Brake-by-wire device and control method with redundant function

Abstract

The invention relates to a brake-by-wire device with redundant functions and a control method, including a brake disc, a caliper, a power take-off gear, a gear shaft, a screw shaft, an electromagnetic clutch, a nut assembly, a return motor, a motor bracket, and a bracket , brake cylinder, right friction plate, left friction plate, first two-position two-way solenoid valve, second two-position two-way solenoid valve, vehicle speed sensor, controller, gear position sensor; the present invention can make full use of vehicle kinetic energy as power source, cancel the driving motor used in the prior art, effectively reduce the cost; use the gear power take-off mechanism to drive the executive structure to generate the braking force, and control the braking force of the brake through the electromagnetic clutch; through the coupling with the conventional hydraulic braking system, the redundancy is realized. It has the advantages of high integration, fast response, and low cost; when the brake lock occurs in the vehicle, the switching control mode of the hydraulic brake is changed to the continuously adjustable braking force mode, which has higher control accuracy.

Description

technical field [0001] The invention relates to the field of automobile brakes, in particular to a brake-by-wire device with redundant functions and a control method. Background technique [0002] Brake-by-wire technology is a new type of braking technology that has emerged in recent years. It does not rely on mechanical or hydraulic connections between the brake and the brake pedal. It uses wires to replace part or all of the brake pipelines, and controls the electronic control through the controller. The components are used to control the braking force and realize the stable and reliable braking control of the car. At present, the brake-by-wire system mainly includes two types: electro-hydraulic brake system (EHB) and electro-mechanical brake system (EMB). The brake-by-wire system is conducive to the optimization of the braking performance of the whole vehicle, and can be easily integrated with other electronic control systems such as ABS, ASR, ESP, etc., so it has a broa...

AI Technical Summary

Problems solved by technology

[0005] Although the existing electronic hydraulic brake system (EHB) uses an electronic brake pedal, its brake pressure is provided by a plunger pump driven by a motor, and a high-pressure accumulator is used to store pressure, and the backup brake system More isolation solenoid valves are used in the system, so that the whole system has more parts and higher cost

In addition, in the existing braking system, the master cylinder and the pressure regulating unit are not integrated, the degree of modularization is not high, the length of the brake pipeline is increased, and the brake pressure response is slow

Since the brake pipeline will undergo elastic deformation under the action of high-pressure brake fluid, the pressure of the brake fluid in the brake pipeline will fluctuate, which will greatly affect the precise control of vehicle braking.

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