Title: Grey-fuzzy control for active suspension design

Authors: Jyh-Horng Chou, Shinn-Horng Chen, Feng-Zhi Lee

Addresses: Professor of Mechanical Engineering Department, National Yunlin University of Science and Technology, Touliu, Yunlin 640, Taiwan, Republic of China. ' Associate Professor of Mechanical Engineering Department, National Kaohsiung Institute of Technology, Kaohsiung 807, Taiwan, Republic of China. ' Graduate Student of Mechanical Engineering Department, National Yunlin University of Science and Technology, Touliu, Yunlin 640, Taiwan, Republic of China

Abstract: This paper presents a new control scheme for designing the active suspension system. The new control scheme proposed in this paper is named as the grey-fuzzy control method. The grey-fuzzy control scheme consists of two parts: the grey predictors and the fuzzy logic controller. The grey-fuzzy control method not only can attenuate the excessive tyre deflection, but also can regulate the motion of the sprung mass to move along a horizontal line for providing the better ride quality. When we use the grey-fuzzy control scheme to design the active suspension system, it is necessary to adjust the control parameters of both the grey predictors and the fuzzy controller (i.e., the sample sizes of the grey predictors and the scaling factors of the fuzzy controller). Therefore, in order to search for the optimal control parameters by way of systematic reasoning, Taguchi method is also applied in this paper to search for the near optimal control parameters of both the grey predictors and the fuzzy controller. Computer simulations are performed to verify the effectiveness by the above grey-fuzzy control scheme. It is shown the satisfactory performances have been achieved by such grey-fuzzy control scheme.

Keywords: active suspension; computer simulation; control law; grey fuzzy control; Taguchi methods; tyre deflection; suspension design; vehicle design; fuzzy logic; grey predictors.

DOI: 10.1504/IJVD.1998.062095

International Journal of Vehicle Design, 1998 Vol.19 No.1, pp.65 - 77

Published online: 29 May 2014 *

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