Control method and control device of air conditioner, air conditioner and medium

Abstract

The invention discloses a control method and device of an air conditioner, the air conditioner and a medium, and the control method of the air conditioner comprises the steps that when the air conditioner is switched from a heating mode to a defrosting mode, the operation frequency and the operation duration of the air conditioner in the heating mode are obtained; and according to the operation frequency and the operation duration, the opening degree of an electronic expansion valve of the air conditioner in the defrosting mode is controlled. According to the air conditioner control method, the oil blockage fault of the air conditioner can be effectively restrained, and the operation reliability of the air conditioner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control 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 used to increase the refrigerating capacity. At the same time, due to its flammability, the filling 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 - 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, and in severe cases, blocking the throttling element, causing an oil blockage phenomenon, which affects the normal operation performance of the air conditioner. Therefore, how to effectively suppress the oil blockage fault of the air conditioner has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of the present invention is to at least solve one of the technical problems existing in the prior art, and provide a control method, a control device, an air conditioner and a medium for an air conditioner, which can effectively suppress the oil blockage fault of the air conditioner and improve the reliability of the operation of the air conditioner.

[0004] In a first aspect, an embodiment of the present invention provides a control method for an air conditioner, including:

[0005] When the air conditioner switches from the heating mode to the defrosting mode, obtain the operating frequency and the operating duration of the air conditioner in the heating mode;

[0006] According to the operating frequency and the operating duration, control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode.

[0007] The control method of an air conditioner provided by an embodiment of the present invention has at least the following beneficial effects: The refrigerant circulation speed and refrigerant pressure corresponding to different operating frequencies of the air conditioner are different, which in turn leads to different viscosities of the lubricating oil. And high-viscosity lubricating oil will adhere to the electronic expansion valve, which in turn causes an oil blockage fault in the air conditioner. At the same time, as the operating time of the air conditioner increases, the lubricating oil separated from the refrigerant will continuously adhere to the electronic expansion valve, thereby forming oil coagulation flocs, increasing the risk of the air conditioner having an oil blockage fault. In addition, when the air conditioner switches from the heating mode to the defrosting mode, the operating conditions at both ends of the electronic expansion valve will change violently, which may exacerbate the change in the viscosity of the lubricating oil, thereby increasing the risk of the air conditioner having an oil blockage fault. Therefore, according to the operating frequency and operating duration of the air conditioner in the heating mode, the risk of the air conditioner having an oil blockage fault is judged in advance, and then the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode is controlled, which can quickly suppress the air conditioner from having an oil blockage fault.

[0008] According to the control method of an air conditioner provided by some embodiments of the present invention, the controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the operating frequency and the operating duration includes:

[0009] Determine an oil blockage detection result according to the operating frequency and the operating duration, and the oil blockage detection result is used to represent the possibility of the air conditioner having an oil blockage fault;

[0010] Control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the oil blockage detection result.

[0011] According to the control method of an air conditioner provided by some embodiments of the present invention, the controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the oil blockage detection result includes:

[0012] When the oil blockage detection result meets the oil blockage risk condition, control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode to the maximum opening degree;

[0013] Or,

[0014] When the oil blockage detection result does not meet the oil blockage risk condition, control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the operating frequency and the operating duration.

[0015] According to the control method of an air conditioner provided by some embodiments of the present invention, 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.

[0016] A control method for an air conditioner provided according to some embodiments of the present invention, which controls the opening degree of an electronic expansion valve of the air conditioner in a defrosting mode according to the operating frequency and the operating duration, includes:

[0017] Determine a target opening degree according to the operating duration and the frequency difference between the operating frequency and a second preset frequency threshold;

[0018] Control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode to be the target opening degree.

[0019] A control method for an air conditioner provided according to some embodiments of the present invention, wherein determining the target opening degree according to the operating duration and the second frequency difference between the operating frequency and a second preset frequency threshold includes:

[0020] Obtain an opening degree adjustment parameter, perform a product calculation on the reciprocal of the operating duration, the opening degree adjustment parameter, and the frequency difference between the operating frequency and the second preset frequency threshold to obtain an adjustment amplitude;

[0021] Obtain the target opening degree by subtracting the adjustment amplitude from the maximum opening degree of the electronic expansion valve of the air conditioner.

[0022] A control method for an air conditioner provided according to some embodiments of the present invention, wherein controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode to be the target opening degree includes:

[0023] Obtain an opening degree 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 a second preset duration threshold;

[0024] In the control method for an air conditioner provided according to some embodiments of the present invention, the operating duration is the cumulative operating duration of the air conditioner operating at an operating frequency lower than a preset frequency threshold in the heating mode.

[0025] In the control method for an air conditioner provided according to some embodiments of the present invention, the operating frequency is the operating frequency of the air conditioner within a time period before ending the heating mode.

[0026] In a second aspect, an embodiment of the present invention provides an operation control device, including 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 control method for the 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: The refrigerant circulation speed and refrigerant pressure corresponding to different air conditioner operation frequencies are different, which in turn leads to different viscosities of the lubricating oil. High-viscosity lubricating oil will adhere to the electronic expansion valve, resulting in an oil blockage fault in the air conditioner. At the same time, as the working time of the air conditioner increases, the lubricating oil separated from the refrigerant will continuously adhere to the electronic expansion valve, forming oil coagulation flocs, increasing the risk of an oil blockage fault in the air conditioner. In addition, when the air conditioner switches from the heating mode to the defrosting mode, the operating conditions at both ends of the electronic expansion valve will change drastically, which may exacerbate the change in the viscosity of the lubricating oil, further increasing the risk of an oil blockage fault in the air conditioner. Therefore, by judging the risk of an oil blockage fault in the air conditioner in advance according to the operation frequency and operation duration of the air conditioner in the heating mode, and then controlling the opening of the electronic expansion valve of the air conditioner in the defrosting mode, the occurrence of an oil blockage fault in the air conditioner can be quickly suppressed.

[0028] In a third aspect, an embodiment of the present invention provides an air conditioner, including 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: The refrigerant circulation speed and refrigerant pressure corresponding to different air conditioner operation frequencies are different, which in turn leads to different viscosities of the lubricating oil. High-viscosity lubricating oil will adhere to the electronic expansion valve, resulting in an oil blockage fault in the air conditioner. At the same time, as the working time of the air conditioner increases, the lubricating oil separated from the refrigerant will continuously adhere to the electronic expansion valve, forming oil coagulation flocs, increasing the risk of an oil blockage fault in the air conditioner. In addition, when the air conditioner switches from the heating mode to the defrosting mode, the operating conditions at both ends of the electronic expansion valve will change drastically, which may exacerbate the change in the viscosity of the lubricating oil, further increasing the risk of an oil blockage fault in the air conditioner. Therefore, by judging the risk of an oil blockage fault in the air conditioner in advance according to the operation frequency and operation duration of the air conditioner in the heating mode, and then controlling the opening of the electronic expansion valve of the air conditioner in the defrosting mode, the occurrence of an oil blockage fault in the air conditioner can be quickly suppressed.

[0030] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores 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 embodiments of the present invention, it has at least the following beneficial effects: When the operating frequency of the air conditioner is different, the refrigerant circulation speed and refrigerant pressure in the air conditioner pipeline will also change, which will in turn cause the viscosity of the lubricating oil to change. When the air conditioner switches from the heating mode to the defrosting mode, the drastic change in the operating conditions at both ends of the electronic expansion valve may exacerbate the change in the viscosity of the lubricating oil, and it is easy to cause the lubricating oil to block in the electronic expansion valve, that is, the oil blockage fault. During the refrigerant circulation process, the refrigerant will continuously release the oil coagulation flocs of the lubricating oil over time, and the oil coagulation flocs will accumulate in the electronic expansion valve, thereby increasing the risk of the electronic expansion valve having an oil blockage fault. In the defrosting mode, by controlling the opening degree of the electronic expansion valve, the occurrence of an oil blockage fault can be avoided or the degree of oil blockage can be reduced. Therefore, according to the operating frequency and operating duration of the air conditioner in the heating mode, controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode can effectively suppress the occurrence of an oil blockage fault in the air conditioner and improve the reliability of the air conditioner operation.

[0032] Other features and advantages of the present invention will be described in the following description, and, in part, will be obvious from the description, 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 description, the claims, and the 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 description. They are used together with the embodiments of the present invention 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 a control method of an air conditioner provided by an embodiment of the present invention;

[0037] Figure 3 is Figure 2 a specific step diagram of the shown step S200;

[0038] Figure 4 is Figure 3 a specific step diagram of the shown step S220;

[0039] Figure 5 is Figure 3 a specific step diagram of another embodiment of the shown step S420;

[0040] Figure 6 is Figure 5The specific step diagram of step S230 shown;

[0041] Figure 7 is Figure 5 The specific step diagram of step S240 shown;

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

[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 role of the drawings is to supplement the description in 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 cannot be understood 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 two or more, 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 refer to 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, words such as setting, installing, and connecting should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0048] At present, related technologies use refrigerants with relatively low refrigerating capacity per unit volume as the refrigerant of air conditioners, and then use large-displacement compressors to increase the refrigerating capacity. However, due to the flammability of the refrigerant, the refrigerant charge is extremely low. During the heating-defrosting conversion process of the air conditioner under low-temperature heating conditions, when the refrigerant / lubricating oil mixture passes through the throttling element, the pressure drops suddenly, resulting in changes in the solubility and viscosity of the lubricating oil. In severe cases, the throttling element is blocked, causing an oil blockage phenomenon, which affects the normal operating performance of the air conditioner.

[0049] Based on this, the present invention provides a control method, a control device, an air conditioner and a medium for an air conditioner. The refrigerant circulation speed and refrigerant pressure corresponding to different operating frequencies of the air conditioner are different, which in turn leads to different viscosities of the lubricating oil. And high-viscosity lubricating oil will adhere to the electronic expansion valve, which in turn causes an oil blockage fault in the air conditioner. At the same time, as the working time of the air conditioner increases, the lubricating oil separated from the refrigerant will continuously adhere to the electronic expansion valve, thereby forming oil coagulation flocs, increasing the risk of the air conditioner having an oil blockage fault.

[0050] In addition, when the air conditioner switches from the heating mode to the defrosting mode, the operating conditions at both ends of the electronic expansion valve will change drastically, which may exacerbate the change in the viscosity of the lubricating oil, thereby increasing the risk of the air conditioner having an oil blockage fault. Therefore, according to the operating frequency and operating duration of the air conditioner in the heating mode, the risk of the air conditioner having an oil blockage fault is judged in advance, and then the opening of the electronic expansion valve in the defrosting mode is controlled, which can quickly suppress the air conditioner from having an oil blockage fault.

[0051] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0052] Refer to Figure 1 , Figure 1 which is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention.

[0053] It can be understood that the air conditioner includes a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 400, and an electronic expansion valve 300. The outdoor heat exchanger 400 is connected to the first end of the compressor 100 and the first end of the electronic expansion valve 300 through pipelines respectively. The indoor heat exchanger 200 is connected to the second end of the compressor 100 and the second end of the electronic expansion valve 300 through pipelines respectively. The refrigerant mixture of the refrigerant and the lubricating oil flows in the pipelines. An opening controller for controlling the opening of the electronic expansion valve 300 is also provided inside the electronic expansion valve 300. 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 electronic expansion valve 300, and finally transported back to the compressor 100 from the outdoor heat exchanger 400.

[0054] Specifically, when the air conditioner operates in the heating mode at a low operating frequency, the speed of the refrigerant circulation decreases, resulting in a slowdown in the lubricating oil circulation speed within the compressor 100. Consequently, the residence time of the lubricating oil within the compressor 100 is prolonged, that is, the residence time of the lubricating oil in the high-temperature environment within the compressor 100 is also correspondingly prolonged. The lubricating oil is prone to oxidation in a high-temperature environment, generating acidic substances. These acidic substances will promote the degradation of the lubricating oil, leading to an increase in the viscosity of the lubricating oil. When the viscosity of the lubricating oil increases, it may cause the lubricating oil to adhere within the electronic expansion valve 300, thereby increasing the risk of oil blockage failure in the air conditioner. Meanwhile, as the operating time of the air conditioner increases, the lubricating oil separated from the refrigerant will continuously adhere to both ends of the electronic expansion valve 300, thereby forming oil coagulation flocs, which will also increase the risk of oil blockage failure in the air conditioner. When the air conditioner switches from the heating mode to the defrosting mode, the direction of the refrigerant circulation changes. 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 passes through the electronic expansion valve 300 and then is transported to the indoor heat exchanger 200, and finally is transported back to the compressor 100 from the indoor heat exchanger 200, which will cause a drastic change in the operating conditions at both ends of the electronic expansion valve 300, may exacerbate the change in the viscosity of the lubricating oil, and increase the risk of oil blockage failure in the air conditioner. By changing the opening degree of the electronic expansion valve 300, the pressure at both ends of the electronic expansion valve 300 can be changed, thereby reducing the risk of oil blockage failure in the air conditioner.

[0055] Therefore, based on the operating frequency and operating duration of the air conditioner in the heating mode, the risk of oil blockage failure in the air conditioner can be judged, and then by controlling the opening degree of the electronic expansion valve 300 of the air conditioner in the defrosting mode, the occurrence of oil blockage failure in the air conditioner can be inhibited.

[0056] It should be noted that when the air conditioner uses R290 refrigerant as the refrigerant, due to the flammability of the R290 refrigerant, 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 separate from the R290 refrigerant, thereby increasing the risk of oil blockage failure in the air conditioner.

[0057] Reference Figure 2 , Figure 2 is the flowchart of the control method of the air conditioner provided by the embodiment of the present invention. The flowchart of the control method of the air conditioner can be applied to the air conditioner as shown in Figure 1 The flowchart of the control method of the air conditioner includes but is not limited to the following steps:

[0058] Step S100, when the air conditioner switches from the heating mode to the defrosting mode, obtain the operating frequency and operating duration of the air conditioner in the heating mode;

[0059] Step S200: Control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the operating frequency and the operating duration.

[0060] It can be understood that in the heating mode, the refrigerant circulation speed and the refrigerant pressure corresponding to different operating frequencies are different, and the lubricating oil viscosities corresponding to different refrigerant circulation speeds and refrigerant pressures are also different. For example, the lower the operating frequency, the lower the refrigerant circulation speed and the refrigerant pressure, and thus the higher the viscosity of the lubricating oil. That is, the decrease in the operating frequency will cause the viscosity of the lubricating oil to increase. The high-viscosity lubricating oil will adhere to the pipeline or the electronic expansion valve 300 during the refrigerant circulation, increasing the risk of oil blockage failure of the air conditioner. At the same time, the refrigerant in the air conditioner may precipitate lubricating oil during the flowing process, and over time, the lubricating oil precipitated from the refrigerant will continuously adhere to the electronic expansion valve 300, thereby forming oil coagulation flocs and increasing the risk of oil blockage failure of the air conditioner. Therefore, by obtaining the operating frequency and the operating duration of the air conditioner in the heating mode, the oil blockage risk of the air conditioner is pre-evaluated, so that when the air conditioner switches from the heating mode to the defrosting mode, the opening degree of the electronic expansion valve 300 in the defrosting mode can be controlled simultaneously, and the risk of oil blockage failure of the air conditioner is reduced by changing the opening degree of the electronic expansion valve 300. Compared with the solution in the related art that determines the oil blockage degree of the electronic expansion valve 300 by obtaining the operating parameters in real time when the air conditioner operates in the defrosting mode and then adjusts the opening degree of the electronic expansion valve 300, the embodiment of the present invention predicts and evaluates the oil blockage failure risk of the air conditioner through the operating parameters of the air conditioner in the heating mode before switching to the defrosting mode, and when the air conditioner switches to the defrosting mode, the opening degree of the electronic expansion valve 300 of the air conditioner is controlled simultaneously, which can save the detection duration of obtaining the operating parameters to judge the risk of oil blockage failure after the air conditioner is controlled to switch to the defrosting mode, thereby reducing the failure duration of oil blockage and being able to quickly and effectively reduce the risk of oil blockage failure.

[0061] It should be noted that the larger the opening degree of the electronic expansion valve 300, the smaller the relative pressure difference of the refrigerant at both ends of the electronic expansion valve 300, and the decrease in the pressure difference of the refrigerant at both ends of the electronic expansion valve 300 will affect the working efficiency of the air conditioner. That is, when the air conditioner operates in the defrosting mode, the larger the opening degree of the electronic expansion valve 300, the lower the defrosting efficiency of the air conditioner; when the air conditioner operates in the heating mode, the larger the opening degree of the electronic expansion valve 300, the lower the heating efficiency of the air conditioner. Therefore, when the air conditioner is in the heating mode, the opening degree of the electronic expansion valve is maintained, and after switching to the defrosting mode, the opening degree of the electronic expansion valve 300 is adjusted, that is, only the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode is adjusted, so as to avoid adjusting the electronic expansion valve 300 in the heating mode, resulting in a decrease in the heating efficiency of the air conditioner, which is equivalent to sacrificing the defrosting efficiency of the air conditioner, and giving priority to ensuring the heating efficiency of the air conditioner while ensuring that the risk of oil blockage failure can be effectively reduced.

[0062] It should be noted that the opening degree 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, so as to reduce the risk of oil blockage failure of the air conditioner in the heating mode.

[0063] It should be noted that the longer the operation time of the air conditioner in the heating mode, the more oil condensate can be considered to accumulate in the electronic expansion valve 300, and the greater the risk of oil blockage failure of the air conditioner. The lower the operation frequency of the air conditioner in the heating mode, the higher the viscosity of the lubricating oil can be considered, and the greater the risk of oil blockage failure of the air conditioner. Therefore, the opening degree of the electronic expansion valve 300 in the defrosting mode of the air conditioner can be directly controlled according to the operation frequency and operation time in the heating mode. For example, when the operation frequency is lower, the opening degree of the electronic expansion valve 300 in the defrosting mode can be controlled to be larger; and when the operation time is longer, the opening degree of the electronic expansion valve 300 in the defrosting mode can be controlled to be larger.

[0064] It should be noted that the operation frequency and operation time of the air conditioner in the heating mode can also be input into a preset air conditioner oil blockage failure model for risk prediction, and then the opening degree of the electronic expansion valve 300 in the defrosting mode can be adjusted according to the output risk prediction result. By predicting the oil blockage failure risk of the air conditioner through the air conditioner oil blockage failure model, the accuracy of risk prediction can be effectively improved. The risk prediction result is the magnitude of the comprehensive oil blockage risk of the air conditioner. The greater the comprehensive oil blockage risk, the larger the opening degree of the electronic expansion valve 300.

[0065] It should be noted that the oil blockage risks corresponding to the operation frequency and operation time of the air conditioner in the heating mode may be different, and the opening degrees of the electronic expansion valve in the defrosting mode corresponding to different oil blockage risks are also different. Therefore, the opening degree of the electronic expansion valve 300 in the defrosting mode can also be calculated respectively according to the operation frequency and operation time of the air conditioner in the heating mode, and then the opening degree of the electronic expansion valve 300 in the defrosting mode can be adjusted according to the calculation result. For example, the opening degree of the electronic expansion valve 300 in the defrosting mode calculated according to the operation frequency in the heating mode is the first opening degree, and the opening degree of the electronic expansion valve 300 in the defrosting mode calculated according to the operation time in the heating mode is the second opening degree. Then, the larger of the first opening degree and the second opening degree is selected as the target opening degree to adjust the opening degree of the electronic expansion valve 300 in the defrosting mode, so as to more effectively suppress the risk of oil blockage failure of the air conditioner.

[0066] 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 the data before the heating mode ends, it is beneficial to improve the accuracy of judgment. Among them, the time period in the embodiment of the present invention can be adjusted according to the actual situation. For example, it can be one minute before the heating mode ends or one-third of the operating duration of the heating mode.

[0067] It should be noted that when the air conditioner is below the preset frequency threshold, the lubricating oil may precipitate from the refrigerant. Therefore, the operating duration can be the cumulative operating duration of the air conditioner operating at an operating frequency below the preset frequency threshold in the heating mode.

[0068] Refer to Figure 3 , Figure 3 is Figure 2 the specific step diagram of step S200 shown in the figure, including but not limited to the following steps:

[0069] Step S210, determine the oil blockage detection result according to the operating frequency and the operating duration. The oil blockage detection result is used to represent the possibility of an oil blockage fault occurring in the air conditioner;

[0070] Step S220, control the opening degree of the electronic expansion valve 300 of the air conditioner in the defrosting mode according to the oil blockage detection result.

[0071] It can be understood that in the heating mode of the air conditioner, different operating durations and different operating frequencies have different influences on the risk of an oil blockage fault occurring in the air conditioner. Therefore, the oil blockage detection result can be determined according to the operating frequency and the operating duration of the air conditioner in the heating mode. The oil blockage detection result characterizes the possibility of an oil blockage fault occurring in the air conditioner. After the air conditioner switches from the heating mode to the defrosting mode, according to different oil blockage detection results, control the opening degree of the electronic expansion valve 300 of the air conditioner in the defrosting mode, thereby suppressing the risk of an oil blockage fault occurring in the air conditioner. For example, when the oil blockage detection result indicates that the risk of an oil blockage in the air conditioner is relatively high, after the air conditioner switches from the heating mode to the defrosting mode, control the opening degree of the electronic expansion valve 300 to increase; when the oil blockage detection result indicates that the risk of an oil blockage in the air conditioner is relatively low, after the air conditioner switches from the heating mode to the defrosting mode, control the opening degree of the electronic expansion valve 300 to decrease.

[0072] It should be noted that in the heating mode, the risks of oil blockage failure corresponding to different operating frequencies and different operating durations of the air conditioner are also different. The risk probability of oil blockage failure corresponding to the operating frequency of the air conditioner in the heating mode is the first oil blockage failure risk probability, and the risk probability of oil blockage failure corresponding to the operating duration of the air conditioner in the heating mode is the second oil blockage failure risk probability. Therefore, the oil blockage detection result can be determined according to the first oil blockage failure risk probability and the second oil blockage failure risk probability, and then the opening degree of the electronic expansion valve 300 in the defrosting mode can be controlled according to different oil blockage detection results. Specifically, by determining the corresponding oil blockage failure risk probabilities for the operating frequency and the operating duration respectively, the oil blockage detection result can be accurately determined by combining the oil blockage failure risk probabilities of both. For example, the oil blockage detection result can be the average value 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 oil blockage failure of the air conditioner is a high risk. After the air conditioner switches from the heating mode to the defrosting mode, the electronic expansion valve 300 can be controlled to the maximum opening degree, thereby being able to maximally inhibit the occurrence of oil blockage failure of the air conditioner. 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 oil blockage failure of the air conditioner is a low risk. After the air conditioner switches from the heating mode to the defrosting mode, the opening degree of the electronic expansion valve 300 can be controlled to half of the maximum opening degree value, thereby inhibiting the occurrence of oil blockage failure of the air conditioner while reducing the attenuation of the defrosting performance and ensuring the defrosting efficiency.

[0073] Refer to Figure 4 , Figure 4 is Figure 3 the specific step diagram of step S220 shown in the figure, including but not limited to the following steps:

[0074] Step S221, when the oil blockage detection result meets the oil blockage risk condition, control the opening degree of the electronic expansion valve 300 of the air conditioner in the defrosting mode to the maximum opening degree;

[0075] Step S222, when the oil blockage detection result does not meet the oil blockage risk condition, control the opening degree of the electronic expansion valve 300 of the air conditioner in the defrosting mode according to the operating frequency and the operating duration.

[0076] It can be understood that when the oil blockage detection result meets the oil blockage risk condition, it can be considered that the air conditioner has a relatively high oil blockage risk. Therefore, the opening degree of the electronic expansion valve 300 of the air conditioner can be adjusted to the maximum opening degree in the defrosting mode. When the oil blockage detection result does not meet the oil blockage risk condition, it can be considered that the air conditioner has an oil blockage risk but does not need to set the opening degree of the electronic expansion valve 300 to the maximum opening degree in the defrosting mode. At this time, the opening degree of the electronic expansion valve 300 in the defrosting mode can be controlled according to the operating frequency and the operating duration of the air conditioner in the heating mode.

[0077] It should be noted that in the heating mode, when the operating frequency of the air conditioner is lower than the first preset frequency threshold, the viscosity of the lubricating oil increases to a risk of adhering to the electronic expansion valve 300, resulting in a very high risk of oil blockage in the air conditioner. In the heating mode, when the operating duration of the air conditioner is greater than the first preset duration threshold, the accumulated oil condensate in the electronic expansion valve 300 may cause an oil blockage fault in the air conditioner. Therefore, the oil blockage risk condition can be that the operating frequency is less than or equal to the first preset frequency threshold, or the operating duration is greater than or equal to the 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.

[0078] Refer to Figure 5 , Figure 5 is Figure 3 a specific step diagram of another embodiment of step S200 shown in the figure, including but not limited to the following steps:

[0079] Step S230, determine the target opening according to the operating duration and the frequency difference between the operating frequency and the second preset frequency threshold;

[0080] Step S240, control the opening of the electronic expansion valve 300 of the air conditioner in the defrosting mode to be the target opening.

[0081] It can be understood that the shorter the operating duration of the air conditioner in the heating mode, the less lubricating oil adheres to the inside of the electronic expansion valve 300, and the lower the risk of oil blockage fault in the air conditioner. Then, the opening of the electronic expansion valve 300 in the defrosting mode can be adjusted smaller accordingly. The higher the operating frequency of the air conditioner, the greater the pressure in the air conditioner pipeline, and the lower the viscosity of the lubricating oil, that is, it is more difficult for the lubricating oil to adhere to the inside of the electronic expansion valve 300, and the lower the risk of oil blockage fault in the air conditioner. Therefore, the target opening of the air conditioner in the defrosting mode can be determined according to the operating duration of the air conditioner in the heating mode or the frequency difference between the operating frequency of the air conditioner and the second preset frequency. For example, the longer the operating duration of the air conditioner in the heating mode, the larger the target opening of the electronic expansion valve 300 in the defrosting mode. Another example is that the smaller the frequency difference between the operating frequency of the air conditioner in the heating mode and the second preset frequency threshold, the larger the target opening of the electronic expansion valve 300 in the defrosting mode.

[0082] It should be noted that the target opening can also be determined according to the operating duration and the frequency difference between the operating frequency and the second preset frequency threshold. By comprehensively considering the operating duration 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 duration, the target opening corresponding to the operating duration is taken as the opening of the electronic expansion valve 300 in the defrosting mode. Another example is that the opening of the electronic expansion valve 300 in the defrosting mode can be the average value 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 duration.

[0083] It should be noted that the second preset frequency threshold can be the first preset frequency threshold, and the second preset frequency threshold can also be the average operating frequency of the air conditioner in the heating mode.

[0084] Refer to Figure 6 , Figure 6 is Figure 5 the specific step diagram of step S230 shown in the figure, including but not limited to the following steps:

[0085] Step S231: Obtain the opening adjustment parameter, calculate the product of the reciprocal of the operating duration, the opening adjustment parameter, and the frequency difference between the operating frequency and the second preset frequency threshold to obtain the adjustment amplitude;

[0086] Step S232: Subtract the adjustment amplitude from the maximum opening of the electronic expansion valve 300 of the air conditioner to obtain the target opening.

[0087] It can be understood that the shorter the operating duration of the air conditioner in the heating mode, the lower the probability of lubricating oil adhering to the inside of the electronic expansion valve 300, and thus the lower the risk of oil blockage failure of the air conditioner. The higher the operating frequency of the air conditioner, the greater the pressure in the air conditioner pipeline, and thus the lower the viscosity of the lubricating oil, that is, the lubricating oil is more difficult to adhere to the inside of the electronic expansion valve 300, and the risk of oil blockage failure of the air conditioner is also lower. Therefore, before the air conditioner switches from the heating mode to the defrosting mode, the shorter the operating duration of the air conditioner, the smaller the opening of the electronic expansion valve 300 compared to the maximum opening when the air conditioner switches from the heating mode to the defrosting mode. Similarly, before the air conditioner switches from the heating mode to the defrosting mode, the higher the operating frequency of the air conditioner, the smaller the opening of the electronic expansion valve 300 compared to the maximum opening when the air conditioner switches from the heating mode to the defrosting mode.

[0088] Specifically, by obtaining the operating frequency and operating duration of the air conditioner in the heating mode, then multiplying the reciprocal of the operating duration, the opening adjustment parameter, and the difference between the operating frequency and the second preset frequency threshold, the calculation result is the adjustment amplitude of the electronic expansion valve 300 after switching from the heating mode to the defrosting 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 defrosting mode can be calculated.

[0089] It should be noted that multiplying the reciprocal of the operating duration and the frequency difference between the operating frequency and the second preset frequency threshold can only calculate the risk of oil blockage failure of the air conditioner. Therefore, it is necessary to convert the risk of oil blockage failure into the adjustment amplitude of the electronic expansion valve 300 through the opening adjustment parameter. Among them, the opening adjustment parameter can be a preset parameter or the opening of the electronic expansion valve 300 of the air conditioner in the heating mode.

[0090] Specifically, when the opening adjustment parameter is the opening of the electronic expansion valve 300 of the air conditioner in the heating mode, that is, according to the opening of the electronic expansion valve 300 of the air conditioner in the heating mode and the risk of oil blockage failure of the air conditioner, the adjustment amplitude of the electronic expansion valve 300 of the air conditioner in the defrosting mode is determined. The adjustment amplitude of the electronic expansion valve 300 in the defrosting mode is not only affected by the risk of oil blockage failure of the air conditioner, but also affected by the opening of the electronic expansion valve 300 in the heating mode. Therefore, the opening of the electronic expansion valve 300 of the air conditioner in the heating mode can be used as the opening adjustment parameter, which can make the target opening of the electronic expansion valve 300 in the defrosting mode more in line with the current risk of oil blockage failure of the air conditioner.

[0091] It should be noted that the second preset frequency threshold can be the first preset frequency threshold, and the second preset frequency threshold can also be the average operating frequency of the air conditioner in the heating mode.

[0092] Refer to Figure 7 , Figure 7 is Figure 5 The specific step diagram of step S240 shown in the figure includes but is not limited to the following steps:

[0093] Step S241, 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;

[0094] It can be understood that increasing the opening degree of the electronic expansion valve 300 in the defrosting mode is beneficial to reducing the risk of oil blockage failure of the air conditioner. However, the greater the opening degree of the electronic expansion valve 300, the lower the defrosting efficiency of the air conditioner, and thus the longer the operation duration of the defrosting mode. Moreover, the oil blockage risk of the air conditioner is not constant. After the opening degree of the electronic expansion valve 300 increases for a period of time in the defrosting mode, the oil blockage risk of the air conditioner will decrease. Therefore, after the opening degree of the electronic expansion valve 300 increases or decreases for a period of time, the opening degree of the electronic expansion valve 300 can be adjusted to the opening degree under normal conditions to reduce the impact of the opening degree adjustment of the electronic expansion valve 300 on the defrosting efficiency of the air conditioner.

[0095] Specifically, the opening degree adjustment duration can be determined by the frequency difference between the operating frequency and the second preset frequency threshold or the time difference between the operating duration and the second preset duration threshold. The opening degree adjustment duration is the duration during which the opening degree of the electronic expansion valve 300 is the target opening degree in the defrosting mode. For example, the smaller the frequency difference between the operating frequency and the second preset frequency threshold, the longer the opening degree adjustment duration; the larger the time difference between the operating duration and the first preset duration threshold, the longer the opening degree adjustment duration. Herein, the first preset time threshold indicates that after the operating duration of the air conditioner in the heating mode reaches the first preset time threshold, there are more oil coagulation flocs accumulated in the electronic expansion valve 300, and the risk of oil blockage failure of the air conditioner is relatively high.

[0096] It should be noted that the opening degree adjustment duration corresponding to the frequency difference between the operating frequency of the air conditioner and the second preset frequency threshold in the heating mode is the first opening degree adjustment duration, and the opening degree adjustment duration corresponding to the time difference between the operating duration of the air conditioner and the second preset duration threshold in the heating mode is the second opening degree adjustment duration. The opening degree adjustment duration can also be determined according to the first opening degree adjustment duration and the second opening degree adjustment duration.

[0097] Specifically, when the first opening degree adjustment duration is less than the second opening degree adjustment duration, the second opening degree adjustment duration is taken as the opening degree adjustment duration. For another example, the opening degree adjustment duration can be the average value of the first opening degree adjustment duration and the second opening degree adjustment duration.

[0098] In a second aspect, with reference 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 control method of the air conditioner in the first aspect embodiment as above. For example, execute the method steps S100 to S200 in Figure 2 , the method steps S210 to S220 in Figure 3 , the method step S221 or the method step S222 in Figure 4 , Figure 5the method steps S230 to S240 in Figure 6 the method steps S231 to S232 in Figure 7 and the method step S241 in

[0099] 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 control method of the air conditioner in the above embodiments of the present invention. The processor 820 realizes the control 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.

[0100] 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 control 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, enterprise intranets, local area networks, mobile communication networks, and combinations thereof.

[0101] In a third aspect, an embodiment of the present invention provides an air conditioner, which includes an operation control device 800 as in the embodiment of the second aspect. Therefore, the refrigerant circulation speed and refrigerant pressure corresponding to different air conditioner operating frequencies are different, which in turn causes the viscosity of the lubricating oil to be different. And high-viscosity lubricating oil will adhere to the electronic expansion valve, which in turn causes an oil blockage fault in the air conditioner. At the same time, as the working time of the air conditioner increases, the lubricating oil separated from the refrigerant will continuously adhere to the electronic expansion valve, thereby forming oil coagulation flocs, increasing the risk of the air conditioner having an oil blockage fault.

[0102] In addition, 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. When the air conditioner switches from the heating mode to the defrosting mode, the working conditions at both ends of the electronic expansion valve will change violently, which may exacerbate the change in the viscosity of the lubricating oil, thereby increasing the risk of the air conditioner having an oil blockage fault. Therefore, according to the operating frequency and operating duration of the air conditioner in the heating mode, the risk of the air conditioner having an oil blockage fault is judged in advance, and then the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode is controlled, which can quickly suppress the air conditioner from having an oil blockage fault.

[0103] Fourthly, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the control method of the air conditioner according to the first aspect embodiment above, for example, to execute Figure 2 method steps S100 to S200 in Figure 3 method steps S210 to S220 in Figure 4 method step S221 or method step S222 in Figure 5 method steps S230 to S240 in Figure 6 method steps S231 to S232 in Figure 7 and method step S241 in

[0104] Those of ordinary skill in the art can understand 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 physical components or all 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 implemented as hardware, or implemented 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 cassette, 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, as is well known to those of ordinary skill in the art, a communication medium generally 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 medium.

[0105] The embodiments of the present invention have been described in detail above with reference to the 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. A control method for an air conditioner, characterized in that, it includes: When the air conditioner switches from the heating mode to the defrosting mode, obtain the operating frequency and operating duration of the air conditioner in the heating mode; According to the operating frequency and the operating duration, control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode.

2. The control method according to claim 1, characterized in that, The controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the operating frequency and the operating duration includes: Determine an oil blockage detection result according to the operating frequency and the operating duration, and the oil blockage detection result is used to represent the possibility of an oil blockage fault occurring in the air conditioner; According to the oil blockage detection result, control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode.

3. The control method according to claim 2, characterized in that, The controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the oil blockage detection result includes: When the oil blockage detection result meets the oil blockage risk condition, control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode to the maximum opening degree; Or, When the oil blockage detection result does not meet the oil blockage risk condition, control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the operating frequency and the operating duration.

4. The control method according to claim 3, characterized in that, 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.

5. The control method according to any one of claims 1 to 4, characterized in that, The controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode according to the operating frequency and the operating duration includes: Determine a target opening degree according to the operating duration and the frequency difference between the operating frequency and a second preset frequency threshold; Control the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode to the target opening degree.

6. The control method according to claim 5, characterized in that, The determining the target opening degree according to the operating duration and the second frequency difference between the operating frequency and the second preset frequency threshold includes: Obtain an opening degree adjustment parameter, perform a product calculation on the reciprocal of the operating duration, the opening degree adjustment parameter, and the frequency difference between the operating frequency and the second preset frequency threshold to obtain an adjustment amplitude; Obtain the target opening degree by subtracting the adjustment amplitude from the maximum opening degree of the electronic expansion valve of the air conditioner.

7. The control method according to claim 5, characterized in that, The controlling the opening degree of the electronic expansion valve of the air conditioner in the defrosting mode to the target opening degree includes: Obtain an opening degree 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 a second preset duration threshold; Control the air conditioner to operate for the opening adjustment duration with the opening degree of the electronic expansion valve as the target opening degree in the defrosting mode.

8. The control method according to claim 1, wherein, the operation duration is the cumulative operation duration of the air conditioner operating at an operation frequency lower than a preset frequency threshold in the heating mode.

9. The control method according to claim 1, wherein, the operation frequency is the operation frequency of the air conditioner within a time period before ending the heating mode.

10. An operation control device, wherein, comprising 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 for the air conditioner according to any one of claims 1 to 9.

11. An air conditioner, wherein, comprising 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 for the air conditioner according to any one of claims 1 to 9.

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