Vehicle braking control method and device and drive-by-wire power-assisted braking system

Abstract

The invention relates to the technical field of vehicles, and provides a vehicle braking control method and device and a drive-by-wire power-assisted braking system. The method disclosed by the invention is applied to a vehicle with a drive-by-wire power-assisted braking system; the method comprises the steps that when a driver steps on a brake pedal and keeps the position of the brake pedal unchanged when a vehicle is static, a wire-controlled power-assisted braking system is controlled to enter a first power-assisted keeping stage, and in the first power-assisted keeping stage, the braking pressure and the motor torque of the wire-controlled power-assisted braking system are kept unchanged; and when the duration of the first power-assisted keeping stage exceeds a preset time threshold value, the wire-controlled power-assisted braking system is controlled to enter a second power-assisted keeping stage, in the second power-assisted keeping stage, the motor torque of the wire-controlledpower-assisted braking system is kept unchanged after being reduced, and the reduced motor torque can enable the braking pressure to be kept unchanged. The pedal feeling of a driver is kept unchangedby keeping the braking pressure of the braking system, and motor heating is reduced by reducing the motor torque of the braking system.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a vehicle braking control method, device and wire-controlled power-assisted braking system. Background technique [0002] With the development of electrification and intelligence of vehicles, new requirements are constantly put forward for the braking system. Correspondingly, the power-by-wire braking system, including electro-hydraulic power-by-wire braking system, EMB (Electro-Mechanical Brake) braking system and hybrid power-by-wire braking system, will gradually replace the traditional vacuum booster and become the future The direction of brake system development. The design of the existing power-by-wire braking system includes a motor and an ECU (Electronic Control Unit, electronic control unit). When the driver steps on the brake pedal for a long time, the motor output torque of the braking system is required to provide braking pressure. When the motor is in a locked-rot...

AI Technical Summary

Problems solved by technology

[0009] In view of this, the present invention aims to propose a vehicle braking control method, device, and power-by-wire braking system to solve the problem of motor heating caused by power generation for a long time after the motor is locked.

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