Defrosting control method, air conditioner, and readable storage medium

Abstract

This application discloses a defrosting control method, an air conditioner, and a readable storage medium. The method includes the steps of: acquiring a first temperature change parameter corresponding to an outdoor heat exchanger and a second temperature change parameter corresponding to an outdoor environment during heating operation of the air conditioner; modifying the first temperature change parameter based on the second temperature change parameter to acquire a target temperature change parameter corresponding to the outdoor heat exchanger; and controlling the air conditioner to operate in the defrosting mode if the target temperature change parameter satisfies a defrosting mode activation condition.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application filed on March 23, 2023, bearing application number 202310293408.1, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of air conditioners, and in particular to a defrost control method, an air conditioner, and a readable storage medium. [Background technology]

[0003] The heating mode of an air conditioner can provide heat to the room and raise the indoor temperature, but it is generally used in cold winters. If the outdoor environment is too cold, frost will form on the outdoor unit of the air conditioner system, affecting the operation of the outdoor heat exchanger and reducing the indoor heating effect. Summary of the Invention [Problem to be solved by the invention]

[0004] In a defrosting control method for an air conditioner, the temperature of the outdoor heat exchanger is usually used as a criterion for determining whether to enter the defrosting mode. However, when an outdoor unit of an air conditioner is installed, it may be installed in a closed environment. During heating mode operation, if the temperature in this closed environment becomes too low, the temperature detected by the temperature sensor corresponding to the outdoor heat exchanger may become too low, which may cause a false determination to activate the defrosting mode, resulting in defrosting even when there is no frost, and reducing the heating capacity of the air conditioner. This shows that the accuracy of the defrosting control of the air conditioner is too low, reducing the heating effect of the air conditioner.

[0005] The above content is only intended to aid in understanding the technical solution of the present application, and is not an admission that the above content is prior art.

[0006] The main object of the present application is to provide a defrosting control method, an air conditioner, and a readable storage medium to improve the accuracy of defrosting control and the heating effect of the air conditioner. [Means for solving the problem]

[0007] In order to achieve the above object, the present application provides a defrosting control method, the defrosting control method comprising: acquiring a first temperature change parameter corresponding to an outdoor heat exchanger and a second temperature change parameter corresponding to an outdoor environment during heating operation of the air conditioner; modifying the first temperature change parameter based on the second temperature change parameter to obtain a target temperature change parameter corresponding to the outdoor heat exchanger; and controlling the air conditioner to operate in the defrost mode if the target temperature change parameter satisfies a defrost mode activation condition.

[0008] In one embodiment, the step of modifying the first temperature change parameter based on the second temperature change parameter and obtaining a target temperature change parameter corresponding to the outdoor heat exchanger includes: The method includes determining the difference between the first temperature change parameter and the second temperature change parameter as the target temperature change parameter.

[0009] In one embodiment, the second temperature change parameter includes a second temperature change trend and a second temperature change value, and the step of modifying the first temperature change parameter based on the second temperature change parameter and obtaining a target temperature change parameter corresponding to the outdoor heat exchanger includes: determining an adjustment factor based on the second temperature change trend; determining a correction value based on the adjustment factor and the second temperature change value; and decreasing the first temperature change parameter based on the correction value to obtain the target temperature change parameter.

[0010] In one embodiment, the step of determining an adjustment factor based on the second temperature change trend comprises: When the second temperature change tendency is a temperature rise, determining a first coefficient as the adjustment coefficient; and determining a second coefficient as the adjustment coefficient when the second temperature change tendency is a temperature decrease; The first coefficient is smaller than the second coefficient.

[0011] In one embodiment, the step of acquiring a first temperature change parameter corresponding to the outdoor heat exchanger and a second temperature change parameter corresponding to the outdoor environment during the heating operation of the air conditioner includes: acquiring the lowest temperature of the outdoor heat exchanger and the lowest outdoor environment temperature within a predetermined time after activation of the heating mode of the air conditioner, and acquiring a first real-time temperature corresponding to the outdoor heat exchanger and a second real-time temperature corresponding to the outdoor environment; determining the first temperature change parameter based on the minimum temperature of the outdoor heat exchanger and the first real-time temperature, and determining the second temperature change parameter based on the minimum outdoor ambient temperature and the second real-time temperature.

[0012] In one embodiment, the activation conditions include a first activation condition corresponding to a first defrosting mode, a second activation condition corresponding to a second defrosting mode, or a third activation condition corresponding to a third defrosting mode, and the step of controlling the air conditioner to operate in the defrosting mode when the target temperature change parameter satisfies the activation condition of the defrosting mode includes: controlling the air conditioner to operate in a first defrosting mode when the target temperature change parameter satisfies the first activation condition; controlling the air conditioner to operate in a second defrosting mode when the target temperature change parameter satisfies the second activation condition; and controlling the air conditioner to operate in a third defrosting mode when the target temperature change parameter satisfies the third activation condition; The frost thickness corresponding to the first defrost mode is greater than the frost thickness corresponding to the second defrost mode, and the frost thickness corresponding to the second defrost mode is greater than the frost thickness corresponding to the third defrost mode, and the air conditioner is in a heating state in the second defrost mode and the third defrost mode, and is in a cooling state in the first defrost mode.

[0013] In one embodiment, the first activation condition is that the target temperature change parameter is equal to or greater than a first temperature change threshold corresponding to the outdoor heat exchanger, the second activation condition is that the target temperature change parameter is smaller than the first temperature change threshold and is equal to or greater than a second temperature change threshold corresponding to the outdoor heat exchanger; the third activation condition is that the target temperature change parameter is equal to or greater than a third temperature change threshold corresponding to the outdoor heat exchanger; The first temperature change threshold is greater than the second temperature change threshold, and the second temperature change threshold is greater than the third temperature change threshold.

[0014] In one embodiment, if the target temperature change parameter satisfies a defrost mode activation condition, before the step of controlling the air conditioner to operate in the defrost mode, determining the first activation condition as the activation condition when the air conditioner satisfies a predetermined condition; If the air conditioner does not satisfy the predetermined condition, determining the second activation condition as the activation condition; and if the air conditioner does not satisfy the predetermined condition and does not satisfy the second start-up condition, determining the third start-up condition as the start-up condition; The predetermined condition indicates that the air conditioner has a request to operate in the first defrosting mode.

[0015] In one embodiment, the predetermined condition is: The current outdoor temperature is lower than the set first temperature threshold; and The current indoor temperature is lower than the set second temperature threshold; and The previous defrosting mode was the second defrosting mode, and when the second defrosting mode was terminated, the temperature of the outdoor heat exchanger was lower than a set third temperature threshold.

[0016] In one embodiment, if the target temperature change parameter satisfies a defrost mode activation condition, before the step of controlling the air conditioner to operate in the defrost mode, determining a first start-up condition as the start-up condition when the operation time of the air conditioner is longer than a predetermined time and the temperature of the outdoor heat exchanger is lower than a frosting temperature; If the air conditioner does not satisfy the first activation condition, determining the second activation condition as the activation condition; The method further includes the step of determining the third activation condition as the activation condition when the air conditioner does not satisfy the second activation condition.

[0017] In one embodiment, if the target temperature change parameter satisfies a defrost mode activation condition, before the step of controlling the air conditioner to operate in the defrost mode, determining the first start-up condition as the start-up condition when the operation time of the air conditioner is longer than a predetermined time and the temperature of the outdoor heat exchanger is lower than a frosting temperature; determining the second start-up condition as the start-up condition when the air conditioner does not satisfy the first start-up condition and the previous defrosting mode is the third defrosting mode; The method further includes a step of determining the third startup condition as the startup condition if the air conditioner does not satisfy the second startup condition, or if the air conditioner satisfies the first startup condition and the previous defrosting mode was a defrosting mode other than the third defrosting mode.

[0018] To achieve the above object, the present application further provides an air conditioner including a memory, a processor, and a defrost control program stored in the memory and executable on the processor, and when the defrost control program is executed by the processor, the steps of the defrost control method described above are realized.

[0019] To achieve the above object, the present application further provides a computer-readable storage medium having a defrosting control program stored therein, which, when executed by a processor, implements the steps of the above-described defrosting control method. [Effects of the Invention]

[0020] In the defrosting control method according to the present application, when determining whether or not the defrosting mode needs to be activated using the temperature change parameter of the outdoor heat exchanger during heating operation of the air conditioner, the temperature change parameter of the outdoor heat exchanger is corrected according to the change parameter of the outdoor ambient temperature, thereby effectively avoiding unnecessary activation of the defrosting mode due to erroneous determination caused by the influence of changes in the outdoor ambient temperature, thereby improving the accuracy of defrosting control of the outdoor heat exchanger and further improving the indoor heating effect. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a terminal structure schematic diagram of a hardware operating environment according to an aspect of the present application; [Figure 2] 1 is a flowchart of an embodiment of a defrosting control method of the present application. [Figure 3] 10 is a flowchart of another embodiment of a defrost control method of the present application.

[0022] The realization of the objects, functional features and advantages of the present application will be further explained by referring to the drawings in conjunction with the examples. DETAILED DESCRIPTION OF THE INVENTION

[0023] It should be understood that the specific embodiments described herein are merely for the purpose of illustrating the present application and are not used to limit the present application.

[0024] The present application proposes an air conditioner, which may include any type of air conditioner, such as a wall-mounted air conditioner, a cabinet-mounted air conditioner, a window-mounted air conditioner, a ceiling-mounted air conditioner, etc.

[0025] 1, in one embodiment, the air conditioner includes an indoor unit 3, an outdoor unit 2, and a control device 1, and the indoor unit 3 and the outdoor unit 2 are both connected to the control device 1. The indoor unit 3 includes an indoor heat exchanger and an outdoor fan 31 provided corresponding to the indoor heat exchanger, and the outdoor unit 2 includes a compressor 21, an electronic expansion valve 23, a switching valve 22, an outdoor heat exchanger, and an outdoor fan 24 provided corresponding to the outdoor heat exchanger.

[0026] The refrigerant cycle circuit of the air conditioner includes a compressor 21, a switching valve 22, an indoor heat exchanger, an electronic expansion valve 23, and an outdoor heat exchanger. The compressor 21, the switching valve 22, the electronic expansion valve 23, the outdoor fan 31, and the outdoor fan 24 are all connected to the control device 1.

[0027] The exhaust port of the compressor 21, the return air port of the compressor 21, the indoor heat exchanger, and the outdoor heat exchanger are all connected to a switching valve 22. An electronic expansion valve 23 is provided between the indoor heat exchanger and the outdoor heat exchanger to throttle and reduce the pressure of the refrigerant that flows through it.

[0028] The switching valve 22 has a first valve position and a second valve position to enable switching between a cooling state and a heating state of the air conditioner. When the switching valve 22 operates in the first valve position, the refrigerant flowing out of the compressor 21 flows through the outdoor heat exchanger, electronic expansion valve 23, and indoor heat exchanger in that order, and then returns to the compressor 21, and the air conditioner is in a cooling state. When the switching valve 22 operates in the second valve position, the refrigerant flowing out of the compressor 21 flows through the indoor heat exchanger, electronic expansion valve 23, and outdoor heat exchanger in that order, and then returns to the compressor 21, and the air conditioner is in a heating state.

[0029] According to differences in the operating state of the air conditioner, the heating mode, the first defrosting mode, the second defrosting mode, and the third defrosting mode of the air conditioner according to the present application will be specifically described.

[0030] In the heating mode, the switching valve 22 operates in the second valve position, the air conditioner is in the heating state, the electronic expansion valve 23 operates at the first opening, the compressor 21 operates at the heating frequency, and the outdoor fan 24 is turned on. During this process, the outdoor heat exchanger is in the evaporating state, and the indoor heat exchanger is in the condensing state.

[0031] In the first defrost mode, the switching valve 22 operates in the first valve position, the air conditioner is in a cooling state, the electronic expansion valve 23 operates at the second opening, the compressor 21 operates at the first defrost frequency, the outdoor fan 24 is turned on, and the second opening may be a throttling opening.

[0032] In the second defrosting mode, the switching valve 22 operates in the second valve position, the air conditioner is in a heating state, the electronic expansion valve 23 operates at the third opening, which is equal to or greater than the fourth opening, the compressor 21 operates at the second defrosting frequency, which is lower than the heating frequency, and the outdoor fan 24 is turned off. During this process, the indoor heat exchanger is in a condensing state.

[0033] In the third defrost mode, the switching valve 22 operates in the second valve position, the air conditioner is in a heating state, the electronic expansion valve 23 operates at a fourth opening, which is greater than the first opening, the compressor 21 operates at a third defrost frequency, which is smaller than the second defrost frequency, and the outdoor fan 24 is turned off. During this process, the indoor heat exchanger is in a condensing state.

[0034] The frost thickness corresponding to the first defrosting mode is greater than the frost thickness corresponding to the second defrosting mode, and the frost thickness corresponding to the second defrosting mode is greater than the frost thickness corresponding to the third defrosting mode. When the air conditioner switches from heating mode to the second or third defrosting mode, the switching valve 22 does not need to be switched, and the indoor heat exchanger remains in a condensing state. The opening of the electronic expansion valve 23 is increased to raise the temperature of the refrigerant flowing into the outdoor heat exchanger, thereby melting the frost on the outdoor heat exchanger. This process effectively reduces noise caused by switching the switching valve 22 and temperature fluctuations in the indoor environment. When the air conditioner switches from heating mode to defrosting mode, the switching valve 22 needs to be switched, and the indoor heat exchanger remains in an evaporating state while the outdoor heat exchanger switches to a condensing state. The high-temperature refrigerant discharged from the compressor 21 flows into the outdoor heat exchanger for heat exchange defrosting.

[0035] In one embodiment, the second degree of opening is specifically the maximum degree of opening of the electronic expansion valve 23. In other embodiments, the second degree of opening may be any other degree of opening that is greater than the first degree of opening, the third degree of opening, and the fourth degree of opening.

[0036] The subject matter sought to be protected by the claims of this application will be described in detail below with reference to the accompanying drawings.

[0037] As shown in FIG. 1, FIG. 1 is a terminal structure schematic diagram of a hardware operating environment according to an embodiment of the present application.

[0038] The terminal of the present application may be a control device for an air conditioner.

[0039] As shown in Fig. 1, the air conditioner control device may include a processor 1001 such as a CPU, a memory 1003, and a communication bus 1002. The communication bus 1002 is used to realize communication between these components. The memory 1003 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a magnetic disk memory. The memory 1003 may also be a storage device independent of the processor 1001.

[0040] As will be appreciated by those skilled in the art, the terminal structure shown in FIG. 1 does not constitute a limitation of the terminal, which may include more or fewer components, combinations of components, or different component arrangements than shown.

[0041] As shown in Fig. 1, a memory 1003 serving as a storage medium may contain a control program for an air conditioner. In the device shown in Fig. 1, a processor 1001 is used to call up the control program for the air conditioner stored in the memory 1003 and to execute the relevant steps of the control method for the air conditioner in the following embodiment.

[0042] The following describes the content sought to be protected by the claims of the present application through specific exemplary embodiments, so that those skilled in the art can better understand the scope of protection of the claims of the present application. It should be understood that the following exemplary embodiments are only for the purpose of explaining the present application and do not limit the scope of protection of the present application.

[0043] The present application further provides an air conditioner control method for use in the above air conditioner.

[0044] 2, an embodiment of a method for controlling an air conditioner of the present application is proposed. In one embodiment, the method for controlling an air conditioner includes the following steps:

[0045] Step S10: A first temperature change parameter corresponding to the outdoor heat exchanger and a second temperature change parameter corresponding to the outdoor environment are acquired during heating operation of the air conditioner.

[0046] In one embodiment, the air conditioner is already operating in heating mode, and during heating operation of the air conditioner, a first temperature change corresponding to the outdoor heat exchanger of the air conditioner and a second temperature change parameter corresponding to the outdoor environment are acquired. The first temperature change parameter is determined based on a temperature change situation detected by the outdoor heat exchanger within a predetermined time period, and the second temperature change parameter is determined based on a temperature change situation of the outdoor environment detected within the same predetermined time period. Since the outdoor heat exchanger is installed in the outdoor unit of the air conditioner and is affected by the outdoor environment, the detected temperature of the outdoor heat exchanger is affected by the second temperature change parameter, and together with the temperature change that actually occurred during heating operation of the outdoor heat exchanger, a temperature change situation characterized by the first temperature change parameter is obtained.

[0047] Step S20: modifying the first temperature change parameter based on the second temperature change parameter to obtain a target temperature change parameter corresponding to the outdoor heat exchanger.

[0048] In one embodiment, the first temperature change parameter is a parameter detected after being affected by the second temperature change parameter and may differ from the temperature change parameter generated by the outdoor heat exchanger during heating operation itself. For example, an outdoor unit of an air conditioner may be installed in a closed environment. In this case, the temperature in the closed environment may be lowered, and a decrease in the temperature of the outdoor heat exchanger may lower the temperature detected by the outdoor heat exchanger sensor. However, the defrosting mode may be controlled based on the temperature data detected by the sensor, and the defrosting mode may be activated even when there is no frost, reducing the heating effect. Therefore, the first temperature change parameter detected by the sensor may have an error. Therefore, the first temperature change parameter must be modified based on the second temperature change parameter of the outdoor environment temperature to obtain a target temperature change parameter that actually corresponds to the outdoor heat exchanger. The target temperature change parameter represents the temperature change situation actually generated by the outdoor heat exchanger.

[0049] Step S30: If the target temperature change parameter satisfies the defrost mode activation condition, the air conditioner is controlled to operate in the defrost mode.

[0050] In one embodiment, the target temperature change parameter may represent a temperature change condition actually occurring in the outdoor heat exchanger, with a larger target temperature change parameter representing a thicker layer of frost. The defrosting condition of the outdoor heat exchanger can be determined based on the temperature change condition actually occurring in the outdoor heat exchanger. Therefore, the target temperature change parameter can be used as a defrost mode activation condition, and if the target temperature satisfies the defrost mode activation condition, the air conditioner can be controlled to operate in the defrost mode. Defrosting is accurately initiated at an appropriate timing and to an appropriate degree of defrosting.

[0051] In one embodiment, when determining whether or not a defrost mode needs to be activated using the temperature change parameter of the outdoor heat exchanger during heating operation of the air conditioner, the temperature change parameter of the outdoor heat exchanger is modified using the change parameter of the outdoor ambient temperature. This effectively avoids erroneous determination caused by the influence of changes in the outdoor ambient temperature and thus improves the accuracy of defrost control of the outdoor heat exchanger and further improves the indoor heating effect.

[0052] Furthermore, in one embodiment, step S20 includes determining the difference between the first temperature change parameter and the second temperature change parameter as the target temperature change parameter.

[0053] For example, in the case where the first temperature change parameter ΔT3 and the second temperature change parameter ΔT4 are used, the target temperature change parameter is ΔT3−ΔT4.

[0054] The actual temperature change of the outdoor heat exchanger is affected by the outdoor environmental temperature change, causing the first temperature change parameter to deviate from the actual temperature change. This effect is the superposition effect of the actual temperature change. Therefore, the target temperature change parameter actually generated by the outdoor heat exchanger can be determined based on the difference between the first temperature change parameter and the second temperature change parameter. For example, if the temperature change parameter includes a temperature change value, the target temperature change value can be obtained by subtracting the second temperature change value in the second temperature conversion parameter from the first temperature change value in the first temperature change parameter. The target temperature change value can then be used as the target temperature change parameter to determine whether the defrost mode activation condition is met. This algorithm for determining the target temperature change parameter is simple, improving control efficiency.

[0055] Furthermore, in one embodiment, step S20 determining an adjustment factor based on the second temperature change trend; determining a correction value based on the adjustment factor and the second temperature change value; and decreasing the first temperature change parameter based on the correction value to obtain the target temperature change parameter.

[0056] The temperature change parameter may include a temperature change value and / or a temperature change trend. The temperature change trend is a parameter for an increase or decrease in the reference temperature, and the second temperature change parameter may include a second temperature change value and / or a second temperature change trend. As can be understood, different environmental temperatures have different effects on the detected first temperature change parameter depending on their temperature change trends. The effect of the environmental temperature change trend on the first temperature change parameter may be further considered, and an adjustment coefficient may be determined based on the second temperature change trend to calculate a more accurate error. A correction value may be obtained by adjusting the second temperature change value based on the adjustment coefficient, and the first temperature change parameter may be reduced based on the correction to compensate for the error between the first temperature change parameter and the actual temperature change condition of the outdoor heat exchanger. The adjustment coefficient may be a predetermined value determined based on testing.

[0057] In one embodiment, the change trends of the outdoor ambient temperature are different, and the risk of frost formation on the outdoor heat exchanger is different, so the impact on the frost state characterized by the temperature change parameter of the outdoor heat exchanger is different. In this way, determining the adjustment coefficient based on the second temperature change trend is advantageous to improving the accuracy of the frost state characterized by the target temperature change parameter, and determining whether to start defrosting based on the target temperature change parameter can effectively improve the accuracy, thereby further improving the accuracy of the defrost control and improving the heating effect of the air conditioner.

[0058] Furthermore, in one embodiment, step S20 includes the steps of acquiring the lowest temperature of the outdoor heat exchanger and the lowest outdoor environment temperature within a predetermined time after the heating mode of the air conditioner is started, and acquiring a first real-time temperature corresponding to the outdoor heat exchanger and a second real-time temperature corresponding to the outdoor environment; The method may further include determining the first temperature change parameter based on the minimum temperature of the outdoor heat exchanger and the first real-time temperature, and determining the second temperature change parameter based on the minimum outdoor ambient temperature and the second real-time temperature.

[0059] The temperature change parameter may be determined based on the temperature detected in real time and the minimum temperature detected within a predetermined time period. The maximum temperature change that may occur at the current time and other times obtained in this manner can better reflect the temperature change and frosting conditions. Specifically, during a predetermined time period t1-t2 during heating operation of the air conditioner, the minimum outdoor heat exchanger temperature T30 and the minimum outdoor ambient temperature T40 that occur during this predetermined time period are recorded. A first real-time temperature T3 corresponding to the outdoor heat exchanger and a second real-time temperature T4 corresponding to the outdoor ambient temperature are acquired. The real-time temperatures are temperatures detected at the current time, which may be the time when it is necessary to determine whether to activate the defrost mode. A first temperature change parameter for the outdoor heat exchanger corresponding to the current time can be determined based on the minimum outdoor heat exchanger temperature T30 and the first real-time temperature T3. A second temperature change parameter for the outdoor ambient temperature corresponding to the current time can be determined based on the minimum outdoor ambient temperature T40 and the second real-time temperature T4.

[0060] In one embodiment, the start time t1 of the predetermined time may be the start time of the heating mode of the air conditioner, and according to the operation of the heating mode, the minimum temperature of the outdoor heat exchanger and the minimum temperature of the outdoor heat exchanger may be the maximum temperature of the outdoor heat exchanger and the maximum temperature of the outdoor heat exchanger during the entire heating operation of the air conditioner.

[0061] In another embodiment, the temperature change parameter may be a temperature change value, and a first temperature change value DeltaT3=T30-T3 corresponding to the current time of the outdoor heat exchanger can be determined based on the lowest temperature T30 of the outdoor heat exchanger and the first real-time temperature T3, and a second temperature change value DeltaT4=T40-T4 corresponding to the current time of the outdoor environment can be determined based on the lowest outdoor environment temperature T40 and the second real-time temperature T3.

[0062] The second temperature change parameter is determined based on the temperature detected in real time and the minimum temperature detected during the heating startup phase, thereby ensuring that the obtained second temperature change parameter accurately reflects the temperature change situation in the environment where the outdoor unit is located under the influence of evaporation on the outdoor heat exchanger after heating startup. This is advantageous to better reflect the influence of outdoor environmental temperature changes on the outdoor heat exchanger and improve the accuracy of the frosting state characterized by the target temperature change parameter, and determining defrost startup based on the target temperature change parameter can effectively improve accuracy, thereby further improving the accuracy of defrost control and improving the heating effect of the air conditioner.

[0063] Furthermore, based on the above embodiment, another embodiment of the air conditioner control method of the present application will be proposed.

[0064] In one embodiment, the activation conditions include a first activation condition corresponding to a first defrosting mode, a second activation condition corresponding to a second defrosting mode, or a third activation condition corresponding to a third defrosting mode, and the step of controlling the air conditioner to operate in the defrosting mode when the target temperature change parameter satisfies the activation condition of the defrosting mode includes: a step S31 of controlling the air conditioner to operate in a first defrosting mode if the target temperature change parameter satisfies the first activation condition; a step S32 of controlling the air conditioner to operate in a second defrosting mode if the target temperature change parameter satisfies the second activation condition; and a step S33 of controlling the air conditioner to operate in a third defrosting mode if the target temperature change parameter satisfies the third activation condition; The frost thickness corresponding to the first defrost mode is greater than the frost thickness corresponding to the second defrost mode, and the frost thickness corresponding to the second defrost mode is greater than the frost thickness corresponding to the third defrost mode, and the air conditioner is in a heating state in the second defrost mode and the third defrost mode, and is in a cooling state in the first defrost mode.

[0065] In one embodiment, based on frost layer growth theory, the cold surface of a heat exchanger experiences three stages over time: a nucleation stage, a frost pillar growth stage, and a fluffy frost layer growth stage. Based on these three stages, the present application proposes that the air conditioner have at least three defrosting modes corresponding to the three stages. These may include the first, second, and third defrosting modes described above. To improve the defrosting effect of the air conditioner, the defrosting capacities of the provided defrosting modes are different for different frost thicknesses, and the corresponding activation conditions are also different.

[0066] When the target temperature change parameter satisfies the first activation condition, it indicates that the frost thickness a of the outdoor heat exchanger of the air conditioner is already equal to or greater than the defrost thickness corresponding to the first defrost mode. When the target temperature change parameter satisfies the second activation condition, it indicates that the frost thickness b of the outdoor heat exchanger of the air conditioner is already equal to or greater than the defrost thickness corresponding to the second defrost mode. When the target temperature change parameter satisfies the third activation condition, it indicates that the frost thickness c of the outdoor heat exchanger of the air conditioner is already equal to or greater than the defrost thickness corresponding to the third defrost mode. The frost thickness corresponding to the first defrost mode is greater than the frost thickness corresponding to the second defrost mode, which is greater than the frost thickness corresponding to the third defrost mode. In other words, frost thickness a is greater than frost thickness b, and frost thickness c is greater than frost thickness d. The first defrost mode is intended to handle heavy frost, the second defrost mode is intended to handle moderate frost, and the third defrost mode is intended to handle light frost. The better the defrosting capacity of the defrosting mode of the air conditioner, the worse the heating effect of the air conditioner in the same time period. In order to balance the heating effect and the defrosting effect, when the corresponding activation condition is met, the corresponding defrosting mode is activated.

[0067] For the first defrost mode, if the target temperature change parameter satisfies the first activation condition, the first defrost mode is activated. When the air conditioner switches from the heating mode to the first defrost mode, the switching valve in the air conditioner for switching between the cooling state and the heating state switches (switches from the second valve position to the first valve position), and the electronic expansion valve provided between the indoor heat exchanger and the outdoor heat exchanger in the air conditioner increases its opening to a set value and operates. The first defrost mode belongs to the defrost mode with switching, is in the cooling state, can provide additional heat to the outdoor heat exchanger, and can deal with heavy frost.

[0068] For the second defrost mode, if the target temperature change parameter satisfies the second activation condition, the second defrost mode is activated. When the air conditioner switches to the second defrost mode, the following steps are specifically included.

[0069] In the air conditioner, the direction of the switching valve for switching between the cooling state and the heating state is the same as the direction in the heating state, the compressor frequency is adjusted to the set operating frequency 2, and if the compressor frequency is lower than the set operating frequency 2 before defrosting begins, the compressor frequency is maintained. In the air conditioner, the electronic expansion valve installed between the indoor heat exchanger and the outdoor heat exchanger increases to the set opening degree 2, the external fan stops, and the external fan gradually reduces its rotation speed before stopping.

[0070] The second defrosting mode belongs to the non-switching defrosting mode, which is in the heating state and cannot provide additional heat to the outdoor heat exchanger, reducing the heating effect and capable of dealing with moderate frost.

[0071] For the third defrost mode, if the target temperature change parameter satisfies the third activation condition, the third defrost mode is activated. When the air conditioner switches to the third defrost mode, the following steps are specifically included.

[0072] In the air conditioner, the direction of the switching valve for switching between the cooling state and the heating state is the same as the direction in the heating state, and the compressor frequency is adjusted to the set operating frequency 1. Before defrosting begins, if the compressor frequency is lower than the set operating frequency 1, the compressor frequency is maintained. In the air conditioner, the electronic expansion valve installed between the indoor heat exchanger and the outdoor heat exchanger increases to the set opening degree 1, the external fan stops, and then the external fan operates at a reduced rotation speed of the set 1.

[0073] The third defrosting mode belongs to the non-switching defrosting mode, is in the heating state, and cannot provide additional heat for outdoor defrosting, but the set operating frequency 1 can be equal to or greater than the set operating frequency 2, and the set opening degree 1 can be equal to or greater than the set opening degree 2. Therefore, the heating effect is better than that of the second defrosting mode, but worse than that of the heating mode, and it can handle light frost.

[0074] In one embodiment, the different activation conditions are further subdivided, and different defrosting modes are activated based on the different activation conditions satisfied by the target temperature change parameter. The target temperature change parameter may represent different frosting situations, and defrosting modes with different defrosting capacities can be activated to defrost, thereby further improving the accuracy of defrosting control and the indoor heating effect.

[0075] Furthermore, in one embodiment, the first startup condition is that the target temperature change parameter is greater than or equal to a first temperature change threshold corresponding to the outdoor heat exchanger, the second startup condition is that the target temperature change parameter is smaller than the first temperature change threshold and greater than or equal to a second temperature change threshold corresponding to the outdoor heat exchanger, and the third startup condition is that the target temperature change parameter is greater than or equal to a third temperature change threshold corresponding to the outdoor heat exchanger, the first temperature change threshold being greater than the second temperature change threshold and the second temperature change threshold being greater than the third temperature change threshold.

[0076] The target temperature change parameter may represent a temperature decrease state of the outdoor heat exchanger, and as the target temperature change value of the target temperature change parameter increases and the overall decrease trend is observed, the temperature of the outdoor heat exchange tube decreases, and operation in a defrosting mode with stronger defrosting capacity is required. Since the defrosting capacity of the first defrosting mode corresponding to the first activation condition is superior to that of the second defrosting mode corresponding to the second activation condition, and the defrosting capacity of the second defrosting mode corresponding to the second activation condition is superior to that of the third defrosting mode corresponding to the third activation condition, the first activation condition may be that the target temperature change parameter is equal to or greater than a first temperature change threshold T3Set1 corresponding to the outdoor heat exchanger, the second activation condition may be that the target temperature change parameter is equal to or greater than a second temperature change threshold T3Set2 corresponding to the outdoor heat exchanger but smaller than the first temperature change threshold T3Set1, and the third activation condition may be that the target temperature change parameter is equal to or greater than a third temperature change threshold T3Set3 corresponding to the outdoor heat exchanger but smaller than the second temperature change threshold T3Set2. The first temperature change threshold T3Set1 is greater than the second temperature change threshold T3Set2, and the second temperature change threshold T3Set2 is greater than the third temperature change threshold T3Set3.

[0077] In this way, by setting the target temperature change parameters and setting different temperature change threshold ranges according to different defrosting modes, the actual frosting conditions can be matched based on the corresponding frosting conditions and defrosting capabilities of the defrosting modes, thereby improving the accuracy of defrosting control and the heating effect.

[0078] Furthermore, according to any one of the above embodiments, another embodiment of the air conditioner control method of the present application is proposed.

[0079] In one embodiment, if the target temperature change parameter satisfies a defrost mode activation condition, before the step of controlling the air conditioner to operate in the defrost mode, determining the first activation condition as the activation condition when the air conditioner satisfies a predetermined condition; If the air conditioner does not satisfy the predetermined condition, determining the second activation condition as the activation condition; and if the air conditioner does not satisfy the predetermined condition and does not satisfy the second start-up condition, determining the third start-up condition as the start-up condition; The predetermined condition indicates that the air conditioner has a request to operate in the first defrosting mode.

[0080] In one embodiment, the second defrosting mode and the third defrosting mode are defrosting schemes without switching, and since the four-way valve is not switched, the air conditioner is in the heating cycle and the defrosting effect that can be achieved is lower than the defrosting with switching in the first defrosting mode. Therefore, to ensure the defrosting effect, defrosting can be performed even when frost is severe, but when frost is light, defrosting with switching and defrosting without switching are combined to select the defrosting mode based on predetermined conditions without frequently stopping and performing defrosting with switching.

[0081] Specifically, in order to restrict the entry into the first defrost mode, a predetermined condition is additionally set, and whether or not the predetermined condition is met is determined as a priority in order to determine whether or not to enter the first defrost mode. When the air conditioner has an operation request for the first defrost mode, the predetermined condition is met.

[0082] Whether to perform the first defrost mode is determined preferentially, and the predetermined condition indicates that the air conditioner has a request to operate in the first defrost mode, that is, when the predetermined condition is met, the air conditioner has a request to operate in the first defrost mode and needs to enter a state of determining whether to switch to the defrost mode, and therefore the first start-up condition is the start-up condition for determining whether to enter the defrost mode.

[0083] If the predetermined conditions are met, it indicates that the air conditioner has an operation request for the first defrost mode and is suitable for defrosting in the first defrost mode, and the first start-up condition is set as the start-up condition for determining whether to enter the defrost mode, thereby entering a state for determining the first defrost mode with switching.

[0084] In one embodiment, after entering the first defrost mode determination state, the first defrost mode determination state can be terminated only if the first defrost mode has been operated once or at least once, and after termination, it is re-determined whether the conditions for entering the first defrost function determination state are met.

[0085] If the specified conditions are not met, it indicates that the air conditioner does not have an operation request for the first defrost mode and is not suitable for defrosting in the first defrost mode, and the second or third start-up condition is set as the start-up condition for determining whether to enter the defrost mode, thereby entering a state for determining whether to enter the second or third defrost mode without switching.

[0086] If the predetermined condition is not satisfied, the second activation condition is determined as the activation condition, and if the target temperature parameter does not satisfy the second activation condition, the third activation condition is determined as the activation condition.

[0087] In one embodiment, if the prediction conditions are met, the first activation condition is set as the activation condition for activating the defrost mode, and a state for determining the first defrost mode is entered. If the predetermined conditions are not met, a state for determining the second or third defrost mode is entered. By sequentially setting the second and third activation conditions as activation conditions for activating the defrost mode without switching, it is possible to quickly determine the defrost mode that is more suitable for the current state, improve the defrost control efficiency, and avoid a situation where defrosting is incomplete due to the accumulation of the number of defrosts without switching, thereby improving the defrosting effect and the room heating effect.

[0088] Furthermore, in one embodiment, the predetermined conditions include at least one of the following:

[0089] (1) The current outdoor temperature is lower than the set first temperature threshold.

[0090] The current outdoor temperature may be lower than the set temperature threshold 1 (T4min), which may range from -3°C to -12°C.

[0091] (2) The current indoor temperature is lower than the set second temperature threshold; The current indoor temperature may be less than the set temperature threshold 2 (T1min). The value range of T1min may be greater than 5°C.

[0092] (3) The previous defrosting mode was the second defrosting mode, and when the second defrosting mode was terminated, the temperature of the outdoor heat exchanger was lower than the set third temperature threshold value.

[0093] The previous defrosting mode was the second defrosting mode, which has good defrosting effect but is not switched to, and the temperature of the outdoor heat exchanger at the end is lower than the set temperature threshold 3 (TEendB1). The value range of TEendB1 may be greater than 2°C.

[0094] Specifically, during no-switch defrosting, the outdoor unit remains in heating mode, resulting in low defrosting performance. If the current indoor temperature or outdoor ambient temperature is too low, the heat generated in the second or third defrosting mode, which employs no-switch defrosting, cannot quickly reach a temperature high enough to defrost the heat exchanger, resulting in incomplete defrosting. Repeated cycles can cause the heat exchanger to freeze, affecting the heating performance of the air conditioner. Therefore, a temperature range for no-switch defrosting must be added to disable this defrosting method when the indoor or outdoor ambient temperature is too low. Furthermore, if the defrosting is not complete after multiple cycles during continuous no-switch defrosting, the outdoor heat exchanger temperature is low at the end of the defrosting. Therefore, condition (3) is added: if the outdoor heat exchanger temperature is still lower than the preset temperature threshold at the end of the second defrosting mode, no-switch defrosting is deemed insufficient for complete defrosting. In this case, the predetermined condition is met, triggering a decision state for entering the first defrosting mode.

[0095] Thereby, the indoor temperature, the indoor temperature and the defrosting mode already performed characterize predetermined conditions, which can determine the external frosting situation and further determine the judgment state when it is necessary to enter the first defrosting mode.

[0096] Furthermore, according to any one of the above embodiments, another embodiment of the air conditioner control method of the present application is proposed.

[0097] In one embodiment, before the step of controlling the air conditioner to operate in the defrost mode if the target temperature change parameter satisfies a defrost mode activation condition, determining a first start-up condition as the start-up condition when the operation time of the air conditioner is longer than a predetermined time and the temperature of the outdoor heat exchanger is lower than a frosting temperature; If the air conditioner does not satisfy the first activation condition, determining the second activation condition as the activation condition; The method further includes the step of determining the third activation condition as the activation condition when the air conditioner does not satisfy the second activation condition.

[0098] In one embodiment, when the temperature of the outdoor heat exchanger is lower than the frost temperature, the outdoor heat exchanger becomes frosted, and the thickness of the frost on the outdoor heat exchanger continues to increase as the operating time of the air conditioner increases, where the operating time does not refer to the operating time from the start of heating operation of the air conditioner, but rather to the operating time from the end of the previous defrost mode.

[0099] The operating time of the air conditioner is acquired, and a defrosting state is determined. If the operating time of the air conditioner is greater than a predetermined time and the temperature of the outdoor heat exchanger is lower than the frosting temperature, i.e., if frost has formed on the outdoor heat exchanger and the operating time of the air conditioner is sufficiently long, the frost on the outdoor heat exchanger must be defrosted in the first defrosting mode, which has enhanced defrosting capacity, to avoid a situation where insufficient defrosting occurs due to defrosting without multiple switching. Therefore, the first activation condition is determined as the activation condition for activating the defrosting mode, and the system enters a state for determining the first defrosting mode.

[0100] The first activation condition is that the target temperature change parameter of the outdoor heat exchanger meets the condition corresponding to the first defrost mode. If the first activation condition is not met, the target temperature change parameter does not meet the requirement corresponding to the first defrost mode, i.e., the current frost thickness does not reach the frost thickness corresponding to the first defrost mode. Then, the system enters a state for determining a second defrost mode, and the second activation condition is determined as the activation condition. If the second activation condition is not met, the target temperature change parameter does not meet the requirement corresponding to the second defrost mode, i.e., the current frost thickness does not reach the frost thickness corresponding to the second defrost mode. Then, the system enters a state for determining a third defrost mode, and the third activation condition is determined as the activation condition. The frost thickness corresponding to the third defrost mode is the thinnest, and if the third defrost mode is not met, it indicates that defrosting is not necessary.

[0101] In one embodiment, after determining that different defrosting modes can be entered, signals corresponding to the defrosting modes may be sent to the indoor unit and outdoor unit of the air conditioner to perform different defrosting operations, adjusting the rotation speed of the indoor unit fan, and simultaneously adjusting the compressor, external fan, and electronic expansion valve of the outdoor unit.

[0102] In one embodiment, after the defrosting is completed, the corresponding defrosting mode needs to be terminated, and the termination conditions of different defrosting modes are different, and the corresponding operations for the termination are not the same.

[0103] In the first defrosting mode, if the duration of the first defrosting mode is longer than a first predetermined time corresponding to the first defrosting mode, or if the temperature of the outdoor heat exchanger is higher than a first predetermined temperature corresponding to the first defrosting mode, the first defrosting mode is terminated. After the first defrosting mode is terminated, the operating time of the air conditioner is cleared, the air conditioner is restarted in heating mode, and the minimum temperature of the outdoor heat exchanger and the minimum outdoor environmental temperature within a predetermined time from the start of the air conditioner heating mode can be re-recorded.

[0104] In the second defrosting mode, if the duration of the second defrosting mode is longer than the second predetermined time corresponding to the second defrosting mode or the temperature of the outdoor heat exchanger is higher than the second predetermined temperature corresponding to the second defrosting mode, the second defrosting mode is terminated. After the second defrosting mode is terminated, the operating time of the air conditioner is cleared, and the previously recorded minimum temperature of the outdoor heat exchanger and the minimum outdoor ambient temperature within the predetermined time since the start of the heating mode of the air conditioner can be maintained.

[0105] In the third defrosting mode, if the duration of the third defrosting mode is greater than a third predetermined time corresponding to the third defrosting mode or the temperature of the outdoor heat exchanger is greater than a third predetermined temperature corresponding to the third defrosting mode, the third defrosting mode is terminated. After the second defrosting mode is terminated, the operating time of the air conditioner can be cleared, and the previously recorded minimum temperature of the outdoor heat exchanger and the minimum outdoor ambient temperature within a predetermined time since the start of the heating mode of the air conditioner can be maintained.

[0106] The first predetermined time may be greater than the second predetermined time, the second predetermined time may be greater than the third predetermined time, the first predetermined temperature may be greater than the second predetermined temperature, and the second predetermined temperature may be greater than the third predetermined temperature.

[0107] For better understanding, this application provides a specific application scenario.

[0108] When the air conditioner switches on heating operation, it monitors the first real-time temperature T3 of the outdoor heat exchanger and the first real-time temperature T4 of the outdoor environment, and records the minimum T3 temperature T30 and minimum T4 temperature T40 when the compressor operates for 7 to 12 minutes. The current operating state of the air conditioner can be determined based on T3. T30 is the outdoor heat exchanger temperature recorded when the air conditioner is in stable heating operation (no frost) after heating is started, and T40 is the outdoor environment temperature in the corresponding state. Since T4 changes over a long period of heating, and T3 changes accordingly, it is necessary to record T40 and T4 to accurately reflect the change in the outdoor environment temperature after heating operation is switched on, i.e., the second temperature change parameter.

[0109] Continuously record the heating operation time of the air conditioner, and after normal heating has been operated for Time_Pass, determine whether different defrost mode operations are required. When T3≥0°C or Time_Pass<Timeset (predetermined time), continue heating. When Time_Pass≥Timeset and T3<0°C, it indicates that the current conditions are sufficient to start frosting on the outdoor heat exchanger, and preferentially enter the determination state of the first defrost mode. Set the first startup condition as the condition to start the defrost mode, and determine whether the target temperature change parameter of the outdoor heat exchanger, that is, the target temperature change parameter (T30 - T3)-(T40 - T4), satisfies the first startup condition corresponding to the first defrost mode, which is greater than the first temperature change threshold T_C.If T_C≤(T30 - T3)-(T40 - T4) is greater, enter the first defrost mode. When T_C>(T30 - T3)-(T40 - T4), set the second startup condition (the target temperature change parameter (T30 - T3)-(T40 - T4) is not less than the second temperature change threshold T_B) as the condition to start the defrost mode. When T_B≤(T30 - T3)-(T40 - T4)<T_C, enter the third defrost mode. When T_B>(T30 - T3)-(T40 - T4), set the third startup condition (the target temperature change parameter (T30 - T3)-(T40 - T4) is not less than the third temperature change threshold T_A) as the condition to start the defrost mode, and when T_A≤(T30 - T3)-(T40 - T4)<T_B, enter the third defrost mode; otherwise, do not perform defrosting.

[0110] Based on the following predetermined end conditions, end the corresponding defrost mode.

[0111] The end condition of the third defrost mode is that the defrost duration is Time_A minutes, or T3>T3_Aout. The end condition of the second defrost mode is that the defrost duration is Time_B minutes, or T3>T3_Bout. The end condition of the first defrost mode is that the defrost duration is Time_C minutes, or T3>T3_Cout. Time_A < Time_B < Time_C and T3_Aout < T3_Bout < T3_Cout, and all are pre-set parameters.

[0112] After meeting the predetermined conditions, end the corresponding defrosting mode. In the first defrosting mode, after ending, clear Time_Pass, and at the same time restart the operation of the heating mode. After that, record the minimum values of T3 and T4 temperatures when the heating mode operates for 7 to 12 minutes, and update T30 and T40. After the end of the second defrosting mode and the third defrosting mode, clear Time_Pass and start a new heating cycle, but maintain T30 and T40.

[0113] In one embodiment, after the operating time of the air conditioner reaches a predetermined time, based on the priorities of the first start-up condition, the second start-up condition, and the third start-up condition, enter the judgment state of the corresponding defrosting mode, match the defrosting mode with the most appropriate defrosting effect for frosting, avoid repeating the same defrosting mode, and improve the defrosting effect.

[0114] Furthermore, according to any one of the above embodiments, other embodiments of the control method of the air conditioner of the present application are proposed.

[0115] In one embodiment, before the step of controlling the air conditioner to operate in the defrosting mode when the target temperature change parameter satisfies the start-up condition of the defrosting mode, when the operating time of the air conditioner is greater than the predetermined time and the temperature of the outdoor heat exchanger is lower than the frosting temperature, the step of determining the first start-up condition as the start-up condition; when the air conditioner does not satisfy the first start-up condition and the previous defrosting mode is the third defrosting mode, the step of determining the second start-up condition as the start-up condition; when the air conditioner does not satisfy the second start-up condition, or when the air conditioner satisfies the first start-up condition and the previous defrosting mode is a defrosting mode other than the third defrosting mode, the step of further including determining the third start-up condition as the start-up condition.

[0116] In one embodiment, the conditions for entering the second defrost mode determination state are limited so that before entering the second defrost mode determination state, not only is it required that the air conditioner does not satisfy the first start-up condition, but also that the previous defrost mode was a no-switch defrost mode or the third defrost mode, which has poor defrosting effects. This prevents continuous moderate and severe frosting, such as the second defrost mode + the second defrost mode or the first defrost mode + the second defrost mode, and prevents the above-mentioned situation from affecting the indoor heating effect. Therefore, the second defrost mode can be entered and moderate defrosting can be performed only after the third defrost mode.

[0117] Furthermore, the conditions for entering the third defrost mode judgment state are expanded, so that the air conditioner can enter the third defrost mode judgment state when it does not satisfy the second start-up condition, or when it satisfies the first start-up condition and the previous defrost mode was a defrost mode other than the third defrost mode, thereby preventing the previous defrost mode of the third defrost mode from being the third defrost mode, and avoiding situations where incomplete defrosting and frost thickness accumulation occur due to repeated light defrosts.If the air conditioner can satisfy the first start-up condition but has already performed medium and heavy defrosts, it enters the third defrost mode judgment state, preventing the heating effect from being affected by repeated medium and heavy defrosts, and also because the frost situation improves after the medium and heavy defrosts, making the third defrost mode more suitable for performing supplemental defrosts, thereby improving judgment efficiency.

[0118] In one embodiment, if the first start-up condition is not met and the previous defrosting mode was the third defrosting mode, the second start-up condition is determined as the start-up condition, limiting the conditions for entering the second defrosting mode determination state and avoiding repeated medium and heavy defrosting. If the second start-up condition is not met, or if the first start-up condition is met and the previous defrosting mode was a defrosting mode other than the third defrosting mode, the third start-up condition is determined as the start-up condition, widening the conditions for entering the third defrosting mode determination state and performing supplementary defrosting for residual medium and heavy defrosting. This application can improve the heating effect and defrosting efficiency.

[0119] The present application further proposes an air conditioner including a memory, a processor, and a defrost control program stored in the memory and executable on the processor, and when the defrost control program is executed by the processor, the steps of the defrost control method described in each of the above embodiments are realized.

[0120] However, as used herein, the terms "comprises," "having," or any other variation thereof, are intended to encompass a non-exclusive inclusion, and thus a process, method, article, or system that includes a set of elements is intended to include not only those elements, but also other elements not expressly listed or that are inherent in such process, method, article, or system. Absent further limitations, an element defined by the phrase "comprises one" does not exclude the presence of other identical elements in a process, method, article, or system that includes that element.

[0121] The above numbers are for illustrative purposes only and do not represent the superiority or inferiority of the embodiments.

[0122] From the above description of the embodiments, it will be apparent to those skilled in the art that the methods of the above embodiments can be realized by adding the necessary general-purpose hardware platform to software, or of course, by hardware implementation, and in many cases the former is the preferred embodiment. Based on this understanding, the essence of the technical solution of the present application or the portion that contributes to the prior art may be expressed in the form of a software product. This computer software product is stored in a storage medium such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing an air conditioner control device to execute the methods described in each embodiment of the present application.

[0123] The above are merely preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent flow conversion made using the contents of the specification and drawings of the present application, or those used directly or indirectly in other related technical fields, are all included in the patent protection scope of the present application.

Claims

1. acquiring a first temperature change parameter corresponding to an outdoor heat exchanger and a second temperature change parameter corresponding to an outdoor environment during a heating operation of the air conditioner; modifying the first temperature change parameter based on the second temperature change parameter to obtain a target temperature change parameter corresponding to the outdoor heat exchanger; and controlling the air conditioner to operate in the defrosting mode when the target temperature change parameter satisfies a defrosting mode activation condition. Defrost control method.

2. The step of modifying the first temperature change parameter based on the second temperature change parameter and obtaining a target temperature change parameter corresponding to the outdoor heat exchanger includes: determining a difference between the first temperature change parameter and the second temperature change parameter as the target temperature change parameter; The defrosting control method according to claim 1 .

3. the second temperature change parameter includes a second temperature change tendency and a second temperature change value, and the step of correcting the first temperature change parameter based on the second temperature change parameter and obtaining a target temperature change parameter corresponding to the outdoor heat exchanger includes: determining an adjustment factor based on the second temperature change trend; determining a correction value based on the adjustment factor and the second temperature change value; and decreasing the first temperature change parameter based on the correction value to obtain the target temperature change parameter. The defrosting control method according to claim 1 .

4. determining an adjustment factor based on the second temperature change trend, If the second temperature change tendency is a temperature rise, determining a first coefficient as the adjustment coefficient; and determining a second coefficient as the adjustment coefficient when the second temperature change tendency is a temperature decrease; The first coefficient is smaller than the second coefficient. The defrosting control method according to claim 3 .

5. The step of acquiring a first temperature change parameter corresponding to the outdoor heat exchanger and a second temperature change parameter corresponding to the outdoor environment during heating operation of the air conditioner includes: acquiring a minimum temperature of an outdoor heat exchanger and a minimum outdoor environment temperature within a predetermined time after activation of the heating mode of the air conditioner, and acquiring a first real-time temperature corresponding to the outdoor heat exchanger and a second real-time temperature corresponding to the outdoor environment; determining the first temperature change parameter based on a minimum temperature of the outdoor heat exchanger and the first real-time temperature, and determining the second temperature change parameter based on the minimum outdoor ambient temperature and the second real-time temperature; The defrosting control method according to claim 1 .

6. the activation conditions include a first activation condition corresponding to a first defrosting mode, a second activation condition corresponding to a second defrosting mode, or a third activation condition corresponding to a third defrosting mode, and the step of controlling the air conditioner to operate in the defrosting mode when the target temperature change parameter satisfies the activation condition of the defrosting mode includes: controlling the air conditioner to operate in a first defrosting mode when the target temperature change parameter satisfies the first activation condition; controlling the air conditioner to operate in a second defrosting mode when the target temperature change parameter satisfies the second activation condition; and controlling the air conditioner to operate in a third defrosting mode when the target temperature change parameter satisfies the third activation condition; a frost thickness corresponding to the first defrost mode is greater than a frost thickness corresponding to the second defrost mode, and a frost thickness corresponding to the second defrost mode is greater than a frost thickness corresponding to the third defrost mode, the air conditioner is in a heating state in the second defrost mode and the third defrost mode, and the air conditioner is in a cooling state in the first defrost mode. The defrosting control method according to any one of claims 1 to 5.

7. the first activation condition is that the target temperature change parameter is equal to or greater than a first temperature change threshold corresponding to the outdoor heat exchanger; the second activation condition is that the target temperature change parameter is smaller than the first temperature change threshold and is equal to or greater than a second temperature change threshold corresponding to the outdoor heat exchanger; the third activation condition is that the target temperature change parameter is equal to or greater than a third temperature change threshold corresponding to the outdoor heat exchanger; the first temperature change threshold is greater than the second temperature change threshold, and the second temperature change threshold is greater than the third temperature change threshold; The defrosting control method according to claim 6.

8. If the target temperature change parameter satisfies a defrost mode activation condition, before the step of controlling the air conditioner to operate in the defrost mode, determining the first activation condition as the activation condition when the air conditioner satisfies a predetermined condition; If the air conditioner does not satisfy the predetermined condition, determining the second activation condition as the activation condition; and if the air conditioner does not satisfy the predetermined condition and does not satisfy the second startup condition, determining the third startup condition as the startup condition; the predetermined condition indicates that the air conditioner has a request to operate in the first defrosting mode. The defrosting control method according to claim 6.

9. The predetermined condition is: The current outdoor temperature is lower than the set first temperature threshold; The current indoor temperature is lower than the set second temperature threshold; the previous defrosting mode was the second defrosting mode, and when the second defrosting mode was terminated, the temperature of the outdoor heat exchanger was lower than a set third temperature threshold. The defrosting control method according to claim 8.

10. If the target temperature change parameter satisfies a defrost mode activation condition, before the step of controlling the air conditioner to operate in the defrost mode, determining a first start-up condition as the start-up condition when the operation time of the air conditioner is longer than a predetermined time and the temperature of the outdoor heat exchanger is lower than a frosting temperature; If the air conditioner does not satisfy the first activation condition, determining the second activation condition as the activation condition; and if the air conditioner does not satisfy the second startup condition, determining the third startup condition as the startup condition. The defrosting control method according to claim 6.

11. If the target temperature change parameter satisfies a defrost mode activation condition, before the step of controlling the air conditioner to operate in the defrost mode, determining the first start-up condition as the start-up condition when the operation time of the air conditioner is longer than a predetermined time and the temperature of the outdoor heat exchanger is lower than a frosting temperature; determining the second start-up condition as the start-up condition when the air conditioner does not satisfy the first start-up condition and the previous defrosting mode is the third defrosting mode; and determining the third start-up condition as the start-up condition when the air conditioner does not satisfy the second start-up condition, or when the air conditioner satisfies the first start-up condition and the previous defrosting mode was a defrosting mode other than the third defrosting mode. The defrosting control method according to claim 6.

12. An air conditioner including a memory, a processor, and a defrosting control program stored in the memory and executable on the processor, When the defrosting control program is executed by the processor, the steps of the defrosting control method according to any one of claims 1 to 11 are realized. Air conditioner.

13. A computer-readable storage medium storing a defrosting control program, When the defrosting control program is executed by a processor, the steps of the defrosting control method according to any one of claims 1 to 11 are realized. A computer-readable storage medium.

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