ZHU Lingjun, YU Sunan, LIU Xiaofan, ZHAO Dingcheng

(School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)

 

Abstract: Aiming at the problems of robust performance in the vehicle steering by wire(SBW) system,the principle and structure of SBW were researched,then the simplified SBW model was built up .The SBW control system was analyzed and designed,which is based on H∞,using reverse method to avoid the choice of weighting function, by observing S / T singular value curve in the operation of the H∞, in line with the use of SBW robust performance as expected requirements rod S / T curve of the reversing loop system, the closed loop transfer function was constructed,then, a SBW based on an improved H∞ algorithm was advanced.The accuracy of an improved H∞algorithm control strategy was tested through the analysis of SBW in time and frequency domains and the the simulation result under the interference and parameter perturbation.The results indicate that the SBW based on an improved H∞algorithm has a stable robust performance,which has a better response performance,and the improved controller has a better robust performance than before.

Key words: steering by wire(SBW); robust; H∞ algorithm