Title: An adaptive LQG control for semi-active suspension systems

Authors: Hyun-Chul Sohn, Kyung-Tae Hong, Keum-Shik Hong, Wan-Suk Yoo

Addresses: Department of Mechanical and Intelligent Systems Engineering, Pusan National University, San 30 Jangjeon dong, Kumjeong-ku, Busan, 609-735, Korea. ' Department of Mechanical and Intelligent Systems Engineering, Pusan National University, San 30 Jangjeon dong, Kumjeong-ku, Busan, 609-735, Korea. ' School of Mechanical Engineering, Pusan National University, San 30 Jangjeon-dong, Kumjeong-ku, Busan 609-735, Korea. ' School of Mechanical Engineering, Pusan National University, San 30 Jangjeon-dong, Kumjeong-ku, Busan 609-735, Korea

Abstract: In this paper, a road-adaptive LQG control for the semi-active Macpherson strut suspension system of hydraulic type is investigated. A new control-oriented model, which incorporates the rotational motion of the unsprung mass, is introduced. A semi-active suspension controller adapting to road variations is proposed. First, based on the extended least squares estimation algorithm, a LQG controller adapting to the estimated road characteristics is designed. Through the computer simulations, the performance of the proposed semi-active suspension is compared with that of a non-adaptive one. The results show better control performance of the proposed system over the compared one.

Keywords: Macpherson strut suspension; semi-active suspension; road variations; identification; LQG control.

DOI: 10.1504/IJVD.2004.004060

International Journal of Vehicle Design, 2004 Vol.34 No.4, pp.309 - 326

Published online: 10 May 2004 *

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