Temperature control method of power battery and vehicle control unit

Abstract

The invention provides a temperature control method for a power battery and a vehicle control unit, and the method comprises the steps: when a target hybrid vehicle is started, the battery temperatureof the power battery of the target hybrid vehicle and the engine temperature of an engine are acquired in real time; if the battery temperature is smaller than or equal to the first threshold value,the BMS is controlled to conduct self-heating, and the engine is made to operate at a working idle speed value corresponding to the engine temperature; if the engine temperature is larger than or equal to the second threshold value, a target valve in a heat consumption management system is opened, and the power battery and the engine conduct heat exchange through a heat exchanger; when the batterytemperature is increased to a third threshold value, the engine is controlled to enter a normal driving control state until the battery temperature is increased to a fourth threshold value, and the target valve is closed; and in the running process of the whole vehicle, the BMS or the target valve is controlled, and the battery temperature is made to be larger than or equal to a fifth threshold value. By controlling the working modes of the engine, the BMS and the target valve, the charging performance is kept in a good state, and the safety and economy of the whole vehicle are improved.

Description

technical field [0001] The invention relates to the field of control technology, in particular to a method for controlling the temperature of a power battery and a vehicle controller. Background technique [0002] With the development of science and technology, hybrid power systems are gradually being widely used in the automotive industry, and the performance of power batteries in hybrid power systems has a greater impact on the state of hybrid vehicles. [0003] For hybrid vehicles such as hybrid heavy-duty trucks, if the charging performance of the power battery is poor when driving in a low-temperature environment, it will lead to a decrease in energy recovery of the vehicle and an increase in the use of the vehicle's mechanical braking system, thereby increasing the safety hazard of the vehicle. Therefore, how to ensure the charging performance of the power battery in a low temperature environment is an urgent problem to be solved. Contents of the invention [0004] ...

AI Technical Summary

Problems solved by technology

[0003] For hybrid vehicles such as hybrid heavy-duty trucks, if the charging performance of the power battery is poor when driving in a low-temperature environment, it will lead to a decrease in energy recovery of the vehicle and an increase in the use of the vehicle's mechanical braking system, thereby increasing the safety hazard of the vehicle. Therefore, how to ensure the charging performance of the power battery in a low temperature environment is an urgent problem to be solved.

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