A braking system with variable pedal displacement-braking force characteristics and its control method

Abstract

The invention discloses a brake system with variable pedal displacement-braking force characteristics and a control method thereof, comprising a base, a first power assist adjustment device, a second power assist adjustment device, a pedal mechanism, a brake master cylinder, a fuel tank, and a pedal displacement Transducers, pressure transducers, hydraulic control units and electronic control units. The invention can freely design the feeling of the brake pedal for various braking conditions; it has an active braking function and can integrate active control technologies such as regenerative energy recovery, electronic stability program (ESP), adaptive cruise control (ACC), etc., to realize vehicle Intelligent control; in addition, the present invention also increases the redundancy of the failure backup mode and improves the braking safety.

Description

technical field [0001] The invention relates to the technical field of automobile braking, in particular to a braking system with variable pedal displacement-braking force characteristics and a control method thereof. Background technique [0002] The hydraulic braking system has the characteristics of high reliability and wide application. However, due to the disadvantages of the traditional hydraulic braking system using vacuum boosting, such as strong hysteresis, slow pressure build-up, and direct interaction with the pedal force, it is not conducive to the active control of intelligent driving. For example, it is not compatible with regenerative braking and brake pedal feel, and cannot meet the safety requirements of automatic emergency braking to quickly establish brake hydraulic pressure, etc. As electronization and electrification have gradually become the dominant trend in the development of industrial machinery, more and more electric braking systems have begun to a...

AI Technical Summary

Problems solved by technology

The brake-by-wire method uses the pedal feeling simulator to achieve decoupling, but the pedal feel is different from the real braking state; some braking systems select the driver's pedal force and motor power to couple through the feedback disc, and use the displacement difference sensor to collect feedback inside and outside the disc The control algorithm is relatively complicated to control the size of the booster by changing the ring shape; other booster systems that only use springs and hydraulic chamber compensation to control the pedal force are not ideal in practical application, because when the master cylinder is directly connected to the feedback compensation chamber through the oil circuit , the purpose of pedal feel and hydraulic coordination with regenerative braking cannot be achieved at the same time

In addition, in the working mode of failure backup such as motor failure, the pedal needs to directly push the master cylinder to brake, and the establishment of hydraulic pressure is very limited. Some systems with power assist only use the power ratio formed by the diameter difference between the wheel cylinder and the master cylinder

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