Regenerative braking system based on ESC hardware and control method of regenerative braking system

Abstract

The invention discloses a regenerative braking system based on ESC hardware. The system comprises a brake pedal unit, a vacuum booster unit, a brake master cylinder unit, a hydraulic execution unit, four wheel cylinders, four wheel speed sensors, an ESC control unit, a vehicle control unit, a motor control unit and a battery control unit. The brake pedal feeling the same as that of a traditional hydraulic braking system can be guaranteed, no brake pedal travel simulator needs to be additionally mounted, when the ESC hardware fails, backup braking the same as that of the traditional hydraulic braking system can be provided, and the braking safety is guaranteed. Regenerative braking is finished through a drive motor, the hydraulic execution unit is used for finishing hydraulic braking, and a braking scheme which is low in cost and easy to implement and integrates regenerative braking and ESC is provided.

Description

technical field [0001] The invention relates to an integrated braking system of a pure electric vehicle, a hybrid vehicle and a fuel electric vehicle, in particular to a braking system based on ESC hardware and having a regenerative braking function. Background technique [0002] Regenerative braking is an important technology to improve the fuel economy of electric vehicles, hybrid electric vehicles and fuel cell vehicles. In order to achieve regenerative braking, the brake pedal force and brake fluid pressure need to be decoupled. In view of the above problems, the commonly used solutions can be divided into two types: one is to use brake-by-wire to redesign the braking system; the other is to modify the existing braking system. The first method will increase the difficulty and time of product development, thereby increasing risks and costs. The second method can be divided into regenerative braking system based on ABS hardware and regenerative braking system based on ES...

AI Technical Summary

Problems solved by technology

If regenerative braking is implemented directly based on ESC hardware, the regenerative braking force that changes at any time will be transmitted to the brake pedal through hydraulic braking force, affecting the braking feeling

In the existing regenerative braking system based on ESC hardware, in order to ensure a good brake pedal feel, it is often necessary to add a brake pedal stroke simulator or other components, which increases the manufacturing cost; in addition, when the ESC hardware fails, the front wheel Will lose hydraulic braking force, affecting braking safety

Invention patent CN101844518A discloses a regenerative braking system based on traditional ESC. This solution ensures a good brake pedal feel, but when the ESC hardware fails or power is lost, the front wheels will lose braking force, which will affect braking safety. , and the increase of the stroke simulator will increase the cost of the braking system; the invention patent CN104442767A discloses a regenerative braking system based on ESC hardware. Adding pedal simulators and additional hydraulic branches to each wheel not only increases the cost, but also increases the difficulty of development

Images