Vehicle brake-by-wire system and braking method thereof

Abstract

The invention discloses a vehicle brake-by-wire system and a braking method thereof. The system comprises: an electric cylinder servo assembly which is used for conveying brake fluid to a hydraulic control unit according to an operation instruction to establish required brake pressure; a pedal simulation unit used for detecting the displacement of a pedal to simulate the brake pedal feeling and conveying brake fluid to the hydraulic control unit according to the operation instruction so as to realize manual backup braking; a hydraulic control unit used for providing brake pressure for each brake wheel cylinder according to the brake instruction; a first controller used for detecting and selecting a braking mode and sending an operation instruction to the electric servo cylinder assembly and the pedal simulation unit; and a second controller used for sending a braking instruction to the hydraulic control unit, and electrically connected with the hydraulic control unit. The brake-by-wire system has the functions of brake-by-wire and active braking, has high reliability of a traditional brake-by-wire system, can simulate pedal feeling, and also has the active braking function of an intelligent automobile; and the pressure is easy to control, and the pressure adjusting precision is high.

Description

technical field [0001] The invention belongs to the technical field of braking systems, in particular to a vehicle-by-wire braking system and a braking method thereof. Background technique [0002] Automobiles have become an indispensable means of transportation for people to travel, and good braking performance is the primary guarantee for safe driving of automobiles. Conventional hydraulic braking systems are able to meet the braking needs of conventional internal combustion engine vehicles. However, with the continuous development and popularization of automobile electronics, intelligence and new energy vehicle technology, the traditional hydraulic braking system can no longer meet the development requirements of automobiles, and the development of new multifunctional hydraulic braking systems will face great challenges. [0003] At present, the smart cars on the market are mainly electric cars, and the active braking requirements of chassis active control systems such a...

AI Technical Summary

Problems solved by technology

However, with the continuous development and popularization of automotive electronics, intelligence, and new energy vehicle technology, the traditional hydraulic braking system can no longer meet the development requirements of automobiles, and the development of new multifunctional hydraulic braking systems will face great challenges.

[0003] At present, the smart cars on the market are mainly electric cars. The active braking requirements of chassis active control systems such as adaptive cruise control and electronic stability programs of smart cars, among them, active braking refers to when the driver does not step on the brake. In the case of pedals, all or part of the wheels can still be braked; the traditional hydraulic brake system is vacuum assisted, but there is no vacuum source on the smart car, and another vacuum source is needed to meet the functions of the traditional hydraulic brake system The demand makes it difficult for the traditional hydraulic braking system to implement active braking, which makes the structure of the braking system complex and the production cost is high. It is difficult to apply the traditional hydraulic braking system to smart cars, and it is impossible to realize the active braking function

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