Oil blockage fault detection method for air conditioner, oil blockage fault suppression method for air conditioner, and control apparatus, air conditioner and medium

Abstract

An oil blockage fault detection method for an air conditioner, an oil blockage fault suppression method for an air conditioner, and a control apparatus, an air conditioner and a medium. The oil blockage fault detection method comprises: in a defrosting mode, when the defrosting operation duration of an air conditioner reaches an abnormal defrosting duration, acquiring the defrosting operation current and defrosting exhaust temperature of the air conditioner in the defrosting mode, wherein the defrosting operation duration is a duration within which the air conditioner operates in a situation where the defrosting operation frequency of the air conditioner reaches a first preset frequency (S100); on the basis of the defrosting operation current and the defrosting exhaust temperature, determining whether the air conditioner is in a defrosting fault state (S200); when the air conditioner is in a defrosting fault state, controlling the air conditioner to switch to a heating mode, and acquiring a heating operation current and a heating operation frequency of the air conditioner in the heating mode (S300); and on the basis of the heating operation current and the heating operation frequency, determining whether the air conditioner has an oil blockage fault (S400).

Description

Air conditioner oil blockage fault detection and suppression method, control device, air conditioner and medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311610647.1 filed on November 28, 2023, entitled “Oil blockage fault detection method, control device, air conditioner and medium for air conditioner”, and No. 202311611127.2 filed on November 28, 2023, entitled “Control method, control device, air conditioner and medium for air conditioner”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of air conditioning, and in particular to a method for detecting oil blockage faults of an air conditioner, a control device, an air conditioner, and a medium. Background Art

[0004] Air conditioners using R290 environmentally friendly refrigerant usually use large-displacement compressors to increase the cooling capacity due to the low cooling capacity per unit volume of R290 refrigerant. At the same time, due to its flammability, the charging amount is extremely low. During drastic changes in operating conditions, the refrigerant / lubricant oil mixture is prone to stratified flow. Based on the above characteristics of the R290 refrigerant air conditioner system, during the heating-defrosting conversion process of the air conditioner in low-temperature heating conditions, the refrigerant / lubricant oil mixture is prone to a sudden pressure drop when passing through the throttling element, resulting in changes in the solubility and viscosity of the lubricant oil. In severe cases, the throttling element is blocked, resulting in oil blockage, affecting the normal operating performance of the air conditioner.

[0005] Summary of the Invention

[0006] The purpose of the present application is to at least partially solve one of the technical problems existing in the prior art, and to this end provide an air conditioner oil blockage fault detection and suppression method, a control device, an air conditioner and a medium.

[0007] In a first aspect, an embodiment of the present application provides a method for detecting an oil blockage fault in an air conditioner, comprising:

[0008] In the defrost mode, when the defrost operation time of the air conditioner reaches the defrost abnormality time, obtaining the defrost operation current and the defrost exhaust temperature of the air conditioner in the defrost mode; the defrost operation time is the operation time during which the defrost operation frequency of the air conditioner reaches a first preset frequency;

[0009] determining whether the air conditioner is in a defrost fault state according to the defrost operation current and the defrost exhaust temperature;

[0010] When the air conditioner is in a defrost failure state, controlling the air conditioner to switch to a heating mode, and obtaining a heating operating current and a heating operating frequency of the air conditioner in the heating mode; and

[0011] It is determined whether an oil blockage fault occurs in the air conditioner according to the heating operation current and the heating operation frequency.

[0012] According to some embodiments of the present application, a method for detecting an oil blockage fault in an air conditioner is provided, wherein determining whether an oil blockage fault occurs in the air conditioner based on the heating operation current and the heating operation frequency includes:

[0013] Obtaining a heating current detection result based on the heating operation current and a preset heating current threshold, and obtaining a heating frequency detection result based on the heating operation frequency and a preset heating frequency threshold;

[0014] It is determined whether an oil blockage fault occurs in the air conditioner according to the heating current detection result and the heating frequency detection result.

[0015] According to some embodiments of the present application, the method for detecting an oil blockage fault in an air conditioner provided herein includes determining whether an oil blockage fault occurs in the air conditioner based on the heating current detection result and the heating frequency detection result, including:

[0016] When the heating current detection result meets a preset heating current abnormality condition, and the heating frequency detection result meets a preset heating frequency abnormality condition, it is determined that an oil blockage fault occurs in the air conditioner.

[0017] According to some embodiments of the present application, the method for detecting an oil blockage fault in an air conditioner provided herein includes determining whether an oil blockage fault occurs in the air conditioner based on the heating current detection result and the heating frequency detection result, including:

[0018] When the heating current detection result does not meet the preset heating current abnormal condition, or the heating frequency detection result does not meet the preset heating frequency abnormal condition, the condenser outlet temperature of the air conditioner is obtained, and based on the condenser outlet temperature and the preset condensing temperature threshold, it is determined whether the air conditioner has an oil blockage fault.

[0019] According to some embodiments of the present application, a method for detecting an oil blockage fault in an air conditioner is provided, wherein determining whether an oil blockage fault occurs in the air conditioner based on the condenser outlet temperature and a preset condensing temperature threshold value includes:

[0020] When the condenser outlet temperature is lower than a preset condensing temperature threshold, it is determined that an oil blockage fault occurs in the air conditioner.

[0021] According to the oil blockage fault detection method for an air conditioner provided in some embodiments of the present application, the abnormal heating current condition is that the heating operating current is greater than or equal to a preset heating current threshold; the abnormal heating frequency condition is that the heating operating frequency is less than a preset heating frequency threshold.

[0022] According to some embodiments of the present application, the method for detecting an oil blockage fault in an air conditioner provides determining whether the air conditioner is in a defrost fault state based on the defrost operating current and the defrost exhaust temperature, including:

[0023] Whether the air conditioner is in a fault state is determined according to a current variation trend of the defrost operation current and a temperature variation trend of the defrost exhaust temperature.

[0024] According to the oil blockage fault detection method for an air conditioner provided in some embodiments of the present application, determining whether the air conditioner is in a fault state based on the current change trend of the defrost operation current and the temperature change trend of the defrost exhaust temperature includes:

[0025] When the current variation trend of the defrost operation current meets the preset defrost current abnormality condition, and the temperature variation trend of the defrost exhaust temperature meets the preset defrost exhaust abnormality condition, it is determined that the air conditioner is in a fault state.

[0026] According to the oil blockage fault detection method for the air conditioner provided in some embodiments of the present application, the abnormal defrost current condition is that the defrost operating current is less than a preset defrost current threshold, and the defrost operating current is less than the defrost operating current at the previous moment; the abnormal defrost exhaust condition is that the defrost exhaust temperature is higher than the defrost exhaust temperature at the previous moment.

[0027] In a second aspect, an embodiment of the present application provides a method for suppressing an oil blockage fault of an air conditioner, comprising:

[0028] When the air conditioner is switched from a heating mode to a defrosting mode, obtaining the operating frequency and operating time of the air conditioner in the heating mode; and

[0029] The opening degree of the electronic expansion valve of the air conditioner in the defrost mode is controlled according to the operating frequency and the operating time.

[0030] According to some embodiments of the present application, a method for suppressing an oil blockage fault of an air conditioner is provided, wherein the controlling the opening of the electronic expansion valve of the air conditioner in a defrost mode according to the operating frequency and the operating duration includes:

[0031] determining an oil blockage detection result according to the operating frequency and the operating time, wherein the oil blockage detection result is used to indicate a possibility that an oil blockage fault occurs in the air conditioner; and

[0032] According to the oil blockage detection result, the opening degree of the electronic expansion valve of the air conditioner in the defrost mode is controlled.

[0033] According to some embodiments of the present application, a method for suppressing an oil blockage fault in an air conditioner is provided, wherein the method controls the opening of an electronic expansion valve of the air conditioner in a defrost mode according to the oil blockage detection result, including:

[0034] When the oil blockage detection result meets the oil blockage risk condition, controlling the opening of the electronic expansion valve of the air conditioner in the defrost mode to be the maximum opening;

[0035] or,

[0036] When the oil blockage detection result does not meet the oil blockage risk condition, the opening of the electronic expansion valve of the air conditioner in the defrost mode is controlled according to the operating frequency and the operating time.

[0037] According to the oil blockage fault suppression method for an air conditioner provided in some embodiments of the present application, the oil blockage risk condition is that the operating frequency is less than or equal to a first preset frequency threshold, or the operating duration is greater than or equal to a first preset duration threshold, or the operating frequency is less than or equal to the first preset frequency threshold and the operating duration is greater than or equal to the first preset duration threshold.

[0038] According to some embodiments of the present application, a method for suppressing an oil blockage fault of an air conditioner is provided, wherein the controlling the opening of the electronic expansion valve of the air conditioner in a defrost mode according to the operating frequency and the operating duration includes:

[0039] determining a target opening according to the operating duration and a frequency difference between the operating frequency and a second preset frequency threshold; and

[0040] The opening degree of the electronic expansion valve of the air conditioner in the defrost mode is controlled to be a target opening degree.

[0041] According to some embodiments of the present application, the method for suppressing oil blockage in an air conditioner includes determining the target opening degree based on the operating time and a second frequency difference between the operating frequency and a second preset frequency threshold, including:

[0042] Obtaining an opening adjustment parameter, multiplying the inverse of the operating time, the opening adjustment parameter, and a frequency difference between the operating frequency and a second preset frequency threshold to obtain an adjustment amplitude; and

[0043] The target opening is obtained by subtracting the adjustment amplitude from the maximum opening of the electronic expansion valve of the air conditioner.

[0044] According to some embodiments of the present application, the method for suppressing an oil blockage fault of an air conditioner provided herein includes controlling the opening of the electronic expansion valve of the air conditioner in a defrost mode to a target opening, including:

[0045] Obtaining an opening adjustment duration according to a frequency difference between the operating frequency and the second preset frequency threshold, and / or a time difference between the operating duration and the second preset duration threshold; and

[0046] According to the oil blockage fault suppression method for the air conditioner provided in some embodiments of the present application, the operating time is the cumulative operating time of the air conditioner running at an operating frequency lower than a preset frequency threshold in the heating mode.

[0047] According to the method for suppressing oil blockage fault of an air conditioner provided in some embodiments of the present application, the operating frequency is the operating frequency of the air conditioner within a time period before ending the heating mode.

[0048] In the third aspect, an embodiment of the present application provides an operation control device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the oil blockage fault detection method for the air conditioner as described in the first and second aspects of the embodiments above.

[0049] In a fourth aspect, an embodiment of the present application provides an air conditioner, comprising the operation control device described in the embodiment of the third aspect.

[0050] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the communication detection method described in the first and second aspects of the embodiments above.

[0051] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be achieved and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0053] The present application is further described below with reference to the accompanying drawings and embodiments;

[0054] FIG1 is a schematic structural diagram of an air conditioner provided by one embodiment of the present application;

[0055] FIG2 is a flow chart of a method for detecting oil blockage in an air conditioner according to an embodiment of the present application;

[0056] FIG3 is a diagram showing the specific steps of step S400 shown in FIG2 ;

[0057] FIG4 is a diagram showing the specific steps of step S420 shown in FIG3 ;

[0058] FIG5 is a diagram showing the specific steps of another embodiment of step S420 shown in FIG3 ;

[0059] FIG6 is a diagram showing the specific steps of step S200 shown in FIG1 ;

[0060] FIG7 is a diagram showing the specific steps of step S210 shown in FIG6 ;

[0061] FIG8 is a flow chart of a method for suppressing oil blockage fault of an air conditioner provided in an embodiment of the present application;

[0062] FIG9 is a diagram showing the specific steps of step S600 shown in FIG8 ;

[0063] FIG10 is a diagram showing the specific steps of step S620 shown in FIG9 ;

[0064] FIG11 is a diagram showing the specific steps of another embodiment of step S620 shown in FIG9 ;

[0065] FIG12 is a diagram showing the specific steps of step S630 shown in FIG11 ;

[0066] FIG13 is a diagram showing the specific steps of step S640 shown in FIG11; and

[0067] FIG14 is a schematic structural diagram of an operation control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0068] This section will describe the specific embodiments of the present application in detail. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0069] In the description of this application, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0070] It should be noted that the terms "dispose," "install," and "connect" in the embodiments of this application should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the embodiments of this application based on the specific content of the technical solution. For example, the term "connect" can refer to mechanical connection, electrical connection, or communication; it can refer to direct connection or indirect connection through an intermediary.

[0071] It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0072] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0073] Currently, related technologies use refrigerants with low cooling capacity per unit volume as the refrigerant for air conditioners, and then employ large-displacement compressors to increase cooling capacity. However, due to the flammability of refrigerants, the refrigerant charge is extremely low. During the transition from heating to defrosting in low-temperature air conditioners, the refrigerant / lubricant mixture is prone to a sudden pressure drop as it passes through the throttling element, causing changes in the lubricant's solubility and viscosity. In severe cases, this can clog the throttling element, causing oil blockage and affecting the air conditioner's normal operation.

[0074] The current air conditioner fault detection method can only detect insufficient air conditioner performance to determine that the air conditioner has an abnormal fault, and cannot accurately identify the difference between oil blockage and refrigerant leakage. Usually, any one fault such as refrigerant leakage or oil blockage is used to replace the specific fault cause, resulting in the inability to quickly identify the true cause of the air conditioner fault and it is difficult to take appropriate measures to remedy the problem in a timely manner.

[0075] Based on this, embodiments of the present application provide an air conditioner oil blockage fault detection method, control device, air conditioner, and medium. When the defrost operation duration reaches the defrost abnormality duration, it can be considered that the air conditioner has experienced performance abnormalities in the defrost mode. Therefore, the defrost operation current and defrost exhaust temperature of the air conditioner in the defrost mode can be used to perform a preliminary fault diagnosis on the refrigerant circulation. Because the air conditioner exhibits different operating conditions when switching from defrost mode to heating mode when experiencing an oil blockage fault and a refrigerant leakage fault, the heating operation current and heating operation frequency of the air conditioner in the heating mode differ under different fault conditions. Therefore, when it is determined that the air conditioner has experienced a refrigerant blockage fault, i.e., the air conditioner is in a defrost fault state, the heating operation current and heating operation frequency of the air conditioner in the heating mode can be used to further determine whether an oil blockage fault has occurred. Therefore, by analyzing and determining the fault condition of the air conditioner based on the combined operating data of the air conditioner in the defrost mode and the operating data in the heating mode, it is possible to accurately determine whether the air conditioner has experienced an oil blockage fault.

[0076] The following further describes the embodiments of the first aspect of the present application in conjunction with Figures 1-7.

[0077] Referring to Figure 1, Figure 1 is a schematic diagram of the structure of an air conditioner provided by one embodiment of the present application. It will be understood that the air conditioner includes a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 400, and a throttling element 300. The outdoor heat exchanger 400 is connected to a first end of the compressor 100 and a first end of the throttling element 300 via pipes, respectively. The indoor heat exchanger 200 is connected to a second end of the compressor 100 and a second end of the throttling element 300 via pipes, respectively. A refrigerant mixture of refrigerant and lubricating oil flows within the pipes. When the air conditioner is operating in heating mode, a high-temperature, high-pressure refrigerant mixture is transported from the compressor 100 to the indoor heat exchanger 200 for heat exchange. The heat-exchanged refrigerant mixture passes through the throttling element 300 and is then transported to the outdoor heat exchanger 400. Finally, it is transported from the outdoor heat exchanger 400 back to the compressor 100. At this point, the indoor heat exchanger 200 acts as a condenser, liquefying the refrigerant flowing through the indoor heat exchanger 200 and releasing heat. When the air conditioner operates in heating mode for a long time, frost may form on the outdoor heat exchanger 400. If the outdoor heat exchanger 400 is not defrosted in time, the heat exchange efficiency of the air conditioner may decrease. Therefore, after operating in heating mode for a period of time, the air conditioner needs to operate in defrost mode to defrost the outdoor heat exchanger 400. When the air conditioner operates in defrost mode, a high-temperature and high-pressure refrigerant mixture is transported from the compressor 100 to the outdoor heat exchanger 400 for heat exchange. The heat-exchanged refrigerant mixture passes through the throttling element 300 and is then transported to the indoor heat exchanger 200. Finally, it is transported from the indoor heat exchanger 200 back to the compressor 100. At this time, the outdoor heat exchanger 400 performs a condensing function, liquefying the refrigerant flowing through the indoor heat exchanger 200 and releasing heat. When the air conditioner experiences a refrigerant leak, oil blockage, or other fault, the amount of refrigerant flowing through the indoor heat exchanger 200 or the outdoor heat exchanger 400 per unit time decreases, reducing the air conditioner's heat exchange efficiency. This also causes the air conditioner's defrost operating current to change, reducing defrost performance and prolonging defrost time. Furthermore, faults such as oil blockage and refrigerant leakage can also alter the load pressure of the compressor 100, causing changes in the compressor 100's exhaust temperature, which in turn affects the air conditioner's performance. Therefore, an exhaust temperature sensor is provided within the compressor 100 to detect the compressor 100's exhaust temperature. This temperature can be used to determine if the air conditioner has experienced a fault. Because the compressor 100's exhaust temperature and defrost operating current vary in different fault conditions, the defrost operating current and compressor 100's exhaust temperature in defrost mode can be used to make a preliminary fault diagnosis of the refrigerant circulation. The compressor 100's exhaust temperature represents the defrost exhaust temperature of the air conditioner in defrost mode.Since the air conditioner has oil blockage faults and refrigerant leakage faults, the operating conditions exhibited during the switch from defrost mode to heating mode are different, resulting in differences in the heating operating current and heating operating frequency of the air conditioner in the heating mode under different fault conditions. Therefore, the faults of the air conditioner can be analyzed and judged by comprehensively analyzing the operating data of the air conditioner in the defrost mode and the operating data of the air conditioner in the heating mode, and it can be accurately judged whether an oil blockage fault has occurred in the pipes and throttling element 300 of the air conditioner.

[0078] It should be noted that when an air conditioner uses R290 refrigerant as a refrigerant, the amount of R290 refrigerant charged into the air conditioner is relatively small due to its flammability. If the operating conditions of the air conditioner change drastically, lubricating oil may precipitate from the R290 refrigerant and subsequently clog the ends of the throttling element 300, causing an oil blockage in the air conditioner.

[0079] Referring to FIG. 2 , FIG. 2 is a flow chart of a method for detecting an oil blockage fault in an air conditioner according to an embodiment of the present application. The flow chart of the method for detecting an oil blockage fault in an air conditioner can be applied to the air conditioner shown in FIG. 1 . The flow chart of the method for detecting an oil blockage fault in an air conditioner includes but is not limited to the following steps:

[0080] Step S100, in the defrost mode, when the defrost operation time of the air conditioner reaches the defrost abnormality time, obtaining the defrost operation current and defrost exhaust temperature of the air conditioner in the defrost mode;

[0081] Step S200, determining whether the air conditioner is in a defrost fault state according to the defrost operation current and the defrost exhaust temperature;

[0082] Step S300: When the air conditioner is in a defrost fault state, the air conditioner is controlled to switch to a heating mode, and a heating operating current and a heating operating frequency of the air conditioner in the heating mode are obtained;

[0083] Step S400: determining whether an oil blockage fault occurs in the air conditioner based on the heating operation current and the heating operation frequency.

[0084] It is understandable that when an air conditioner experiences performance abnormalities, its operating conditions in defrost mode vary. Consequently, the defrost operating current and defrost exhaust temperature vary under different fault conditions. Therefore, the defrost operating current and defrost exhaust temperature can be used to make a preliminary assessment of the air conditioner's fault condition. For example, when an air conditioner experiences performance abnormalities due to a refrigerant anomaly, the defrost operating current in defrost mode will decrease, while the defrost exhaust temperature will increase.

[0085] It should be noted that refrigerant anomalies can be divided into oil blockage and refrigerant leakage. Since the operating conditions of the air conditioner during the switch from defrost mode to heating mode are different when oil blockage and refrigerant leakage occur, the heating operating current and heating operating frequency of the air conditioner in heating mode differ under different fault conditions. Therefore, if a refrigerant circulation fault is determined in the air conditioner, the heating operating current and heating operating frequency can be used to further determine whether an oil blockage fault has occurred. Compared to the related art, which only determines an air conditioner abnormality based on insufficient air conditioner performance, it is impossible to accurately analyze the type of fault that has occurred in the air conditioner, that is, it is impossible to determine whether the air conditioner has an oil blockage fault. However, the present application analyzes and determines the fault of the air conditioner by comprehensively analyzing the operating data of the air conditioner in defrost mode and in heating mode, and can accurately determine whether the air conditioner has an oil blockage fault.

[0086] It should be noted that the defrost operation duration is the duration during which the air conditioner's defrost operation frequency reaches a first preset frequency. The defrost operation frequency is the operating frequency of the compressor 100 of the air conditioner in the current defrost mode. The first preset frequency is the operating frequency of the compressor 100 under normal conditions. A malfunction in the air conditioner will result in an extension of the operation duration at the first preset frequency. Specifically, if the defrost operation frequency is equal to the first preset frequency in the defrost mode, but the defrost operation duration is greater than the defrost abnormality duration, the air conditioner may be considered to have experienced a malfunction. Furthermore, if the defrost operation frequency is less than the first preset frequency in the defrost mode, the air conditioner may also be considered to have experienced a malfunction.

[0087] It should be noted that the heating operating current and heating operating frequency can be obtained after a period of time after the defrost mode is switched to the heating mode, so as to avoid fluctuations in the heating operating current and heating operating frequency caused by the air conditioner mode switching, which may lead to misjudgment.

[0088] It should be noted that the defrost power can be calculated by the defrost operating current and the input voltage of the air conditioner. When the input voltage of the air conditioner is constant, the defrost operating current will change with the change of the defrost power. Therefore, the defrost power of the air conditioner can be judged by obtaining the defrost operating current. If the defrost operating power of the air conditioner is insufficient, it can be considered that the performance of the air conditioner is insufficient. In the defrost mode, when the refrigerant circulation of the air conditioner is abnormal, the refrigerant in the outdoor heat exchanger 400 cannot dissipate heat normally, which will increase the load of the compressor 100, thereby causing the exhaust temperature of the compressor 100 to change, that is, the defrost exhaust temperature changes. Similarly, the heating power can be calculated by the heating operating current and the input voltage of the air conditioner. When the input voltage of the air conditioner is constant, the heating operating current will change with the change of the heating power. Therefore, the heating power of the air conditioner can be judged by obtaining the heating operating current. If the air conditioner's performance is insufficient due to oil blockage, when the air conditioner switches from defrost mode to heating mode, the refrigerant temperature at the throttling element 300 and within the pipes increases, causing the viscosity of the lubricating oil to decrease, allowing the lubricating oil to remix with the refrigerant. The oil blockage will then disappear, and the heating operating current and frequency will return to normal. If the air conditioner's performance is insufficient due to refrigerant leakage, when the air conditioner switches from defrost mode to heating mode, the amount of refrigerant passing through the indoor heat exchanger 200 will decrease, causing the heating operating current and frequency to change.

[0089] Referring to FIG. 3 , FIG. 3 is a diagram illustrating specific steps of step S400 shown in FIG. 2 , including but not limited to the following steps:

[0090] Step S410, obtaining a heating current detection result based on the heating operation current and a preset heating current threshold, and obtaining a heating frequency detection result based on the heating operation frequency and a preset heating frequency threshold;

[0091] Step S420: Determine whether the air conditioner has an oil blockage fault based on the heating current detection result and the heating frequency detection result.

[0092] It is understood that when the air conditioner fault is a refrigerant circulation failure, the air conditioner is switched from defrost mode to heating mode, and then the heating operating current and heating operating frequency of the air conditioner in heating mode are obtained. A heating current detection result is obtained by comparing the heating operating current with a preset heating current threshold, and a heating operating frequency detection result is obtained by comparing the heating operating frequency with a preset heating frequency threshold. The heating current detection results and the heating operating frequency detection results are then combined to determine whether the air conditioner has an oil blockage fault.

[0093] It is understandable that the preset heating current threshold can be the heating operating current of the air conditioner under normal circumstances, and the preset heating frequency threshold can be the heating operating frequency threshold of the air conditioner under normal circumstances. When an oil blockage fault occurs in the air conditioner, after the air conditioner switches from defrost mode to heating mode, the heating operating current will return to normal. Therefore, it is possible to determine whether the air conditioner has an oil blockage fault by comparing the heating operating current with the preset heating current threshold, and the comparison result of the heating operating current with the preset heating current threshold is the heating current detection result. For example, if the comparison result of the heating operating current with the preset heating current threshold is that the heating operating current is greater than the preset heating current threshold, the heating current detection result is that the air conditioner has an oil blockage fault; when the comparison result of the heating operating current with the preset heating current threshold is that the heating operating current is less than the preset heating current threshold, the heating current detection result is that the air conditioner has not suffered an oil blockage fault. When an air conditioner experiences an oil blockage, the heating frequency returns to normal after switching from defrost mode to heating mode. Therefore, the heating frequency can be compared with a preset heating current threshold to determine whether the air conditioner has experienced an oil blockage. The comparison of the heating current with the preset heating current threshold serves as the heating current detection result. For example, if the comparison of the heating frequency with the preset heating frequency threshold shows that the heating frequency is greater than the preset heating frequency threshold, the heating frequency detection result indicates that the air conditioner has experienced an oil blockage. If the comparison of the heating frequency with the preset heating frequency threshold shows that the heating frequency is less than the preset heating frequency threshold, the heating frequency detection result indicates that the air conditioner has not experienced an oil blockage.

[0094] It should be noted that during the operation of the air conditioner, the heating operating current and heating operating frequency may fluctuate. Therefore, the heating current detection result can be determined by calculating the current ratio of the heating operating current to a preset heating current threshold, and then comparing the calculated current ratio with the preset current ratio. By calculating the current ratio and frequency ratio, the interference caused by fluctuations in the operating parameters of the air conditioner during operation can be reduced, thereby improving the accuracy of the detection result. For example, if the current ratio of the heating operating current to the preset heating current threshold is greater than the preset current ratio, the heating current detection result indicates that the air conditioner has an oil blockage fault; if the current ratio of the heating operating current to the preset heating current threshold is less than the preset current ratio, the heating current detection result indicates that the air conditioner has not experienced an oil blockage fault. Similarly, the heating current detection result can be determined by calculating the frequency ratio of the heating operating frequency to a preset heating frequency threshold, and then comparing the calculated frequency ratio with the preset frequency ratio. For example, if the frequency ratio of the heating operating frequency to the preset heating frequency threshold is greater than the preset frequency ratio, the heating frequency detection result indicates that the air conditioner has an oil blockage fault; if the frequency ratio of the heating operating frequency to the preset heating frequency threshold is less than the preset frequency ratio, the heating frequency detection result indicates that the air conditioner has not experienced an oil blockage fault. If both the heating frequency detection result and the heating current detection result indicate that the air conditioner has an oil blockage fault, it can be assumed that the air conditioner has an oil blockage fault.

[0095] It is understandable that the heating operating current and heating operating frequency at different moments can be obtained for comparison, and the heating current detection result can be determined based on the comparison result between the heating operating current and the preset heating current threshold, and the heating frequency detection result can be determined based on the comparison result between the heating operating frequency and the preset heating operating frequency. The preset heating current threshold can be the heating operating current at the previous moment, and the preset heating frequency threshold can be the heating operating frequency threshold at the previous moment, that is, the heating operating current and heating operating frequency at two time nodes before and after the heating mode are obtained. When the comparison result between the heating operating current and the preset heating current threshold is that the heating operating current is greater than the preset heating current threshold, the heating current detection result is that the air conditioner has an oil blockage fault; when the comparison result between the heating operating current and the preset heating current threshold is that the heating operating current is less than the preset heating current threshold, the heating current detection result is that the air conditioner has not suffered an oil blockage fault. If the comparison result of the heating operating frequency with the preset heating frequency threshold shows that the heating operating frequency is greater than the preset heating frequency threshold, the heating frequency detection result indicates that the air conditioner has an oil blockage fault. If the comparison result of the heating operating frequency with the preset heating frequency threshold shows that the heating operating frequency is less than the preset heating frequency threshold, the heating frequency detection result indicates that the air conditioner has not experienced an oil blockage fault. If the heating frequency detection result and the heating current detection result both indicate an oil blockage fault, it can be considered that the air conditioner has an oil blockage fault.

[0096] Referring to FIG. 4 , FIG. 4 is a diagram showing specific steps of step S420 shown in FIG. 3 , including but not limited to the following steps:

[0097] In step S421 , when the heating current detection result satisfies a preset abnormal heating current condition and the heating frequency detection result satisfies a preset abnormal heating frequency condition, it is determined that an oil blockage fault occurs in the air conditioner.

[0098] It can be understood that the fault of the air conditioner is a refrigerant circulation failure. When the heating current detection result meets the preset heating current abnormal condition and the heating frequency detection result meets the preset heating frequency abnormal condition, the air conditioner confirms that an oil blockage fault has occurred and issues an alarm.

[0099] It should be noted that when the air conditioner has an oil blockage fault and switches from the defrost mode to the heating mode, the lubricating oil blocked at the throttling element 300 may dissolve into the refrigerant as the temperature rises, thereby restoring the heating performance of the air conditioner to normal. When the heating performance of the air conditioner returns to normal, the heating operating current and the heating operating frequency will also return to normal. Therefore, the abnormal heating current condition can be that the heating operating current is greater than or equal to the preset heating current threshold, and the abnormal heating frequency condition is that the heating operating frequency is greater than the preset heating frequency threshold. Although the lubricating oil blocked at the throttling element 300 is re-mixed with the refrigerant after the air conditioner switches from the defrost mode to the heating mode, the lubricating oil and the refrigerant may not be fully mixed, and oil blockage faults may frequently occur in subsequent working processes. Therefore, even if the operation of the air conditioner has returned to normal, an alarm prompt is still required to remind the user.

[0100] It should be noted that when an air conditioner experiences an oil blockage fault and switches from defrost mode to heating mode, the lubricating oil clogged in the throttling element 300 dissolves into the refrigerant as the temperature rises. However, the lubricating oil is not completely dissolved into the refrigerant, meaning that lubricating oil is still attached to the air conditioner's pipes and throttling element 300. This does not affect the normal operation of the air conditioner. However, due to the lubricating oil still attached to the pipes and throttling element 300, the air conditioner's heating operating current does not reach the preset heating current threshold, and the heating operating frequency does not reach the preset heating operating frequency. Therefore, the abnormal heating current condition can be that the ratio of the heating operating current to the preset heating current threshold is greater than the preset current ratio, and the abnormal heating frequency condition is that the ratio of the heating operating frequency to the preset heating frequency threshold is greater than the preset frequency ratio. This is equivalent to the existence of a current fluctuation parameter associated with the preset heating current threshold. A current threshold range is obtained by calculating the preset heating current threshold and the current fluctuation parameter. When the heating operating current falls within the current threshold range, it can be considered that the heating operating current meets the abnormal heating current condition. Similarly, there is a frequency fluctuation parameter related to the preset heating frequency threshold. By calculating the preset heating frequency threshold and the frequency fluctuation parameter, the frequency threshold range can be determined. When the heating operating frequency falls within the frequency threshold range, it can be considered that the heating operating frequency meets the heating frequency abnormality condition.

[0101] It should be noted that lubricating oil does not dissolve evenly in the refrigerant, which may cause fluctuations in the heating operating current and heating operating frequency during the lubricating oil dissolution process. However, the changing trends of the heating operating current and the heating operating frequency are both upward. Therefore, an abnormal heating current condition can be that the current changing trend in the previous unit time is smaller than the current changing trend in the next unit time, and an abnormal heating frequency condition can be that the heating operating frequency detection result shows that the frequency changing trend in the previous unit time is smaller than the frequency changing trend in the next unit time. That is, although the heating operating current fluctuates continuously, the heating operating current is always on an upward trend, and although the heating operating frequency fluctuates continuously, the heating operating frequency is always on an upward trend.

[0102] 5 , which is a diagram illustrating specific steps of another embodiment of step S420 shown in FIG. 3 , including but not limited to the following steps:

[0103] In step S422, when the heating current detection result does not meet the preset heating current abnormal condition, or the heating frequency detection result does not meet the preset heating frequency abnormal condition, the condenser outlet temperature of the air conditioner is obtained, and based on the condenser outlet temperature and the preset condensing temperature threshold, it is determined whether the air conditioner has an oil blockage fault.

[0104] It is understood that when switching from heating mode to defrost mode, the viscosity of the lubricating oil at both ends of the throttle element 300 decreases due to changes in pressure and temperature, leading to blockage at both ends of the throttle element 300. Furthermore, after switching from defrost mode to heating mode, the lubricating oil blocked at the throttle element 300 does not dissolve into the refrigerant as the temperature rises, causing the refrigerant flow rate within the pipeline to decrease, thereby resulting in insufficient heating power for the air conditioner. When the air conditioner's heating power is insufficient, the heating current detection result will not meet the preset abnormal heating current condition, or the heating frequency detection result will not meet the preset abnormal heating frequency condition. When the refrigerant flow rate within the pipeline decreases, the refrigerant cannot fully dissipate heat in the indoor heat exchanger 200, causing the outlet temperature of the indoor heat exchanger 200 to drop, namely, the condenser outlet temperature to drop. Therefore, whether the throttle element 300 of the air conditioner is oil-blocked can be determined based on the condenser outlet temperature and the preset condensing temperature threshold.

[0105] It should be noted that the preset condensing temperature threshold can be the condenser outlet temperature in normal heating mode. By determining whether the outlet temperature is greater than the preset condensing temperature threshold, an oil blockage fault in the air conditioner is determined. When the condenser outlet temperature is less than the preset condensing temperature threshold, an oil blockage fault is determined. When the outlet temperature is greater than the preset condensing temperature threshold, the air conditioner will also perform a self-test to confirm the fault.

[0106] It should be noted that the condenser outlet temperature can be obtained after a period of time has passed since the defrost mode was switched to the heating mode, so as to avoid condenser outlet temperature fluctuations caused by the air conditioner mode switching, which may lead to misjudgment.

[0107] 6 , which is a diagram illustrating specific steps of step S200 shown in FIG1 , including but not limited to the following steps:

[0108] Step S210: determining whether the air conditioner is in a fault state based on the current variation trend of the defrost operation current and the temperature variation trend of the defrost exhaust temperature.

[0109] It is understandable that in defrost mode, when the refrigerant flow rate or velocity within the air conditioner's piping decreases, the air conditioner's defrost performance will also decrease, and the air conditioner's defrost performance is related to the defrost operating current. That is, in defrost mode, when a refrigerant circulation failure occurs, the air conditioner's defrost operating current will change along with the defrost performance. While the defrost operating current may fluctuate, the current trend remains constant. Due to wear and tear of electrical components over extended periods of use, the air conditioner's operating frequency, operating current, and exhaust temperature may change. For example, if the operating frequency and operating current fail to reach standard thresholds, comparing the operating frequency, operating current, and exhaust temperature to their respective standard thresholds to determine whether the air conditioner has experienced an oil blockage fault is susceptible to the effects of equipment aging, which could interfere with the accuracy of the determination. Therefore, using the changing trends of the air conditioner's operating parameters to determine whether an oil blockage fault has occurred can mitigate the impact of parameter errors and improve the accuracy of fault detection.

[0110] It is understood that in defrost mode, when the refrigerant flow rate or velocity within the air conditioner piping decreases, the refrigerant flowing through the outdoor heat exchanger 400 cannot dissipate heat properly, which increases the load on the compressor 100 and causes a change in the exhaust temperature of the compressor 100, i.e., a change in the defrost exhaust temperature. While the defrost exhaust temperature may fluctuate, the temperature trend of the defrost exhaust temperature remains constant. Therefore, the air conditioner can be judged as being in a faulty state based on the current trend of the defrost operating current and the temperature trend of the defrost exhaust temperature.

[0111] Specifically, the current change trend of the defrost operating current can be calculated by obtaining multiple defrost operating currents within a certain time period. When the multiple defrost operating currents within a certain time period continue to rise, the current change trend can be considered to be an upward trend. When the multiple defrost operating currents within a certain time period continue to fall, the current change trend can be considered to be a downward trend. In addition, when the decrease amplitude of the multiple defrost operating currents within a certain time period is less than the increase amplitude of the multiple defrost operating currents, the current change trend can also be considered to be an upward trend. When the decrease amplitude of the multiple defrost operating currents within a certain time period is greater than the increase amplitude of the multiple defrost operating currents within a certain time period, the current change trend can be considered to be a downward trend. Similarly, the temperature change trend of the defrost exhaust temperature can be calculated by obtaining multiple defrost exhaust temperatures within a certain time period. When the multiple defrost exhaust temperatures within a certain time period continue to rise, the temperature change trend can be considered to be an upward trend. When the multiple defrost exhaust temperatures within a certain time period continue to fall, the temperature change trend can be considered to be a downward trend. In addition, when the decrease in multiple defrost exhaust temperatures within a certain time period is less than the increase in multiple defrost exhaust temperatures, the temperature change trend can also be considered to be an upward trend. When the decrease in multiple defrost exhaust temperatures within a certain time period is greater than the increase in multiple defrost exhaust temperatures, the temperature change trend can be considered to be a downward trend.

[0112] 7 , which is a diagram illustrating specific steps of step S210 shown in FIG6 , including but not limited to the following steps:

[0113] In step S211 , when the current variation trend of the defrost operation current meets the preset defrost current abnormality condition and the temperature variation trend of the defrost exhaust temperature meets the preset defrost exhaust abnormality condition, it is determined that the air conditioner is in a fault state.

[0114] It can be understood that when the air conditioner is in defrost mode, when the current change trend of the defrost operating current meets the preset defrost current abnormality condition and the temperature change trend of the defrost exhaust temperature meets the preset defrost exhaust abnormality condition, it can be determined that the air conditioner is in a refrigerant circulation failure.

[0115] It should be noted that the defrost power can be calculated using the defrost operating current and the air conditioner's input voltage. When the air conditioner's input voltage is constant, a decrease in the defrost operating current will result in a decrease in the defrost power, while an increase in the defrost operating current will result in an increase in the defrost power. The defrost power of an air conditioner is characterized by the air conditioner's defrost performance. In defrost mode, when the refrigerant flow rate or flow velocity in the air conditioner's pipes decreases, the refrigerant flowing through the outdoor heat exchanger 400 cannot dissipate heat normally, thereby increasing the load on the compressor 100 and causing the exhaust temperature of the compressor 100 to rise. Therefore, the preset abnormal defrost current condition can be that the current variation trend of the defrost operating current is a downward trend, and the preset abnormal defrost exhaust condition is that the temperature variation trend of the defrost exhaust temperature is an upward trend. That is, when the air conditioner's defrost performance decreases and the exhaust temperature of the compressor 100 increases, it can be considered that the air conditioner is experiencing a refrigerant circulation failure.

[0116] It should be noted that in defrost mode, if the air conditioner is not faulty, the defrost operating current may fluctuate, but the defrost operating current is always greater than the minimum defrost current under normal circumstances. Therefore, an abnormal defrost current condition can also include a downward current trend and a defrost operating current less than a preset defrost current threshold, where the preset defrost current threshold is the minimum defrost current under normal circumstances. This can avoid misjudgments when the air conditioner is operating normally but the defrost operating current trend is downward.

[0117] It is understood that in defrost mode, if a refrigerant circulation failure occurs in the air conditioner, the defrost operating current of the air conditioner is always greater than the minimum defrost current of the air conditioner under normal circumstances. In defrost mode, when a refrigerant circulation failure occurs in the air conditioner, the defrost performance of the air conditioner will continue to decline, that is, the defrost operating current will continue to decline. Therefore, by obtaining and comparing the defrost operating current at different times, it can be determined whether the defrost performance of the air conditioner is declining. In defrost mode, when the flow rate or flow velocity of the refrigerant in the air conditioner pipeline decreases, the refrigerant flowing through the outdoor heat exchanger 400 cannot dissipate heat normally, which will increase the load on the compressor 100, thereby causing the exhaust temperature of the compressor 100 to continue to rise. That is, by obtaining and comparing the defrost exhaust temperature at different times, it can be determined whether the load on the compressor 100 has increased. Therefore, the abnormal defrost current condition can be that the defrost operating current is less than the preset defrost current threshold and the defrost operating current is less than the defrost operating current at the previous moment, and the abnormal defrost exhaust condition is that the defrost exhaust temperature is higher than the defrost exhaust temperature at the previous moment.

[0118] Different air conditioner operating frequencies correspond to different refrigerant circulation speeds and pressures, which in turn lead to different lubricant viscosities. High-viscosity lubricants can adhere to the electronic expansion valve, causing oil blockage. Furthermore, as the air conditioner operates for longer, lubricant released from the refrigerant can adhere to the electronic expansion valve, forming oil flocs and increasing the risk of oil blockage.

[0119] Furthermore, when the air conditioner switches from heating mode to defrost mode, the operating conditions at both ends of the electronic expansion valve change dramatically, potentially exacerbating changes in lubricant viscosity and increasing the risk of oil blockage. Therefore, by assessing the risk of oil blockage based on the frequency and duration of the air conditioner's operation in heating mode and then controlling the opening of the electronic expansion valve in defrost mode, this can quickly mitigate oil blockage.

[0120] The following further describes the embodiments of the second aspect of the present application in conjunction with Figures 8-13.

[0121] In this embodiment, the throttling element 300 in Figure 1 is an electronic expansion valve. An opening controller for controlling the opening of the electronic expansion valve 300 is also provided within the electronic expansion valve 300. When the air conditioner operates in heating mode, a high-temperature, high-pressure refrigerant mixture is transported from the compressor 100 to the indoor heat exchanger 200 for heat exchange. The heat-exchanged refrigerant mixture then passes through the electronic expansion valve 300 and is then transported to the outdoor heat exchanger 400. Finally, it is transported back to the compressor 100 from the outdoor heat exchanger 400.

[0122] Specifically, when the air conditioner operates in heating mode at a low operating frequency, the refrigerant circulation rate decreases, causing the lubricating oil in compressor 100 to circulate more slowly. This in turn prolongs the time the lubricating oil remains in compressor 100, and therefore the time the lubricating oil remains in the high-temperature environment of compressor 100. Lubricating oil easily oxidizes in high-temperature environments, generating acidic substances. These acidic substances promote the degradation of the lubricating oil, increasing its viscosity. This increased viscosity can cause the lubricating oil to adhere to the electronic expansion valve 300, increasing the risk of oil blockage in the air conditioner. Furthermore, as the air conditioner operates for longer, lubricating oil that precipitates from the refrigerant will continuously adhere to both ends of the electronic expansion valve 300, forming oil flocs, which also increases the risk of oil blockage in the air conditioner. When the air conditioner switches from heating mode to defrost mode, the refrigerant circulation direction changes. The high-temperature, high-pressure refrigerant mixture is transported from compressor 100 to outdoor heat exchanger 400 for heat exchange. The heat-exchanged refrigerant mixture then passes through electronic expansion valve 300 and is then transported to indoor heat exchanger 200. Finally, it is transported back to compressor 100 from indoor heat exchanger 200. This can cause drastic changes in the operating conditions at both ends of electronic expansion valve 300, potentially exacerbating changes in lubricating oil viscosity and increasing the risk of oil blockage in the air conditioner. By changing the opening of electronic expansion valve 300, the pressure at both ends of electronic expansion valve 300 can be changed, thereby reducing the risk of oil blockage in the air conditioner.

[0123] Therefore, the risk of oil blockage failure of the air conditioner can be judged based on the operating frequency and operating time of the air conditioner in heating mode, and then the opening of the electronic expansion valve 300 of the air conditioner in defrost mode can be controlled to suppress the oil blockage failure of the air conditioner.

[0124] It should be noted that when air conditioners use R290 refrigerant as a refrigerant, due to its flammability, the amount of R290 refrigerant charged in the air conditioner is relatively small. If the operating conditions of the air conditioner change drastically, lubricating oil may precipitate from the R290 refrigerant, increasing the risk of oil blockage in the air conditioner.

[0125] 8 , which is a flow chart of a method for suppressing an oil blockage fault in an air conditioner according to an embodiment of the present application. The flow chart of the method for suppressing an oil blockage fault in an air conditioner can be applied to the air conditioner shown in FIG. 1 . The flow chart of the method for suppressing an oil blockage fault in an air conditioner includes but is not limited to the following steps:

[0126] Step S500, when the air conditioner is switched from the heating mode to the defrost mode, the operating frequency and operating time of the air conditioner in the heating mode are obtained;

[0127] Step S600 , controlling the opening of the electronic expansion valve of the air conditioner in the defrost mode according to the operating frequency and the operating time.

[0128] It is understandable that in heating mode, different operating frequencies correspond to different refrigerant circulation speeds and refrigerant pressures, and different refrigerant circulation speeds and refrigerant pressures correspond to different lubricating oil viscosities. For example, the lower the operating frequency, the lower the refrigerant circulation speed and refrigerant pressure, and the higher the viscosity of the lubricating oil. That is, a decrease in operating frequency will cause the viscosity of the lubricating oil to increase. High-viscosity lubricating oil will adhere to the pipes or electronic expansion valve 300 during the refrigerant circulation process, increasing the risk of oil blockage in the air conditioner. At the same time, the refrigerant in the air conditioner may precipitate lubricating oil during the flow process. Over time, the lubricating oil precipitated from the refrigerant will continue to adhere to the electronic expansion valve 300, forming oil flocs, increasing the risk of oil blockage in the air conditioner. Therefore, by obtaining the operating frequency and operating duration of the air conditioner in heating mode, the oil blockage risk of the air conditioner is pre-evaluated. Thus, when the air conditioner switches from heating mode to defrost mode, the opening of the electronic expansion valve 300 in defrost mode can be simultaneously controlled. By changing the opening of the electronic expansion valve 300, the risk of oil blockage in the air conditioner is reduced. Compared to the related art solution that determines the degree of oil blockage in the electronic expansion valve 300 by obtaining operating parameters in real time when the air conditioner is operating in defrost mode and then adjusts the opening of the electronic expansion valve 300, the embodiment of the present application predicts and evaluates the oil blockage risk of the air conditioner by using the operating parameters of the air conditioner in heating mode before switching to defrost mode, and then controls the opening of the electronic expansion valve 300 when the air conditioner switches to defrost mode. This saves the detection time required to obtain operating parameters after controlling the air conditioner to switch to defrost mode to determine the risk of oil blockage, thereby reducing the duration of oil blockage and quickly and effectively reducing the risk of oil blockage.

[0129] It should be noted that the greater the opening of the electronic expansion valve 300, the smaller the relative pressure difference between the refrigerant across the electronic expansion valve 300. This smaller pressure difference between the refrigerant across the electronic expansion valve 300 affects the air conditioner's operating efficiency. Specifically, when the air conditioner is operating in defrost mode, the greater the opening of the electronic expansion valve 300, the lower the defrost efficiency. When the air conditioner is operating in heating mode, the greater the opening of the electronic expansion valve 300, the lower the heating efficiency. Therefore, when the air conditioner is in heating mode, the opening of the electronic expansion valve is maintained, and when it switches to defrost mode, the opening of the electronic expansion valve 300 is adjusted. Specifically, the opening of the electronic expansion valve 300 is only adjusted in defrost mode. This avoids adjusting the electronic expansion valve 300 in heating mode, which would reduce the air conditioner's heating efficiency and sacrifice the air conditioner's defrost efficiency. This effectively reduces the risk of oil blockage while prioritizing heating efficiency.

[0130] It should be noted that the opening of the electronic expansion valve 300 of the air conditioner in the heating mode can be adjusted according to the actual situation during the operation of the air conditioner in the heating mode to reduce the risk of oil blockage failure of the air conditioner in the heating mode.

[0131] It should be noted that the longer the air conditioner operates in heating mode, the more oil floccules are likely to accumulate in the electronic expansion valve 300, and the greater the risk of oil blockage. The lower the operating frequency of the air conditioner in heating mode, the higher the viscosity of the lubricating oil is likely to be, and the greater the risk of oil blockage. Therefore, the opening of the electronic expansion valve 300 in defrost mode can be directly controlled based on the operating frequency and operating time in heating mode. For example, the lower the operating frequency, the wider the opening of the electronic expansion valve 300 in defrost mode; and the longer the operating time, the wider the opening of the electronic expansion valve 300 in defrost mode.

[0132] It should be noted that the operating frequency and operating duration of the air conditioner in heating mode can also be input into a preset air conditioner oil blockage fault model for risk prediction. The opening of the electronic expansion valve 300 in defrost mode can then be adjusted based on the output risk prediction results. Using the air conditioner oil blockage fault model to predict the air conditioner oil blockage fault risk can effectively improve the accuracy of the risk prediction. The risk prediction result represents the overall oil blockage risk of the air conditioner. The greater the overall oil blockage risk, the greater the opening of the electronic expansion valve 300.

[0133] It should be noted that the operating frequency and operating duration of the air conditioner in the heating mode may correspond to different risks of oil blockage in the air conditioner, and different oil blockage risks may correspond to different openings of the electronic expansion valve in the defrost mode. Therefore, the opening of the electronic expansion valve 300 in the defrost mode can also be calculated based on the operating frequency and operating duration of the air conditioner in the heating mode, and then the opening of the electronic expansion valve 300 in the defrost mode can be adjusted based on the calculation results. For example, the opening of the electronic expansion valve 300 in the defrost mode can be calculated as a first opening based on the operating frequency in the heating mode, and the opening of the electronic expansion valve 300 in the defrost mode can be calculated as a second opening based on the operating duration in the heating mode. The larger of the first and second openings is then selected as the target opening, and the opening of the electronic expansion valve 300 in the defrost mode is adjusted, thereby more effectively suppressing the risk of oil blockage in the air conditioner.

[0134] It should be noted that the operating frequency can be the operating frequency of the air conditioner within a time period before the heating mode ends. By obtaining data before the heating mode ends, the accuracy of the judgment is improved. The time period in the embodiment of the present application can be adjusted according to actual conditions, for example, one minute before the heating mode ends or one-third of the operating time of the heating mode.

[0135] It should be noted that when the air conditioner is below the preset frequency threshold, lubricating oil may precipitate from the refrigerant. Therefore, the operating time can be the cumulative operating time of the air conditioner in heating mode at an operating frequency lower than the preset frequency threshold.

[0136] 9 , which is a diagram illustrating specific steps of step S600 shown in FIG8 , including but not limited to the following steps:

[0137] Step S610, determining an oil blockage detection result based on the operating frequency and the operating time, where the oil blockage detection result is used to indicate the possibility of an oil blockage fault occurring in the air conditioner;

[0138] Step S620 , controlling the opening of the electronic expansion valve 300 of the air conditioner in the defrost mode according to the oil blockage detection result.

[0139] It is understandable that different operating durations and operating frequencies in the air conditioner's heating mode have different impacts on the risk of an oil blockage failure. Therefore, an oil blockage detection result can be determined based on the air conditioner's operating frequency and operating duration in the heating mode. The oil blockage detection result represents the likelihood of an oil blockage failure in the air conditioner. After the air conditioner switches from the heating mode to the defrost mode, the opening of the electronic expansion valve 300 in the defrost mode is controlled based on the different oil blockage detection results, thereby mitigating the risk of an oil blockage failure in the air conditioner. For example, if the oil blockage detection result indicates a high risk of oil blockage, the opening of the electronic expansion valve 300 is controlled to increase after the air conditioner switches from the heating mode to the defrost mode; if the oil blockage detection result indicates a low risk of oil blockage, the opening of the electronic expansion valve 300 is controlled to decrease after the air conditioner switches from the heating mode to the defrost mode.

[0140] It should be noted that in heating mode, different operating frequencies and operating durations of the air conditioner correspond to different oil blockage failure risks. The oil blockage failure risk probability corresponding to the operating frequency of the air conditioner in heating mode is the first oil blockage failure risk probability, while the oil blockage failure risk probability corresponding to the operating duration of the air conditioner in heating mode is the second oil blockage failure risk probability. Therefore, the oil blockage detection result can be determined based on the first and second oil blockage failure risk probabilities. The opening of the electronic expansion valve 300 in defrost mode can then be controlled based on the different oil blockage detection results. Specifically, by determining the corresponding oil blockage failure risk probability for the operating frequency and the operating time respectively, the oil blockage failure risk probabilities of the two can be combined to accurately determine the oil blockage detection result. For example, the oil blockage detection result can be the average of the first oil blockage failure risk probability and the second oil blockage failure risk probability. When the oil blockage detection result is greater than the first probability threshold, it indicates that the risk of the air conditioner having an oil blockage failure is high. After the air conditioner switches from the heating mode to the defrost mode, the electronic expansion valve 300 can be controlled to the maximum opening, thereby suppressing the oil blockage failure of the air conditioner to the greatest extent; when the oil blockage detection result is less than the first probability threshold and greater than the second probability threshold, it indicates that the risk of the air conditioner having an oil blockage failure is low. After the air conditioner switches from the heating mode to the defrost mode, the opening of the electronic expansion valve 300 can be controlled to half of the maximum opening value, thereby suppressing the oil blockage failure of the air conditioner while reducing the attenuation of the defrost performance, thereby ensuring the defrost efficiency.

[0141] 10 , which is a diagram illustrating specific steps of step S620 shown in FIG. 9 , including but not limited to the following steps:

[0142] Step S621: When the oil blockage detection result meets the oil blockage risk condition, the opening of the electronic expansion valve 300 of the air conditioner in the defrost mode is controlled to be the maximum opening;

[0143] Step S622: When the oil blockage detection result does not meet the oil blockage risk condition, the opening of the electronic expansion valve 300 of the air conditioner in the defrost mode is controlled according to the operating frequency and the operating time.

[0144] It is understood that when the oil blockage detection result meets the oil blockage risk condition, the air conditioner can be considered to have a high oil blockage risk. Therefore, the opening of the electronic expansion valve 300 can be adjusted to the maximum opening in the defrost mode. When the oil blockage detection result does not meet the oil blockage risk condition, the air conditioner can be considered to have an oil blockage risk, but it is not necessary to adjust the opening of the electronic expansion valve 300 to the maximum opening in the defrost mode. In this case, the opening of the electronic expansion valve 300 in the defrost mode can be controlled based on the operating frequency and operating time of the air conditioner in the heating mode.

[0145] It should be noted that in heating mode, when the air conditioner's operating frequency falls below a first preset frequency threshold, the viscosity of the lubricating oil increases to the point where it risks adhering to the electronic expansion valve 300, leading to a high risk of oil blockage in the air conditioner. In heating mode, if the air conditioner's operating duration exceeds a first preset duration threshold, accumulated oil floccules within the electronic expansion valve 300 may cause oil blockage in the air conditioner. Therefore, the oil blockage risk condition can be an operating frequency less than or equal to the first preset frequency threshold, an operating duration greater than or equal to the first preset duration threshold, or a combination of an operating frequency less than or equal to the first preset frequency threshold and an operating duration greater than or equal to the first preset duration threshold.

[0146] 11 , which is a diagram illustrating specific steps of another embodiment of step S600 shown in FIG9 , including but not limited to the following steps:

[0147] Step S630, determining a target opening according to the operating time and the frequency difference between the operating frequency and a second preset frequency threshold;

[0148] Step S640 , controlling the opening of the electronic expansion valve 300 of the air conditioner in the defrost mode to be the target opening.

[0149] It is understood that the shorter the air conditioner's operating time in heating mode, the less lubricating oil adheres to the electronic expansion valve 300, and the lower the risk of oil blockage. Therefore, the opening of the electronic expansion valve 300 in defrost mode can be adjusted accordingly. The higher the air conditioner's operating frequency and the greater the pressure within the air conditioner pipe, the lower the viscosity of the lubricating oil. This means that the lubricating oil is less likely to adhere to the electronic expansion valve 300, and the lower the risk of oil blockage. Therefore, the target opening of the air conditioner in defrost mode can be determined based on the air conditioner's operating time in heating mode or the frequency difference between the air conditioner's operating frequency and a second preset frequency. For example, the longer the air conditioner's operating time in heating mode, the larger the target opening of the electronic expansion valve 300 in defrost mode. For another example, the smaller the frequency difference between the air conditioner's operating frequency in heating mode and the second preset frequency threshold, the larger the target opening of the electronic expansion valve 300 in defrost mode.

[0150] It should be noted that the target opening can also be determined based on the operating time and the frequency difference between the operating frequency and the second preset frequency threshold. By comprehensively considering the operating time and the frequency difference between the operating frequency and the second preset frequency threshold, the target opening is determined, thereby improving the data reliability of the target opening. For example, if the target opening corresponding to the frequency difference between the operating frequency and the second preset frequency threshold is smaller than the target opening corresponding to the operating time, the target opening corresponding to the operating time is used as the opening of the electronic expansion valve 300 in the defrost mode. For another example, the opening of the electronic expansion valve 300 in the defrost mode can be the average of the target opening corresponding to the frequency difference between the operating frequency and the second preset frequency threshold and the target opening corresponding to the operating time.

[0151] It should be noted that the second preset frequency threshold may be the first preset frequency threshold, and the second preset frequency threshold may also be the average operating frequency of the air conditioner in the heating mode.

[0152] 12 , which is a diagram illustrating specific steps of step S630 shown in FIG. 11 , including but not limited to the following steps:

[0153] Step S631, obtaining an opening adjustment parameter, multiplying the inverse of the operating time, the opening adjustment parameter, and the frequency difference between the operating frequency and the second preset frequency threshold to obtain an adjustment amplitude;

[0154] Step S632: The target opening is obtained by subtracting the adjustment range from the maximum opening of the electronic expansion valve 300 of the air conditioner.

[0155] It can be understood that the shorter the air conditioner's operating time in heating mode, the lower the probability of lubricating oil adhering to the electronic expansion valve 300, and thus the lower the risk of oil blockage. The higher the air conditioner's operating frequency, the greater the pressure within the air conditioner piping, which in turn leads to lower viscosity of the lubricating oil, meaning it is less likely for the lubricating oil to adhere to the electronic expansion valve 300, and the lower the risk of oil blockage. Therefore, the shorter the air conditioner's operating time before switching from heating mode to defrost mode, the smaller the opening of the electronic expansion valve 300 relative to its maximum opening after switching from heating mode to defrost mode. Similarly, the higher the air conditioner's operating frequency before switching from heating mode to defrost mode, the smaller the opening of the electronic expansion valve 300 relative to its maximum opening after switching from heating mode to defrost mode.

[0156] Specifically, the operating frequency and operating time of the air conditioner in the heating mode can be obtained, and then the inverse of the operating time, the opening adjustment parameter, and the difference between the operating frequency and the second preset frequency threshold are multiplied to calculate the result. The calculation result is the adjustment amplitude of the electronic expansion valve 300 after switching from the heating mode to the defrost mode. By calculating the difference between the maximum opening of the electronic expansion valve 300 and the adjustment amplitude, the target opening of the electronic expansion valve 300 in the defrost mode can be calculated.

[0157] It should be noted that multiplying the inverse of the operating hours by the frequency difference between the operating frequency and the second preset frequency threshold only calculates the risk of an oil blockage failure in the air conditioner. Therefore, it is necessary to convert the oil blockage risk into the adjustment range of the electronic expansion valve 300 using the opening adjustment parameter. The opening adjustment parameter can be a preset parameter or the opening degree of the electronic expansion valve 300 in the air conditioner's heating mode.

[0158] Specifically, when the opening adjustment parameter is the opening of the electronic expansion valve 300 in the air conditioner's heating mode, the adjustment range of the electronic expansion valve 300 in the air conditioner's defrost mode is determined based on the opening of the electronic expansion valve 300 in the heating mode and the risk of an oil blockage failure in the air conditioner. The adjustment range of the electronic expansion valve 300 in the defrost mode is affected not only by the risk of an oil blockage failure in the air conditioner, but also by the opening of the electronic expansion valve 300 in the heating mode. Therefore, using the opening of the electronic expansion valve 300 in the heating mode as the opening adjustment parameter can ensure that the target opening of the electronic expansion valve 300 in the defrost mode is more consistent with the current risk of an oil blockage failure in the air conditioner.

[0159] It should be noted that the second preset frequency threshold may be the first preset frequency threshold, and the second preset frequency threshold may also be the average operating frequency of the air conditioner in the heating mode.

[0160] 13 , which is a diagram illustrating specific steps of step S640 shown in FIG. 11 , including but not limited to the following steps:

[0161] Step S641, obtaining the opening adjustment duration according to the frequency difference between the operating frequency and the second preset frequency threshold, and / or the time difference between the operating duration and the second preset duration threshold;

[0162] It is understandable that increasing the opening of the electronic expansion valve 300 in defrost mode helps reduce the risk of oil blockage in the air conditioner. However, the larger the opening of the electronic expansion valve 300, the lower the defrost efficiency of the air conditioner, thereby extending the operating time of the defrost mode. However, the risk of oil blockage in the air conditioner is not constant. After the opening of the electronic expansion valve 300 is increased for a period of time in defrost mode, the risk of oil blockage in the air conditioner will decrease. Therefore, after the opening of the electronic expansion valve 300 is increased or decreased for a period of time, the opening of the electronic expansion valve 300 can be adjusted to the normal opening to reduce the impact of the opening adjustment of the electronic expansion valve 300 on the defrost efficiency of the air conditioner.

[0163] Specifically, the opening adjustment duration can be determined by the frequency difference between the operating frequency and a second preset frequency threshold, or the time difference between the operating duration and the second preset duration threshold. The opening adjustment duration is the duration during which the electronic expansion valve 300 is opened at the target opening in the defrost mode. For example, the smaller the frequency difference between the operating frequency and the second preset frequency threshold, the longer the opening adjustment duration; and the larger the time difference between the operating duration and the first preset duration threshold, the longer the opening adjustment duration. The first preset time threshold indicates that when the operating duration of the air conditioner in heating mode reaches the first preset time threshold, a large amount of oil floccules accumulate in the electronic expansion valve 300, and the risk of oil blockage in the air conditioner increases.

[0164] It should be noted that in the heating mode, the opening adjustment time corresponding to the frequency difference between the operating frequency of the air conditioner and the second preset frequency threshold is the first opening adjustment time, and in the heating mode, the opening adjustment time corresponding to the time difference between the operating time of the air conditioner and the second preset time threshold is the second opening adjustment time. The opening adjustment time can also be determined based on the first opening adjustment time and the second opening adjustment time.

[0165] Specifically, when the first opening adjustment time is less than the second opening adjustment time, the second opening adjustment time is taken as the opening adjustment time. For another example, the opening adjustment time may be the average of the first opening adjustment time and the second opening adjustment time.

[0166] In the third aspect, referring to Figure 14, an embodiment of the present application provides an operation control device 800, including a memory 810, a processor 820 and a computer program stored on the memory 810 and executable on the processor 820. The processor 820 executes the program to implement the oil blockage fault detection method for the air conditioner according to the first aspect embodiment and the oil blockage fault suppression method for the air conditioner according to the second aspect embodiment, for example, executing method steps S100 to S400 in Figure 2, method steps S410 to S420 in Figure 3, method step S421 in Figure 4, method step S422 in Figure 5, method step S210 in Figure 6, method step S211 in Figure 7, method steps S500 to S600 in Figure 8, method steps S610 to S620 in Figure 9, method steps S621 to S622 in Figure 10, method steps S630 to S640 in Figure 11, method steps S631 to 632 in Figure 12, and method step S641 in Figure 13.

[0167] Memory 810, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs, such as the air conditioner oil blockage fault detection and suppression method described in the above-mentioned embodiments of the present application. Processor 820 implements the air conditioner oil blockage fault detection and suppression method described in the above-mentioned embodiments of the present application by executing the non-transitory software programs and instructions stored in memory 810.

[0168] The memory 810 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data required to execute the oil blockage fault detection method for the air conditioner in the above embodiment, etc. In addition, the memory 810 may include a high-speed random access memory 810, and may also include a non-volatile memory 810, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. It should be noted that the memory 810 may optionally include a memory 810 remotely located relative to the processor 820, and these remote memories 810 may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0169] In a fourth aspect, an embodiment of the present application provides an air conditioner, comprising an operation control device 800 as in the embodiment of the third aspect. When the air conditioner uses R290 refrigerant as a refrigerant, due to the flammability of R290 refrigerant, the amount of R290 refrigerant filled in the air conditioner is relatively small. If the operating conditions of the air conditioner change drastically, lubricating oil may precipitate from the R290 refrigerant, and then clog at both ends of the throttling element, causing an oil blockage failure in the air conditioner. When the defrost operation time reaches the defrost abnormal time, it can be considered that the air conditioner has a performance abnormality in the defrost mode. Therefore, the defrost operation current and defrost exhaust temperature of the air conditioner in the defrost mode can be used to make a preliminary fault judgment on the refrigerant circulation situation. Because the air conditioner exhibits different operating conditions when switching from defrost mode to heating mode when experiencing oil blockage and refrigerant leakage, the operating data of the air conditioner in heating mode differs under different fault conditions, namely, the heating operating current and heating operating frequency differ. Therefore, when it is determined that the air conditioner's refrigerant circulation has a fault, that is, the air conditioner is in a defrost fault state, the heating operating current and heating operating frequency can be used to further judge the fault condition of the air conditioner to determine whether an oil blockage fault has occurred. Therefore, by comprehensively analyzing and judging the fault of the air conditioner based on the operating data of the air conditioner in defrost mode and in heating mode, it is possible to accurately determine whether the air conditioner has an oil blockage fault. Then, by controlling the opening of the electronic expansion valve of the air conditioner in defrost mode, the occurrence of an oil blockage fault in the air conditioner can be quickly suppressed.

[0170] In the fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are used to enable a computer to execute the oil blockage fault detection method for an air conditioner as described in the first aspect of the embodiment above, such as executing method steps S100 to S400 in Figure 2, method steps S410 to S420 in Figure 3, method step S421 in Figure 4, method step S422 in Figure 5, method step S210 in Figure 6, method step S211 in Figure 7, method steps S500 to S600 in Figure 8, method steps S610 to S620 in Figure 9, method steps S621 to S622 in Figure 10, method steps S630 to S640 in Figure 11, method steps S631 to 632 in Figure 12, and method step S641 in Figure 13.

[0171] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer-readable media, which can include computer storage media or non-transitory media and communication media or transient media. As is well known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0172] Some embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A method for detecting oil blockage fault of an air conditioner, comprising: In the defrost mode, when the defrost operation time of the air conditioner reaches the defrost abnormal time, obtaining the defrost operation current and the defrost exhaust temperature of the air conditioner in the defrost mode; The defrost operation duration is the operation duration during which the defrost operation frequency of the air conditioner reaches a first preset frequency; determining whether the air conditioner is in a defrost fault state according to the defrost operation current and the defrost exhaust temperature; When the air conditioner is in a defrosting fault state, controlling the air conditioner to switch to a heating mode, and obtaining a heating operation current and a heating operation frequency of the air conditioner in the heating mode; as well as It is determined whether an oil blockage fault occurs in the air conditioner according to the heating operation current and the heating operation frequency.

2. The oil blockage fault detection method according to claim 1, wherein: The determining whether the air conditioner has an oil blockage fault according to the heating operation current and the heating operation frequency includes: Obtaining a heating current detection result according to the heating operation current and a preset heating current threshold, and obtaining a heating frequency detection result according to the heating operation frequency and a preset heating frequency threshold; It is determined whether an oil blockage fault occurs in the air conditioner according to the heating current detection result and the heating frequency detection result.

3. The oil blockage fault detection method according to claim 2, wherein: The determining whether the air conditioner has an oil blockage fault according to the heating current detection result and the heating frequency detection result includes: When the heating current detection result meets the preset heating current abnormality condition, and the heating frequency detection result meets the preset heating frequency abnormality condition, it is determined that the air conditioner has an oil blockage fault.

4. The oil blockage fault detection method according to claim 2 or 3, wherein: The determining whether the air conditioner has an oil blockage fault according to the heating current detection result and the heating frequency detection result includes: When the heating current detection result does not meet the preset heating current abnormal condition, or the heating frequency detection result does not meet the preset heating frequency abnormal condition, the condenser outlet temperature of the air conditioner is obtained, and based on the condenser outlet temperature and the preset condensing temperature threshold, it is determined whether the air conditioner has an oil blockage fault.

5. The oil blockage fault detection method according to claim 4, wherein: The determining whether the air conditioner has an oil blockage fault according to the condenser outlet temperature and a preset condensing temperature threshold value includes: When the condenser outlet temperature is lower than a preset condensing temperature threshold, it is determined that an oil blockage fault occurs in the air conditioner.

6. The oil blockage fault detection method according to any one of claims 3 to 5, wherein: The abnormal heating current condition is that the heating operation current is greater than or equal to a preset heating current threshold; the abnormal heating frequency condition is that the heating operation frequency is greater than a preset heating frequency threshold.

7. The oil blockage fault detection method according to any one of claims 1 to 6, wherein: The step of determining whether the air conditioner is in a defrost fault state according to the defrost operation current and the defrost exhaust temperature includes: Whether the air conditioner is in a fault state is determined according to the current variation trend of the defrost operation current and the temperature variation trend of the defrost exhaust temperature.

8. The oil blockage fault detection method according to claim 7, wherein: The determining whether the air conditioner is in a fault state according to the current variation trend of the defrost operation current and the temperature variation trend of the defrost exhaust temperature comprises: When the current variation trend of the defrost operation current meets the preset defrost current abnormality condition, and the temperature variation trend of the defrost exhaust temperature meets the preset defrost exhaust abnormality condition, it is determined that the air conditioner is in a fault state.

9. The oil blockage fault detection method according to claim 8, wherein: The abnormal defrost current condition is that the defrost operating current is less than a preset defrost current threshold, and the defrost operating current is less than the defrost operating current at the previous moment; the abnormal defrost exhaust condition is that the defrost exhaust temperature is higher than the defrost exhaust temperature at the previous moment.

10. A method for suppressing oil blockage fault of an air conditioner, comprising: When the air conditioner is switched from the heating mode to the defrosting mode, obtaining the operating frequency and operating time of the air conditioner in the heating mode; The opening degree of the electronic expansion valve of the air conditioner in the defrost mode is controlled according to the operating frequency and the operating time.

11. The method for suppressing oil blockage failure according to claim 10, wherein: The step of controlling the opening of the electronic expansion valve of the air conditioner in the defrost mode according to the operating frequency and the operating time includes: Determining an oil blockage detection result according to the operating frequency and the operating time, wherein the oil blockage detection result is used to indicate the possibility of an oil blockage failure of the air conditioner; and According to the oil blockage detection result, the opening degree of the electronic expansion valve of the air conditioner in the defrost mode is controlled.

12. The method for suppressing oil blockage failure according to claim 11, wherein: The step of controlling the opening of the electronic expansion valve of the air conditioner in the defrost mode according to the oil blockage detection result comprises: When the oil blockage detection result meets the oil blockage risk condition, controlling the opening degree of the electronic expansion valve of the air conditioner in the defrost mode to be the maximum opening degree; or, When the oil blockage detection result does not meet the oil blockage risk condition, the opening of the electronic expansion valve of the air conditioner in the defrost mode is controlled according to the operating frequency and the operating time.

13. The method for suppressing oil blockage failure according to claim 12, wherein: The oil blockage risk condition is that the operating frequency is less than or equal to a first preset frequency threshold, or the operating duration is greater than or equal to a first preset duration threshold, or the operating frequency is less than or equal to the first preset frequency threshold and the operating duration is greater than or equal to the first preset duration threshold.

14. The method for suppressing oil blockage failure according to any one of claims 10 to 13, wherein: The step of controlling the opening of the electronic expansion valve of the air conditioner in the defrost mode according to the operating frequency and the operating time includes: Determining a target opening according to the operating time and a frequency difference between the operating frequency and a second preset frequency threshold; and The opening degree of the electronic expansion valve of the air conditioner in the defrost mode is controlled to be a target opening degree.

15. The method for suppressing oil blockage failure according to claim 14, wherein: The determining the target opening according to the operating time and a second frequency difference between the operating frequency and a second preset frequency threshold value includes: Acquire an opening adjustment parameter, and calculate the product of the inverse of the operating time, the opening adjustment parameter, and the frequency difference between the operating frequency and a second preset frequency threshold to obtain an adjustment amplitude; and The target opening degree is obtained by subtracting the adjustment amplitude from the maximum opening degree of the electronic expansion valve of the air conditioner.

16. The method for suppressing oil blockage failure according to claim 14 or 15, wherein: The method of controlling the opening degree of the electronic expansion valve of the air conditioner in the defrost mode to be a target opening degree comprises: Obtaining the opening adjustment duration according to the frequency difference between the operating frequency and the second preset frequency threshold, and / or the time difference between the operating duration and the second preset duration threshold; and The air conditioner is controlled to operate the opening adjustment time with the opening of the electronic expansion valve as the target opening in the defrost mode.

17. The method for suppressing oil blockage failure according to any one of claims 10 to 16, wherein: The operation duration is a cumulative operation duration during which the air conditioner operates at an operation frequency lower than a preset frequency threshold in the heating mode.

18. The method for suppressing oil blockage failure according to any one of claims 10 to 17, wherein: The operating frequency is the operating frequency of the air conditioner within a time period before the heating mode ends.

19. An operation control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the oil blockage fault detection and suppression method for the air conditioner as described in any one of claims 1 to 18.

20. An air conditioner comprising the operation control device according to claim 19.

21. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to enable a computer to execute the oil blockage fault detection and suppression method for an air conditioner according to any one of claims 1 to 18.

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