Title: Precise pressure adjustment of electro-hydraulic brake system based on pressure-position cascade control and compensation

Authors: Yiping Liu; Xiaofei Pei; Xuexun Guo; Shihao Zhen; Zhiwei Sun

Addresses: Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430053, China ' Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430053, China ' Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430053, China ' Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430053, China ' Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430053, China

Abstract: A control architecture consisting of feedforward compensation, friction compensation, pressure outer loop, and position inner loop is proposed for pressure control of an electro-hydraulic brake system (EHB). The pressure and position loops are cascaded to take full advantage of the accuracy of the pressure feedback and the rapidity of the position feedback. To ensure the tracking accuracy of the master cylinder pressure and actuator position, both the inner and outer loops are designed as adaptive sliding mode controllers according to the nonlinear model. Based on the cascade architecture, an online friction compensation module is constructed using motor speed and position to improve the tracking accuracy of the inner-loop controller. The feedforward compensation module is used to improve the pressure response speed and reduce the adjustment burden of the pressure outer loop. The test results show that the control strategy can achieve accurate pressure-position tracking and has excellent fault tolerance performance.

Keywords: EHB; electro-hydraulic brake system; adaptive sliding mode; cascade control; friction compensation; feedforward compensation; fault tolerance.

DOI: 10.1504/IJVD.2023.135834

International Journal of Vehicle Design, 2023 Vol.93 No.4, pp.332 - 361

Received: 18 Jul 2022
Received in revised form: 09 Feb 2023
Accepted: 21 Mar 2023
Published online: 08 Jan 2024 *

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