Control method, apparatus and system for double electronic expansion valves, 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

Control methods, devices, systems, vehicles and equipment for dual electronic expansion valves

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510029539.8, filed on January 8, 2025, entitled "Control Method, Apparatus, System, Vehicle and Equipment for Dual Electronic Expansion Valves", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of thermal management systems for new energy vehicles, specifically to a control method, device, system, vehicle, and equipment for dual electronic expansion valves. Background Technology

[0004] Currently, new energy vehicles have significant advantages in improving energy efficiency and reducing carbon emissions. In the consumer market, the market penetration rate of new energy vehicles is increasing year by year.

[0005] The thermal management system is a key subsystem of new energy vehicles, serving two purposes: maintaining the temperature of the passenger compartment and cooling the battery pack. New energy vehicles primarily use battery packs as their energy source, and thermal runaway of the battery pack due to cell overheating is currently one of the core safety issues facing these vehicles. Therefore, the thermal management system for new energy vehicles must be designed specifically for temperature control devices and methods for the battery pack. In particular, the cooling system devices and methods for the battery pack are key and core technologies of the thermal management system for new energy vehicles, and a hot topic for various automakers in their new energy vehicle technology development.

[0006] Currently, in the industry, traditional vehicles generally use thermostatic expansion valves to construct vehicle thermal management systems, while new energy vehicles use a combination of electronic expansion valves and thermostatic expansion valves. However, high-end models or those pursuing the ultimate experience, especially pure electric new energy vehicles, use a significant proportion of thermal management systems employing both dual electronic expansion valves and thermostatic expansion valves. In the refrigeration systems of new energy vehicles, electronic expansion valves offer higher control precision than thermostatic expansion valves and can more effectively distribute cooling capacity. Therefore, electronic expansion valves are gradually replacing thermostatic expansion valves in the industry, for example, through the use of dual electronic expansion valves.

[0007] In related technologies, a dual-cooling system combining air conditioning and battery uses dual electronic expansion valves, namely a battery electronic expansion valve and an air conditioning electronic expansion valve. The control method is mainly as follows: both the battery electronic expansion valve and the air conditioning electronic expansion valve are PID (proportional-integral-derivative) regulated based on superheat. The control of the electronic expansion valves is linked to the compressor. When dual cooling is used, the two electronic expansion valves work simultaneously, and the system will oscillate and become uncontrollable.

[0008] Therefore, it is necessary to design a new control method for dual electronic expansion valves to overcome the above problems. Summary of the Invention

[0009] This application provides a control method, device, system, vehicle, and equipment for dual electronic expansion valves, which can solve the technical problem in related technologies where the system oscillates and cannot be controlled when dual electronic expansion valves work simultaneously.

[0010] In a first aspect, embodiments of this application provide a control method for a dual electronic expansion valve, the control method comprising the following steps:

[0011] Determine the cooling priority for the battery and the crew compartment;

[0012] Based on the cooling priorities of the battery and the passenger compartment, one of the dual electronic expansion valves is controlled by PID closed-loop control, while the other electronic expansion valve is controlled by open-loop control using a lookup table method. Specifically, one of the dual electronic expansion valves controls battery cooling, while the other electronic expansion valve controls passenger compartment cooling.

[0013] In conjunction with the first aspect, in one implementation, the control of one of the dual electronic expansion valves based on the cooling priority of the battery and the passenger compartment using PID closed-loop control, and the control of the other electronic expansion valve using open-loop control via a lookup table method, includes:

[0014] For batteries and passenger compartments with high cooling priority, the corresponding electronic expansion valves are controlled using PID closed-loop control; for batteries and passenger compartments with low cooling priority, the corresponding electronic expansion valves are controlled using open-loop control with a lookup table.

[0015] In conjunction with the first aspect, in one embodiment, if the cooling priority of the battery is higher than that of the passenger compartment, the electronic expansion valve corresponding to the battery is controlled by PID closed-loop control based on the difference between the target superheat and the actual superheat at the outlet of the battery-side evaporator; and the opening value of the electronic expansion valve corresponding to the passenger compartment is determined by looking up a table based on the difference between the actual water temperature and the target water temperature of the battery, and the electronic expansion valve corresponding to the passenger compartment is controlled to be adjusted to the opening value.

[0016] In conjunction with the first aspect, in one embodiment, if the cooling priority of the passenger compartment is higher than that of the battery, then the electronic expansion valve corresponding to the passenger compartment is controlled by PID closed-loop control based on the difference between the target superheat and the actual superheat at the outlet of the evaporator on the passenger compartment side; and the opening value of the electronic expansion valve corresponding to the battery is determined by looking up a table based on the difference between the actual water inlet temperature of the battery and the corrected target water inlet temperature of the battery, and the electronic expansion valve corresponding to the battery is controlled to be adjusted to the opening value.

[0017] In conjunction with the first aspect, in one implementation, the target water inlet temperature of the battery is corrected based on the difference between the actual air outlet temperature of the crew compartment and the target air outlet temperature.

[0018] In conjunction with the first aspect, in one implementation, determining the cooling priority of the battery and the crew compartment includes:

[0019] Determine if the battery temperature has reached the upper limit of the normal operating temperature, or if the passenger compartment has sufficient cooling capacity.

[0020] If the battery temperature reaches the upper limit of the normal operating temperature and / or the passenger compartment has sufficient cooling capacity, the cooling priority of the battery is higher than that of the passenger compartment; otherwise, the cooling priority of the passenger compartment is higher than that of the battery.

[0021] Secondly, embodiments of this application provide a control device for dual electronic expansion valves. The control device includes: a priority determination module for determining the cooling priority of the battery and the passenger compartment; and a control module for controlling one of the dual electronic expansion valves to use PID closed-loop control and controlling the other electronic expansion valve to use open-loop control by a lookup table method based on the cooling priority of the battery and the passenger compartment. The dual electronic expansion valves control battery cooling and the other electronic expansion valve controls passenger compartment cooling.

[0022] Thirdly, this application provides a control system for a dual electronic expansion valve, comprising: a battery heat exchanger, one side of which is connected to a battery cooling circuit and the other side to a refrigerant circuit, and a dual electronic expansion valve is provided on the refrigerant circuit; and the aforementioned control device, wherein a control module in the control device is connected to the dual electronic expansion valve, and the control module is used to control the opening degree of the dual electronic expansion valve.

[0023] Fourthly, embodiments of this application provide a vehicle equipped with the aforementioned control system.

[0024] Fifthly, embodiments of this application provide a dual electronic expansion valve control device, the dual electronic expansion valve control device including a processor, a memory, and a dual electronic expansion valve control program stored in the memory and executable by the processor, wherein when the dual electronic expansion valve control program is executed by the processor, the steps of the control method described above are implemented.

[0025] The beneficial effects of the technical solutions provided in this application include:

[0026] By prioritizing the cooling of the battery and the passenger compartment, the control method of the electronic expansion valve is determined. One electronic expansion valve adopts PID closed-loop control, while the other adopts open-loop control using a lookup table. In the dual electronic expansion valve control system, the two electronic expansion valves will not be controlled by PID closed-loop simultaneously, so they will not affect each other. Furthermore, the control of the electronic expansion valves is not related to the control logic of the compressor, thus avoiding system oscillation during dual cooling. This solves the technical problem in related technologies where the system oscillates and becomes uncontrollable when two electronic expansion valves work simultaneously. Attached Figure Description

[0027] Figure 1 is a flowchart illustrating an embodiment of a control method for a dual electronic expansion valve according to this application.

[0028] Figure 2 is a flowchart illustrating another embodiment of the control method for the dual electronic expansion valve of this application;

[0029] Figure 3 is a schematic diagram of the architecture of an embodiment of the control system of the dual electronic expansion valve of this application;

[0030] Figure 4 is a schematic diagram of the hardware structure of the dual electronic expansion valve control device involved in the embodiment of this application.

[0031] In the diagram: 1. Battery heat exchanger; 2. Battery cooling circuit; 21. Battery pack; 22. Water pump; 3. Refrigerant circuit; 31. Electronic expansion valve; 32. Condenser; 33. Evaporator; 34. Cooling fan; 35. Electric compressor; 36. Temperature and pressure sensor. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0033] In related technologies, the simultaneous use of superheat control by dual electronic expansion valves in a dual-cooling thermal management system can cause system oscillations. Specifically, in the initial stage of operation, the temperature of the passenger compartment and the battery can cause system oscillations, thereby affecting user comfort.

[0034] This application provides a control method, device, system, vehicle, and equipment for dual electronic expansion valves, which can solve the technical problem in related technologies where the system oscillates and cannot be controlled when dual electronic expansion valves work simultaneously.

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0036] In a first aspect, embodiments of this application provide a control method for a dual electronic expansion valve.

[0037] In one embodiment, referring to FIG1, FIG1 is a schematic flowchart of the first embodiment of the control method for the dual electronic expansion valve of this application. As shown in FIG1, the control method for the dual electronic expansion valve includes the following steps:

[0038] S1: Determine the cooling priority for the battery and the crew compartment.

[0039] In step S1, after determining the cooling priority of the battery and the cooling priority of the passenger compartment, it is determined whether the cooling priority of the battery is higher than that of the passenger compartment or vice versa. Subsequently, based on the priority, it is determined which electronic expansion valve 31 uses PID closed-loop control and which uses open-loop control via a lookup table.

[0040] S2: Based on the cooling priority of the battery and the passenger compartment, one of the dual electronic expansion valves 31 is controlled by PID closed-loop control, and the other electronic expansion valve 31 is controlled by open-loop control using a lookup table method. One of the dual electronic expansion valves 31 controls battery cooling, and the other electronic expansion valve 31 controls passenger compartment cooling.

[0041] In this embodiment, the control method is applicable to a thermal management control system employing two electronic expansion valves 31. One electronic expansion valve 31 controls battery cooling, and the other electronic expansion valve 31 controls passenger compartment cooling. After determining the cooling priority of the battery and passenger compartment, the system can determine which electronic expansion valve 31 uses PID closed-loop control based on the cooling priority, while the other electronic expansion valve 31 uses open-loop control via a lookup table. In the dual electronic expansion valve control system, by not using PID closed-loop control on the two electronic expansion valves 31 simultaneously, the two electronic expansion valves 31 will not affect each other. Furthermore, the control method for the electronic expansion valves 31 does not use compressor-related parameters and is not associated with the compressor's control logic, thus avoiding system oscillation during dual cooling. This solves the technical problem in related technologies where simultaneous operation of two electronic expansion valves 31 leads to system oscillation and uncontrollable conditions.

[0042] Optionally, in one embodiment, the step of controlling one of the dual electronic expansion valves 31 to use PID closed-loop control and controlling the other electronic expansion valve 31 to use open-loop control by lookup table method based on the cooling priority of the battery and the passenger compartment may include: for the battery and the passenger compartment with high cooling priority, controlling the corresponding electronic expansion valve 31 to use PID closed-loop control; for the battery and the passenger compartment with low cooling priority, controlling the corresponding electronic expansion valve 31 to use open-loop control by lookup table method.

[0043] In this embodiment, the cooling priority of the battery and the cooling priority of the passenger compartment are compared to determine whether the cooling priority of the battery or the cooling priority of the passenger compartment is higher. For the electronic expansion valve 31 with high cooling priority, PID closed-loop control is used to ensure superheat and thus ensure cooling capacity. For the electronic expansion valve 31 with low cooling priority, open-loop control is used by looking up a table.

[0044] Of course, in other embodiments, depending on actual needs, open-loop control with a lookup table can be used for cooling with high priority, while closed-loop control with PID can be used for cooling with low priority.

[0045] Based on the above technical solutions, in some optional embodiments, if the cooling priority of the battery is higher than that of the passenger compartment, the electronic expansion valve 31 corresponding to the battery is controlled by PID closed-loop control according to the difference between the target superheat and the actual superheat at the outlet of the battery-side evaporator 33; and the opening value of the electronic expansion valve 31 corresponding to the passenger compartment is determined by looking up a table according to the difference between the actual water temperature and the target water temperature of the battery, and the electronic expansion valve 31 corresponding to the passenger compartment is controlled to be adjusted to the opening value.

[0046] In this embodiment, the target superheat at the outlet of the battery-side evaporator 33 can be set to, for example, 5 degrees Celsius. The opening degree of the electronic expansion valve 31 corresponding to the difference between the actual battery inlet water temperature and the target battery inlet water temperature is shown in Table 1 below. After calculating the difference temp1 between the actual battery inlet water temperature and the target battery inlet water temperature, the corresponding opening degree can be directly found in Table 1, and then the corresponding electronic expansion valve 31 can be adjusted to that opening degree.

[0047] Table 1 Comparison of temp1 and Electronic Expansion Valve Openings in the Crew Cabin

[0048] Optionally, in one embodiment, if the cooling priority of the passenger compartment is higher than that of the battery, the electronic expansion valve 31 corresponding to the passenger compartment is controlled by PID closed-loop control based on the difference between the target superheat and the actual superheat at the outlet of the evaporator 33 on the passenger compartment side. Furthermore, the opening value of the electronic expansion valve 31 corresponding to the battery is determined by looking up a table based on the difference between the actual inlet water temperature and the corrected target inlet water temperature of the battery, and the electronic expansion valve 31 corresponding to the battery is adjusted to this opening value. In this embodiment, if the cooling priority of the passenger compartment is high, the electronic expansion valve 31 controlling the cooling of the passenger compartment uses PID regulation. The target superheat at the outlet of the evaporator 33 on the passenger compartment side is set to X degrees (e.g., X = 5). The opening degree of the electronic expansion valve 31 controlling the cooling of the passenger compartment is determined by the difference between the target superheat and the actual superheat at the outlet of the evaporator 33 on the passenger compartment side, and closed-loop control is performed. For batteries with relatively low cooling priority, since the air conditioning flow distribution affects the corresponding electronic expansion valve 31, it is necessary to correct the target inlet water temperature of the battery in real time. Based on the difference temp2 between the actual inlet water temperature and the corrected target inlet water temperature, refer to Table 2 to determine the opening value of the corresponding electronic expansion valve 31, and then control the electronic expansion valve 31 to adjust to that opening value. Tables 1 and 2 can be calibrated according to the actual project requirements.

[0049] Table 2 Comparison of temp2 and the opening degree of the battery's electronic expansion valve

[0050] Based on the above technical solution, in one embodiment, when obtaining the corrected target battery water inlet temperature, the target battery water inlet temperature can be corrected according to the difference between the actual air outlet temperature of the passenger compartment and the target air outlet temperature. In this embodiment, the actual air outlet temperature of the passenger compartment and the target air outlet temperature can be obtained first, the difference temp3 can be calculated, and then the corrected target battery water inlet temperature can be obtained by referring to Table 3 (temp3 and target battery water inlet temperature comparison table). Table 3 can also be calibrated according to the actual project.

[0051] Table 3 Comparison of temp3 and target water temperature for battery immersion

[0052] Optionally, in some alternative embodiments, determining the cooling priority of the battery and the crew compartment may include:

[0053] S11: Determine whether the battery temperature has reached the upper limit of the normal operating temperature, or whether the passenger compartment has sufficient cooling capacity.

[0054] S12: If the battery temperature reaches the upper boundary of the normal operating temperature and / or the passenger compartment has sufficient cooling capacity, the cooling priority of the battery is higher than that of the passenger compartment; otherwise, the cooling priority of the passenger compartment is higher than that of the battery.

[0055] As shown in Figure 2, in this embodiment, the core temperature and the outlet air temperature of the target air duct in the passenger compartment can be monitored in real time. If the core temperature (T) ≥ T1 or the outlet air temperature of the target air duct in the passenger compartment (t) ≥ t1, that is, including the three cases of T ≥ T1 and t ≥ t1, T ≥ T1 and t < t1, and T < T1 and t ≥ t1, the cooling priority of the battery is higher than that of the passenger compartment.

[0056] Among them, T1: T1 is the highest core temperature at the upper boundary of the battery's safe operation. This value is related to the core material, the layout position of the NTC (Negative Temperature Coefficient Thermistor), and the battery charge. Therefore, different models of battery packs 21 have different T1 values, which are provided by the battery supplier (50°C).

[0057] t1: t1 is related to the cooling capacity of the thermal management system, the ambient temperature, and the battery charge and discharge rate. For a vehicle model with a constant system cooling capacity, the impact on t1 remains unchanged; the higher the ambient temperature, the larger t1; the larger the battery charge and discharge rate, the larger t1. t1 = k1 * t_env * k2 * I * t_base; k1: the influence coefficient of the ambient temperature on t1; t_env: the ambient temperature; k2: the influence coefficient of the charge and discharge on t1; I: the discharge rate; t_base: the base temperature (9°C).

[0058] If the core temperature (T) ≤ T2 and the outlet air temperature of the target air duct in the passenger compartment (t) ≤ t2, that is, including the case of T ≤ T2 and t ≤ t2, the cooling priority of the passenger compartment is higher than that of the battery.

[0059] Among them, T2: T2 is the highest core temperature when exiting the upper boundary of the battery's safe operation, and T2 = T1 - 8°C (provided by the battery supplier).

[0060] t2: t2 is the lowest temperature to meet the cooling of the passenger compartment, and t2 = t1 - 5°C (calibrated value).

[0061] When the core temperature is rising:

[0062] If T2 < T < T1 and t2 < t < t1, the cooling priority of the passenger compartment is higher than that of the battery.

[0063] If T2 < T < T1 and t ≤ t2, the cooling priority of the passenger compartment is higher than that of the battery.

[0064] If T < T2 and t2 < t < t1, the cooling priority of the passenger compartment is higher than that of the battery.

[0065] When the temperature of the battery cell is decreasing:

[0066] If T2 < T < T1 and t2 < t < t1, the cooling priority of the battery is higher than that of the passenger compartment.

[0067] If T2 < T < T1 and t ≤ t2, the cooling priority of the battery is higher than that of the passenger compartment.

[0068] If T < T2 and t2 < t < t1, the cooling priority of the passenger compartment is higher than that of the battery.

[0069] In this embodiment, since the battery is less sensitive to temperature than the user, but the battery has a higher safety requirement than the user, the general principle for determining the priorities of the battery and the passenger compartment is that when the battery temperature reaches the upper boundary of the normal operating temperature or the passenger compartment has sufficient cooling capacity, the battery is prioritized; when the battery temperature is lower than the upper boundary and the passenger compartment does not have sufficient cooling capacity, the passenger compartment is prioritized.

[0070] When the battery is prioritized, the system meets the cooling demand of the battery, and the electronic expansion valve 31 corresponding to the battery is closed-loop controlled by superheat; the remaining cooling capacity of the system is allocated to the passenger compartment, and the electronic expansion valve 31 corresponding to the passenger compartment is open-loop controlled by looking up a table.

[0071] When the passenger compartment is prioritized, the system meets the cooling demand of the passenger compartment, and the electronic expansion valve 31 corresponding to the passenger compartment is closed-loop controlled by superheat, and the remaining cooling capacity of the system is allocated to the battery, and the electronic expansion valve 31 corresponding to the battery is open-loop controlled by looking up a table.

[0072] This control method performs coordinated control on the dual electronic expansion valves 31. First, it determines the cooling priorities of the battery and the passenger compartment. The electronic expansion valve 31 with a higher cooling priority is controlled by PID, and the electronic expansion valve 31 with a lower cooling priority is controlled by looking up a table. Moreover, the control of the electronic expansion valve 31 is not logically associated with the compressor, avoiding system oscillation during dual cooling and reducing the software implementation and calibration difficulties. In the related technology, the passenger compartment cooling uses an electronic expansion valve 31, and the battery cooling also uses an electronic expansion valve 31, resulting in poor stability of the thermal management system. During dual electronic expansion valve control, the system will oscillate. By this control method, system oscillation can be avoided, the cooling capacity can be effectively allocated, and the cooling demands of the battery and the passenger compartment can be met.

[0073] Secondly, this application embodiment also provides a control device for dual electronic expansion valves. The control device may include: a priority determination module, which is used to determine the cooling priority of the battery and the passenger compartment; and a control module, which is used to control one of the dual electronic expansion valves 31 to adopt PID closed-loop control and control the other electronic expansion valve 31 to adopt open-loop control by lookup table method based on the cooling priority of the battery and the passenger compartment. In this case, one of the dual electronic expansion valves 31 controls battery cooling and the other electronic expansion valve 31 controls passenger compartment cooling.

[0074] The functions of each module in the control device of the dual electronic expansion valve correspond to the steps in the control method embodiment of the dual electronic expansion valve, and their functions and implementation processes will not be described in detail here.

[0075] Thirdly, this application also provides a control system for a dual electronic expansion valve, which may include: a battery heat exchanger 1, one side of which is connected to a battery cooling circuit 2 and the other side is connected to a refrigerant circuit 3, and a dual electronic expansion valve 31 is provided on the refrigerant circuit 3; and the aforementioned control device, wherein a control module in the control device is connected to the dual electronic expansion valve 31, and the control module is used to control the opening degree of the dual electronic expansion valve 31.

[0076] Referring to Figure 3, in this embodiment, a condenser 32 and an evaporator 33 are also provided on the refrigerant circuit 3. A liquid receiver is provided at the end of the condenser 32, and a cooling fan 34 is provided on one side of the condenser 32. An electric compressor 35 is provided between the condenser 32 and the battery heat exchanger 1. 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. A battery pack 21 and a water pump 22 are provided on the battery cooling circuit 2. Refrigerant flows through one side of the battery heat exchanger 1, and coolant flows through the other side. The water pump 22 drives the coolant to flow into the battery pack 21. A temperature sensor is arranged at the inlet of the battery pack 21, and then the heat inside the battery pack 21 is transferred to the refrigerant in the battery heat exchanger 1. The heat of the battery is carried away by the evaporation of the refrigerant.

[0077] Fourthly, embodiments of this application also provide a vehicle equipped with the aforementioned control system.

[0078] Fifthly, embodiments of this application provide a dual electronic expansion valve control device, which can be a device with data processing capabilities such as a personal computer (PC), a laptop computer, or a server.

[0079] Referring to Figure 4, which is a schematic diagram of the hardware structure of the dual electronic expansion valve control device involved in the embodiment of this application, the dual electronic expansion valve control device may include a processor, a memory, a communication interface, and a communication bus in this embodiment.

[0080] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0081] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting components within the dual-electronic expansion valve control device, as well as interfaces used for interconnecting the dual-electronic expansion valve control device with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0082] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0083] The processor can be a general-purpose processor, which can call the dual-electronic expansion valve control program stored in the memory and execute the control method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the dual-electronic expansion valve control program is called can be referred to in the various embodiments of the dual-electronic expansion valve control method of this application, and will not be repeated here.

[0084] Those skilled in the art will understand that the hardware structure shown in Figure 4 does not constitute a limitation of this application, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0085] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0086] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0087] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0088] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0089] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0090] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0091] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A control method for a dual electronic expansion valve, characterized in that, The control method includes the following steps: Determine the cooling priority for the battery and the crew compartment; Based on the cooling priorities of the battery and the passenger compartment, one of the dual electronic expansion valves is controlled by PID closed-loop control, while the other electronic expansion valve is controlled by open-loop control using a lookup table method. Specifically, one of the dual electronic expansion valves controls battery cooling, while the other electronic expansion valve controls passenger compartment cooling.

2. The control method for the dual electronic expansion valve as described in claim 1, characterized in that, The cooling priority based on the battery and the passenger compartment, controlling one of the dual electronic expansion valves using PID closed-loop control and controlling the other electronic expansion valve using open-loop lookup table control, includes: For batteries and passenger compartments with high cooling priority, the corresponding electronic expansion valves are controlled using PID closed-loop control; for batteries and passenger compartments with low cooling priority, the corresponding electronic expansion valves are controlled using open-loop control with a lookup table.

3. The control method for the dual electronic expansion valve as described in claim 2, characterized in that, If the cooling priority of the battery is higher than that of the passenger compartment, the electronic expansion valve corresponding to the battery is controlled by PID closed-loop control based on the difference between the target superheat and the actual superheat at the outlet of the battery-side evaporator. and, The opening value of the electronic expansion valve corresponding to the passenger compartment is determined by referring to a table based on the difference between the actual water temperature of the battery and the target water temperature of the battery, and the electronic expansion valve corresponding to the passenger compartment is adjusted to that opening value.

4. The control method for the dual electronic expansion valve as described in claim 2, characterized in that, If the cooling priority of the passenger compartment is higher than that of the battery, the electronic expansion valve corresponding to the passenger compartment is controlled by PID closed-loop control based on the difference between the target superheat and the actual superheat at the outlet of the evaporator on the passenger compartment side. and, The opening value of the electronic expansion valve corresponding to the battery is determined by referring to a table based on the difference between the actual water temperature of the battery and the corrected target water temperature of the battery, and the electronic expansion valve corresponding to the battery is controlled to adjust to that opening value.

5. The control method for the dual electronic expansion valve as described in claim 4, characterized in that, The target water inlet temperature of the battery is adjusted based on the difference between the actual air outlet temperature of the crew compartment and the target air outlet temperature.

6. The control method for the dual electronic expansion valve as described in claim 1, characterized in that, The determination of the cooling priority for the battery and the crew compartment includes: Determine if the battery temperature has reached the upper limit of the normal operating temperature, or if the passenger compartment has sufficient cooling capacity. If the battery temperature reaches the upper limit of the normal operating temperature and / or the passenger compartment has sufficient cooling capacity, the cooling priority of the battery is higher than that of the passenger compartment; otherwise, the cooling priority of the passenger compartment is higher than that of the battery.

7. A control device for dual electronic expansion valves, characterized in that, The control device includes: Priority determination module, which is used to determine the cooling priority of the battery and the crew compartment; The control module is used to prioritize cooling based on the battery and the passenger compartment. It controls one of the dual electronic expansion valves using PID closed-loop control and the other electronic expansion valve using lookup table open-loop control. One of the dual electronic expansion valves controls battery cooling, and the other electronic expansion valve controls passenger compartment cooling.

8. A control system for a dual electronic expansion valve, characterized in that, It includes: A battery heat exchanger (1) is connected to a battery cooling circuit (2) on one side and a refrigerant circuit (3) on the other side, and a dual electronic expansion valve (31) is provided on the refrigerant circuit (3). And the control device as described in claim 7, wherein the control module in the control device is connected to the dual electronic expansion valve (31), and the control module is used 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 as described in claim 8.

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

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