Automobile composite braking system

Abstract

The invention relates to an automobile composite braking system, comprising a hydraulic braking subsystem and a motor braking subsystem, wherein the hydraulic braking subsystem is composed of a pedal brake valve, a pressure retention mechanism, a pressure regulating mechanism, an ABS / ESP hydraulic valve block and a braking controller; the P port of the pedal brake valve is connected with the oil circuit at the outlet of a high pressure accumulator, the T port thereof is connected with the oil circuit of a liquid storage pot, and the A port is connected with the oil circuit of the pressure regulating mechanism; the pressure regulating mechanism is connected with the ABS / ESP hydraulic valve block and the oil circuit of the liquid storage pot; the braking controller is connected with the pressure regulating mechanism, a braking pedal displacement sensor, a wheel speed sensor and a pressure sensor circuit on the oil circuit; and the motor braking subsystem is composed of a motor, a derailleur, a motor controller and batteries. The pressure regulating mechanism can be formed by a two-position two-way normally closed valve and a normally opened valve, and also can be an independent tri-way normally opened electro-hydraulic proportional valve. The motor braking subsystem is supplied with braking force from the hydraulic braking subsystem when braking force thereof is insufficient. The invention can be used in a hybrid electric vehicle, a pure electric vehicle and a fuel cell electric vehicle.

Description

technical field [0001] The invention relates to a braking system, in particular to an automobile composite braking system. Background technique [0002] At present, under the dual pressure of energy and the environment, new types of vehicles including hybrid electric vehicles, pure electric vehicles and fuel cell vehicles have gradually emerged. This type of car has a motor and a battery or a super capacitor, so when braking, the motor can convert the kinetic energy of the car into electrical energy and store it in the battery or super capacitor. But generally speaking, the regenerative braking torque provided by the motor cannot meet the needs of automobile braking, so this type of automobile still retains the original hydraulic braking system or pneumatic braking system, so the hydraulic braking system or The air brake system and the motor brake system work at the same time, and the combination of the two is called the compound brake system here. The compound braking sys...

AI Technical Summary

Problems solved by technology

In the technical solution of this patent, the two outlets of the brake master cylinder directly communicate with the brake wheel cylinder through the oil inlet valve of the ABS hydraulic valve block, so when adjusting the braking pressure of the brake wheel cylinder during the braking energy recovery process , will cause large fluctuations in the pressure of the brake master cylinder, which will cause severe vibration of the brake pedal and affect the feeling of the pedal

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