A control method and device of a pure electric vehicle cooling system

Abstract

This invention discloses a control method and device for a cooling system of a pure electric vehicle. The method involves determining whether the electronic expansion valve of the passenger compartment and the electronic expansion valve of the battery are malfunctioning. If both electronic expansion valves are functioning correctly, the method determines whether the electric vehicle is in fast charging mode or normal driving discharge mode. If so, it determines whether the air conditioning is on. If on, the method compares the current battery temperature with different set temperature ranges to find the corresponding range's requested battery water pump speed. It also compares the current passenger compartment air conditioning set temperature with different set temperature ranges to find the corresponding range's requested motor water pump speed. Based on the requested battery water pump speed and the requested motor water pump speed, the method determines the compressor speed. Finally, it uses the ratio of the requested motor water pump speed to the compressor speed to determine the opening degree of the passenger compartment's electronic expansion valve and the ratio of the requested battery water pump speed to the compressor speed to determine the opening degree of the battery's electronic expansion valve.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a control method and apparatus for a cooling system of a pure electric vehicle. Background Technology

[0002] The statements in this section merely refer to the background art related to this invention and do not necessarily constitute prior art.

[0003] As society has developed to its current stage, the energy crisis and environmental pollution have become major obstacles to global development. High international oil prices have led to an increase in people's cost of living. In the taxi and ride-hailing sector, the proportion of pure electric vehicles is increasing. Pure electric vehicles have advantages such as low operating costs, zero emissions, low noise, and the ability to make full use of off-peak electricity. However, due to factors such as driving range and charging speed, pure electric vehicles have not been widely accepted by drivers.

[0004] Currently, the charging time for pure electric vehicle batteries is relatively long. Under normal charging conditions, it takes 8 hours to fully charge. Although fast charging can achieve about 80% charge in 30 minutes, it may seriously affect the lifespan of the power battery, leading to increased operating costs. For taxi drivers, the current driving range of pure electric vehicles is insufficient, and time is very precious. Using air conditioning during charging will greatly prolong the charging time, affecting the user experience of electric vehicles. Existing technology cannot meet the requirements of shortening fast charging time while also satisfying the temperature comfort requirements of the passenger compartment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a control method and device for a cooling system of a pure electric vehicle; it can reasonably control the operating status of the compressor speed, battery water pump, motor water pump, and electronic expansion valve, shorten the fast charging time, and meet the comfort requirements of the passenger cabin.

[0006] In a first aspect, the present invention provides a control method for a cooling system of a pure electric vehicle;

[0007] A control method for a cooling system of a pure electric vehicle, comprising:

[0008] Determine if the electronic expansion valves of the passenger compartment and the battery are malfunctioning; if both electronic expansion valves are functioning correctly, proceed to the next step.

[0009] Determine whether the current pure electric vehicle is in fast charging mode or normal driving discharge mode; if so, proceed to the next step.

[0010] Determine if the air conditioning is on. If the air conditioning is on, compare the current battery temperature with different set temperature ranges to find the battery water pump request speed for the corresponding range; compare the current passenger cabin air conditioning set temperature with different set temperature ranges to find the motor water pump request speed for the corresponding range.

[0011] The compressor speed is determined based on the requested speeds of the battery water pump and the motor water pump; the opening degree of the electronic expansion valve in the passenger compartment is determined by referring to a table based on the ratio of the requested speed of the motor water pump to the compressor speed; and the opening degree of the electronic expansion valve of the battery is determined by referring to a table based on the ratio of the requested speed of the battery water pump to the compressor speed.

[0012] Secondly, the present invention provides a control device for a cooling system of a pure electric vehicle;

[0013] A control device for a cooling system of a pure electric vehicle, comprising:

[0014] The first judgment module is configured to: determine whether the electronic expansion valve of the crew compartment and the electronic expansion valve of the battery are malfunctioning; if both electronic expansion valves are not malfunctioning, then proceed to the second judgment module.

[0015] The second judgment module is configured to: determine whether the current pure electric vehicle is in fast charging mode or normal driving discharge mode; if so, proceed to the third judgment module.

[0016] The third judgment module is configured to: determine whether the air conditioner is turned on; if the air conditioner is turned on, compare the current battery temperature with different set temperature ranges and find the battery water pump request speed for the corresponding range; compare the current passenger cabin air conditioner set temperature with different set temperature ranges and find the motor water pump request speed for the corresponding range.

[0017] The compressor speed is determined based on the requested speeds of the battery water pump and the motor water pump; the opening degree of the electronic expansion valve in the passenger compartment is determined by referring to a table based on the ratio of the requested speed of the motor water pump to the compressor speed; and the opening degree of the electronic expansion valve of the battery is determined by referring to a table based on the ratio of the requested speed of the battery water pump to the compressor speed.

[0018] Thirdly, the present invention also provides an electronic device, comprising:

[0019] Memory, used for non-transitory storage of computer-readable instructions; and

[0020] Processor, for executing the computer-readable instructions,

[0021] When the computer-readable instructions are executed by the processor, they perform the method described in the first aspect above.

[0022] Fourthly, the present invention also provides a storage medium for non-transitory storage of computer-readable instructions, wherein, when the non-transitory computer-readable instructions are executed by a computer, the instructions for the method described in the first aspect are executed.

[0023] Fifthly, the present invention also provides a computer program product, including a computer program that, when run on one or more processors, is used to implement the method described in the first aspect above.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention takes into account the operating conditions of pure electric vehicles. Based on the needs of each system, it utilizes the temperature of the battery and passenger compartment to control the opening of the electronic expansion valves at the battery end and passenger compartment end, greatly reducing fast charging time. For taxi drivers, in the hot summer, this not only shortens fast charging time but also allows them to lie down in the car and turn on the air conditioning to rest. During normal driving, the opening of the electronic expansion valve is controlled according to the system's needs to ensure the comfort of the people and the vehicle system, control unnecessary waste of electricity, and ensure driving range. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] Figure 1 This is a schematic diagram of the crew compartment and battery cooling system in Embodiment 1 of this application;

[0028] Figures 2(a) and 2(b) are control strategy diagrams of the cooling system according to Embodiment 1 of this application;

[0029] Figure 3 This is the opening gauge of the electronic expansion valve at the battery end in Embodiment 1 of this application;

[0030] Figure 4 This is the opening gauge of the electronic expansion valve at the occupant compartment end in Embodiment 1 of this application. Detailed Implementation

[0031] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Furthermore, to facilitate a clear description of the technical solutions of the embodiments of the present invention, the terms "first" and "second" are used in the embodiments of the present invention to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0034] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0035] Example 1

[0036] This embodiment provides a control method for a cooling system of a pure electric vehicle;

[0037] A control method for a cooling system of a pure electric vehicle, comprising:

[0038] S101: Determine whether the electronic expansion valve of the crew compartment and the electronic expansion valve of the battery are malfunctioning; if both electronic expansion valves are not malfunctioning, proceed to S102.

[0039] S102: Determine whether the current pure electric vehicle is in fast charging mode or normal driving discharge mode; if so, proceed to S103.

[0040] S103: Determine whether the air conditioner is on. If the air conditioner is on, compare the current battery temperature with different set temperature ranges and find the battery water pump request speed for the corresponding range; compare the current passenger cabin air conditioner set temperature with different set temperature ranges and find the motor water pump request speed for the corresponding range.

[0041] The compressor speed is determined based on the requested speeds of the battery water pump and the motor water pump; the opening degree of the electronic expansion valve in the passenger compartment is determined by referring to a table based on the ratio of the requested speed of the motor water pump to the compressor speed; and the opening degree of the electronic expansion valve of the battery is determined by referring to a table based on the ratio of the requested speed of the battery water pump to the compressor speed.

[0042] Furthermore, the method also includes:

[0043] If the electronic expansion valve of the passenger compartment or the electronic expansion valve of the battery malfunctions, the vehicle controller will close both the electronic expansion valve of the passenger compartment or the electronic expansion valve of the battery.

[0044] Furthermore, the method also includes:

[0045] If the electric vehicle is not in fast charging mode or normal driving discharge mode, the vehicle controller will close the electronic expansion valve of the passenger compartment or the electronic expansion valve of the battery.

[0046] Furthermore, the method also includes:

[0047] S104: If the air conditioner is off, compare the current battery temperature with different set temperature ranges and find the battery water pump request speed for the corresponding range.

[0048] The compressor speed is determined based on the requested speed of the battery-powered water pump and the requested speed of the motor-driven water pump;

[0049] The opening degree of the battery's electronic expansion valve is determined by referring to a table based on the ratio of the battery water pump's requested speed to the compressor's speed.

[0050] Furthermore, the step of comparing the current battery temperature with different set temperature ranges to find the battery water pump request speed for the corresponding range specifically includes:

[0051] When T batt ≥T batt-max-set The required rotational speed of the battery-powered water pump is N. batt-max ;

[0052] When T batt-max-set >T batt ≥T batt-set1 The requested speed of the battery water pump is N. batt1 ;

[0053] When T batt-set1 >T batt ≥T batt-set2 The requested speed of the battery water pump is N. batt2 ;

[0054] When T batt-set2 >T batt ≥T batt-set-off The requested speed of the battery water pump is N. batt3 ;

[0055] When T batt-set-off >T batt Then the battery water pump requires a speed of 0.

[0056] Among them, Tbatt For battery temperature, T batt-max-set T is the highest set temperature for the battery. batt-set1 Set the battery temperature to level T. batt-set2 Set the battery temperature to the second setting, T batt-set-off Set the temperature to close the electronic expansion valve.

[0057] Furthermore, the step of comparing the current passenger cabin air conditioning setting temperature with different set temperature ranges to find the motor water pump request speed for the corresponding range specifically includes:

[0058] When T cc ≤T cc-min-set The required speed of the motor and water pump is N. cc-max ;

[0059] When T cc-min-set <T cc ≤T cc-set1 The required speed of the motor and water pump is N. cc1 ;

[0060] When T cc-set1 <T cc ≤T cc-set2 The required speed of the motor and water pump is N. cc2 ;

[0061] When T cc-set2 <T cc ≤T cc-set3 The required speed of the motor and water pump is N. cc3 ;

[0062] Among them, T cc Set the temperature for the current crew cabin air conditioning, T cc-min-set The minimum set temperature for the crew cabin, T cc-set1 Set the temperature in the passenger cabin to level 1, T cc-set2 Set the temperature to level two in the passenger cabin, T cc-set3 Set the temperature for the passenger cabin to three levels.

[0063] Furthermore, determining the compressor speed based on the requested speed of the battery water pump and the requested speed of the motor water pump specifically includes:

[0064] The compressor speed is obtained by summing the requested speed of the battery water pump and the requested speed of the motor water pump.

[0065] The compressor speed N is equal to the sum of the motor water pump speed and the battery water pump speed.

[0066] Furthermore, the opening degree of the electronic expansion valve in the passenger compartment is determined by looking up a table based on the ratio of the requested speed of the motor-pump to the speed of the compressor; wherein, the table lookup is as follows: Figure 3 As shown.

[0067] Furthermore, the opening degree of the battery's electronic expansion valve is determined by looking up a table based on the ratio of the battery water pump's requested rotational speed to the compressor's rotational speed; wherein, the table lookup is as follows: Figure 4 As shown.

[0068] like Figure 1 As shown, the vehicle is ready. The VCU (Vehicle Control Unit) provides control strategies and signal transmission and reception. It consists of two cooling circuits: one for cooling the passenger compartment and the other for cooling the battery pack.

[0069] The pure electric vehicle cooling system includes: a vehicle controller connected to the electronic expansion valve of the battery, the electronic expansion valve of the battery connected to a second cooler, the second cooler connected to a battery water pump and a condenser; and the battery water pump connected to a compressor.

[0070] The vehicle controller is connected to the BMS via a CAN bus.

[0071] The vehicle controller is connected to the air conditioner via a CAN bus. The air conditioner is connected to the electronic expansion valve of the passenger compartment. The electronic expansion valve of the passenger compartment is connected to the first cooler. The first cooler is connected to the condenser and the motor water pump. The motor water pump is connected to the compressor.

[0072] As shown in Figures 2(a) and 2(b), the different speeds of the motor water pump and the battery water pump are determined according to different operating conditions and different needs: during fast charging or normal driving discharge, when the air conditioner is on, the speed request of the battery water pump is controlled according to the set temperature range of the battery temperature; the speed request of the motor water pump is controlled according to the temperature required by the air conditioner in the passenger compartment; when the air conditioner is not on, only the battery water pump runs.

[0073] like Figure 3 As shown, the opening degree of the electronic expansion valve at the battery end is obtained by looking up the table based on the ratio of the battery water pump request value to the compressor speed.

[0074] like Figure 4 As shown, the opening degree of the electronic expansion valve at the occupant compartment end is obtained by looking up the table based on the ratio of the motor water pump request value to the compressor speed.

[0075] Example 2

[0076] This embodiment provides a control device for a cooling system of a pure electric vehicle;

[0077] A control device for a cooling system of a pure electric vehicle, comprising:

[0078] The first judgment module is configured to: determine whether the electronic expansion valve of the crew compartment and the electronic expansion valve of the battery are malfunctioning; if both electronic expansion valves are not malfunctioning, then proceed to the second judgment module.

[0079] The second judgment module is configured to: determine whether the current pure electric vehicle is in fast charging mode or normal driving discharge mode; if so, proceed to the third judgment module.

[0080] The third judgment module is configured to: determine whether the air conditioner is turned on; if the air conditioner is turned on, compare the current battery temperature with different set temperature ranges and find the battery water pump request speed for the corresponding range; compare the current passenger cabin air conditioner set temperature with different set temperature ranges and find the motor water pump request speed for the corresponding range.

[0081] The compressor speed is determined based on the requested speeds of the battery water pump and the motor water pump; the opening degree of the electronic expansion valve in the passenger compartment is determined by referring to a table based on the ratio of the requested speed of the motor water pump to the compressor speed; and the opening degree of the electronic expansion valve of the battery is determined by referring to a table based on the ratio of the requested speed of the battery water pump to the compressor speed.

[0082] It should be noted that the first judgment module, the second judgment module, and the third judgment module mentioned above correspond to steps S101 to S103 in Embodiment 1. The examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the content disclosed in Embodiment 1. It should be noted that the above modules, as part of the system, can be executed in a computer system such as a set of computer-executable instructions.

[0083] The descriptions of each embodiment in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0084] The proposed system can be implemented in other ways. For example, the system embodiments described above are merely illustrative, and the division of modules described above is only a logical functional division. In actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not executed.

[0085] Example 3

[0086] This embodiment also provides an electronic device, including: one or more processors, one or more memories, and one or more computer programs; wherein, the processor is connected to the memory, and the one or more computer programs are stored in the memory. When the electronic device is running, the processor executes the one or more computer programs stored in the memory to cause the electronic device to perform the method described in Embodiment 1.

[0087] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0088] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of memory may also include non-volatile random access memory. For example, memory may also store information about the device type.

[0089] In the implementation process, each step of the above method can be completed by the integrated logic circuits in the processor hardware or by software instructions.

[0090] The method in Embodiment 1 can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, a detailed description is not provided here.

[0091] Those skilled in the art will recognize that the units and algorithm steps described in connection with the various examples of this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0092] Example 4

[0093] This embodiment also provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, complete the method described in Embodiment 1.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for a cooling system of a pure electric vehicle, characterized in that, include: Determine if the electronic expansion valves of the crew compartment and the battery are malfunctioning; If neither of the two electronic expansion valves malfunctions, proceed to the next step. Determine whether the current pure electric vehicle is in fast charging mode or normal driving discharge mode; if so, proceed to the next step. Determine if the air conditioning is on. If the air conditioning is on, compare the current battery temperature with different set temperature ranges to find the battery water pump request speed for the corresponding range; compare the current passenger cabin air conditioning set temperature with different set temperature ranges to find the motor water pump request speed for the corresponding range. The step of comparing the current battery temperature with different set temperature ranges to find the battery water pump request speed for the corresponding range specifically includes: When T batt T batt-max-set The required rotational speed of the battery-powered water pump is N. batt-max ; When T batt-max-set >T batt T batt-set1 The requested speed of the battery water pump is N. batt1 ; When T batt-set1 >T batt T batt-set2 The requested speed of the battery water pump is N. batt2 ; When T batt-set2 >T batt T batt-set-off The requested speed of the battery water pump is N. batt3 ; When T batt-set-off >T batt Then the battery water pump requires a speed of 0. Among them, T batt For battery temperature, T batt-max-set T is the highest set temperature for the battery. batt-set1 Set the battery temperature to level T. batt-set2 Set the battery temperature to the second setting, T batt-set-off Set the temperature to close the electronic expansion valve; The step of comparing the current passenger cabin air conditioning setting temperature with different set temperature ranges to find the motor water pump request speed for the corresponding range specifically includes: When T cc ≤T cc-min-set The required speed of the motor and water pump is N. cc-max ; When T cc-min-set <T cc ≤T cc-set1 The required speed of the motor and water pump is N. cc1 ; When T cc-set1 <T cc ≤T cc-set2 The required speed of the motor and water pump is N. cc2 ; When T cc-set2 <T cc ≤ T cc-set3 The required speed of the motor and water pump is N. cc3 ; Among them, T cc Set the temperature for the current crew cabin air conditioning, T cc-min-set The minimum set temperature for the crew cabin, T cc-set1 Set the temperature in the passenger cabin to level 1, T cc-set2 Set the temperature to level two in the passenger cabin, T cc-set3 Set three temperature levels for the passenger cabin; The compressor speed is determined based on the requested speeds of the battery water pump and the motor water pump. Specifically, the requested speeds of the battery water pump and the motor water pump are summed to obtain the compressor speed. The compressor speed is equal to the sum of the motor water pump speed and the battery water pump speed. The opening degree of the electronic expansion valve in the passenger compartment is determined by looking up a table based on the ratio of the requested speed of the motor water pump to the compressor speed. The opening degree of the electronic expansion valve of the battery is determined by looking up a table based on the ratio of the requested speed of the battery water pump to the compressor speed.

2. The control method for a cooling system of a pure electric vehicle as described in claim 1, characterized in that, The method further includes: If the electronic expansion valve of the passenger compartment or the electronic expansion valve of the battery malfunctions, the vehicle controller will close the electronic expansion valve of the passenger compartment or the electronic expansion valve of the battery.

3. The control method for a cooling system of a pure electric vehicle as described in claim 1, characterized in that, The method further includes: If the electric vehicle is not in fast charging mode or normal driving discharge mode, the vehicle controller will close the electronic expansion valve of the passenger compartment or the electronic expansion valve of the battery.

4. The control method for a cooling system of a pure electric vehicle as described in claim 1, characterized in that, The method further includes: If the air conditioner is off, the current battery temperature is compared with different set temperature ranges to find the battery water pump request speed for the corresponding range; The compressor speed is determined based on the requested speed of the battery-powered water pump and the requested speed of the motor-driven water pump; The opening degree of the battery's electronic expansion valve is determined by referring to a table based on the ratio of the battery water pump's requested speed to the compressor's speed.

5. A control device for a cooling system of a pure electric vehicle, characterized in that, include: The first judgment module is configured to: determine whether the electronic expansion valve of the crew compartment and the electronic expansion valve of the battery are malfunctioning. If neither of the two electronic expansion valves malfunctions, proceed to the second judgment module; The second judgment module is configured to: determine whether the current pure electric vehicle is in fast charging mode or normal driving discharge mode; if so, proceed to the third judgment module. The third judgment module is configured to: determine whether the air conditioner is on; if the air conditioner is on, compare the current battery temperature with different set temperature ranges to find the battery water pump request speed for the corresponding range; compare the current passenger cabin air conditioner setting temperature with different set temperature ranges to find the motor water pump request speed for the corresponding range. Specifically, comparing the current battery temperature with different set temperature ranges to find the battery water pump request speed for the corresponding range includes: When T batt T batt-max-set The required rotational speed of the battery-powered water pump is N. batt-max ; When T batt-max-set >T batt T batt-set1 The requested speed of the battery water pump is N. batt1 ; When T batt-set1 >T batt T batt-set2 The requested speed of the battery water pump is N. batt2 ; When T batt-set2 >T batt T batt-set-off The requested speed of the battery water pump is N. batt3 ; When T batt-set-off >T batt Then the battery water pump requires a speed of 0. Among them, T batt For battery temperature, T batt-max-set T is the highest set temperature for the battery. batt-set1 Set the battery temperature to level T. batt-set2 Set the battery temperature to the second setting, T batt-set-off Set the temperature to close the electronic expansion valve; The step of comparing the current passenger cabin air conditioning setting temperature with different set temperature ranges to find the motor water pump request speed for the corresponding range specifically includes: When T cc ≤T cc-min-set The required speed of the motor and water pump is N. cc-max ; When T cc-min-set <T cc ≤T cc-set1 The required speed of the motor and water pump is N. cc1 ; When T cc-set1 <T cc ≤T cc-set2 The required speed of the motor and water pump is N. cc2 ; When T cc-set2 <T cc ≤ T cc-set3 The required speed of the motor and water pump is N. cc3 ; Among them, T cc Set the temperature for the current crew cabin air conditioning, T cc-min-set The minimum set temperature for the crew cabin, T cc-set1 Set the temperature in the passenger cabin to level 1, T cc-set2 Set the temperature to level two in the passenger cabin, T cc-set3 Set three temperature levels for the passenger cabin; The compressor speed is determined based on the requested speeds of the battery water pump and the motor water pump. Specifically, the requested speeds of the battery water pump and the motor water pump are summed to obtain the compressor speed. The compressor speed is equal to the sum of the motor water pump speed and the battery water pump speed. The opening degree of the electronic expansion valve in the passenger compartment is determined by looking up a table based on the ratio of the requested speed of the motor water pump to the compressor speed. The opening degree of the electronic expansion valve of the battery is determined by looking up a table based on the ratio of the requested speed of the battery water pump to the compressor speed.

6. An electronic device, characterized in that it comprises: Memory is used to store computer-readable instructions in a non-transitory manner. as well as Processor, for executing the computer-readable instructions, When the computer-readable instructions are executed by the processor, they perform the method described in any one of claims 1-4.

7. A storage medium, characterized in that, The computer-readable instructions are stored non-transitory, wherein when the non-transitory computer-readable instructions are executed by a computer, the instructions of the method according to any one of claims 1-4 are executed.

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