Title: Integrated control of automotive electrical power steering and active suspension systems based on random sub-optimal control

Authors: Wuwei Chen, Hansong Xiao, Liqiang Liu, Jean W. Zu

Addresses: School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei, China. ' Department of Mechanical and Industrial Engineering, University of Toronto, Toronto M5S 3G8, Canada. ' School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei, China. ' Department of Mechanical and Industrial Engineering, University of Toronto, Toronto M5S 3G8, Canada

Abstract: This paper addresses the problem of integrated control of electrical power steering systems (EPS) and active suspension systems (ASS). Through integrating EPS with ASS, a full car dynamic model is established. Based on the integrated model, a random sub-optimal control strategy based on output feedback is designed to fulfil the integrated control of both EPS and ASS. The characteristics of the integrated control system are analysed using Matlab/Simulink and a series of comparisons are made with the system without control and the ASS-only/EPS-only system. The simulation results show that the integrated control scheme can not only enhance the steering quality, but also significantly isolate the road excitation. Moreover, the integrated control system has a great improvement on anti-roll and anti-pitch abilities. The proposed research provides a theoretical solution for simultaneously improving the multiple vehicle performance indices including manoeuvrability, handling stability, ride comfort, and safety.

Keywords: active suspension systems; electrical power steering; EPS; full car dynamic model; integrated control; vehicle design; vehicle control; random sub-optimal control; simulation; steering quality; road excitation; vehicle performance; manoeuvrability; handling stability; ride comfort; safety.

DOI: 10.1504/IJVD.2006.010438

International Journal of Vehicle Design, 2006 Vol.42 No.3/4, pp.370 - 391

Available online: 21 Jul 2006

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