Open Access

ARTICLE

Sliding Mode Control of Hydraulic Pressure in Electro-Hydraulic Brake System Based on the Linearization of Higher-Order Model

Qiping Chen^*, Haoyu Sun, Ning Wang, Zhi Niu, Rui Wan

Key Laboratory of Conveyance and Equipment Ministry of Education, East China Jiaotong University, Nanchang, 330013, China

* Corresponding Author: Qiping Chen. Email:

Fluid Dynamics & Materials Processing 2020, 16(3), 513-524. https://doi.org/10.32604/fdmp.2020.09375

Received 08 December 2019; Accepted 16 March 2020; Issue published 25 May 2020

Abstract

The possibility to enhance the stability and robustness of electrohydraulic brake (EHB) systems is considered a subject of great importance in the automotive field. In such a context, the present study focuses on an actuator with a four-way sliding valve and a hydraulic cylinder. A 4-order nonlinear mathematical model is introduced accordingly. Through the linearization of the feedback law of the high order EHB model, a sliding mode control method is proposed for the hydraulic pressure. The hydraulic pressure tracking controls are simulated and analyzed by MATLAB/Simulink soft considering separately different conditions, i.e., a sine wave, a square wave and a square wave with superimposed sine disturbance. The results show that the proposed strategy can track the target within 0.25 s, and the mean observed error is less than 1.2 bar. Moreover, with such a strategy, faster response and less overshoot are possible, which should be regarded as significant advantages.

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Citations