Dual-motor BBW (brake-by-wire) system with multiple working modes and voltage regulation modes

Abstract

The invention discloses a dual-motor BBW system with multiple working modes and voltage regulation modes. A brake fluid in a manual cylinder flows into two main cylinders by means of a brake pedal, and brake pressure is generated; and meanwhile, output power torque of two motors is controlled, and axial thrust is overlaid to pistons of the two main cylinders through a transmission device, so that electric power brake is realized. Through control of output torque of the two motors, pressure of the two main cylinders is transmitted to wheel cylinders, brake by wire is realized, and a pedal travel simulator is used for providing force for the brake pedal. Under the condition that the brake pedal is not stepped, the output torque of the two motors is controlled, so that the two cylinders generate pressure which is transmitted to the wheel cylinders through a hydraulic control unit, and accordingly, the active brake is realized. The invention further discloses a structure of a hydraulic control system, and the structure has multiple voltage regulation modes. The dual-motor BBW system has the advantages as follows: the system has multiple braking modes and voltage regulation modes, the most appropriate braking mode and voltage regulation mode can be selected according to dynamic properties of the motors during implementation and application, the reliability is high, and the failure protection capacity is high.

Description

technical field [0001] The invention belongs to the technical field of automobile braking systems, and specifically relates to a dual-motor wire-controlled braking system with multiple working modes and voltage regulation modes. Background technique [0002] Automobile braking system is closely related to the safety of the automobile. 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 1). brake applied). The brake-by-wire system is s...

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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