Jitter suppression of a pedal-coupled electric booster for improving its pedal foot feeling

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (18) : 221-227.

LIU Jingang1, XIAO Peijie1, FU Bing1,WANG Gaosheng1, CHEN Jianwen2

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Abstract

When the boosting motor of the pedal-coupled electric booster of an electro-hydraulic brake (EHB) system is under stall control, its torque pulsation easily causes the brake pedal to tremble, which is one of the main factors affecting the comfort of the driver’s pedal foot feeling.To this end, a system of "brushless DC motor + two-stage reducer + rack and pinion" was used as a power source to carry out the study the optimal control of pedal foot feeling.First, a methmatic model for the pedal-coupled electric booster was established.A jitter suppression method for improving the pedal foot feeling of the electric booster was proposed on the basis of analyzing the ideal pedal displacement and the pressure curve of the master cylinder.Then, Based on the three closed-loop control of the brushless DC motor, the technical solution of real-time compensation of the booster by regulating the motor rotation angle was adopted.The motor rotation angle compensation term was quantified, and a jitter suppression algorithm for the pedal foot feeling of the electric booster was designed.Finally, a simulation model of the booster was built on the MATLAB/Simulink platform, and the research results verified its feasibility.The simulation results show that the method can improve the brake pedal foot feeling and reduce the steady-state error of oil pressure in the brake master cylinder without adding any additional cost.

Key words

pedal-coupled / electric booster / pedal foot feeling / jitter suppression / rotation angle compensation

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LIU Jingang, XIAO Peijie, FU Bing,WANG Gaosheng, CHEN Jianwen. Jitter suppression of a pedal-coupled electric booster for improving its pedal foot feeling[J]. Journal of Vibration and Shock, 2021, 40(18): 221-227

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