Electronic expansion valve control method, device, equipment and storage medium

Abstract

The electronic expansion valve control method, device, equipment and storage medium provided by the embodiment of the application relate to the technical field of heat pump control, and the method comprises the following steps: acquiring the ambient temperature and the discharge temperature and the compressor frequency of the compressor in real time; if the ambient temperature exceeds the preset upper limit value within the first preset time length, it is determined that the auxiliary control function of the electronic expansion valve is started, and the discharge temperature and the compressor frequency are monitored; when the discharge temperature is less than the preset temperature value and the compressor frequency is within the preset frequency range, the discharge superheat degree is determined based on the compressor frequency, the ambient temperature and the discharge temperature; and according to the temperature interval in which the discharge superheat degree is located, the corresponding opening degree adjustment strategy is executed on the electronic expansion valve. The scheme can provide a control strategy for adjusting the opening degree of the electronic expansion valve, effectively reduces the risk of liquid return of the heat pump system, and enables the system to operate more stably.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of heat pump control technology, and in particular to an electronic expansion valve control method, device, equipment, and storage medium. Background Art

[0002] Heat pump systems typically include a compressor, condenser, electronic expansion valve, and evaporator. The electronic expansion valve throttles the refrigerant flow into the evaporator. With increasing demands for energy conservation and environmental protection, controlling the opening of the electronic expansion valve is gaining increasing attention to further improve the energy efficiency of heat pump systems.

[0003] In related technologies, the opening control of the electronic expansion valve is usually adjusted according to the exhaust gas. For example, the opening of the electronic expansion valve is adjusted according to the judgment of the return air superheat. However, when the compressor is running at medium and low frequencies, the heat pump system's judgment of the return air superheat is not accurate enough, resulting in poor adjustment of the opening of the electronic expansion valve, which can easily lead to liquid return failure in the heat pump system and affect the stability of the system operation. Summary of the Invention

[0004] The embodiments of the present application provide an electronic expansion valve control method, device, equipment and storage medium, which can provide a control strategy for adjusting the opening of the electronic expansion valve, effectively reducing the risk of liquid backflow in the heat pump system, and enabling the system to operate more stably.

[0005] In a first aspect, an embodiment of the present application provides an electronic expansion valve control method, which is applied to a heat pump system. The heat pump system includes a compressor, a condenser, an electronic expansion valve, and an evaporator. When the heat pump system is in heating mode, the electronic expansion valve control method includes:

[0006] Real-time acquisition of ambient temperature, compressor exhaust temperature and compressor frequency;

[0007] If the ambient temperature exceeds the preset upper limit within the first preset time period, the auxiliary control function of the electronic expansion valve is activated to monitor the exhaust temperature and the compressor frequency;

[0008] When the exhaust gas temperature is less than a preset temperature value and the compressor frequency is within a preset frequency range, the exhaust gas superheat is determined based on the ambient temperature and the exhaust gas temperature;

[0009] According to the temperature range of the exhaust gas superheat, the corresponding opening adjustment strategy is implemented for the electronic expansion valve.

[0010] In a second aspect, an embodiment of the present application further provides an electronic expansion valve control device, the device comprising:

[0011] A parameter acquisition module configured to acquire the ambient temperature, the exhaust temperature of the compressor, and the compressor frequency in real time;

[0012] a parameter monitoring module configured to, if the ambient temperature exceeds a preset upper limit within a first preset time period, determine to activate an auxiliary control function of the electronic expansion valve and monitor the exhaust temperature and the compressor frequency;

[0013] a parameter determination module configured to determine an exhaust gas superheat based on an ambient temperature and an exhaust gas temperature when the exhaust gas temperature is less than a preset temperature value and the compressor frequency is within a preset frequency range;

[0014] The opening adjustment module is configured to execute a corresponding opening adjustment strategy for the electronic expansion valve according to the temperature range of the exhaust gas superheat.

[0015] In a third aspect, an embodiment of the present application further provides an electronic device, the device comprising:

[0016] one or more processors;

[0017] a storage device for storing one or more programs,

[0018] When one or more programs are executed by one or more processors, the one or more processors implement the electronic expansion valve control method in the above aspects.

[0019] In a fourth aspect, an embodiment of the present application further provides a storage medium storing computer-executable instructions, which, when executed by a processor, are used to execute the electronic expansion valve control method of the above aspect.

[0020] This application obtains corresponding parameters such as ambient temperature, compressor frequency, and exhaust temperature. After turning on the auxiliary control function, it implements different opening adjustment strategies for the electronic expansion valve according to the temperature range of the corresponding exhaust superheat. This application sets different opening adjustment strategies for different temperature ranges, responds to the corresponding opening adjustment strategy according to the range of exhaust superheat, and effectively controls the opening, thereby effectively reducing the risk of liquid backflow in the system and enabling more stable system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flowchart of the steps of the electronic expansion valve control method provided in an embodiment of the present application;

[0022] Figure 2 A control flow chart provided for an embodiment of the present application;

[0023] Figure 3 A schematic diagram of an electronic expansion valve control device provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended to explain the present application, not to limit it. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present application, not all structures.

[0026] It should be noted that due to space limitations, this application specification does not enumerate all optional implementation methods. After reading this application specification, those skilled in the art should be able to understand that as long as the technical features do not contradict each other, any combination of technical features can constitute an optional implementation method.

[0027] It should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity, operation, or object from another entity, operation, or object, and do not necessarily require or imply the existence of any actual relationship or order between these entities, operations, or objects. For example, the "first" and "second" in the first preset duration and the second preset duration are used to distinguish two different preset durations. In addition, in the description of this document, "plurality" means two or more.

[0028] In a heat pump system, when the heat pump system is in heating mode and the compressor is running at a medium or low frequency, the scheme of controlling the opening of the electronic expansion valve based on the return air superheat is very likely to increase the risk of liquid flooding due to the inaccurate judgment of the return air superheat by the heat pump system. Therefore, the embodiment of the present application provides an electronic expansion valve control method, which can be used to control the opening of the electronic expansion valve, such as Figure 1 As shown, Figure 1 This is a flowchart of the steps of the electronic expansion valve control method provided in an embodiment of the present application. The method includes the following steps:

[0029] Step S110: Acquire the ambient temperature, the exhaust temperature of the compressor, and the compressor frequency in real time.

[0030] For obtaining the above parameters, the corresponding parameter values ​​can be obtained through sensors and other detection devices. Similarly, the corresponding parameter values ​​can also be obtained by using the detection method of the above parameters in related technologies. This application does not limit this, and it is sufficient to obtain the corresponding parameter values.

[0031] Step S120: If the ambient temperature exceeds the preset upper limit within the first preset time period, it is determined to start the auxiliary control function of the electronic expansion valve and monitor the exhaust temperature and the compressor frequency.

[0032] If the detected ambient temperature exceeds a preset upper limit within a first preset duration (i.e., the ambient temperature is greater than or equal to the preset upper limit), an auxiliary control function is activated for the electronic expansion valve in the heat pump system. This auxiliary control function is used to adjust the opening of the electronic expansion valve. After the auxiliary control function is activated, the exhaust temperature and compressor frequency are also monitored to determine whether the corresponding preset conditions are met. It should be noted that the first preset duration is a pre-set determination period for whether the ambient temperature exceeds the preset upper limit.

[0033] Step S130: When the exhaust temperature is less than a preset temperature value and the compressor frequency is within a preset frequency range, the exhaust superheat is determined based on the compressor frequency, the ambient temperature, and the exhaust temperature.

[0034] It can be imagined that the preset conditions are that the exhaust temperature is less than the preset temperature value and the compressor frequency is within the preset frequency range, that is, only when the monitored exhaust temperature and compressor frequency meet the above conditions, the opening of the electronic expansion valve is adjusted and controlled based on the exhaust superheat.

[0035] In some embodiments, the exhaust superheat is determined based on the ambient temperature and the exhaust temperature. A first mapping relationship exists between the compressor frequency and the frequency base, i.e., each compressor frequency corresponds to a frequency base. Therefore, based on this first mapping relationship, a target frequency base corresponding to the current compressor frequency can be determined.

[0036] Similarly, corresponding to the ambient temperature, there is a second mapping relationship between the ambient temperature and the ambient temperature base, that is, each ambient temperature corresponds to an ambient temperature base. Therefore, based on the second mapping relationship, the target ambient temperature base corresponding to the current compressor frequency can be determined.

[0037] After determining the corresponding target frequency base and target ambient temperature base, combined with the preset compensation base, the compensation value can be calculated by multiplying the target frequency base, target ambient temperature base, and compensation base. Furthermore, based on the compensation value, the corresponding compensation temperature can also be determined. Specifically, the compensation temperature can be the sum of the compensation value and the condenser water outlet temperature. Therefore, the exhaust superheat value is the difference between the exhaust temperature and the compensation temperature.

[0038] It should be noted that for the compressor frequency within the preset frequency range, it changes linearly with the frequency base. Similarly, for the ambient temperature within the preset ambient temperature range, it changes linearly with the ambient temperature base.

[0039] Step S140: Execute a corresponding opening adjustment strategy for the electronic expansion valve according to the temperature range of the exhaust gas superheat.

[0040] The temperature value is pre-divided into multiple temperature ranges, and each temperature range corresponds to a different opening adjustment strategy for the electronic expansion valve. For example, if three temperature ranges are pre-divided, after determining the exhaust superheat, the corresponding opening adjustment strategy can be determined based on the temperature range in which the exhaust superheat falls.

[0041] In some embodiments, the temperature interval includes a first temperature interval, a second temperature interval, and a third temperature interval, wherein the temperature value of the first temperature interval is less than the first preset temperature, the temperature value of the second temperature interval is greater than or equal to the first preset temperature and less than the second preset temperature, and the temperature value of the third temperature interval is greater than or equal to the second preset temperature. It is conceivable that the first preset temperature and the second preset temperature are dividing values ​​between the temperature intervals.

[0042] When the exhaust superheat is in the first temperature range, the electronic expansion valve is adjusted according to PID (Proportion, Integration, Differentiation) based on the exhaust superheat, so as to determine the adjustment opening of the electronic expansion valve (such as the corresponding step) according to the corresponding calculation result; when the exhaust superheat is in the second temperature range, the opening of the electronic expansion valve is stopped from being adjusted, that is, within the second temperature range, the corresponding opening adjustment strategy is not to adjust the electronic expansion valve; when the exhaust superheat is in the third temperature range, the opening of the electronic expansion valve is adjusted according to the first preset step, and the interval between two adjacent adjustments is the second preset time length, that is, the opening of the electronic expansion valve is adjusted once every second preset time length, and the step of each adjustment is the first preset step.

[0043] As can be seen from the above scheme, this application obtains corresponding parameters, such as ambient temperature, compressor frequency, and exhaust temperature, and after turning on the auxiliary control function, implements different opening adjustment strategies for the electronic expansion valve according to the temperature range of the corresponding exhaust superheat. This application sets different opening adjustment strategies for different temperature ranges, responds to the corresponding opening adjustment strategy according to the range of exhaust superheat, and effectively controls the opening, thereby effectively reducing the risk of liquid backflow in the system and enabling more stable system operation.

[0044] In some embodiments, during the PID adjustment of the electronic expansion valve, a proportional parameter value, an integral parameter value, and a differential parameter value are preset, which are used to determine the corresponding target output step.

[0045] The exhaust difference is the difference between the exhaust superheat and the preset superheat; the temperature error cumulative value is the cumulative sum of the exhaust difference corresponding to each PID adjustment; the temperature difference is the difference between the exhaust difference corresponding to this PID adjustment and the exhaust difference corresponding to the previous PID adjustment.

[0046] After determining the corresponding exhaust difference, temperature error cumulative value, and temperature difference, the proportional parameter value is multiplied by the exhaust difference, the integral parameter value is multiplied by the temperature error cumulative value, and the differential parameter value is multiplied by the temperature difference, and the sum of the above products is used as the target output step.

[0047] After determining the target output step, the actual output step for this PID adjustment must be determined based on the historical output step corresponding to the previous PID adjustment. The actual output step is the sum of the target output step and the historical output step. It should be noted that the data generated by each PID adjustment (such as the output step, exhaust difference, etc.) is recorded in the storage device.

[0048] In each PID adjustment, the step output by this PID adjustment is determined in combination with the preset parameter values, current detection data and historical data, so that the opening of the electronic expansion valve is adjusted with this step. That is, by adjusting the opening according to the quantitative opening adjustment strategy, the opening of the electronic expansion valve is adjusted with the corresponding step, thereby achieving the effect of reducing the risk of liquid backflow.

[0049] It should be noted that the target output step is within the preset step range, meaning that both the maximum and minimum values ​​of the target output step are limited by the preset step range. It is conceivable that when the target output step value is not within the preset step range, its corresponding value is the maximum or minimum value of the preset step range. For example, if the target output step value is greater than the preset step range, it is taken as the maximum value of the preset step range.

[0050] In addition, in some embodiments, when the opening of the electronic expansion valve is less than the preset opening, the opening of the electronic expansion valve is adjusted according to the second preset step, and the interval between two adjacent adjustments is the third preset time length, that is, when the opening of the electronic expansion valve has not reached the preset opening, it is necessary to adjust it once every third preset time length, and the step of each adjustment is the second preset step.

[0051] Figure 2 As shown in the control flow chart provided for one embodiment of the present application, multiple conditions must be determined to determine whether to adjust the opening of the electronic expansion valve based on the exhaust superheat. For example, if the ambient temperature detected within 180 seconds (i.e., a first preset duration) is not less than a preset upper limit value d, the exhaust temperature is determined; if the exhaust temperature is less than 65°C (i.e., a preset temperature value), the compressor frequency is determined; and if the compressor frequency is within a preset frequency range H, the electronic expansion valve opening is determined to be adjusted based on the exhaust superheat.

[0052] The minimum value of the preset frequency range H is H06, and the maximum value is (H06+H08) / 2. H06 represents the set minimum heating frequency of the compressor, and H08 represents the set maximum heating frequency of the compressor.

[0053] When the exhaust gas superheat Ts is less than 12° C. (ie, the first preset temperature), PID regulation is applied to the electronic expansion valve. For example, the target output step is calculated using the following formula.

[0054] PID=KP*e(n)+KI*[e(1)+e(2)+……+e(n)]+KD*[e(n)-e(n-1)]

[0055] Wherein, PID represents the target output step of this PID adjustment, KP is the proportional parameter value, KI is the integral parameter value, KD is the differential parameter value, n represents the number of times PID adjustment is performed, and e(1), e(2)…e(n) are the exhaust difference values ​​in each PID adjustment, which is the difference between the exhaust superheat and the preset superheat.

[0056] Furthermore, when the exhaust gas superheat Ts is greater than or equal to 12°C and less than or equal to 22°C (i.e., the second preset temperature), the electronic expansion valve is not adjusted. When the exhaust gas superheat Ts is greater than 22°C, the opening of the electronic expansion valve is adjusted in 5 steps, with adjustments made every 90 seconds.

[0057] Figure 3 This is a schematic diagram of an electronic expansion valve control device provided in an embodiment of the present application. The device is used to execute the electronic expansion valve control method provided in the above embodiment, and has functional modules and beneficial effects corresponding to the execution method. As shown in the figure, the device includes: a parameter acquisition module 301, a parameter monitoring module 302, a parameter determination module 303 and an opening adjustment module 304.

[0058] The parameter acquisition module 301 is configured to acquire the ambient temperature, the exhaust temperature of the compressor, and the compressor frequency in real time;

[0059] The parameter monitoring module 302 is configured to determine to activate the auxiliary control function of the electronic expansion valve and monitor the exhaust temperature and the compressor frequency if the ambient temperature exceeds a preset upper limit within a first preset time period;

[0060] The parameter determination module 303 is configured to determine the exhaust gas superheat based on the ambient temperature and the exhaust gas temperature when the exhaust gas temperature is less than a preset temperature value and the compressor frequency is within a preset frequency range;

[0061] The opening adjustment module 304 is configured to execute a corresponding opening adjustment strategy for the electronic expansion valve according to the temperature range of the exhaust gas superheat.

[0062] On the basis of the above-mentioned embodiments, the parameter determination module 303 is further configured to:

[0063] According to the first mapping relationship between the compressor frequency and the frequency base, a target frequency base corresponding to the current compressor frequency is determined;

[0064] According to the second mapping relationship between the ambient temperature and the ambient temperature base, a target ambient temperature base corresponding to the current ambient temperature is determined;

[0065] Based on the product of the target frequency base, the target ambient temperature base and the preset compensation base, a compensation value is determined;

[0066] In combination with the compensation value, the outlet water temperature of the condenser is compensated to obtain a compensation temperature, and the difference between the exhaust temperature and the compensation temperature is taken as the exhaust superheat.

[0067] On the basis of the above-mentioned embodiments, the parameter determination module 303 is further configured to:

[0068] The frequency base and the compressor frequency located in the preset frequency range vary linearly; the ambient temperature base and the ambient temperature located in the preset ambient temperature range vary linearly.

[0069] On the basis of the above-mentioned embodiments, the opening degree adjustment module 304 is further configured to:

[0070] When the exhaust superheat is located in the first temperature interval, the electronic expansion valve is PID adjusted based on the exhaust superheat;

[0071] When the exhaust superheat is located in the second temperature interval, the opening degree of the electronic expansion valve is stopped from being adjusted;

[0072] When the exhaust superheat is located in the third temperature interval, the opening degree of the electronic expansion valve is adjusted according to a first preset step, and the interval between two adjacent adjustments is a second preset time length;

[0073] Wherein, the temperature value of the first temperature interval is less than a first preset temperature, the temperature value of the second temperature interval is greater than or equal to the first preset temperature and less than a second preset temperature, and the temperature value of the third temperature interval is greater than or equal to the second preset temperature.

[0074] On the basis of the above-mentioned embodiments, the opening degree adjustment module 304 is further configured to:

[0075] Based on preset proportional parameter values, integral parameter values and differential parameter values, the corresponding exhaust difference, temperature error cumulative value and temperature difference are calculated respectively to determine the corresponding target output step;

[0076] The historical output step corresponding to the last PID adjustment is determined, and the sum of the target output step and the historical output step is taken as the actual output step of this time PID adjustment.

[0077] Among them, the exhaust difference is the difference between the exhaust superheat and the preset superheat; the temperature error cumulative value is the cumulative sum of the exhaust difference corresponding to each PID adjustment; the temperature difference is the difference between the exhaust difference corresponding to this PID adjustment and the exhaust difference corresponding to the previous PID adjustment

[0078] On the basis of the above embodiment, the opening adjustment module 304 is further configured as follows: the target output step is within a preset step range.

[0079] Based on the above embodiment, the opening adjustment module 304 is further configured to: when the opening of the electronic expansion valve is less than the preset opening, adjust the opening of the electronic expansion valve according to the second preset step, and the interval between two adjacent adjustments is a third preset time length.

[0080] It is worth noting that in the embodiment of the above-mentioned electronic expansion valve control device, the various functional modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0081] Figure 4 A structural diagram of an electronic device provided in an embodiment of the present application, as shown in the figure, the device includes a processor 401, a memory 402, an input device 403 and an output device 404. The number of processors 401 in the device can be one or more, and the figure takes one processor 401 as an example; the processor 401, memory 402, input device 403 and output device 404 in the device can be connected via a bus or other means, and the figure takes the connection via a bus as an example. The memory 402, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the electronic expansion valve control method in the embodiment of the present application. The processor 401 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 402, that is, realizes the above-mentioned electronic expansion valve control method.

[0082] The memory 402 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; and the data storage area can store data created according to the use of the electronic device, such as exhaust difference, etc. In addition, the memory 402 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 402 can further include a memory disposed remotely with respect to the processor 401, which can be connected to the terminal device through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0083] The input device 403 can be used to receive input digital or character information, and to generate key signal input related to user settings and function control of the device. The output device 404 can be used to send or display key signal output related to user settings and function control of the device.

[0084] The embodiment of the present application further provides a storage medium storing computer executable instructions, which, when executed by a processor, are used for performing the related operations in the electronic expansion valve control method provided by any of the embodiments of the present application.

[0085] The computer readable storage medium includes permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology to store information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, disk storage or other magnetic storage device, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0086] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent in such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0087] Note that the above are only preferred embodiments of the present application and the technical principles employed. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present application. The scope of the present application is determined by the scope of the appended claims.

Claims

1. A method for controlling an electronic expansion valve, characterized in that: Applied to a heat pump system, the heat pump system includes a compressor, a condenser, an electronic expansion valve, and an evaporator. When the heat pump system is in a heating mode, the method includes: Acquiring the ambient temperature and the exhaust temperature and compressor frequency of the compressor in real time; If the ambient temperature exceeds a preset upper limit within a first preset time period, determining to start the auxiliary control function of the electronic expansion valve and monitor the exhaust temperature and the compressor frequency; When the exhaust gas temperature is less than a preset temperature value and the compressor frequency is within a preset frequency range, determining an exhaust gas superheat based on the compressor frequency, the ambient temperature, and the exhaust gas temperature; executing a corresponding opening adjustment strategy for the electronic expansion valve according to the temperature range of the exhaust gas superheat; Wherein, executing a corresponding opening adjustment strategy for the electronic expansion valve according to the temperature range of the exhaust gas superheat includes: When the exhaust gas superheat is within a first temperature range, performing PID adjustment on the electronic expansion valve based on the exhaust gas superheat; When the exhaust gas superheat is within the second temperature range, stopping adjusting the opening of the electronic expansion valve; When the exhaust gas superheat is within the third temperature range, the opening of the electronic expansion valve is adjusted according to a first preset step, and a second preset time interval is set between two adjacent adjustments; The temperature value of the first temperature interval is lower than the first preset temperature, the temperature value of the second temperature interval is greater than or equal to the first preset temperature and lower than the second preset temperature, and the temperature value of the third temperature interval is greater than or equal to the second preset temperature; Furthermore, when the exhaust gas superheat is within the first temperature range, performing PID adjustment on the electronic expansion valve based on the exhaust gas superheat includes: Based on the preset proportional parameter value, integral parameter value and differential parameter value, the corresponding exhaust difference value, temperature error cumulative value and temperature difference value are calculated respectively to determine the corresponding target output step; Determine the historical output step corresponding to the last PID adjustment, and use the sum of the target output step and the historical output step as the actual output step of this PID adjustment; The exhaust difference is the difference between the exhaust superheat and the preset superheat; the temperature error cumulative value is the cumulative sum of the exhaust difference corresponding to each PID adjustment; the temperature difference is the difference between the exhaust difference corresponding to this PID adjustment and the exhaust difference corresponding to the previous PID adjustment.

2. The electronic expansion valve control method according to claim 1, characterized in that: When the exhaust temperature is less than a preset temperature value and the compressor frequency is within a preset range, determining the exhaust superheat based on the compressor frequency, the ambient temperature, and the exhaust temperature includes: Determining a target frequency base corresponding to the current compressor frequency according to a first mapping relationship between the compressor frequency and the frequency base; Determining a target ambient temperature base corresponding to the current ambient temperature according to a second mapping relationship between the ambient temperature and the ambient temperature base; Determining a compensation value based on a product of the target frequency base, the target ambient temperature base, and a preset compensation base; In combination with the compensation value, the outlet water temperature of the condenser is compensated to obtain a compensation temperature, and the difference between the exhaust temperature and the compensation temperature is used as the exhaust superheat.

3. The electronic expansion valve control method according to claim 2, characterized in that: The frequency base varies linearly with the compressor frequency within the preset frequency range; and the ambient temperature base varies linearly with the ambient temperature within the preset ambient temperature interval.

4. The electronic expansion valve control method according to claim 1, characterized in that: The target output step is within a preset step range.

5. The electronic expansion valve control method according to claim 1, characterized in that: The method further comprises: When the opening of the electronic expansion valve is less than the preset opening, the opening of the electronic expansion valve is adjusted according to a second preset step, and the interval between two adjacent adjustments is a third preset time length.

6. An electronic expansion valve control device, characterized in that: Applied to a heat pump system, the heat pump system includes a compressor, a condenser, an electronic expansion valve and an evaporator, and the device includes: a parameter acquisition module configured to acquire the ambient temperature, the exhaust temperature of the compressor, and the compressor frequency in real time; a parameter monitoring module configured to, if the ambient temperature exceeds a preset upper limit within a first preset time period, determine to activate an auxiliary control function of the electronic expansion valve and monitor the exhaust temperature and the compressor frequency; a parameter determination module configured to determine an exhaust gas superheat based on the ambient temperature and the exhaust gas temperature when the exhaust gas temperature is less than a preset temperature value and the compressor frequency is within a preset frequency range; an opening adjustment module configured to execute a corresponding opening adjustment strategy for the electronic expansion valve according to the temperature range of the exhaust gas superheat; The opening adjustment module is specifically configured as follows: When the exhaust gas superheat is within a first temperature range, performing PID adjustment on the electronic expansion valve based on the exhaust gas superheat; When the exhaust gas superheat is within the second temperature range, stopping adjusting the opening of the electronic expansion valve; When the exhaust gas superheat is within the third temperature range, the opening of the electronic expansion valve is adjusted according to a first preset step, and a second preset time interval is set between two adjacent adjustments; The temperature value of the first temperature interval is lower than the first preset temperature, the temperature value of the second temperature interval is greater than or equal to the first preset temperature and lower than the second preset temperature, and the temperature value of the third temperature interval is greater than or equal to the second preset temperature; Furthermore, when the exhaust gas superheat is within the first temperature range, performing PID adjustment on the electronic expansion valve based on the exhaust gas superheat includes: Based on the preset proportional parameter value, integral parameter value and differential parameter value, the corresponding exhaust difference value, temperature error cumulative value and temperature difference value are calculated respectively to determine the corresponding target output step; Determine the historical output step corresponding to the last PID adjustment, and use the sum of the target output step and the historical output step as the actual output step of this PID adjustment; The exhaust difference is the difference between the exhaust superheat and the preset superheat; the temperature error cumulative value is the cumulative sum of the exhaust difference corresponding to each PID adjustment; the temperature difference is the difference between the exhaust difference corresponding to this PID adjustment and the exhaust difference corresponding to the previous PID adjustment.

7. An electronic device, comprising: one or more processors; A storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, enables the one or more processors to implement the electronic expansion valve control method according to any one of claims 1 to 5.

8. A storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the electronic expansion valve control method according to any one of claims 1 to 5 when executed by a processor.

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