Air conditioner electronic expansion valve monitoring method and device

Abstract

The application provides an air conditioner electronic expansion valve monitoring method and device. The method comprises the following steps: determining a flow inflection point calibration interval of an air conditioner electronic expansion valve based on an air conditioner electronic expansion valve flow inflection point calibration strategy; when it is monitored that the actual opening degree of the air conditioner electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of an air conditioner compressor and the target exhaust temperature is less than a preset temperature threshold, it is determined that the air conditioner electronic expansion valve is adjusted at the flow inflection point calibration interval; comparing the exhaust temperature of the air conditioner at each opening degree running state in the flow inflection point calibration interval with the target exhaust temperature respectively, determining a target opening degree according to the size of the comparison difference, and controlling the air conditioner electronic expansion valve to run at the target opening degree. The air conditioner electronic expansion valve monitoring method provided by the application can effectively improve the stability of the air conditioner during operation, avoid abnormal fluctuations caused by passing through the flow inflection point, and improve the user experience.

Description

Technical Field

[0001] The present invention relates to the field of electrical control technology, and more particularly to a method and device for monitoring an electronic expansion valve of an air conditioner. Furthermore, the present invention also relates to an electronic device and a processor-readable storage medium. Background Art

[0002] Air conditioners, also known as air conditioners, refer to devices that regulate and control parameters such as the temperature, humidity, and flow rate of indoor ambient air. Currently, existing air conditioners are usually composed of five major components: an evaporator, a condenser, a compressor, a throttling device, and a four-way valve, to achieve cooling / heating operation. Among them, throttling devices usually have three types of methods to achieve the effect of throttling and reducing pressure: capillary tubes, throttling short tubes, and air-conditioning electronic expansion valves. Among them, air-conditioning electronic expansion valves usually achieve flow regulation by driving and controlling a needle valve to move relative to the valve core hole. However, due to the structural characteristics of air-conditioning electronic expansion valves, when adjusting to increase the flow rate, the flow rate growth rate is not constant, but a flow inflection point will appear near a certain opening. After passing this flow inflection point, the flow rate growth rate will be significantly larger when the opening adjustment variable is the same.

[0003] Due to the aforementioned characteristics of existing electronic expansion valves, during cooling / heating operation, the air conditioner uses the compressor's exhaust temperature as a target for electronic expansion valve flow regulation. When the electronic expansion valve's opening reaches the flow inflection point, and the compressor's actual exhaust temperature approaches the system's target exhaust temperature, the electronic expansion valve will adjust back and forth near the flow inflection point. Due to the large flow rate differences, the exhaust temperature during system operation remains unstable and continues to fluctuate periodically within a certain range. This can cause the air outlet temperature of the air conditioner's indoor unit to fluctuate during cooling / heating mode. Continuous fluctuations in the air outlet temperature during cooling mode can also lead to condensation and dripping. Therefore, providing a more stable control solution that avoids abnormal air conditioning fluctuations has become a pressing issue. Summary of the Invention

[0004] To this end, the present invention provides a method and device for monitoring an electronic expansion valve of an air conditioner, so as to solve the problem in the prior art that the air conditioner has poor control stability due to the existence of a flow inflection point.

[0005] In a first aspect, the present invention provides a method for monitoring an air conditioner electronic expansion valve, comprising:

[0006] Determining a flow inflection point calibration interval of the air-conditioning electronic expansion valve based on a preset flow inflection point calibration strategy of the air-conditioning electronic expansion valve;

[0007] When it is monitored that the actual opening of the air-conditioning electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air-conditioning compressor and the target exhaust temperature is less than a preset temperature threshold, it is determined that the air-conditioning electronic expansion valve is adjusted in the flow inflection point calibration interval;

[0008] The exhaust temperatures of the air conditioner at each opening operating state within the flow inflection point calibration interval are compared with the target exhaust temperature, the target opening is determined according to the size of the comparison difference, and the air conditioner electronic expansion valve is controlled to operate at the target opening; wherein, the flow inflection point calibration interval includes the target opening.

[0009] Furthermore, before determining whether the air conditioner electronic expansion valve is adjusted within the flow inflection point calibration interval, the method further includes:

[0010] Determine the target exhaust temperature corresponding to the air conditioner in different operating modes;

[0011] Obtaining the measured compressor exhaust temperature of the air conditioner in different operating modes;

[0012] determining a difference between the measured compressor exhaust temperature and the target exhaust temperature, and when the difference is less than the temperature threshold, entering a sampling monitoring mode; monitoring the compressor exhaust temperature and the corresponding air-conditioning electronic expansion valve opening during air-conditioning operation within a preset time range under the sampling monitoring mode, and determining a minimum compressor exhaust temperature and a maximum compressor exhaust temperature during air-conditioning operation within the time range based on the monitoring results, and determining a minimum opening and a maximum opening of the air-conditioning electronic expansion valve within the time range;

[0013] When the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature is greater than or equal to the temperature threshold, the air-conditioning system is determined to be in abnormal fluctuation, and the air-conditioning electronic expansion valve is controlled to operate for a preset time at the minimum opening, maximum opening and intermediate opening respectively, and the first exhaust temperature, second exhaust temperature and third exhaust temperature corresponding to the air-conditioning under the minimum opening condition are monitored respectively; from the first exhaust temperature, the second exhaust temperature and the third exhaust temperature, the exhaust temperature with the smallest difference from the target exhaust temperature is determined, and the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature is determined; wherein, the exhaust temperature is the first exhaust temperature, the second exhaust temperature or the third exhaust temperature; the target opening is the minimum opening, the maximum opening or the intermediate opening, and the intermediate opening is the average of the minimum opening and the maximum opening.

[0014] Furthermore, the flow inflection point calibration interval of the air-conditioning electronic expansion valve is determined based on the preset flow inflection point calibration strategy of the air-conditioning electronic expansion valve, specifically including:

[0015] When it is initially determined that the air-conditioning system is in an abnormal fluctuation state, the air-conditioning electronic expansion valve flow inflection point calibration mode is entered; under the air-conditioning electronic expansion valve flow inflection point calibration mode conditions, the flow inflection point calibration mode range of the air-conditioning electronic expansion valve is determined according to the preset electronic expansion valve opening compensation value, the minimum opening and the maximum opening of the air-conditioning electronic expansion valve within the time range, and the opening of the air-conditioning electronic expansion valve is controlled to perform incremental testing according to the preset fixed opening value within the flow inflection point calibration mode range; the air-conditioning electronic expansion valve is operated for a preset time at each opening, the exhaust temperature after the air-conditioning is operated at each opening is recorded, and the flow inflection point calibration interval of the air-conditioning electronic expansion valve is determined according to the exhaust temperature change.

[0016] Furthermore, the flow inflection point calibration interval of the air conditioner electronic expansion valve is determined according to the exhaust temperature change, specifically including:

[0017] Based on the recorded exhaust temperature after the air conditioner is operated at each opening degree, the difference between every two adjacent exhaust temperatures is determined, and the flow inflection point calibration interval of the air conditioner electronic expansion valve is determined according to the difference between the adjacent exhaust temperatures.

[0018] Furthermore, the exhaust temperatures of the air conditioner at various opening operating states within the flow inflection point calibration interval are compared with the target exhaust temperatures, and the target opening is determined according to the comparison differences, specifically including:

[0019] The air conditioner is controlled to operate at a minimum opening, a maximum opening, and an intermediate opening of the air conditioner electronic expansion valve for a preset time, and a plurality of exhaust temperatures corresponding to the minimum opening condition of the air conditioner are monitored respectively;

[0020] The multiple exhaust temperatures are compared with the target exhaust temperature respectively, and the exhaust temperature with the smallest difference from the target exhaust temperature is determined according to the comparison difference, and the opening corresponding to the exhaust temperature is determined as the target opening of the air conditioner electronic expansion valve.

[0021] Furthermore, the determination of the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature specifically includes: when there is a minimum difference between two exhaust temperatures and the target exhaust temperature, determining the opening corresponding to the two exhaust temperatures with the smaller difference between the current air-conditioning electronic expansion valve opening as the target opening of the air-conditioning electronic expansion valve.

[0022] Furthermore, after determining that there are two exhaust temperatures with the smallest difference from the target exhaust temperature, it also includes: detecting the temperature of the indoor unit heat exchanger coil, selecting the opening corresponding to the lower coil temperature as the target opening of the air-conditioning electronic expansion valve in the cooling operation mode, and selecting the opening corresponding to the higher coil temperature as the target opening of the air-conditioning electronic expansion valve in the heating operation mode.

[0023] In a second aspect, the present invention further provides an air-conditioning electronic expansion valve monitoring device, comprising:

[0024] A flow inflection point calibration unit, configured to determine a flow inflection point calibration interval of the air-conditioning electronic expansion valve based on a preset flow inflection point calibration strategy of the air-conditioning electronic expansion valve;

[0025] a flow inflection point adjustment determination unit, configured to determine that the air conditioner electronic expansion valve is to be adjusted within the flow inflection point calibration interval when it is monitored that the actual opening of the air conditioner electronic expansion valve reaches the flow inflection point calibration interval and the difference between the actual exhaust temperature of the air conditioner compressor and the target exhaust temperature is less than a preset temperature threshold;

[0026] An air conditioner electronic expansion valve control unit is used to compare the exhaust temperature of the air conditioner at each opening operating state within the flow inflection point calibration interval with the target exhaust temperature, determine the target opening according to the size of the comparison difference, and control the air conditioner electronic expansion valve to operate at the target opening; wherein, the flow inflection point calibration interval includes the target opening.

[0027] Furthermore, before determining whether the air-conditioning electronic expansion valve is adjusted in the flow inflection point calibration interval, the method further includes: a target opening determination unit configured to:

[0028] Determine the target exhaust temperature corresponding to the air conditioner in different operating modes;

[0029] Obtaining the measured compressor exhaust temperature of the air conditioner in different operating modes;

[0030] determining a difference between the measured compressor exhaust temperature and the target exhaust temperature, and when the difference is less than the temperature threshold, entering a sampling monitoring mode; monitoring the compressor exhaust temperature and the corresponding air-conditioning electronic expansion valve opening during air-conditioning operation within a preset time range under the sampling monitoring mode, and determining a minimum compressor exhaust temperature and a maximum compressor exhaust temperature during air-conditioning operation within the time range based on the monitoring results, and determining a minimum opening and a maximum opening of the air-conditioning electronic expansion valve within the time range;

[0031] When the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature is greater than or equal to the temperature threshold, the air-conditioning system is determined to be in abnormal fluctuation, and the air-conditioning electronic expansion valve is controlled to operate for a preset time at the minimum opening, maximum opening and intermediate opening respectively, and the first exhaust temperature, second exhaust temperature and third exhaust temperature corresponding to the air-conditioning under the minimum opening condition are monitored respectively; from the first exhaust temperature, the second exhaust temperature and the third exhaust temperature, the exhaust temperature with the smallest difference from the target exhaust temperature is determined, and the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature is determined; wherein, the exhaust temperature is the first exhaust temperature, the second exhaust temperature or the third exhaust temperature; the target opening is the minimum opening, the maximum opening or the intermediate opening, and the intermediate opening is the average of the minimum opening and the maximum opening.

[0032] Furthermore, the flow inflection point calibration unit is specifically used to:

[0033] When it is initially determined that the air-conditioning system is in an abnormal fluctuation state, the air-conditioning electronic expansion valve flow inflection point calibration mode is entered; under the air-conditioning electronic expansion valve flow inflection point calibration mode conditions, the flow inflection point calibration mode range of the air-conditioning electronic expansion valve is determined according to the preset electronic expansion valve opening compensation value, the minimum opening and the maximum opening of the air-conditioning electronic expansion valve within the time range, and the opening of the air-conditioning electronic expansion valve is controlled to perform incremental testing according to the preset fixed opening value within the flow inflection point calibration mode range; the air-conditioning electronic expansion valve is operated for a preset time at each opening, the exhaust temperature after the air-conditioning is operated at each opening is recorded, and the flow inflection point calibration interval of the air-conditioning electronic expansion valve is determined according to the exhaust temperature change.

[0034] Furthermore, the flow inflection point calibration interval of the air conditioner electronic expansion valve is determined according to the exhaust temperature change, specifically including:

[0035] Based on the recorded exhaust temperature after the air conditioner is operated at each opening degree, the difference between every two adjacent exhaust temperatures is determined, and the flow inflection point calibration interval of the air conditioner electronic expansion valve is determined according to the difference between the adjacent exhaust temperatures.

[0036] Furthermore, the air conditioner electronic expansion valve control unit is specifically used to:

[0037] The air conditioner is controlled to operate at a minimum opening, a maximum opening, and an intermediate opening of the air conditioner electronic expansion valve for a preset time, and a plurality of exhaust temperatures corresponding to the minimum opening condition of the air conditioner are monitored respectively;

[0038] The multiple exhaust temperatures are compared with the target exhaust temperature respectively, and the exhaust temperature with the smallest difference from the target exhaust temperature is determined according to the comparison difference, and the opening corresponding to the exhaust temperature is determined as the target opening of the air conditioner electronic expansion valve.

[0039] Furthermore, the determination of the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature specifically includes: when there is a minimum difference between two exhaust temperatures and the target exhaust temperature, determining the opening corresponding to the two exhaust temperatures with the smaller difference between the current air-conditioning electronic expansion valve opening as the target opening of the air-conditioning electronic expansion valve.

[0040] Furthermore, after determining that there are two exhaust temperatures with the smallest difference from the target exhaust temperature, it also includes: a target opening determination unit, which is used to detect the temperature of the indoor unit heat exchanger coil, and select the opening corresponding to the lower coil temperature as the target opening of the air-conditioning electronic expansion valve in the cooling operation mode, and select the opening corresponding to the higher coil temperature as the target opening of the air-conditioning electronic expansion valve in the heating operation mode.

[0041] In a third aspect, the present invention also provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the air-conditioning electronic expansion valve monitoring method as described in any one of the above items are implemented.

[0042] In a fourth aspect, the present invention further provides a processor-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the air-conditioning electronic expansion valve monitoring method as described in any one of the above items are implemented.

[0043] The air-conditioning electronic expansion valve monitoring method provided by the present invention determines the flow inflection point calibration interval of the air-conditioning electronic expansion valve through the flow inflection point calibration strategy of the air-conditioning electronic expansion valve. When it is monitored that the actual opening of the air-conditioning electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air-conditioning compressor and the target exhaust temperature is less than a preset temperature threshold, it is determined that the air-conditioning electronic expansion valve is adjusted at the flow inflection point calibration interval, and the exhaust temperature of the air-conditioning under each opening operating state within the flow inflection point calibration interval is compared with the target exhaust temperature, and the target opening is determined according to the size of the comparison difference, and the air-conditioning electronic expansion valve is controlled to be adjusted to operate at the target opening, thereby effectively improving the stability of the air-conditioning during operation, avoiding abnormal fluctuations caused by passing through the flow inflection point during the air-conditioning temperature adjustment process, and greatly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 1 is a flow chart of a method for monitoring an air-conditioning electronic expansion valve provided by an embodiment of the present invention;

[0046] Figure 2 Schematic diagram of flow curve changes of an air conditioner electronic expansion valve in the air conditioner electronic expansion valve monitoring method provided by an embodiment of the present invention;

[0047] Figure 3 This is a graph showing the relationship between valve opening and exhaust temperature in a flow inflection point calibration mode for an air-conditioning electronic expansion valve provided by an embodiment of the present invention;

[0048] Figure 4 Schematic diagram of the structure of the air-conditioning electronic expansion valve monitoring device provided by an embodiment of the present invention;

[0049] Figure 5 It is a schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0051] The following describes in detail an embodiment of the air-conditioning electronic expansion valve monitoring method according to the present invention. Figure 1 As shown in FIG, it is a flow chart of the air-conditioning electronic expansion valve monitoring method provided by an embodiment of the present invention, and the specific implementation process includes the following steps:

[0052] Step 101: Determine a flow inflection point calibration interval of the air conditioner electronic expansion valve based on a preset flow inflection point calibration strategy of the air conditioner electronic expansion valve.

[0053] In an embodiment of the present invention, before controlling the air-conditioning electronic expansion valve, it is necessary to predetermine the flow inflection point calibration interval of the air-conditioning electronic expansion valve and determine from the flow inflection point calibration interval the target opening so that the air-conditioning electronic expansion valve can operate stably when passing through the flow inflection point position during the temperature adjustment process.

[0054] Specifically, a target opening of the air conditioner electronic expansion valve is determined so that it can operate stably when passing through the flow inflection point during the temperature regulation process. The corresponding implementation process includes: determining the target exhaust temperature corresponding to the air conditioner in different operating modes (such as cooling / heating mode); obtaining the measured compressor exhaust temperature of the air conditioner in different operating modes; determining the difference between the measured compressor exhaust temperature and the target exhaust temperature, and when the difference is less than or equal to the temperature threshold, entering a sampling monitoring mode; under the conditions of the sampling monitoring mode, monitoring the compressor exhaust temperature and the corresponding air conditioner electronic expansion valve opening during the operation of the air conditioner within a preset time range, determining the minimum compressor exhaust temperature and the maximum compressor exhaust temperature during the operation of the air conditioner within the time range according to the monitoring results, and determining the minimum opening and maximum opening of the air conditioner electronic expansion valve within the time range; when the maximum pressure When the difference between the compressor exhaust temperature and the minimum compressor exhaust temperature is greater than the temperature threshold, the air-conditioning system is determined to be in abnormal fluctuation, and the air-conditioning electronic expansion valve is controlled to run for a preset time at the minimum opening, maximum opening and intermediate opening respectively, and the first exhaust temperature, second exhaust temperature and third exhaust temperature corresponding to the air-conditioning under the minimum opening condition are monitored respectively; from the first exhaust temperature, the second exhaust temperature and the third exhaust temperature, the exhaust temperature with the smallest difference from the target exhaust temperature is determined, and the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature is determined; wherein, the exhaust temperature is the first exhaust temperature, the second exhaust temperature or the third exhaust temperature; the target opening is the minimum opening, the maximum opening or the intermediate opening, and the intermediate opening is the average of the minimum opening and the maximum opening.

[0055] For example, the target exhaust temperature corresponding to different operating modes is preset in the air-conditioning system as t1 (i.e., the target exhaust temperature of the air-conditioning compressor under different operating modes). The air-conditioning electronic expansion valve is adjusted according to the comparison between the measured compressor exhaust temperature and the target exhaust temperature. If it is lower than the target exhaust, the valve is closed, and if it is higher than the target exhaust, the valve is opened. The measured compressor exhaust temperature during real-time operation of the air-conditioning is t2. The flow inflection point range value of the air-conditioning electronic expansion valve in the air-conditioning system (flow inflection point calibration interval) is: L1-L2 (due to the production consistency problem of the air-conditioning electronic expansion valve, the flow inflection point may appear at any position within this range). Δt=|t1-t2|, preset sampling time S1 (i.e., preset time range), the temperature threshold t3 can be 2°C, the actual opening degree k of the air-conditioning electronic expansion valve, when Δt<2°C (t3 can be a value between 1°C and 4°C, which is not specifically limited here), enters the sampling monitoring mode, and within the preset sampling time S1, the air-conditioning electronic expansion valve opening degree k is monitored for the compressor exhaust temperature t2 to determine the maximum compressor exhaust temperature t 2maand minimum compressor discharge temperature t 2min , the maximum opening degree k of the air conditioner electronic expansion valve max and the minimum opening k of the air conditioning electronic expansion valve min , and calculate Δt2=|t 2ma -t 2min |, Δk=|k max -k min |. When Δt2≤t3℃, that is, the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature is less than the temperature threshold, it is determined that the air conditioning system is operating stably and no abnormal fluctuations occur. The air conditioning system continues to operate according to the original set operating mode and continues to monitor. When Δt2>t3℃, that is, the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature is less than the temperature threshold (that is, greater than the temperature threshold t3, t3 can be a value between 1℃ and 4℃), it is determined that the system is fluctuating abnormally, and k max and k min At least one of them is within the range of L1-L2 (i.e. L1≤k max ≤L2,L1≤k min ≤L2 ​​has one satisfied); the following control methods can be executed:

[0056] Stable at the maximum opening k max and minimum opening k min and the middle opening Stable operation preset time, monitoring the corresponding first exhaust temperature t k1 , the second exhaust temperature t k2 and the third exhaust temperature t k3 , and compare them with the target exhaust temperature t1 respectively, select the valve opening closer to t1 as the target opening, and control the air conditioner electronic expansion valve to adjust to the target opening for stable operation.

[0057] Among them, based on the flow inflection point calibration strategy of the air-conditioning electronic expansion valve, the flow inflection point calibration interval of the air-conditioning electronic expansion valve is determined, and the corresponding specific implementation process includes: when the air-conditioning system is initially determined to be in an abnormal fluctuation state, entering the flow inflection point calibration mode of the air-conditioning electronic expansion valve; under the flow inflection point calibration mode conditions of the air-conditioning electronic expansion valve, according to the preset electronic expansion valve opening compensation value, the minimum opening and maximum opening of the air-conditioning electronic expansion valve within the time range, the flow inflection point calibration mode range of the air-conditioning electronic expansion valve is determined, and the opening of the air-conditioning electronic expansion valve is controlled to perform incremental testing according to the preset fixed opening value within the flow inflection point calibration mode range; running for a preset time at each opening, recording the exhaust temperature after the air-conditioning is run at each opening, and determining the flow inflection point calibration interval of the air-conditioning electronic expansion valve according to the exhaust temperature change. That is, the flow inflection point calibration strategy for an air conditioner electronic expansion valve according to the present invention includes: determining the flow inflection point calibration mode range of the air conditioner electronic expansion valve according to a preset electronic expansion valve opening compensation value, the minimum opening, and the maximum opening of the air conditioner electronic expansion valve within the time range under the flow inflection point calibration mode of the air conditioner electronic expansion valve, and controlling the opening of the air conditioner electronic expansion valve to perform incremental testing within the flow inflection point calibration mode according to a preset fixed opening value; operating the air conditioner at each opening for a preset time, recording the exhaust temperature after the air conditioner is operated at each opening, and determining the flow inflection point calibration interval of the air conditioner electronic expansion valve based on the exhaust temperature change. Specifically, determining the flow inflection point calibration interval of the air conditioner electronic expansion valve based on the exhaust temperature change may include: determining the difference between two adjacent exhaust temperatures based on the recorded exhaust temperatures after the air conditioner is operated at each opening, and determining the flow inflection point calibration interval of the air conditioner electronic expansion valve based on the difference between the adjacent exhaust temperatures.

[0058] For example, when the air conditioner enters the determination mode for the first time, when Δt2>t3°C, the air conditioner system enters the electronic expansion valve flow inflection point calibration mode: the air conditioner system presets the electronic expansion valve opening compensation value k1 (k1 can be a value within the range of 10 to 40 steps of opening, that is, a fixed opening value), and the maximum opening k of the air conditioner electronic expansion valve monitored within the above preset time S1 is max and the minimum opening k of the air conditioning electronic expansion valve min , with k min -k1 to k max +k1 is used as the flow inflection point calibration mode range. The air conditioning system controls the operation parameters of the air conditioner indoor and outdoor units to operate stably. Only when the opening of the electronic expansion valve is from k min -k1 to k max+k1, perform incremental testing according to 1 to 5 (a fixed value between 1 and 5) step openings (i.e., fixed opening values), each opening is stably operated for a preset time (e.g., 5 to 30 minutes, which can be a fixed value in this interval), and record the exhaust temperature after stable operation, and calculate the difference between each two adjacent exhaust temperatures to confirm the exhaust temperature changes caused by adjacent opening changes, thereby determining the flow inflection point calibration interval (i.e., flow inflection point position). It should be noted that by recording the flow inflection point position determined by the flow inflection point calibration mode of the air-conditioning electronic expansion valve, during subsequent air-conditioning operation, when it is monitored that Δt < 2°C occurs again, and the real-time valve opening is about to pass the flow inflection point position, directly stably operate for a predetermined time before and after the flow inflection point, and compare the exhaust temperature with the target exhaust temperature, and directly determine which side of the air-conditioning electronic expansion valve is adjusted and stably operated before and after the inflection point, thereby avoiding the above-mentioned complex judgment process each time.

[0059] Step 102: When it is monitored that the actual opening of the air-conditioning electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air-conditioning compressor and the target exhaust temperature is less than a preset temperature threshold, it is determined that the air-conditioning electronic expansion valve is adjusted at the flow inflection point calibration interval.

[0060] During the air conditioner temperature adjustment process, it is necessary to determine whether the air conditioner electronic expansion valve is adjusting within the flow inflection point calibration interval. Specifically, the actual opening of the air conditioner electronic expansion valve can be monitored in real time. When the actual opening reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air conditioner compressor and the target exhaust temperature is less than a preset temperature threshold, the air conditioner electronic expansion valve is determined to be adjusting within the flow inflection point calibration interval, thereby executing subsequent stable operation control of the air conditioner electronic expansion valve.

[0061] Step 103: Compare the exhaust temperatures of the air conditioner at each opening operating state within the flow inflection point calibration interval with the target exhaust temperature, determine the target opening according to the size of the comparison difference, and control the air conditioner electronic expansion valve to operate at the target opening; wherein, the flow inflection point calibration interval includes the target opening.

[0062] Specifically, the air conditioner can be controlled to run for a preset time at the minimum opening, maximum opening and intermediate opening of the air conditioner electronic expansion valve, and multiple exhaust temperatures corresponding to the air conditioner under the minimum opening condition can be monitored respectively, such as the first exhaust temperature, the second exhaust temperature and the third exhaust temperature; the multiple exhaust temperatures are compared with the target exhaust temperature respectively, and the exhaust temperature with the smallest difference from the target exhaust temperature is determined according to the comparison difference, and the opening corresponding to the exhaust temperature is determined as the target opening of the air conditioner electronic expansion valve.

[0063] Among them, the specific implementation process of determining the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature includes: when the difference between two exhaust temperatures and the target exhaust temperature is the smallest, the opening corresponding to the two exhaust temperatures with the smaller difference between the current air-conditioning electronic expansion valve opening is determined as the target opening of the air-conditioning electronic expansion valve; or, when the difference between two exhaust temperatures and the target exhaust temperature is the smallest, the indoor unit heat exchanger coil temperature is detected, and in the cooling operation mode, the opening corresponding to the lower coil temperature is selected as the target opening of the air-conditioning electronic expansion valve, and in the heating operation mode, the opening corresponding to the higher coil temperature is selected as the target opening of the air-conditioning electronic expansion valve.

[0064] like Figure 2 The figure below shows the flow rate curve for an air conditioner's electronic expansion valve. Under varying valve openings, the flow rate of an air conditioner's electronic expansion valve increases as the valve opening increases. However, there is typically a flow inflection point midway between the opening and the target. The flow rate growth rates before and after the inflection point vary significantly. During air conditioner operation, if the valve opening is near this point and the actual compressor discharge temperature is close to the target discharge temperature, the significant difference in flow rate before and after the inflection point can cause the air conditioner's valve opening to adjust, leading to wide fluctuations in discharge temperature. This can cause fluctuations in air conditioner operation and lead to problems such as condensation and noise. If the system's preset target discharge temperature, t1, is 80°C (the target discharge temperature of the air conditioner compressor; the electronic expansion valve adjusts based on the measured compressor discharge temperature compared to the target discharge temperature; if it falls below the target, the valve closes; if it rises above the target, the valve opens), and the actual compressor discharge temperature, t2, during actual operation, is 79°C, the system's set flow inflection point range for the electronic expansion valve is: L1-L2: 330-370°C. (Due to manufacturing consistency issues with electronic expansion valves, the flow inflection point can occur anywhere within this range.) Δt=80-79=1℃, preset sampling time (preset time) S1=30min, temperature threshold t3=2℃, actual opening of air conditioner electronic expansion valve k, when Δt=1<2℃, enter sampling monitoring mode, that is, within 30min, for the measured compressor exhaust temperature t2, air conditioner electronic expansion valve opening k monitoring, determine the maximum compressor exhaust temperature t 2max =82 and minimum compressor discharge temperature t 2min =77, the maximum opening degree k of the air conditioner electronic expansion valve max =340 and the minimum opening of the air-conditioning electronic expansion valve k min =332, and calculate the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature Δt2=|t 2m -t 2min |=5°C, the difference between the minimum opening and the maximum opening of the air-conditioning electronic expansion valve Δk=|k max -k min|=8. When Δt2=5℃>2℃ (ie greater than the threshold t3, t3 can be a value between 1℃~4℃), it is determined that the system fluctuates abnormally, and k max and k min Both are within the range of L1-L2, and the following control mode can be executed: stabilize at the maximum opening 340, the middle opening 336 and the minimum opening 332 for a preset time, and monitor the corresponding first exhaust temperature t k1 =77 and the second exhaust temperature T k2 =79, the third exhaust temperature t k3 =82, and compared with the target exhaust temperature t1, the valve opening closer to t1 is selected as the target opening (336), that is, the air conditioner electronic expansion valve is adjusted to 336 opening for stable operation. k1 =77 and the second exhaust gas temperature t k2 =78, the third exhaust temperature t k3 =82, if two exhaust temperatures have the same difference from the target exhaust temperature, the air conditioner will operate directly at the last stable opening. Alternatively, the opening corresponding to the two exhaust temperatures with the smaller difference from the current air conditioner electronic expansion valve opening will be determined as the target opening of the air conditioner electronic expansion valve. For example, if the current air conditioner electronic expansion valve opening is 334, and the openings corresponding to the two exhaust temperatures are 330 and 332, the air conditioner will be controlled to operate stably at an opening of 332. Based on this, the indoor unit heat exchanger coil temperature can also be detected. In cooling mode, the opening with the lower coil temperature is selected, while in heating mode, the opening with the higher coil temperature is selected for stable operation. Based on the above monitoring and control methods, the aforementioned problem of fluctuating air conditioner operation can be avoided, thereby solving the corresponding condensation and noise problems.

[0065] On the basis of the control scheme above, since Δt=80-79=1℃, the preset sampling time S1=30min, the temperature threshold t3=2℃, the actual opening of the electronic expansion valve k, when Δt=1<2℃, enter the sampling monitoring mode, within the time 30min, for the exhaust temperature t2, the electronic expansion valve opening k is monitored, confirming t 2max =82 and t 2min =77,k max =340 and k min =332. The air conditioner enters the electronic expansion valve flow inflection point calibration mode, k1 = 10, then the air conditioner indoor and outdoor unit operating parameters are stable, the electronic expansion valve opening is calibrated between 332-10 = 322 opening and 340 + 10 = 350 opening. If the single adjustment opening is set to 2 steps, then stable operation is carried out in sequence at 322, 324 ... 348, 350 and the exhaust temperature is monitored when stable. Figure 3The valve opening-exhaust temperature data for entering the electronic expansion valve flow inflection point calibration mode is shown, so that the electronic expansion valve opening range 338-340 can be determined as the electronic expansion valve flow inflection point of the air conditioner. Figure 3 The vertical axis is the exhaust temperature, and the horizontal axis is the opening of the air-conditioning electronic expansion valve. The air-conditioning system records this interval (338-340) as the flow inflection point calibration interval. In the specific implementation process, when the air-conditioning system is used again, when the opening of the air-conditioning electronic expansion valve reaches the vicinity of the 338-340 interval (which can be the ±2 to 4 steps of the inflection point interval, i.e. the flow inflection point calibration interval), and the difference between the actual exhaust temperature and the target exhaust temperature is less than 1 to 3°C, the air-conditioning system directly operates stably at the two valve openings of 338 and 340 respectively, and compares the exhaust temperature with the target exhaust temperature, and directly determines whether the air-conditioning electronic expansion valve is adjusted and operated stably on one side before and after the flow inflection point, avoiding entering the initial complex judgment mode every time.

[0066] The air-conditioning electronic expansion valve monitoring method described in the embodiment of the present invention determines the flow inflection point calibration interval of the air-conditioning electronic expansion valve through the air-conditioning electronic expansion valve flow inflection point calibration strategy. When it is monitored that the actual opening of the air-conditioning electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air-conditioning compressor and the target exhaust temperature is less than the preset temperature threshold, it is determined that the air-conditioning electronic expansion valve is adjusted at the flow inflection point calibration interval, and the exhaust temperature of the air-conditioning under each opening operating state within the flow inflection point calibration interval is compared with the target exhaust temperature. The target opening is determined according to the size of the comparison difference, and the air-conditioning electronic expansion valve is controlled to adjust to operate at the target opening, thereby effectively improving the stability of the air-conditioning during operation, avoiding abnormal fluctuations caused by passing through the flow inflection point during the air-conditioning temperature adjustment process, and greatly improving the user experience.

[0067] Corresponding to the above-mentioned air-conditioning electronic expansion valve monitoring method, the present invention also provides an air-conditioning electronic expansion valve monitoring device. Since the embodiment of the device is similar to the above-mentioned method embodiment, the description is relatively simple. For relevant details, please refer to the description of the above-mentioned method embodiment. The embodiment of the air-conditioning electronic expansion valve monitoring device described below is only illustrative. Please refer to Figure 4 As shown in FIG, it is a structural diagram of an air-conditioning electronic expansion valve monitoring device provided by an embodiment of the present invention.

[0068] The air conditioner electronic expansion valve monitoring device of the present invention specifically includes the following parts:

[0069] The flow inflection point calibration unit 401 is used to determine the flow inflection point calibration interval of the air conditioner electronic expansion valve based on a preset flow inflection point calibration strategy of the air conditioner electronic expansion valve;

[0070] a flow inflection point adjustment determination unit 402, configured to determine that the air conditioner electronic expansion valve is to be adjusted within the flow inflection point calibration interval when it is monitored that the actual opening of the air conditioner electronic expansion valve reaches the flow inflection point calibration interval and the difference between the actual exhaust temperature of the air conditioner compressor and the target exhaust temperature is less than a preset temperature threshold;

[0071] The air conditioner electronic expansion valve control unit 403 is used to compare the exhaust temperature of the air conditioner at each opening operating state within the flow inflection point calibration interval with the target exhaust temperature, determine the target opening according to the size of the comparison difference, and control the air conditioner electronic expansion valve to operate at the target opening; wherein, the flow inflection point calibration interval includes the target opening.

[0072] Furthermore, before determining whether the air-conditioning electronic expansion valve is adjusted in the flow inflection point calibration interval, the method further includes: a target opening determination unit configured to:

[0073] Determine the target exhaust temperature corresponding to the air conditioner in different operating modes;

[0074] Obtaining the measured compressor exhaust temperature of the air conditioner in different operating modes;

[0075] determining a difference between the measured compressor exhaust temperature and the target exhaust temperature, and when the difference is less than the temperature threshold, entering a sampling monitoring mode; monitoring the compressor exhaust temperature and the corresponding air-conditioning electronic expansion valve opening during air-conditioning operation within a preset time range under the sampling monitoring mode, and determining a minimum compressor exhaust temperature and a maximum compressor exhaust temperature during air-conditioning operation within the time range based on the monitoring results, and determining a minimum opening and a maximum opening of the air-conditioning electronic expansion valve within the time range;

[0076] When the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature is greater than or equal to the temperature threshold, the air-conditioning system is determined to be in abnormal fluctuation, and the air-conditioning electronic expansion valve is controlled to operate for a preset time at the minimum opening, maximum opening and intermediate opening respectively, and the first exhaust temperature, second exhaust temperature and third exhaust temperature corresponding to the air-conditioning under the minimum opening condition are monitored respectively; from the first exhaust temperature, the second exhaust temperature and the third exhaust temperature, the exhaust temperature with the smallest difference from the target exhaust temperature is determined, and the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature is determined; wherein, the exhaust temperature is the first exhaust temperature, the second exhaust temperature or the third exhaust temperature; the target opening is the minimum opening, the maximum opening or the intermediate opening, and the intermediate opening is the average of the minimum opening and the maximum opening.

[0077] Furthermore, the flow inflection point calibration unit is specifically used to:

[0078] When it is initially determined that the air-conditioning system is in an abnormal fluctuation state, the air-conditioning electronic expansion valve flow inflection point calibration mode is entered; under the air-conditioning electronic expansion valve flow inflection point calibration mode conditions, the flow inflection point calibration mode range of the air-conditioning electronic expansion valve is determined according to the preset electronic expansion valve opening compensation value, the minimum opening and the maximum opening of the air-conditioning electronic expansion valve within the time range, and the opening of the air-conditioning electronic expansion valve is controlled to perform incremental testing according to the preset fixed opening value within the flow inflection point calibration mode range; the air-conditioning electronic expansion valve is operated for a preset time at each opening, the exhaust temperature after the air-conditioning is operated at each opening is recorded, and the flow inflection point calibration interval of the air-conditioning electronic expansion valve is determined according to the exhaust temperature change.

[0079] Furthermore, the flow inflection point calibration interval of the air conditioner electronic expansion valve is determined according to the exhaust temperature change, specifically including:

[0080] Based on the recorded exhaust temperature after the air conditioner is operated at each opening degree, the difference between every two adjacent exhaust temperatures is determined, and the flow inflection point calibration interval of the air conditioner electronic expansion valve is determined according to the difference between the adjacent exhaust temperatures.

[0081] Furthermore, the air conditioner electronic expansion valve control unit is specifically used to:

[0082] The air conditioner is controlled to operate at a minimum opening, a maximum opening, and an intermediate opening of the air conditioner electronic expansion valve for a preset time, and a plurality of exhaust temperatures corresponding to the minimum opening condition of the air conditioner are monitored respectively;

[0083] The multiple exhaust temperatures are compared with the target exhaust temperature respectively, and the exhaust temperature with the smallest difference from the target exhaust temperature is determined according to the comparison difference, and the opening corresponding to the exhaust temperature is determined as the target opening of the air conditioner electronic expansion valve.

[0084] Furthermore, the determination of the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature specifically includes: when there is a situation where the difference between two exhaust temperatures and the target exhaust temperature is the smallest, the opening corresponding to the two exhaust temperatures with the smaller difference between the current air-conditioning electronic expansion valve opening is determined as the target opening of the air-conditioning electronic expansion valve.

[0085] Furthermore, after determining that there are two exhaust temperatures with the smallest difference from the target exhaust temperature, it also includes: a target opening determination unit, which is used to detect the temperature of the indoor unit heat exchanger coil, and select the opening corresponding to the lower coil temperature as the target opening of the air-conditioning electronic expansion valve in the cooling operation mode, and select the opening corresponding to the higher coil temperature as the target opening of the air-conditioning electronic expansion valve in the heating operation mode.

[0086] The air-conditioning electronic expansion valve monitoring device described in the embodiment of the present invention determines the flow inflection point calibration interval of the air-conditioning electronic expansion valve through the air-conditioning electronic expansion valve flow inflection point calibration strategy. When it is monitored that the actual opening of the air-conditioning electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air-conditioning compressor and the target exhaust temperature is less than the preset temperature threshold, it is determined that the air-conditioning electronic expansion valve is adjusted at the flow inflection point calibration interval, and the exhaust temperature of the air-conditioning under each opening operating state within the flow inflection point calibration interval is compared with the target exhaust temperature respectively, and the target opening is determined according to the size of the comparison difference, and the air-conditioning electronic expansion valve is controlled to adjust to operate at the target opening, thereby effectively improving the stability of the air-conditioning during operation, avoiding abnormal fluctuations caused by passing through the flow inflection point during the air-conditioning temperature adjustment process, and greatly improving the user experience.

[0087] Corresponding to the above-mentioned air-conditioning electronic expansion valve monitoring method, the present invention also provides an electronic device. Since the embodiment of the electronic device is similar to the above-mentioned method embodiment, the description is relatively simple. For relevant details, please refer to the description of the above-mentioned method embodiment. The electronic device described below is only exemplary. Figure 5 , which is a schematic diagram of the physical structure of an electronic device disclosed in an embodiment of the present invention. The electronic device may include: a processor 501, a memory 502, a communication bus 503, and a search engine 505. The processor 501 and the memory 502 communicate with each other via the communication bus 503 and communicate with the outside world via a communication interface 504. The processor 501 can call the logic instructions in the memory 502 to execute the air-conditioning electronic expansion valve monitoring method, which includes: determining the flow inflection point calibration interval of the air-conditioning electronic expansion valve based on a preset air-conditioning electronic expansion valve flow inflection point calibration strategy; when it is monitored that the actual opening of the air-conditioning electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air-conditioning compressor and the target exhaust temperature is less than the preset temperature threshold, it is determined that the air-conditioning electronic expansion valve is adjusted at the flow inflection point calibration interval; the exhaust temperature of the air-conditioning under each opening operating state within the flow inflection point calibration interval is compared with the target exhaust temperature, the target opening is determined according to the size of the comparison difference, and the air-conditioning electronic expansion valve is controlled to adjust to operate at the target opening; wherein, the flow inflection point calibration interval includes the target opening.

[0088] In addition, the logic instructions in the above-mentioned memory 502 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: a memory chip, a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program code.

[0089] On the other hand, an embodiment of the present invention further provides a computer program product, comprising a computer program stored on a processor-readable storage medium, the computer program comprising program instructions. When the program instructions are executed by a computer, the computer is capable of executing the air conditioner electronic expansion valve monitoring method provided by each of the above-mentioned method embodiments. The method comprises: determining a flow inflection point calibration interval for the air conditioner electronic expansion valve based on a preset flow inflection point calibration strategy for the air conditioner electronic expansion valve; determining that the air conditioner electronic expansion valve is adjusted within the flow inflection point calibration interval when it is monitored that the actual opening of the air conditioner electronic expansion valve reaches the flow inflection point calibration interval and the difference between the actual exhaust temperature of the air conditioner compressor and the target exhaust temperature is less than a preset temperature threshold; comparing the exhaust temperature of the air conditioner at each opening operating state within the flow inflection point calibration interval with the target exhaust temperature, determining a target opening based on the comparison difference, and controlling the air conditioner electronic expansion valve to operate at the target opening; wherein the flow inflection point calibration interval includes the target opening.

[0090] In another aspect, an embodiment of the present invention further provides a processor-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program is implemented to execute the air conditioner electronic expansion valve monitoring method provided in each of the above embodiments. The method includes: determining a flow inflection point calibration interval of the air conditioner electronic expansion valve based on a preset flow inflection point calibration strategy for the air conditioner electronic expansion valve; when it is monitored that the actual opening of the air conditioner electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air conditioner compressor and the target exhaust temperature is less than a preset temperature threshold, determining that the air conditioner electronic expansion valve is adjusted within the flow inflection point calibration interval; comparing the exhaust temperature of the air conditioner at each opening operating state within the flow inflection point calibration interval with the target exhaust temperature, determining a target opening based on the size of the comparison difference, and controlling the air conditioner electronic expansion valve to operate at the target opening; wherein the flow inflection point calibration interval includes the target opening.

[0091] The processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROMs, EPROMs, EEPROMs, non-volatile memories (NANDFLASH), solid-state drives (SSDs)), etc.

[0092] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0093] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for monitoring an air conditioner electronic expansion valve, characterized in that: include: Determining a flow inflection point calibration interval of the air-conditioning electronic expansion valve based on a preset flow inflection point calibration strategy of the air-conditioning electronic expansion valve; When it is monitored that the actual opening of the air-conditioning electronic expansion valve reaches the flow inflection point calibration interval, and the difference between the actual exhaust temperature of the air-conditioning compressor and the target exhaust temperature is less than a preset temperature threshold, it is determined that the air-conditioning electronic expansion valve is adjusted in the flow inflection point calibration interval; comparing the exhaust temperatures of the air conditioner at each opening operating state within the flow inflection point calibration interval with the target exhaust temperature, determining a target opening according to the comparison difference, and controlling the air conditioner electronic expansion valve to operate at the target opening; wherein the flow inflection point calibration interval includes the target opening; Before determining that the air conditioner electronic expansion valve is adjusted within the flow inflection point calibration interval, the method further includes: Determine the target exhaust temperature corresponding to the air conditioner in different operating modes; Obtaining the measured compressor exhaust temperature of the air conditioner in different operating modes; determining a difference between the measured compressor exhaust temperature and the target exhaust temperature, and when the difference is less than the temperature threshold, entering a sampling monitoring mode; monitoring the compressor exhaust temperature and the corresponding air-conditioning electronic expansion valve opening during air-conditioning operation within a preset time range under the sampling monitoring mode, and determining a minimum compressor exhaust temperature and a maximum compressor exhaust temperature during air-conditioning operation within the time range based on the monitoring results, and determining a minimum opening and a maximum opening of the air-conditioning electronic expansion valve within the time range; When the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature is greater than or equal to the temperature threshold, the air conditioning system is determined to be in abnormal fluctuation, and the air conditioning electronic expansion valve is controlled to operate at a minimum opening, a maximum opening, and an intermediate opening for a preset time, and the three exhaust temperatures corresponding to the air conditioning under the three opening conditions are monitored respectively; from the three exhaust temperatures, the exhaust temperature with the smallest difference from the target exhaust temperature is determined, and a target opening of the air conditioning electronic expansion valve corresponding to the exhaust temperature is determined; wherein the target opening is the minimum opening, the maximum opening, or the intermediate opening, and the intermediate opening is the average of the minimum opening and the maximum opening; The method of determining the flow inflection point calibration interval of the air-conditioning electronic expansion valve based on the preset flow inflection point calibration strategy of the air-conditioning electronic expansion valve specifically includes: When it is initially determined that the air-conditioning system is in an abnormal fluctuation state, the air-conditioning electronic expansion valve flow inflection point calibration mode is entered; under the air-conditioning electronic expansion valve flow inflection point calibration mode conditions, the flow inflection point calibration mode range of the air-conditioning electronic expansion valve is determined according to the preset electronic expansion valve opening compensation value, the minimum opening and the maximum opening of the air-conditioning electronic expansion valve within the time range, and the opening of the air-conditioning electronic expansion valve is controlled to perform incremental testing according to the preset fixed opening value within the flow inflection point calibration mode range; the air-conditioning electronic expansion valve is operated for a preset time at each opening, the exhaust temperature after the air-conditioning is operated at each opening is recorded, and the flow inflection point calibration interval of the air-conditioning electronic expansion valve is determined according to the exhaust temperature change.

2. The air conditioner electronic expansion valve monitoring method according to claim 1, characterized in that: Determining the flow inflection point calibration interval of the air conditioner electronic expansion valve according to the exhaust temperature change specifically includes: Based on the recorded exhaust temperature after the air conditioner is operated at each opening degree, the difference between every two adjacent exhaust temperatures is determined, and the flow inflection point calibration interval of the air conditioner electronic expansion valve is determined according to the difference between the adjacent exhaust temperatures.

3. The air conditioner electronic expansion valve monitoring method according to claim 1, characterized in that: The step of comparing the exhaust temperatures of the air conditioner at each opening operating state within the flow inflection point calibration interval with the target exhaust temperatures and determining the target opening according to the comparison differences specifically includes: The air conditioner is controlled to operate at a minimum opening, a maximum opening, and an intermediate opening of the air conditioner electronic expansion valve for a preset time, and a plurality of exhaust temperatures corresponding to the minimum opening condition of the air conditioner are monitored respectively; The multiple exhaust temperatures are compared with the target exhaust temperature respectively, and the exhaust temperature with the smallest difference from the target exhaust temperature is determined according to the comparison difference, and the opening corresponding to the exhaust temperature is determined as the target opening of the air conditioner electronic expansion valve.

4. The air conditioner electronic expansion valve monitoring method according to claim 1, characterized in that: The determining of the target opening of the air-conditioning electronic expansion valve corresponding to the exhaust temperature specifically includes: when there is a minimum difference between two exhaust temperatures and the target exhaust temperature, determining the opening corresponding to the two exhaust temperatures with the smaller difference between the current opening of the air-conditioning electronic expansion valve as the target opening of the air-conditioning electronic expansion valve.

5. The air-conditioning electronic expansion valve monitoring method according to claim 4, characterized in that: After determining that there are two exhaust temperatures with the smallest difference from the target exhaust temperature, the method further includes: detecting the temperature of the indoor unit heat exchanger coil, selecting the opening corresponding to the lower coil temperature as the target opening of the air-conditioning electronic expansion valve in the cooling operation mode, and selecting the opening corresponding to the higher coil temperature as the target opening of the air-conditioning electronic expansion valve in the heating operation mode.

6. An air-conditioning electronic expansion valve monitoring device, characterized in that: include: A flow inflection point calibration unit, configured to determine a flow inflection point calibration interval of the air-conditioning electronic expansion valve based on a preset flow inflection point calibration strategy of the air-conditioning electronic expansion valve; a flow inflection point adjustment determination unit, configured to determine that the air conditioner electronic expansion valve is to be adjusted within the flow inflection point calibration interval when it is monitored that the actual opening of the air conditioner electronic expansion valve reaches the flow inflection point calibration interval and the difference between the actual exhaust temperature of the air conditioner compressor and the target exhaust temperature is less than a preset temperature threshold; an air conditioner electronic expansion valve control unit, configured to compare the exhaust gas temperature of the air conditioner at each opening degree operating state within the flow inflection point calibration interval with the target exhaust gas temperature, determine a target opening degree based on the comparison difference, and control the air conditioner electronic expansion valve to operate at the target opening degree; wherein the flow inflection point calibration interval includes the target opening degree; Before determining that the air conditioner electronic expansion valve is adjusted within the flow inflection point calibration interval, the method further includes: Determine the target exhaust temperature corresponding to the air conditioner in different operating modes; Obtaining the measured compressor exhaust temperature of the air conditioner in different operating modes; determining a difference between the measured compressor exhaust temperature and the target exhaust temperature, and when the difference is less than the temperature threshold, entering a sampling monitoring mode; monitoring the compressor exhaust temperature and the corresponding air-conditioning electronic expansion valve opening during air-conditioning operation within a preset time range under the sampling monitoring mode, and determining a minimum compressor exhaust temperature and a maximum compressor exhaust temperature during air-conditioning operation within the time range based on the monitoring results, and determining a minimum opening and a maximum opening of the air-conditioning electronic expansion valve within the time range; When the difference between the maximum compressor exhaust temperature and the minimum compressor exhaust temperature is greater than or equal to the temperature threshold, the air conditioning system is determined to be in abnormal fluctuation, and the air conditioning electronic expansion valve is controlled to operate at a minimum opening, a maximum opening, and an intermediate opening for a preset time, and the three exhaust temperatures corresponding to the air conditioning under the three opening conditions are monitored respectively; from the three exhaust temperatures, the exhaust temperature with the smallest difference from the target exhaust temperature is determined, and a target opening of the air conditioning electronic expansion valve corresponding to the exhaust temperature is determined; wherein the target opening is the minimum opening, the maximum opening, or the intermediate opening, and the intermediate opening is the average of the minimum opening and the maximum opening; The method of determining the flow inflection point calibration interval of the air-conditioning electronic expansion valve based on the preset flow inflection point calibration strategy of the air-conditioning electronic expansion valve specifically includes: When it is initially determined that the air-conditioning system is in an abnormal fluctuation state, the air-conditioning electronic expansion valve flow inflection point calibration mode is entered; under the air-conditioning electronic expansion valve flow inflection point calibration mode conditions, the flow inflection point calibration mode range of the air-conditioning electronic expansion valve is determined according to the preset electronic expansion valve opening compensation value, the minimum opening and the maximum opening of the air-conditioning electronic expansion valve within the time range, and the opening of the air-conditioning electronic expansion valve is controlled to perform incremental testing according to the preset fixed opening value within the flow inflection point calibration mode range; the air-conditioning electronic expansion valve is operated for a preset time at each opening, the exhaust temperature after the air-conditioning is operated at each opening is recorded, and the flow inflection point calibration interval of the air-conditioning electronic expansion valve is determined according to the exhaust temperature change.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the air-conditioning electronic expansion valve monitoring method according to any one of claims 1 to 5 are implemented.

8. A processor-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the air-conditioning electronic expansion valve monitoring method according to any one of claims 1 to 5 are implemented.

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