Defrosting control method, air conditioning equipment and computer readable storage medium

Abstract

The invention discloses a defrosting control method, air conditioning equipment and a computer readable storage medium. The defrosting control method is applied to the air conditioning equipment and comprises the steps that the current working condition of the air conditioning equipment is obtained, and the rated heat exchange capacity, corresponding to the current working condition, of the air conditioning equipment is obtained; the current heat exchange capacity of the air conditioning equipment is obtained; the current heat exchange capacity attenuation rate of the air conditioning equipment is obtained based on the current heat exchange capacity and the rated heat exchange capacity; and whether the air conditioning equipment starts defrosting or not is controlled based on the current heat exchange capacity attenuation rate. By means of the mode, the defrosting control method has the working condition self-adaptability, the defrosting requirement and the defrosting time can be accurately recognized, and therefore the accuracy of defrosting control is improved, and energy waste is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning defrosting, and in particular to a defrosting control method, air-conditioning equipment and a computer-readable storage medium. Background Art

[0002] When the air conditioner is heating in winter, the surface temperature of the outdoor unit is low. When the surface temperature is lower than the air dew point and less than 0 degrees, frost will form on the surface of the outdoor unit. When the frost layer on the surface of the outdoor unit reaches a certain thickness, the performance and even safety of the indoor unit will be adversely affected. Therefore, air conditioners are equipped with defrosting systems and corresponding defrosting controls. Defrosting is generally achieved by heating the outdoor unit in a reverse cycle of the indoor unit to melt the frost on the surface.

[0003] Although the defrost control method has undergone certain development and optimization after years of development. However, the current defrost control cannot accurately judge the frosting state and defrosting timing, and there are still many cases of false defrosting. False defrosting includes the following two situations: one is that the outdoor unit is severely frosted but the unit does not start defrosting. At this time, the frost will cause the performance and safety of the indoor unit to be adversely affected; the other is that when the outdoor unit is not frosted, the indoor unit mistakenly thinks that it is frosted and starts defrosting. The indoor unit is generally defrosted by starting the reverse cycle, which will cause the indoor temperature to drop and unnecessary energy waste during reverse cycle defrosting. Summary of the invention

[0004] In order to solve the above problems, the present application proposes a defrost control method, air conditioning equipment and computer-readable storage medium, aiming to solve the above problems.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a defrost control method, which is applied to air-conditioning equipment, and the defrost control method includes: obtaining the current operating condition of the air-conditioning equipment, and obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating condition; obtaining the current heat exchange capacity of the air-conditioning equipment; obtaining the current heat exchange capacity attenuation rate of the air-conditioning equipment based on the current heat exchange capacity and the rated heat exchange capacity; and controlling whether the air-conditioning equipment starts defrosting based on the current heat exchange capacity attenuation rate.

[0006] Among them, the steps of obtaining the current operating condition of the air-conditioning equipment and obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating condition include: in response to the current operating condition of the air-conditioning equipment being a full-load condition, obtaining the maximum heat exchange capacity of the air-conditioning equipment within a first preset time period, and using the maximum heat exchange capacity as the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating condition; in response to the current operating condition of the air-conditioning equipment being a non-full-load condition, obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating condition based on the current ambient temperature of the air-conditioning equipment, the current indoor temperature and the current frequency of the compressor.

[0007] Among them, the step of obtaining the current operating condition of the air-conditioning equipment includes: obtaining the current frequency of the compressor of the air-conditioning equipment; in response to the current frequency being less than a preset frequency threshold, determining that the current operating condition is a non-full load condition; in response to the current frequency being greater than or equal to the preset frequency threshold, determining that the current operating condition is a full load condition.

[0008] Among them, the step of obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating conditions based on the current ambient temperature of the air-conditioning equipment, the current indoor temperature and the current frequency of the compressor includes: obtaining a preset heat exchange capacity table of the air-conditioning equipment; obtaining the rated heat exchange capacity corresponding to the current ambient temperature, the current indoor temperature and the current frequency from the preset heat exchange capacity table.

[0009] Among them, the step of obtaining the current heat exchange capacity of the air-conditioning equipment includes: constructing a virtual measurement model of the capacity of the air-conditioning equipment; obtaining the operating data of the air-conditioning equipment, wherein the operating data includes ambient temperature, intake temperature, exhaust temperature and frequency of the compressor; and using the operating data as input of the virtual measurement model of the capacity to obtain the current heat exchange capacity of the air-conditioning equipment.

[0010] Among them, the step of controlling whether the air-conditioning equipment starts defrosting based on the current heat exchange capacity decay rate includes: in response to the current heat exchange capacity decay rate being less than the first capacity decay threshold, controlling whether the air-conditioning equipment starts defrosting based on the operating time of the air-conditioning equipment and the fin temperature of the air-conditioning equipment.

[0011] Among them, the step of controlling whether the air-conditioning equipment starts defrosting based on the operating time of the air-conditioning equipment and the fin temperature of the air-conditioning equipment includes: in response to the operating time being greater than the second preset time threshold and the fin temperature being less than the first preset temperature threshold, controlling the air-conditioning equipment to start defrosting; in response to the operating time being greater than the second preset time threshold and the change value of the fin temperature being greater than the second preset temperature threshold, controlling the air-conditioning equipment to start defrosting.

[0012] Among them, the step of controlling whether the air-conditioning equipment starts defrosting based on the operating time of the air-conditioning equipment and the fin temperature of the air-conditioning equipment also includes: in response to the operating time being greater than the second preset time threshold, the fin temperature being greater than or equal to the first preset temperature threshold and the change value of the fin temperature being less than or equal to the second preset temperature threshold, judging whether the current heat exchange capacity decay rate is less than the second capacity decay threshold, wherein the second capacity decay threshold is less than the first capacity decay threshold; in response to the current heat exchange capacity decay rate being less than the second capacity decay threshold, controlling the air-conditioning equipment to start defrosting.

[0013] To solve the above technical problems, another technical solution adopted in the present application is: to provide an air-conditioning device, which includes an indoor unit, an outdoor unit and a controller, wherein the controller is connected to the indoor unit and the outdoor unit, and is used to execute any of the above defrost control methods to defrost the outdoor unit.

[0014] In order to solve the above technical problems, another technical solution adopted by the present application is: providing a computer-readable storage medium, which stores program instructions therein, and the program instructions are executed by a processor to implement any of the above defrost control methods.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the defrost control method of the present application includes: obtaining the current working condition of the air-conditioning equipment, and obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current working condition; obtaining the current heat exchange capacity of the air-conditioning equipment; obtaining the current heat exchange capacity attenuation rate of the air-conditioning equipment based on the current heat exchange capacity and the rated heat exchange capacity; and controlling whether the air-conditioning equipment starts defrosting based on the current heat exchange capacity attenuation rate. In the above manner, the defrost control method of the present application has the adaptability of the working condition, and can accurately identify the defrost demand and defrost timing, thereby improving the accuracy of defrost control and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the first embodiment of the defrost control method of the present application;

[0017] Figure 2 It is a schematic diagram of the change trajectory of the heat exchange capacity of the indoor unit in the air-conditioning device of the present application;

[0018] Figure 3 yes Figure 1 The flowchart of step S101 in the first embodiment;

[0019] Figure 4 yes Figure 1 The flowchart of the second embodiment of step S101 is shown in FIG.

[0020] Figure 5 yes Figure 3 A flow chart of an embodiment of step S202;

[0021] Figure 6 yes Figure 1 A flow chart of an embodiment of step S102;

[0022] Figure 7 It is a schematic diagram of the unit capacity calculation deviation of the capacity virtual measurement model of the indoor unit when the ambient temperature is 4 degrees Celsius;

[0023] Figure 8 It is a schematic diagram of the calculation deviation of the unit capacity attenuation rate of the capacity virtual measurement model of the indoor unit when the ambient temperature is 4 degrees Celsius;

[0024] Fig. 9 It is a schematic diagram of the unit capacity calculation deviation of the capacity virtual measurement model of the indoor unit when the ambient temperature is 0 degrees Celsius;

[0025] Fig.10 It is a schematic diagram of the calculation deviation of the unit capacity attenuation rate of the capacity virtual measurement model of the indoor unit when the ambient temperature is 0 degrees Celsius;

[0026] Fig.11 It is a schematic diagram of the capacity deviation between the virtual measurement model of the indoor unit capacity and the experimental data under various working conditions;

[0027] Fig.12 It is a schematic diagram of the deviation of the capacity attenuation rate between the virtual measurement model of the indoor unit capacity and the experimental data under various working conditions;

[0028] Fig.13 yes Figure 1 A schematic diagram of a flow chart of an embodiment of step S104;

[0029] Fig.14 yes Fig.13 Schematic diagram of the process of step S601 in the first embodiment;

[0030] Fig.15 yes Fig.13 A schematic diagram of the flow chart of the second embodiment of step S601;

[0031] Fig.16 It is a schematic diagram of the working condition of defrosting air-conditioning equipment in the prior art of this application;

[0032] Fig.17 It is a structural schematic diagram of an embodiment of the air conditioning device of the present application;

[0033] Fig.18 It is a structural diagram of an embodiment of a computer-readable storage medium of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] When the air conditioner is heating in winter, the surface temperature of the outdoor unit is low. When the surface temperature is lower than the air dew point and less than 0 degrees, frost will form on the surface of the outdoor unit. When the frost layer on the surface of the outdoor unit reaches a certain thickness, the performance and even safety of the indoor unit will be adversely affected. Therefore, air conditioners are equipped with defrosting systems and corresponding defrosting controls. Defrosting is generally achieved by heating the outdoor unit in a reverse cycle of the indoor unit to melt the frost on the surface.

[0036] Although the defrost control method has undergone certain development and optimization after years of development. However, the current defrost control cannot accurately judge the frosting state and defrosting timing, and there are still many cases of false defrosting. False defrosting includes the following two situations: one is that the outdoor unit is severely frosted but the unit does not start defrosting. At this time, the frost will cause the performance and safety of the indoor unit to be adversely affected; the other is that when the outdoor unit is not frosted, the indoor unit mistakenly thinks that it is frosted and starts defrosting. The indoor unit is generally defrosted by starting the reverse cycle, which will cause the indoor temperature to drop and unnecessary energy waste during reverse cycle defrosting.

[0037] For example, the defrosting methods in the current prior art mainly include the following categories, namely, time control method, time and temperature control method, time, humidity and temperature control method, and defrosting control method based on fan current.

[0038] The time control method is a relatively early and simple control method. It controls the air-conditioning equipment to start defrosting at a fixed time. This method uses a uniform time interval that cannot adapt to changes in the environment in which the air-conditioning is located, so false defrosting often occurs.

[0039] The time and temperature control method refers to the change in the fin surface temperature of the outdoor unit heat exchanger on the basis of the time control method. It is achieved by recording the lowest value of the outdoor unit heat exchanger surface temperature during a period of time when the indoor unit compressor is turned on, and calculating the difference between the lowest value of the surface temperature and the evaporation temperature and the fin surface temperature when the outdoor unit heat exchanger is frosted during the operation of the air-conditioning equipment. When the difference is greater than the control threshold or the evaporation temperature and the fin surface temperature are less than the control threshold when the outdoor unit heat exchanger is frosted, it is considered that the outdoor unit of the air-conditioning equipment is severely frosted and defrosting is started. This method improves the accuracy of defrosting judgment to a certain extent, but this method still has certain false defrosting problems; because a single fin temperature cannot adapt to the changing outdoor environment, and the control parameters of each different outdoor environment condition are not exactly the same. Therefore, this method cannot accurately judge the actual defrosting needs.

[0040] The original intention of the time, humidity and temperature control method is to assume that the frost rate of the outdoor unit of the air-conditioning equipment is different when the outdoor ambient temperature and relative humidity are different. The energy efficiency of different defrost start times is evaluated using energy efficiency indicators in a defrosting cycle. Under such an assumption, there is an optimal defrost time point. This method divides the outdoor environment into light frost area, medium frost area and heavy frost area for separate control. In each frosting area, the optimal defrost time is determined a priori through a large number of experiments, and the defrost time is associated with the environmental conditions. This method does not take into account the impact of the working conditions of the unit, such as different load sizes must have different frosting speeds. In addition, this control method requires the addition of a humidity sensor to the outdoor unit, which increases costs. Therefore, this method also has the problems of low adaptability to working conditions and increased costs.

[0041] The defrost control method based on fan current controls the defrost time based on the change of fan current. When the outdoor unit heat exchanger is frosted, its ventilation flow channel is blocked, which causes the heat exchange effect to deteriorate. In order to provide the same heating capacity, the controller of the air-conditioning equipment needs to increase the air volume and input power of the outdoor unit fan, which leads to an increase in the fan current. In other words, the increase in fan current reflects the blockage of the heat exchanger and the severity of frosting. Therefore, the defrost time can be controlled based on the change of fan current, but this method is strongly related to the control logic of the external fan of the air conditioner. The input power of the external fan of a general air-conditioning equipment does not increase when it is blocked, and the change in its current is not obvious. Therefore, this method is only suitable for specific products and is not universal.

[0042] In order to solve the above problems, the present application first proposes a defrost control method, which is applied to air conditioning equipment. Figure 1 , Figure 1 It is a flow chart of the first embodiment of the defrost control method of the present application.

[0043] like Figure 1 As shown, the defrost control method of this embodiment specifically includes steps S101 to S104:

[0044] Step S101: obtaining the current working condition of the air-conditioning equipment, and obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current working condition.

[0045] See also Figure 2 , Figure 2 Schematic diagram of the heat exchange capacity change trajectory of the indoor unit in the air-conditioning device of the present application. When the load of the air-conditioning device is relatively stable, the heat exchange capacity of the indoor unit of the air-conditioning device after the compressor is started or the heating is turned on is as follows: Figure 2 As shown, at the beginning, the heating capacity of the indoor unit slowly increases to the maximum heating capacity as the compressor frequency increases. After that, due to frosting, the ventilation cross-sectional area of ​​the heat exchanger of the outdoor unit gradually decreases and the heat exchange thermal resistance gradually increases, and the current heating capacity of the indoor unit gradually deviates from the rated heating capacity. When the heating capacity of the air-conditioning equipment slowly decreases to a certain extent, the air-conditioning equipment needs to start defrosting. Therefore, based on the above principle, in this embodiment, this embodiment can evaluate the current frosting state of the outdoor unit of the air-conditioning equipment by dynamically calculating the current heat exchange capacity attenuation rate of the air-conditioning equipment, and control whether the air-conditioning equipment starts defrosting based on the heat exchange capacity attenuation rate.

[0046] Therefore, in this embodiment, before calculating the current heat exchange capacity attenuation rate, it is necessary to first obtain the rated heat exchange capacity of the air-conditioning equipment, and the rated heat exchange capacity is related to the operating conditions of the air-conditioning equipment. Therefore, this embodiment can determine the rated heat exchange capacity of the air-conditioning equipment based on the current operating conditions of the air-conditioning equipment during operation.

[0047] Among them, if the current working condition of the air-conditioning equipment is full-load working condition, the rated heat exchange capacity is the maximum heat exchange capacity of the air-conditioning equipment; if the current working condition of the air-conditioning equipment is not full-load working condition, the rated heat exchange capacity is affected by the current frequency of the compressor of the air-conditioning equipment, the ambient temperature and the indoor temperature, and needs to be obtained by looking up the table based on these three. Among them, the specific method for obtaining the rated heat exchange capacity of the air-conditioning equipment is described below and will not be described in detail here.

[0048] Step S102: Obtain the current heat exchange capacity of the air-conditioning equipment.

[0049] After obtaining the rated heat exchange capacity of the air-conditioning equipment, it is also necessary to obtain the current heat exchange capacity of the air-conditioning equipment. Because the current heat exchange capacity of the air-conditioning equipment changes dynamically over time and cannot be directly measured, in this embodiment, this embodiment needs to calculate according to the relevant operating data of the air-conditioning equipment to obtain the current heat exchange capacity of the air-conditioning equipment. In this embodiment, this embodiment establishes a capacity virtual measurement model of the air-conditioning equipment through the operating data of the air-conditioning equipment and the AI ​​algorithm. After the training and verification of the capacity virtual measurement model of the air-conditioning equipment are completed, the current operating data of the air-conditioning equipment can be input to obtain the current heat exchange capacity of the air-conditioning equipment. Among them, the specific method of obtaining the current heat exchange capacity of the air-conditioning equipment is described as follows and will not be described in detail here.

[0050] Step S103: obtaining the current heat exchange capacity attenuation rate of the air-conditioning equipment based on the current heat exchange capacity and the rated heat exchange capacity.

[0051] After obtaining the rated heat exchange capacity and current heat exchange capacity of the air-conditioning equipment, the current heat exchange capacity attenuation rate of the air-conditioning equipment can be calculated based on formula (1), where formula (1) is as follows:

[0052] ε t =Q t / Q theory (1)

[0053] Among them, ε t Expressed as the current heat transfer capacity decay rate of the air conditioning equipment, Q t Expressed as the current heat transfer capacity of the air conditioning equipment, Q theory Expressed as the rated heat exchange capacity of the air-conditioning equipment.

[0054] In this embodiment, the more severe the frosting of the air-conditioning equipment is, the greater the current heat exchange capacity decay rate ε of the air-conditioning equipment is.t The smaller.

[0055] Step S104: Controlling whether the air-conditioning equipment starts defrosting based on the current heat exchange capacity attenuation rate.

[0056] After calculating and obtaining the front heat exchange capacity decay rate of the air-conditioning equipment, it is possible to control whether the air-conditioning equipment starts defrosting based on the front heat exchange capacity decay rate of the air-conditioning equipment. If the current heat exchange capacity decay rate is greater than or equal to the first capacity decay threshold, the air-conditioning equipment does not start defrosting; if the current heat exchange capacity decay rate is less than the first capacity decay threshold, the air-conditioning equipment is controlled to start defrosting based on the operating time of the air-conditioning equipment and the fin temperature of the air-conditioning equipment. The specific control method is described below and will not be described in detail here. In this embodiment, the first capacity decay threshold can be set based on actual conditions and is not limited here.

[0057] Different from the prior art, the defrost control method of the present application includes: obtaining the current working condition of the air-conditioning equipment, and obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current working condition; obtaining the current heat exchange capacity of the air-conditioning equipment; obtaining the current heat exchange capacity attenuation rate of the air-conditioning equipment based on the current heat exchange capacity and the rated heat exchange capacity; and controlling whether the air-conditioning equipment starts defrosting based on the current heat exchange capacity attenuation rate. In the above manner, the defrost control method of the present application has the adaptability of working conditions, can accurately identify the defrost demand and defrost timing, thereby improving the accuracy of defrost control and reducing energy waste.

[0058] Optionally, the method for obtaining the current working condition of the air-conditioning device and obtaining the rated heat exchange capacity of the air-conditioning device corresponding to the current working condition is as follows: Figure 3 See Figure 3 , Figure 3 yes Figure 1 FIG. 1 is a flow chart of the first embodiment of step S101. Figure 3 As shown, this embodiment can be Figure 3 The steps shown implement the step of obtaining the rated heat exchange capacity of the air-conditioning equipment corresponding to the current working condition in step S101, specifically including steps S201 to S202:

[0059] Step S201: In response to the current operating condition of the air-conditioning equipment being a full-load condition, the maximum heat exchange capacity of the air-conditioning equipment within a first preset time period is obtained, and the maximum heat exchange capacity is used as the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating condition.

[0060] In this embodiment, when obtaining the rated heat exchange capacity of the air-conditioning device, it is necessary to calculate according to the working conditions. When the current working condition of the air-conditioning device is the full load working condition, it means that the current load of the air-conditioning device is greater than or equal to the maximum load. The heat exchange capacity curve of the indoor unit is as follows: Figure 2As shown, under full load conditions, the rated heat exchange capacity of the air-conditioning equipment is the maximum heat exchange capacity after the air-conditioning equipment is turned on and operated. Therefore, the maximum heat exchange capacity within the first preset time period after the air-conditioning equipment compressor is turned on or the four-way valve is powered on can be recorded, and the maximum heat exchange capacity can be used as the rated heat exchange capacity of the air-conditioning equipment corresponding to the current working condition. In this embodiment, the first preset time period can be set to the minimum time required for the air-conditioning equipment to start running and reach the maximum heat exchange capacity. In other embodiments, the first preset time period can also be set based on actual conditions, and there is no limitation here. In addition, if the air-conditioning equipment completes a frosting and defrosting cycle, its rated heat exchange capacity needs to be recalculated.

[0061] Step S202: In response to the current operating condition of the air-conditioning device being a non-full-load operating condition, the rated heat exchange capacity of the air-conditioning device corresponding to the current operating condition is obtained based on the current ambient temperature of the air-conditioning device, the current indoor temperature and the current frequency of the compressor.

[0062] When the current operating condition of the air-conditioning equipment is a non-full load condition, it means that the current load of the air-conditioning equipment is less than the maximum load. At this time, if the rated heat exchange capacity needs to be obtained, it is necessary to query the rated heat exchange capacity of the air-conditioning equipment in the unfrosted state. The rated heat exchange capacity of the air-conditioning equipment is affected by the frequency of the compressor, the ambient temperature and the indoor temperature. Therefore, in this embodiment, the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating condition can be obtained based on the current ambient temperature of the air-conditioning equipment, the current indoor temperature and the current frequency of the compressor.

[0063] Optionally, the method for obtaining the current working condition of the air conditioning equipment is as follows: Figure 4 See Figure 4 , Figure 4 yes Figure 1 FIG. 1 is a flow chart of the second embodiment of step S101. Figure 4 As shown, this embodiment can be Figure 4 The steps shown implement the step of obtaining the current working condition of the air-conditioning equipment in step S101, specifically including steps S301 to S303:

[0064] Step S301: Acquire the current frequency of the compressor of the air-conditioning equipment.

[0065] When obtaining the current working condition of the air-conditioning device, it is necessary to obtain the current frequency of the compressor of the air-conditioning device, because the frequency of the compressor of the air-conditioning device is equal to its maximum frequency under full load conditions; the frequency of the compressor of the air-conditioning device is less than its maximum frequency under non-full load conditions; therefore, in this embodiment, the current frequency of the compressor of the air-conditioning device can be obtained and compared with the preset frequency threshold to obtain the current working condition of the air-conditioning device, wherein the preset frequency threshold can be set to the maximum frequency of the compressor of the air-conditioning device. In other embodiments, the preset frequency threshold can also be set based on actual conditions, which is not limited here.

[0066] Step S302: In response to the current frequency being less than a preset frequency threshold, determining that the current operating condition is a non-full load operating condition.

[0067] If the current frequency of the compressor of the air-conditioning equipment is less than the preset frequency threshold, it can be determined that the current operating condition of the air-conditioning equipment is a non-full-load operating condition.

[0068] Step S303: In response to the current frequency being greater than or equal to the preset frequency threshold, determining that the current operating condition is a full-load operating condition.

[0069] If the current frequency of the compressor of the air-conditioning equipment is greater than or equal to the preset frequency threshold, it can be determined that the current operating condition of the air-conditioning equipment is a non-full-load operating condition.

[0070] Optionally, a method for obtaining the rated heat exchange capacity of the air-conditioning device corresponding to the current working condition based on the current ambient temperature of the air-conditioning device, the current indoor temperature and the current frequency of the compressor is as follows: Figure 5 See Figure 5 , Figure 5 yes Figure 3 FIG. 1 is a flow chart of an embodiment of step S202 in FIG. Figure 5 As shown, this embodiment can be Figure 5 The steps shown implement step S202, which specifically includes steps S401 to S402:

[0071] Step S401: Obtain a preset heat exchange capacity table of the air conditioning equipment.

[0072] When the current working condition of the air conditioner is not full load, it is necessary to obtain the rated heat exchange capacity of the air conditioner corresponding to the current working condition based on the current ambient temperature of the air conditioner, the current indoor temperature and the current frequency of the compressor. In this embodiment, the preset heat exchange capacity table of the air conditioner under the influence of these three factors can be determined by experiment or simulation.

[0073] Step S402: Obtain the rated heat exchange capacity corresponding to the current ambient temperature, the current indoor temperature and the current frequency from a preset heat exchange capacity table.

[0074] After obtaining the preset heat exchange capacity table, the rated heat exchange capacity of the air conditioner corresponding to the current ambient temperature, the current indoor temperature and the current frequency can be obtained from the preset heat exchange capacity table; if it cannot be directly queried in the table, it can be obtained through linear interpolation. Among them, the preset heat exchange capacity table of the air conditioner needs to be determined a priori, and the preset heat exchange capacity table needs to be saved in the controller of the air conditioner to facilitate real-time query of the rated heat exchange capacity of the air conditioner.

[0075] Optionally, the method for obtaining the current heat exchange capacity of the air conditioning equipment is as follows: Figure 6 See Figure 6 , Figure 6 yes Figure 1 FIG. 1 is a flow chart of an embodiment of step S102 in FIG. Figure 6 As shown, this embodiment can be Figure 6 The steps shown implement step S102, which specifically includes steps S501 to S503:

[0076] Step S501: constructing a capacity virtual measurement model of the air conditioning equipment.

[0077] In this embodiment, if it is necessary to obtain the current heat exchange capacity of the air-conditioning equipment, it is necessary to construct a capacity virtual measurement model of the air-conditioning equipment. The air-conditioning equipment includes an outdoor unit and an indoor unit. In this embodiment, taking the indoor unit as an example, this embodiment can construct a capacity virtual measurement model of the indoor unit, wherein the process of establishing the capacity virtual measurement model of the indoor unit includes feature selection, model training and model testing. The process of constructing the capacity virtual measurement model of the indoor unit in this embodiment involves the following steps: 1. Screen out features that are strongly correlated with the heat exchange capacity of the indoor unit through correlation analysis, including but not limited to the ambient temperature T 4 , suction temperature T suc , Exhaust temperature T dis and compressor frequency F rz ; 2. Construct nonlinear features of related measuring points, such as but not limited to square terms, exponential terms, logarithmic terms and other features. 3. Construct polynomial cross features based on 1 and 2. 4. Collect experimental data to construct training data and test data. The data set should contain diverse data of multiple working conditions. 5. Modeling, using a gradient-based optimization algorithm to solve the model parameters, the objective function refers to formula (3). The loss function consists of two parts. The first part is the square loss between the model prediction value and the experimental value, and the second part is the penalty function that measures the complexity of the model. 6. Determine the optimal parameters of the model through cross-validation. Finally, we come to the capability virtual measurement model, where the calculation method of the capability virtual measurement model is shown in formula (2), and the calculation method of the model parameters is shown in formula (3). Formula (2) and formula (3) are specifically as follows:

[0078] Q t =f(T4 , T suc , T dis , F rz ) (2)

[0079]

[0080] Among them, Q t represents the current heating capacity of the indoor unit, f(*) represents the implicit function relationship, T 4 Indicates the current ambient temperature, T suc Indicates that the current temperature is the suction temperature, T dis Expressed as exhaust temperature, F rz It is represented by the current frequency of the compressor, λ is the coefficient of the trade-off capability virtual measurement model’s empirical loss and structural loss, which is obtained through cross-validation, y is the variable to be predicted, X is the input matrix, β is the model coefficient, and N is the number of training sets.

[0081] In this embodiment, the capacity virtual measurement model of the indoor unit is a nonlinear polynomial model including 13 components, which can be run on the controller of the air-conditioning equipment.

[0082] See also Figures 7 to 10 , Figure 7 It is a schematic diagram of the unit capacity calculation deviation of the capacity virtual measurement model of the indoor unit when the ambient temperature is 4 degrees Celsius; Figure 8 It is a schematic diagram of the calculation deviation of the unit capacity attenuation rate of the capacity virtual measurement model of the indoor unit when the ambient temperature is 4 degrees Celsius; Fig. 9 It is a schematic diagram of the unit capacity calculation deviation of the capacity virtual measurement model of the indoor unit when the ambient temperature is 0 degrees Celsius; Fig.10 This is a schematic diagram of the calculation deviation of the unit capacity attenuation rate of the indoor unit capacity virtual measurement model when the ambient temperature is 0 degrees Celsius. Figure 7 and Fig. 9 In the figure, red indicates the capacity of the indoor unit under test, and black indicates the model calculation. In this application, the model calculation is the unit capacity of the virtual measurement model of the indoor unit capacity of this embodiment; the indoor unit under test capacity is the test data of the actual heating capacity of the indoor unit; Figure 8 and Fig.10 In the figure, red represents the capacity attenuation of the indoor unit, and black represents the capacity attenuation calculated by the model. In the present application, the capacity attenuation calculated by the model is the current heating capacity attenuation rate calculated by the capacity virtual measurement model of the indoor unit of this embodiment; the capacity attenuation of the indoor unit is the test data of the actual capacity attenuation of the indoor unit.

[0083] like Figure 7As shown, when the ambient temperature is 4 degrees Celsius, the average relative error of the unit capacity is 0.9% when the current heating capacity calculated by the capacity virtual measurement model of the indoor unit in this embodiment is compared with the test data of the actual heating capacity of the indoor unit; Figure 8 As shown, when the ambient temperature is 4 degrees Celsius, the relative error of the unit capacity attenuation rate is 1.0% when the current heating capacity attenuation rate obtained by this embodiment is compared with the test data of the actual capacity attenuation rate of the indoor unit; Fig. 9 As shown, when the ambient temperature is 0 degrees Celsius, the average relative error between the current heating capacity calculated by the capacity virtual measurement model of the indoor unit in this embodiment and the test data of the actual heating capacity of the indoor unit is 1.0%; Fig.10 As shown, when the ambient temperature is 0 degrees Celsius, the relative error of the capacity attenuation rate of the current heating capacity attenuation rate obtained by this embodiment is 1.3% compared with the test data of the actual capacity attenuation rate of the indoor unit.

[0084] See also Fig.11 and Fig.12 , Fig.11 It is a schematic diagram of the capacity deviation between the virtual measurement model of the indoor unit capacity and the experimental data under various working conditions; Fig.12 is a schematic diagram of the capacity attenuation rate deviation between the virtual measurement model of the indoor unit capacity and the experimental data under various working conditions. Fig.11 and Fig.12 In the figure, the data driver represents the data obtained by the capacity virtual measurement model of the indoor unit of this embodiment; the experimental data is the data obtained by the compressor MAP model.

[0085] like Fig.11 As shown, when calculating the current heating capacity of the indoor unit, the average relative deviation of the capacity virtual measurement model of the indoor unit unit in this embodiment is 1.1%, while the average relative deviation of the compressor MAP model is 5.4%; Fig.12 As shown, when calculating the current heating capacity attenuation rate of the indoor unit, the average relative deviation of the indoor unit capacity virtual measurement model of this embodiment is 1.2%, while the average relative deviation of the compressor MAP model is 1.8%.

[0086] Depend on Figures 7 to 12 It can be seen that the capacity virtual measurement model of the indoor unit of this embodiment has been widely verified under multiple working conditions, and its accuracy meets the control requirements.

[0087] Step S502: Acquire the operating data of the air conditioning equipment, wherein the operating data includes the ambient temperature, the intake temperature, the exhaust temperature and the frequency of the compressor.

[0088] Taking the virtual measurement model of the indoor unit capacity as an example, after the virtual measurement model of the indoor unit capacity is established and trained, the operating data of the air-conditioning equipment can be obtained, where the operating data includes ambient temperature, intake temperature, exhaust temperature and frequency of the compressor; in this embodiment, the ambient temperature, intake temperature and exhaust temperature of the air-conditioning equipment can be directly measured by the sensors of the air-conditioning equipment, and the frequency of the compressor is obtained through the controller output of the air-conditioning equipment.

[0089] Step S503: using the operating data as input of the capacity virtual measurement model to obtain the current heat exchange capacity of the air-conditioning equipment.

[0090] Taking the indoor unit capacity virtual measurement model as an example, after obtaining the operating data of the air-conditioning equipment, the operating data is used as the input of the capacity virtual measurement model to obtain the current heating capacity of the indoor unit.

[0091] In other embodiments, when calculating the current heat exchange capacity of the air-conditioning equipment, a capacity virtual measurement model of the outdoor unit may also be constructed, wherein the capacity virtual measurement model of the outdoor unit may also be constructed according to the above method, wherein the input features of the capacity virtual measurement model are also the ambient temperature T4, the suction temperature Tsuc, the exhaust temperature Tdis and the compressor frequency Frz. The process of constructing the capacity virtual measurement model of the outdoor unit in this embodiment involves the following steps: 1. Screening out features that are strongly correlated with the heat exchange capacity of the outdoor unit through correlation analysis, including but not limited to the ambient temperature T4, the suction temperature Tsuc, the exhaust temperature Tdis and the compressor frequency Frz. 4 , suction temperature T suc , Exhaust temperature T dis and compressor frequency F rz ; 2. Construct nonlinear features of related measuring points, such as but not limited to square terms, exponential terms, logarithmic terms and other features. 3. Construct polynomial cross features based on 1 and 2. 4. Collect experimental data to construct training data and test data. The data set should contain diverse data of multiple working conditions. 5. Modeling, using a gradient-based optimization algorithm to solve the model parameters, the objective function refers to formula (3). The loss function consists of two parts. The first part is the square loss of the model prediction value and the experimental value, and the second part is the penalty function that measures the complexity of the model. 6. Determine the optimal parameters of the model through cross-validation. Its calculation expression is shown in formula (4):

[0092] Q t '=g(T 4 , T suc , T dis , F rz ) (4)

[0093] Among them, Q t ' represents the current heating capacity of the outdoor unit, g(*) represents the implication of another functional relationship, T 4Indicates the current ambient temperature, T suc Indicates that the current temperature is the suction temperature, T dis Expressed as exhaust temperature, F rz It is represented by the current frequency of the compressor; in addition, the principle of the virtual measurement model of the outdoor unit's capacity is the same as the previous one and will not be repeated here.

[0094] In other embodiments, when calculating the current heat exchange capacity of the air-conditioning equipment, the compressor MAP model can also be used for calculation, such as calculating the refrigerant flow rate based on the saturation temperature of the condenser and the evaporator and the compressor frequency, and then calculating the current heat exchange capacity based on the enthalpy difference between the inlet and outlet of the condenser; or calculating the cooling capacity of the refrigeration evaporator and the compressor power based on the saturation temperature of the condenser and the evaporator and the compressor frequency, and then calculating the current heat exchange capacity.

[0095] Optionally, a method for controlling whether to start defrosting of an air conditioning device based on the current heat exchange capacity attenuation rate is as follows: Fig.13 See Fig.13 , Fig.13 yes Figure 1 FIG. 1 is a flow chart of an embodiment of step S104 in FIG. Fig.13 As shown, this embodiment can be Fig.13 The steps shown implement step S104, which specifically includes steps S601 to S602:

[0096] Step S601: In response to the current heat exchange capacity decay rate being less than the first capacity decay threshold, the air-conditioning device is controlled to start defrosting based on the operating time of the air-conditioning device and the fin temperature of the air-conditioning device.

[0097] After calculating and obtaining the current heat exchange capacity attenuation rate of the air conditioner, the current heat exchange capacity attenuation rate can be compared with the first capacity attenuation threshold; if the current heat exchange capacity attenuation rate is less than the first capacity attenuation threshold, it is considered that the current air conditioner has a large heat exchange capacity attenuation, and the outdoor unit of the air conditioner is in a potential frosting state. At this time, it is necessary to control whether the air conditioner starts defrosting based on the operating time of the air conditioner and the fin temperature of the air conditioner. Among them, the first capacity attenuation threshold can be set based on actual conditions and is not limited here.

[0098] Step S602: In response to the current heat exchange capacity decay rate being greater than or equal to the first capacity decay threshold, the air conditioning device does not start defrosting.

[0099] If the current heat exchange capacity attenuation rate is greater than the first capacity attenuation threshold, it is considered that the current unit has no frost or is only slightly frosted, which does not affect the performance of the unit and user comfort. The air-conditioning equipment does not need to perform defrosting or stop defrosting.

[0100] Optionally, a method for controlling whether to start defrosting of the air-conditioning device based on the running time of the air-conditioning device and the fin temperature of the air-conditioning device is as follows: Fig.14 See Fig.14 , Fig.14 yes Fig.13 FIG. 1 is a flow chart of the first embodiment of step S601. Fig.14 As shown, this embodiment can be Fig.14 The steps shown implement step S601, which specifically includes steps S701 to S702:

[0101] Step S701: In response to the current heat exchange capacity decay rate being less than the first capacity decay threshold, and in response to the operating time being greater than the second preset time threshold and the fin temperature being less than the first preset temperature threshold, the air conditioning device is controlled to start defrosting.

[0102] If the current heat exchange capacity attenuation rate is less than the first capacity attenuation threshold, the operating time of the air-conditioning equipment is greater than the second preset time threshold, and the fin temperature of the outdoor unit of the air-conditioning equipment is less than the first preset temperature threshold, it is considered that the outdoor unit is severely frosted, and the air-conditioning equipment needs to be controlled to start defrosting, wherein the second preset time threshold and the first preset temperature threshold can be set based on actual conditions and are not limited here.

[0103] Step S702: In response to the current heat exchange capacity decay rate being less than the first capacity decay threshold, in response to the operating time being greater than the second preset time threshold and the fin temperature change being greater than the second preset temperature threshold, the air conditioning device is controlled to start defrosting.

[0104] If the current heat exchange capacity attenuation rate is less than the first capacity attenuation threshold, the operating time of the air-conditioning equipment is greater than the second preset time threshold, and the fin temperature change value of the outdoor unit of the air-conditioning equipment is greater than the second preset temperature threshold, then it is also considered that the outdoor unit is severely frosted, and the air-conditioning equipment needs to be controlled to start defrosting, where the second preset temperature threshold can also be set based on actual conditions and is not limited here.

[0105] Optionally, a method for controlling whether to start defrosting of the air-conditioning device based on the running time of the air-conditioning device and the fin temperature of the air-conditioning device is as follows: Fig.15 See Fig.15 , Fig.15 yes Fig.13 FIG. 1 is a flow chart of the second embodiment of step S601. Fig.15 As shown, this embodiment also includes step S801 to step S802:

[0106] Step S801: In response to the operating time being greater than the second preset time threshold, the fin temperature being greater than or equal to the first preset temperature threshold, and the change value of the fin temperature being less than or equal to the second preset temperature threshold, it is determined whether the current heat exchange capacity decay rate is less than the second capacity decay threshold; wherein the second capacity decay threshold is less than the first capacity decay threshold.

[0107] In this embodiment, if the current heat exchange capacity decay rate is less than the first capacity decay threshold, the operating time of the air-conditioning equipment is greater than the second preset time threshold, but the fin temperature of the outdoor unit of the air-conditioning equipment is greater than or equal to the first preset temperature threshold and the change value of the fin temperature is less than or equal to the second preset temperature threshold, that is, the fin temperature of the outdoor unit of the air-conditioning equipment does not meet the temperature conditions of steps S701 and S702 in the previous text, then it is considered that the fin temperature sensor of the outdoor unit of the air-conditioning equipment may be faulty. At this time, it is necessary to compare the current heat exchange capacity decay rate with the second capacity decay threshold, and the second capacity decay threshold is less than the first capacity decay threshold.

[0108] Step S802: In response to the current heat exchange capacity decay rate being less than the second capacity decay threshold, the air conditioning device is controlled to start defrosting.

[0109] If the current heat exchange capacity attenuation rate is less than the second capacity attenuation threshold, it is considered that the fin temperature sensor of the outdoor unit of the air-conditioning equipment is faulty, and the outdoor unit is currently severely frosted, so the air-conditioning equipment needs to be controlled to start defrosting. If the current heat exchange capacity attenuation rate is not less than the second capacity attenuation threshold, the air-conditioning equipment does not start defrosting.

[0110] See also Fig.16 , Fig.16 This is a schematic diagram of the working condition of defrosting air conditioning equipment in the prior art of this application; Fig.16 As shown, Fig.16 The areas above the middle dashed line are the false defrosting conditions that occur in the prior art. Under these conditions, the heat exchanger of the outdoor unit of the air-conditioning equipment is not frosted, but the prior art mistakenly believes that it is frosted and starts the defrosting action. The defrosting control method of the present application uses a unified capacity attenuation threshold for control, thereby avoiding the above-mentioned false defrosting conditions. Therefore, compared with the prior art, the defrosting control method of the present application can more accurately defrost and eliminate false defrosting.

[0111] In summary, different from the prior art, the defrost control method of the present application, on the basis of the prior art, incorporates the heat exchange capacity attenuation that reflects the actual frosting state, and can more accurately and comprehensively judge the defrost demand. Since the law that the capacity attenuation caused by frosting of the outdoor unit is consistent when the outdoor environment changes, the present application can adopt a unified capacity attenuation threshold for control. And the defrost control method of the present application is adaptive to the working conditions. The defrost control method of the present application does not require the addition of additional sensors, and the heat exchange capacity attenuation of the air-conditioning equipment can be calculated through existing sensors and algorithm models. The defrost control method of the present application is not only applicable to air source heat pumps, but also to air-conditioning equipment products such as multi-split units, and there are no specific requirements for the control logic of components such as fans. In addition, the algorithm accuracy of the heat exchange capacity virtual measurement model of the present application is high and the complexity is low, and it can be deployed in the controller of the air conditioner.

[0112] Optionally, the present application further proposes an air conditioning device. Fig.17 , Fig.17 Schematic diagram of the structure of an embodiment of the air conditioning device of the present application. Fig.17 As shown, the air conditioning device 100 of this embodiment includes an indoor unit 10, an outdoor unit 20 and a controller 30. The controller 30 is connected to the indoor unit 10 and the outdoor unit 20, and is used to execute the defrost control method of any of the above embodiments to defrost the outdoor unit.

[0113] Optionally, the present application further proposes a computer-readable storage medium. Fig.18 , Fig.18 It is a structural diagram of an embodiment of a computer-readable storage medium of the present application.

[0114] The computer-readable storage medium 200 of the embodiment of the present application stores program instructions 210 therein, and the program instructions 210 are executed by a processor to implement the defrost control method of any of the above embodiments.

[0115] Among them, the program instructions 210 can form a program file and be stored in the above-mentioned storage medium in the form of a software product, so that an electronic device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) executes all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes, or terminal devices such as computers, servers, mobile phones, tablets, etc.

[0116] The computer-readable storage medium 200 of this embodiment may be, but is not limited to, a USB flash drive, an SD card, a PD optical drive, a mobile hard disk, a large-capacity floppy drive, a flash memory, a multimedia memory card, a server, and the like.

[0117] In one embodiment, a computer program product or computer program is provided, the computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device performs the steps in the above-mentioned method embodiments.

[0118] In addition, if the above functions are implemented in the form of software functions and sold or used as independent products, they can be stored in a storage medium readable by a mobile terminal, that is, the present application also provides a storage device storing program data, the program data can be executed to implement the method of the above embodiment, and the storage device can be, for example, a USB flash drive, an optical disk, a server, etc. In other words, the present application can be embodied in the form of a software product, which includes a number of instructions for enabling a smart terminal to execute all or part of the steps of the method described in each embodiment.

[0119] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0120] Any process or method description in a flowchart or otherwise described herein may be understood to represent a mechanism, segment or portion of a code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0121] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (which can be a personal computer, server, network device or other system that can fetch instructions from the instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0122] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents 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 defrosting control method, characterized in that: Applied to air conditioning equipment, the defrost control method includes: Acquire the current working condition of the air-conditioning equipment, and acquire the rated heat exchange capacity of the air-conditioning equipment corresponding to the current working condition; Obtaining the current heat exchange capacity of the air conditioning equipment; Obtaining a current heat exchange capacity attenuation rate of the air conditioning device based on the current heat exchange capacity and the rated heat exchange capacity; Based on the current heat exchange capacity attenuation rate, the air conditioning device is controlled to start defrosting.

2. The defrosting control method according to claim 1, characterized in that: The step of obtaining the current working condition of the air-conditioning device and obtaining the rated heat exchange capacity of the air-conditioning device corresponding to the current working condition comprises: In response to the current operating condition of the air-conditioning device being a full-load operating condition, obtaining a maximum heat exchange capacity of the air-conditioning device within a first preset time period, and using the maximum heat exchange capacity as a rated heat exchange capacity of the air-conditioning device corresponding to the current operating condition; In response to the current operating condition of the air-conditioning equipment being a non-full-load operating condition, the rated heat exchange capacity of the air-conditioning equipment corresponding to the current operating condition is obtained based on the current ambient temperature of the air-conditioning equipment, the current indoor temperature and the current frequency of the compressor.

3. The defrosting control method according to claim 2, characterized in that: The step of obtaining the current working condition of the air conditioning equipment comprises: Obtaining a current frequency of a compressor of the air conditioning device; In response to the current frequency being less than a preset frequency threshold, determining that the current operating condition is a non-full load operating condition; In response to the current frequency being greater than or equal to a preset frequency threshold, it is determined that the current operating condition is a full-load operating condition.

4. The defrosting control method according to claim 2, characterized in that: The step of obtaining the rated heat exchange capacity of the air-conditioning device corresponding to the current working condition based on the current ambient temperature of the air-conditioning device, the current indoor temperature and the current frequency of the compressor comprises: Obtaining a preset heat exchange capacity table of the air conditioning equipment; The rated heat exchange capacity corresponding to the current ambient temperature, the current indoor temperature and the current frequency is obtained from the preset heat exchange capacity table.

5. The defrosting control method according to claim 1, characterized in that: The step of obtaining the current heat exchange capacity of the air conditioning equipment comprises: Constructing a virtual measurement model of the capacity of the air conditioning equipment; Acquiring operating data of the air conditioning equipment, wherein the operating data includes ambient temperature, suction temperature, exhaust temperature and frequency of the compressor; The operating data is used as an input of the capacity virtual measurement model to obtain the current heat exchange capacity of the air conditioning equipment.

6. The defrosting control method according to claim 1, characterized in that: The step of controlling whether to start defrosting of the air conditioning device based on the current heat exchange capacity attenuation rate comprises: In response to the current heat exchange capacity decay rate being less than a first capacity decay threshold, the air conditioning device is controlled to start defrosting based on the operating time of the air conditioning device and the fin temperature of the air conditioning device.

7. The defrosting control method according to claim 6, characterized in that: The step of controlling whether to start defrosting of the air-conditioning device based on the running time of the air-conditioning device and the fin temperature of the air-conditioning device comprises: In response to the running time being greater than a second preset time threshold and the fin temperature being less than a first preset temperature threshold, controlling the air conditioning device to start defrosting; In response to the running time being greater than a second preset time threshold and the change value of the fin temperature being greater than a second preset temperature threshold, the air conditioning device is controlled to start defrosting.

8. The defrosting control method according to claim 7, characterized in that: The step of controlling whether to start defrosting of the air-conditioning device based on the running time of the air-conditioning device and the fin temperature of the air-conditioning device further includes: In response to the operating time being greater than a second preset time threshold, the fin temperature being greater than or equal to the first preset temperature threshold, and the change value of the fin temperature being less than or equal to the second preset temperature threshold, determining whether the current heat exchange capacity decay rate is less than a second capacity decay threshold, wherein the second capacity decay threshold is less than the first capacity decay threshold; In response to the current heat exchange capacity decay rate being less than the second capacity decay threshold, the air conditioning device is controlled to start defrosting.

9. An air conditioning device, characterized in that: It comprises an indoor unit, an outdoor unit and a controller, wherein the controller is connected to the indoor unit and the outdoor unit and is used to execute the defrost control method according to any one of claims 1 to 8 to defrost the outdoor unit.

10. A computer-readable storage medium, characterized in that: Program instructions are stored therein, and the program instructions are executed to implement the defrost control method according to any one of claims 1 to 8.

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