Braking control method and braking control system of vehicle

Abstract

The invention provides a braking control method of a vehicle. The vehicle comprises a motor and a mechanical braking mechanism. The method comprises the following steps of outputting the motor braking torque by the motor to brake the vehicle; in the process of braking, obtaining a wheel slip rate according to a speed signal and a wheel rotation speed signal; judging whether the wheel slip rate is within a preset range; if the wheel slip rate is not within the preset range, further judging whether the wheel slip rate is less than the lower limit of the preset range; if the wheel slip rate is less than the lower limit of the preset range, judging whether to increase the motor braking torque or combine with the mechanical braking mechanism to brake the vehicle to shorten the braking distance of the vehicle according to the motor braking torque and expected braking torque. By applying the method, the braking distance can be shortened to the maximum, and locking and slipping of wheels are avoided, so that the braking safety of the vehicle is improved. The invention also provides a braking control system of the vehicle.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a vehicle braking control method and system. Background technique [0002] When an electric vehicle performs emergency braking on an icy and snowy road, the electric vehicle is prone to wheel locking and loss of direction control, resulting in a collision accident. [0003] At present, the existing solution is to equip the whole vehicle with an ABS anti-lock braking system. This technical solution is to send a signal that the wheel will be locked through the sensor installed on the wheel, and the controller instructs the regulator to lower the wheel brake cylinder. Increase the oil pressure, reduce the braking torque, and then restore the original oil pressure after a certain period of time, and continue this cycle (up to 5 to 10 times per second), thereby preventing the wheel from completely locking. [0004] However, the ABS anti-lock braking system itself has...

AI Technical Summary

Problems solved by technology

[0004] However, the ABS anti-lock braking system itself has limitations

The ABS anti-lock braking system cannot provide the shortest braking distance. If the braking is too late, it will not be able to stop completely in front of the obstacle, and it still cannot prevent the accident from happening.

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