Title: Variable ratio control strategy for a rear wheel active steering

Authors: Hao Qiu; Zhengbao Lei; Ziming Qi

Addresses: Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410004, China ' Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410004, China ' School of Architecture, Building and Engineering, Otago Polytechnic, Dunedin 9054, New Zealand

Abstract: This paper presents a variable ratio control strategy for a rear wheel active steering in order to improve the vehicle control stability and obtain an ideal steering characteristic. Considering the vehicle's control response performance at low speed and driving stability performance at high speed, using an expected yaw velocity with variable ratio and linear quadratic regulator (LQR) optimal control method, we design a vehicle rear wheel active steering controller to ensure the tracking at expected yaw velocity. The simulation result showed that the proposed control strategy has not only improved the control response at low speed but also enhanced the driving stability performance at high speed.

Keywords: 4WS; control stability; yaw velocity; active control; tracking control; variable ratio control; rear wheel steering; active steering; vehicle stability; linear quadratic regulator; LQR; optimal control; simulation; vehicle control; vehicle speed.

DOI: 10.1504/IJISTA.2014.068829

International Journal of Intelligent Systems Technologies and Applications, 2014 Vol.13 No.4, pp.267 - 279

Available online: 13 Apr 2015 *

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