Electro-hydraulic servo brake system with multi-working modes

Abstract

The invention discloses an electro-hydraulic servo brake system with multi-working modes. The electro-hydraulic servo brake system comprises a brake pedal, a manpower cylinder, an electro-hydraulic servo cylinder, a brake master cylinder, a liquid storage pot, a master cylinder pressure sensor, a hydraulic pressure control unit, a wheel cylinder, a motor, an electronic control unit and a brake pedal stroke sensor. The piston of the brake master cylinder is acted on through independence or overlaying of the electro-hydraulic servo cylinder and the manpower cylinder, and all or part of vehicle wheels are applied with brake. The electro-hydraulic servo brake system with the multi-working modes can work in an active brake mode, a line control mode and an assisted brake mode according to different brake requirements and has a backup manual braking function upon failure. The electro-hydraulic servo brake system has the advantages of the multi-working modes, the most suitable brake mode can be selected according to brake requirements in practical application, and high reliability and high failure protection capability are achieved.

Description

technical field [0001] The invention belongs to the technical field of automobile brake systems, and specifically relates to an electro-hydraulic servo brake system with multiple working modes. Background technique [0002] Automobile braking system is closely related to automobile driving safety. In addition to the traditional vacuum-assisted and electric-assisted servo braking systems and the anti-lock braking system (ABS) developed on their basis, new types of braking systems that have attracted attention in recent years include brake-by-wire systems, Such as electrohydraulic brake system (EHB) and electromechanical brake system (EMB). The brake-by-wire system can flexibly coordinate friction braking and regenerative braking, and can also conveniently realize active braking (the so-called "active braking" refers to the braking of some or all wheels without depressing the brake pedal. brake applied). The brake-by-wire system is superior to the traditional hydraulic brak...

AI Technical Summary

Problems solved by technology

The disadvantage of this dual-motor solution is that the two braking circuits are independent of each other, and the flexibility of the system control is poor, that is, it cannot be guaranteed that one can always be selected that is compatible with the dynamic performance of the motor when implementing the application and can exert the best performance of the system. control mode

For example, if the dynamic performance of the motor cannot meet the application of the multi-channel multiplexing method under the process material and cost control conditions during the implementation of the application, the system cannot achieve the pressure adjustment target that meets the braking requirements

In addition, the system's failure backup mechanism has a complex structure

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