Control method and device of electronic expansion valve, medium and heat pump system

Abstract

The invention provides a control method and device of an electronic expansion valve, a medium and a heat pump system.The method is applied to the field of heat pump control and comprises the steps that the exhaust temperature of the heat pump system is obtained in real time, and the gas heating rate is obtained according to the target duration corresponding to the preset temperature interval where the exhaust temperature is located; and a target opening degree is determined according to the heating rate and the current opening degree of the electronic expansion valve, and the electronic expansion valve is controlled according to the target opening degree. The electronic expansion valve is gradually adjusted in the rising process of the exhaust temperature, the rising speed of the exhaust temperature can be slowed down in advance, the situation of exhaust frequency limitation or exhaust protection is prevented, and the stability of a heat pump system is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of heat pump control, and more specifically, to a control method, device, medium and heat pump system of an electronic expansion valve in the field of heat pump control. Background Art

[0002] The heat pump system controls the flow of refrigerant entering the evaporator through an electronic expansion valve, thereby controlling the exhaust temperature at the compressor outlet. In the related art, the heat pump system adjusts the opening of the electronic expansion valve according to the subcooling at the condenser outlet or the exhaust superheat at the compressor outlet to ensure the stability of the system and improve the heating efficiency. However, in a low-temperature environment, the heat pump system has a certain lag in temperature changes, and the exhaust superheat is slow to build up. At this time, the opening of the electronic expansion valve will basically be adjusted to the minimum. When the exhaust superheat is built up to the point where the exhaust temperature rises rapidly, the electronic expansion valve cannot adjust the opening in time, which can easily lead to exhaust frequency limiting or exhaust protection. Summary of the invention

[0003] The present application provides a control method, device, medium and heat pump system for an electronic expansion valve. The method can gradually adjust the electronic expansion valve by real-time detecting the temperature rise rate of the gas discharged by the compressor of the heat pump system, thereby slowing down the rate of increase of the exhaust temperature in advance, preventing the occurrence of exhaust frequency limiting or exhaust protection, and ensuring the stability of the heat pump system.

[0004] In a first aspect, a control method for an electronic expansion valve is provided, the method comprising: obtaining the exhaust temperature of the gas discharged by the compressor of a heat pump system; if the exhaust temperature is within a preset temperature range, obtaining a target heating rate of the gas within a target time period corresponding to the preset temperature range; determining a target opening of the electronic expansion valve based on the target heating rate and a current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening.

[0005] Through the above technical scheme, the temperature rise rate of the gas discharged by the compressor of the heat pump system is detected in real time, and the electronic expansion valve is gradually adjusted to slow down the rate of increase of the exhaust temperature in advance, prevent the occurrence of exhaust frequency limiting or exhaust protection, and ensure the stability of the heat pump system.

[0006] In combination with the first aspect, in some possible implementations, if the exhaust temperature is within the preset temperature range, the step of obtaining the target heating rate of the gas within the target time corresponding to the preset temperature range includes: if the exhaust temperature is within the preset temperature range, obtaining the target time corresponding to the preset temperature range; determining the target heating rate of the gas based on the temperature change value of the gas within the target time.

[0007] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the preset temperature interval is a first temperature interval, and if the exhaust temperature is within the preset temperature interval, the step of obtaining the target time corresponding to the preset temperature interval includes: if the exhaust temperature is within the first temperature interval, obtaining the first target time corresponding to the first temperature interval; the step of determining the target heating rate of the gas based on the temperature change value of the gas within the target time includes: obtaining the first temperature change value of the gas within the first target time; and determining the ratio of the first temperature change value to the first target time as the first target heating rate of the gas.

[0008] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the preset temperature interval is a second temperature interval, and if the exhaust temperature is within the preset temperature interval, the step of obtaining the target duration corresponding to the preset temperature interval includes: if the exhaust temperature is within the second temperature interval, obtaining the second target duration corresponding to the second temperature interval, and the second target duration is less than the first target duration; the step of determining the target heating rate of the gas based on the temperature change value of the gas within the target duration includes: obtaining the second temperature change value of the gas within the second target duration; and determining the ratio of the second temperature change value to the second target duration as the second target heating rate of the gas.

[0009] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the preset temperature interval is a third temperature interval, and if the exhaust temperature is within the preset temperature interval, the step of obtaining the target time corresponding to the preset temperature interval includes: if the exhaust temperature is within the third temperature interval, obtaining the third target time corresponding to the third temperature interval, and the third target time is less than the second target time; the step of determining the target heating rate of the gas based on the temperature change value of the gas within the target time includes: obtaining the third temperature change value of the gas within the third target time; and determining the ratio of the third temperature change value to the third target time as the third target heating rate of the gas.

[0010] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the target opening of the electronic expansion valve is determined based on the target heating rate and the current opening of the electronic expansion valve of the heat pump system, and the step of controlling the electronic expansion valve based on the target opening includes: if the target heating rate is greater than the preset heating rate, determining the target opening coefficient based on the target heating rate or the preset heating rate; determining the target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening.

[0011] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the preset temperature interval is a first temperature interval, and if the target heating rate is greater than the preset heating rate, the step of determining the target opening coefficient based on the target heating rate or the preset heating rate includes: if the first target heating rate is greater than the first preset heating rate, then multiplying the first target heating rate or the first preset heating rate by the first preset gain factor corresponding to the first temperature interval as the first target opening coefficient; the step of determining the target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening includes: determining the product of the current opening of the electronic expansion valve of the heat pump system and the first target opening coefficient as the first target opening increase value of the electronic expansion valve; determining the sum of the current opening and the first target opening increase value as the first target opening of the electronic expansion valve, and controlling the electronic expansion valve based on the first target opening.

[0012] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the preset temperature interval is a second temperature interval, and if the target heating rate is greater than the preset heating rate, the step of determining the target opening coefficient based on the target heating rate or the preset heating rate includes: if the second target heating rate is greater than the second preset heating rate, the product of the second target heating rate or the second preset heating rate and the second preset gain factor corresponding to the second temperature interval is determined as the second target opening coefficient, the second preset heating rate is less than the first preset heating rate, and the second preset gain factor is greater than the first preset gain factor; the step of determining the target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening includes: determining the product of the current opening of the electronic expansion valve of the heat pump system and the second target opening coefficient as the second target opening increase value of the electronic expansion valve; determining the sum of the current opening and the second target opening increase value as the second target opening of the electronic expansion valve, and controlling the electronic expansion valve based on the second target opening.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the preset temperature interval is a third temperature interval, and if the target heating rate is greater than the preset heating rate, the step of determining the target opening coefficient based on the target heating rate or the preset heating rate includes: if the third target heating rate is greater than the third preset heating rate, the product of the third target heating rate or the third preset heating rate and the third preset gain factor corresponding to the third temperature interval is determined as the third target opening coefficient, the third preset heating rate is less than the second preset heating rate, and the third preset gain factor is greater than the second preset gain factor; the step of determining the target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening includes: determining the product of the current opening of the electronic expansion valve of the heat pump system and the third target opening coefficient as the third target opening increase value of the electronic expansion valve; determining the sum of the current opening and the third target opening increase value as the third target opening of the electronic expansion valve, and controlling the electronic expansion valve based on the third target opening.

[0014] In a second aspect, a control device for an electronic expansion valve is provided, the device comprising:

[0015] An exhaust temperature acquisition unit, used to acquire the exhaust temperature of the gas discharged by the compressor of the heat pump system;

[0016] A heating rate acquisition unit, for acquiring a target heating rate of the gas within a target time period corresponding to the preset temperature interval if the exhaust temperature is within the preset temperature interval;

[0017] The expansion valve control unit is used to determine the target opening of the electronic expansion valve based on the target heating rate and the current opening of the electronic expansion valve of the heat pump system, and control the electronic expansion valve based on the target opening.

[0018] In a third aspect, a heat pump system is provided, the heat pump system comprising: a memory for storing executable program code;

[0019] A processor is used to call and run executable program code from a memory to execute the method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

[0020] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0021] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a system architecture diagram of a control method for an electronic expansion valve provided in an embodiment of the present application;

[0023] Figure 2 It is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application;

[0024] Figure 3 It is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application;

[0025] Figure 4 It is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application;

[0026] Figure 5 is a structural schematic diagram of a control device for an electronic expansion valve provided in an embodiment of the present application;

[0027] Figure 6 It is a structural schematic diagram of a heat pump system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0029] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0030] See also Figure 1 , Figure 1 is a system architecture diagram of a heat pump system provided in an embodiment of the present application. Figure 1As shown, the control method of the electronic expansion valve provided in the embodiment of the present application can be applied to the electronic expansion valve control scenario of the heat pump system. The heat pump system 10 includes an evaporator 11, a compressor 12, a condenser 13 and an electronic expansion valve 14. The evaporator 11 is a device for absorbing heat in the heat pump system 10. The compressor 12 is a core component of the heat pump system 10, which is used to compress the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The condenser 13 is a device for releasing heat in the heat pump system 10. The electronic expansion valve 14 is a device for adjusting the refrigerant flow in the heat pump system 10. The working process of the heat pump system 10 is as follows: in the evaporator 11, the liquid refrigerant absorbs heat from the surrounding environment and evaporates into a gaseous refrigerant. The evaporated gaseous refrigerant is sucked into the compressor 12 and becomes a high-temperature and high-pressure gaseous refrigerant after compression. The high-temperature and high-pressure gaseous refrigerant is discharged from the compressor 12 and enters the condenser 13, where it releases heat and condenses into a liquid. The condensed liquid refrigerant is depressurized by the electronic expansion valve 14 and then enters the evaporator 11 for the next cycle.

[0031] In the related art, the opening of the electronic expansion valve of the heat pump system is controlled by the subcooling at the outlet of the condenser or the exhaust superheat at the outlet of the compressor. When the ambient temperature is low, the exhaust superheat builds up slowly, and the electronic expansion valve will be adjusted to a lower opening. However, the gaseous refrigerant heats up and pressurizes rapidly in the compressor, and the exhaust temperature rises rapidly. The electronic expansion valve cannot adjust the opening in time to reduce the exhaust temperature, which eventually leads to exhaust frequency limiting or exhaust protection. Both exhaust frequency limiting and exhaust protection will affect the stability of the heat pump system. Exhaust frequency limiting is to limit the operating frequency of the heat pump system, to limit and adjust the exhaust process, and to prevent the exhaust temperature from being too high. Exhaust protection is a protective measure taken in the heat pump system to prevent the exhaust temperature from being too high. For example, when the exhaust temperature is too high, the exhaust temperature protector will automatically cut off the power supply or adjust the operating state of the heat pump to prevent the exhaust temperature from continuing to rise.

[0032] Based on the above problems, the embodiment of the present application provides a control method for an electronic expansion valve, which obtains the exhaust temperature of the heat pump system in real time, obtains the temperature rise rate of the gas according to the target time corresponding to the preset temperature range of the exhaust temperature, and then determines the target opening according to the temperature rise rate and the current opening of the electronic expansion valve, and controls the electronic expansion valve according to the target opening. By gradually adjusting the electronic expansion valve during the rising process of the exhaust temperature, the rate of increase of the exhaust temperature can be slowed down in advance, preventing the occurrence of exhaust frequency limiting or exhaust protection, and ensuring the stability of the heat pump system.

[0033] based on Figure 1 The system architecture diagram shown below will be combined with Figure 2-Figure 4 , the control method of the electronic expansion valve provided in the embodiment of the present application is introduced in detail.

[0034] See also Figure 2 , Figure 2 1 is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application. Figure 2 As shown, the method of the embodiment of the present application may include the following steps S101-S103.

[0035] S101, obtaining the exhaust temperature of the gas discharged by the compressor of the heat pump system;

[0036] Specifically, the exhaust temperature of the gas discharged by the compressor of the heat pump system is obtained in real time. The compressor inhales the evaporated gaseous refrigerant and compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. Therefore, the gas discharged by the compressor is a high-temperature and high-pressure gas. When obtaining the exhaust temperature, the exhaust temperature can be directly measured and displayed by the built-in temperature sensor of the heat pump system, or the exhaust temperature can be obtained by an external temperature sensor of the heat pump system, such as installing a temperature sensor at the outlet of the compressor.

[0037] S102, if the exhaust gas temperature is within a preset temperature range, obtaining a target heating rate of the gas within a target time period corresponding to the preset temperature range;

[0038] Specifically, after obtaining the exhaust temperature, if the exhaust temperature is within the preset temperature range, the target time corresponding to the preset temperature range is obtained, and then the temperature change value of the gas discharged by the compressor within the target time is obtained, and the target heating rate of the gas within the target time is determined according to the temperature change value and the target time. If the exhaust temperature is not within the preset temperature range, the electronic expansion valve is directly controlled according to the exhaust superheat or exhaust temperature. The preset temperature range is a plurality of temperature ranges set in advance according to the maximum exhaust temperature that the compressor can withstand and the different effects of different temperatures on the electronic expansion valve. The endpoints of the preset temperature range are the values ​​determined by the developers in multiple tests.

[0039] S103, determining a target opening of the electronic expansion valve based on the target heating rate and the current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening.

[0040] Specifically, based on the acquired target heating rate and the current opening of the electronic expansion valve, the target opening of the electronic expansion valve is determined, and then the electronic expansion valve is controlled based on the target opening. In the heat pump system, the larger the opening of the electronic expansion valve, the greater the flow of the refrigerant in the system, and more refrigerant enters the evaporator, making the evaporation process in the evaporator more complete, the gaseous refrigerant increases, and the liquid refrigerant decreases, and the two tend to a balanced state, that is, the refrigerant state at the outlet of the evaporator is closer to the saturation state, and even enters a supercooling state. In this case, the temperature of the gaseous refrigerant entering the compressor is relatively low, and accordingly, the temperature of the gaseous refrigerant discharged by the compressor will also decrease. Therefore, when the exhaust temperature exceeds the safety temperature threshold, it can be considered that the exhaust temperature is high, and the target opening of the electronic expansion valve can be determined according to the target heating rate and the current opening of the electronic expansion valve, and the opening of the electronic expansion valve can be appropriately increased to reduce the heating rate of the exhaust temperature or directly reduce the exhaust temperature.

[0041] In the embodiment of the present application, the exhaust temperature of the heat pump system is obtained in real time, the temperature rise rate of the gas is obtained according to the target time corresponding to the preset temperature range of the exhaust temperature, and then the target opening is determined according to the temperature rise rate and the current opening of the electronic expansion valve, and the electronic expansion valve is controlled according to the target opening. By gradually adjusting the electronic expansion valve during the rising process of the exhaust temperature, the rate of increase of the exhaust temperature can be slowed down in advance, the occurrence of exhaust frequency limiting or exhaust protection can be prevented, and the stability of the heat pump system can be ensured.

[0042] See also Figure 3 , Figure 3 1 is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application. Figure 3 As shown, the method of the embodiment of the present application may include the following steps S201-S204.

[0043] S201, obtaining the exhaust temperature of the gas discharged by the compressor of the heat pump system;

[0044] Specifically, the exhaust temperature of the gas discharged by the compressor of the heat pump system is obtained in real time. The compressor inhales the evaporated gaseous refrigerant and compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. Therefore, the gas discharged by the compressor is a high-temperature and high-pressure gas. When obtaining the exhaust temperature, the exhaust temperature can be directly measured and displayed by the built-in temperature sensor of the heat pump system, or the exhaust temperature can be obtained by an external temperature sensor of the heat pump system, such as installing a temperature sensor at the outlet of the compressor.

[0045] S202, if the exhaust gas temperature is within a preset temperature range, obtaining a target duration corresponding to the preset temperature range, and determining a target heating rate of the gas based on a temperature change value of the gas within the target duration;

[0046] Specifically, if the exhaust temperature is within the preset temperature range, the target duration corresponding to the preset temperature range is obtained. After the target duration is determined, the temperature change value of the gas within the target duration is obtained, and the target temperature rise rate of the gas is determined based on the temperature change value and the target duration. The electronic expansion valve is controlled according to the target temperature rise rate, and the target temperature rise rate is periodically obtained at each target duration interval to improve the timeliness of the control of the electronic expansion valve. If the exhaust temperature is not within the preset temperature range, the electronic expansion valve is directly controlled according to the exhaust superheat or exhaust temperature. The preset temperature range is a plurality of temperature ranges set in advance based on the maximum exhaust temperature that the compressor can withstand and the different effects of different temperatures on the electronic expansion valve. The endpoints of the preset temperature range are the values ​​determined by the developers in multiple tests.

[0047] The preset temperature interval provided in the embodiment of the present application includes three temperature intervals, namely, the first temperature interval, the second temperature interval and the third temperature interval. If the exhaust temperature is within the first temperature interval, the first target duration corresponding to the first temperature interval is obtained, and then the first temperature change value of the gas within the first target duration is obtained, and the ratio of the first temperature change value to the first target duration is determined as the first target heating rate of the gas. If the exhaust temperature is within the second temperature interval, the second target duration corresponding to the second temperature interval is obtained, and then the second temperature change value of the gas within the second target duration is obtained, and the ratio of the second temperature change value to the second target duration is determined as the second target heating rate of the gas. If the exhaust temperature is within the third temperature interval, the third target duration corresponding to the third temperature interval is obtained, and then the third temperature change value of the gas within the third target duration is obtained, and the ratio of the third temperature change value to the third target duration is determined as the third target heating rate of the gas.

[0048] Among them, the temperature values ​​in the first temperature interval are all lower than the temperature values ​​in the second temperature interval, the temperature values ​​in the second temperature interval are all lower than the temperature values ​​in the third temperature interval, the second target duration is less than the first target duration, and the third target duration is less than the second target duration. When the exhaust temperature is low, the heating rate is also slow. In order to accurately obtain the heating rate of the gas, the target duration of the temperature interval with lower temperature values ​​is greater than the target duration of the temperature interval with higher temperature values. For example, the maximum exhaust temperature that the compressor can withstand is 110°C, the first temperature interval is [85,90), the second temperature interval is [90,95), and the third temperature interval is [95,100). The first target duration is 30s, the second target duration is 20s, and the third target duration is 10s.

[0049] S203, if the target heating rate is greater than the preset heating rate, determining a target opening coefficient based on the target heating rate or the preset heating rate;

[0050] Specifically, the target heating rate is compared with the preset heating rate. If the target heating rate is greater than the preset heating rate, the product of the target heating rate or the preset heating rate and the preset gain factor is determined as the target opening coefficient. If the target heating rate is less than or equal to the preset heating rate, the electronic expansion valve is directly controlled according to the exhaust superheat or the exhaust temperature. Among them, the preset heating rate is the minimum heating rate that affects the opening of the electronic expansion valve, and each preset temperature range corresponds to a preset heating rate. Since the preset heating rate and the target heating rate may be very small values, the preset gain factor is used to amplify the preset heating rate or the target heating rate to improve the control accuracy of the electronic expansion valve. The specific value of the preset gain factor is the value determined by the developer through multiple experiments.

[0051] It should be noted that since the preset heating rate is the minimum heating rate that affects the opening of the electronic expansion valve, if the product of the preset heating rate and the preset gain factor is determined as the target opening coefficient, the target opening coefficient is a fixed value. Therefore, the electronic expansion valve is gradually adjusted with a smaller fixed value. However, the target heating rate is a real-time changing value. If the product of the target heating rate and the preset gain factor is determined as the target opening coefficient, the target opening coefficient is a changing value. Therefore, if the target opening coefficient is determined by the product of the target heating rate and the preset gain factor, it is necessary to pre-set the target opening coefficient threshold. When the product of the target heating rate and the preset gain factor is greater than the target opening coefficient threshold, the target opening coefficient threshold is determined as the target opening coefficient to ensure that the control of the electronic expansion valve is gradually adjusted to prevent the exhaust temperature from dropping suddenly.

[0052] If the exhaust temperature is within the first temperature range, the first target temperature rise rate is compared with the first preset temperature rise rate. If the first target temperature rise rate is greater than the first preset temperature rise rate, the first target temperature rise rate or the first preset temperature rise rate is multiplied by the first preset gain factor corresponding to the first temperature range to determine the first target opening coefficient. If the exhaust temperature is within the second temperature range, the second target soundprint rate is compared with the second preset temperature rise rate. If the second target temperature rise rate is greater than the second preset temperature rise rate, the second target temperature rise rate or the second preset temperature rise rate is multiplied by the second preset gain factor corresponding to the second temperature range to determine the second target opening coefficient. If the exhaust temperature is within the third temperature range, the third target soundprint rate is compared with the third preset temperature rise rate. If the third target temperature rise rate is greater than the third preset temperature rise rate, the third target temperature rise rate or the third preset temperature rise rate is multiplied by the third preset gain factor corresponding to the third temperature range to determine the third target opening coefficient.

[0053] Among them, the second preset heating rate is less than the first preset heating rate, and the third preset heating rate is less than the third preset heating rate. The second preset gain factor is greater than the first preset gain factor, and the third preset gain factor is greater than the second preset gain factor. Since the temperature values ​​of the second temperature interval are greater than the temperature values ​​of the first temperature interval, and the temperature values ​​of the third temperature interval are greater than the temperature values ​​of the second temperature interval, the higher the temperature, the easier it is to cause exhaust frequency limiting and exhaust protection. Therefore, the preset heating rate of the interval with a higher temperature value should be less than the preset heating rate of the interval with a lower temperature value, so as to control the electronic expansion valve in time. The higher the temperature value, the greater the degree of control over the electronic expansion valve, therefore, the preset gain factor of the interval with a higher temperature value is greater than the preset gain factor of the interval with a lower temperature value. Taking the maximum exhaust temperature that the compressor can withstand in step S202 as 110°C as an example, the first preset heating rate can be 0.05, the second preset heating rate can be 0.04, and the third preset heating rate can be 0.03. The first preset gain factor can be 10, the second preset gain factor can be 20, and the third preset gain factor can be 30.

[0054] S204, determining a target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening.

[0055] Specifically, after determining the target opening coefficient, the product of the current opening of the electronic expansion valve and the target opening coefficient is determined as the target opening increase value of the electronic expansion valve, and the sum of the current opening and the target opening increase value is the target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the target opening. In the heat pump system, the larger the opening of the electronic expansion valve, the greater the flow of the refrigerant in the system, and more refrigerant enters the evaporator, making the evaporation process in the evaporator more complete, the gaseous refrigerant increases, and the liquid refrigerant decreases, and the two tend to a balanced state, that is, the refrigerant state at the outlet of the evaporator is closer to the saturated state, and even enters a supercooled state. In this case, the temperature of the gaseous refrigerant entering the compressor is relatively low, and accordingly, the temperature of the gaseous refrigerant discharged by the compressor will also decrease. Therefore, when the exhaust temperature exceeds the safety temperature threshold, it can be considered that the exhaust temperature is high, and the target opening of the electronic expansion valve can be determined according to the target heating rate and the current opening of the electronic expansion valve, and the opening of the electronic expansion valve can be appropriately increased to reduce the heating rate of the exhaust temperature or directly reduce the exhaust temperature.

[0056] If the exhaust temperature is within the first temperature range, the product of the current opening of the electronic expansion valve and the first target opening coefficient is determined as the first target opening increase value of the electronic expansion valve, the sum of the current opening and the first target opening increase value is determined as the first target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the first target opening. If the exhaust temperature is within the second temperature range, the product of the current opening of the electronic expansion valve and the second target opening coefficient is determined as the second target opening increase value of the electronic expansion valve, the sum of the current opening and the second target opening increase value is determined as the second target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the second target opening. If the exhaust temperature is within the third temperature range, the product of the current opening of the electronic expansion valve and the third target opening coefficient is determined as the third target opening increase value of the electronic expansion valve, the sum of the current opening and the third target opening increase value is determined as the third target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the third target opening.

[0057] See also Figure 4 , Figure 4 1 is a flow chart of a control method of an electronic expansion valve provided in an embodiment of the present application. Figure 4 As shown, if the exhaust temperature is T, the current opening of the electronic expansion valve is K, the first target duration is t1, the second target duration is t2, the third target duration is t3, the first preset heating rate is v1, the second preset heating rate is v2, the third preset heating rate is v3, the first preset gain factor is m1, the second preset gain factor is m2, and the third preset gain factor is m3. After the heat pump system is started, the exhaust temperature is obtained in real time to determine whether the exhaust temperature is within the preset temperature range. If the exhaust temperature is not within the preset temperature range, or the exhaust temperature is within the preset temperature range but the target heating rate of the gas is less than or equal to the preset heating rate, the electronic expansion valve is directly controlled according to the exhaust superheat or the exhaust temperature. If the exhaust temperature is in the first temperature range, the first target heating rate V1 is T n -T n-t1 / t1, if T n -T n-t1 / t1 is greater than v1, then the first target opening k1 is K+K*m1*v1 or K+K*m1*V1. If the exhaust temperature is in the second temperature range, then the second target heating rate V2 is T n -T n-t2 / t2, if T n -T n-t2 / t2 is greater than v2, then the second target opening k2 is K+K*m2*v2 or K+K*m2*V2. If the exhaust temperature is in the third temperature range, then the third target heating rate V3 is T n -T n-t3 / t3, if T n -Tn-t3 / t3 is greater than v3, then the third target opening k3 is K+K*m3*v3 or K+K*m3*V3.

[0058] In an embodiment of the present application, the exhaust temperature of the heat pump system is obtained in real time, and a preset temperature interval is determined according to the exhaust temperature, and then the target duration corresponding to the preset temperature interval is determined, and the ratio of the temperature change value of the gas within the target duration to the target duration is determined as the target heating rate. When the target heating rate is greater than the preset heating rate, the target heating rate or the preset heating rate is multiplied by the preset gain factor as the target opening coefficient, and then the target opening increase value is determined as the product of the target opening coefficient and the current opening of the electronic expansion valve, and the target opening is the sum of the target opening increase value and the current opening. The embodiment of the present application gradually adjusts the electronic expansion valve during the rising process of the exhaust temperature, which can slow down the rate of increase of the exhaust temperature in advance, prevent the occurrence of exhaust frequency limiting or exhaust protection, and ensure the stability of the heat pump system. At the same time, different target durations, preset heating rates and preset gain factors are set for different temperature intervals, which improves the flexibility and timeliness of the control of the electronic expansion valve.

[0059] based on Figure 1 The system architecture diagram will be combined with Figure 5 , the control device of the electronic expansion valve provided in the embodiment of the present application is introduced in detail. It should be noted that, Figure 5 The electronic expansion valve control device is used to implement the present application Figure 2-Figure 4 For the convenience of explanation, only the part related to the embodiment of the present application is shown. For the specific technical details not disclosed, please refer to the present application. Figure 2-Figure 4 The embodiment shown.

[0060] See also Figure 5 , Figure 5 Schematic diagram of the structure of a control device for an electronic expansion valve provided in an embodiment of the present application. Figure 5 As shown, the electronic expansion valve control device 1 of the embodiment of the present application may include: an exhaust temperature acquisition unit 11, a heating rate acquisition unit 12 and an expansion valve control unit 13.

[0061] The exhaust temperature acquisition unit 11 is used to acquire the exhaust temperature of the gas discharged by the compressor of the heat pump system;

[0062] A heating rate acquisition unit 12 is used to acquire a target heating rate of the gas within a target time period corresponding to the preset temperature interval if the exhaust temperature is within the preset temperature interval;

[0063] The expansion valve control unit 13 is used to determine a target opening of the electronic expansion valve based on the target heating rate and the current opening of the electronic expansion valve of the heat pump system, and control the electronic expansion valve based on the target opening.

[0064] Optionally, the heating rate acquisition unit 12 is specifically used to acquire the target duration corresponding to the preset temperature interval if the exhaust temperature is within the preset temperature interval;

[0065] The target heating rate of the gas is determined based on the temperature change value of the gas within the target time period.

[0066] Optionally, the preset temperature interval is a first temperature interval, and the heating rate acquisition unit 12 is specifically used to acquire a first target duration corresponding to the first temperature interval if the exhaust temperature is within the first temperature interval;

[0067] Obtaining a first temperature change value of the gas within a first target time period;

[0068] The ratio of the first temperature change value to the first target time length is determined as the first target temperature increase rate of the gas.

[0069] Optionally, the preset temperature interval is a second temperature interval, and the heating rate acquisition unit 12 is specifically used to acquire a second target duration corresponding to the second temperature interval if the exhaust temperature is within the second temperature interval, and the second target duration is less than the first target duration;

[0070] Obtaining a second temperature change value of the gas within a second target time period;

[0071] The ratio of the second temperature change value to the second target time length is determined as the second target temperature increase rate of the gas.

[0072] Optionally, the preset temperature interval is a third temperature interval, and the heating rate acquisition unit 12 is specifically used to acquire a third target duration corresponding to the third temperature interval if the exhaust temperature is within the third temperature interval, and the third target duration is less than the second target duration;

[0073] Obtaining a third temperature change value of the gas within a third target time period;

[0074] The ratio of the third temperature change value to the third target time length is determined as the third target temperature rise rate of the gas.

[0075] Optionally, the expansion valve control unit 13 is specifically configured to determine a target opening coefficient based on the target heating rate or the preset heating rate if the target heating rate is greater than the preset heating rate;

[0076] Based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, a target opening of the electronic expansion valve is determined, and the electronic expansion valve is controlled based on the target opening.

[0077] Optionally, the preset temperature interval is a first temperature interval, and the expansion valve control unit 13 is specifically configured to determine the first target temperature rise rate or the first preset temperature rise rate, multiplied by a first preset gain factor corresponding to the first temperature interval, as the first target opening coefficient if the first target temperature rise rate is greater than the first preset temperature rise rate;

[0078] The product of the current opening of the electronic expansion valve of the heat pump system and the first target opening coefficient is determined as the first target opening increase value of the electronic expansion valve;

[0079] The sum of the current opening and the first target opening increase value is determined as the first target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the first target opening.

[0080] Optionally, the preset temperature interval is a second temperature interval, and the expansion valve control unit 13 is specifically configured to determine the second target temperature rise rate or the second preset temperature rise rate, and the product of the second target temperature rise rate and the second preset gain factor corresponding to the second temperature interval as the second target opening coefficient if the second target temperature rise rate is greater than the second preset temperature rise rate, the second preset temperature rise rate is less than the first preset temperature rise rate, and the second preset gain factor is greater than the first preset gain factor;

[0081] The product of the current opening of the electronic expansion valve of the heat pump system and the second target opening coefficient is determined as the second target opening increase value of the electronic expansion valve;

[0082] The sum of the current opening and the second target opening increase value is determined as the second target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the second target opening.

[0083] Optionally, the preset temperature interval is a third temperature interval, and the expansion valve control unit 13 is specifically used to determine the third target temperature rise rate or the third preset temperature rise rate, and the product of the third preset gain factor corresponding to the third temperature interval as the third target opening coefficient if the third target temperature rise rate is greater than the third preset temperature rise rate, the third preset temperature rise rate is less than the second preset temperature rise rate, and the third preset gain factor is greater than the second preset gain factor;

[0084] The product of the current opening of the electronic expansion valve of the heat pump system and the third target opening coefficient is determined as the third target opening increase value of the electronic expansion valve;

[0085] The sum of the current opening and the third target opening increase value is determined as the third target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the third target opening.

[0086] In an embodiment of the present application, the exhaust temperature of the heat pump system is obtained in real time, and a preset temperature interval is determined according to the exhaust temperature, and then the target duration corresponding to the preset temperature interval is determined, and the ratio of the temperature change value of the gas within the target duration to the target duration is determined as the target heating rate. When the target heating rate is greater than the preset heating rate, the target heating rate or the preset heating rate is multiplied by the preset gain factor as the target opening coefficient, and then the target opening increase value is determined as the product of the target opening coefficient and the current opening of the electronic expansion valve, and the target opening is the sum of the target opening increase value and the current opening. The embodiment of the present application gradually adjusts the electronic expansion valve during the rising process of the exhaust temperature, which can slow down the rate of increase of the exhaust temperature in advance, prevent the occurrence of exhaust frequency limiting or exhaust protection, and ensure the stability of the heat pump system. At the same time, different target durations, preset heating rates and preset gain factors are set for different temperature intervals, which improves the flexibility and timeliness of the control of the electronic expansion valve.

[0087] See also Figure 6 , Figure 6 It is a structural schematic diagram of a heat pump system provided in an embodiment of the present application.

[0088] For example, Figure 6 As shown, the heat pump system 600 includes: a processor 601 and a memory 602, wherein the processor 601 is electrically connected to the memory 602.

[0089] The processor 601 is the control center of the heat pump system 600 and may include one or more processing cores. The processor 601 uses various interfaces and lines to connect the various parts of the entire heat pump system, and executes various functions of the heat pump system and processes data by running or calling the computer program stored in the memory 602, and calling the data stored in the memory 602, so as to control the heat pump system 600 as a whole. Optionally, the processor 601 can be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 601 can integrate one or a combination of CPU, graphics processing unit (GPU), modem, etc. Among them, the CPU mainly processes the operating system, user pages and applications, etc.; the GPU is responsible for rendering and drawing the display content; the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 601, but implemented separately through a communication chip.

[0090] The memory 602 can be used to store software programs and modules, and the processor 601 executes various functional applications and data processing by running the computer programs and modules stored in the memory 602. The memory 602 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, a computer program required for at least one function, etc.; the data storage area can store data created according to the use of the heat pump system 600, etc.

[0091] In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 602 may also include a memory controller to provide the processor 601 with access to the memory 602.

[0092] In this embodiment, the processor 601 in the heat pump system 600 loads instructions corresponding to the processes of one or more computer programs into the memory 602 according to the following steps, and the processor 601 runs the computer program stored in the memory 602 to implement various functions, as follows:

[0093] Obtaining the exhaust temperature of the gas discharged by the compressor of the heat pump system;

[0094] If the exhaust gas temperature is within the preset temperature range, the target heating rate of the gas within the target time corresponding to the preset temperature range is obtained;

[0095] Based on the target temperature increase rate and the current opening of the electronic expansion valve of the heat pump system, a target opening of the electronic expansion valve is determined, and the electronic expansion valve is controlled based on the target opening.

[0096] Optionally, when the processor 601 executes the process of obtaining a target heating rate of the gas within a target time period corresponding to the preset temperature range if the exhaust temperature is within the preset temperature range, the processor 601 specifically executes:

[0097] If the exhaust temperature is within the preset temperature range, the target duration corresponding to the preset temperature range is obtained;

[0098] The target heating rate of the gas is determined based on the temperature change value of the gas within the target time period.

[0099] Optionally, the preset temperature interval is a first temperature interval, and when the processor 601 executes if the exhaust temperature is within the preset temperature interval, obtaining the target duration corresponding to the preset temperature interval, the processor 601 specifically executes:

[0100] If the exhaust temperature is within the first temperature range, obtaining a first target duration corresponding to the first temperature range;

[0101] When the processor 601 determines the target heating rate of the gas based on the temperature change value of the gas within the target time period, it specifically executes:

[0102] Obtaining a first temperature change value of the gas within a first target time period;

[0103] The ratio of the first temperature change value to the first target time length is determined as the first target temperature increase rate of the gas.

[0104] Optionally, the preset temperature interval is the second temperature interval. When the processor 601 executes the step of obtaining the target duration corresponding to the preset temperature interval if the exhaust temperature is within the preset temperature interval, the processor 601 specifically executes:

[0105] If the exhaust temperature is within the second temperature range, a second target duration corresponding to the second temperature range is obtained, and the second target duration is less than the first target duration;

[0106] When the processor 601 determines the target heating rate of the gas based on the temperature change value of the gas within the target time period, it specifically executes:

[0107] Obtaining a second temperature change value of the gas within a second target time period;

[0108] The ratio of the second temperature change value to the second target time length is determined as the second target temperature increase rate of the gas.

[0109] Optionally, the preset temperature interval is a third temperature interval. When the processor 601 executes the step of obtaining a target duration corresponding to the preset temperature interval if the exhaust temperature is within the preset temperature interval, the processor 601 specifically executes:

[0110] If the exhaust temperature is within the third temperature range, a third target duration corresponding to the third temperature range is obtained, and the third target duration is less than the second target duration;

[0111] When the processor 601 determines the target heating rate of the gas based on the temperature change value of the gas within the target time period, it specifically executes:

[0112] Obtaining a third temperature change value of the gas within a third target time period;

[0113] The ratio of the third temperature change value to the third target time length is determined as the third target temperature rise rate of the gas.

[0114] Optionally, when the processor 601 determines the target opening of the electronic expansion valve based on the target heating rate and the current opening of the electronic expansion valve of the heat pump system, and controls the electronic expansion valve based on the target opening, the processor 601 specifically performs:

[0115] If the target heating rate is greater than the preset heating rate, the target opening coefficient is determined based on the target heating rate or the preset heating rate;

[0116] Based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, a target opening of the electronic expansion valve is determined, and the electronic expansion valve is controlled based on the target opening.

[0117] Optionally, the preset temperature interval is the first temperature interval, and when the processor 601 determines the target opening coefficient based on the target heating rate or the preset heating rate if the target heating rate is greater than the preset heating rate, the processor 601 specifically executes:

[0118] If the first target heating rate is greater than the first preset heating rate, the product of the first target heating rate or the first preset heating rate and the first preset gain factor corresponding to the first temperature range is determined as the first target opening coefficient;

[0119] When the processor 601 determines the target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controls the electronic expansion valve based on the target opening, it specifically executes:

[0120] The product of the current opening of the electronic expansion valve of the heat pump system and the first target opening coefficient is determined as the first target opening increase value of the electronic expansion valve;

[0121] The sum of the current opening and the first target opening increase value is determined as the first target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the first target opening.

[0122] Optionally, the preset temperature interval is the second temperature interval, and when the processor 601 determines the target opening coefficient based on the target heating rate or the preset heating rate if the target heating rate is greater than the preset heating rate, the processor 601 specifically executes:

[0123] If the second target heating rate is greater than the second preset heating rate, the product of the second target heating rate or the second preset heating rate and the second preset gain factor corresponding to the second temperature range is determined as the second target opening coefficient, the second preset heating rate is less than the first preset heating rate, and the second preset gain factor is greater than the first preset gain factor;

[0124] When the processor 601 determines the target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controls the electronic expansion valve based on the target opening, it specifically executes:

[0125] The product of the current opening of the electronic expansion valve of the heat pump system and the second target opening coefficient is determined as the second target opening increase value of the electronic expansion valve;

[0126] The sum of the current opening and the second target opening increase value is determined as the second target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the second target opening.

[0127] Optionally, the preset temperature interval is a third temperature interval, and when the processor 601 determines the target opening coefficient based on the target heating rate or the preset heating rate if the target heating rate is greater than the preset heating rate, the processor 601 specifically executes:

[0128] If the third target heating rate is greater than the third preset heating rate, the product of the third target heating rate or the third preset heating rate and the third preset gain factor corresponding to the third temperature range is determined as the third target opening coefficient, the third preset heating rate is less than the second preset heating rate, and the third preset gain factor is greater than the second preset gain factor;

[0129] When the processor 601 determines the target opening of the electronic expansion valve based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, and controls the electronic expansion valve based on the target opening, it specifically executes:

[0130] The product of the current opening of the electronic expansion valve of the heat pump system and the third target opening coefficient is determined as the third target opening increase value of the electronic expansion valve;

[0131] The sum of the current opening and the third target opening increase value is determined as the third target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the third target opening.

[0132] In an embodiment of the present application, the exhaust temperature of the heat pump system is obtained in real time, and a preset temperature interval is determined according to the exhaust temperature, and then the target duration corresponding to the preset temperature interval is determined, and the ratio of the temperature change value of the gas within the target duration to the target duration is determined as the target heating rate. When the target heating rate is greater than the preset heating rate, the target heating rate or the preset heating rate is multiplied by the preset gain factor as the target opening coefficient, and then the target opening increase value is determined as the product of the target opening coefficient and the current opening of the electronic expansion valve, and the target opening is the sum of the target opening increase value and the current opening. The embodiment of the present application gradually adjusts the electronic expansion valve during the rising process of the exhaust temperature, which can slow down the rate of increase of the exhaust temperature in advance, prevent the occurrence of exhaust frequency limiting or exhaust protection, and ensure the stability of the heat pump system. At the same time, different target durations, preset heating rates and preset gain factors are set for different temperature intervals, which improves the flexibility and timeliness of the control of the electronic expansion valve.

[0133] It should be understood that the device provided in the embodiment of the present application is used to execute the above-mentioned control method of an electronic expansion valve, and thus can achieve the same effect as the above-mentioned implementation method.

[0134] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to a heat pump system, the processing module may be used to control and manage the actions of the heat pump system. The storage module may be used to support the heat pump system in executing related program codes, etc.

[0135] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0136] In addition, the device provided in the embodiment of the present application can specifically be a chip, a component or a module, and the chip may include a connected processor and a memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a control method for an electronic expansion valve provided in the above embodiment.

[0137] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement a control method for an electronic expansion valve provided in the above embodiment.

[0138] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the above-mentioned related steps to implement a control method for an electronic expansion valve provided in the above embodiment.

[0139] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0140] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0141] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0142] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control method for an electronic expansion valve, characterized in that: Applied to a heat pump system, the method comprises: Obtaining the exhaust temperature of the gas discharged by the compressor of the heat pump system; If the exhaust gas temperature is within a preset temperature range, obtaining a target heating rate of the gas within a target time period corresponding to the preset temperature range; Based on the target temperature increase rate and the current opening of the electronic expansion valve of the heat pump system, a target opening of the electronic expansion valve is determined, and the electronic expansion valve is controlled based on the target opening.

2. The method according to claim 1, characterized in that If the exhaust temperature is within a preset temperature range, obtaining a target heating rate of the gas within a target time period corresponding to the preset temperature range includes: If the exhaust temperature is within a preset temperature range, obtaining a target duration corresponding to the preset temperature range; A target heating rate of the gas is determined based on a temperature change value of the gas within the target time period.

3. The method according to claim 2, characterized in that The preset temperature interval is a first temperature interval, and if the exhaust temperature is within the preset temperature interval, obtaining a target duration corresponding to the preset temperature interval includes: If the exhaust temperature is within the first temperature range, obtaining a first target duration corresponding to the first temperature range; The step of determining the target heating rate of the gas based on the temperature change value of the gas within the target time period includes: Acquire a first temperature change value of the gas within the first target time period; The ratio of the first temperature change value to the first target time length is determined as a first target heating rate of the gas.

4. The method according to claim 3, characterized in that The preset temperature interval is a second temperature interval, and if the exhaust temperature is within the preset temperature interval, obtaining a target duration corresponding to the preset temperature interval includes: If the exhaust temperature is within the second temperature range, obtaining a second target duration corresponding to the second temperature range, wherein the second target duration is less than the first target duration; The step of determining the target heating rate of the gas based on the temperature change value of the gas within the target time period includes: Acquire a second temperature change value of the gas within the second target time period; The ratio of the second temperature change value to the second target time length is determined as a second target temperature increase rate of the gas.

5. The method according to claim 4, characterized in that The preset temperature interval is a third temperature interval, and if the exhaust temperature is within the preset temperature interval, obtaining a target duration corresponding to the preset temperature interval includes: If the exhaust temperature is within the third temperature range, obtaining a third target duration corresponding to the third temperature range, wherein the third target duration is less than the second target duration; The step of determining the target heating rate of the gas based on the temperature change value of the gas within the target time period includes: Acquire a third temperature change value of the gas within the third target time period; The ratio of the third temperature change value to the third target time length is determined as a third target temperature rise rate of the gas.

6. The method according to claim 2, characterized in that The step of determining a target opening of the electronic expansion valve based on the target heating rate and a current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening includes: If the target heating rate is greater than the preset heating rate, determining a target opening coefficient based on the target heating rate or the preset heating rate; Based on the target opening coefficient and the current opening of the electronic expansion valve of the heat pump system, a target opening of the electronic expansion valve is determined, and the electronic expansion valve is controlled based on the target opening.

7. The method according to claim 6, characterized in that The preset temperature interval is a first temperature interval, and if the target heating rate is greater than the preset heating rate, determining a target opening coefficient based on the target heating rate or the preset heating rate includes: If the first target heating rate is greater than the first preset heating rate, the product of the first target heating rate or the first preset heating rate and the first preset gain factor corresponding to the first temperature range is determined as the first target opening coefficient; The step of determining a target opening of the electronic expansion valve based on the target opening coefficient and a current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening comprises: Determine the product of the current opening of the electronic expansion valve of the heat pump system and the first target opening coefficient as the first target opening increase value of the electronic expansion valve; A sum of the current opening and the first target opening increase value is determined as a first target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the first target opening.

8. The method according to claim 7, characterized in that The preset temperature interval is a second temperature interval, and if the target heating rate is greater than the preset heating rate, determining a target opening coefficient based on the target heating rate or the preset heating rate includes: If the second target heating rate is greater than the second preset heating rate, the product of the second target heating rate or the second preset heating rate and the second preset gain factor corresponding to the second temperature range is determined as the second target opening coefficient, the second preset heating rate is less than the first preset heating rate, and the second preset gain factor is greater than the first preset gain factor; The step of determining a target opening of the electronic expansion valve based on the target opening coefficient and a current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening comprises: Determine the product of the current opening of the electronic expansion valve of the heat pump system and the second target opening coefficient as the second target opening increase value of the electronic expansion valve; The sum of the current opening and the second target opening increase value is determined as a second target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the second target opening.

9. The method according to claim 8, characterized in that The preset temperature interval is a third temperature interval, and if the target heating rate is greater than the preset heating rate, determining the target opening coefficient based on the target heating rate or the preset heating rate includes: If the third target heating rate is greater than the third preset heating rate, the product of the third target heating rate or the third preset heating rate and the third preset gain factor corresponding to the third temperature range is determined as the third target opening coefficient, the third preset heating rate is less than the second preset heating rate, and the third preset gain factor is greater than the second preset gain factor; The step of determining a target opening of the electronic expansion valve based on the target opening coefficient and a current opening of the electronic expansion valve of the heat pump system, and controlling the electronic expansion valve based on the target opening comprises: Determine the product of the current opening of the electronic expansion valve of the heat pump system and the third target opening coefficient as the third target opening increase value of the electronic expansion valve; The sum of the current opening and the third target opening increase value is determined as a third target opening of the electronic expansion valve, and the electronic expansion valve is controlled based on the third target opening.

10. A control device for an electronic expansion valve, characterized in that: The device comprises: An exhaust temperature acquisition unit, used to acquire the exhaust temperature of the gas discharged by the compressor of the heat pump system; A heating rate acquisition unit, configured to acquire a target heating rate of the gas within a target time period corresponding to the preset temperature interval if the exhaust gas temperature is within the preset temperature interval; The expansion valve control unit is used to determine the target opening of the electronic expansion valve based on the target heating rate and the current opening of the electronic expansion valve of the heat pump system, and control the electronic expansion valve based on the target opening.

11. A heat pump system, characterized in that: The heat pump system comprises: A memory for storing executable program codes; A processor is used to call and run the executable program code from the memory so that the heat pump system executes the method according to any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program code, and when the computer program code is executed, the method according to any one of claims 1 to 9 is implemented.

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