CONTROL OF AUTOMOTIVE SUSPENSIONS VIBRATION VIA MAGNETO RHEOLOGICAL DAMPER

Li Rui

(College of Automation, Chongqing University of Post and Telecom, Chongqing 400065)

Yu Miao  Chen Weimin  Liao Changrong  Dong Xiaomin

(College of Opto-Electric Engineeing, Chongqing University, Chongqing 400044)

Abstract: Characteristics of magneto-rheological(MR) damper are analysed. A hierarchical fuzzy controller, composing of control and coordination level, is proposed for vibration control of automotive MR suspensions. In the control level, based on a hybrid control strategy of sky-hook control and ground-hook control, a semi-active fuzzy logic controller is designed for each support MR suspension system. In the coordination level, a coordination controller is designed to coordinate the four independent semi-active fuzzy controllers by adjusting their output parameters according to the system feedback.To validate the real results of hierarchical fuzzy control, a MR semi-active suspensions control and test system is set up and implemented on a mini vehicle, which is equipped with four controllable MR dampers. Test results show that the vertical vibration can be effectively reduced and the ride comfort,road holding and hanlding stability of automotive vehicle can be improved by the hierachical fuzzy controller.

Key words: Magneto-rheological damper  Automotive vehicle  Fuzzy control  Hierarchical control  Road test

CLC No: U463.33

国家自然科学基金(50135030，60404014)和重庆市院士基金(027754)资助项目. Received 20040811, received in revised form 20050115