A FUZZY PREVIEW CONTROL SCHEME OF ACTIVE SUSPENSION FOR ROUGH ROAD

A new control algorithm of active suspension is proposed for rough roa ds. In this study, a quarter car model is used. The large tyre deflect ion and the stroke limit of the actuator are taken into consideration. A virtual damper concept is proposed to attenuate the tyre deflection by feeding back the relative velocity between road and unsprung mass to the force actuator. A fuzzy preview control scheme is presented to generate a reference curve by sensing the road information ahead of th e vehicle so that the actuator can operate within the stroke limit eve n in the rough road. Computer simulations are performed to verify the above concepts, and it is shown that satisfactory performance can be a chieved by the proposed control scheme.