Title: Dual-mode switched control of suspension with consideration of actuator dynamics

Authors: Bing Zhou; Xiaojian Wu; Guilin Wen; Yitong Song; Lefei Long

Addresses: State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China ' State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China ' State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China ' State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China ' State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China

Abstract: This work developed a dual-mode switched active control suspension to improve ride comfort and enhance anti-roll performance. First, a 4-DOF roll-plane half-car model, with consideration of the non-linear characteristics of hydraulic actuator, was employed for the study. On the basis of the backstepping algorithm, the controller was designed with two states corresponding to ride comfort control and anti-roll control. Accordingly, the controller can switch between the active suspension system (ASS) mode and the active hydraulically interconnected suspension (AHIS) mode. Subsequently, a trajectory planning function for the body roll angle was adopted to ensure a smooth switching process and desired value tracking. To estimate the critical states required for the control algorithm, the authors applied state observation based on the unscented Kalman filter (UKF). Then, simulation and road testing were undertaken to evaluate the performance of the UKF-based observation. Finally, numerical simulations, including step input and the fishhook test, were carried out to illustrate the effectiveness of the presented approach.

Keywords: active suspension system; ASS; active hydraulically interconnected suspension; AHIS; ride comfort; anti-roll; switched control; actuator dynamics; state observation.

DOI: 10.1504/IJVD.2017.085453

International Journal of Vehicle Design, 2017 Vol.74 No.2, pp.106 - 133

Received: 20 Feb 2016
Accepted: 07 Mar 2017
Published online: 26 Jul 2017 *

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