Electronic expansion valve control strategy and electronic expansion valve control method under unsteady heating condition

Abstract

The invention relates to the technical field of heat management, and provides an unsteady heating condition electronic expansion valve control strategy which comprises the following steps: opening an electronic expansion valve to a first initial opening degree; the real-time supercooling degree of the air conditioning system is obtained; and PID operation is carried out according to the real-time supercooling degree and the target supercooling degree, so that a first adjusting variable of the opening degree of the electronic expansion valve is obtained, and the opening degree of the electronic expansion valve is adjusted according to the first adjusting variable. According to the method, when the air conditioning system is in the unsteady-state heating working condition, the supercooling degree is consistent with the low-temperature heating capacity and the flow attenuation trend, so that the attenuation condition of the circulating flow of the system under the unsteady-state heating working condition can be evaluated according to the supercooling degree, the opening degree of the electronic expansion valve is adjusted, and then the average heating capacity of the air conditioning system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of thermal management technology, and in particular to an electronic expansion valve control strategy and an electronic expansion valve control method under non-steady-state heating conditions. Background Art

[0002] In air conditioning systems, there are usually steady-state heating conditions and non-steady-state heating conditions. The steady-state heating condition is the condition where the heating capacity of the air conditioning system is stable; the non-steady-state heating condition is the condition where the heating capacity of the air conditioning system gradually decreases. For example, when the air conditioning system is operating in a low-temperature and high-humidity environment, the evaporator will be frosted, which will cause the heating capacity of the air conditioning system to decrease, and then the operating condition will change to a non-steady-state heating condition.

[0003] At present, electronic expansion valves are usually used as throttling devices in air-conditioning systems. The control of the opening of the electronic expansion valve is directly related to the heating capacity of the air-conditioning system. In the APF (annual energy consumption rate) performance matching process, the control strategy of EEV (electronic expansion valve) is to control through the target exhaust temperature. However, in non-steady-state heating conditions, the change of the target exhaust temperature is inconsistent with the attenuation trend of the heating capacity of the air-conditioning system, resulting in certain defects in the above control strategy in the non-steady-state heating conditions during the APF performance matching process. It cannot reflect the attenuation of the heating capacity of the air-conditioning system in non-steady-state heating conditions. Using this as a reference to adjust the opening of the electronic expansion valve cannot guarantee the average heating capacity of the air-conditioning system.

[0004] Therefore, based on the above technical problems, an electronic expansion valve control strategy for non-steady-state heating conditions is needed. By improving the electronic expansion valve control strategy for non-steady-state heating conditions, the attenuation of the heating capacity of the air-conditioning system in non-steady-state heating conditions can be better reflected. Summary of the invention

[0005] The purpose of the present invention is to provide an electronic expansion valve control strategy and an electronic expansion valve control method under non-steady-state heating conditions. Under non-steady-state heating conditions, the air-conditioning system adopts a target subcooling control strategy to better reflect the attenuation of the heating capacity of the air-conditioning system under non-steady-state heating conditions, thereby improving the average heating capacity of the air-conditioning system.

[0006] The non-steady-state heating condition electronic expansion valve control strategy of the present invention comprises the following steps:

[0007] Opening the electronic expansion valve to a first initial opening degree;

[0008] Get the real-time subcooling degree of the air conditioning system;

[0009] A PID operation is performed according to the real-time subcooling degree and the target subcooling degree to obtain a first regulating variable of the opening degree of the electronic expansion valve, and the opening degree of the electronic expansion valve is adjusted according to the first regulating variable.

[0010] Optionally, the real-time subcooling degree is the difference between the condenser outlet temperature and the middle temperature of the condenser coil or the difference between the exhaust temperature of the air-conditioning system and the condenser outlet temperature.

[0011] Optionally, performing PID operation according to the real-time subcooling degree and the target subcooling degree to obtain a first regulating variable of the opening degree of the electronic expansion valve includes:

[0012] A PID operation is performed according to the real-time subcooling degree and the target subcooling degree, and a first change rate table of the electronic expansion valve opening degree is obtained. A first adjustment variable of the electronic expansion valve opening degree is calculated based on the first change rate table.

[0013] Optionally, the non-steady-state heating condition of the air-conditioning system includes an initial stage and an operating stage;

[0014] In the initial stage, the electronic expansion valve is opened to the first initial opening degree;

[0015] During the operation phase, the real-time supercooling degree of the air-conditioning system is obtained and the opening degree of the electronic expansion valve is adjusted.

[0016] Optionally, opening the electronic expansion valve to a first initial opening degree comprises:

[0017] Turn on the air conditioning system's compressor;

[0018] Opening the electronic expansion valve in the air conditioning system to a first initial opening degree;

[0019] The electronic expansion valve is maintained in an open state for a first preset time.

[0020] The present invention also provides an electronic expansion valve control method, wherein the air conditioning system includes a steady-state heating condition and a non-steady-state heating condition;

[0021] When the air conditioning system is in the non-steady-state heating condition, the opening of the electronic expansion valve is controlled by the non-steady-state heating condition electronic expansion valve control strategy described above;

[0022] When the air conditioning system is in the steady-state heating condition during the APF matching process, the opening of the electronic expansion valve is controlled by the following steps:

[0023] opening the electronic expansion valve to a second initial opening degree;

[0024] Get the real-time exhaust temperature of the air conditioning system;

[0025] A PID operation is performed according to the real-time exhaust temperature and the target exhaust temperature to obtain a second regulating variable of the opening of the electronic expansion valve, and the opening of the electronic expansion valve is adjusted according to the second regulating variable.

[0026] Optionally, performing PID operation according to the real-time exhaust temperature and the target exhaust temperature to obtain a second regulating variable of the opening of the electronic expansion valve includes:

[0027] A PID operation is performed according to the real-time exhaust temperature and the target exhaust temperature to obtain a second change rate table of the electronic expansion valve opening, and a second adjustment variable of the electronic expansion valve opening is calculated based on the second change rate table.

[0028] Optionally, the air conditioning system includes an initial stage and an operating stage in a steady-state heating condition;

[0029] In the initial stage, the electronic expansion valve is opened to the second initial opening degree;

[0030] During the operation phase, the exhaust temperature of the air conditioning system is obtained and the opening of the electronic expansion valve is adjusted.

[0031] Optionally, opening the electronic expansion valve to a second initial opening degree comprises:

[0032] Turn on the air conditioning system's compressor;

[0033] opening the electronic expansion valve in the air conditioning system to a second initial opening degree;

[0034] The electronic expansion valve is maintained in the open state for a second preset time.

[0035] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed, the electronic expansion valve control method as described above is implemented.

[0036] In summary, the air conditioning system in the present invention uses the supercooling control method to adjust the opening of the electronic expansion valve in the non-steady-state heating condition. Overall, during the APF matching process, the control method of the air conditioning system EEV adopts a control method that combines the target superheat control in the steady-state heating condition with the supercooling control in the non-steady-state heating condition:

[0037] When the air-conditioning system is in steady-state heating conditions, the above-mentioned target exhaust temperature control strategy effectively improves the problem of excessively high exhaust temperature of the air-conditioning system. At the same time, under steady-state heating conditions, the system circulation flow remains unchanged. Properly increasing the target exhaust temperature can increase the exhaust enthalpy value (heating amount per unit mass), which can effectively improve the heating capacity.

[0038] When the air-conditioning system is in non-steady-state heating conditions, the subcooling degree is consistent with the low-temperature heating capacity and flow attenuation trend. Therefore, the attenuation of the system circulation flow under non-steady-state heating conditions can be evaluated based on the subcooling degree, so as to adjust the opening of the electronic expansion valve and ensure the average heating capacity of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is the electronic expansion valve control flow chart for the air conditioning system in steady-state heating conditions;

[0040] Figure 2 This is the electronic expansion valve control flow chart for the air conditioning system in non-steady-state heating conditions;

[0041] Figure 3a This is a comparison chart of the heating capacity of the air-conditioning system under non-steady-state heating conditions with different EEV openings;

[0042] Figure 3b This is a comparison chart of heating flow rates of air conditioning systems with different EEV openings under non-steady-state heating conditions;

[0043] Figure 3c This is a comparison chart of supercooling under different EEV opening conditions of the air-conditioning system under non-steady-state heating conditions. DETAILED DESCRIPTION

[0044] The following is a further detailed description of the electronic expansion valve control strategy for non-steady-state heating conditions proposed by the present invention in combination with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0045] As used in the present invention, the singular forms "one", "an" and "the" include plural objects, the term "or" is usually used to include the meaning of "and / or", the term "several" is usually used to include the meaning of "at least one", and the terms "at least two" or "multiple" are usually used to include the meaning of "two or more". In addition, the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" and "third" can explicitly or implicitly include one or at least two of the features. In addition, as used in the present invention, "installed", "connected", "connected", and one element "set" on another element should be understood in a broad sense, usually only indicating that there is a connection, coupling, matching or transmission relationship between the two elements, and the connection, coupling, matching or transmission between the two elements can be direct or indirect through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any orientation such as inside, outside, above, below or on one side of another element, unless the content clearly indicates otherwise. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used with respect to the exemplary embodiments as they are shown in the figures, with the upward or upper direction toward the top of the corresponding figure, and the downward or lower direction toward the bottom of the corresponding figure.

[0046] In air conditioning systems, there are usually steady-state heating conditions and unsteady-state heating conditions. The steady-state heating condition is the condition where the heating capacity of the air conditioning system is stable; the unsteady-state heating condition is the condition where the heating capacity of the air conditioning system gradually decreases. For example, during the steady-state operation of the air conditioning system, the evaporator will frost, which will cause the heating capacity of the air conditioning system to decrease, and then the overall steady-state heating condition will change to an unsteady-state heating condition.

[0047] At present, electronic expansion valves are usually used as throttling devices in air-conditioning systems. The control of the opening of the electronic expansion valve is directly related to the heating capacity of the air-conditioning system. In the APF (annual energy consumption rate) performance matching process, the control strategy of EEV (electronic expansion valve) is to control through the target exhaust temperature. However, in non-steady-state heating conditions, the change of the target exhaust temperature is inconsistent with the attenuation trend of the heating capacity of the air-conditioning system, resulting in certain defects in the above control strategy in the non-steady-state heating condition during the APF performance matching process. It cannot reflect the attenuation of the heating capacity of the air-conditioning system in non-steady-state heating conditions.

[0048] Under non-steady-state heating conditions, the above defects lead to uncertainty in adjusting the opening of the electronic expansion valve by changing the target exhaust temperature to further adjust the heating capacity of the air-conditioning system.

[0049] Therefore, based on the above technical problems, an electronic expansion valve control strategy for non-steady-state heating conditions is needed. By improving the electronic expansion valve control strategy for non-steady-state heating conditions, the attenuation of the heating capacity of the air-conditioning system in non-steady-state heating conditions can be better reflected, thereby improving the average heating capacity of the air-conditioning system.

[0050] The air conditioning system includes a steady-state heating condition and an unsteady-state heating condition;

[0051] Among them, the steady-state heating condition is the condition in which the heating capacity of the air-conditioning system is stable, that is, its heating capacity does not decay over time and remains constant; the non-steady-state heating condition is the condition in which the heating capacity of the air-conditioning system gradually decays over time, which is usually caused by factors such as frost.

[0052] Please refer to Figure 1 and Figure 2 As shown, an electronic expansion valve control method includes a steady-state electronic expansion valve control strategy and a non-steady-state heating condition electronic expansion valve control strategy;

[0053] The steady-state electronic expansion valve control strategy is used to control the opening of the electronic expansion valve in the steady-state heating condition of the air-conditioning system, and the non-steady-state heating condition electronic expansion valve control strategy is used to control the opening of the electronic expansion valve in the non-steady-state heating condition of the air-conditioning system.

[0054] like Figure 1 The figure shows the electronic expansion valve control strategy for non-steady-state heating conditions, including:

[0055] The non-steady-state heating condition of the air-conditioning system includes an initial stage and an operating stage; the initial stage refers to the stage when the air-conditioning system is just turned on, during which the heating capacity of the air-conditioning system is in a climbing stage, and when the air-conditioning system runs for a period of time and reaches the operating stage, the heating capacity of the air-conditioning system in this stage is periodically stable.

[0056] In the initial stage, the opening of the electronic expansion valve is controlled by the following steps:

[0057] The electronic expansion valve is opened to the first initial opening; the first initial opening can be obtained based on experimental values ​​or manually set. The first initial opening is generally affected by factors such as the compressor operating frequency, indoor temperature and outdoor temperature. The first initial opening can be obtained by collecting the above data and calculating the first initial opening through the existing EEV opening calculation model. The specific operation of opening the electronic expansion valve to the first initial opening is to start the compressor of the air-conditioning system, and then open the electronic expansion valve in the air-conditioning system to the first initial opening, and maintain the electronic expansion valve in the open state for a first preset time, wherein the first preset time can be determined by experience. The electronic expansion valve maintains the first preset time at the first initial opening to ensure that the air-conditioning system reaches the operating stage after the heating capacity climbing stage.

[0058] During the operation phase, the opening of the electronic expansion valve is controlled by the following steps:

[0059] Get the real-time subcooling of the air conditioning system; the subcooling here refers to the difference between the temperature of the condensed water in the condenser under a certain pressure and the saturation temperature under the corresponding pressure. The real-time subcooling can be calculated by collecting the temperature of the condensed water in the condenser and the saturation temperature in real time to get the standard subcooling. In actual application, in order to facilitate data collection, the difference between the condenser outlet temperature and the middle temperature of the condenser coil or the difference between the exhaust temperature of the air conditioning system and the condenser outlet temperature is usually used as the real-time subcooling, and the real-time subcooling is close to the standard subcooling.

[0060] PID operation is performed according to the real-time subcooling and the target subcooling to obtain the first regulating variable of the opening of the electronic expansion valve, and the opening of the electronic expansion valve is adjusted according to the first regulating variable. PID operation is proportional, integral and differential operation. PID control has the advantages of simple principle, strong robustness and wide applicability. It is a mature technology and the most widely used control system, which will not be described here. During the PID operation process, the deviation between the real-time subcooling and the target subcooling will be fed back to the control system in real time, and the first regulating variable of the opening of the electronic expansion valve will be calculated. After adjusting the opening of the electronic expansion valve by the first regulating variable, the above deviation is eliminated or reduced. Through multiple iterations, the deviation value between the real-time subcooling and the target subcooling is within the set range.

[0061] In order to simplify the calculation of the first adjustment variable, a PID operation can be performed according to the real-time subcooling and the target subcooling, and a first change rate table of the electronic expansion valve opening can be obtained, which is a table of the deviation between the real-time subcooling and the target subcooling and the change rate of the electronic expansion valve opening. The change rate of the electronic expansion valve opening can be obtained through the above deviation, and the change rate is based on the first initial opening. Then, the first target opening value can be calculated based on the first initial opening and the change rate, and the first adjustment variable of the electronic expansion valve opening can be calculated based on the difference between the current opening value and the first target opening value. At this time, it is only necessary to obtain the deviation between the real-time subcooling and the target subcooling and the current electronic expansion valve opening to conveniently obtain the first adjustment variable.

[0062] It is conceivable that the first change rate table may not be provided, and the first adjustment variable may also be directly obtained through PID operation.

[0063] Please continue to refer to Figure 1 As shown, the target subcooling can obtain a suitable range value through experimental data, and the customer determines the range and inputs it into the system. Alternatively, the target subcooling can also be calculated. Usually, the target subcooling is determined by the upper frequency limit, lower frequency limit, operating frequency, exhaust temperature, system charge volume and other parameters of the air-conditioning system compressor. The target subcooling is calculated by fitting the above parameters to form a relevant correlation or by using a built-in algorithm or a user-given algorithm.

[0064] like Figure 2 As shown, it is a steady-state electronic expansion valve control strategy, including:

[0065] The steady-state heating condition of the air-conditioning system includes an initial stage and an operating stage; the initial stage refers to the stage when the air-conditioning system is just turned on, during which the heating capacity of the air-conditioning system is in a climbing stage, and when the air-conditioning system runs for a period of time and reaches the operating stage, the heating capacity of the air-conditioning system in this stage is periodically stable.

[0066] In the initial stage, the opening of the electronic expansion valve is controlled by the following steps:

[0067] Open the electronic expansion valve to the second initial opening; the second initial opening can be obtained based on experimental values ​​or manually set. The second initial opening is generally affected by factors such as the compressor operating frequency, indoor temperature and outdoor temperature. The second initial opening can be calculated by collecting the above data and using the existing EEV opening calculation model. The specific operation of opening the electronic expansion valve to the second initial opening is to start the compressor of the air-conditioning system, and then open the electronic expansion valve in the air-conditioning system to the second initial opening, and maintain the electronic expansion valve open for a second preset time, wherein the second preset time can be determined by experience. The electronic expansion valve maintains the second preset time at the second initial opening in order to ensure that the air-conditioning system reaches the operating stage after the heating capacity climbing stage. The first preset time and the second preset time can be equal, and of course the specific durations of the first preset time and the second preset time can also be adjusted based on the actual working conditions of the air-conditioning system.

[0068] During the operation phase, the opening of the electronic expansion valve is controlled by the following steps:

[0069] Get the real-time exhaust temperature of the air conditioning system; the exhaust temperature here refers to the temperature at the exhaust outlet of the compressor in the air conditioning system.

[0070] A PID operation is performed according to the real-time exhaust temperature and the target exhaust temperature to obtain a second regulating variable of the opening of the electronic expansion valve, and the opening of the electronic expansion valve is adjusted according to the second regulating variable. The PID operation here and the PID operation in the non-steady-state heating condition can use the same PID operation system. Of course, the various parameters in the PID operation system can also be adjusted in real time based on the actual difference between the steady-state heating condition and the non-steady-state heating condition of the air-conditioning system. In the PID operation process here, the deviation between the real-time exhaust temperature and the target exhaust temperature will be fed back to the control system in real time, and the second regulating variable of the opening of the electronic expansion valve will be calculated. After adjusting the opening of the electronic expansion valve by the second regulating variable, the above deviation is eliminated or reduced, and the deviation value between the real-time exhaust temperature and the target exhaust temperature is within the set range through multiple iterations.

[0071] In order to simplify the calculation of the second adjustment variable, a PID operation can be performed according to the real-time exhaust temperature and the target exhaust temperature, and a second change rate table of the electronic expansion valve opening can be obtained, which is a table of the deviation between the real-time exhaust temperature and the target exhaust temperature and the change rate of the electronic expansion valve opening. The change rate of the electronic expansion valve opening can be obtained through the above deviation, and the change rate is based on the second initial opening. Then, the second target opening value can be calculated based on the second initial opening and the change rate, and the second adjustment variable of the electronic expansion valve opening can be calculated based on the difference between the current opening value and the second target opening value. At this time, it is only necessary to obtain the deviation between the real-time exhaust temperature and the target exhaust temperature and the current electronic expansion valve opening to conveniently obtain the second adjustment variable.

[0072] It is conceivable that the second change rate table may not be provided, and the second adjustment variable may also be directly obtained through PID operation.

[0073] Please continue to refer to Figure 2 As shown, the target exhaust temperature can obtain a suitable range value through experimental data, and the customer determines the range and inputs it into the system. Alternatively, the target exhaust temperature can also be calculated. Usually, the target exhaust temperature is determined by the upper frequency limit, lower frequency limit, operating frequency, standard exhaust temperature and other parameters of the compressor of the air-conditioning system. The target exhaust temperature is calculated by fitting the above parameters to form a relevant correlation or by using a built-in algorithm or a user-given algorithm.

[0074] In the steady-state heating condition and the unsteady-state heating condition of the air-conditioning system, it is ensured that the initial stage is not affected by the PID operation. Therefore, in the initial stage, only the PID parameters are input into the PID operation system, and the deviation between the real-time subcooling degree and the target subcooling degree or the deviation between the exhaust temperature and the target exhaust temperature is not input.

[0075] In summary, for the APF performance matching of the air conditioning system, the control method of EEV adopts a control method that combines the target superheat control in steady-state heating conditions with the subcooling control in non-steady-state heating conditions:

[0076] When the air-conditioning system is in steady-state heating conditions during the APF matching process, the above-mentioned target exhaust temperature control strategy effectively improves the problem of excessively high exhaust temperature of the air-conditioning system. At the same time, under steady-state heating conditions, the system circulation flow remains unchanged. Appropriately increasing the target exhaust temperature can increase the exhaust enthalpy value (heating amount per unit mass), which can effectively improve the heating capacity.

[0077] like Figure 3a , Figure 3b and Figure 3cAs shown in the figure, when the air-conditioning system is in non-steady-state heating condition, the subcooling degree is consistent with the low-temperature heating capacity and the flow attenuation trend. Therefore, the attenuation of the system circulation flow under non-steady-state heating condition can be evaluated according to the subcooling degree, so as to adjust the opening of the electronic expansion valve and ensure the average heating capacity of the air-conditioning system.

[0078] The present invention also provides a computer-readable storage medium, which may be a semiconductor, a magnetic core, a magnetic drum, a magnetic tape, or a laser disk. The computer-readable storage medium stores the above-mentioned electronic expansion valve control method by a computer program.

[0079] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0080] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An electronic expansion valve control strategy for non-steady-state heating conditions, characterized in that: The steps include: Opening the electronic expansion valve to a first initial opening degree; Get the real-time subcooling degree of the air conditioning system; A PID operation is performed according to the real-time subcooling degree and the target subcooling degree to obtain a first regulating variable of the opening degree of the electronic expansion valve, and the opening degree of the electronic expansion valve is adjusted according to the first regulating variable.

2. The electronic expansion valve control strategy for non-steady-state heating conditions according to claim 1, characterized in that: The real-time subcooling degree is the difference between the condenser outlet temperature and the middle temperature of the condenser coil or the difference between the exhaust temperature of the air conditioning system and the condenser outlet temperature.

3. The electronic expansion valve control strategy for non-steady-state heating conditions according to claim 1, characterized in that: The performing of PID calculation according to the real-time subcooling degree and the target subcooling degree to obtain the first regulating variable of the electronic expansion valve opening degree comprises: A PID operation is performed according to the real-time subcooling degree and the target subcooling degree, and a first change rate table of the electronic expansion valve opening degree is obtained. A first adjustment variable of the electronic expansion valve opening degree is calculated based on the first change rate table.

4. The electronic expansion valve control strategy for non-steady-state heating conditions according to claim 1, characterized in that: The non-steady-state heating condition of the air conditioning system includes an initial stage and an operating stage; In the initial stage, the electronic expansion valve is opened to the first initial opening degree; During the operation phase, the real-time supercooling degree of the air-conditioning system is obtained and the opening degree of the electronic expansion valve is adjusted.

5. The electronic expansion valve control strategy for non-steady-state heating conditions according to claim 1, characterized in that: The step of opening the electronic expansion valve to a first initial opening degree comprises: Turn on the air conditioning system's compressor; Opening the electronic expansion valve in the air conditioning system to a first initial opening degree; The electronic expansion valve is maintained in an open state for a first preset time.

6. An electronic expansion valve control method, characterized in that: The air conditioning system includes steady-state heating conditions and unsteady-state heating conditions; When the air conditioning system is in the non-steady-state heating condition, the opening of the electronic expansion valve is controlled by the non-steady-state heating condition electronic expansion valve control strategy according to any one of claims 1 to 5; In the steady-state heating condition, the air conditioning system controls the opening of the electronic expansion valve through the following steps: opening the electronic expansion valve to a second initial opening degree; Get the real-time exhaust temperature of the air conditioning system; A PID operation is performed according to the real-time exhaust temperature and the target exhaust temperature to obtain a second regulating variable of the opening of the electronic expansion valve, and the opening of the electronic expansion valve is adjusted according to the second regulating variable.

7. The electronic expansion valve control method according to claim 6, characterized in that: Performing PID calculation according to the real-time exhaust temperature and the target exhaust temperature to obtain a second regulating variable of the electronic expansion valve opening includes: A PID operation is performed according to the real-time exhaust temperature and the target exhaust temperature to obtain a second change rate table of the electronic expansion valve opening, and a second adjustment variable of the electronic expansion valve opening is calculated based on the second change rate table.

8. The electronic expansion valve control method according to claim 6, characterized in that: The air conditioning system includes an initial stage and an operating stage in a steady-state heating condition; In the initial stage, the electronic expansion valve is opened to the second initial opening degree; During the operation phase, the exhaust temperature of the air conditioning system is obtained and the opening of the electronic expansion valve is adjusted.

9. The electronic expansion valve control method according to claim 6, characterized in that: The step of opening the electronic expansion valve to a second initial opening degree comprises: Turn on the air conditioning system's compressor; opening the electronic expansion valve in the air conditioning system to a second initial opening degree; The electronic expansion valve is maintained in the open state for a second preset time.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the electronic expansion valve control method according to any one of claims 6 to 9 is implemented.

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