Dual-redundancy full-decoupling brake-by-wire system

Abstract

The invention discloses a dual-redundancy fully-decoupling brake-by-wire system. The system comprises: a brake pedal; a foot feeling simulator which is used for providing braking force and damping simulation; a redundant pedal travel sensor which is used for sensing a travel signal of the brake pedal when a driver brakes; a liquid storage tank; four brake wheel cylinders which are used for braking four wheels; a hydraulic source which comprises a main motor and an auxiliary motor, wherein the main motor and the auxiliary motor are controlled to brake according to different brake modes; and a controller which is used for converting the stroke signal of the brake pedal into a motor execution instruction and controlling a motor of the hydraulic source to output corresponding hydraulic pressure according to the motor execution instruction. The system can achieve undifferentiated redundant braking safety, and when the main motor fails, the backup motor can be immediately taken over; and under the condition that liquid supplementing is needed, the liquid supplementing mode can be started, and the double motors act simultaneously, so that the driving torque is increased, and the liquid supplementing time is shortened.

Description

technical field [0001] The present application relates to the technical field of automobile control, in particular to a dual-redundant fully decoupled brake-by-wire system. Background technique [0002] Automobile braking system is the direct device to realize the braking control of automobile, and plays a vital role in the stability and safety of automobile. With the continuous development of autonomous driving technology, it is possible to realize the active safety of automobiles. There is an urgent need for a braking system that can decouple from the driver and realize active braking. And the requirements for control precision and response time are getting higher and higher. [0003] Existing solution: full decoupling brake. Bosch, Continental, ZF, TRW and other companies have related products. like figure 1 As shown, the scheme integrates active braking and stability control in a fully decoupled brake, and realizes the complete decoupling of the driver and the brake ...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of this scheme are: 1) the degree of safety redundancy is low

Driving becomes more difficult and dangerous for less powerful drivers

2) The brake fluid reserve of the brake master cylinder is limited, and it is easy to cause insufficient fluid replenishment during ABS and other control periods that require rapid pressure reduction and pressure increase

The existing control method is very complicated and the time interval is long, which affects the control effect of ABS

3) Due to the limitations of the volume of the master cylinder and the power / torque of the motor, the matching range of fully decoupled brake products is limited, and the versatility of different models is not high

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