Air conditioner defrosting method and device, storage medium and air conditioner

Abstract

The invention provides an air conditioner defrosting method and device, a storage medium and an air conditioner. When the air conditioner is in a heating mode, the temperature of an outdoor heat exchanger is obtained, and when the temperature of the outdoor heat exchanger is smaller than or equal to an outdoor heat exchanger temperature threshold value, first detection data of target defrosting parameters of the air conditioner within target heating operation time is obtained; and after the target heating operation time, second detection data of the target defrosting parameters are obtained, smoothing processing is conducted on the second detection data based on the first detection data, then whether the defrosting condition is met or not is determined according to the second detection data obtained after smoothing processing, and when the defrosting condition is met, the air conditioner is controlled to start defrosting. According to the method, the problem of air conditioner defrosting false triggering caused by data fluctuation can be avoided, and accurate defrosting of the air conditioner is achieved.

Description

Technical Field

[0001] This invention relates to the field of air conditioners, and in particular to an air conditioner defrosting method, apparatus, storage medium, and air conditioner. Background Technology

[0002] Existing air conditioner defrosting methods typically involve monitoring the air conditioner's operating parameters, comparing these parameters with preset threshold values, and then controlling the air conditioner to defrost based on the comparison results.

[0003] However, air conditioners are easily affected by external environment or other factors during operation, which can cause changes in operating parameters. Existing air conditioner defrosting methods are prone to false triggering of defrosting. Summary of the Invention

[0004] This application provides an air conditioner defrosting method, apparatus, storage medium, and air conditioner, which can avoid the problem of false triggering of defrosting.

[0005] In a first aspect, embodiments of this application provide a defrosting method for an air conditioner, including: When the air conditioner is in heating mode, obtain the outdoor heat exchanger temperature; If the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, the first detection data of the target defrost parameter of the air conditioner during the target heating operation time is obtained. After the target heating operation time, second detection data of the target defrosting parameters are acquired, and the second detection data is smoothed based on the first detection data; Based on the second detection data after smoothing, determine whether the defrosting conditions are met; When the defrosting conditions are met, the air conditioner is controlled to defrost. Secondly, embodiments of this application provide an air conditioner defrosting device, comprising: The outdoor heat exchanger temperature acquisition module is used to acquire the outdoor heat exchanger temperature when the air conditioner is in heating mode. The detection data acquisition module is used to acquire the first detection data of the target defrosting parameters of the air conditioner during the target heating operation time if the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold. The detection data processing module is used to acquire second detection data of the target defrosting parameters after the target heating operation time and to smooth the second detection data based on the first detection data. The defrosting condition determination module is used to determine whether the defrosting conditions are met based on the smoothed second detection data. The defrosting module is used to control the air conditioner to defrost when defrosting conditions are met. Thirdly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the air conditioner defrosting method as described in any of the above claims.

[0006] Fourthly, embodiments of this application provide an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable by the processor; When the processor executes the computer program, it implements the steps of the air conditioner defrosting method as described in any of the above.

[0007] In this embodiment, when the air conditioner is in heating mode, the outdoor heat exchanger temperature is acquired. When the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, the first detection data of the target defrost parameter of the air conditioner during the target heating operation time is acquired. After the target heating operation time, the second detection data of the target defrost parameter is acquired, and the second detection data is smoothed based on the first detection data. Then, the defrost condition is determined based on the smoothed second detection data. When the defrost condition is met, the air conditioner is controlled to enter defrost mode. This application can avoid the problem of false triggering of defrost by the air conditioner due to data fluctuations and achieve precise defrosting of the air conditioner.

[0008] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a flowchart of an air conditioner defrosting method according to one embodiment of the present invention; Figure 2 This is a flowchart of step S130 in one embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the smoothing process of the second detection data in one embodiment of the present invention; Figure 4 This is a schematic diagram of an air conditioner according to one embodiment of the present invention; Figure 5 This is a flowchart of an air conditioner defrosting method according to another embodiment of the present invention; Figure 6 This is a flowchart of an air conditioner defrosting method according to another embodiment of the present invention; Figure 7 This is a flowchart of an air conditioner defrosting method according to another embodiment of the present invention; Figure 8 This is a schematic diagram of an air conditioner defrosting device according to one embodiment of the present invention; Figure 9 This is a schematic diagram of an air conditioner according to one embodiment of the present invention. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0011] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0012] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0013] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0014] Furthermore, in the description of this application, unless otherwise stated, "several" refers to two or more. "And / or" describes the correspondence between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0015] This application provides a defrosting method for air conditioners, which can be applied to air conditioners to achieve defrosting control. The air conditioners included in this application include, but are not limited to, wall-mounted air conditioners, floor-standing air conditioners, and multi-split air conditioners.

[0016] like Figure 1 As shown in the figure, this application provides a defrosting method for an air conditioner, including: S110: When the air conditioner is in heating mode, obtain the outdoor heat exchanger temperature; The temperature of the outdoor heat exchanger can be obtained through temperature detection devices such as temperature sensors installed on the outdoor heat exchanger.

[0017] S120: If the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, obtain the first detection data of the target defrost parameter of the air conditioner within the target heating time. By comparing the outdoor heat exchanger temperature with the outdoor heat exchanger temperature threshold, it is determined whether there is a possibility of frost formation based on the outdoor heat exchanger temperature, and then it is determined whether the air conditioner needs to be defrosted.

[0018] The traditional method for determining the risk of frost formation is to detect whether the outdoor ambient temperature is lower than the outdoor ambient temperature threshold. However, since the heat exchange efficiency of the heat exchangers of different air conditioners is different, their surface temperatures are also different. If the risk of frost formation is determined based on the outdoor ambient temperature, there may be a problem where air conditioner A frosts while air conditioner B does not under the same outdoor ambient temperature, leading to inaccurate defrosting judgment.

[0019] For air conditioners with high heat exchange efficiency, the surface temperature of the heat exchanger may be above 0 degrees Celsius, with no or low risk of frosting. Conversely, for air conditioners with low heat exchange efficiency, the surface temperature of the heat exchanger may be below 0 degrees Celsius, posing a risk of frosting. This application determines the risk of frosting by detecting the outdoor heat exchanger temperature and comparing it to a threshold temperature. Compared to determining the risk based on the outdoor ambient temperature, this method is more accurate and has greater universality. The outdoor heat exchanger temperature threshold can be set according to the air conditioner's unit characteristics and the actual application scenario. In this embodiment, the outdoor heat exchanger temperature threshold can be set to 0 degrees Celsius.

[0020] Specifically, when the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, the possibility of frost formation is determined, and the target defrosting parameters are further detected to determine whether defrosting is required; if the outdoor heat exchanger temperature is greater than the outdoor heat exchanger temperature threshold, there is no possibility of frost formation, and defrosting is not required. There is no need to detect the target defrosting parameters and make a defrosting judgment, which can save computing resources and avoid the problem of "defrosting without frost".

[0021] The target heating operation time can be a set operating time preset by the user. When the air conditioner's heating operation time is less than the target heating operation time, there is no need to determine whether the air conditioner needs to defrost. The target heating operation time can be the minimum heating operation time of the air conditioner, which can ensure that the air conditioner has a minimum heating operation time and avoid misjudging the timing of defrosting.

[0022] The target defrost parameter is used to determine whether the air conditioner needs defrosting.

[0023] The target defrosting parameters can be environmental parameters and / or air conditioner operating parameters related to frost formation. For example, target defrosting parameters can be fan current, heating capacity, heat exchanger inlet pipe temperature, and low-pressure saturation temperature.

[0024] S130: After the target heating operation time, acquire the second detection data of the target defrosting parameters and smooth the second detection data based on the first detection data; When the heating operation time of the air conditioner is greater than or equal to the target heating operation time, it is determined whether defrosting is required based on the second detection data of the target defrosting parameter.

[0025] Optionally, existing filtering algorithms such as the Savitzky-Golay algorithm can be used to smooth the second detection data, correct the data and remove outliers, so as to avoid data fluctuations in the collected second detection data caused by changes in the external environment during the actual operation of the air conditioner, which would affect the accuracy of the defrosting judgment.

[0026] S140: Determine whether the defrosting conditions are met based on the second detection data after smoothing. Defrosting conditions are used to determine whether defrosting of the air conditioner needs to be controlled.

[0027] The defrosting conditions can be set according to actual needs. For example, the defrosting conditions can be set to the second detection data being greater than a set data threshold.

[0028] S150: When the defrosting conditions are met, control the air conditioner to defrost.

[0029] Controlling the defrosting of an air conditioner can be done by controlling the air conditioner to operate in defrost mode. In defrost mode, the outdoor heat exchanger of the air conditioner is converted into a condenser, and the indoor heat exchanger is converted into an evaporator, thereby increasing the temperature of the outdoor unit and achieving defrosting of the outdoor unit.

[0030] The defrosting process of the air conditioner defrosting method in this embodiment is as follows: When the air conditioner is detected to be in heating mode, the outdoor heat exchanger temperature is monitored. If the outdoor heat exchanger temperature is higher than the outdoor heat exchanger temperature threshold, the air conditioner is determined to be in frost-free mode and defrosting detection is not required. If the outdoor heat exchanger temperature is lower than or equal to the outdoor heat exchanger temperature threshold, it is determined that the air conditioner may be frosting. First detection data of the target defrosting parameters for the target heating time is obtained. After the target heating time, second detection data of the target defrosting parameters is obtained. The second detection data is smoothed based on the first detection data to remove outliers caused by data fluctuations.

[0031] In this embodiment, when the air conditioner is in heating mode, the outdoor heat exchanger temperature is acquired. When the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, the first detection data of the target defrost parameter of the air conditioner during the target heating operation time is acquired. After the target heating operation time, the second detection data of the target defrost parameter is acquired, and the second detection data is smoothed based on the first detection data. Then, the defrost condition is determined based on the smoothed second detection data. When the defrost condition is met, the air conditioner is controlled to enter defrost mode. This application can avoid the problem of false triggering of defrost by the air conditioner due to data fluctuations and achieve precise defrosting of the air conditioner.

[0032] like Figure 2 As shown, in one embodiment, smoothing the second detection data based on the first detection data includes: S131: Based on the first detection data, construct a fitting curve for the target defrosting parameters; The target defrosting parameter fitting curve can be obtained based on least squares fitting or other existing curve fitting algorithms. The target defrosting parameter fitting curve can reflect the changing trend of the data.

[0033] S132: Based on the fitting curve of the target defrosting parameters, the second detection data is smoothed.

[0034] Specifically, the second detection data can be corrected based on the fitting curve of the target defrosting parameters, or outliers can be removed based on the fitting curve of the target defrosting parameters, thereby achieving smooth processing of the second detection data.

[0035] In this embodiment, the second detection data is smoothed based on the Savitzky-Golay algorithm. The Savitzky-Golay algorithm (SG filtering for short) is a digital filtering and smoothing technique that uses a polynomial to perform least-squares fitting on the data points within the sliding window, and then uses the fitted polynomial to calculate the smoothed value (or derivative value) of the current point. The Savitzky-Golay algorithm can reduce noise and fluctuations while preserving the original signal characteristics (such as peak height, width and shape).

[0036] like Figure 3 As shown, this is a schematic diagram of smoothing the second detection data in one embodiment. The blue line in the figure represents the original detection data, and the red line represents the detection data processed based on the Savitzky-Golay algorithm, which can effectively remove data fluctuations.

[0037] In this embodiment, the second detection data of fan current and heating capacity can be smoothed based on the Savitzky-Golay algorithm to remove data fluctuation values ​​and reduce the possibility of false defrosting judgments.

[0038] like Figure 4 As shown, it is a schematic diagram of an air conditioner according to an embodiment of this application; the air conditioner includes a compressor 1, an oil separator 2, a four-way reversing valve 3, an indoor heat exchanger 4, an electronic expansion valve 5, an outdoor heat exchanger 6, an outdoor fan 7, and a gas-liquid separator 8.

[0039] The exhaust port of compressor 1 is connected to the inlet of four-way reversing valve 3 via oil separator 2, and the outlet of four-way reversing valve 3 is connected to the inlet of compressor 1 via gas-liquid separator 8; the other two ports of four-way reversing valve 2 are connected to the first port of indoor heat exchanger 4 and the second port of outdoor heat exchanger 6 respectively; the second port of indoor heat exchanger 4 is connected to the first port of outdoor heat exchanger 6 via throttling device 5.

[0040] In one embodiment, the target defrosting parameters may include at least one of the following: fan current, heating capacity, heat exchanger inlet pipe temperature, low-pressure saturation temperature, and heating operation time.

[0041] The fan current is the current when the outdoor fan 7 is running. The outdoor fan 7 is used to blow air to the outdoor heat exchanger 6 for evaporation and heat absorption. The fan current can be collected by the current acquisition device or the control board installed on the outdoor fan 7.

[0042] Heating capacity is used to determine the heating capacity of an air conditioner. Heating capacity can be obtained by calculating the heat released by the air conditioner. Based on the principle of air conditioners and the law of conservation of energy, we know that heat released = heat absorbed + work done by the compressor. The heat absorbed can be obtained based on the refrigerant flow rate and the enthalpy difference between the inlet and outlet pipes of the outdoor heat exchanger. The work done by the compressor can be collected by a power metering device electrically connected to the compressor.

[0043] The inlet temperature of the heat exchanger can be detected by a temperature sensor installed at the inlet of outdoor heat exchanger 6.

[0044] Low-pressure saturation temperature refers to the saturation temperature corresponding to the pressure on the low-pressure side of the air conditioner. The low-pressure side refers to the pipes and equipment into which the refrigerant flows during the heat absorption and evaporation stage of the air conditioner. For example, the low-pressure side may include the evaporator, expansion valve, and compressor suction port. The pressure on the low-pressure side of the air conditioner can be detected by pressure sensors installed in the corresponding equipment.

[0045] Heating operation time is used to determine the duration for which the air conditioner operates in heating mode.

[0046] The defrosting parameter thresholds may include the fan current threshold corresponding to the fan current, the heating capacity threshold corresponding to the heating capacity, the heat exchanger inlet pipe temperature threshold corresponding to the heat exchanger inlet pipe temperature, and the low-pressure saturation temperature threshold corresponding to the low-pressure saturation temperature.

[0047] In step S140, based on the smoothed second detection data, it is determined whether the defrosting conditions are met, including: The defrosting condition is determined to be met when the smoothed second detection data meets at least one of the following conditions: The fan current is greater than or equal to the fan current threshold, the heating capacity is less than or equal to the heating capacity threshold, the heat exchanger inlet pipe temperature is less than or equal to the inlet pipe temperature threshold, the low-pressure saturation temperature is less than or equal to the low-pressure saturation temperature threshold, and the heating operation time is greater than or equal to the heating operation time threshold.

[0048] When the smoothed second detection data meets one of the conditions, it is determined that the defrosting condition is met. For example, assuming the target defrosting parameter is the fan current, when the fan current is greater than or equal to the defrosting parameter threshold, it is determined that the defrosting condition is met.

[0049] Alternatively, if the smoothed second detection data meets two or more conditions, the defrosting condition is determined to be met. Assuming the target defrosting parameters are fan current and heating capacity, if the fan current is greater than or equal to the defrosting parameter threshold, and the heating capacity is less than or equal to the heating capacity threshold, the defrosting condition is determined to be met. The target defrosting parameters and defrosting conditions can be set or combined according to actual application requirements. When the defrosting condition is determined to be met, the air conditioner is controlled to defrost, preventing frost buildup on the outdoor unit from affecting the normal operation of the air conditioner.

[0050] In another embodiment, the target defrosting parameters include: fan current, heating capacity, heat exchanger inlet pipe temperature, low-pressure saturation temperature, and heating operation time. Based on the second detection data after smoothing, determine whether the defrosting conditions are met, including: If the comparison results of the second detection data of all target defrosting parameters and their corresponding defrosting parameter thresholds all meet the preset conditions, it is determined that the defrosting conditions are met; wherein, the defrosting parameter thresholds corresponding to different target defrosting parameters are different.

[0051] Specifically, the defrosting condition is determined to be met when the smoothed second detection data meets all of the following conditions: the fan current is greater than or equal to the fan current threshold, the heating capacity is less than or equal to the heating capacity threshold, the heat exchanger inlet pipe temperature is less than or equal to the inlet pipe temperature threshold, the low-pressure saturation temperature is less than or equal to the low-pressure saturation temperature threshold, and the heating operation time is greater than or equal to the heating operation time threshold.

[0052] In this embodiment, the defrosting condition is determined to be met only when the comparison results of the second detection data of all target defrosting parameters and the defrosting parameter threshold all meet the preset conditions, thereby controlling the air conditioner to defrost. Combining multi-dimensional parameters for defrosting judgment can avoid the problem of misjudging the defrosting of the air conditioner caused by the fluctuation of a single-dimensional parameter, and improve the accuracy of air conditioner defrosting.

[0053] In the above embodiments, the defrosting parameter threshold can be preset by the user.

[0054] In one embodiment, the defrost parameter threshold can be determined based on the actual operating conditions of the air conditioner or the target defrost parameter during air conditioner operation.

[0055] The heating operation time threshold can be the same as the target heating operation time, or the heating operation time threshold can be greater than the target heating operation time.

[0056] When the heating operation time of the air conditioner is less than the heating operation time threshold, there is no need to determine whether the air conditioner needs to defrost. The heating operation time threshold can be the minimum heating operation time of the air conditioner, which can ensure that the air conditioner has a minimum heating operation time and avoid misjudging the timing of defrosting.

[0057] like Figure 5 As shown, in one embodiment, the method further includes: S210: When the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, obtain the third detection data of the target defrosting parameter; The third detection data can be the real-time detection data of the target defrosting parameters. The third detection data can be the initial data detected when the air conditioner is operating in a frosting condition.

[0058] In an optional embodiment, the third detection data can be data on target defrosting parameters within a second target time period, wherein the second target time can be set as needed. In this embodiment, the second target time is 1 minute.

[0059] S220: Determine the defrosting parameter threshold based on the third detection data.

[0060] Optionally, the defrosting parameter threshold can be determined based on the third detection data. This can be done by directly using the third detection data as the defrosting parameter threshold. Alternatively, the defrosting parameter threshold can be determined based on the target multiple, mean, or target multiple of the mean of the third detection data.

[0061] The target multiple can be the preferred value determined by comprehensively considering the heating capacity of the air conditioner under different frost thicknesses in frosting conditions.

[0062] The following uses the heating capacity threshold as an example to illustrate the process of determining the defrost parameter threshold in this application embodiment: When the outdoor heat exchanger frosts over, its heating capacity gradually decreases. The initial heating capacity of the air conditioner is the highest when it is running. Therefore, the heating capacity threshold can be determined based on the initial heating capacity of the air conditioner and a preset attenuation coefficient. When the heating capacity drops to a certain level, the attenuation rate increases sharply. Therefore, in this embodiment, the attenuation coefficient is preferably 0.8, and the heating capacity threshold can be 0.8W0, where W0 is the initial heating capacity.

[0063] Preferably, the third detection data can also be the data detected after the air conditioner has run for the first target time. After the air conditioner has run for the first target time, it is in a stable operating state. At this time, the third detection data of the target defrosting parameters can be obtained. The obtained third detection data can better reflect the stable operation of the air conditioner. Based on the third detection data, the defrosting parameter threshold can be further determined, which can make the defrosting judgment more accurate.

[0064] In this embodiment, by recording the target defrosting parameters at the initial stage of air conditioner frost formation, a defrosting parameter threshold is determined based on the target defrosting parameters at the initial stage of air conditioner frost formation. The defrosting parameter threshold is more in line with the actual operating conditions of the air conditioner, thus making it more accurate to determine whether to defrost based on the defrosting parameter threshold.

[0065] like Figure 6 As shown, in one embodiment, the method further includes: S310: When the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, after the air conditioner has been running for a first target time, the fourth detection data of the target defrost parameter within a second target time is obtained. The first target time can be the stable operating time of the air conditioner. The first target time can be determined according to the operating status of the air conditioner. For example, in this embodiment, the first target time can be 3 minutes.

[0066] The fourth set of detection data consists of the detection data of the target defrosting parameters within the second target time period. The second target time can be determined based on actual operating conditions.

[0067] S320: Determine the defrosting parameter threshold based on the mean value of the fourth detection data.

[0068] Optionally, the defrosting parameter threshold can be determined by multiplying the mean of the fourth detection data with a preset coefficient. The coefficients for different defrosting parameters can be different or the same.

[0069] The following uses the fan current threshold as an example to illustrate the process of determining the defrosting parameter threshold in this application embodiment: After the air conditioner has been running stably for 3 minutes, the fan current is detected. The fan current detection data within 1 minute is obtained. The mean value I0 is calculated based on the fan current detection data. The fan current threshold is determined based on the target coefficient of the mean value I0. In this embodiment, the target coefficient is 1.2 and the fan current threshold is 1.2I0.

[0070] Compared to directly setting the fan current threshold, this embodiment of the application samples the fan current after a first target time of stable operation, and determines the fan current threshold based on the average value of the detection data during the second target time. This can reduce the impact of fan current changes caused by outdoor heat exchanger blockage, fan shaft wear, and poor return air flow. When making defrosting judgments based on the fan current threshold, defrosting can be performed more accurately.

[0071] After the air conditioner has been running for the first target time, it is in a stable operating state. At this time, the fourth detection data of the target defrosting parameters is obtained. The obtained fourth detection data can better reflect the stable operation of the air conditioner. The mean value is calculated based on the fourth detection data, and the defrosting parameter threshold is determined based on the mean value. This can avoid the defrosting parameter threshold being inconsistent with the actual operation due to data fluctuations, making the defrosting judgment more accurate.

[0072] In another embodiment, the defrosting parameter threshold can also be determined in conjunction with the ambient temperature.

[0073] Specifically, such as Figure 7 As shown, the method further includes: S410: Obtains outdoor ambient temperature; Outdoor ambient temperature can be obtained through temperature detection devices such as temperature sensors installed outdoors.

[0074] S420: Based on the preset temperature range information corresponding to the ambient temperature, determine the target temperature range corresponding to the outdoor ambient temperature; Temperature range information is used to determine the temperature range corresponding to the ambient temperature.

[0075] Temperature range information can include temperature thresholds for multiple temperature ranges. The number of temperature ranges and temperature thresholds can be set according to requirements.

[0076] In this embodiment of the application, the temperature range information includes a first temperature range, a second temperature range, a third temperature range, a first temperature threshold, and a second temperature threshold; wherein, the first temperature threshold is less than the second temperature threshold; Specifically, when the outdoor ambient temperature is less than or equal to the first temperature threshold, the target temperature range is determined as the first temperature range; otherwise, when the outdoor ambient temperature is less than or equal to the second temperature threshold, the target temperature range is determined as the second temperature range; otherwise, when the outdoor ambient temperature is greater than the second temperature threshold, the target temperature range is determined as the third temperature range.

[0077] In this embodiment, the first temperature threshold is -10 degrees Celsius, and the second temperature threshold is -5 degrees Celsius. In other embodiments, the first and second temperature thresholds can also be set according to the actual application.

[0078] S430: Based on the correspondence information between the preset temperature range and the first difference and the second difference, determine the first target difference and the second target difference corresponding to the target temperature range.

[0079] The threshold values ​​for the heat exchanger inlet pipe temperature and the low-pressure saturation temperature differ across different temperature ranges. The target air conditioner primarily employs a strategy of controlling the expansion valve opening based on superheat. As the frost layer thickness increases, the heat exchange between the refrigerant and the environment decreases. To achieve superheat, the expansion valve opening gradually decreases, leading to a downward trend in both the heat exchanger inlet pipe temperature and the low-pressure value. Therefore, when the outdoor ambient temperature is high, the threshold values ​​for the heat exchanger inlet pipe temperature and the low-pressure saturation temperature can be set to values ​​significantly different from the outdoor ambient temperature; conversely, when the outdoor ambient temperature is low, these threshold values ​​can be set to values ​​less different from the outdoor ambient temperature.

[0080] S440: Determine the heat exchanger inlet pipe temperature threshold based on the first target difference and the outdoor ambient temperature; determine the low-pressure saturation temperature threshold based on the second target difference and the outdoor ambient temperature.

[0081] For example, the heat exchanger inlet pipe temperature threshold can be TA, and the low-pressure saturation temperature threshold can be TB, where T is the outdoor ambient temperature, A is the first target difference, and B is the second target difference.

[0082] In this embodiment, when the target temperature range is the first temperature range, the corresponding heat exchanger inlet temperature threshold is T-3, and the low-pressure saturation temperature threshold is T-10; when the target temperature range is the second temperature range, the corresponding heat exchanger inlet temperature threshold is T-5, and the low-pressure saturation temperature threshold is T-15; when the target temperature range is the first temperature range, the corresponding heat exchanger inlet temperature threshold is T-8, and the low-pressure saturation temperature threshold is T-20. Wherein, T represents the outdoor ambient temperature.

[0083] In this embodiment, by determining the target temperature range corresponding to the outdoor ambient temperature, and based on the correspondence information between the preset temperature range and the heat exchanger inlet temperature threshold and the low-pressure saturation temperature threshold, the heat exchanger inlet temperature threshold and the low-pressure saturation temperature threshold corresponding to the target temperature range are determined, thereby adjusting the heat exchanger inlet temperature threshold and the low-pressure saturation temperature threshold according to the outdoor environment, and improving the accuracy of defrosting judgment.

[0084] The air conditioner defrosting method of this application embodiment obtains first detection data of the target defrosting parameters of the air conditioner during the target heating operation time when the air conditioner is in heating mode and the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold. After the target heating operation time, the second detection data is smoothed based on the first detection data to reduce abnormal values ​​caused by data fluctuations. Then, multiple target defrosting parameters such as fan current, heating capacity, heat exchanger inlet pipe temperature, and low-pressure saturation temperature are compared with the corresponding defrosting parameter thresholds to determine whether the defrosting conditions are met, thereby controlling the air conditioner to defrost. In this application embodiment, defrosting judgment is made from multiple dimensions such as heating operation time, fan current, heating capacity, heat exchanger inlet pipe temperature, and low-pressure saturation temperature, which can reduce the probability of misjudgment and achieve precise defrosting of the air conditioner.

[0085] like Figure 8 As shown in the figure, this application embodiment also provides an air conditioner defrosting device, including: The outdoor heat exchanger temperature acquisition module 110 is used to acquire the outdoor heat exchanger temperature when the air conditioner is in heating mode. The detection data acquisition module 120 is used to acquire the first detection data of the target defrosting parameters of the air conditioner during the target heating operation time if the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold. The detection data processing module 130 is used to acquire second detection data of the target defrosting parameters after the target heating operation time and to smooth the second detection data based on the first detection data. The defrosting condition determination module 140 is used to determine whether the defrosting conditions are met based on the smoothed second detection data. The defrosting module 150 is used to control the air conditioner to defrost when defrosting conditions are met.

[0086] In one embodiment, the detection data processing module 130 includes: The curve fitting unit is used to construct a fitting curve for the target defrosting parameters based on the first detection data; A smoothing unit is used to smooth the second detection data based on the fitting curve of the target defrosting parameters.

[0087] In one embodiment, the target defrosting parameters include: fan current, heating capacity, heat exchanger inlet pipe temperature, low-pressure saturation temperature, and heating operation time. The defrosting condition determination module 140 is used to determine that the defrosting condition is met when the smoothed second detection data meets at least one of the following conditions: The fan current is greater than or equal to the fan current threshold, the heating capacity is less than or equal to the heating capacity threshold, the heat exchanger inlet pipe temperature is less than or equal to the inlet pipe temperature threshold, the low-pressure saturation temperature is less than or equal to the low-pressure saturation temperature threshold, and the heating operation time is greater than or equal to the heating operation time threshold.

[0088] In one embodiment, the target defrosting parameters include: fan current, heating capacity, heat exchanger inlet pipe temperature, low-pressure saturation temperature, and heating operation time. The defrosting condition determination module 140 is used to determine that the defrosting condition is met when the smoothed second detection data meets all of the following conditions: The fan current is greater than or equal to the fan current threshold, the heating capacity is less than or equal to the heating capacity threshold, the heat exchanger inlet pipe temperature is less than or equal to the inlet pipe temperature threshold, the low-pressure saturation temperature is less than or equal to the low-pressure saturation temperature threshold, and the heating operation time is greater than or equal to the heating operation time threshold.

[0089] In one embodiment, the apparatus further includes: Outdoor ambient temperature acquisition module, used to acquire outdoor ambient temperature; The target temperature range determination module is used to determine the target temperature range corresponding to the outdoor ambient temperature based on the preset ambient temperature temperature range information. The target difference determination module is used to determine a first target difference and a second target difference corresponding to the target temperature range based on the correspondence information between the preset temperature range and the first difference and the second difference; wherein, the higher the temperature of the target temperature range, the larger the first target difference and the second target difference are; The first parameter threshold determination module is used to determine the heat exchanger inlet pipe temperature threshold based on the first target difference and the outdoor ambient temperature; and to determine the low-pressure saturation temperature threshold based on the second target difference and the outdoor ambient temperature.

[0090] In one embodiment, the apparatus further includes: The third detection data acquisition module is used to acquire the third detection data of the target defrosting parameters when the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold. The second parameter threshold determination module is used to determine the defrosting parameter threshold based on the third detection data.

[0091] In one embodiment, the apparatus further includes: The fourth detection data acquisition module is used to acquire the fourth detection data of the target defrosting parameters within the second target time after the air conditioner has been running for the first target time when the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold. The third parameter threshold determination module is used to determine the defrosting parameter threshold based on the mean of the fourth detection data.

[0092] It should be noted that the air conditioner defrosting device provided in the above embodiments is only illustrated by the division of the above functional modules when performing the air conditioner defrosting method. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the air conditioner defrosting device provided in the above embodiments and the air conditioner defrosting method in the above embodiments belong to the same concept, and its implementation process is detailed in the method embodiments, which will not be repeated here.

[0093] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the air conditioner defrosting method as described in any of the above embodiments.

[0094] The embodiments of this application may take the form of a computer program product implemented on one or more storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing program code. Computer-readable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information may be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to: phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0095] like Figure 9 As shown, this application embodiment also provides an air conditioner 200, including a memory 210, a processor 220, and a computer program stored in the memory 210 and executable by the processor 220; When the processor 220 executes the computer program, it implements the steps of the air conditioner defrosting method as described in any of the above.

[0096] The memory 210 includes read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0097] The processor 220 is the control unit of the air conditioner 200. It connects to various components of the air conditioner 200 via various interfaces and lines. By running or executing programs or modules stored in the memory 210, and by calling data stored in the memory 210, it performs various functions of the air conditioner 200 and processes data. For example, when the processor 220 executes the computer program stored in the memory 210, it implements all or part of the steps of the air conditioner defrosting method described in this embodiment; or it implements all or part of the functions of the air conditioner defrosting device. The processor 220 can be composed of integrated circuits, such as a single-packaged integrated circuit, or multiple integrated circuits with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips.

[0098] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0099] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A defrosting method for an air conditioner, characterized in that, include: When the air conditioner is in heating mode, obtain the outdoor heat exchanger temperature; If the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, the first detection data of the target defrost parameter of the air conditioner during the target heating operation time is obtained. After the target heating operation time, second detection data of the target defrosting parameters are acquired, and the second detection data is smoothed based on the first detection data; Based on the second detection data after smoothing, determine whether the defrosting conditions are met; When the defrosting conditions are met, the air conditioner is controlled to defrost.

2. The defrosting method for an air conditioner according to claim 1, characterized in that, Smoothing the second detection data based on the first detection data includes: Based on the first detection data, a fitting curve for the target defrosting parameters is constructed; The second detection data is smoothed based on the fitting curve of the target defrosting parameters.

3. The defrosting method for an air conditioner according to claim 1, characterized in that, The target defrosting parameters include: fan current, heating capacity, heat exchanger inlet pipe temperature, low-pressure saturation temperature, and heating operation time. Based on the second detection data after smoothing, determine whether the defrosting conditions are met, including: The defrosting condition is determined to be met when the smoothed second detection data meets at least one of the following conditions: The fan current is greater than or equal to the fan current threshold, the heating capacity is less than or equal to the heating capacity threshold, the heat exchanger inlet pipe temperature is less than or equal to the inlet pipe temperature threshold, the low-pressure saturation temperature is less than or equal to the low-pressure saturation temperature threshold, and the heating operation time is greater than or equal to the heating operation time threshold.

4. The defrosting method for an air conditioner according to claim 1, characterized in that, The target defrosting parameters include: fan current, heating capacity, heat exchanger inlet pipe temperature, low-pressure saturation temperature, and heating operation time. Based on the second detection data after smoothing, determine whether the defrosting conditions are met, including: The defrosting condition is determined to be met when the smoothed second detection data meets all of the following conditions: the fan current is greater than or equal to the fan current threshold, the heating capacity is less than or equal to the heating capacity threshold, the heat exchanger inlet pipe temperature is less than or equal to the inlet pipe temperature threshold, the low-pressure saturation temperature is less than or equal to the low-pressure saturation temperature threshold, and the heating operation time is greater than or equal to the heating operation time threshold.

5. The defrosting method for an air conditioner according to any one of claims 3-4, characterized in that, The method further includes: Obtain the outdoor ambient temperature; Based on the preset temperature range information corresponding to the ambient temperature, the target temperature range corresponding to the outdoor ambient temperature is determined. Based on the correspondence information between the preset temperature range and the first and second differences, a first target difference and a second target difference corresponding to the target temperature range are determined; wherein, the higher the temperature of the target temperature range, the larger the first target difference and the second target difference are; The heat exchanger inlet pipe temperature threshold is determined based on the first target difference and the outdoor ambient temperature; the low-pressure saturation temperature threshold is determined based on the second target difference and the outdoor ambient temperature.

6. The defrosting method for an air conditioner according to claim 1, characterized in that, The method further includes: When the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, the third detection data of the target defrosting parameter is obtained; Based on the third detection data, the defrosting parameter threshold is determined.

7. The defrosting method for an air conditioner according to claim 1, characterized in that, The method further includes: When the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold, after the air conditioner has been running for a first target time, the fourth detection data of the target defrosting parameters is obtained within a second target time. The defrosting parameter threshold is determined based on the mean value of the fourth detection data.

8. A defrosting device for an air conditioner, characterized in that, include: The outdoor heat exchanger temperature acquisition module is used to acquire the outdoor heat exchanger temperature when the air conditioner is in heating mode. The detection data acquisition module is used to acquire the first detection data of the target defrosting parameters of the air conditioner during the target heating operation time if the outdoor heat exchanger temperature is less than or equal to the outdoor heat exchanger temperature threshold. The detection data processing module is used to acquire second detection data of the target defrosting parameters after the target heating operation time and to smooth the second detection data based on the first detection data. The defrosting condition determination module is used to determine whether the defrosting conditions are met based on the smoothed second detection data. The defrosting module is used to control the air conditioner to defrost when defrosting conditions are met.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the air conditioner defrosting method as described in any one of claims 1-7.

10. An air conditioner, characterized in that: The device includes a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the processor executes the computer program to implement the steps of the air conditioner defrosting method as described in any one of claims 1-7.

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