Oil blockage fault detection method of air conditioner, control device, air conditioner and medium

Abstract

The invention discloses an oil blockage fault detection method and control device of an air conditioner, the air conditioner and a medium, and the oil blockage fault detection method comprises the steps that in a defrosting mode, when the defrosting operation duration of the air conditioner reaches the defrosting abnormal duration, the defrosting operation current and the defrosting exhaust temperature of the air conditioner in the defrosting mode are obtained; the defrosting operation duration is the operation duration when the defrosting operation frequency of the air conditioner reaches the first preset frequency; whether the air conditioner is in a defrosting fault state or not is determined according to the defrosting operation current and the defrosting exhaust temperature; when the air conditioner is in the defrosting fault state, the air conditioner is controlled to be switched to a heating mode, and the heating operation current and the heating operation frequency of the air conditioner in the heating mode are obtained; and according to the heating operation current and the heating operation frequency, whether the air conditioner has an oil blockage fault or not is determined. According to the oil blockage fault detection method provided by the embodiment of the invention, the oil blockage fault of the air conditioner can be accurately detected.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an oil blockage fault detection method, a control device, an air conditioner and a medium for an air conditioner. Background Art

[0002] For an air conditioner using R290 environmental protection refrigerant, due to the low refrigerating capacity per unit volume of R290 refrigerant, a large-displacement compressor is usually adopted to improve the refrigerating capacity. At the same time, due to its flammability, the charging amount is extremely low. During the process of drastic change of working conditions, the refrigerant / lubricating oil mixture is prone to stratified flow. Based on the above characteristics of the R290 refrigerant air conditioner system, during the conversion process of heating and defrosting of the air conditioner in the heating low-temperature working condition, when the refrigerant / lubricating oil mixture passes through the throttling element, the pressure is prone to sudden drop, resulting in changes in the solubility and viscosity of the lubricating oil. In severe cases, the throttling element is blocked, resulting in an oil blockage phenomenon, which affects the normal operation performance of the air conditioner.

[0003] At present, the air conditioner fault detection method can only detect the insufficient performance of the air conditioner to judge that the air conditioner has an abnormal fault, and cannot accurately identify the difference between the oil blockage and refrigerant leakage faults. Therefore, usually any one of the faults such as refrigerant leakage or oil blockage is used to replace the specific fault reason, resulting in the inability to quickly lock the real reason for the air conditioner to have a fault, and it is difficult to take appropriate measures for remedial treatment in time. Summary of the Invention

[0004] The purpose of the present invention is to at least solve one of the technical problems existing in the prior art, and provide an oil blockage fault detection method, a control device, an air conditioner and a medium for an air conditioner, which can accurately detect the oil blockage fault of the air conditioner.

[0005] In a first aspect, an embodiment of the present invention provides an oil blockage fault detection method for an air conditioner, including:

[0006] In the defrosting mode, when the defrosting operation duration of the air conditioner reaches the defrosting abnormal duration, obtain the defrosting operation current and the defrosting exhaust temperature of the air conditioner in the defrosting mode; the defrosting operation duration is the operation duration when the defrosting operation frequency of the air conditioner reaches the first preset frequency;

[0007] Determine whether the air conditioner is in a defrosting fault state according to the defrosting operation current and the defrosting exhaust temperature;

[0008] When the air conditioner is in a defrosting fault state, control the air conditioner to switch to the heating mode, and obtain the heating operation current and the heating operation frequency of the air conditioner in the heating mode;

[0009] Determine whether the air conditioner has an oil blockage fault according to the heating operation current and the heating operation frequency.

[0010] The oil blockage fault detection method of the air conditioner provided by the embodiment of the present invention has at least the following beneficial effects: when the defrosting operation duration reaches the abnormal defrosting duration, it can be considered that the air conditioner has abnormal performance in the defrosting mode. Therefore, the defrosting operation current and defrosting exhaust temperature of the air conditioner in the defrosting mode can be used to make a preliminary fault judgment on the refrigerant circulation situation. Since the operation situations of the air conditioner when an oil blockage fault occurs and when a refrigerant leakage fault occurs are different during the process of switching from the defrosting mode to the heating mode, the operation data of the air conditioner in the heating mode (i.e., the heating operation current and heating operation frequency) are different under different fault conditions. Thus, when it is determined that a fault occurs in the refrigerant circulation of the air conditioner, that is, the air conditioner is in the defrosting fault state, the heating operation current and heating operation frequency can be used to further judge the fault situation of the air conditioner to determine whether an oil blockage fault occurs. Therefore, by comprehensively analyzing and judging the faults of the air conditioner based on the operation data of the air conditioner in the defrosting mode and the heating mode, it is possible to accurately judge whether the air conditioner has an oil blockage fault.

[0011] According to the oil blockage fault detection method of the air conditioner provided by some embodiments of the present invention, determining whether the air conditioner has an oil blockage fault according to the heating operation current and the heating operation frequency includes:

[0012] 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;

[0013] Determining whether the air conditioner has an oil blockage fault according to the heating current detection result and the heating frequency detection result.

[0014] According to the oil blockage fault detection method of the air conditioner provided by some embodiments of the present invention, determining whether the air conditioner has an oil blockage fault according to the heating current detection result and the heating frequency detection result includes:

[0015] 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, it is determined that the air conditioner has an oil blockage fault.

[0016] According to the oil blockage fault detection method of the air conditioner provided by some embodiments of the present invention, determining whether the air conditioner has an oil blockage fault according to the heating current detection result and the heating frequency detection result includes:

[0017] When the detected heating current does not meet the preset abnormal heating current condition, or the detected heating frequency does not meet the preset abnormal heating frequency condition, obtain the condenser outlet temperature of the air conditioner, and determine whether an oil blockage fault occurs in the air conditioner according to the condenser outlet temperature and a preset condensation temperature threshold.

[0018] According to the oil blockage fault detection method of an air conditioner provided by some embodiments of the present invention, the determining whether an oil blockage fault occurs in the air conditioner according to the condenser outlet temperature and a preset condensation temperature threshold includes:

[0019] When the condenser outlet temperature is less than the preset condensation temperature threshold, determine that an oil blockage fault occurs in the air conditioner.

[0020] According to the oil blockage fault detection method of an air conditioner provided by some embodiments of the present invention, 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.

[0021] According to the oil blockage fault detection method of an air conditioner provided by some embodiments of the present invention, the determining whether the air conditioner is in a defrosting fault state according to the defrosting operating current and the defrosting exhaust temperature includes:

[0022] Determine whether the air conditioner is in a fault state according to the current change trend of the defrosting operating current and the temperature change trend of the defrosting exhaust temperature.

[0023] According to the oil blockage fault detection method of an air conditioner provided by some embodiments of the present invention, the determining whether the air conditioner is in a fault state according to the current change trend of the defrosting operating current and the temperature change trend of the defrosting exhaust temperature includes;

[0024] When the current change trend of the defrosting operating current meets the preset abnormal defrosting current condition, and the temperature change trend of the defrosting exhaust temperature meets the preset abnormal defrosting exhaust condition, determine that the air conditioner is in a fault state.

[0025] According to the oil blockage fault detection method of an air conditioner provided by some embodiments of the present invention, the abnormal defrosting current condition is that the defrosting operating current is less than a preset defrosting current threshold, and the defrosting operating current is less than the defrosting operating current at the previous moment; the abnormal defrosting exhaust condition is that the defrosting exhaust temperature is higher than the defrosting exhaust temperature at the previous moment.

[0026] In a second aspect, an embodiment of the present invention provides an operation control device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the program to implement the oil blockage fault detection method for an air conditioner as described in the first aspect embodiment above.

[0027] The operation control device provided by the embodiment of the present invention has at least the following beneficial effects: When the defrosting operation duration reaches the abnormal defrosting duration, it can be considered that the air conditioner has abnormal performance in the defrosting mode. Therefore, the defrosting operation current and defrosting exhaust temperature of the air conditioner in the defrosting mode can be used to make a preliminary fault judgment on the refrigerant circulation situation. Since the operation conditions shown when the air conditioner has an oil blockage fault and other faults such as refrigerant leakage are different during the process of switching from the defrosting mode to the heating mode, the operation data of the air conditioner in the heating mode (i.e., the heating operation current and heating operation frequency) are different under different fault conditions. Thus, when it is determined that a fault occurs in the refrigerant circulation of the air conditioner, that is, the air conditioner is in a defrosting fault state, the heating operation current and heating operation frequency can be used to further judge the fault situation of the air conditioner to determine whether an oil blockage fault occurs. Therefore, by comprehensively analyzing and judging the faults of the air conditioner based on the operation data of the air conditioner in the defrosting mode and the operation data in the heating mode, it is possible to accurately judge whether the air conditioner has an oil blockage fault.

[0028] In a third aspect, an embodiment of the present invention provides an air conditioner, which includes the operation control device described in the second aspect embodiment.

[0029] The air conditioner provided by the embodiment of the present invention has at least the following beneficial effects: When the defrosting operation duration reaches the abnormal defrosting duration, it can be considered that the air conditioner has abnormal performance in the defrosting mode. Therefore, the defrosting operation current and defrosting exhaust temperature of the air conditioner in the defrosting mode can be used to make a preliminary fault judgment on the refrigerant circulation situation. Since the operation conditions shown when the air conditioner has an oil blockage fault and other faults such as refrigerant leakage are different during the process of switching from the defrosting mode to the heating mode, the operation data of the air conditioner in the heating mode (i.e., the heating operation current and heating operation frequency) are different under different fault conditions. Thus, when it is determined that a fault occurs in the refrigerant circulation of the air conditioner, that is, the air conditioner is in a defrosting fault state, the heating operation current and heating operation frequency can be used to further judge the fault situation of the air conditioner to determine whether an oil blockage fault occurs. Therefore, by comprehensively analyzing and judging the faults of the air conditioner based on the operation data of the air conditioner in the defrosting mode and the operation data in the heating mode, it is possible to accurately judge whether the air conditioner has an oil blockage fault.

[0030] Fourthly, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the communication detection method described in the first aspect embodiment above.

[0031] According to the computer-readable storage medium provided by the embodiment of the present invention, it has at least the following beneficial effects: when the defrosting operation duration reaches the defrosting abnormal duration, it can be considered that the air conditioner has a performance abnormality in the defrosting mode. Therefore, the defrosting operation current and defrosting exhaust temperature of the air conditioner in the defrosting mode can be used to make a preliminary fault judgment on the refrigerant circulation situation. Since the operation situations of the air conditioner during the process of switching from the defrosting mode to the heating mode are different when the air conditioner has an oil blockage fault or a refrigerant leakage fault, etc., the operation data (i.e., the heating operation current and heating operation frequency) of the air conditioner in the heating mode are different under different fault conditions. Thus, when it is determined that there is a fault in the refrigerant circulation of the air conditioner, that is, the air conditioner is in the defrosting fault state, the heating operation current and heating operation frequency can be used to further judge the fault situation of the air conditioner to determine whether an oil blockage fault has occurred. Therefore, by comprehensively analyzing and judging the faults of the air conditioner based on the operation data of the air conditioner in the defrosting mode and the operation data in the heating mode, it is possible to accurately judge whether the air conditioner has an oil blockage fault.

[0032] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solutions of the present invention and do not constitute a limitation to the technical solutions of the present invention.

[0034] The present invention will be further described below in conjunction with the drawings and embodiments;

[0035] Figure 1 is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention;

[0036] Figure 2 is a flowchart of an oil blockage fault detection method for an air conditioner provided by an embodiment of the present invention;

[0037] Figure 3 is Figure 2 a specific step diagram of step S400 shown;

[0038] Figure 4Yes Figure 3 Specific step diagram of step S420 shown

[0039] Figure 5 Yes Figure 3 Specific step diagram of another embodiment of step S420 shown

[0040] Figure 6 Yes Figure 1 Specific step diagram of step S200 shown

[0041] Figure 7 Yes Figure 6 Specific step diagram of step S210 shown

[0042] Figure 8 It is a schematic structural diagram of an operation control device provided by an embodiment of the present invention. Specific Embodiments

[0043] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be construed as a limitation on the protection scope of the present invention.

[0044] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present number, "at least one" means one or more, and "at least one of the following" and its similar expressions mean any combination of these items, including any combination of single items or plural items. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0045] It should be noted that words such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0046] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] In the description of the present invention, unless otherwise clearly defined, terms such as "setting", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0048] Currently, the air conditioner fault detection method can only detect insufficient performance of the air conditioner to judge that the air conditioner has an abnormal fault, and it is unable to accurately identify the difference between oil blockage and refrigerant leakage faults. Therefore, any one of the faults such as refrigerant leakage or oil blockage is usually used to replace the specific fault cause, resulting in the inability to quickly lock the true cause of the air conditioner failure and making it difficult to take appropriate measures for remedial treatment in a timely manner.

[0049] Based on this, the embodiments of the present invention provide an oil blockage fault detection method, a control device, an air conditioner and a medium for an air conditioner. When the defrosting operation duration reaches the abnormal defrosting duration, it can be considered that the air conditioner has abnormal performance in the defrosting mode. Therefore, the defrosting operation current and defrosting exhaust temperature of the air conditioner in the defrosting mode can be used to make a preliminary fault judgment on the refrigerant circulation situation. Since the operation conditions shown during the process of switching from the defrosting mode to the heating mode are different when the air conditioner has an oil blockage fault and other faults such as refrigerant leakage, the heating operation current and heating operation frequency of the air conditioner in the heating mode are different under different fault conditions. Thus, when it is determined that there is a fault in the refrigerant circulation of the air conditioner, that is, the air conditioner is in a defrosting fault state, the heating operation current and heating operation frequency of the air conditioner in the heating mode can be used to further judge the fault situation of the air conditioner to determine whether an oil blockage fault has occurred. Therefore, by comprehensively analyzing and judging the faults of the air conditioner based on the operation data of the air conditioner in the defrosting mode and the operation data in the heating mode, it is possible to accurately judge whether the air conditioner has an oil blockage fault.

[0050] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0051] Refer to Figure 1 , Figure 1It is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention. It can 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 the first end of the compressor 100 and the first end of the throttling element 300 through pipelines respectively, and the indoor heat exchanger 200 is connected to the second end of the compressor 100 and the second end of the throttling element 300 through pipelines respectively, and a refrigerant-lubricant refrigerant mixture flows in the pipelines. When the air conditioner operates in the heating mode, the high-temperature and high-pressure refrigerant mixture is transported from the compressor 100 to the indoor heat exchanger 200 for heat exchange. After heat exchange, the refrigerant mixture is transported to the outdoor heat exchanger 400 through the throttling element 300, and finally transported back to the compressor 100 from the outdoor heat exchanger 400. At this time, the indoor heat exchanger 200 plays a condensing role, liquefying and releasing heat the refrigerant flowing through the indoor heat exchanger 200. When the air conditioner operates in the heating mode for a long time, the outdoor heat exchanger 400 may frost. If the outdoor heat exchanger 400 cannot be defrosted in time, the heat exchange efficiency of the air conditioner may decrease. Therefore, after operating in the heating mode for a period of time, the air conditioner needs to operate in the defrosting mode to defrost the outdoor heat exchanger 400. When the air conditioner operates in the defrosting mode, the high-temperature and high-pressure refrigerant mixture is transported from the compressor 100 to the outdoor heat exchanger 400 for heat exchange. After heat exchange, the refrigerant mixture is transported to the indoor heat exchanger 200 through the throttling element 300, and finally transported back to the compressor 100 from the indoor heat exchanger 200. At this time, the outdoor heat exchanger 400 plays a condensing role, liquefying and releasing heat the refrigerant flowing through the indoor heat exchanger 200. When the air conditioner has faults such as refrigerant leakage and oil blockage, the amount of refrigerant flowing through the indoor heat exchanger 200 or the outdoor heat exchanger 400 per unit time decreases, resulting in a reduction in the heat exchange efficiency of the air conditioner. At the same time, it causes a change in the defrosting operating current of the air conditioner, reducing the defrosting performance of the air conditioner and prolonging the defrosting time. In addition, faults such as oil blockage and refrigerant leakage in the air conditioner will also change the load pressure of the compressor 100, causing a change in the exhaust temperature of the compressor 100, thereby affecting the performance of the air conditioner. Therefore, an exhaust temperature sensor for obtaining the exhaust temperature of the compressor 100 is also provided in the compressor 100, so that it is possible to judge whether the air conditioner has a fault through the exhaust temperature of the compressor 100. Because the changes in the exhaust temperature of the compressor 100 and the defrosting operating current of the air conditioner in the defrosting mode are different under different fault conditions, the defrosting operating current and the exhaust temperature of the compressor 100 of the air conditioner in the defrosting mode can be used to make a preliminary fault judgment on the refrigerant circulation situation, where the exhaust temperature of the compressor 100 is the defrosting exhaust temperature of the air conditioner in the defrosting mode.When the air conditioner has an oil blockage fault or a refrigerant leakage fault, the operating conditions during the process of switching from the defrost mode to the 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 occurring in the air conditioner can be analyzed and judged by comprehensively considering 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 is possible to accurately judge whether an oil blockage fault occurs in the pipeline and the throttling element 300 of the air conditioner.

[0052] It should be noted that when the air conditioner uses R290 refrigerant as the refrigerant, since the R290 refrigerant is flammable, the amount of R290 refrigerant filled in the air conditioner is less. If the operating conditions of the air conditioner change drastically, it will cause the lubricating oil to precipitate from the R290 refrigerant, and then block both ends of the throttling element 300, resulting in an oil blockage fault in the air conditioner.

[0053] Reference Figure 2 , Figure 2 is a flowchart of the oil blockage fault detection method for the air conditioner provided by the embodiment of the present invention. The flowchart of the oil blockage fault detection method for the air conditioner can be applied to an air conditioner as shown in Figure 1 The flowchart of the oil blockage fault detection method for the air conditioner includes but is not limited to the following steps:

[0054] Step S100, in the defrost mode, when the defrost operation duration of the air conditioner reaches the abnormal defrost duration, obtain the defrost operation current and defrost exhaust temperature of the air conditioner in the defrost mode;

[0055] Step S200, determine whether the air conditioner is in a defrost fault state according to the defrost operation current and the defrost exhaust temperature;

[0056] Step S300, when the air conditioner is in a defrost fault state, control the air conditioner to switch to the heating mode, and obtain the heating operation current and heating operation frequency of the air conditioner in the heating mode;

[0057] Step S400, determine whether the air conditioner has an oil blockage fault according to the heating operation current and the heating operation frequency.

[0058] It can be understood that since the operating conditions of the air conditioner are different when the air conditioner has performance abnormalities in the defrost mode, the defrost operation current and defrost exhaust temperature of the air conditioner in the defrost mode are different under different fault conditions. Therefore, the fault conditions of the air conditioner can be preliminarily judged by the defrost operation current and defrost exhaust temperature of the air conditioner in the defrost mode. For example, when the performance abnormality of the air conditioner is caused by abnormal refrigerant, the defrost operation current in the defrost mode will decrease, and the defrost exhaust temperature will increase.

[0059] It should be noted that the refrigerant abnormality can be further divided into an oil blockage fault condition and a refrigerant leakage fault. When the air conditioner has an oil blockage fault condition or a refrigerant leakage fault condition, the operating conditions during the process of switching from the defrost mode to the heating mode are different, resulting in differences in the heating operation current and heating operation frequency of the air conditioner in the heating mode under different fault conditions. Therefore, when it is determined that a fault has occurred in the refrigerant cycle of the air conditioner, the heating operation current and heating operation frequency can be used to further judge the fault condition of the air conditioner to determine whether an oil blockage fault has occurred. Compared with the related art, only judging the abnormality of the air conditioner based on insufficient performance of the air conditioner cannot accurately analyze the type of fault that has occurred in the air conditioner, that is, it cannot be determined whether an oil blockage fault has occurred in the air conditioner. However, the present invention analyzes and judges the fault that has occurred in the air conditioner by comprehensively considering the operating data of the air conditioner in the defrost mode and the operating data in the heating mode, and can accurately judge whether an oil blockage fault has occurred in the air conditioner.

[0060] It should be noted that the defrost operation duration is the operation duration when the defrost operation frequency of the air conditioner reaches the first preset frequency. The defrost operation frequency is the working frequency of the compressor 100 of the air conditioner in the current defrost mode, and the first preset frequency is the working frequency of the compressor 100 of the air conditioner under normal conditions. When a fault occurs in the air conditioner, it will cause the operation duration at the first preset frequency of the air conditioner to be extended. That is, in the defrost mode, if the defrost operation frequency is equal to the first preset frequency but the defrost operation duration is greater than the defrost abnormal duration, it can be considered that a fault has occurred in the air conditioner. In addition, in the defrost mode, if the defrost operation frequency is less than the first preset frequency, it can also be considered that a fault has occurred in the air conditioner.

[0061] It should be noted that the heating operation current and heating operation frequency can be obtained after a period of time when the mode is switched from the defrost mode to the heating mode, so as to avoid fluctuations in the heating operation current and heating operation frequency caused by the mode switch of the air conditioner, resulting in incorrect judgment.

[0062] It should be noted that the defrosting power can be calculated from the defrosting operating current and the input voltage of the air conditioner. When the input voltage of the air conditioner is constant, the defrosting operating current will change with the change of the defrosting power. Therefore, the defrosting power of the air conditioner can be judged by obtaining the defrosting operating current. If the defrosting operating power of the air conditioner is insufficient, it can be considered that the performance of the air conditioner is insufficient. In the defrosting mode, when there is an abnormal refrigerant circulation in the air conditioner and the refrigerant in the outdoor heat exchanger 400 cannot dissipate heat normally, the load on the compressor 100 will increase, which will further cause the exhaust temperature of the compressor 100 to change, that is, the defrosting exhaust temperature changes. Similarly, the heating power can be calculated from 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 performance of the air conditioner is insufficient due to oil blockage, when the air conditioner switches from the defrosting mode to the heating mode, the temperature of the refrigerant at the throttling element 300 and in the pipeline increases, resulting in a decrease in the viscosity of the lubricating oil, causing the lubricating oil to remix with the refrigerant, and the oil blockage phenomenon will disappear, and then the heating operating current and the heating operating frequency will return to normal. If the performance of the air conditioner is insufficient due to refrigerant leakage, when the air conditioner switches from the defrosting mode to the heating mode, the amount of refrigerant passing through the indoor heat exchanger 200 decreases, resulting in changes in the heating operating current and the heating operating frequency.

[0063] Reference Figure 3 , Figure 3 is Figure 2 The specific step diagram of step S400 shown, including but not limited to the following steps:

[0064] Step S410, obtaining a heating current detection result based on the heating operating current and a preset heating current threshold, and obtaining a heating frequency detection result based on the heating operating frequency and a preset heating frequency threshold;

[0065] Step S420, determining whether the air conditioner has an oil blockage fault according to the heating current detection result and the heating frequency detection result.

[0066] It can be understood that when the fault condition of the air conditioner is a refrigerant circulation fault, switch the air conditioner from the defrosting mode to the heating mode, and then obtain the heating operating current and the heating operating frequency of the air conditioner in the heating mode. Obtain a heating current detection result through the heating operating current and a preset heating current threshold, and obtain a heating operating frequency detection result through the heating operating frequency and a preset heating frequency threshold, and then comprehensively determine whether the air conditioner has an oil blockage fault based on the heating current detection result and the heating operating frequency detection result.

[0067] It can be understood that the preset heating current threshold can be the heating operation current under normal conditions of the air conditioner, and the preset heating frequency threshold can be the heating operation frequency threshold under normal conditions of the air conditioner. When an oil blockage fault occurs in the air conditioner, after the air conditioner switches from the defrosting mode to the heating mode, the heating operation current will return to normal. Therefore, it is possible to determine whether an oil blockage fault has occurred in the air conditioner by comparing the heating operation current with the preset heating current threshold, and the comparison result between the heating operation current and the preset heating current threshold is the heating current detection result. For example, if the comparison result between the heating operation current and the preset heating current threshold is that the heating operation current is greater than the preset heating current threshold, the heating current detection result is that an oil blockage fault has occurred in the air conditioner; when the comparison result between the heating operation current and the preset heating current threshold is that the heating operation current is less than the preset heating current threshold, the heating current detection result is that no oil blockage fault has occurred in the air conditioner. When an oil blockage fault occurs in the air conditioner, after the air conditioner switches from the defrosting mode to the heating mode, the heating operation frequency will return to normal. Therefore, it is possible to determine whether an oil blockage fault has occurred in the air conditioner by comparing the heating operation frequency with the preset heating star frequency threshold, and the comparison result between the heating operation current and the preset heating current threshold is the heating current detection result. For example, if the comparison result between the heating operation frequency and the preset heating frequency threshold is that the heating operation frequency is greater than the preset heating frequency threshold, the heating frequency detection result is that an oil blockage fault has occurred in the air conditioner; when the comparison result between the heating operation frequency and the preset heating frequency threshold is that the heating operation frequency is less than the preset heating frequency threshold, the heating frequency detection result is that no oil blockage fault has occurred in the air conditioner.

[0068] It should be noted that during the operation of the air conditioner, the heating operation current and the heating operation frequency may fluctuate. Therefore, the current ratio of the heating operation current to the preset heating current threshold can be calculated, and then the calculated current ratio is compared with the preset current ratio to determine the heating current detection result. By calculating the current ratio and the frequency ratio, the interference of the fluctuation of the operation parameters during the operation of the air conditioner can be reduced, and the accuracy of the detection result can be improved. For example, if the current ratio of the heating operation current to the preset heating current threshold is greater than the preset current ratio, the heating current detection result is that the air conditioner has an oil blockage fault; if the current ratio of the heating operation current to the preset heating current threshold is less than the preset current ratio, the heating current detection result is that the air conditioner does not have an oil blockage fault. Similarly, the frequency ratio of the heating operation frequency to the preset heating frequency threshold can be calculated, and then the calculated frequency ratio is compared with the preset frequency ratio to determine the heating current detection result. For example, if the frequency ratio of the heating operation frequency to the preset heating frequency threshold is greater than the preset frequency ratio, the heating frequency detection result is that the air conditioner has an oil blockage fault; if the frequency ratio of the heating operation frequency to the preset heating frequency threshold is less than the preset frequency ratio, the heating frequency detection result is that the air conditioner does not have an oil blockage fault. When both the heating frequency detection result and the heating current detection result are that the air conditioner has an oil blockage fault, it can be considered that the air conditioner has an oil blockage fault.

[0069] It can be understood that the heating operation current and the heating operation frequency at different times can be obtained and compared. The heating current detection result is determined according to the comparison result of the heating operation current and the preset heating current threshold, and the heating frequency detection result is determined according to the comparison result of the heating operation frequency and the preset heating operation frequency. The preset heating current threshold can be the heating operation current at the previous moment, and the preset heating frequency threshold can be the heating operation frequency threshold at the previous moment, that is, the heating operation current and the heating operation frequency at two time nodes before and after the heating mode are obtained. When the comparison result of the heating operation current and the preset heating current threshold is that the heating operation 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 operation current and the preset heating current threshold is that the heating operation current is less than the preset heating current threshold, the heating current detection result is that the air conditioner does not have an oil blockage fault. When the comparison result of the heating operation frequency and the preset heating frequency threshold is that the heating operation frequency is greater than the preset heating frequency threshold, the heating frequency detection result is that the air conditioner has an oil blockage fault; when the comparison result of the heating operation frequency and the preset heating frequency threshold is that the heating operation frequency is less than the preset heating frequency threshold, the heating frequency detection result is that the air conditioner does not have an oil blockage fault. When both the heating frequency detection result and the heating current detection result are that the air conditioner has an oil blockage fault, it can be considered that the air conditioner has an oil blockage fault.

[0070] Reference Figure 4, Figure 4 is Figure 3 a specific step diagram of step S420 shown, including but not limited to the following steps:

[0071] Step S421, when the heating current detection result meets the preset abnormal heating current condition and the heating frequency detection result meets the preset abnormal heating frequency condition, it is determined that the air conditioner has an oil blockage fault.

[0072] It can be understood that the fault condition of the air conditioner is a refrigerant circulation fault. When the heating current detection result meets the preset abnormal heating current condition and the heating frequency detection result both meet the preset abnormal heating frequency condition, the air conditioner is confirmed to have an oil blockage fault and gives an alarm prompt.

[0073] It should be noted that when the air conditioner has an oil blockage fault, after switching from the defrosting 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 normal heating performance of the air conditioner. 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 remixed with the refrigerant after the air conditioner switches from the defrosting mode to the heating mode, there may be insufficient mixing of the lubricating oil and the refrigerant, and the oil blockage fault may frequently occur in the subsequent working process. Therefore, even if the operation of the air conditioner has returned to normal, an alarm prompt still needs to be given to the user.

[0074] It should be noted that when an oil blockage fault occurs in the air conditioner and it is switched from the defrosting mode to the heating mode, the lubricating oil blocked at the throttling element 300 dissolves into the refrigerant as the temperature rises. At this time, the lubricating oil is not completely dissolved in the refrigerant, that is, there is still lubricating oil attached to the pipeline and the throttling element 300 of the air conditioner, but it does not affect the normal use of the air conditioner. However, due to the still-attached lubricating oil in the pipeline and the throttling element 300, the heating operation current of the air conditioner does not reach the preset heating current threshold and the heating operation frequency does not reach the preset heating operation frequency. Therefore, the abnormal heating current condition can be that the ratio of the heating operation 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 operation frequency to the preset heating frequency threshold is greater than the preset frequency ratio. It is equivalent to having a current fluctuation parameter related to the preset heating current threshold. By calculating the preset heating current threshold and the current fluctuation parameter, the current threshold range is obtained. When the heating operation current falls within the current threshold range, it can be considered that the heating operation current meets the abnormal heating current condition. Similarly, there is also 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 operation frequency falls within the frequency threshold range, it can be considered that the heating operation frequency meets the abnormal heating frequency condition.

[0075] It should be noted that the lubricating oil is not evenly dissolved in the refrigerant, which may cause fluctuations in the heating operation current and the heating operation frequency during the dissolution process of the lubricating oil. However, the change trend of the heating operation current and the change trend of the heating operation frequency are both upward trends. Therefore, the abnormal heating current condition can be that the current change trend in the previous unit time is less than the current change trend in the subsequent unit time, and the abnormal heating frequency condition can be that the detected result of the heating operation frequency is that the frequency change trend in the previous unit time is less than the frequency change trend in the subsequent unit time. That is, although the heating operation current fluctuates continuously, the heating operation circuit is always in an upward trend. Although the heating operation frequency fluctuates continuously, the heating operation frequency is always in an upward trend.

[0076] Refer to Figure 5 , Figure 5 is Figure 3 a specific step diagram of another embodiment of step S420 shown in the figure, including but not limited to the following steps:

[0077] Step S422, when the detected result of the heating current does not meet the preset abnormal heating current condition, or the detected result of the heating frequency does not meet the preset abnormal heating frequency condition, obtain the condenser outlet temperature of the air conditioner, and determine whether the air conditioner has an oil blockage fault according to the condenser outlet temperature and the preset condensation temperature threshold.

[0078] It can be understood that when the heating mode is switched to the defrosting mode, due to the changes in pressure and temperature at both ends of the throttling element 300, the viscosity of the lubricating oil decreases, which then blocks both ends of the throttling element 300. Moreover, after switching from the defrosting mode to the heating mode, the lubricating oil blocked at the throttling element 300 does not dissolve into the refrigerant with the rise in temperature, which will lead to a decrease in the flow rate of the refrigerant in the pipeline, and further cause insufficient heating power of the air conditioner. When the heating power of the air conditioner is insufficient, it will lead to the situation that the detected heating current does not meet the preset abnormal heating current condition, or the detected heating frequency does not meet the preset abnormal heating frequency condition. When the flow rate of the refrigerant in the pipeline decreases, the refrigerant cannot release heat sufficiently in the indoor heat exchanger 200, resulting in a decrease in the outlet temperature of the indoor heat exchanger 200, that is, the outlet temperature of the condenser decreases. Therefore, it is possible to determine whether the throttling element 300 of the air conditioner is oil-blocked according to the outlet temperature of the condenser and the preset condenser temperature threshold.

[0079] It should be noted that the preset condenser temperature threshold can be the outlet temperature of the condenser in the normal heating mode. By judging whether the outlet temperature is greater than the preset condenser temperature threshold, the oil-blocking fault of the air conditioner can be judged. When the outlet temperature of the condenser is less than the preset condenser temperature threshold, it can be determined that the air conditioner has an oil-blocking fault. When the outlet temperature is greater than the preset condenser temperature threshold, the air conditioner will also perform self-check to confirm the fault condition of the air conditioner.

[0080] It should be noted that the outlet temperature of the condenser can be obtained after a period of time when the defrosting mode is switched to the heating mode, so as to avoid misjudgment caused by the fluctuation of the outlet temperature of the condenser due to the mode switch of the air conditioner.

[0081] Referring to Figure 6 , Figure 6 is Figure 1 the specific step diagram of step S200 shown, including but not limited to the following steps:

[0082] Step S210, determine whether the air conditioner is in a fault state according to the current change trend of the defrosting running current and the temperature change trend of the defrosting exhaust temperature.

[0083] It can be understood that in the defrosting mode, when the refrigerant flow rate or velocity in the air conditioner pipeline decreases, the defrosting performance of the air conditioner will also decrease, and the defrosting performance of the air conditioner is related to the defrosting operating current. That is, in the defrosting mode, when a refrigerant circulation failure occurs in the air conditioner, the defrosting operating current of the air conditioner will change with the change of the defrosting performance. The change of the defrosting operating current may be a fluctuating change, but the current change trend of the defrosting operating current remains unchanged. Since the air conditioner may experience changes in its operating frequency, operating current, exhaust temperature, etc. due to wear of electrical components during long-term use. For example, both the operating frequency and the operating current cannot reach the standard threshold. If the operating frequency, operating current, and exhaust temperature are respectively compared with the corresponding standard thresholds to determine whether the air conditioner has an oil blockage fault, it is likely to be affected by equipment aging and interfere with the accuracy of the judgment result. Therefore, using the change trend of the operating parameters of the air conditioner to judge whether the air conditioner has an oil blockage fault can weaken the influence of parameter errors and improve the accuracy of fault detection.

[0084] It can be understood that in the defrosting mode, when the refrigerant flow rate or velocity 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, and then cause a change in the exhaust temperature of the compressor 100, that is, the defrosting exhaust temperature changes. The change of the defrosting exhaust temperature may be a fluctuating change, but the temperature change trend of the defrosting exhaust temperature remains unchanged. Therefore, it is possible to judge whether the air conditioner is in a fault state according to the current change trend of the defrosting operating current and the temperature change trend of the defrosting exhaust temperature.

[0085] Specifically, the current change trend of the defrosting operating current can be calculated by obtaining multiple defrosting operating currents within a certain time period. When the multiple defrosting operating currents within a certain time period are continuously increasing, it can be considered that the current change trend is an upward trend. When the multiple defrosting operating currents within a certain time period are continuously decreasing, it can be considered that the current change trend is a downward trend. In addition, when the decreasing amplitude of the multiple defrosting operating currents within a certain time period is less than the increasing amplitude of the multiple defrosting operating currents, it can also be considered that the current change trend is an upward trend. When the decreasing amplitude of the multiple defrosting operating currents within a certain time period is greater than the increasing amplitude of the multiple defrosting operating currents, it can be considered that the current change trend is a downward trend. Similarly, the temperature change trend of the defrosting exhaust temperature can be calculated by obtaining multiple defrosting exhaust temperatures within a certain time period. When the multiple defrosting exhaust temperatures within a certain time period are continuously increasing, it can be considered that the temperature change trend is an upward trend. When the multiple defrosting exhaust temperatures within a certain time period are continuously decreasing, it can be considered that the temperature change trend is a downward trend. In addition, when the decreasing amplitude of the multiple defrosting exhaust temperatures within a certain time period is less than the increasing amplitude of the multiple defrosting exhaust temperatures, it can also be considered that the temperature change trend is an upward trend. When the decreasing amplitude of the multiple defrosting exhaust temperatures within a certain time period is greater than the increasing amplitude of the multiple defrosting exhaust temperatures, it can be considered that the temperature change trend is a downward trend.

[0086] Referring to Figure 7 , Figure 7 is Figure 6 the specific step diagram of step S210 shown in the figure, including but not limited to the following steps:

[0087] Step S211, when the current change trend of the defrosting operating current meets the preset defrosting current abnormal condition, and the temperature change trend of the defrosting exhaust temperature meets the preset defrosting exhaust abnormal condition, it is determined that the air conditioner is in a fault state.

[0088] It can be understood that when the air conditioner is in the defrosting mode, when the current change trend of the defrosting operating current meets the preset defrosting current abnormal condition and the temperature change trend of the defrosting exhaust temperature meets the preset defrosting exhaust abnormal condition, it can be determined that the air conditioner is in a refrigerant cycle fault.

[0089] It should be noted that the defrosting power can be calculated from the defrosting operating current and the input voltage of the air conditioner. When the input voltage of the air conditioner is constant, a decrease in the defrosting operating current will cause a decrease in the defrosting power, and an increase in the defrosting operating current will cause an increase in the defrosting power. The defrosting power of the air conditioner characterizes the defrosting performance of the air conditioner. In the defrosting mode, when the refrigerant flow rate or velocity in the air conditioner pipeline decreases, the refrigerant flowing through the outdoor heat exchanger 400 cannot dissipate heat normally, which increases the load on the compressor 100 and causes the exhaust temperature of the compressor 100 to rise. Therefore, the preset abnormal defrosting current condition can be that the current change trend of the defrosting operating current is a downward trend, and the preset abnormal defrosting exhaust condition is that the temperature change trend of the defrosting exhaust temperature is an upward trend. That is, when the defrosting performance of the air conditioner decreases and the exhaust temperature of the compressor 100 rises, it can be considered that the air conditioner is in a refrigerant circulation failure.

[0090] It should be noted that in the defrosting mode, if the air conditioner does not malfunction, the defrosting operating current of the air conditioner may also fluctuate, but the defrosting operating current of the air conditioner is always greater than the minimum defrosting current of the air conditioner under normal conditions. Therefore, the abnormal defrosting current condition can also be that the current change trend is a downward trend and the defrosting operating current is less than the preset defrosting current threshold, where the preset defrosting current threshold is the minimum defrosting current of the air conditioner under normal conditions. This can avoid misjudgment when the air conditioner is working normally but the change trend of the defrosting operating current is a downward trend.

[0091] It can be understood that in the defrosting mode, if the air conditioner has a refrigerant circulation failure, the defrosting operating current of the air conditioner is always greater than the minimum defrosting current of the air conditioner under normal conditions. In the defrosting mode, when the air conditioner has a refrigerant circulation failure, the defrosting performance of the air conditioner will continue to decline, that is, the defrosting operating current will continue to decrease. Therefore, it is possible to compare the defrosting operating currents at different times to determine whether the defrosting performance of the air conditioner is decreasing. In the defrosting mode, when the refrigerant flow rate or velocity in the air conditioner pipeline decreases, the refrigerant flowing through the outdoor heat exchanger 400 cannot dissipate heat normally, which increases the load on the compressor 100 and causes the exhaust temperature of the compressor 100 to rise continuously. That is, it is possible to compare the defrosting exhaust temperatures at different times to determine whether the load on the compressor 100 is increasing. Therefore, the abnormal defrosting current condition can be that the defrosting operating current is less than the preset defrosting current threshold and the defrosting operating current is less than the defrosting operating current at the previous moment, and the abnormal defrosting exhaust condition is that the defrosting exhaust temperature is higher than the defrosting exhaust temperature at the previous moment.

[0092] Second aspect, referring to Figure 8, an embodiment of the present invention 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 of the air conditioner in the first aspect embodiment above, for example, execute Figure 2 method steps S100 to S400 in Figure 3 method steps S410 to S420 in Figure 4 method step S421 in Figure 5 method step S422 in Figure 6 method step S210 in Figure 7 and method step S211 in

[0093] The 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 oil blockage fault detection method of the air conditioner in the above embodiments of the present invention. The processor 820 realizes the oil blockage fault detection method of the air conditioner in the above embodiments of the present invention by running the non-transitory software programs and instructions stored in the memory 810.

[0094] The memory 810 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data required for executing the oil blockage fault detection method of the air conditioner in the above embodiments. In addition, the memory 810 may include a high-speed random access memory 810, and may also include a non-transitory memory 810, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. It should be noted that the memory 810 may optionally include a memory 810 remotely provided relative to the processor 820, and these remote memories 810 can be connected to the terminal through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0095] Thirdly, an embodiment of the present invention provides an air conditioner, which includes an operation control device 800 as described in the embodiment of the second aspect. When the air conditioner uses R290 refrigerant as the refrigerant, since the R290 refrigerant is flammable, the amount of R290 refrigerant filled in the air conditioner is less. If the working condition of the air conditioner changes drastically, it will cause the lubricating oil to precipitate from the R290 refrigerant, and then block both ends of the throttling element, resulting in an oil blockage fault of the air conditioner. When the defrosting operation duration reaches the abnormal defrosting duration, it can be considered that the air conditioner has abnormal performance in the defrosting mode. Therefore, the defrosting operation current and defrosting exhaust temperature of the air conditioner in the defrosting mode can be used to make a preliminary fault judgment on the refrigerant cycle. Since the operating conditions of the air conditioner are different when an oil blockage fault occurs and when a refrigerant leakage fault occurs, etc., the operating data of the air conditioner in the heating mode are different under different fault conditions, that is, the heating operation current and the heating operation frequency are different. Therefore, when it is determined that a fault occurs in the refrigerant cycle of the air conditioner, that is, the air conditioner is in a defrosting fault state, the heating operation current and the heating operation frequency can be used to further judge the fault conditions of the air conditioner to determine whether an oil blockage fault occurs. Therefore, by comprehensively analyzing and judging the faults of the air conditioner based on the operating data of the air conditioner in the defrosting mode and the heating mode, it is possible to accurately judge whether the air conditioner has an oil blockage fault.

[0096] Fourthly, an embodiment of the present invention provides a computer-readable storage medium, which stores computer-executable instructions for causing a computer to execute the oil blockage fault detection method of the air conditioner as described in the embodiment of the first aspect above, for example, to execute Figure 2 the method steps S100 to S400 in Figure 3 the method steps S410 to S420 in Figure 4 the method step S421 in Figure 5 the method step S422 in Figure 6 the method step S210 in Figure 7 and the method step S211 in

[0097] Those of ordinary skill in the art will appreciate that all or some of the steps and systems 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 a computer-readable medium, which can include a computer storage medium or a non-transitory medium and a communication medium or a transitory medium. As is well known to those of ordinary skill in the art, the term computer storage medium 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 technologies, CD-ROM, digital versatile disk (DVD) 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 the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery media.

[0098] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. An oil blockage fault detection method for an air conditioner, characterized in that, it includes: In the defrosting mode, when the defrosting operation duration of the air conditioner reaches the abnormal defrosting duration, obtain the defrosting operation current and the defrosting exhaust temperature of the air conditioner in the defrosting mode; The defrosting operation duration is the operation duration when the defrosting operation frequency of the air conditioner reaches the first preset frequency; Determine whether the air conditioner is in a defrosting fault state according to the defrosting operation current and the defrosting exhaust temperature; When the air conditioner is in a defrosting fault state, control the air conditioner to switch to the heating mode, and obtain the heating operation current and the heating operation frequency of the air conditioner in the heating mode; Determine whether the air conditioner has an oil blockage fault according to the heating operation current and the heating operation frequency.

2. The oil blockage fault detection method according to claim 1, characterized in that, The determining whether the air conditioner has an oil blockage fault according to the heating operation current and the heating operation frequency includes: Obtain a heating current detection result according to the heating operation current and a preset heating current threshold, and obtain a heating frequency detection result according to the heating operation frequency and a preset heating frequency threshold; Determine whether the air conditioner has an oil blockage fault according to the heating current detection result and the heating frequency detection result.

3. The oil blockage fault detection method according to claim 2, characterized in that, 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 abnormal condition and the heating frequency detection result meets the preset heating frequency abnormal condition, determine that the air conditioner has an oil blockage fault.

4. The oil blockage fault detection method according to claim 2, characterized in that, 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, obtain the condenser outlet temperature of the air conditioner, and determine whether the air conditioner has an oil blockage fault according to the condenser outlet temperature and a preset condensation temperature threshold.

5. The oil blockage fault detection method according to claim 4, characterized in that, The determining whether the air conditioner has an oil blockage fault according to the condenser outlet temperature and a preset condensation temperature threshold includes: When the condenser outlet temperature is less than the preset condensation temperature threshold, determine that the air conditioner has an oil blockage fault.

6. The oil blockage fault detection method according to claim 3 or 4, characterized in that, The heating current abnormal condition is that the heating operation current is greater than or equal to the preset heating current threshold: the heating frequency abnormal condition is that the heating operation frequency is greater than the preset heating frequency threshold.

7. The oil blockage fault detection method according to claim 1, characterized in that, The determining whether the air conditioner is in a defrosting fault state according to the defrosting operation current and the defrosting exhaust temperature includes: Determine whether the air conditioner is in a fault state according to the current change trend of the defrosting operating current and the temperature change trend of the defrosting 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 change trend of the defrosting operating current and the temperature change trend of the defrosting exhaust temperature includes; when the current change trend of the defrosting operating current meets the preset defrosting current abnormal condition, and the temperature change trend of the defrosting exhaust temperature meets the preset defrosting exhaust abnormal condition, determine that the air conditioner is in a fault state.

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

10. An operation control device, wherein, it includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the oil blockage fault detection method of the air conditioner according to any one of claims 1 to 9.

11. An air conditioner, wherein, it includes the operation control device according to claim 10.

12. A computer-readable storage medium, wherein, the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the oil blockage fault detection method of the air conditioner according to any one of claims 1 to 9.

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