Hybrid braking system of electric wheel automobile and control method thereof

Abstract

The invention discloses a hybrid braking system of an electric wheel automobile and a control method thereof. The invention relates to the field of electric automobile brake systems. According to thehybrid braking system of the electric wheel automobile, on the premise that safety is guaranteed and the general braking function requirement of the electric automobile is met, the structure is simplified. The hybrid braking system comprises a hydraulic braking subsystem and a motor braking subsystem. The hydraulic brake subsystem comprises an oil storage cup, a brake pedal mechanism, a brake master cylinder, a pedal simulator, a public pipeline, a right brake wheel cylinder and a left brake wheel cylinder. The motor braking subsystem comprises a control unit and a pair of driving motors connected to the pair of driving wheels, the pair of driving motors are controlled through the control unit, and therefore the driving force and the braking force of the pair of driving wheels are adjusted. According to the system, the maximum total brake pressure requirement can be ensured. And the brake pedal feelings can be ensured to be consistent under different brake modes such as low-adhesion road surfaces, high-speed vehicle conditions and medium-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.

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