H∞ Output Feedback Semi-active Control of Vehicle Seat Suspension with Parameters Uncertainty
Zhang Zhiyong1, Liu Xin1, Huang Caixia2, Wang Xianghong1
1. College of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha 4100042. The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082
Abstract：For the parameters uncertainty and the puzzle of displacement measurement in seat suspension system, based on linear matrix inequality and H∞ optimal control theory, an H∞ output feedback controller of seat suspension system subject to parameters uncertainty is established. This controller can produce expected control force by using of the system measuring output to estimate states. The control voltage of magneto-rheological damper is adjusted by on-off control algorithm, in which the expected control force is compared with the current damper force under the restrict of semi-active and extremum limitation，and the damper force of magneto-rhological damper can track the expected control force well. The result of numeric simulations testify that the controller can effectively isolate the seat from external exciting and improve ride comfort of driver, even if only the seat acceleration is acted as measuring output for states estimation and there are parameters uncertainty in seat suspension.
2013, Vol. 32 
