer on the outdoor heat exchanger is thickening and the heat generated by the inverter cannot meet the defrosting requirements, requiring a switch to cooling mode for defrosting. Specifically, if the outdoor heat exchanger temperature is less than a preset third temperature, the air conditioner is controlled to switch to cooling mode for defrosting. If the outdoor ambient temperature is greater than or equal to the preset third temperature, the heat generated by the inverter is considered sufficient for defrosting. At this point, the air conditioner is maintained in its current state and continues to operate in heating mode, with the states of the first and second solenoid valves unchanged. The preset third temperature is less than the preset second temperature. By determining whether the heat generated by the inverter meets the defrosting requirements based on the outdoor heat exchanger temperature, the air conditioner is promptly controlled to switch to cooling mode for defrosting if the defrosting requirements are not met, ensuring stable operation of the air conditioner.

[0074] In some embodiments, the control unit 104 is further configured to close the first solenoid valve and open the second solenoid valve after controlling the air conditioner to switch to the cooling mode.

[0075] When the air conditioner switches to cooling mode for defrosting, or when the air conditioner operates directly in cooling mode for user cooling, the first solenoid valve closes and the second solenoid valve opens, allowing the refrigerant discharged from the compressor to dissipate heat and cool the inverter, ensuring normal operation of the inverter. If the refrigerant discharged from the compressor cannot meet the requirements for cooling the inverter, for example, if the temperature of the refrigerant discharged from the compressor is higher than the temperature at the heat sink, the second solenoid valve closes to prevent the refrigerant discharged from the compressor from flowing through the heat sink.

[0076] The control unit 104 is further configured to control the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate during the defrosting process of the air conditioner in the cooling mode. Specific functions and processing of the control unit 104 are shown in step S140.

[0077] During the defrosting process in the refrigeration mode, since the system may be unstable, the current change rate and the exhaust pressure change rate are used to determine whether the system is currently stable, and the compressor operating frequency is controlled to keep the system in a stable state, thereby improving the system energy efficiency and defrosting efficiency.

[0078] In some embodiments, the control unit 104 controls the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate, including: judging the magnitude relationship between the current change rate and a preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the magnitude relationship between the exhaust pressure change rate and the preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0079] During defrosting in cooling mode, the outdoor fan is typically turned off or running at a low speed due to low outdoor temperatures. This can cause the compressor current and system exhaust pressure to continuously increase, necessitating control of the compressor operating frequency to ensure stable and reliable system operation. The compressor's current and exhaust pressure change rates reflect the compressor's operating status and stability. Excessive current change rates can cause the motor to overload, potentially leading to overheating and damage. Excessive exhaust pressure change rates increase compressor power consumption, reducing system efficiency. Therefore, controlling the defrost frequency based on the current and exhaust pressure change rates improves system reliability during defrost.

[0080] Specifically, when the current rate of change is greater than the preset current rate of change and the exhaust pressure rate of change is greater than the preset exhaust pressure rate of change, system stability is considered to have decreased. In this case, the compressor operating frequency is reduced to reduce the compressor's workload and heat generation, prevent compressor overheating and damage, and reduce system pressure fluctuations, thereby improving system efficiency and stability. If the current rate of change is ≤ the preset current rate of change, or the exhaust pressure rate of change is ≤ the preset exhaust pressure rate of change, the compressor operating frequency is not considered to need adjustment to avoid extending the defrost time and affecting the user experience.

[0081] Figure 4 FIG. 1 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention. Figure 4 As shown, the method includes:

[0082] Step 1: After the air conditioner begins heating, close the first solenoid valve and open the second solenoid valve, allowing the refrigerant to dissipate heat and cool the inverter. Determine whether the outdoor ambient temperature is less than the set value T1. If so, re-determine whether the outdoor ambient temperature is less than T1. If so, further determine whether the outdoor heat exchanger temperature is less than the set value T2. If the outdoor heat exchanger temperature is greater than T2, re-determine whether the outdoor heat exchanger temperature is less than T2. ​​If so, open the first solenoid valve and close the second solenoid valve, then execute Step 2.

[0083] Step 2: Determine whether the outdoor heat exchanger temperature is less than the set value T3. If the outdoor heat exchanger temperature is ≥ T3, re-determine whether the outdoor heat exchanger temperature is less than T3. If the outdoor heat exchanger temperature is less than T3, control the four-way valve to switch the air conditioner to cooling mode for defrosting, and then execute step 3.

[0084] Step 3: Determine whether the compressor current change rate is greater than a set value ΔI. If the current change rate is ≤ ΔI, re-determine whether the current change rate is greater than ΔI. If the current change rate is greater than ΔI, further determine whether the compressor exhaust pressure change rate is greater than a set value ΔP. If the exhaust pressure change rate is ≤ ΔP, re-determine whether the exhaust pressure change rate is greater than ΔP. If the exhaust pressure change rate is greater than ΔP, reduce the compressor frequency.

[0085] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0086] The technical solution of the present invention comprises a heat dissipation component for dissipating heat from an inverter. The first end of the heat dissipation component is connected to the first end of an outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. During heating operation, the first solenoid valve is closed and the second solenoid valve is opened. The opening and closing of the first solenoid valve and the second solenoid valve are controlled based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger. After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner switches to cooling mode for defrosting based on the outdoor heat exchanger temperature. During defrosting in cooling mode, the compressor operating frequency is controlled based on the current change rate and the exhaust pressure change rate. This allows the air conditioner to defrost the outdoor heat exchanger using the heat generated by the inverter, allowing the air conditioner to defrost while heating, thus preventing indoor heating failure and affecting the user experience. Furthermore, during defrosting in cooling mode, the compressor frequency is controlled based on the current change rate and the voltage change rate, ensuring stable operation and improving system efficiency.

[0087] According to an embodiment of the present invention, an air conditioner corresponding to the air conditioner defrosting control device is also provided. The air conditioner may include: the air conditioner defrosting control device described above.

[0088] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0089] The technical solution of the present invention comprises a heat dissipation component for dissipating heat from an inverter. The first end of the heat dissipation component is connected to the first end of an outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. During heating operation, the first solenoid valve is closed and the second solenoid valve is opened. The opening and closing of the first solenoid valve and the second solenoid valve are controlled based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger. After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner switches to cooling mode for defrosting based on the outdoor heat exchanger temperature. During defrosting in cooling mode, the compressor operating frequency is controlled based on the current change rate and the exhaust pressure change rate. This allows the air conditioner to defrost the outdoor heat exchanger using the heat generated by the inverter, allowing the air conditioner to defrost while heating, thus preventing indoor heating failure and affecting the user experience. Furthermore, during defrosting in cooling mode, the compressor frequency is controlled based on the current change rate and the voltage change rate, ensuring stable operation and improving system efficiency.

[0090] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner defrost control method is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the air conditioner defrost control method described above.

[0091] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0092] The technical solution of the present invention comprises a heat dissipation component for dissipating heat from an inverter. The first end of the heat dissipation component is connected to the first end of an outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. During heating operation, the first solenoid valve is closed and the second solenoid valve is opened. The opening and closing of the first solenoid valve and the second solenoid valve are controlled based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger. After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner switches to cooling mode for defrosting based on the outdoor heat exchanger temperature. During defrosting in cooling mode, the compressor operating frequency is controlled based on the current change rate and the exhaust pressure change rate. This allows the air conditioner to defrost the outdoor heat exchanger using the heat generated by the inverter, allowing the air conditioner to defrost while heating, thus preventing indoor heating failure and affecting the user experience. Furthermore, during defrosting in cooling mode, the compressor frequency is controlled based on the current change rate and the voltage change rate, ensuring stable operation and improving system efficiency.

[0093] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner defrost control method is also provided. The computer program product includes a computer program. When the computer program product is processed and executed, the steps of the air conditioner defrost control method are implemented.

[0094] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0095] The technical solution of the present invention comprises a heat dissipation component for dissipating heat from an inverter. The first end of the heat dissipation component is connected to the first end of an outdoor heat exchanger via a first solenoid valve. The first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger via a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger. During heating operation, the first solenoid valve is closed and the second solenoid valve is opened. The opening and closing of the first solenoid valve and the second solenoid valve are controlled based on the outdoor ambient temperature and the temperature of the outdoor heat exchanger. After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner switches to cooling mode for defrosting based on the outdoor heat exchanger temperature. During defrosting in cooling mode, the compressor operating frequency is controlled based on the current change rate and the exhaust pressure change rate. This allows the air conditioner to defrost the outdoor heat exchanger using the heat generated by the inverter, allowing the air conditioner to defrost while heating, thus preventing indoor heating failure and affecting the user experience. Furthermore, during defrosting in cooling mode, the compressor frequency is controlled based on the current change rate and the voltage change rate, ensuring stable operation and improving system efficiency.

[0096] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0097] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A method for controlling air conditioner defrosting, characterized in that: The air conditioner includes an outdoor heat exchanger, a compressor, a throttling component, and an inverter; a heat dissipation component is provided at the inverter, and the heat dissipation component is used to dissipate heat for the inverter; a first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is further connected to the second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; The method comprises: When the air conditioner is operating in a heating mode, the first solenoid valve is closed and the second solenoid valve is open, obtaining the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor; controlling the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner is controlled to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger; When the air conditioner operates in a cooling mode for defrosting, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate.

2. The air conditioner defrosting control method according to claim 1, characterized in that: Controlling the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger includes: Determining the magnitude relationship between the outdoor ambient temperature and a preset first temperature; If the outdoor ambient temperature is greater than or equal to a preset first temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the outdoor ambient temperature is lower than a preset first temperature, determining the magnitude relationship between the temperature of the outdoor heat exchanger and a preset second temperature; If the temperature of the outdoor heat exchanger is greater than or equal to a preset second temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the temperature of the outdoor heat exchanger is lower than a preset second temperature, the first solenoid valve is opened and the second solenoid valve is closed.

3. The air conditioner defrosting control method according to claim 1 or 2, characterized in that: Controlling the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger includes: Determining the magnitude relationship between the temperature of the outdoor heat exchanger and a preset third temperature; If the temperature of the outdoor heat exchanger is lower than a preset third temperature, controlling the air conditioner to switch to a cooling mode for defrosting; If the temperature of the outdoor heat exchanger is greater than or equal to a preset third temperature, the air conditioner is controlled to maintain the current state and continue to operate.

4. The air conditioner defrosting control method according to claim 3, characterized in that: Also includes: After the air conditioner is controlled to switch to the cooling mode, the first solenoid valve is closed and the second solenoid valve is opened.

5. The air conditioner defrosting control method according to claim 1 or 4, characterized in that: Controlling the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate includes: Determining a magnitude relationship between the current change rate and a preset current change rate; If the current change rate is less than or equal to a preset current change rate, the operating frequency of the compressor is kept unchanged; If the current change rate is greater than a preset current change rate, determining a magnitude relationship between the exhaust pressure change rate and the preset exhaust pressure change rate; If the exhaust pressure change rate is less than or equal to a preset exhaust pressure change rate, the operating frequency of the compressor is kept unchanged; If the exhaust pressure change rate is greater than a preset exhaust pressure change rate, the operating frequency of the compressor is reduced.

6. A control device for air conditioner defrosting, characterized in that: The air conditioner includes an outdoor heat exchanger, a compressor, a throttling component, and an inverter; a heat dissipation component is provided at the inverter, and the heat dissipation component is used to dissipate heat for the inverter; a first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is further connected to the second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; The device comprises: an acquisition unit configured to acquire, when the air conditioner is operating in a heating mode and the first solenoid valve is in a closed state and the second solenoid valve is in an open state, an outdoor ambient temperature, a temperature of the outdoor heat exchanger, a current change rate of the compressor, and a discharge pressure change rate of the compressor; a control unit configured to control the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; The control unit is further configured to control the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger after opening the first solenoid valve and closing the second solenoid valve; The control unit is further configured to control the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate when the air conditioner operates in a cooling mode for defrosting.

7. The air conditioner defrosting control device according to claim 6, characterized in that: The control unit controls the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: Determining the magnitude relationship between the outdoor ambient temperature and a preset first temperature; If the outdoor ambient temperature is greater than or equal to a preset first temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the outdoor ambient temperature is lower than a preset first temperature, determining the magnitude relationship between the temperature of the outdoor heat exchanger and a preset second temperature; If the temperature of the outdoor heat exchanger is greater than or equal to a preset second temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the temperature of the outdoor heat exchanger is lower than a preset second temperature, the first solenoid valve is opened and the second solenoid valve is closed.

8. An air conditioner, characterized in that: include: The air conditioner defrost control device as claimed in claim 6 or 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air conditioner defrosting control method according to any one of claims 1 to 5.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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