Dual-motor drive-by-wire pressure sequence adjusting brake system

Abstract

The invention discloses a dual-motor drive-by-wire pressure sequence adjusting brake system. Two motors are used for driving a ball screw assembly to push two high pressure cavities of a brake master cylinder to internally generate brake pressure. The system is provided with only four electromagnetic valves. The electromagnetic valves are arranged in pairs to be communicated with the two high pressure cavities of the brake master cylinder respectively, and therefore wheel cylinder pressure is adjusted. For brake wheel cylinders needing pressure decreasing or increasing, the normally open electromagnetic valves connected with brake wheel cylinders not needing pressure decreasing or increasing are closed. A motor control unit is used for controlling a second motor to rotate in reverse direction or forward direction. When the pressure of the brake wheel cylinders needing pressure decreasing or increasing is decreased or increased to a preset value, the normally open electromagnetic valves connected with the brake wheel cylinders needing pressure decreasing or increasing are closed, and brake wheel cylinder pressure decreasing or increasing is achieved. The dual-motor drive-by-wire pressure sequence adjusting brake system has the advantages that various functions such as ABS, TCS and ESP are integrated, a traditional ABS pressure adjusting unit is simplified, and the wheel cylinder pressure can be adjusted only through the four electromagnetic valves.

Description

technical field [0001] The invention relates to a brake-by-wire system, in particular to a pressure-sequence-adjusted brake system controlled by wire with two motors. Background technique [0002] Safety, energy saving and environmental protection are the inevitable trend of the development of automobile technology, and the development of these technologies puts forward new requirements for the braking system. For the traditional hydraulic braking system, one is that it cannot implement active braking, and it is difficult to meet the requirements of chassis control systems such as electronic braking force distribution and electronic stability programs that require active braking functions; Existence, thus hindering the braking energy recovery of new energy vehicles; Third, new energy vehicles do not have a vacuum source. For the vacuum booster braking system, an additional vacuum source is required, resulting in high cost. For the hydraulic booster braking system, high press...

AI Technical Summary

Problems solved by technology

However, the electro-hydraulic brake system and the electro-mechanical brake system are the two main forms of the brake-by-wire system, the structure is not compact enough, it takes up a lot of layout space, and failure protection is not considered

[0004] In the invention patent "Motor Assisted Integrated Vehicle Braking System" with the publication number CN102795219A, the system has high requirements on the performance of the motor, which increases the system cost, and it is difficult to adjust the pressure sequence of the four brake wheel cylinders with a single motor

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