Downhill auxiliary driving device for electrically-driven automobile, and control method

Abstract

The invention discloses a downhill auxiliary driving device for an electrically-driven automobile, and a control method. The downhill auxiliary driving device comprises a switch module, a target speed module, a speed control module and a braking force distribution module, wherein the switch module is used for starting or stopping the downhill auxiliary driving device according to operations of a driver and the traveling condition of the automobile; the target speed module is used for recording an instantaneous speed when the downhill auxiliary driving device is started by the switch module, as a target speed,; the speed control module is used for calculating target braking torque required for maintaining the target speed according to a difference value between a current real-time speed and the target speed; and the braking force distribution module is used for controlling power recovery of a drive motor so as to provide braking torque the same as the target braking torque. According to the downhill auxiliary driving device disclosed by the invention, the braking torque in a downhill gliding process is produced through the kinetic energy recovery function of the drive motor, so that energy consumed through friction braking is reduced, and the driver can conveniently control and change the speed in the downhill gliding process through operations the same as ordinary driving habits.

Description

technical field [0001] The invention relates to an auxiliary driving device and a control method for a vehicle, in particular to an auxiliary driving device and a control method for an electrically driven vehicle. Background technique [0002] Automobile auxiliary driving devices are used more and more in automobile control technology, giving drivers more convenience and safety. [0003] Adaptive Cruise Control (ACC) is an existing automatic control system, which is developed on the basis of cruise control technology. During the driving process of the vehicle, the vehicle distance sensor (radar) installed in the front of the vehicle continuously scans the road ahead of the vehicle, while the wheel speed sensor collects the vehicle speed signal. When the distance to the vehicle in front is too small, the ACC control unit can properly brake the wheels by coordinating with the anti-lock braking system and the engine control system, and reduce the output power of the engine so ...

AI Technical Summary

Problems solved by technology

In the field of electric vehicles, the electric motor used for power output cannot provide braking force like a traditional internal combustion engine to control the speed of the vehicle, so the existing auxiliary driving devices cannot be applied to electric drive vehicles

And the use of braking system for control also converts energy into heat energy and dissipates it, which is very unfavorable for energy saving and environmental protection, especially in long-distance downhill roads

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