Hybrid brake system and control method for electric wheel vehicle

Abstract

A hybrid braking system and a control method for an electric wheel vehicle. It relates to the field of electric vehicle braking system. A hybrid braking system for electric wheel vehicles with simplified structure is proposed under the premise of ensuring safety and meeting the general braking function requirements of electric vehicles. The hybrid braking system includes a hydraulic braking subsystem and a motor braking subsystem; the hydraulic braking subsystem includes an oil storage cup, a brake pedal mechanism, a brake master cylinder, a pedal simulator, a public pipeline, a right Brake wheel cylinder, left brake wheel cylinder; the motor brake subsystem includes a control unit and a pair of driving motors connected to a pair of driving wheels, and the control unit controls a pair of driving motors respectively, thereby respectively adjusting a pair of driving wheels driving force and braking force. The invention can guarantee the maximum total braking pressure requirement. It can ensure that the brake pedal feels consistent under different braking modes such as low-adhesion road surfaces, high-speed vehicle conditions, and medium and low-speed vehicle conditions.

Description

technical field [0001] The invention relates to the field of electric vehicle braking systems, in particular to the field of a distributed single-axis drive electric vehicle braking system and a braking method. Background technique [0002] The motion state and torque of each drive wheel of a distributed drive vehicle can be independently controlled without mechanical connection, which can not only improve the efficiency of the power system, reduce the quality of the vehicle, but also facilitate integrated control with the braking system. The traditional vacuum booster braking system does not meet the energy-saving requirements of modern electric vehicles. The wire-controlled hydraulic braking system uses an electric master cylinder or a high-pressure accumulator as a power source for braking. complex. A mechanical brake system by wire is the ideal final brake system form, but it will increase the unsprung mass and has no fail-safe backup, which does not meet the braking re...

AI Technical Summary

Problems solved by technology

Distributed drive vehicles take advantage of their independent control to perform electric vehicle stability control and energy-saving braking. Most of these studies are based on traditional hydraulic braking systems or wire-controlled hydraulic braking systems, without distributed drive systems and braking systems. The coupling design between them has problems such as control redundancy, system complexity and poor reliability.

Images