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Automotive Engineering ›› 2022, Vol. 44 ›› Issue (5): 747-755.doi: 10.19562/j.chinasae.qcgc.2022.05.012

Special Issue: 底盘&动力学&整车性能专题2022年

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Study on the Backstepping Control Algorithm for the Hydraulic Pressure in Electro-hydraulic Brake-by-wire System

Qin Shi,Xin Liu,Helie Ying,Mingwei Wang,Zejia He,Lin He()   

  1. 1.School of Automobile and Traffic Engineering,Hefei University of Technology,Hefei  230009
    2.Laboratory of Automotive Intelligence and Electrification,Hefei University of Technology,Hefei  230009
  • Received:2021-08-17 Revised:2021-11-27 Online:2022-05-25 Published:2022-05-27
  • Contact: Lin He E-mail:helin@hfut.edu.cn

Abstract:

In order to realize the accurate control of hydraulic pressure in brake-by-wire system, a new type of brake-by-wire system is developed in this paper. A control-oriented dynamics model of system is established through system dynamics analysis, and a backstepping control algorithm is designed based on that system model. A radial basis function network is used to approximate the characteristics of continuous function and estimate the non-linear friction, related to system state variables, as the compensation for backstepping controller, with the Lyapunov stability of the algorithm proved. An electro-hydraulic brake-by-wire test bench is built to conduct tests on several braking conditions and the results show that the control strategy designed can achieve the accurate control of hydraulic pressure in brake-by-wire system with fast response.

Key words: brake-by-wire, hydraulic pressure control, backstepping control, RBF neural network, Lyapunov stability