Auxiliary braking system and control method of electric vehicle and electric vehicle

Abstract

Provided are an auxiliary braking system (100) for an electric automobile and a control method thereof, and an electric automobile. The system (100) comprises: a speed detection device (110); a braking pedal position detection device (120); and a vehicle control unit (140). When a vehicle speed exceeds a predetermined vehicle speed, the vehicle control unit (140) determines, according to a variation in a braking pedal position and a time of the variation, an acceleration speed at which a braking pedal is pressed by the foot. If the acceleration speed exceeds a predetermined acceleration speed, the vehicle control unit determines, according to the vehicle speed, a wheel rotating speed and a predetermined tire slip ratio, a braking torque, and generates a feedback braking signal according to the braking torque. A wheel motor braking device (130) comprises a wheel braking motor (131). The wheel motor braking device (130) is used to exert a braking force on a wheel upon receiving the feedback braking signal such that the vehicle performs feedback braking. The auxiliary braking system (100) has a high braking response speed and achieves a short braking distance, thereby ensuring vehicle safety. Moreover, the auxiliary braking system has a simple structure and low costs.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an auxiliary braking system of an electric vehicle, a control method and the electric vehicle. Background technique [0002] Currently, vehicles are generally braked using a hydraulic braking system. For example, for power vehicles, auxiliary regenerative braking is sometimes performed by driving the motor. The structure of the hydraulic braking system itself on these vehicles is relatively complicated, and the response of the hydraulic braking system is slow and the cost is high. [0003] Vehicles that only use a hydraulic braking system for braking have a complex hydraulic braking system structure, a long assembly process and slow braking response, which in turn affects the braking effect and poses safety hazards. Even for vehicles that use hydraulic brakes and drive motor-assisted brakes, when performing emergency braking, the hydraulic brake system is usually used as th...

AI Technical Summary

Problems solved by technology

However, due to the complex structure of the brake system in the hydraulic system itself, the long assembly process and the slow response speed of the brake, such as emergency braking, due to the slow response speed of the hydraulic brake, it is still easy to cause the car to fail to brake. , and then accidents occur, affecting driving safety

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