An electro-hydraulic composite braking system with electric power assist function and suitable for regenerative braking vehicles

Abstract

The invention discloses an electro-hydraulic combined braking system with the electric power function and applicable to a regenerative braking automobile. A braking pedal pushes a piston ejector rod of a braking master cylinder to move through a pedal push rod, and an electric braking power device assists in pushing the ejector rod of the braking master cylinder to move. The structure of combining a ball screw pair with a reacting disc is adopted for the electric braking power device, and therefore the torque output by rotation of a motor can be converted into linear movement of an output rod. In the braking process, the movement of the piston ejector rod of the braking master cylinder can be braked by controlling rotation of the motor. According to received collection signals of all sensors on the automobile, an electronic control unit controls a hydraulic control system and the electric braking power device and selects one braking mode, and the braking modes include the electric power mode, the regenerative braking mode, and the driving braking mode. The electro-hydraulic combined braking system has the advantages of having the electric braking power and driving braking functions, and being high in reliability, low in manufacturing cost, small in pressure fluctuation and high in pressure adjusting accuracy.

Description

technical field [0001] The invention belongs to the technical field of automobile braking systems, and specifically relates to an electro-hydraulic composite braking system which has an electric power boosting function and is suitable for regenerative braking automobiles. Background technique [0002] As the core safety component of automobiles, the braking system has undergone several major changes and improvements. From the initial leather friction brakes to drum and disc brakes, to vacuum boosters, electric power boosters, anti-lock brake systems (ABS) and brake pedals used to reduce pressure adjustment when ABS intervenes Rebound center valve brake master cylinder etc. In recent years, the development of brake-by-wire systems (Brake-by-wire), such as electro-hydraulic brakes (EHB) and electro-mechanical brakes (EMB), has sprung up. [0003] At present, most automobile hydraulic braking systems use vacuum power assist, and a few cars use other forms of power assist devi...

AI Technical Summary

Problems solved by technology

Although all kinds of brake-by-wire systems have many advantages as mentioned above, they also have some disadvantages compared with non-wire-control systems: special failure backup devices need to be set up, which increases the complexity and cost of the system; Under certain conditions, the pedal force is always generated by the pedal stroke simulator, and the pedal force cannot be adjusted; the manpower applied to the brake pedal is not directly used to generate braking force, which is not conducive to shortening the brake action time

The electro-hydraulic composite braking system of the present invention overcomes two obvious deficiencies of the traditional power-assisted braking system: one is that active braking cannot be conveniently implemented; the other is that as long as the driver steps on the brake pedal, the friction brake will participate in generating braking force

The first deficiency of the power-assisted braking system makes it unable to meet the active braking needs of chassis active control systems such as anti-skid control (ASR), electronic stability control (ESC) and adaptive cruise control (ACC)

Although ESC vehicles equipped with ASR and differential pressure braking can implement active braking through the hydraulic control unit 31 of these active control systems, the pressure build-up time is relatively long, and because the electromagnetic valve is not suitable for long-term continuous work, it is difficult Meet the active supercharging needs of ACC and other control systems

The second deficiency of the booster braking system seriously hinders the braking energy recovery of new energy vehicles such as electric vehicles and hybrid vehicles

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