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

Abstract

The invention discloses an auxiliary braking system and control method of an electric automobile and the electric automobile. The system comprises an automobile speed detecting device, a braking pedal opening degree detecting device, a wheel motor braking device and a whole automobile controller, wherein the wheel motor braking device comprises a wheel braking motor and is used for applying braking force to a wheel when receiving a regenerative braking signal so as to conduct regenerative braking on the automobile; and when the automobile speed is larger than a predetermined automobile speed, the whole automobile controller determines the acceleration of stepping a braking pedal according to the change of the opening degree of the braking pedal and the change time, determines braking torque according to the automobile speed, the wheel rotating speed and the predetermined tire slip rate when the acceleration is larger than a predetermined acceleration and generates the regenerative braking signal according to the braking torque. The auxiliary braking system has the advantages of high braking response speed and short braking distance, and accordingly automobile safety can be guaranteed; and in addition, the auxiliary braking system has the advantages of simple structure and low cost.

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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