Hydraulic braking system for feedback of regenerated braking energy of electric vehicle

Abstract

The invention discloses a hydraulic braking system for feedback of regenerated braking energy of an electric vehicle, and relates to the hydraulic braking technology. A braking pedal (3) of the hydraulic braking system is connected with an input push rod of a vacuum booster (5), a main braking cylinder (9) is connected with an output push rod of the vacuum booster (5), a front cavity of the vacuum booster (5) is connected with an electric vacuum pump by a vacuum source connector (6), a front cavity of the main braking cylinder (9) is connected with a braking circuit A, a rear cavity of the main braking cylinder (9) is connected with a braking circuit B, the main braking cylinder (9) is connected with an oil storage cup (7), the front cavity of the main braking cylinder (9) and the braking circuit A are jointly connected with a main cylinder pressure sensor A (8), the rear cavity of the main braking cylinder (9) and the braking circuit B are jointly connected with a main cylinder pressure sensor B (40), and a pedal simulator A (12), a pedal simulator B (1), a pedal simulator isolating valve A (11), a pedal simulator isolating valve B (2), a regeneration braking switch valve A (10) and a regeneration braking switch valve B (4) are respectively added into a hydraulic circuit of an ABS (anti-lock brake system) to form the braking circuit A and the braking circuit B. The hydraulic braking system aims to realize that a driver can carry out braking operation in the traditional mode and keeps feeling good for the braking pedal, a hardware platform is provided for maximum feedback of the braking energy, and a fail-safe mode is provided.

Description

technical field [0001] The invention relates to a hydraulic braking system of an electric vehicle. It can be applied to the field of hydraulic braking systems for regenerative braking energy feedback of pure electric vehicles, hybrid vehicles, fuel cells and other clean vehicles. The application object of the present invention is a vehicle having a hydraulic brake system in the form of an X-type or front-rear brake pipeline arrangement. Background technique [0002] Regenerative braking energy feedback means that during the braking and coasting process of the car, the kinetic energy or potential energy originally consumed in the form of heat by the traditional friction braking system or the engine is converted into electrical energy by using motor braking. and storage process. As one of the key control technologies of electric vehicles, regenerative braking energy feedback can effectively improve the energy utilization efficiency of the vehicle, extend the driving range of...

AI Technical Summary

Problems solved by technology

[0004] If the regenerative braking energy feedback is based on the parallel hybrid braking hardware platform, the regenerative braking capability of the motor cannot be fully utilized due to the constraints of the braking safety regulations and the hydraulic system participates in the braking; Braking hardware platform, the driver's driving habits and pedal feel will have certain changes

If regenerative braking energy feedback is based on a hybrid braking hardware platform that is fully coupled with the brake master cylinder and the brake wheel cylinder, the pressure change of the brake wheel cylinder will affect the pressure change of the brake master cylinder and then affect the driver's braking. comfort of feeling

If the regenerative braking energy feedback is based on the hybrid series braking hardware platform, if its pressure regulating device cannot fine-tune the wheel cylinder pressure, it will be difficult to ensure the consistency and consistency of the braking strength during the electro-hydraulic hybrid braking process. Coordination of electro-hydraulic compound brake

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