Electronic expansion valve control method, air conditioner and storage medium

Abstract

The invention provides an electronic expansion valve control method, an air conditioner and a storage medium, and the method comprises the steps that when a compressor operates, the motor temperature of a compressor motor is obtained; whether the temperature of the motor is in an unstable state or not is judged, if yes, a fitting curve of correlation between the opening degree of the electronic expansion valve and the input current of the motor is obtained, and the current opening degree of the electronic expansion valve corresponding to the current input current of the compressor motor is determined according to the fitting curve, fitting the opening degree of the electronic expansion valve and the input current of the motor or fitting the opening degree of the electronic expansion valve, the input current of the motor and the operation frequency; and controlling the electronic expansion valve to work according to the current opening of the electronic expansion valve. By means of the electronic expansion valve control method, the response speed can be increased, and the control stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular, to an electronic expansion valve control method, an air conditioner using the electronic expansion valve control method, and a computer-readable storage medium using the electronic expansion valve control method. Background Art

[0002] At present, variable frequency air conditioners mostly use electronic expansion valves as throttling devices, and electronic expansion valves have the advantages of sensitive action, high adjustment accuracy, large adjustment range, and stable adjustment. Reasonable and efficient control of electronic expansion valves is conducive to improving heat exchange efficiency and ensuring efficient and stable operation of the refrigeration system.

[0003] At present, the mainstream control method of electronic expansion valves is based on real-time temperature sampling for regulation and control. However, the change in temperature has a very large lag. It often takes several minutes or even longer to start adjusting the electronic expansion valve until the temperature stabilizes and no longer rises when the sampling determines that it is overheated. In severe cases, it may even cause the system to overheat and shut down, seriously affecting the stability of the system operation.

[0004] An existing electronic expansion valve control method uses the pressure difference and current of the compressor under preset standard conditions to obtain the current optimal opening fitting coefficient, and then uses the optimal opening of the electronic expansion valve under the preset standard conditions, combined with the current optimal opening fitting coefficient, to obtain the current optimal opening. The current opening of the electronic expansion valve is thereby regulated, which can achieve real-time and precise regulation, help to improve the regulation stability of the electronic expansion valve and shorten the regulation stabilization time of the refrigerant system.

[0005] However, in this solution, the calculation method of the current optimal opening fitting coefficient is relatively complicated and cannot directly reflect the opening requirement of the electronic expansion valve, which is prone to errors.

[0006] Therefore, a more optimized electronic expansion valve control method needs to be considered. Summary of the invention

[0007] The first object of the present invention is to provide an electronic expansion valve control method which can improve the response speed and increase the control stability.

[0008] A second object of the present invention is to provide an air conditioner which can improve response speed and increase control stability.

[0009] The third object of the present invention is to provide a computer-readable storage medium that can improve response speed and increase control stability.

[0010] In order to achieve the first purpose of the present invention, the electronic expansion valve control method provided by the present invention includes: when the compressor is running, obtaining the motor temperature of the compressor motor; judging whether the motor temperature is in an unstable state, and if so, obtaining a fitting curve related to the opening of the electronic expansion valve and the motor input current, and determining the current opening of the electronic expansion valve corresponding to the current input current of the compressor motor according to the fitting curve, wherein the fitting curve is obtained by fitting the opening of the electronic expansion valve and the motor input current or by fitting the opening of the electronic expansion valve, the motor input current and the operating frequency when the motor temperature is stable; and controlling the operation of the electronic expansion valve according to the current opening of the electronic expansion valve.

[0011] It can be seen from the above scheme that the electronic expansion valve control method of the present invention can accurately correspond to the appropriate current opening of the electronic expansion valve according to the actual current input current of the compressor motor by obtaining the fitting curve related to the opening of the electronic expansion valve and the motor input current when the motor temperature is stable. When the compressor is running, the motor temperature is obtained in real time to determine whether it is in an unstable state. Once it is determined to be in an unstable state, the opening is determined based on the fitting curve and the electronic expansion valve is controlled. The real-time motor input current is used to represent the real-time compressor motor temperature. According to the real-time temperature of the compressor motor, the opening of the electronic expansion valve can be dynamically adjusted accordingly, which helps to keep the entire refrigeration or heating system in a relatively good operating state at all times, ensure the stability of the system performance, avoid the imbalance of system operating parameters caused by changes in factors such as motor temperature, and effectively reduce the probability of system failure, enhance the stability and reliability of the overall operation of the system, and extend the service life of the equipment.

[0012] In a further scheme, when fitting the electronic expansion valve opening and the motor input current to obtain a fitting curve, the following steps are included: inputting a preset current into the compressor motor, adjusting the electronic expansion valve opening so that the motor temperature reaches a stable state, and recording the electronic expansion valve opening corresponding to the preset current; fitting according to multiple groups of different preset currents and corresponding electronic expansion valve openings to obtain a fitting curve.

[0013] It can be seen from this that inputting a preset current first to allow the motor temperature to reach a stable state to record data can eliminate the interference of unstable factors such as motor temperature fluctuations on the relationship between the opening of the electronic expansion valve and the motor input current to the greatest extent, making the subsequent fitted curve more scientific and accurately reflect the true correlation between the two.

[0014] In a further scheme, the step of adjusting the opening of the electronic expansion valve so that the motor temperature reaches a stable state includes: if the motor temperature is greater than the upper limit value of the preset temperature range, the opening of the electronic expansion valve is reduced; if the motor temperature is less than the lower limit value of the preset temperature range, the opening of the electronic expansion valve is increased.

[0015] It can be seen that by comparing the relationship between the motor temperature and the upper and lower limits of the preset temperature range, it is decided whether to increase or decrease the opening of the electronic expansion valve. According to the specific deviation of the motor temperature, the corresponding adjustment action can be taken accurately, avoiding blind operation, and helping to more efficiently change the motor temperature in a stable direction, and finally make it fall within the preset temperature range.

[0016] In a further solution, fitting is performed based on multiple sets of different preset currents and corresponding electronic expansion valve openings, and the step of obtaining a fitting curve includes: obtaining multiple sets of electronic expansion valve openings under the same preset current, and performing curve fitting based on the average value of the electronic expansion valve openings.

[0017] It can be seen that curve fitting based on more accurate data after averaging can help improve the accuracy of fitting. It avoids unreasonable fluctuations or distortions in the fitting curve caused by individual abnormal data points. The final fitting curve will be smoother and more stable.

[0018] In a further scheme, when fitting the electronic expansion valve opening, motor input current and operating frequency to obtain a fitting curve, the following steps are included: inputting a preset current and a preset operating frequency to the compressor motor, adjusting the electronic expansion valve opening so that the motor temperature reaches a stable state, and recording the corresponding electronic expansion valve opening under the preset current and preset operating frequency; fitting according to multiple groups of different preset currents, preset operating frequencies and corresponding electronic expansion valve openings to obtain a fitting curve.

[0019] It can be seen that in the actual operation of the compressor, the change of the operating frequency will have a significant impact on the working state of the motor and the performance of the entire refrigeration or heating system, and is closely related to the opening of the electronic expansion valve and the motor input current. By comprehensively considering these three factors, the relationship between the parameters under different working conditions can be more comprehensively reflected, so that the subsequent electronic expansion valve control based on the fitting curve can better adapt to a variety of complex actual operation scenarios, and improve the comprehensiveness of the control strategy.

[0020] In a further solution, when the fluctuation range value of the motor temperature is less than or equal to the preset fluctuation range value, it is determined that the motor temperature is in a stable state.

[0021] It can be seen that when the motor temperature is stable, the fluctuation is small. Therefore, it is possible to determine whether the motor temperature is in a stable state by presetting the fluctuation range value.

[0022] In a further solution, the step of controlling the operation of the electronic expansion valve according to the current opening of the electronic expansion valve includes: controlling the valve opening rate of the electronic expansion valve according to the fluctuation range value of the motor temperature, and the fluctuation range value is positively correlated with the valve opening rate.

[0023] It can be seen that by establishing a positive correlation between the opening rate of the electronic expansion valve and the fluctuation range of the motor temperature, a real-time dynamic response to the change of the motor temperature is achieved.

[0024] In a further solution, the fitting curve is updated at every preset time interval.

[0025] It can be seen that as the compressor and other equipment continue to operate, their internal mechanical properties, electrical characteristics, and external working environment factors will change, and these changes will affect the relationship between parameters such as the opening of the electronic expansion valve, the motor input current, and the operating frequency. By updating the fitting curve at each preset interval, these changes can be tracked in a timely manner, so that the fitting curve is always close to the actual operating conditions of the equipment, ensuring that the subsequent control of the electronic expansion valve based on the curve is more accurate, and effectively avoiding the situation where the control is greatly deviated from the actual demand due to the long-term use of a fixed curve.

[0026] In order to achieve the second objective of the present invention, the present invention provides a motor including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the above-mentioned electronic expansion valve control method are implemented.

[0027] In order to achieve the third objective of the present invention, the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a controller, the steps of the above-mentioned electronic expansion valve control method are implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flow chart of an embodiment of the electronic expansion valve control method of the present invention.

[0029] Figure 2 It is a flow chart of the steps of fitting the opening of the electronic expansion valve and the motor input current to obtain the fitting curve in the embodiment of the electronic expansion valve control method of the present invention.

[0030] Figure 3 It is a flow chart of the steps of fitting the electronic expansion valve opening, motor input current and operating frequency to obtain the fitting curve in the embodiment of the electronic expansion valve control method of the present invention.

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0032] Electronic expansion valve control method embodiment:

[0033] The electronic expansion valve control method of the present invention is a computer program applied to an air conditioner and is used to control the electronic expansion valve in the air conditioner.

[0034] like Figure 1As shown, in this embodiment, when the electronic expansion valve control method is working, first, step S1 is executed to obtain the motor temperature of the compressor motor when the compressor is running. When the compressor is running under different working conditions, factors such as the motor load, speed, and refrigerant flow rate will change, and these changes will affect the motor temperature. By obtaining the motor temperature in real time, it is possible to judge whether the various system parameters are within a reasonable range under the current working conditions based on the temperature value, thereby providing key basic data for subsequent related control operations such as the opening of the electronic expansion valve.

[0035] After obtaining the motor temperature of the compressor motor, execute step S2 to determine whether the motor temperature is in an unstable state. By dividing the operation process of the compressor motor into a stable stage and an unstable stage, it is helpful to accurately grasp the state of the system at different times, because in a stable state, the relationship between various related parameters (such as the opening of the electronic expansion valve, the motor input current, etc.) is relatively fixed and conforms to the normal operation law, while in an unstable state, it means that the system may be experiencing situations such as startup, load mutation, and sudden change in ambient temperature. The parameters need to be adjusted accordingly to re-balance. In this embodiment, when the fluctuation range value of the motor temperature is less than or equal to the preset fluctuation range value, it is determined that the motor temperature is in a stable state. Among them, the preset fluctuation range value can be pre-set according to experimental data. Preferably, the preset fluctuation range value is 5°C. When the motor temperature is stable, the fluctuation is small. Therefore, it can be determined whether the motor temperature is in a stable state by the preset fluctuation range value.

[0036] If the motor temperature is in a stable state, continue to execute step S2, maintain the current operating state of the compressor motor, and continue to detect the motor temperature. If the motor temperature is in an unstable state, execute step S3 to obtain a fitting curve related to the opening of the electronic expansion valve and the motor input current, and determine the current opening of the electronic expansion valve corresponding to the current input current of the compressor motor according to the fitting curve. Among them, the fitting curve is obtained by fitting the opening of the electronic expansion valve and the motor input current when the motor temperature is stable, or by fitting the opening of the electronic expansion valve, the motor input current and the operating frequency. In order to control the electronic expansion valve, the current opening of the corresponding electronic expansion valve is obtained by the current input current, or the current opening of the corresponding electronic expansion valve is obtained by the current motor input current and the current operating frequency, so as to improve the accuracy of the control. Since the fitting curve is obtained when the motor temperature is stable, this also helps to reduce the interference of the motor temperature fluctuation on the control of the electronic expansion valve. Unstable motor temperature may cause changes in motor performance, thereby affecting parameters such as the motor input current. However, by taking the fitting curve under stable state as the basis, the influence of these unstable factors can be filtered out to a certain extent, making the control of the opening of the electronic expansion valve more reliable, thereby reducing the system performance fluctuation caused by temperature fluctuation and enhancing the stability of the system.

[0037] See also Figure 2 In this embodiment, when fitting the electronic expansion valve opening and the motor input current to obtain a fitting curve, first, execute step S11, input a preset current to the compressor motor, adjust the electronic expansion valve opening so that the motor temperature reaches a stable state, and record the electronic expansion valve opening corresponding to the preset current. The selection of the preset current can be determined based on the design parameters of the compressor, the common operating conditions range, or specific experimental requirements. For example, according to the standard current value corresponding to the compressor under different cooling or heating power requirements, several representative current values ​​are selected as the preset current, which paves the way for subsequent exploration of the changes and mutual relationships of various system parameters under these specific current input conditions.

[0038] After inputting the preset current, the working state of the motor will change accordingly, which will in turn affect the motor temperature and other related parameters. At this time, it is necessary to adjust the opening of the electronic expansion valve to adjust the system in order to make the motor temperature reach a stable state. There is a close dependence between the adjustment of the electronic expansion valve opening and the motor temperature: when the motor temperature is higher than the expected stable range, it means that the current refrigerant flow may be too large, resulting in an increased heat dissipation burden on the motor. It is necessary to reduce the opening of the electronic expansion valve to reduce the refrigerant flow, thereby reducing the heat generation of the motor and causing the motor temperature to drop; conversely, if the motor temperature is lower than the stable range, it means that the refrigerant flow may be insufficient and cannot provide sufficient heat dissipation protection for the motor. In this case, it is necessary to increase the opening of the electronic expansion valve and increase the refrigerant flow to increase the motor temperature.

[0039] In this embodiment, the step of adjusting the opening of the electronic expansion valve so that the motor temperature reaches a stable state includes: if the motor temperature is greater than the upper limit of the preset temperature range, the opening of the electronic expansion valve is reduced; if the motor temperature is less than the lower limit of the preset temperature range, the opening of the electronic expansion valve is increased. By comparing the relationship between the motor temperature and the upper and lower limits of the preset temperature range, it is determined whether to increase or decrease the opening of the electronic expansion valve. According to the specific deviation of the motor temperature, the corresponding adjustment action can be accurately taken, avoiding blind operation, and helping to more efficiently change the motor temperature in a stable direction, and finally making it fall within the preset temperature range.

[0040] When the motor temperature successfully reaches a stable state, the corresponding electronic expansion valve opening is recorded. The recorded data will become the basic material for subsequent analysis, fitting and other work. Each set of preset current and its corresponding electronic expansion valve opening data in a stable state represents the parameter matching situation under a specific working condition.

[0041] After recording the electronic expansion valve opening corresponding to the preset current, step S12 is executed to fit the multiple sets of different preset currents and the corresponding electronic expansion valve openings to obtain a fitting curve. By changing the preset current multiple times and repeating the above adjustment and stabilization process, and collecting multiple sets of different data, the general trend of the electronic expansion valve opening changing with the motor input current can be depicted through these data, and then an accurate quantitative relationship model between the two can be constructed, so as to provide strong data support for accurately controlling the electronic expansion valve opening according to the model regardless of the real-time state of the motor in the actual compressor operation.

[0042] In this embodiment, fitting is performed based on multiple sets of different preset currents and corresponding electronic expansion valve openings, and the step of obtaining a fitting curve includes: obtaining multiple sets of electronic expansion valve openings under the same preset current, and performing curve fitting based on the average value of the electronic expansion valve openings. By obtaining the electronic expansion valve openings for the same preset current multiple times, and then averaging the multiple obtained electronic expansion valve openings, and performing curve fitting based on more accurate data after averaging, it is helpful to improve the accuracy of fitting. It avoids unreasonable fluctuations or distortions in the fitting curve caused by individual abnormal data points. The final fitting curve will be smoother and more stable.

[0043] In another embodiment, when fitting the electronic expansion valve opening, motor input current and operating frequency to obtain a fitting curve, step S21 is first executed to input a preset current and a preset operating frequency to the compressor motor, adjust the electronic expansion valve opening so that the motor temperature reaches a stable state, and record the corresponding electronic expansion valve opening at the preset current and the preset operating frequency.

[0044] In the actual operation of the compressor, the two parameters of motor input current and operating frequency are often interrelated and jointly affect the overall operating status of the system. The input preset current determines the load size and power consumption of the motor, while the preset operating frequency reflects the operating speed of the compressor and the cooling or heating capabilities. By setting these two parameters at the same time, the working status of the compressor under different actual working conditions can be more comprehensively and realistically simulated.

[0045] After the preset current and preset operating frequency are given, the heating condition of the motor, the load condition and the demand for refrigerant flow of the entire system will change accordingly. At this time, adjust the opening of the electronic expansion valve to seek a dynamic balance. If the motor temperature is too high, it means that the current refrigerant flow may not meet the heat dissipation requirements or the system load is too heavy, then it is necessary to increase the opening of the electronic expansion valve to increase the refrigerant flow, help the motor dissipate heat, and promote the temperature to drop; conversely, if the motor temperature is too low, it is necessary to reduce the opening and reduce the refrigerant flow to avoid problems such as excessive cooling that affect the normal operation of the motor and system performance. This adjustment process requires continuous observation of the changes in motor temperature and repeated fine-tuning of the opening until the motor temperature stabilizes in an appropriate range, thereby ensuring a coordinated and adaptive state between the parameters and maintaining stable operation of the system.

[0046] When the motor temperature reaches a stable state, the corresponding electronic expansion valve opening under the preset current and preset operating frequency is recorded. Each set of such data represents the matching between various parameters under a specific working condition. By accumulating multiple sets of different current, frequency and corresponding opening data, it is like building a "database" that reflects the operating rules of the system, from which the inherent and quantitative relationship between various parameters can be mined, providing rich materials for accurately describing the changing rules between the electronic expansion valve opening, motor input current and operating frequency.

[0047] After recording the corresponding electronic expansion valve opening under the preset current and the preset operating frequency, step S22 is executed to perform fitting according to multiple sets of different preset currents, preset operating frequencies and corresponding electronic expansion valve openings to obtain a fitting curve. When fitting, it is necessary to use appropriate mathematical methods to process these multivariate data, such as multivariate linear regression, polynomial fitting or fitting methods based on machine learning algorithms.

[0048] In addition, in this embodiment, the fitting curve is updated at every preset time interval. The preset time can be preset according to experimental data, for example, the preset time is 3 months. As the compressor and other equipment continue to operate, its internal mechanical properties, electrical characteristics and external working environment and other factors will change, these changes will affect the relationship between parameters such as the opening of the electronic expansion valve, the motor input current and the operating frequency. By updating the fitting curve at every preset time interval, these changes can be tracked in time, so that the fitting curve is always close to the actual operating conditions of the equipment, ensuring that the subsequent control of the electronic expansion valve based on the curve is more accurate, and effectively avoiding the situation where the control is greatly deviated from the actual demand due to the long-term use of a fixed curve.

[0049] After obtaining the fitting curve related to the opening of the electronic expansion valve and the motor input current, the current opening of the electronic expansion valve corresponding to the current input current of the compressor motor can be determined according to the fitting curve.

[0050] After obtaining the current opening of the electronic expansion valve, execute step S4 to control the operation of the electronic expansion valve according to the current opening of the electronic expansion valve. By controlling according to the determined current opening of the electronic expansion valve, the actual opening of the electronic expansion valve can be accurately matched with the real-time working condition of the compressor motor. For example, under different cooling or heating requirements, the input current, operating frequency and other parameters of the motor will change, and the corresponding electronic expansion valve needs to have a suitable opening to adjust the refrigerant flow. Controlling according to the current opening can ensure that the refrigerant flow is at a reasonable level that can meet the current system cooling or heating requirements, maintain the normal operating temperature of the motor, and ensure stable and efficient operation of the entire system.

[0051] In this embodiment, the step of controlling the operation of the electronic expansion valve according to the current opening of the electronic expansion valve includes: controlling the valve opening rate of the electronic expansion valve according to the fluctuation range value of the motor temperature, and the fluctuation range value is positively correlated with the valve opening rate. By establishing a positive correlation between the valve opening rate of the electronic expansion valve and the fluctuation range value of the motor temperature, the adjustment of the opening of the electronic expansion valve can respond to the dynamic changes of the motor temperature in real time and accurately. When the fluctuation range value of the motor temperature increases, it means that the operating conditions of the system change more obviously, which may be affected by factors such as sudden load changes and sudden changes in ambient temperature. At this time, speeding up the valve opening rate can allow the electronic expansion valve to quickly adjust the opening, thereby changing the refrigerant flow in time, effectively regulating the motor temperature, and restoring it to a stable state as soon as possible; and when the fluctuation range value is small, it means that the system is relatively stable, and appropriately slowing down the valve opening rate can achieve more precise and stable opening adjustment, avoiding new unstable factors caused by excessive adjustment. This method of flexibly adjusting the rate according to temperature fluctuations ensures that the opening adjustment is closely adapted to the actual working conditions.

[0052] As can be seen from the above, the electronic expansion valve control method of the present invention can accurately correspond to the appropriate current opening of the electronic expansion valve according to the actual current input current of the compressor motor by obtaining the fitting curve related to the opening of the electronic expansion valve and the motor input current when the motor temperature is stable. When the compressor is running, the motor temperature is obtained in real time to determine whether it is in an unstable state. Once it is determined to be in an unstable state, the opening is determined based on the fitting curve and the electronic expansion valve is controlled. The opening of the electronic expansion valve can be dynamically adjusted according to the real-time temperature of the compressor motor, which helps to keep the entire refrigeration or heating system in a relatively good operating state at all times, ensure the stability of the system performance, avoid the imbalance of system operating parameters caused by changes in factors such as motor temperature, and effectively reduce the probability of system failure, enhance the stability and reliability of the overall operation of the system, and extend the service life of the equipment.

[0053] Air conditioner embodiment:

[0054] The air conditioner of this embodiment includes a controller, and the controller implements the steps in the above-mentioned electronic expansion valve control method embodiment when executing a computer program.

[0055] For example, the computer program can be divided into one or more modules, one or more modules are stored in the memory and executed by the controller to complete the present invention. One or more modules can be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the air conditioner.

[0056] The air conditioner may include, but is not limited to, a controller and a memory. Those skilled in the art will appreciate that the air conditioner may include more or fewer components, or a combination of certain components, or different components, for example, the air conditioner may also include input and output devices, network access devices, buses, etc.

[0057] For example, the controller may be a central processing unit (CPU), other general controllers, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general controller may be a microcontroller or any conventional controller, etc. The controller is the control center of the air conditioner, and uses various interfaces and lines to connect the various parts of the entire air conditioner.

[0058] The memory can be used to store computer programs and / or modules. The controller realizes various functions of the air conditioner by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. For example, the memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound receiving function, a sound conversion to text function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, text data, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0059] Computer readable storage medium embodiment:

[0060] If the module integrated in the air conditioner of the above embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the implementation of all or part of the process in the above electronic expansion valve control method embodiment can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the controller, the steps of the above electronic expansion valve control method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The storage medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signal and telecommunication signal.

[0061] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto, and any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. An electronic expansion valve control method, characterized in that: include: When the compressor is running, the motor temperature of the compressor motor is obtained; Determine whether the motor temperature is in an unstable state, and if so, obtain a fitting curve related to the opening of the electronic expansion valve and the motor input current, and determine the current opening of the electronic expansion valve corresponding to the current input current of the compressor motor according to the fitting curve, wherein the fitting curve is obtained by fitting the opening of the electronic expansion valve and the motor input current when the motor temperature is in a stable state, or by fitting the opening of the electronic expansion valve, the motor input current and the operating frequency; The operation of the electronic expansion valve is controlled according to the current opening degree of the electronic expansion valve.

2. The electronic expansion valve control method according to claim 1, characterized in that: When fitting the opening of the electronic expansion valve and the motor input current to obtain the fitting curve, the following steps are included: Inputting a preset current into the compressor motor, adjusting the opening of the electronic expansion valve so that the motor temperature reaches a stable state, and recording the opening of the electronic expansion valve corresponding to the preset current; The fitting curve is obtained by performing fitting according to a plurality of different sets of the preset currents and the corresponding openings of the electronic expansion valves.

3. The electronic expansion valve control method according to claim 2, characterized in that: The step of adjusting the opening of the electronic expansion valve so that the motor temperature reaches a stable state comprises: If the motor temperature is greater than an upper limit of a preset temperature range, the opening of the electronic expansion valve is reduced; If the motor temperature is lower than the lower limit of the preset temperature range, the opening of the electronic expansion valve is increased.

4. The electronic expansion valve control method according to claim 2, characterized in that: The step of fitting the fitting curve according to a plurality of different sets of the preset currents and the corresponding electronic expansion valve openings comprises: A plurality of groups of electronic expansion valve openings under the same preset current are obtained, and curve fitting is performed according to an average value of the electronic expansion valve openings.

5. The electronic expansion valve control method according to claim 1, characterized in that: When fitting the opening of the electronic expansion valve, the motor input current and the operating frequency to obtain the fitting curve, the following steps are included: Inputting a preset current and a preset operating frequency into the compressor motor, adjusting the opening of the electronic expansion valve so that the motor temperature reaches a stable state, and recording the opening of the electronic expansion valve corresponding to the preset current and the preset operating frequency; The fitting curve is obtained by performing fitting according to a plurality of different groups of the preset currents, the preset operating frequencies and the corresponding openings of the electronic expansion valves.

6. The electronic expansion valve control method according to any one of claims 1 to 5, characterized in that: When the fluctuation range value of the motor temperature is less than or equal to the preset fluctuation range value, it is determined that the motor temperature is in a stable state.

7. The electronic expansion valve control method according to any one of claims 1 to 5, characterized in that: The step of controlling the operation of the electronic expansion valve according to the current opening of the electronic expansion valve comprises: The valve opening rate of the electronic expansion valve is controlled according to the fluctuation range value of the motor temperature, and the fluctuation range value is positively correlated with the valve opening rate.

8. The electronic expansion valve control method according to any one of claims 1 to 5, characterized in that: The fitting curve is updated at every preset time interval.

9. An air conditioner, comprising a processor and a memory, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the steps of the electronic expansion valve control method according to any one of claims 1 to 8 are implemented.

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

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