Control method of air conditioner, air conditioner, and storage medium

Abstract

The application discloses a control method of an air conditioner, the air conditioner and a storage medium. The refrigerant circulation loop of the air conditioner comprises a compressor, a reversing valve, a first heat exchanger, a first electronic expansion valve, a heat exchange part, a second electronic expansion valve and a second heat exchanger, the heat exchange part is in heat exchange connection with a heating component, the first heat exchanger, the first electronic expansion valve, the heat exchange part, the second electronic expansion valve and the second heat exchanger are sequentially connected, and the method comprises the following steps: controlling the reversing valve to operate at a first valve position, controlling the first electronic expansion valve to operate at a first opening degree and controlling the second electronic expansion valve to operate at a second opening degree, so that the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state; when the air conditioner operates to meet a first defrosting condition, the opening degree of the first electronic expansion valve and / or the second electronic expansion valve is increased, so as to increase the temperature of the second heat exchanger. The application aims to avoid indoor temperature fluctuation, reduce the operation noise of the air conditioner and improve user comfort.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner control method, an air conditioner and a storage medium. BACKGROUND

[0002] An air conditioner generally adjusts the parameters of the indoor environment through a refrigerant circulation. A part of the flow path in many refrigerant circulation loops is in heat exchange connection with a heating component (for example, an electric control of an outdoor unit) in the air conditioner. When the air conditioner is cooling, the low-temperature refrigerant flowing between the indoor and outdoor units flows into the part of the flow path to cool the heating component.

[0003] When this type of air conditioner needs to defrost during heating operation, the refrigerant flow direction needs to be switched through the switching of a reversing valve to switch the air conditioner to cooling operation to defrost the heat exchanger with frost. However, this will cause fluctuations in the indoor temperature and generate noise, affecting user comfort. SUMMARY

[0004] The main purpose of the present application is to provide an air conditioner control method, an air conditioner and a storage medium, which aims to avoid fluctuations in the indoor temperature and reduce the operating noise of the air conditioner, and improve user comfort.

[0005] To achieve the above-mentioned purpose, the present application provides an air conditioner control method, the air conditioner comprising a refrigerant circulation loop, the refrigerant circulation loop comprising a compressor, a reversing valve, a first heat exchanger, a first electronic expansion valve, a heat exchange part, a second electronic expansion valve and a second heat exchanger, the heat exchange part being in heat exchange connection with a heating component, wherein the first heat exchanger, the first electronic expansion valve, the heat exchange part, the second electronic expansion valve and the second heat exchanger are connected in sequence, the air conditioner control method comprising the following steps:

[0006] controlling the reversing valve to operate at a first valve position, controlling the first electronic expansion valve to operate at a first opening degree and controlling the second electronic expansion valve to operate at a second opening degree, so that the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state;

[0007] when the air conditioner operates to meet a first defrosting condition, increasing the opening degree of the first electronic expansion valve and / or the second electronic expansion valve to increase the temperature of the second heat exchanger.

[0008] Optionally, the first opening degree is greater than a preset opening degree threshold, and the second opening degree is less than or equal to the preset opening degree threshold, and the step of increasing the opening degree of the first electronic expansion valve and / or the second electronic expansion valve comprises:

[0009] controlling the second electronic expansion valve to increase the opening degree.

[0010] Optionally, the first defrosting condition comprises a first condition or a second condition, a frost risk of the second heat exchanger corresponding to the first condition being less than a frost risk of the second heat exchanger corresponding to the second condition, and the step of controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree when the air conditioner operates to meet the first defrosting condition comprises:

[0011] controlling the first electronic expansion valve and / or the second electronic expansion valve to increase to a first target opening degree when the air conditioner operates to meet the first condition;

[0012] controlling the first electronic expansion valve and / or the second electronic expansion valve to increase to a second target opening degree when the air conditioner operates to meet the second condition;

[0013] the first target opening degree being less than the second target opening degree.

[0014] Optionally, after the step of controlling the reversing valve to operate at the first valve position, controlling the first electronic expansion valve to operate at the first opening degree, and controlling the second electronic expansion valve to operate at the second opening degree, the method further comprises:

[0015] controlling the reversing valve to operate at a second valve position, controlling the first electronic expansion valve to operate at a third opening degree, and controlling the second electronic expansion valve to operate at a fourth opening degree when the air conditioner operates to meet a second defrosting condition, so that the second heat exchanger is in a condensing state;

[0016] a frost degree of the second heat exchanger represented by the first defrosting condition being less than a frost degree of the second heat exchanger represented by the second defrosting condition.

[0017] Optionally, the third opening degree is less than or equal to a preset opening degree threshold, and the fourth opening degree is greater than the preset opening degree threshold.

[0018] Optionally, after the step of controlling the reversing valve to operate at the second valve position, controlling the first electronic expansion valve to operate at the third opening degree, and controlling the second electronic expansion valve to operate at the fourth opening degree, or the step of controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree, the method further comprises:

[0019] returning to execute the step of controlling the reversing valve to operate at the first valve position, controlling the first electronic expansion valve to operate at the first opening degree, and controlling the second electronic expansion valve to operate at the second opening degree when the air conditioner operates to meet a defrosting end condition.

[0020] Optionally, the first defrosting condition comprises a first condition or a second condition, the frosting risk of the second heat exchanger corresponding to the first condition is less than the frosting risk of the second heat exchanger corresponding to the second condition, and after the step of controlling the reversing valve to operate at the first valve position, controlling the first electronic expansion valve to operate at the first opening degree, and controlling the second electronic expansion valve to operate at the second opening degree, the method further comprises:

[0021] determining a defrosting condition that is satisfied when the air conditioner is last time defrosted as a reference condition from among the first condition, the second condition, and the second defrosting condition;

[0022] determining one of the first condition, the second condition, and the second defrosting condition as a target condition according to the reference condition;

[0023] identifying whether the air conditioner satisfies the target condition.

[0024] Optionally, the step of determining one of the first condition, the second condition, and the second defrosting condition as a target condition according to the reference condition comprises:

[0025] when the reference condition is the first condition, determining the second condition as the target condition;

[0026] when the reference condition is the second condition, determining the second defrosting condition as the target condition;

[0027] when the reference condition is the second defrosting condition, determining the first condition as the target condition.

[0028] Optionally, after the step of identifying whether the air conditioner satisfies the target condition, the method further comprises:

[0029] when the air conditioner operation does not satisfy the second defrosting condition, identifying whether the air conditioner satisfies the second condition;

[0030] when the air conditioner operation does not satisfy the second condition, identifying whether the air conditioner satisfies the first condition.

[0031] Optionally, after the step of controlling the reversing valve to operate at the first valve position, controlling the first electronic expansion valve to operate at the first opening degree, and controlling the second electronic expansion valve to operate at the second opening degree, the method further comprises:

[0032] when the air conditioner startup duration is less than a preset duration, identifying whether the air conditioner operation satisfies the second defrosting condition, and when the air conditioner operation does not satisfy the second defrosting condition, identifying whether the air conditioner operation satisfies the second condition;

[0033] when the air conditioner operation does not satisfy the second condition, identifying whether the air conditioner operation satisfies the first condition;

[0034] when the air conditioner is in the operation stage after the defrosting ends, performing the steps of determining the first condition, the second condition, and the second defrosting condition, and the defrosting condition that the air conditioner last time defrosting operation satisfies as the reference condition.

[0035] Optionally, the first defrosting condition includes a first condition or a second condition, the frosting risk of the second heat exchanger corresponding to the first condition is less than the frosting risk of the second heat exchanger corresponding to the second condition, and after the step of controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening, the step further includes:

[0036] when the air conditioner operation satisfies the first condition, controlling the fan corresponding to the first heat exchanger to operate at a reduced speed, and / or, controlling the compressor to operate at a first frequency;

[0037] when the air conditioner operation satisfies the second condition, controlling the fan corresponding to the first heat exchanger to be turned off, and / or, controlling the compressor to operate at a second frequency;

[0038] wherein the first frequency is less than the second frequency.

[0039] Optionally, the step of controlling the fan corresponding to the first heat exchanger to be turned off when the air conditioner operation satisfies the second condition includes:

[0040] when the air conditioner operation satisfies the second condition, controlling the fan corresponding to the first heat exchanger to be turned off at intervals of a first preset time length;

[0041] and / or, after the step of controlling the fan corresponding to the first heat exchanger to be turned off when the air conditioner operation satisfies the second condition, the step further includes:

[0042] when the air conditioner operation satisfies the defrosting end condition, controlling the fan corresponding to the first heat exchanger to be turned on, and controlling the electronic expansion valve to switch to the first opening at intervals of a second preset time length.

[0043] Optionally, after the step of controlling the fan corresponding to the first heat exchanger to be turned off when the air conditioner operation satisfies the second condition, the step further includes:

[0044] when the air conditioner operation satisfies the defrosting end condition, controlling the fan to be turned on and obtaining the temperature of the first heat exchanger;

[0045] When the temperature of the first heat exchanger is less than the preset temperature, the opening of the second electronic expansion valve is adjusted according to the target opening adjustment value, and the step of obtaining the temperature of the first heat exchanger is returned to be executed until the rotating speed of the fan corresponding to the first heat exchanger reaches the set rotating speed.

[0046] The first electronic expansion valve is controlled to operate at the first opening, and the second electronic expansion valve is controlled to operate at the second opening.

[0047] In addition, in order to achieve the above object, the application further provides an air conditioner, which comprises:

[0048] A refrigerant circulation loop, which comprises a compressor, a reversing valve, a first heat exchanger, a first electronic expansion valve, a heat exchange part, a second electronic expansion valve and a second heat exchanger, wherein the heat exchange part is in heat exchange connection with a heat generating component, and the first heat exchanger, the first electronic expansion valve, the heat exchange part, the second electronic expansion valve and the second heat exchanger are sequentially connected.

[0049] A control device, which comprises a memory, a processor and an air conditioner control program stored on the memory and executable on the processor, and when the air conditioner control program is executed by the processor, the steps of the air conditioner control method according to any one of the above are implemented.

[0050] In addition, in order to achieve the above object, the application further provides a storage medium, which stores an air conditioner control program, and when the air conditioner control program is executed by a processor, the steps of the air conditioner control method according to any one of the above are implemented.

[0051] The application provides an air conditioner control method, wherein a refrigerant circulation loop of the air conditioner comprises a first heat exchanger, a first electronic expansion valve, a heat exchange part, a second electronic expansion valve and a second heat exchanger which are sequentially connected, and in the process of operating the reversing valve at a first valve position, the two electronic expansion valves before and after the heat exchange part are matched with a throttle to realize that the first heat exchanger is in a condensation state and the second heat exchanger is in an evaporation state, and when the first heat exchanger is arranged in a room, the temperature of the indoor environment is improved, and when the air conditioner operates to meet the first defrosting condition in the process, it is indicated that the second heat exchanger in the evaporation state has a frosting risk, at this time, the reversing valve does not need to be reversed, the opening of the first electronic expansion valve and / or the second electronic expansion valve is increased to improve the temperature of the second heat exchanger, so as to reduce the frosting risk of the second heat exchanger, thereby delaying frosting, the air conditioner does not need to switch the heat exchange state of the second heat exchanger by reversing the reversing valve to defrost, the first heat exchanger can maintain the condensation state to release heat in the indoor environment, the indoor temperature fluctuation can be effectively avoided, the operation noise of the air conditioner generated by the reversing of the reversing valve is reduced, and the user comfort is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 Fig. 1 is a structural schematic diagram of an embodiment of the air conditioner of the present application;

[0053] Figure 2 Fig. 2 is a structural schematic diagram of the hardware structure involved in the operation of an embodiment of the air conditioner of the present application;

[0054] Figure 3 Fig. 3 is a flow schematic diagram of an embodiment of the control method of the air conditioner of the present application;

[0055] Figure 4 Fig. 4 is a flow schematic diagram of another embodiment of the control method of the air conditioner of the present application;

[0056] Figure 5 Fig. 5 is a flow schematic diagram of still another embodiment of the control method of the air conditioner of the present application;

[0057] Figure 6 Fig. 6 is a flow schematic diagram of still another embodiment of the control method of the air conditioner of the present application;

[0058] Figure 7 Fig. 7 is a flow schematic diagram of still another embodiment of the control method of the air conditioner of the present application;

[0059] Figure 8 Fig. 8 is a timing control diagram of the components in the air conditioner of the present application when different defrosting conditions are met.

[0060] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0061] It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0062] The embodiment of the present application proposes an air conditioner. The air conditioner can be a split type air conditioner (such as a cabinet type air conditioner, a wall-mounted air conditioner, etc.) or an integrated type air conditioner (such as a window type air conditioner, a mobile air conditioner, etc.).

[0063] In the embodiment of the present application, with reference to Figures 1 to 2 , the air conditioner comprises a refrigerant circulation loop and a control device 1, the refrigerant circulation loop comprises a compressor 2, a reversing valve 3, a first heat exchanger 4, a first electronic expansion valve 5, a heat exchange part 6, a second electronic expansion valve 7 and a second heat exchanger 8, the heat exchange part 6 is in heat exchange connection with a heat generating part, wherein the first heat exchanger 4, the first electronic expansion valve 5, the heat exchange part 6, the second electronic expansion valve 7 and the second heat exchanger 8 are connected in sequence. The first electronic expansion valve 5, the second electronic expansion valve 7, the compressor 2 and the reversing valve 3 are connected with the control device 1.

[0064] In the embodiment, the first heat exchanger 4 is arranged in the indoor environment, and the second heat exchanger 8 is arranged in the outdoor environment.

[0065] In the embodiment, the first electronic expansion valve 5 and the second electronic expansion valve 7 are throttling components with adjustable opening degrees.

[0066] In the embodiment, the heat generating component is an electric control component in the outdoor unit. In other embodiments, the heat generating component can also be a component that generates heat in other operating processes of the air conditioner arranged in the indoor environment. The heat exchanger 6 can dissipate heat from the heat generating component.

[0067] Specifically, the suction port of the compressor 2, the discharge port of the compressor 2, the first end of the first heat exchanger 4, and the first end of the second heat exchanger 8 are in communication with the reversing valve 3, and the second end of the first heat exchanger 4, the first electronic expansion valve 5, the heat exchanger 6, the second electronic expansion valve 7, and the second end of the second heat exchanger 8 are sequentially in communication.

[0068] In the embodiment, the reversing valve 3 is a four-way valve. The four-way valve has a first valve position and a second valve position.

[0069] In the first valve position, the discharge port of the compressor 2 is in communication with the first end of the first heat exchanger 4, and the suction port of the compressor 2 is in communication with the first end of the second heat exchanger 8. At this time, the refrigerant flowing out of the compressor 2 flows through the first heat exchanger 4, the first electronic expansion valve 5, the heat exchanger 6, the second electronic expansion valve 7, and the second heat exchanger 8 in sequence and then flows into the suction port of the compressor 2.

[0070] In the second valve position, the discharge port of the compressor 2 is in communication with the first end of the second heat exchanger 8, and the suction port of the compressor 2 is in communication with the first end of the first heat exchanger 4. At this time, the refrigerant flowing out of the compressor 2 flows through the second heat exchanger 8, the second electronic expansion valve 7, the heat exchanger 6, the first electronic expansion valve 5, and the first heat exchanger 4 in sequence and then flows into the suction port of the compressor 2.

[0071] When the air conditioner is in the heating mode, the reversing valve 3 operates in the first valve position, the first electronic expansion valve 5 operates in the first opening degree, and the second electronic expansion valve 7 operates in the second opening degree. The refrigerant flowing out of the compressor 2 flows through the first heat exchanger 4, the first electronic expansion valve 5, the heat exchanger 6, the second electronic expansion valve 7, and the second heat exchanger 8 in sequence and then flows back to the compressor 2. When the refrigerant flows through the first electronic expansion valve 5 and the second electronic expansion valve 7, the first electronic expansion valve 5 and the second electronic expansion valve 7 throttle and depressurize the refrigerant flowing therethrough to reduce the temperature. The first heat exchanger 4 is in a condensing state, and the second heat exchanger 8 is in an evaporating state. The first heat exchanger 4 can exchange heat with the indoor air to increase the indoor environment temperature. Specifically, the flow direction of the refrigerant is as shown by the dashed line in Figure 1 .

[0072] When the air conditioner is in the first defrosting mode, the reversing valve 3 operates at the first valve position, the first electronic expansion valve 5 operates at the first target opening degree, and the second electronic expansion valve 7 operates at the second target opening degree, the first target opening degree is greater than the first opening degree, and the second target opening degree is greater than the second opening degree, the refrigerant flowing out of the compressor 2 flows through the first heat exchanger 4, the first electronic expansion valve 5, the heat exchange unit 6, the second electronic expansion valve 7, and the second heat exchanger 8 in sequence, and then flows back to the compressor 2. Specifically, the flow direction of the refrigerant is shown by the dashed line in Figure 1 . In this case, the first electronic expansion valve 5 and the second electronic expansion valve 7 have smaller throttling, pressure reduction, and temperature reduction effects on the refrigerant flowing therethrough than in the heating mode. Therefore, the temperature of the refrigerant flowing into the second heat exchanger 8 in the first defrosting mode is higher than that in the heating mode, and the relatively high-temperature refrigerant flowing into the second heat exchanger 8 can reduce the frosting (prevent the formation of ice or melt the frost on the surface of the second heat exchanger 8). When the first target opening degree and the second target opening degree are both the maximum opening degree, the second heat exchanger 8 can be in the heat release state. When one of the first target opening degree and the second target opening degree is less than the maximum opening degree, the second heat exchanger 8 can be in the weak evaporation state. However, the temperature of the second heat exchanger 8 in the first defrosting mode is higher than that in the heating mode, and specifically, the temperature of the second heat exchanger 8 in the first defrosting mode is higher than the freezing point.

[0073] When the air conditioner is in the second defrosting mode, the reversing valve 3 operates at the second valve position, the first electronic expansion valve 5 operates at the third opening degree, and the second electronic expansion valve 7 operates at the fourth opening degree, the refrigerant flowing out of the compressor 2 flows through the second heat exchanger 8, the second electronic expansion valve 7, the heat exchange unit 6, the first electronic expansion valve 5, and the first heat exchanger 4 in sequence, and then flows into the gas inlet of the compressor 2. Specifically, the flow direction of the refrigerant is shown by the solid line in Figure 1 . In this case, the first electronic expansion valve 5 and the second electronic expansion valve 7 throttle, reduce the pressure, and reduce the temperature of the refrigerant flowing therethrough, the first heat exchanger 4 is in the evaporation state, and the second heat exchanger 8 is in the condensation state. The high-temperature refrigerant in the second heat exchanger 8 can release heat to melt the ice on the surface thereof.

[0074] Further, in an embodiment, referring to Figure 2 , the air conditioner further comprises a temperature detection module 01, which can include temperature sensors arranged at different positions, such as the environment where the second heat exchanger 8 is located, the environment where the first heat exchanger 4 is located, the coil of the second heat exchanger 8, the coil of the first heat exchanger 4, and the like. The temperature detection module 01 is connected to the control device 1, and the control device 1 can obtain the data detected by the temperature detection module 01.

[0075] In the embodiments of the present application, refer to Figure 2 The control device 1 of the air conditioner comprises a processor 1001 (for example, a CPU), a memory 1002, a timer 1003, and the like. The components in the control device 1 are connected through a communication bus. The memory 1002 can be a high-speed RAM memory, or a stable memory (non-volatile memory), for example, a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0076] Those skilled in the art can understand that Figure 2 The device structure shown in the above embodiments does not constitute a limitation on the device, and can include more or fewer components than shown, or combine certain components, or different component arrangements.

[0077] As shown in Figure 2 The memory 1002 as a storage medium can include a control program of the air conditioner. In the device shown in Figure 2 The processor 1001 can be used to call the control program of the air conditioner stored in the memory 1002, and perform the related step operations of the control method of the air conditioner in the following embodiments.

[0078] The embodiments of the present application also provide a control method of an air conditioner, applied to the above air conditioner.

[0079] Refer to Figure 3 An embodiment of the control method of the air conditioner is proposed in the present application. In the embodiment, the control method of the air conditioner comprises:

[0080] Step S10, controlling the reversing valve to operate at a first valve position, controlling the first electronic expansion valve to operate at a first opening degree, and controlling the second electronic expansion valve to operate at a second opening degree, so that the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state.

[0081] Specifically, step S10 is performed when the air conditioner is in a heating mode.

[0082] In the state that the reversing valve operates at the first valve position, the first electronic expansion valve operates at the first opening degree, and the second electronic expansion valve operates at the second opening degree, the refrigerant flowing out of the compressor flows through the first heat exchanger, the first electronic expansion valve, the heat exchange part, the second electronic expansion valve, and the second heat exchanger in sequence, and then flows into the gas inlet of the compressor. The opening degrees of the first opening degree and the second opening degree can be equal or different, and the first opening degree and the second opening degree cooperate to throttle and depressurize the refrigerant flowing from the first heat exchanger to the second heat exchanger, and the low-temperature and low-pressure liquid refrigerant after throttling flows back to the compressor after flowing into the second heat exchanger, and the second heat exchanger is in an evaporating state.

[0083] The first opening degree and the second opening degree can be a fixed opening degree set in advance, or a parameter determined according to an actual operation state of the air conditioner.

[0084] In step S20, when the air conditioner operates to meet the first defrosting condition, the first electronic expansion valve and / or the second electronic expansion valve is controlled to increase the opening degree to increase the temperature of the second heat exchanger.

[0085] The first defrosting condition is a condition required to be met by a state parameter of the air conditioner and / or an environmental parameter of an environment in which the air conditioner is located when the second heat exchanger in the evaporating state has a risk of frosting (the second heat exchanger has a frosting trend or has already frosted).

[0086] When the air conditioner meets the first defrosting condition, the reversing valve can be controlled to operate at the first valve position, and at least one of the first electronic expansion valve and the second electronic expansion valve can be controlled to operate at an increased opening degree.

[0087] Specifically, during the increase of the opening degree of the first electronic expansion valve and / or the second electronic expansion valve, the opening degree can be increased by a fixed amplitude set in advance, or the opening degree can be increased to a target opening degree. The target opening degree can be a fixed opening degree set in advance, or an opening degree determined according to an actual operation state of the air conditioner.

[0088] In this embodiment, the temperature of the second heat exchanger and the temperature of the heat exchange part are obtained, and the target opening degree is determined according to the temperature of the second heat exchanger and the temperature of the heat exchange part. Specifically, a temperature difference between the temperature of the second heat exchanger and a frosting temperature can be determined, and the target opening degree can be determined according to the temperature difference and the temperature of the heat exchange part. Different temperature differences and temperatures of the heat exchange part correspond to different target opening degrees. In other embodiments, the target opening degree can also be a maximum opening degree allowed for the electronic expansion valve to operate. Based on this, the first electronic expansion valve and / or the second electronic expansion valve can be controlled to increase the opening degree to the target opening degree.

[0089] When both the first electronic expansion valve and the second electronic expansion valve increase the opening degree, the increase amplitude of the second electronic expansion valve can be greater than the increase amplitude of the first electronic expansion valve, so as to effectively ensure that the temperature of the refrigerant flowing into the second heat exchanger is effectively increased.

[0090] The increase of the opening degree of the first electronic expansion valve and / or the second electronic expansion valve can reduce the throttling and pressure reduction effect of the refrigerant between the first heat exchanger and the second heat exchanger, so as to increase the temperature of the refrigerant flowing into the second heat exchanger, thereby reducing the frosting risk of the second heat exchanger and melting the ice and frost on the surface of the second heat exchanger.

[0091] When the air conditioner does not operate to meet the first defrosting condition, the reversing valve can be controlled to operate at the first valve position, the first electronic expansion valve can be controlled to operate at the first opening degree, and the second electronic expansion valve can be controlled to operate at the second opening degree.

[0092] The control method of the air conditioner provided in the embodiment of the present application can effectively avoid indoor temperature fluctuation and reduce the operation noise of the air conditioner generated by the reversing of the reversing valve, effectively improving user comfort.

[0093] Further, in the above embodiment, the first defrosting condition includes a first condition or a second condition, the frost formation risk of the second heat exchanger corresponding to the first condition is less than the frost formation risk of the second heat exchanger corresponding to the second condition, and the step of controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree when the air conditioner operates to meet the first defrosting condition includes:

[0094] controlling the first electronic expansion valve and / or the second electronic expansion valve to increase to a first target opening degree when the air conditioner operates to meet the first condition;

[0095] controlling the first electronic expansion valve and / or the second electronic expansion valve to increase to a second target opening degree when the air conditioner operates to meet the second condition;

[0096] the first target opening degree is less than the second target opening degree.

[0097] Specifically, in the present embodiment, the second heat exchanger temperature is defined as T3, the reference temperature is defined as T30, and the continuous operation time length of the compressor is defined as T. T30 is specifically determined according to the temperature data of the second heat exchanger detected within the time length less than or equal to the preset time length, and specifically, T30 is the minimum temperature value of the second heat exchanger within the time length. Based on this, the first condition and the second condition are as follows:

[0098] the first condition: T > t1, T3 < a, T30-T3 > b;

[0099] the second condition: T > t2, T30-T3 > c;

[0100] wherein t1, t2, a, b, and c are threshold values, t1 is less than t2, and b is less than c.

[0101] When the frost formation risk is small, the opening degree of the electronic expansion valve is small, which is conducive to delaying the frost formation of the second heat exchanger and reducing the loss of heating capacity, reducing the frost formation risk and further improving the user comfort in the space where the first heat exchanger is located. When the frost formation risk is large, the opening degree of the electronic expansion valve is large, which is conducive to the refrigerant flowing into the second heat exchanger having sufficient heat to eliminate the frost formation risk, thereby maintaining the indoor comfort while further reducing the frost formation risk.

[0102] Further, based on the above embodiments, another embodiment of the control method of the air conditioner is provided. In this embodiment, the first opening degree is greater than a preset opening degree threshold, and the second opening degree is less than or equal to the preset opening degree threshold. Specifically, the preset opening degree threshold can be greater than or equal to 50% of the maximum opening degree. In this embodiment, the preset opening degree threshold is 200, and the first opening degree is 480.

[0103] Based on this, referring to Figure 4 , the step S20 comprises:

[0104] Step S21, control the second electronic expansion valve to increase the opening degree.

[0105] Specifically, in this embodiment, the first temperature of the heat exchange part and the second temperature of the second heat exchanger are obtained; in the opening degree range greater than the preset opening degree threshold, the target opening degree is determined according to the first temperature and the second temperature; and the second electronic expansion valve is controlled to increase to the target opening degree.

[0106] In this embodiment, the first electronic expansion valve at the inlet of the heat exchange part operates at a large opening degree, and the second electronic expansion valve at the outlet of the heat exchange part operates at a small opening degree, which is beneficial to ensure that the first electronic expansion valve and the second electronic expansion valve cooperate to achieve the throttling and pressure reduction effect required to meet the indoor comfort, and at the same time, the temperature of the refrigerant flowing into the heat exchange part will not be too low, effectively avoiding the condensation of the heat exchange part. Based on this, when defrosting is needed, the opening degree of the second electronic expansion valve with smaller opening degree is increased, which is beneficial to quickly increase the temperature of the refrigerant entering the second heat exchanger, so as to improve the defrosting efficiency.

[0107] Further, based on any of the above embodiments, still another embodiment of the control method of the air conditioner is provided. In this embodiment, referring to Figure 5 , after the step S10, further comprising:

[0108] Step S30, when the air conditioner operates to meet the second defrosting condition, control the reversing valve to operate at the second valve position, control the first electronic expansion valve to operate at the third opening degree, and control the second electronic expansion valve to operate at the fourth opening degree, so that the second heat exchanger is in a condensing state; the second defrosting condition represents a smaller frost degree of the second heat exchanger than the first defrosting condition.

[0109] Here, the frost degree can be represented by the thickness of the frost layer on the surface of the second heat exchanger.

[0110] Specifically, the second heat exchanger corresponding to the second defrosting condition has a frost layer greater than a preset thickness.

[0111] In the embodiment, a second heat exchanger temperature is defined as T3, and a reference temperature is defined as T30, which is determined according to the temperature data of the second heat exchanger detected within a preset time length when the compressor continuously runs for less than or equal to the preset time length, and specifically, T30 is the minimum temperature value of the second heat exchanger within the time length. Based on this, the second defrosting condition is T3 < d, T30-T3 > e, where e is greater than c, d is less than a, and a is greater than or equal to the freezing point temperature, and d is less than the freezing point temperature.

[0112] Specifically, when the air conditioner operates to meet the second defrosting condition, the compressor is stopped, and the reversing valve is switched from the first valve position to the second valve position, and then the compressor is started.

[0113] In the state that the reversing valve operates at the second valve position and the electronic expansion valve operates at the first opening degree, the refrigerant discharged by the compressor flows through the second heat exchanger, the second electronic expansion valve, the heat exchange part, the first electronic expansion valve, and the first heat exchanger in sequence, and then returns to the compressor.

[0114] In the embodiment, when the second heat exchanger is not seriously frosted, the reversing valve does not reverse the increased opening degree of the electronic expansion valve to reduce the frosting risk, and when the second heat exchanger is seriously frosted, the reversing valve reverses to switch the second heat exchanger to a condensing state, so as to ensure that the second heat exchanger has enough heat to melt the frost, thereby eliminating the influence of defrosting on the reliability and heating effect of the air conditioner and ensuring the normal operation of the air conditioner.

[0115] Further, in the embodiment, the third opening degree is less than or equal to a preset opening degree threshold, and the fourth opening degree is greater than the preset opening degree threshold.

[0116] Specifically, the preset opening degree threshold can be greater than or equal to 50% of the maximum opening degree. In the embodiment, the preset opening degree threshold is 200, and the fourth opening degree is 480.

[0117] In the embodiment, the second electronic expansion valve at the inlet of the heat exchange part operates at a larger opening degree, and the first electronic expansion valve at the outlet of the heat exchange part operates at a smaller opening degree, which is conducive to ensuring that the first electronic expansion valve and the second electronic expansion valve cooperate to achieve the throttling and pressure reduction effect required to meet the indoor comfort, and at the same time, the temperature of the refrigerant flowing into the heat exchange part will not be too low, effectively avoiding condensation in the heat exchange part.

[0118] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In the embodiment, after step S20, or after step S30, when the air conditioner operates to meet the defrosting end condition, the step of controlling the reversing valve to operate at the first valve position, controlling the first electronic expansion valve to operate at the first opening degree, and controlling the second electronic expansion valve to operate at the second opening degree is returned to be executed.

[0119] The defrosting end condition represents that the frosting risk of the second heat exchanger has been eliminated. Specifically, the defrosting end condition can include that the defrosting duration is greater than a preset duration and / or the temperature of the second heat exchanger is greater than a preset temperature. The defrosting duration is counted from when the first electronic expansion valve and / or the second electronic expansion valve is switched to run at the increased target opening degree or the reversing valve is switched to run at the second valve position.

[0120] In the embodiment, the first defrosting condition and the second defrosting condition are cyclically used during the operation of the air conditioner, which is beneficial to effectively eliminate the frosting risk of the second heat exchanger and effectively balance the indoor comfort and the low-temperature heating performance of the system.

[0121] Further, in the embodiment, the first defrosting condition includes a first condition and a second condition, and the frosting risk of the second heat exchanger corresponding to the first condition is less than the frosting risk of the second heat exchanger corresponding to the second condition. The first condition and the second condition are the same concept as the first condition and the second condition mentioned above, and will not be described here. Refer to Figure 6 After step S10, the method further includes:

[0122] In step S101, it is determined that the defrosting condition that is satisfied when the air conditioner is last defrosted among the first condition, the second condition and the second defrosting condition is a reference condition.

[0123] In step S102, one of the first condition, the second condition and the second defrosting condition is determined as a target condition according to the reference condition.

[0124] The reference condition is different, and the target condition corresponding to the first condition, the second condition and the second defrosting condition is different.

[0125] Specifically, when the reference condition is the first condition, the second condition is determined as the target condition; when the reference condition is the second condition, the second defrosting condition is determined as the target condition; and when the reference condition is the second defrosting condition, the first condition is determined as the target condition.

[0126] In step S103, it is identified whether the air conditioner satisfies the target condition.

[0127] In the embodiment, the defrosting condition met by the air conditioner in the last time can accurately represent the degree of frosting of the second heat exchanger after the last defrosting is completed, and therefore, the defrosting condition for identifying whether the air conditioner needs to run in the defrosting mode is selected based on the defrosting condition met by the air conditioner in the last time, which is advantageous to improving the accuracy of the selection of the defrosting operation mode of the air conditioner, ensuring that the defrosting operation of the air conditioner is accurately matched with the actual defrosting risk, and further achieving the effective balance of maintaining indoor comfort, reducing noise, and improving the low-temperature heating performance of the air conditioner. In addition, the defrosting condition representing a greater defrosting risk is used to identify whether to enter the next defrosting after each defrosting is completed, which is advantageous to further improving the accuracy of the defrosting operation control of the air conditioner, and ensuring that the refrigerant flowing into the second heat exchanger has enough heat to melt the frost.

[0128] Further, in the embodiment, when the air conditioner operation does not meet the second defrosting condition, it is identified whether the air conditioner meets the second condition; when the air conditioner operation does not meet the second condition, it is identified whether the air conditioner meets the first condition.

[0129] Based on this, when the defrosting condition corresponding to the estimated defrosting risk is not reached, it is further identified whether the defrosting condition representing a lower level of defrosting risk is met, so as to ensure that no matter whether the defrosting risk increases or decreases, as long as there is a risk, the accurate defrosting mode can be adopted, thereby effectively eliminating the defrosting risk of the second heat exchanger, and improving the low-temperature heating performance of the air conditioner.

[0130] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In the embodiment, referring to Figure 7 , after step S10, it further includes:

[0131] Step S01, when the starting time length of the air conditioner is less than a preset time length, it is identified whether the air conditioner operation meets the second defrosting condition, and when the air conditioner operation does not meet the second defrosting condition, it is identified whether the air conditioner operation meets the second condition;

[0132] Specifically, the starting time length less than the preset time length represents the starting stage of the air conditioner, and the identification of whether the air conditioner operation meets the second defrosting condition in this stage is the first identification of whether the air conditioner needs to run in the defrosting mode.

[0133] Step S02, when the air conditioner operation does not meet the second condition, it is identified whether the air conditioner operation meets the first condition;

[0134] Step S03, when the air conditioner is in the running stage after the defrosting is completed, the step of determining the defrosting condition met by the air conditioner in the last time defrosting operation among the first condition, the second condition, and the second defrosting condition as the reference condition is performed.

[0135] When the air conditioner runs to meet the second defrosting condition, the reversing valve is controlled to run at the second valve position, the first electronic expansion valve is controlled to run at the third opening degree, and the second electronic expansion valve is controlled to run at the fourth opening degree. When the air conditioner runs to meet the defrosting end condition, the reversing valve is controlled to run at the first valve position, the first electronic expansion valve is controlled to run at the first opening degree, and the second electronic expansion valve is controlled to run at the second opening degree. In this process, the step of determining the defrosting condition met by the air conditioner in the last defrosting operation among the first condition, the second condition, and the second defrosting condition as the reference condition can be performed.

[0136] When the air conditioner runs to meet the second condition, the opening degree of the first electronic expansion valve and / or the second electronic expansion valve is increased. When the air conditioner runs to meet the defrosting end condition, the first electronic expansion valve is controlled to run at the first opening degree, and the second electronic expansion valve is controlled to run at the second opening degree. In this process, the step of determining the defrosting condition met by the air conditioner in the last defrosting operation among the first condition, the second condition, and the second defrosting condition as the reference condition can be performed.

[0137] When the air conditioner does not meet the second condition, it is determined whether the air conditioner meets the first condition. When the air conditioner meets the first condition, the opening degree of the first electronic expansion valve and / or the second electronic expansion valve is increased. When the air conditioner runs to meet the defrosting end condition, the first electronic expansion valve is controlled to run at the first opening degree, and the second electronic expansion valve is controlled to run at the second opening degree. In this process, the step of determining the defrosting condition met by the air conditioner in the last defrosting operation among the first condition, the second condition, and the second defrosting condition as the reference condition can be performed.

[0138] In the embodiment, by the above-mentioned manner, the judgment of the second defrosting condition is prioritized after the start of the air conditioner, the frosting condition of the second heat exchanger before the start of the air conditioner can be accurately identified, and the defrosting process can be effectively avoided during the subsequent reversing valve running at the first valve position, which is beneficial to further improve the low-temperature heating performance of the air conditioner. In the case of not meeting the second defrosting condition, it is further determined whether the second condition is met, which can effectively avoid the defrosting of the second heat exchanger without ice and frost when the first condition is used for identification at the start of operation, so as to further improve the accuracy of the defrosting control of the air conditioner, reduce the influence on the indoor heating effect, and further improve the indoor comfort.

[0139] In order to better understand the process of selecting different defrosting conditions in the above-mentioned embodiments, a specific example is described as follows:

[0140] 1. Start of heating (control the reversing valve to run at the first valve position, control the first electronic expansion valve to run at the first opening degree, and control the second electronic expansion valve to run at the second opening degree);

[0141] 2, detecting whether the second defrosting condition is met, if yes, the next defrosting is detected according to the second defrosting condition, 3, if not, detecting whether the second condition is met;

[0142] 4, detecting whether the second condition is met, if yes, entering defrosting mode two (controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree), if not, continuing heating;

[0143] 5, after the end of defrosting mode two, the next defrosting is preferentially judged whether the first condition is met, if yes, entering defrosting mode one (controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree), if not, continuing heating;

[0144] 6, after the end of defrosting mode one, the next defrosting is preferentially judged whether the second condition is met, if yes, entering defrosting mode two, if not, judging whether the first condition is met;

[0145] 7, after the end of defrosting mode two, judging whether the second defrosting condition is met, if yes, the next defrosting enters defrosting mode three (controlling the reversing valve to run at the second valve position, controlling the first electronic expansion valve to run at the third opening degree, and controlling the second electronic expansion valve to run at the fourth opening degree), if not, judging whether the second condition is met;

[0146] 8, the defrosting mode three is performed once for one cycle;

[0147] Defrosting mode one and two are non-stop defrosting, the reversing valve does not reverse, defrosting mode three is traditional reverse cycle defrosting, the first defrosting mode described above includes defrosting mode one or defrosting mode two, and the second defrosting mode described above includes defrosting mode three.

[0148] Further, based on any of the above embodiments, the control method of the air conditioner according to another embodiment of the present application is proposed. In this embodiment, the first defrosting condition includes the first condition or the second condition, the frosting risk of the second heat exchanger corresponding to the first condition is less than the frosting risk of the second heat exchanger corresponding to the second condition, after step S20, the method further includes: when the air conditioner operates to meet the first condition, controlling the fan corresponding to the first heat exchanger to run at a reduced speed, and / or controlling the compressor to run at a first frequency; when the air conditioner operates to meet the second condition, controlling the fan corresponding to the first heat exchanger to be turned off, and / or controlling the compressor to run at a second frequency; wherein the first frequency is less than the second frequency.

[0149] Specifically, during the process that the reversing valve runs at the first valve position and the first electronic expansion valve and / or the second electronic expansion valve runs at the increased opening degree when the air conditioner runs to meet the first condition, the fan corresponding to the first heat exchanger is controlled to run at a reduced speed, and / or the compressor is controlled to run at a first frequency.

[0150] Based on this, the frosting risk of the second heat exchanger corresponding to the first condition is low, at this time, the fan corresponding to the first heat exchanger is maintained to run at a reduced speed, which is beneficial to ensure that the first heat exchanger maintains a condensing state while reducing heat exchange, and is beneficial to the refrigerant entering the second heat exchanger to have enough heat to quickly eliminate the frosting risk thereof; and at this time, the reduction of the frequency of the compressor to the first frequency is beneficial to improve the evaporation temperature of the second heat exchanger, thereby effectively improving the temperature of the second heat exchanger to eliminate the frosting risk thereof in cooperation with the electronic expansion valve running at the increased opening degree, while ensuring that the heat of the first heat exchanger does not decrease too much to ensure the user comfort in the space where the first heat exchanger is located.

[0151] Specifically, during the process that the reversing valve runs at the first valve position and the first electronic expansion valve and / or the second electronic expansion valve runs at the increased opening degree when the air conditioner runs to meet the second condition, the fan corresponding to the first heat exchanger is controlled to be turned off, and / or the compressor is controlled to run at a smaller frequency.

[0152] Based on this, the frosting risk of the second heat exchanger corresponding to the second condition is high, at this time, the fan corresponding to the first heat exchanger is turned off, which is beneficial to ensure that the first heat exchanger maintains a condensing state while reducing heat exchange, and is beneficial to the refrigerant entering the second heat exchanger to have enough heat to quickly eliminate the frosting risk thereof; and at this time, the reduction of the frequency of the compressor to the second frequency is beneficial to further improve the evaporation temperature of the second heat exchanger, thereby effectively improving the temperature of the second heat exchanger to eliminate the frosting risk thereof in cooperation with the electronic expansion valve running at the second opening degree.

[0153] Further, the defrosting process of the air conditioner running to meet the first condition is defined as defrosting mode one, and the defrosting process of the air conditioner running to meet the second condition is defined as defrosting mode two, and the running of the indoor electric auxiliary heating module, the fan corresponding to the first heat exchanger, the compressor, the reversing valve, the fan corresponding to the second heat exchanger and the electronic expansion valve in the defrosting process and before and after the defrosting process respectively corresponds to the running time sequence diagram of the defrosting mode one and the defrosting mode two. Figure 8 Figure 8 (a) is the running time sequence diagram of each component in the defrosting mode one, Figure 8 (b) is the running time sequence diagram of each component in the defrosting mode two. Based on this, the effective consideration of defrosting and indoor comfort is realized by the cooperation of the running of each component. The above-mentioned first defrosting mode includes the defrosting mode one or the defrosting mode two herein.

[0154] ​Further, in the embodiment, the step of controlling the fan corresponding to the first heat exchanger to be closed when the air conditioner runs to meet the second condition comprises:

[0155] controlling the fan corresponding to the first heat exchanger to be closed at intervals of a first preset time length when the air conditioner runs to meet the second condition.

[0156] The first preset time length can be a fixed time length set in advance, or a time length determined according to the actual running condition of the air conditioner, for example, the first preset time length is determined according to the temperature of the first heat exchanger.

[0157] The fan corresponding to the first heat exchanger is closed with a time delay when the air conditioner meets the second condition, which is beneficial to prevent the temperature of the indoor heat exchanger from being too high due to the stopping of the fan at the beginning of defrosting.

[0158] Further, in the embodiment, after the step of controlling the fan corresponding to the first heat exchanger to be closed when the air conditioner runs to meet the second condition, the method further comprises:

[0159] controlling the fan corresponding to the first heat exchanger to be opened when the air conditioner runs to meet a defrosting end condition, and controlling the electronic expansion valve to be switched to run at the first opening degree at intervals of a second preset time length.

[0160] The second preset time length can be a fixed time length set in advance, or a time length determined according to the actual running condition of the air conditioner, for example, the second preset time length is determined according to the temperature of the first heat exchanger.

[0161] The fan corresponding to the first heat exchanger is closed during the defrosting process, and the fan is opened and then the electronic expansion valve is controlled to act with a time delay after the defrosting ends, which is beneficial to prevent the opening degree of the electronic expansion valve from being too small, the rotating speed of the indoor fan from not reaching a predetermined rotating speed, the temperature of the first heat exchanger from rising too fast, and the air conditioner from stopping due to frequency limiting, and is beneficial to improve the system running stability.

[0162] Further, in the embodiment, after the step of controlling the fan corresponding to the first heat exchanger to be closed when the air conditioner runs to meet the second condition, the method further comprises: controlling the fan to be opened and obtaining the temperature of the first heat exchanger when the air conditioner runs to meet a defrosting end condition; decreasing the opening degree of the second electronic expansion valve according to a target opening degree adjustment value when the temperature of the first heat exchanger is less than a preset temperature, returning to execute the step of obtaining the temperature of the first heat exchanger until the rotating speed of the fan corresponding to the first heat exchanger reaches a set rotating speed; and controlling the second electronic expansion valve to run at the second opening degree.

[0163] The set rotating speed can be a target rotating speed after the fan is opened.

[0164] The target opening degree adjustment value herein can be a preset fixed value, or can be determined according to the target opening degree after the opening degree of the first electronic expansion valve and the second electronic expansion valve is increased when the second condition is reached. Different target opening degrees correspond to different target opening degree adjustment values. Specifically, the difference between the target opening degree and the set opening degree can be determined as the target opening degree adjustment value according to the ratio of the difference to the preset adjustment times.

[0165] When the first electronic expansion valve is increased from the first opening degree to the first target opening degree when the second condition is reached, the opening degree of the first electronic expansion valve is reduced by the target opening degree adjustment value on the basis of the first target opening degree before the rotational speed corresponding to the first heat exchanger reaches the set rotational speed, and the first electronic expansion valve operates at the first opening degree when the rotational speed corresponding to the first heat exchanger reaches the set rotational speed. When the second electronic expansion valve is increased from the second opening degree to the second target opening degree when the second condition is reached, the opening degree of the second electronic expansion valve is reduced by the target opening degree adjustment value on the basis of the second target opening degree before the rotational speed corresponding to the first heat exchanger reaches the set rotational speed, and the second electronic expansion valve operates at the second opening degree when the rotational speed corresponding to the first heat exchanger reaches the set rotational speed.

[0166] In this embodiment, the control in the above manner after the second defrosting mode ends is advantageous to prevent the opening degree of the electronic expansion valve from being too small, the indoor fan from not reaching the predetermined rotational speed, the temperature of the first heat exchanger from rising too fast, and the air conditioner from stopping running due to frequency limiting, and is advantageous to improve the system running stability.

[0167] In addition, the embodiment of the present application also provides a storage medium, and the storage medium stores a control program of an air conditioner. When the control program of the air conditioner is executed by a processor, the related steps of any one of the embodiments of the control method of the air conditioner are implemented.

[0168] Since the storage medium adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0169] It should be noted that, in this document, the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or system that includes a list of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article, or system. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article, or system that includes the element.

[0170] The above embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0171] Those skilled in the art can clearly understand the above-mentioned embodiment method can be realized by means of software and the necessary general hardware platform, of course, can also be through hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application essentially or say the part of the prior art contribution can be embodied in the form of software products, the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disc, optical disc) as described above, including a number of instructions to make a terminal device (may be a mobile phone, computer, server, air conditioner, or network equipment, etc.) executes the method described in various embodiments of the present application.

[0172] The above is only the preferred embodiment of the present application, not therefore limit the patent scope of the present application, any equivalent structure or equivalent flow transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes a refrigerant circulation loop, which includes a compressor, a reversing valve, a first heat exchanger, a first electronic expansion valve, a heat exchange section, a second electronic expansion valve, and a second heat exchanger. The heat exchange section is connected to a heating element for heat exchange. The first heat exchanger, the first electronic expansion valve, the heat exchange section, the second electronic expansion valve, and the second heat exchanger are connected sequentially. The control method of the air conditioner includes the following steps: The reversing valve is controlled to operate in a first valve position, the first electronic expansion valve is controlled to operate at a first opening degree, and the second electronic expansion valve is controlled to operate at a second opening degree, so that the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state. The defrosting condition satisfied during the last defrosting run of the air conditioner is determined as the reference condition among the first condition, the second condition, and the second defrosting condition. When the reference condition is the first condition, the second condition is determined as the target condition; when the reference condition is the second condition, the second defrosting condition is determined as the target condition; when the reference condition is the second defrosting condition, the first condition is determined as the target condition. Identify whether the air conditioner meets the target conditions; When the air conditioner is not operating under the second defrosting condition, identify whether the air conditioner meets the second condition; When the air conditioner does not meet the second condition, identify whether the air conditioner meets the first condition. When the air conditioner is operating under the first condition or the second condition, the opening of the first electronic expansion valve and / or the second electronic expansion valve is increased to raise the temperature of the second heat exchanger. When the air conditioner meets the second defrosting condition, the reversing valve is controlled to operate in the second valve position, the first electronic expansion valve is controlled to operate in the third opening degree, and the second electronic expansion valve is controlled to operate in the fourth opening degree, so that the second heat exchanger is in a condensing state. Wherein, the degree of frost formation on the second heat exchanger characterized by the second condition is less than the degree of frost formation on the second heat exchanger characterized by the second defrosting condition, and the frost formation risk of the second heat exchanger corresponding to the first condition is less than the frost formation risk of the second heat exchanger corresponding to the second condition.

2. The control method for an air conditioner as described in claim 1, characterized in that, The first opening degree is greater than a preset opening threshold, and the second opening degree is less than or equal to the preset opening threshold. The step of controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree includes: Control the second electronic expansion valve to increase its opening.

3. The control method for an air conditioner as described in claim 1, characterized in that, The step of controlling the first electronic expansion valve and / or the second electronic expansion valve to increase their opening degree when the air conditioner is operating under the first condition or the second condition includes: When the air conditioner operates in accordance with the first condition, the first electronic expansion valve and / or the second electronic expansion valve are controlled to increase to the first target opening degree. When the air conditioner operates in accordance with the second condition, the first electronic expansion valve and / or the second electronic expansion valve are controlled to increase to the second target opening degree. The first target opening is smaller than the second target opening.

4. The control method for an air conditioner as described in claim 1, characterized in that, The third opening degree is less than or equal to a preset opening degree threshold, and the fourth opening degree is greater than the preset opening degree threshold.

5. The control method for an air conditioner as described in claim 1, characterized in that, After the steps of controlling the reversing valve to operate at the second valve position, controlling the first electronic expansion valve to operate at the third opening degree, and controlling the second electronic expansion valve to operate at the fourth opening degree, or, after controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree, the method further includes: When the air conditioner reaches the defrosting end condition, the process returns to the steps of controlling the reversing valve to operate in the first valve position, controlling the first electronic expansion valve to operate at the first opening degree, and controlling the second electronic expansion valve to operate at the second opening degree.

6. The control method for an air conditioner as described in claim 1, characterized in that, After the steps of controlling the reversing valve to operate at the first valve position, controlling the first electronic expansion valve to operate at the first opening degree, and controlling the second electronic expansion valve to operate at the second opening degree, the method further includes: When the air conditioner's start-up time is less than the preset time, it is identified whether the air conditioner's operation meets the second defrosting condition; and when the air conditioner's operation does not meet the second defrosting condition, it is identified whether the air conditioner's operation meets the second condition. When the air conditioner does not meet the second condition, identify whether the air conditioner meets the first condition. When the air conditioner is in the operation phase after defrosting, the step of determining the defrosting condition satisfied during the last defrosting operation of the air conditioner among the first condition, the second condition, and the second defrosting condition is performed as the reference condition.

7. The control method for an air conditioner as described in any one of claims 1 to 6, characterized in that, After the step of controlling the first electronic expansion valve and / or the second electronic expansion valve to increase the opening degree, the method further includes: When the air conditioner meets the first condition, the fan corresponding to the first heat exchanger is controlled to reduce its speed, and / or the compressor is controlled to reduce its speed to the first frequency. When the air conditioner meets the second condition, the fan corresponding to the first heat exchanger is controlled to shut down, and / or the compressor is controlled to operate at a second frequency. Wherein, the first frequency is less than the second frequency.

8. The control method for an air conditioner as described in claim 7, characterized in that, The step of controlling the fan corresponding to the first heat exchanger to shut down when the air conditioner meets the second condition includes: When the air conditioner meets the second condition, the fan corresponding to the first heat exchanger is controlled to shut down at a first preset time interval. And / or, after the step of controlling the fan corresponding to the first heat exchanger to shut down when the air conditioner operates under the second condition, the method further includes: When the air conditioner meets the defrosting end conditions, the fan corresponding to the first heat exchanger is turned on, and after a second preset time interval, the first electronic expansion valve is switched to the first opening degree.

9. The control method for an air conditioner as described in claim 7, characterized in that, After the step of controlling the fan corresponding to the first heat exchanger to shut down when the air conditioner meets the second condition, the method further includes: When the air conditioner meets the defrosting end conditions, the fan is controlled to turn on and the temperature of the first heat exchanger is obtained. When the temperature of the first heat exchanger is lower than the preset temperature, the opening of the second electronic expansion valve is reduced according to the target opening adjustment value, and the process returns to the step of obtaining the temperature of the first heat exchanger until the speed of the fan corresponding to the first heat exchanger reaches the set speed. The first electronic expansion valve is controlled to operate at the first opening degree, and the second electronic expansion valve is controlled to operate at the second opening degree.

10. An air conditioner, characterized in that, The air conditioner includes: The refrigerant circulation loop includes a compressor, a reversing valve, a first heat exchanger, a first electronic expansion valve, a heat exchange section, a second electronic expansion valve, and a second heat exchanger. The heat exchange section is connected to the heating element for heat exchange. The first heat exchanger, the first electronic expansion valve, the heat exchange section, the second electronic expansion valve, and the second heat exchanger are connected in sequence. A control device, comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program, when executed by the processor, implements the steps of the air conditioner control method as described in any one of claims 1 to 9.

11. A storage medium, characterized in that, The storage medium stores a control program for an air conditioner, which, when executed by a processor, implements the steps of the control method for an air conditioner as described in any one of claims 1 to 9.

Images