Control method and apparatus for dual electronic expansion value, system, vehicle, and device

Abstract

A control method, apparatus and system for double electronic expansion valves, a vehicle, and a device. The control method comprises: determining the cooling priorities of a battery and a passenger compartment; and on the basis of the cooling priorities of the battery and the passenger compartment, controlling one of double electronic expansion valves to adopt PID closed-loop control, and controlling the other one to adopt table lookup-based open-loop control, wherein one of the double electronic expansion valves controls cooling of the battery, and the other one controls cooling of the passenger compartment. According to the present application, control modes of the electronic expansion valves are determined on the basis of the cooling priorities of the battery and the passenger compartment, enabling one of the electronic expansion valves to adopt PID closed-loop control, and the other one to adopt table lookup-based open-loop control. Therefore, in a control system for double electronic expansion valves, the two electronic expansion valves will not simultaneously adopt PID closed-loop control, thus not affecting each other, and the control logic of the electronic expansion valves is not associated with the control logic of a compressor, thereby avoiding system oscillation during dual cooling.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to Chinese Patent Application No. 202510029539.8, filed to the China National Intellectual Property Administration (CNIPA) on January 8, 2025, and entitled “CONTROL METHOD AND APPARATUS FOR DUAL ELECTRONIC EXPANSION VALUE, SYSTEM, VEHICLE, AND DEVICE”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD The present application relates to the technical field of thermal management systems of new energy vehicles, and in particular relates to a control method and apparatus for a dual electronic expansion valve, a system, a vehicle, and a device. BACKGROUND At present, new energy vehicles have outstanding advantages in a field of improving energy utilization efficiency and reducing carbon emissions. In the consumer market, a market penetration rate of new energy vehicles is increasing year by year. A thermal management system is a key subsystem of new energy vehicles, which is used to maintain temperature of a passenger compartment on one hand, and is used for cooling of a battery pack on the other hand. New energy vehicles mainly use a battery pack as an energy source thereof, and one of the core safety issues faced by new energy vehicles is thermal runaway of the battery pack due to over-heat of battery cells. Therefore, the thermal management systems of new energy vehicles must be designed in accordance with a temperature control apparatus and method for the battery pack, especially, a cooling system, apparatus and method for the battery pack not only belong to key and core technologies of thermal management systems of new energy vehicles, but also are hot spots of the research and development of new energy vehicle technology carried out by various car manufacturers. At present, in the industry, thermal expansion valves are generally used in traditional vehicles to build the thermal management system thereof, electronic expansion valves combined with thermal expansion valves are used in new energy vehicles; but in the thermal management system of high-end vehicle models or vehicle models that pursue the ultimate experience, and especially in pure electric new energy vehicles, using dual electronic expansion valves and using thermal expansion valves both account for a certain percentage. The electronic expansion valve in the refrigeration system of new energy vehicles has a higher control precision than the thermal expansion valve, and can effectively distribute the cooling capacity, so the electronic expansion valve is gradually replacing the thermal expansion valve in the industry, for example, a dual electronic expansion valve may be used. In related art, a dual refrigeration system for an air conditioning unit and a battery uses a dual electronic expansion valve, that is, having an electronic expansion valve member for the battery and an electronic expansion valve member for the air conditioning unit, the control method thereof is mainly as follows: the electronic expansion valve member for the battery and the electronic expansion valve member for the air conditioning unit both perform PID (proportional-integral-derivative) regulation based on a superheat degree, and the control of the electronic expansion valve members are linked to that of the compressor. When performing double cooling, the valve members of the dual electronic expansion valve operate at the same time, and system oscillation may occur and cannot be controlled. Therefore, it is necessary to design a new control method of a dual electronic expansion valve to overcome the above problem. SUMMARY OF THE INVENTION The present application provides a control method and apparatus for a dual electronic expansion valve, a system, a vehicle, and a device, which can solve the problem in the related art that, when the valve members of a dual electronic expansion valve operate at the same time, system oscillation may occur and cannot be controlled. With regard to a first aspect, the embodiments of the present application provide a control method for a dual electronic expansion valve, and the control method comprises steps of: determining refrigeration priorities of a battery and a passenger compartment; and controlling one electronic expansion valve member of the dual electronic expansion valve to use a closed-loop control in a manner of PID and controlling the other electronic expansion valve member thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment, wherein one electronic expansion valve member of the dual electronic expansion valve controls cooling of the battery and the other electronic expansion valve member thereof controls cooling of the passenger compartment. In combination with the first aspect, in an embodiment, the step of controlling one electronic expansion valve member of the dual electronic expansion valve to use a closed-loop control in a manner of PID and controlling the other electronic expansion valve member thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment comprises: controlling an electronic expansion valve member that corresponds to the one with a higher refrigeration priority selected from the battery and the passenger compartment to use the closed-loop control in a manner of PID; and controlling an electronic expansion valve member that corresponds to the one with a lower refrigeration priority selected from the battery and the passenger compartment to use the open-loop control in a manner of look-up table. In combination with the first aspect, in an embodiment, if the refrigeration priority of the battery is higher than that of the passenger compartment, an electronic expansion valve member that corresponds to the battery is controlled to use the closed-loop control in a manner of PID according to a difference between a target superheat degree and an actual superheat degree at an outlet of an evaporator that corresponds to the battery; and an opening-degree value of an electronic expansion valve member that corresponds to the passenger compartment is determined in a manner of look-up table based on a difference between a battery actual inflow water temperature and a battery target inflow water temperature and the electronic expansion valve member that corresponds to the passenger compartment is controlled to be adjusted to the determined opening-degree value. In combination with the first aspect, in an embodiment, if the refrigeration priority of the passenger compartment is higher than that of the battery, an electronic expansion valve member that corresponds to the passenger compartment is controlled to use the closed-loop control in a manner of PID according to a difference between a target superheat degree and an actual superheat degree at an outlet of an evaporator that corresponds to the passenger compartment; and an opening-degree value of an electronic expansion valve member that corresponds to the battery is determined in a manner of look-up table based on a difference between a battery actual inflow water temperature and a corrected battery target inflow water temperature and the electronic expansion valve member that corresponds to the battery is controlled to be adjusted to the determined opening-degree value. In combination with the first aspect, in an embodiment, the battery target inflow water temperature is corrected according to a difference between an actual air duct outlet air temperature and a target air duct outlet air temperature of the passenger compartment. In combination with the first aspect, in an embodiment, the step of determining refrigeration priorities of the battery and the passenger compartment comprises: determining whether a temperature of the battery reaches an upper boundary of normal operating temperature or whether the passenger compartment has sufficient refrigeration capacity; and if the temperature of the battery reaches the upper boundary of normal operating temperature and / or the passenger compartment has sufficient refrigeration capacity, setting the refrigeration priority of the battery to be higher than that of the passenger compartment; otherwise, setting the refrigeration priority of the passenger compartment to be higher than that of the battery. With regard to a second aspect, the embodiments of the present application provide a control apparatus for a dual electronic expansion valve, and the control apparatus comprises: a priority determination module, configured to determine refrigeration priorities of a battery and a passenger compartment; and a control module, configured to control one electronic expansion valve member of the dual electronic expansion valve to use a closed-loop control in a manner of PID and control the other electronic expansion valve member thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment, wherein one electronic expansion valve member of the dual electronic expansion valve controls cooling of the battery and the other electronic expansion valve member thereof controls cooling of the passenger compartment. With regard to a third aspect, the embodiments of the present application provide a control system for a dual electronic expansion valve, and the control system comprises: a battery heat exchanger, with a side thereof connected to a battery cooling circuit and with the other side thereof connected to a refrigerant circuit, wherein the dual electronic expansion valve is provided on the refrigerant circuit; and the above-mentioned control apparatus, wherein the control module of the control apparatus is connected to the dual electronic expansion valve, and the control module is configured to control the opening-degree of the dual electronic expansion valve. With regard to a fourth aspect, the embodiments of the present application provide a vehicle that is equipped with the above-mentioned control system. With regard to a fifth aspect, the embodiments of the present application provide a control device for a dual electronic expansion valve, wherein the control device for a dual electronic expansion valve comprises a processor, a memory, and a control program for dual electronic expansion valve that is stored in the memory and executable by the processor, wherein the control program for dual electronic expansion valve, when executed by the processor, implements the steps of the above-mentioned control method. The beneficial effects brought by the technical solutions provided by the embodiments of the present application include: By using refrigeration priorities of a battery and a passenger compartment, control manners of electronic expansion valve members are determined, so as to control one electronic expansion valve member thereof to use a closed-loop control in a manner of PID and control the other electronic expansion valve member thereof to use an open-loop control in a manner of look-up table. In a corresponding control system for the dual electronic expansion valve, the two electronic expansion valve members will not be simultaneously subject to the closed-loop control in a manner of PID, and have no influence on each other. Moreover, the control of the two electronic expansion valve members is not related to the compressor in its control logic, which prevents the system oscillation when performing double cooling, and solves the problem in the related art that, when the valve members of a dual electronic expansion valve operate at the same time, system oscillation may occur and cannot be controlled. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of an embodiment of a control method of a dual electronic expansion valve of the present application; FIG. 2 is a flow chart of another embodiment of a control method of a dual electronic expansion valve of the present application; FIG. 3 is an architectural schematic diagram of an embodiment of a control system of a dual electronic expansion valve of the present application; and FIG. 4 is a schematic diagram of a hardware structure of a control device of the dual electronic expansion valve involved in the solutions of the embodiments of the present application. In the figures: 1, a battery heat exchanger; 2, a battery cooling circuit; 21, a battery pack; 22, a water pump; 3, a refrigerant circuit; 31, an electronic expansion valve; 32, a condenser; 33, an evaporator; 34, a cooling fan; 35, an electric compressor; 36, a temperature and pressure sensor. DETAILED DESCRIPTION In order to enable a person skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Apparently, the described embodiments are only a part of the embodiments of the present application, not all of them. Based on the embodiments described in the present application, all other embodiments obtainable by a person with ordinary skill in the art without making creative labor fall within the protection scope of the present application. In the related art, valve members of a dual electronic expansion valve in a thermal management and dual refrigeration system are controlled simultaneously using a superheat degree, this may cause system oscillation, i.e., a temperature of the passenger compartment and a temperature of the battery during the initial starting period may cause the system oscillation, thereby adversely affecting the comfort of the user. Embodiments of the present application provide a control method and apparatus for a dual electronic expansion valve, a system, a vehicle, and a device, which can solve the problem in the related art that, when the valve members of a dual electronic expansion valve operate at the same time, system oscillation may occur and cannot be controlled. In order to make purposes, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the drawings. In a first aspect, the embodiments of the present application provide a control method for a dual electronic expansion valve. In one embodiment, referring to FIG. 1, FIG. 1 is a flow chart of an embodiment of a control method of a dual electronic expansion valve of the present application. As shown in FIG. 1, the control method of a dual electronic expansion valve comprises steps of: S1: determining refrigeration priorities of a battery and a passenger compartment. In the step S1, after determining a refrigeration priority of a battery and a refrigeration priority of a passenger compartment, it can be judged whether the refrigeration priority of the battery is higher than that of the passenger compartment or the refrigeration priority of the passenger compartment is higher than that of the battery. Subsequently, it will be judged based on the priority levels which electronic expansion valve member 31 is subject to the closed-loop control in a manner of PID and which electronic expansion valve member 31 is subject to the open-loop control in a manner of look-up table. S2: controlling one electronic expansion valve member 31 of the dual electronic expansion valve 31 to use a closed-loop control in a manner of PID and controlling the other electronic expansion valve member 31 thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment, wherein one electronic expansion valve member 31 of the dual electronic expansion valve 31 controls cooling of the battery and the other electronic expansion valve member 31 thereof controls cooling of the passenger compartment. In the present embodiment, the control method is applicable in a thermal management control system using two electronic expansion valve members 31, wherein one electronic expansion valve member 31 is used to control cooling of the battery and the other electronic expansion valve member 31 is used to control cooling of the passenger compartment. After determining levels of refrigeration priorities of the battery and the passenger compartment, it can be judged based on the levels of the refrigeration priorities which electronic expansion valve member 31 is subject to the closed-loop control in a manner of PID, with the other electronic expansion valve member 31 being subject to the open-loop control in a manner of look-up table. In a corresponding control system for the dual electronic expansion valve, by controlling the two electronic expansion valve members 31 not to simultaneously use the closed-loop control in a manner of PID, the two electronic expansion valve members 31 would have no influence on each other. Moreover, in the control method for the two electronic expansion valve members 31, parameters related to the compressor is not used, and the control method is not related to the compressor in its control logic, which prevents the system oscillation when performing dual cooling, and solves the problem in the related art that, when the valve members of a dual electronic expansion valve 31 operate at the same time, system oscillation may occur and cannot be controlled. Optionally, in an embodiment, the step of controlling one electronic expansion valve member 31 of the dual electronic expansion valve 31 to use a closed-loop control in a manner of PID and controlling the other electronic expansion valve member 31 thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment comprises: controlling an electronic expansion valve member 31 that corresponds to the one with a higher refrigeration priority selected from the battery and the passenger compartment to use the closed-loop control in a manner of PID; and controlling an electronic expansion valve member 31 that corresponds to the one with a lower refrigeration priority selected from the battery and the passenger compartment to use the open-loop control in a manner of look-up table. In this embodiment, by comparing the refrigeration priority of the battery and the refrigeration priority of the passenger compartment, it can be judged whether the refrigeration priority of the battery is higher or the refrigeration priority of the passenger compartment is higher. The electronic expansion valve member 31 with a higher refrigeration priority is subject to the closed-loop control in a manner of PID, which is able to ensure a proper superheat degree and thus ensure a sufficient refrigeration capacity, and the electronic expansion valve member 31 with a lower refrigeration priority is subject to the open-loop control in a manner of look-up table. Of course, in other embodiments, it is also possible to set the electronic expansion valve member with a higher refrigeration priority to use the open-loop control in a manner of look-up table and set the electronic expansion valve member with a lower refrigeration priority to use the closed-loop control in a manner of PID, according to actual demands. On the basis of the above-mentioned technical solution, in some optional embodiments, if the refrigeration priority of the battery is higher than that of the passenger compartment, an electronic expansion valve member 31 that corresponds to the battery is controlled to use the closed-loop control in a manner of PID according to a difference between a target superheat degree and an actual superheat degree at an outlet of an evaporator 33 that corresponds to the battery; and an opening-degree value of an electronic expansion valve member 31 that corresponds to the passenger compartment is determined in a manner of look-up table based on a difference between a battery actual inflow water temperature and a battery target inflow water temperature, and the electronic expansion valve member 31 that corresponds to the passenger compartment is controlled to be adjusted to the determined opening-degree value. In the present embodiment, the target superheat degree at the outlet of the evaporator 33 that corresponds to the battery may be set to be 5 degrees, for example. Opening-degree values of the electronic expansion valve member 31 corresponding to values of difference between the battery actual inflow water temperature and the battery target inflow water temperature are shown in Table 1 below. After calculating the value of difference temp1 between the battery actual inflow water temperature and the battery target inflow water temperature, the corresponding opening-degree value can be looked up directly from Table 1, and then the corresponding electronic expansion valve member 31 can be controlled to be adjusted to the determined opening degree. 5        Table 1     A correspondence table between temp1 and the opening-degree value of the electronic expansion valve member of the passenger compartment (battery actual inflow water temperature minus battery target inflow water temperature) tempi (°C) opening-degree value of the electronic   expansion   valve member (step count) 0 460 1 440 2 420 3 300 4 380 5 360 6 340 7 320 8 300 9 280 10 260 ...... ...... Optionally, in one embodiment, if the refrigeration priority of the passenger compartment is higher than that of the battery, an electronic expansion valve member 31 that corresponds to 10 the passenger compartment is controlled to use the closed-loop control in a manner of PID according to a difference between a target superheat degree and an actual superheat degree at an outlet of an evaporator 33 that corresponds to the passenger compartment; and an opening-degree value of an electronic expansion valve member 31 that corresponds to the battery is determined in a manner of look-up table based on a difference between a battery 15 actual inflow water temperature and a corrected battery target inflow water temperature, and the electronic expansion valve member 31 that corresponds to the battery is controlled to be adjusted to the determined opening-degree value. In the present embodiment, if the refrigeration priority of the passenger compartment is higher, the electronic expansion valve member 31 for controlling the cooling of the passenger compartment is regulated in a manner of PID, the target superheat degree at the outlet of the evaporator 33 that corresponds to the passenger compartment is set to be X degrees (e.g., X=5), and the opening-degree value of the electronic expansion valve member 31 for controlling the cooling of the passenger compartment is determined based on the difference between the target superheat degree at the outlet of the evaporator 33 that corresponds to the passenger compartment and the actual superheat degree at the outlet of the evaporator 33 that corresponds to the passenger compartment, which is subject to closed-loop control. For the battery with a relatively lower refrigeration priority, since the flow rate distribution of the air conditioning unit would affect the electronic expansion valve member 31 that corresponds to the battery, it is required to make real-time correction to the battery target inflow water temperature. And an opening-degree value of the electronic expansion valve member 31 that corresponds to the battery is determined in a manner of look-up table 2 based on a difference, temp2, between the battery actual inflow water temperature and the corrected battery target inflow water temperature, and the electronic expansion valve member 31 that corresponds to the battery is controlled to be adjusted to the determined opening-degree value. Wherein, Table 1 and Table 2 can be obtained by calibration according to the actual project. Table 2 A correspondence table between temp2 and the opening-degree value of the electronic expansion valve member of the battery (battery actual inflow water temperature minus corrected   battery   target   inflow   water temperature) temp2 (°C) opening-degree value of the electronic  expansion  valve member (step count) 0 60 2.5 120 5 210 7.5 350 10 420 12.5 500 15 570 17.5 570 20 570 22.5 570 25 570 ...... ...... On the basis of the above technical solution, in an embodiment, when obtaining the corrected battery target inflow water temperature, the battery target inflow water temperature is corrected according to a difference between an actual air duct outlet air temperature and a 5 target air duct outlet air temperature of the passenger compartment. In the present embodiment, the actual air duct outlet air temperature and the target air duct outlet air temperature of the passenger compartment may be obtained first, the difference between them, temp3, may be calculated, and then the corresponding corrected battery target inflow water temperature may be looked up from the following Table 3 (a correspondence table between 10 temp3 and the battery target inflow water temperature). Wherein, Table 3 can also be obtained by calibration according to the actual project. Table 3 A correspondence table between temp3 and the battery target inflow water temperature temperature difference (actual air duct outlet air temperature minus target air duct outlet air temperature) temp3 (°C) battery   target   inflow   water temperature (C) >12 34 8 26 ■   6 actual value of battery target inflow water temperature 15 Optionally, in some optional embodiments, the step of determining refrigeration priorities of the battery and the passenger compartment may comprise: S11: determining whether a temperature of the battery reaches an upper boundary of normal operating temperature or whether the passenger compartment has sufficient refrigeration capacity; and S12: if the temperature of the battery reaches the upper boundary of normal operating temperature and / or the passenger compartment has sufficient refrigeration capacity, setting the refrigeration priority of the battery to be higher than that of the passenger compartment; otherwise, setting the refrigeration priority of the passenger compartment to be higher than that of the battery. Referring to FIG. 2, in the present embodiment, the temperature of the battery cell and the target air duct outlet air temperature of the passenger compartment can be monitored in real time. If the temperature of the battery cell (T)>T1 or the target air duct outlet air temperature of the passenger compartment (t)>t1, which means that the three cases ofT>T1 and t>t1, T>T1 and t<t1, and T<T1 and t>t1 are included, the refrigeration priority of the battery is set to be higher than the refrigeration priority of the passenger compartment. Wherein, T1: this T1 is a battery cell maximum temperature at the upper boundary for safe operation of the battery, and this value is related to the material of the battery cell, NTC (negative temperature coefficient thermistor) arrangement position, and battery capacity, so different models of battery packs 21 have different values of T1, which is provided by the battery manufacturer (e.g., 50°C). t1: this t1 is related to the refrigeration capacity of the thermal management system, ambient temperature, and battery charge / discharge rate. A vehicle model with a constant system refrigeration capacity has a constant impact on t1; the higher the ambient temperature, the larger t1; the larger the battery charge / discharge rate, the larger t1. t1=k1*tambient*k2*I*tbase; wherein k1 is an influence coefficient of the ambient temperature on t1; tambient is the ambient temperature; k2 is an influence coefficient of charge / discharge rate on t1; I is a discharge rate; tbase is a base temperature (e.g., 9°C). If the temperature of the battery cell (T)<T2 and the target air duct outlet air temperature of the passenger compartment (t)<t2, that is, the one case of T<T2 and t<t2 is included, then the refrigeration priority of the passenger compartment is set be higher than that of the battery. Wherein, T2: this T2 is a battery cell maximum temperature at which the battery exits the upper boundary for safe operation, T2=T1-8°C (provided by the battery manufacturer). t2: this t2 is a minimum temperature which satisfies the cooling requirement of the passenger compartment, t2 = t1-5°C (calibration value). In a process while the battery cell temperature is rising: If T2<T<T1 and t2<t<t1, the refrigeration priority of the passenger compartment is set to be higher than that of the battery. If T2<T<T1 and t<t2, the refrigeration priority of the passenger compartment is set to be higher than that of the battery. If T<T2 and t2<t<t1, the refrigeration priority of the passenger compartment is set to be higher than that of the battery. In a process while the battery cell temperature is decreasing: If T2<T<T1 and t2<t<t1, the refrigeration priority of the battery is set to be higher than that of the passenger compartment. If T2<T<T1 and t<t2, the refrigeration priority of the battery is set to be higher than that of the passenger compartment. If T<T2 and t2<t<t1, the refrigeration priority of the battery is set to be higher than that of the passenger compartment. In the present embodiment, since the temperature sensitivity required by the battery is not as high as that required by the passenger, but the safety required by the battery is higher than that required by the passenger, a general principle for setting the refrigeration priorities of the battery and the passenger compartment is to give priority to the battery when the temperature of the battery reaches the upper boundary of normal operating temperature and / or the passenger compartment has sufficient refrigeration capacity; and to give priority to the passenger compartment when the temperature of the battery is lower than the upper boundary of normal operating temperature and the passenger compartment does not have sufficient refrigeration capacity. When the battery is given priority, the system is set to meet the cooling demand of the battery, and the electronic expansion valve member 31 corresponding to the battery is subject to the closed-loop control according to superheat degree; the remaining cooling capacity of the system is allocated to the passenger compartment, and the electronic expansion valve member 31 corresponding to the passenger compartment is subject to the open-loop control in a manner of look-up table. When the passenger compartment is given priority, the system is set to meet the cooling demand of the passenger compartment, the electronic expansion valve member 31 corresponding to the passenger compartment is subject to the closed-loop control according to superheat degree; the remaining cooling capacity of the system is allocated to the battery, and the electronic expansion valve member 31 corresponding to the battery is subject to the open-loop control in a manner of look-up table. The control method provides cooperative control for the dual electronic expansion valves 31, wherein the refrigeration priorities of the battery and the passenger compartment are determined first, and the electronic expansion valve member 31 with a higher refrigeration priority is set to use the PID control, the electronic expansion valve member 31 with a lower refrigeration priority is set to use the look-up table control, and the control of the two electronic expansion valve members 31 is not related to the compressor in its control logic, which prevents system oscillation when performing dual cooling, and reduces the difficulty level of software implementation and calibration. The thermal management system in the related art, which adopts an electronic expansion valve member 31 for cooling of the passenger compartment and adopts another electronic expansion valve member 31 for cooling of the battery, has poor stability and would have system oscillation occurring when performing control by using a dual electronic expansion valve. The present control method can prevent system oscillation, effectively distribute the cooling capacity, and satisfy cooling needs of both the battery and the passenger compartment. In a second aspect, the embodiments of the present application further provide a control apparatus for a dual electronic expansion valve, the control apparatus may comprise: a priority determination module, configured to determine refrigeration priorities of a battery and a passenger compartment; and a control module, configured to control one electronic expansion valve member 31 of the dual electronic expansion valve 31 to use a closed-loop control in a manner of PID and control the other electronic expansion valve member 31 thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment, wherein one electronic expansion valve member 31 of the dual electronic expansion valve 31 controls cooling of the battery and the other electronic expansion valve member 31 thereof controls cooling of the passenger compartment. Wherein, the functional realization of each module in the above-described control apparatus for a dual electronic expansion valve corresponds to each step in the above-described embodiment of the control method for a dual electronic expansion valve, and the functions and realization process thereof will not be repeated herein. In a third aspect, the embodiments of the present application also provide a control system for a dual electronic expansion valve, which may comprise: a battery heat exchanger 1, with a side thereof connected to a battery cooling circuit 2 and with the other side thereof connected to a refrigerant circuit 3, wherein the dual electronic expansion valve 31 is provided on the refrigerant circuit 3; and the above-mentioned control apparatus, wherein the control module of the control apparatus is connected to the dual electronic expansion valve 31, and the control module is configured to control the opening-degree of the dual electronic expansion valve 31. Referring to FIG. 3, in the present embodiment, the refrigerant circuit 3 is further provided with a condenser 32 and an evaporator 33, a liquid reservoir is provided at an end of the condenser 32, and a cooling fan 34 is provided at one side of the condenser 32, and an electric compressor 35 is provided between the condenser 32 and the battery heat exchanger 1, and a temperature and pressure sensor 36 is provided between the electric compressor 35 and the battery heat exchanger 1, and a temperature and pressure sensor 36 is also provided between the evaporator 33 and the battery heat exchanger 1. The battery cooling circuit 2 is provided with a battery pack 21 and a water pump 22. Wherein one side of the battery heat exchanger 1 is for the refrigerant to flow through, and the other side thereof is for the coolant, and the water pump 22 drives the coolant to flow into the interior of the battery pack 21, and a temperature sensor is provided at the inlet of the battery pack 21, and then the heat is transferred from the interior of the battery pack 21 to the refrigerant in the battery heat exchanger 1. The heat from the battery is removed by evaporation of the refrigerant. In a fourth aspect, the embodiments of the present application further provide a vehicle, and the vehicle is equipped with the above-mentioned control system. In a fifth aspect, the embodiments of the present application provide a control device for a dual electronic expansion valve, the control device for a dual electronic expansion valve may be a device having data processing functions, such as a personal computer (PC), a laptop, a server, or the like. Referring to FIG. 4, FIG. 4 is a schematic diagram of a hardware structure of a control device of the dual electronic expansion valve involved in the solutions of the embodiments of the present application. In an embodiment of the present application, the control device for a dual electronic expansion valve may include a processor, a memory, a communication interface, and a communication bus. Wherein, the communication bus may be of any type for interconnecting the processor, the memory, and the communication interface. The communication interface includes interfaces for interconnecting components within the control device for a dual electronic expansion valve as well as for interconnecting the control device for a dual electronic expansion valve with other devices (e.g., other computing devices or user devices), such as an input / output (I / O) interface, a physical interface, and a logical interface. The physical interface may be an Ethernet interface, a fiber-optic interface, an ATM interface, etc.; the user device may be a display, a keyboard, etc. The memory may be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical memory, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), and so on. The processor may be a general-purpose processor, and the general-purpose processor may call the control program for dual electronic expansion valve stored in the memory to execute the control method provided by the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). Wherein, the method executed when the control program for dual electronic expansion valve is invoked may refer to various embodiments of the control method for the dual electronic expansion valve of the present application, and will not be repeated herein. It will be understood by a person skilled in the art that the hardware structure shown in FIG. 4 does not constitute a limitation to the present application, and it may include more or fewer components than shown, or a combination of certain components, or a different arrangement of components. It should be noted that the above numbering of the embodiments of the present application are for descriptive purposes only and do not represent the merits of the embodiments. The terms “comprising” and “including” and any variations thereof in the specification, claims and the above drawings of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally may also include steps or units that are not listed, or optionally includes other steps or units that are inherent to the process, method, product or apparatus. The terms, such as “first”, “second”, and “third”, are used to distinguish different objects, etc., and do not represent an order of precedence, and the “first”, “second” and “third” objects are not thereby defined to be different types. In the description of the embodiments of the present application, “exemplary”, “for example”, or “take ... as an example” or the like are used to indicate an example, illustration, or description. Any embodiment or design solution described as “exemplary”, “for example”, or “take . as an example” in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. Rather, the use of the terms “exemplary”, “for example”, or “take . as an example” is intended to present the relevant concepts in a specific manner. In the description of embodiments of the present application, unless otherwise indicated, “ / ” means or, e.g., A / B may mean either A or B; “and / or” in the present application is merely a way of describing an association relationship of the associated objects, indicating that there may be three types of relationships, e.g., A and / or B, which can mean: A alone, both A and B, and B alone; furthermore, in the description of the embodiments of the present application, “a plurality of” refers to two or more than two. In some of the processes described in the embodiments of the present application, a plurality of operations or steps are included in a particular sequence of occurrence, but it should be understood that these operations or steps may not be performed in the sequence that appears in the embodiments of the present application, and may be performed in parallel, and that the numbering of the operations are only used to distinguish different operations, and that the numbering itself does not represent any order of execution. Furthermore, the processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined with one another. By the description of the above embodiments, it is clear to a person skilled in the art that the methods of the above embodiments may be implemented by means of software plus the necessary general-purpose hardware platform, or of course by means of hardware, but in many cases the former is the preferred embodiment. Based on this understanding, the essence of the technical solution of the present application or the part thereof that makes a contribution to the prior art may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions to enable a terminal device to perform the methods described in the various embodiments of the present application. The above are only preferred embodiments of the present application, and are not intended to limit the patent protection scope of the present application, and any equivalent structure or equivalent process variations made by using the contents of the specification and the drawings of the present application, or by directly or indirectly applying them in other related technical fields, are all likewise included in the patent protection scope of the present application.

Claims

1. A control method for a dual electronic expansion valve, characterized in that the control method comprises steps of:determining refrigeration priorities of a battery and a passenger compartment; andcontrolling one electronic expansion valve member of the dual electronic expansion valve to use a closed-loop control in a manner of PID and controlling the other electronic expansion valve member thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment, wherein one electronic expansion valve member of the dual electronic expansion valve controls cooling of the battery and the other electronic expansion valve member thereof controls cooling of the passenger compartment.

2. The control method for a dual electronic expansion valve according to claim 1, characterized in that, the step of controlling one electronic expansion valve member of the dual electronic expansion valve to use a closed-loop control in a manner of PID and controlling the other electronic expansion valve member thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment comprises:controlling an electronic expansion valve member that corresponds to the one with a higher refrigeration priority selected from the battery and the passenger compartment to use the closed-loop control in a manner of PID; and controlling an electronic expansion valve member that corresponds to the one with a lower refrigeration priority selected from the battery and the passenger compartment to use the open-loop control in a manner of look-up table.

3. The control method for a dual electronic expansion valve according to claim 2, characterized by,if the refrigeration priority of the battery is higher than that of the passenger compartment, controlling an electronic expansion valve member that corresponds to the battery to use the closed-loop control in a manner of PID according to a difference between a target superheatdegree and an actual superheat degree at an outlet of an evaporator that corresponds to the battery; anddetermining an opening-degree value of an electronic expansion valve member that corresponds to the passenger compartment in a manner of look-up table based on a difference between a battery actual inflow water temperature and a battery target inflow water temperature and controlling the electronic expansion valve member that corresponds to the passenger compartment to be adjusted to the determined opening-degree value.

4. The control method for a dual electronic expansion valve according to claim 2, characterized in that,if the refrigeration priority of the passenger compartment is higher than that of the battery, controlling an electronic expansion valve member that corresponds to the passenger compartment to use the closed-loop control in a manner of PID according to a difference between a target superheat degree and an actual superheat degree at an outlet of an evaporator that corresponds to the passenger compartment; anddetermining an opening-degree value of an electronic expansion valve member that corresponds to the battery in a manner of look-up table based on a difference between a battery actual inflow water temperature and a corrected battery target inflow water temperature and controlling the electronic expansion valve member that corresponds to the battery to be adjusted to the determined opening-degree value.

5. The control method for a dual electronic expansion valve according to claim 4, characterized in that,correcting the battery target inflow water temperature according to a difference between an actual air duct outlet air temperature and a target air duct outlet air temperature of the passenger compartment.

6. The control method for a dual electronic expansion valve according to claim 1, characterized in that, the step of determining refrigeration priorities of the battery and the passenger compartment comprises:determining whether a temperature of the battery reaches an upper boundary of normal operating temperature or whether the passenger compartment has sufficient refrigeration capacity; andif the temperature of the battery reaches the upper boundary of normal operating temperature and / or the passenger compartment has sufficient refrigeration capacity, setting the refrigeration priority of the battery to be higher than that of the passenger compartment; otherwise, setting the refrigeration priority of the passenger compartment to be higher than that of the battery.

7. A control apparatus for a dual electronic expansion valve, characterized in that the control apparatus comprises:a priority determination module, configured to determine refrigeration priorities of a battery and a passenger compartment; anda control module, configured to control one electronic expansion valve member of the dual electronic expansion valve to use a closed-loop control in a manner of PID and control the other electronic expansion valve member thereof to use an open-loop control in a manner of look-up table based on the refrigeration priorities of the battery and the passenger compartment, wherein one electronic expansion valve member of the dual electronic expansion valve controls cooling of the battery and the other electronic expansion valve member thereof controls cooling of the passenger compartment.

8. A control system for a dual electronic expansion valve, characterized in that the control system comprises:a battery heat exchanger (1), with a side thereof connected to a battery cooling circuit (2) and with the other side thereof connected to a refrigerant circuit (3), wherein the dual electronic expansion valve (31) is provided on the refrigerant circuit (3); andthe control apparatus according to claim 7, wherein the control module of the control apparatus is connected to the dual electronic expansion valve (31), and the control module is configured to control the opening-degree of the dual electronic expansion valve (31).

9. A vehicle, characterized in that the vehicle is equipped with the control system according to claim 8.

10. A control device for a dual electronic expansion valve, characterized in that the control device for a dual electronic expansion valve comprises a processor, a memory, and a control program for dual electronic expansion valve that is stored in the memory and executable by the processor, wherein the control program for dual electronic expansion valve, when executed by the processor, implements the steps of the control method according to any one of claims 1 to 6.

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