CN-121355476-B - Electronic expansion valve control method and device, battery cooling system and new energy automobile

CN121355476BCN 121355476 BCN121355476 BCN 121355476BCN-121355476-B

Abstract

The application relates to the field of new energy automobiles, and provides an electronic expansion valve control method and device, a battery cooling system and a new energy automobile. The method includes currently based on a battery cooling system The average temperature of the current battery, the evaporation temperature of the current refrigerant and the opening of the current electronic expansion valve at moment, and the battery cooling system is predicted in the future The electronic expansion valve opening optimal control sequence is obtained by correcting the electronic expansion valve opening optimal control sequence based on the electronic expansion valve opening feedforward control sequence and the electronic expansion valve opening feedback control sequence, and the electronic expansion valve driver is controlled to regulate and control the current electronic expansion valve opening of the electronic expansion valve in the battery cooling system based on the electronic expansion valve opening output control sequence. The application can obviously improve the response speed of the system, can adapt to different running working conditions and environmental temperatures of vehicles, and has higher control precision.

Inventors

ZU WEIWEI
Sha Yingdi
GUO XIAOTIAN

Assignees

重庆同沃汽车科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251217

Claims (9)

1. An electronic expansion valve control method, characterized by comprising: Currently based battery cooling systems Predicting the future of the battery cooling system by the current average battery temperature, the current refrigerant evaporation temperature and the current electronic expansion valve opening at moment An electronic expansion valve opening optimal control sequence at moment, wherein i is more than or equal to 0 and less than or equal to N-1, and N represents the predicted total step number; determining an electronic expansion valve opening feedforward control sequence of the battery cooling system based on a current battery thermal load predicted value of the battery cooling system, and determining an electronic expansion valve opening feedback control sequence of the battery cooling system based on the current average battery temperature and a target battery temperature; Correcting the electronic expansion valve opening optimal control sequence based on the electronic expansion valve opening feedforward control sequence and the electronic expansion valve opening feedback control sequence to obtain an electronic expansion valve opening output control sequence; And controlling an electronic expansion valve driver to regulate and control the current electronic expansion valve opening of the electronic expansion valve in the battery cooling system based on the electronic expansion valve opening output control sequence.
2. The method of claim 1, wherein the battery-based cooling system is current Predicting future according to the current average battery temperature, the current refrigerant evaporation temperature and the current electronic expansion valve opening at moment Before the electronic expansion valve opening optimal control sequence at the moment, the method further comprises the following steps: Determining a target battery temperature, and calculating a temperature deviation value between the current average battery temperature and the target battery temperature; If the temperature deviation value is smaller than a preset temperature difference threshold value, controlling the battery cooling system to enter a single-branch circulation cooling mode; And if the temperature deviation value is greater than or equal to a preset temperature difference threshold value, controlling the battery cooling system to enter a double-branch circulation cooling mode.
3. The method of claim 2, wherein determining the target battery temperature comprises: acquiring battery working state information of the battery cooling system at the current k moment, wherein the battery working state information comprises a battery charge state, a battery charge-discharge multiplying power and an environment temperature; And determining a target battery temperature based on the battery operating state information.
4. The method of claim 1, wherein the battery-based cooling system is current Predicting future according to the current average battery temperature, the current refrigerant evaporation temperature and the current electronic expansion valve opening at moment The electronic expansion valve opening optimal control sequence at the moment comprises the following steps: based on the battery cooling system being present Predicting the future of the battery cooling system by the current average battery temperature, the current refrigerant evaporation temperature and the current electronic expansion valve opening at moment Predicting the average temperature of the battery and the evaporating temperature of the refrigerant at the moment; Based on target battery temperature, the battery cooling system is in the future The method comprises the steps of predicting average battery temperature and predicted refrigerant evaporation temperature at moment, and constructing a target optimization function by a preset electronic expansion valve opening punishment coefficient; Predicting the future of the battery cooling system based on the objective optimization function and a preset constraint condition And (5) an electronic expansion valve opening optimal control sequence at the moment.
5. The method of claim 4, wherein the battery cooling system is currently based on Predicting the future of the battery cooling system by the current average battery temperature, the current refrigerant evaporation temperature and the current electronic expansion valve opening at moment The predicted battery average temperature and the predicted refrigerant evaporation temperature at the moment include: Acquiring battery state parameters and refrigerant state parameters; Predicting the future of the battery cooling system based on the current average battery temperature, the current refrigerant evaporation temperature and the battery state parameter Predicting the average temperature of the battery at the moment; Predicting the future of the battery cooling system based on the current average battery temperature, the current refrigerant evaporation temperature, the refrigerant state parameter and the current electronic expansion valve opening The refrigerant evaporating temperature is predicted at the moment.
6. The method according to claim 1, wherein the method further comprises: determining the current refrigerant superheat degree and the current refrigerant evaporation pressure based on the current refrigerant evaporation temperature; And if the battery cooling system meets a preset electronic expansion valve forced closing condition, controlling the electronic expansion valve driver to forcibly close the electronic expansion valve in the battery cooling system, wherein the preset electronic expansion valve forced closing condition comprises at least one of that the average temperature of the current battery is smaller than a preset temperature threshold value, the evaporation pressure of the current refrigerant is smaller than a preset pressure threshold value or the superheat degree of the current refrigerant is smaller than a preset superheat degree threshold value.
7. An electronic expansion valve control device, characterized by comprising: a prediction module configured to be currently based on a battery cooling system Predicting the future of the battery cooling system by the current average battery temperature, the current refrigerant evaporation temperature and the current electronic expansion valve opening at moment An electronic expansion valve opening optimal control sequence at moment, wherein i is more than or equal to 0 and less than or equal to N-1, and N represents the predicted total step number; A first determination module configured to determine an electronic expansion valve opening feedforward control sequence of the battery cooling system based on a current battery thermal load prediction value of the battery cooling system, and determine an electronic expansion valve opening feedback control sequence of the battery cooling system based on the current battery average temperature and a target battery temperature; The correction module is configured to correct the electronic expansion valve opening optimal control sequence based on the electronic expansion valve opening feedforward control sequence and the electronic expansion valve opening feedback control sequence to obtain an electronic expansion valve opening output control sequence; and the first control module is configured to control an electronic expansion valve driver to regulate and control the current electronic expansion valve opening of the electronic expansion valve in the battery cooling system based on the electronic expansion valve opening output control sequence.
8. A battery cooling system, comprising: a controller comprising the electronic expansion valve control device according to claim 7; an electronic expansion valve driver in communication with the controller; the electronic expansion valve is electrically connected with the electronic expansion valve driver; The first liquid storage device is arranged on the first liquid storage device, the first liquid reservoir comprises a refrigerant output port; The battery cooling assembly comprises a refrigerant input port; The electronic expansion valve is positioned between the refrigerant output port and the refrigerant input port; The battery cooling assembly is used for cooling the power battery.
9. A new energy vehicle, characterized in that it comprises the battery cooling system according to claim 8.

Description

Electronic expansion valve control method and device, battery cooling system and new energy automobile Technical Field The application relates to the field of new energy automobiles, in particular to an electronic expansion valve control method and device, a battery cooling system and a new energy automobile. Background Along with the continuous improvement of requirements of new energy automobiles on endurance mileage and safety, the importance of a battery thermal management system is increasingly highlighted. The traditional liquid cooling system has the problems of low heat exchange efficiency, complex system, heavy weight and the like. The direct cooling technology of the battery realizes high-efficiency heat exchange by directly introducing the refrigerant into the battery cooling plate, and becomes a research hot spot of a new generation of heat management scheme. In a direct battery cooling system, an Electronic Expansion Valve (EEV) is used as a key execution component, and the control precision of the electronic expansion valve directly influences the stability of the battery temperature and the energy efficiency of the system. However, the existing EEV control method is generally based on a superheat degree or fixed opening degree strategy, is difficult to adapt to dynamic thermal load change of a battery, and has the problems of response lag, large temperature fluctuation and the like. Therefore, there is a need to provide an EEV control method that has high adaptability, fast response, and high control accuracy. Disclosure of Invention In view of the above, the embodiment of the application provides a control method and a device for an electronic expansion valve, a battery cooling system and a new energy automobile, so as to solve the problems that the existing EEV control method is difficult to adapt to the dynamic thermal load change of a battery, and has lag response and low control precision. In a first aspect of an embodiment of the present application, there is provided a control method for an electronic expansion valve, including: Currently based battery cooling systems The average temperature of the current battery, the evaporation temperature of the current refrigerant and the opening of the current electronic expansion valve at moment, and the battery cooling system is predicted in the futureAn electronic expansion valve opening optimal control sequence at moment, wherein i is more than or equal to 0 and less than or equal to N-1, and N represents the predicted total step number; determining an electronic expansion valve opening feedforward control sequence of the battery cooling system based on a current battery thermal load predicted value of the battery cooling system, and determining an electronic expansion valve opening feedback control sequence of the battery cooling system based on the current average battery temperature and a target battery temperature; correcting the electronic expansion valve opening optimal control sequence based on the electronic expansion valve opening feedforward control sequence and the electronic expansion valve opening feedback control sequence to obtain an electronic expansion valve opening output control sequence; And controlling the electronic expansion valve driver to regulate and control the current electronic expansion valve opening of the electronic expansion valve in the battery cooling system based on the electronic expansion valve opening output control sequence. In a second aspect of the embodiment of the present application, there is provided an electronic expansion valve control device, including: a prediction module configured to be currently based on a battery cooling system The average temperature of the current battery, the evaporation temperature of the current refrigerant and the opening of the current electronic expansion valve at moment, and the battery cooling system is predicted in the futureAn electronic expansion valve opening optimal control sequence at moment, wherein i is more than or equal to 0 and less than or equal to N-1, and N represents the predicted total step number; A first determination module configured to determine an electronic expansion valve opening feedforward control sequence of the battery cooling system based on a current battery thermal load prediction value of the battery cooling system, and determine an electronic expansion valve opening feedback control sequence of the battery cooling system based on the current battery average temperature and a target battery temperature; The correction module is configured to correct the electronic expansion valve opening optimal control sequence based on the electronic expansion valve opening feedforward control sequence and the electronic expansion valve opening feedback control sequence to obtain an electronic expansion valve opening output control sequence; The first control module is configured to control the electronic expansion valve driver to regulate and co