Control method for electronic expansion valve, heat pump system, and storage medium

Abstract

Provided are a control method for an electronic expansion valve (300), a heat pump system, and a storage medium. The method comprises: upon receipt of a shutdown instruction of a heat pump system, measuring a pressure value related to operation of an electronic expansion valve (300) in the heat pump system; and controlling the opening degree of the electronic expansion valve (300) on the basis of the pressure value, so that the heat pump system reaches a pressure balance state.

Description

Electronic expansion valve control method, heat pump system and storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 24, 2023, with application number 202311077513.8 and invention name “Control method of electronic expansion valve, heat pump system and storage medium”, the entire contents of which are incorporated by reference in this application. Technical Field

[0002] The present application relates to the field of heat pump technology, and in particular to a control method for an electronic expansion valve, a heat pump system, and a storage medium. Background Art

[0003] Heat pump systems (such as heat pump systems) generally use electronic expansion valves to throttle and reduce pressure to achieve a normal heat exchange cycle.

[0004] Currently, when a heat pump system is shut down, the electronic expansion valve is directly controlled to increase its opening to unload and achieve pressure balance. However, a sudden pressure change occurs when the system is shut down. The current control method of the electronic expansion valve is prone to cause wear of structures such as the valve needle in the electronic expansion valve, thereby reducing the service life of the electronic expansion valve. Technical issues

[0005] The main purpose of this application is to provide a control method for an electronic expansion valve, a heat pump system and a storage medium, aiming to reduce the wear of the electronic expansion valve after the heat pump system is shut down and to increase the service life of the electronic expansion valve. Technical Solutions

[0006] To achieve the above objectives, the present application provides a method for controlling an electronic expansion valve, the method comprising the following steps:

[0007] When a shutdown instruction of the heat pump system is received, detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system;

[0008] The opening of the electronic expansion valve is controlled according to the pressure value so that the heat pump system reaches a pressure balance state.

[0009] In one embodiment, the step of controlling the opening of the electronic expansion valve according to the pressure value so that the heat pump system reaches a pressure equilibrium state includes:

[0010] When the pressure value is not greater than a preset pressure threshold, controlling the electronic expansion valve to increase its opening;

[0011] When the pressure value is greater than the preset pressure threshold, the electronic expansion valve is controlled to maintain a current opening.

[0012] In one embodiment, the step of controlling the electronic expansion valve to increase its opening degree includes:

[0013] Controlling the electronic expansion valve to increase to a first preset opening, wherein the preset opening is greater than the current opening of the electronic expansion valve; or

[0014] The electronic expansion valve is controlled to increase its opening according to the pressure value.

[0015] In one embodiment, the step of controlling the electronic expansion valve to increase its opening according to the pressure value includes:

[0016] determining a pressure difference between the preset pressure threshold and the pressure value;

[0017] determining an opening adjustment value according to the pressure difference;

[0018] The electronic expansion valve is controlled to increase its opening by the opening adjustment value.

[0019] In one embodiment, when a shutdown instruction of the heat pump system is received, the step of detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system includes:

[0020] When a shutdown instruction of the heat pump system is received, the pressure values ​​at both ends of the electronic expansion valve are detected respectively to obtain a first pressure value and a second pressure value.

[0021] In one embodiment, the step of controlling the opening of the electronic expansion valve according to the pressure value so that the heat pump system reaches a pressure equilibrium state includes:

[0022] determining a maximum pressure value between the first pressure value and the second pressure value;

[0023] The opening of the electronic expansion valve is controlled according to the maximum pressure value so that the heat pump system reaches a pressure balance state.

[0024] In one embodiment, when a shutdown instruction of the heat pump system is received, the step of detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system includes:

[0025] When a shutdown instruction of the heat pump system is received, obtaining the shutdown duration of the heat pump system;

[0026] When the shutdown time reaches a first preset time, a pressure value related to the operation of the electronic expansion valve in the heat pump system is detected.

[0027] In one embodiment, after the step of controlling the opening of the electronic expansion valve according to the pressure value so that the heat pump system reaches a pressure equilibrium state, the method for controlling the electronic expansion valve further includes:

[0028] Obtaining the downtime of the heat pump system;

[0029] When the shutdown duration reaches a second preset duration, the electronic expansion valve is controlled to reset to a second preset opening.

[0030] In addition, in order to achieve the above objectives, the present application also proposes a heat pump system, which includes:

[0031] Electronic expansion valve;

[0032] a pressure detection module, the pressure detection module being provided at at least one end of the electronic expansion valve;

[0033] A control device, the electronic expansion valve and the pressure detection module are both connected to the control device, the control device comprising: a memory, a processor, and a control program for the electronic expansion valve stored in the memory and executable on the processor, wherein the control program for the electronic expansion valve, when executed by the processor, implements the steps of the control method for the electronic expansion valve as described in any one of the above items.

[0034] In one embodiment, the pressure detection module includes a first pressure sensor and a second pressure sensor respectively provided at two ends of the electronic expansion valve, and the first pressure sensor and the second pressure sensor are both connected to the control device.

[0035] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of an electronic expansion valve is stored. When the control program of the electronic expansion valve is executed by a processor, the steps of the control method of the electronic expansion valve as described in any of the above items are implemented. Beneficial effects

[0036] The present application proposes a control method for an electronic expansion valve. When receiving a shutdown command of a heat pump system, the method detects a pressure value related to the operation of the electronic expansion valve in the heat pump system, and regulates the opening of the electronic expansion valve according to the pressure value to make the system pressure reach a balanced state, thereby ensuring that the opening adjustment of the electronic expansion valve can match the actual pressure state of the system, thereby effectively reducing the wear of the electronic expansion valve after the heat pump system is shut down and improving the service life of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic structural diagram of a refrigerant system according to an embodiment of a heat pump system of the present application;

[0038] FIG2 is a schematic diagram of the hardware structure involved in the operation of an embodiment of the heat pump system of the present application;

[0039] FIG3 is a flow chart of an embodiment of a method for controlling an electronic expansion valve of the present application;

[0040] FIG4 is a flow chart of another embodiment of a method for controlling an electronic expansion valve according to the present invention;

[0041] FIG5 is a flow chart of another embodiment of a method for controlling an electronic expansion valve according to the present application.

[0042] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0043] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0044] The present application provides a heat pump system. In one embodiment, the heat pump system is an air conditioner. In other embodiments, the heat pump system may be other types of equipment, such as a heat pump water heater, a refrigerator, etc.

[0045] In the embodiment of the present application, referring to FIG. 1 and FIG. 2 , the heat pump system includes a control device 100 , a compressor 200 , a first heat exchanger 400 , an electronic expansion valve 300 , and a second heat exchanger 500 .

[0046] The first heat exchanger 400 , the electronic expansion valve 300 and the second heat exchanger 500 are connected in sequence. The first heat exchanger 400 and the second heat exchanger 500 are communicated with the exhaust port of the compressor 200 and the return port of the compressor 200 , respectively.

[0047] In one implementation, the first heat exchanger 400 is connected to the exhaust port, and the second heat exchanger 500 is connected to the return port. When the compressor 200 is turned on, the refrigerant flows through the first heat exchanger 400, the electronic expansion valve 300, and the second heat exchanger 500 in sequence before returning to the compressor 200.

[0048] In another embodiment, the first heat exchanger 400 is connected to the return air port, and the second heat exchanger 500 is connected to the exhaust port. When the compressor 200 is turned on, the refrigerant flows through the second heat exchanger 500, the electronic expansion valve 300, and the first heat exchanger 400 in sequence before returning to the compressor 200.

[0049] In another embodiment, the heat pump system may further include a reversing assembly 600 (e.g., a four-way valve). The first heat exchanger 400, the second heat exchanger 500, the exhaust port of the compressor 200, and the return port of the compressor 200 are all connected to the reversing assembly 600. The reversing assembly 600 has a first operating state and a second operating state. When the reversing assembly 600 operates in the first operating state, the first heat exchanger 400 is connected to the exhaust port, and the second heat exchanger 500 is connected to the return port. When the compressor 200 is turned on, the refrigerant flows through the first heat exchanger 400, the electronic expansion valve 300, and the second heat exchanger 500 in sequence before returning to the compressor 200. When the reversing assembly 600 operates in the second operating state, the first heat exchanger 400 is connected to the return port, and the second heat exchanger 500 is connected to the exhaust port. When the compressor 200 is turned on, the refrigerant flows through the second heat exchanger 500, the electronic expansion valve 300, and the first heat exchanger 400 in sequence before returning to the compressor 200.

[0050] Furthermore, in one embodiment, referring to Figures 1 and 2 , the heat pump system may further include a pressure detection module 700 , which is connected to the control device 100 and is configured to detect pressure values ​​associated with the operation of the electronic expansion valve 300 in the heat pump system. The pressure detection module 700 may include one or more pressure sensors. In one embodiment, the pressure detection module 700 is disposed at at least one end of the electronic expansion valve 300 .

[0051] The pressure detection module 700 includes a first pressure sensor 701 and a second pressure sensor 702, respectively provided at both ends of the electronic expansion valve 300. The first pressure sensor 701 and the second pressure sensor 702 are both connected to the control device 100. The first pressure sensor 701 is used to detect the refrigerant pressure at one end of the electronic expansion valve 300, and the second pressure sensor 702 is used to detect the refrigerant pressure at the other end of the electronic expansion valve 300.

[0052] In other embodiments, the pressure detection module 700 may also be disposed on at least one side of the compressor 200 or on the first heat exchanger 400 and / or the second heat exchanger 500 .

[0053] In the embodiment of the present application, referring to FIG2 , the control device 100 includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. Memory 1002 can be high-speed RAM or non-volatile memory, such as a disk drive. Memory 1002 can also be a storage device independent of the processor 1001.

[0054] Those skilled in the art will understand that the device structure shown in FIG2 does not constitute a limitation on the device, and may include more or fewer components than shown, or a combination of certain components, or a different arrangement of components.

[0055] As shown in FIG. 2 , the memory 1002 as a computer storage medium may include a control program for the electronic expansion valve 300 .

[0056] In the device shown in FIG. 2 , the processor 1001 may be configured to call the control program of the electronic expansion valve 300 stored in the memory 1002 and execute the relevant steps of the control method of the electronic expansion valve 300 in the following embodiments.

[0057] An embodiment of the present application also provides a control method for an electronic expansion valve, which is applied to the above-mentioned heat pump system.

[0058] 3 , an embodiment of a control method for an electronic expansion valve of the present application is provided. In one embodiment, the control method for the electronic expansion valve includes:

[0059] Step S10, when a shutdown instruction of the heat pump system is received, detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system;

[0060] The shutdown command can be input by the user or generated when the heat pump system reaches the shutdown condition. When the shutdown command of the heat pump system is received, the compressor is controlled to shut down and the pressure value is detected.

[0061] The pressure value can be obtained by obtaining the pressure data currently detected by the above-mentioned pressure detection module, or by obtaining the pressure data detected by the pressure detection module within a period of time after shutdown, or by obtaining the first pressure data detected by the pressure detection module before shutdown and the second pressure data detected after shutdown.

[0062] Step S20: controlling the opening of the electronic expansion valve according to the pressure value so that the heat pump system reaches a pressure balance state.

[0063] The opening control parameters of the electronic expansion valve are determined according to the pressure value. Different pressure values ​​correspond to different opening control parameters of the electronic expansion valve, and the operation of the electronic expansion valve is controlled according to the opening control parameters.

[0064] The opening control parameters determined are those that can unload the heat pump system while maintaining an impact force on the internal components of the electronic expansion valve below a preset pressure. These opening control parameters include, but are not limited to, at least one of the following: target opening, opening adjustment rate, opening adjustment amplitude, opening adjustment ratio, and opening adjustment direction (increasing, decreasing, or maintaining the current opening).

[0065] In one implementation, an opening control parameter may be determined according to the pressure range in which the pressure value is located, and the operation of the electronic expansion valve may be controlled according to the opening control parameter.

[0066] In another implementation, an opening control parameter may be determined based on a magnitude relationship or a quantitative relationship value between the pressure value and a preset pressure value, and the operation of the electronic expansion valve may be controlled according to the opening control parameter.

[0067] An embodiment of the present application proposes a control method for an electronic expansion valve. When receiving a shutdown command of a heat pump system, the method detects a pressure value related to the operation of the electronic expansion valve in the heat pump system, and regulates the opening of the electronic expansion valve according to the pressure value to make the system pressure reach a balanced state, thereby ensuring that the opening adjustment of the electronic expansion valve can match the actual pressure state of the system, thereby effectively reducing the wear of the electronic expansion valve after the heat pump system is shut down and improving the service life of the electronic expansion valve.

[0068] Furthermore, based on the above embodiment, another embodiment of the control method of the electronic expansion valve of the present application is proposed. In one embodiment, referring to FIG4 , the step S20 includes:

[0069] Step S21, when the pressure value is not greater than a preset pressure threshold, controlling the electronic expansion valve to increase its opening;

[0070] The preset pressure threshold is the maximum pressure allowed to protect the internal structure of the electronic expansion valve from wear when the opening of the electronic expansion valve increases during the shutdown process of the heat pump system.

[0071] When the electronic expansion valve increases its opening, the opening adjustment value can be increased by a preset fixed opening adjustment value, or by a target opening adjustment value determined according to the actual operation of the heat pump system, or directly increased to a preset fixed opening.

[0072] In one implementation of this embodiment, the electronic expansion valve is controlled to increase to a first preset opening, which is greater than the current opening of the electronic expansion valve. In one embodiment, the first preset opening is the maximum opening of the electronic expansion valve. This helps protect the electronic expansion valve and increases the speed at which the system reaches pressure equilibrium after shutdown. In other embodiments, the first preset opening may also be a smaller opening than the maximum opening of the electronic expansion valve.

[0073] In another implementation of this embodiment, the electronic expansion valve is controlled to increase its opening based on the pressure value. An opening adjustment value can be determined based on the pressure range in which the pressure value falls, and the electronic expansion valve can be controlled to increase its opening by the opening adjustment value. Alternatively, a target opening of the electronic expansion valve can be determined based on the pressure value, and the electronic expansion valve can be controlled to increase its opening to the target opening.

[0074] Step S22: When the pressure value is greater than the preset pressure threshold, controlling the electronic expansion valve to maintain the current opening.

[0075] When the electronic expansion valve reduces its opening, the opening adjustment value can be reduced to a preset fixed opening adjustment value, or a target opening adjustment value determined according to the actual operation of the heat pump system, or can be directly reduced to a preset fixed opening.

[0076] In one embodiment, when the pressure value is no greater than a preset pressure threshold, it indicates that increasing the opening of the electronic expansion valve can relieve pressure while protecting the internal structure from wear. In this case, the electronic expansion valve is controlled to increase its opening, enabling rapid system unloading and achieving a pressure equilibrium state. When the pressure value is greater than the preset pressure threshold, it indicates that increasing the opening of the electronic expansion valve would cause excessive impact on the internal structure, causing wear. In this case, the electronic expansion valve is controlled to maintain its current opening to unload the system, effectively reducing wear on the electronic expansion valve caused by unloading during shutdown. This effectively extends the service life of the electronic expansion valve.

[0077] In other embodiments, when the pressure value is greater than a preset pressure threshold, the electronic expansion valve may be controlled to reduce the current opening.

[0078] Furthermore, in one embodiment, the step of controlling the electronic expansion valve to increase its opening according to the pressure value includes: determining a pressure difference between the preset pressure threshold and the pressure value; determining an opening adjustment value according to the pressure difference; and controlling the electronic expansion valve to increase its opening with the opening adjustment value.

[0079] Different pressure differentials correspond to different opening adjustment values. The opening adjustment value may include an opening adjustment amplitude, an opening adjustment ratio, or an opening adjustment rate. The pressure differential is positively correlated with the opening adjustment value.

[0080] The correspondence between the pressure difference and the opening adjustment value can be pre-set and can be in the form of a calculation formula, a mapping relationship, an algorithm model, etc. For example, if the correspondence is a calculation formula, the pressure difference can be substituted into the calculation formula to calculate the opening adjustment value. For another example, if the correspondence is a mapping table, the result obtained by looking up the pressure difference in the table can be used as the opening adjustment value.

[0081] In one embodiment, the opening adjustment value determined by the pressure difference between the preset pressure threshold and the pressure value is adapted to control the electronic expansion valve to increase the opening, which is beneficial to ensure that the electronic expansion valve can achieve rapid pressure balance during the increase process while further reducing wear on its internal structure.

[0082] Furthermore, the correspondence between the pressure difference and the opening adjustment value can be fixed to one. Alternatively, more than one correspondence between the pressure difference and the opening adjustment value can be pre-set, and a target correspondence is determined from the more than one correspondence according to the actual operation of the heat pump system, and the opening adjustment value corresponding to the pressure difference is determined based on the target correspondence. For example, the change value of the pressure difference across the electronic expansion valve before and after the heat pump system is shut down and the temperature difference between the heat exchanger temperature and the ambient temperature when the heat pump system is shut down can be obtained, and the target correspondence is determined based on the change value and the temperature difference. Different change values ​​and different temperature difference values ​​correspond to different target correspondences. Among them, the change value and the temperature difference can accurately reflect the impact of the overall pressure change trend of the system on the risk of wear of the internal structure of the electronic expansion valve during the process of increasing the opening of the electronic expansion valve. Therefore, combining the change value and the temperature difference to determine the target correspondence is conducive to quickly unloading to achieve a pressure equilibrium state while further reducing the wear risk of the electronic expansion valve.

[0083] Furthermore, based on any of the above embodiments, another embodiment of the control method of the electronic expansion valve of the present application is proposed. In one embodiment, referring to FIG5 , step S10 includes:

[0084] Step S11 : When a shutdown instruction of the heat pump system is received, the pressure values ​​at both ends of the electronic expansion valve are detected respectively to obtain a first pressure value and a second pressure value.

[0085] The first pressure value is detected by the first pressure sensor, and the second pressure value is detected by the second pressure sensor.

[0086] When a shutdown instruction of the heat pump system is received, the compressor is controlled to shut down, and the first pressure value and the second pressure value are detected when the compressor is in the shutdown state.

[0087] In one embodiment, the pressure values ​​at both ends of the electronic expansion valve can accurately reflect the impact on the internal structure of the electronic expansion valve after the opening degree of the electronic expansion valve is increased. Therefore, after the heat pump system is shut down, the opening degree of the electronic expansion valve is adjusted according to the pressure values ​​at both ends of the electronic expansion valve, which is conducive to rapid pressure balance and further reduces the wear of the electronic expansion valve.

[0088] Furthermore, in one embodiment, referring to FIG. 5 , step S20 includes:

[0089] Step S201, determining the maximum pressure value between the first pressure value and the second pressure value;

[0090] When the first pressure value is greater than the second pressure value, the first pressure value is the maximum pressure value.

[0091] When the first pressure value is less than the second pressure value, the second pressure value is the maximum pressure value.

[0092] Step S202 : controlling the opening of the electronic expansion valve according to the maximum pressure value so that the heat pump system reaches a pressure equilibrium state.

[0093] When the maximum pressure is not greater than a preset pressure threshold, the electronic expansion valve is controlled to increase its opening; when the maximum pressure is greater than the preset pressure threshold, the electronic expansion valve is controlled to maintain its current opening.

[0094] In one embodiment, the pressure at the high-pressure end of the electronic expansion valve can accurately reflect the maximum risk of wear to its internal structure. Therefore, the opening of the electronic expansion valve is controlled according to the maximum pressure between the two ends of the electronic expansion valve. This is conducive to ensuring that no matter how the refrigerant flow direction of the system changes before shutdown, the opening of the electronic expansion valve can be accurately adjusted to adapt to the wear risk after shutdown, thereby achieving system pressure balance while reducing the wear risk of the electronic expansion valve.

[0095] In other embodiments, the average of the first pressure value and the second pressure value may be determined as the average pressure, and the opening of the electronic expansion valve may be controlled according to the average pressure.

[0096] Furthermore, based on any of the above embodiments, another embodiment of the electronic expansion valve control method of the present application is provided. In one embodiment, step S10 includes: upon receiving a shutdown command of the heat pump system, obtaining a shutdown duration of the heat pump system; and when the shutdown duration reaches a first preset duration, detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system.

[0097] The first preset duration may be a preset fixed duration, for example, 30 seconds. The first preset duration may also be determined based on the conditions before the heat pump system is shut down, for example, based on the operating frequency of the compressor before the heat pump system is shut down.

[0098] When the shutdown duration does not reach the first preset duration, the electronic expansion valve is controlled to maintain the current opening.

[0099] In one embodiment, the pressure value is detected again after the heat pump system has been shut down for a period of time, and the opening of the electronic expansion valve is regulated according to the pressure value, which is beneficial to improving the accuracy of the pressure value in characterizing the wear risk of the electronic expansion valve, thereby further reducing the loss of the electronic expansion valve and achieving a pressure balance state of the system.

[0100] Furthermore, based on any of the above embodiments, another embodiment of the electronic expansion valve control method of the present application is provided. In one embodiment, after step S20, the method further includes: obtaining the downtime of the heat pump system; and when the downtime reaches a second preset time, controlling the electronic expansion valve to reset to a second preset opening.

[0101] The second preset time length is greater than the first preset time length.

[0102] The second preset duration can be a preset fixed duration, for example, the first preset duration can be 120 seconds. The second preset duration can also be determined based on the actual conditions of the heat pump system, for example, based on the pressure value and the pressure change value after the electronic expansion valve opening is increased.

[0103] The second preset time duration represents that the heat pump system reaches a pressure equilibrium state after being shut down.

[0104] The second preset opening is a pre-set fixed opening. The second preset opening is between 30% and 70% of the maximum opening. In one embodiment, when the heat pump system is down for 30 seconds, the pressure value is detected. When the detected pressure value is not greater than the preset pressure threshold, the electronic expansion valve is controlled to increase to a maximum opening of 480 pls. When the detected pressure value is greater than the preset pressure threshold, the electronic expansion valve is controlled to maintain the current opening. After the electronic expansion valve increases its opening or maintains its current opening, if the downtime reaches 120 seconds, the electronic expansion valve is controlled to reset to 220 pls.

[0105] In one embodiment, the electronic expansion valve is reset to a second preset opening when the shutdown time reaches a second preset time. This is beneficial for avoiding the impact of sudden pressure changes on the internal structure of the electronic expansion valve when the heat pump system is restarted, further reducing the wear of the electronic expansion valve, and increasing the service life of the electronic expansion valve.

[0106] In one embodiment, the first preset opening is greater than the second preset opening.

[0107] In addition, an embodiment of the present application further provides a storage medium on which a control program for an electronic expansion valve is stored. When the control program for the electronic expansion valve is executed by a processor, the relevant steps of any embodiment of the above-mentioned method for controlling an electronic expansion valve are implemented.

[0108] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0109] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0110] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, heat pump system, or network equipment, etc.) to execute the methods described in each embodiment of the present application.

[0111] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling an electronic expansion valve, wherein: The control method of the electronic expansion valve comprises the following steps: When a shutdown command of the heat pump system is received, detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system; The opening of the electronic expansion valve is controlled according to the pressure value so that the heat pump system reaches a pressure balance state.

2. The control method of the electronic expansion valve according to claim 1, wherein: The step of controlling the opening of the electronic expansion valve according to the pressure value so that the heat pump system reaches a pressure balance state comprises: When the pressure value is not greater than a preset pressure threshold, controlling the electronic expansion valve to increase its opening; When the pressure value is greater than the preset pressure threshold, the electronic expansion valve is controlled to maintain a current opening.

3. The control method of the electronic expansion valve according to claim 2, wherein: The step of controlling the electronic expansion valve to increase its opening degree comprises: Controlling the electronic expansion valve to increase to a first preset opening, wherein the preset opening is greater than the current opening of the electronic expansion valve; or, The electronic expansion valve is controlled to increase its opening according to the pressure value.

4. The control method of the electronic expansion valve according to claim 3, wherein: The step of controlling the electronic expansion valve to increase its opening according to the pressure value comprises: determining a pressure difference between the preset pressure threshold and the pressure value; Determining an opening adjustment value according to the pressure difference; The electronic expansion valve is controlled to increase its opening degree by the opening degree adjustment value.

5. The control method of the electronic expansion valve according to claim 1, wherein: When a shutdown instruction of the heat pump system is received, the step of detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system comprises: When a shutdown command of the heat pump system is received, the pressure values ​​at both ends of the electronic expansion valve are detected respectively to obtain a first pressure value and a second pressure value.

6. The control method of the electronic expansion valve according to claim 5, wherein: The step of controlling the opening of the electronic expansion valve according to the pressure value so that the heat pump system reaches a pressure balance state comprises: determining a maximum pressure value between the first pressure value and the second pressure value; The opening degree of the electronic expansion valve is controlled according to the maximum pressure value so that the heat pump system reaches a pressure balance state.

7. The control method of an electronic expansion valve according to any one of claims 1 to 6, wherein: When a shutdown instruction of the heat pump system is received, the step of detecting a pressure value related to the operation of the electronic expansion valve in the heat pump system comprises: When receiving a shutdown instruction of the heat pump system, obtaining the shutdown duration of the heat pump system; When the shutdown time reaches a first preset time, a pressure value related to the operation of the electronic expansion valve in the heat pump system is detected.

8. The control method of an electronic expansion valve according to any one of claims 1 to 6, wherein: After the step of controlling the opening of the electronic expansion valve according to the pressure value so that the heat pump system reaches a pressure balance state, the method for controlling the electronic expansion valve further includes: Obtaining the downtime duration of the heat pump system; When the shutdown time reaches a second preset time, the electronic expansion valve is controlled to reset to a second preset opening.

9. A heat pump system, wherein: The heat pump system comprises: Electronic expansion valve; A pressure detection module, wherein the pressure detection module is disposed at at least one end of the electronic expansion valve; A control device, wherein the electronic expansion valve and the pressure detection module are both connected to the control device, and the control device comprises: a memory, a processor, and a control program for the electronic expansion valve stored in the memory and executable on the processor, wherein the control program for the electronic expansion valve, when executed by the processor, implements the steps of the control method for the electronic expansion valve as described in any one of claims 1 to 8.

10. The heat pump system according to claim 9, wherein: The pressure detection module includes a first pressure sensor and a second pressure sensor respectively arranged at two ends of the electronic expansion valve, and the first pressure sensor and the second pressure sensor are both connected to the control device.

11. A storage medium, wherein: The storage medium stores a control program for an electronic expansion valve, and when the control program for the electronic expansion valve is executed by the processor, the steps of the control method for an electronic expansion valve according to any one of claims 1 to 8 are implemented.

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