Braking method and device of electric vehicle and electric vehicle

Abstract

The invention provides a braking method and device of an electric vehicle and the electric vehicle. The braking method is applied to the electric vehicle. A braking system of the electric vehicle comprises braking callipers of which the dragging torque is zero. The braking method comprises the following steps of judging whether opening degree of an accelerator pedal in the electric vehicle is 0 or not, and if yes, controlling a hydraulic system in the electric vehicle to exert pressure of a first threshold to the braking callipers, so as to enable the friction between the braking callipers and wheels of the electric vehicle to achieve a second threshold. According to the braking method disclosed by the invention, the braking callipers of which the dragging torque is zero are adopted, so that in the rotating process, the frictional resistance of the wheels is reduced, the life of a braking friction piece is prolonged, the energy sources are saved, and the endurance mileage of the battery is increased; and the safety of the electric vehicle is improved; and when the opening degree of the accelerator pedal is 0, the braking callipers are prepressed, so that the idle stroke of a braking pedal, the reacting time and the braking distance of the braking system are shortened, the feeling of a driver braking the pedal is improved, and the user experience is improved.

Description

technical field [0001] The present application relates to the field of new energy technology, in particular to an electric vehicle braking method and device, and the electric vehicle. Background technique [0002] At present, disc brakes are widely used in electric vehicle braking systems due to their advantages such as fast heat dissipation, light weight, convenient adjustment, good high temperature resistance under high load, and stable braking effect. [0003] The disc brake is mainly composed of brake disc, hydraulic cylinder, brake caliper, oil pipe, brake friction plate and other components. The brake disc is fixed on the wheel of the car and rotates with the wheel, and the hydraulic cylinder is fixed on the bracket of the brake. The moving friction plate is fixed on the bracket of the brake caliper. When the disc brake is used to oppose the brake control of the car, when the driver steps on the brake pedal, the braking force will be sent from the brake pedal and the ...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned electric vehicle braking method, the brake friction lining on the brake caliper is always in contact with the brake disc on the wheel of the automobile during the running of the automobile, which leads to the braking of the automobile when the automobile is in a non-braking situation. The friction between the moving friction plate and the brake disc will still produce heat, which will easily cause damage to the brake friction plate and waste energy, reduce the cruising range of the battery, and affect the driving safety of the car

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