Low-temperature control method and device for hybrid electric vehicle

Abstract

The invention relates to the technical field of vehicles and provides a low-temperature control method and device for a hybrid electric vehicle. The control method comprises steps that the temperature of a battery pack of the hybrid electric vehicle is detected; when it is detected that the temperature of the battery pack is smaller than the preset temperature, the request torque of an accelerator pedal of the hybrid electric vehicle is detected; and when it is judged that the request torque is larger than the maximum torque capable of being output by the motor, the motor is controlled to output at the maximum torque, and an engine of the hybrid electric vehicle is controlled to output the torque of the difference between the request torque and the maximum torque capable of being output by the motor, so the hybrid electric vehicle runs. The method is advantaged in that the temperature of the battery can be rapidly increased, and performance of the hybrid electric vehicle is effectively improved.

Description

technical field [0001] The invention relates to the field of vehicle technology, in particular to a low temperature control method and device for a hybrid vehicle. Background technique [0002] At present, the torque distribution between the motor and the engine in hybrid vehicles is mainly: when the requested torque is greater than the output torque at the optimum efficiency of the engine, the engine is controlled to output torque according to the optimum efficiency, and the remaining torque is output by the electric motor. When the requested torque is not greater than the output torque at the best efficiency of the engine, the engine is controlled to output torque according to the best efficiency, and then the motor converts the excess mechanical energy of the engine into electrical energy and stores it in the battery pack. However, when the temperature is relatively low, the charging and discharging capacity of the battery drops sharply, and it is difficult for the vehicl...

AI Technical Summary

Problems solved by technology

However, when the temperature is relatively low, the charging and discharging capacity of the battery drops sharply, and it is difficult for the vehicle to store electric energy in the battery pack when decelerating or braking, causing the battery pack to stay in a low temperature state for a long time, making it difficult to participate in normal work, resulting in hybrid poor car performance

Images