Distributed type electronic hydraulic brake system using isolating valves

Abstract

The invention relates to a distributed type electronic hydraulic brake system using isolating valves and belongs to the field of active safety of automobiles. The distributed type electronic hydraulic brake system comprises four brake actuating mechanisms, four brakes, two isolating valves, four actuating mechanism controllers, a brake pedal, one pedal sensor, a line control brake controller, a bus and a brake pipeline. Each brake actuating mechanism is composed of a motor and a hydraulic cylinder. Each hydraulic cylinder is provided with two oil outlets, one of the two oil outlets is connected with the brakes, and the other oil outlet is connected with the isolating valves. One of the two isolating valves is used for being connected with the brake actuating mechanisms of two front wheels, and the other isolating valve is used for being connected with the brake actuating mechanisms of two rear wheels. The distributed type electronic hydraulic brake system using the isolating valves can improve reliability.

Description

technical field [0001] The invention relates to a distributed electronic hydraulic braking system using an isolation valve, which belongs to the field of automobile active safety. Background technique [0002] Automotive brake-by-wire systems have very high reliability requirements, and technical means such as hardware and software redundancy design, fault diagnosis, and fault-tolerant control are usually used to enhance system reliability. For distributed brake-by-wire systems, redundant design is usually carried out for power supply, pedal sensor, bus, electronic control unit, etc., and system reliability is improved through redundant software and hardware backup. Executing agencies for redundancy design. In this way, there is a problem: for the distributed brake-by-wire system, when a brake actuator fails during the braking process (that is, the brake actuator cannot generate braking force, or can only produce a small unsatisfactory required braking force), if the brake...

AI Technical Summary

Problems solved by technology

In this way, there is a problem: for the distributed brake-by-wire system, when a brake actuator fails during the braking process (that is, the brake actuator cannot generate braking force, or can only produce a small unsatisfactory required braking force), if the brake actuator is allowed to fail, it may lead to insufficient overall braking force of the vehicle and affect the braking performance, and at the same time cause the braking force on one side of the vehicle to be greater than the braking force on the other side, resulting in braking Running deviation and decreased braking stability

This method can basically guarantee the braking stability and braking efficiency in the case of low braking intensity and medium braking intensity, but may not meet the requirements of braking stability and braking efficiency in the case of high braking intensity , leading to the risk

[0003] The applicant once proposed a distributed brake-by-wire system: automotive electromechanical hydraulic brake system, the patent number is ZL200920110660.X, its structure is as follows figure 1 As shown, its disadvantage is that if a brake actuator fails during high-intensity braking, the redistribution of braking force by software control strategy alone may not meet the requirements of braking stability and braking efficiency. thereby causing the risk

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