A TUNABLE FUZZY-LOGIC CONTROLLER FOR VEHICLE-ACTIVE SUSPENSION SYSTEMS

A novel fuzzy-logic-based control for vehicle-active suspension is sug gested. The vehicle vibration and disturbance are reduced considerably with a fuzzy logic controller, to enhance comfort in riding faced wit h uncertain road terrains. A quarter-car active suspension system is c ontrolled to reduce the vertical acceleration to a level of, that of, a hypothetical reference model. A new look-up table for the rule base of the fuzzy logic controller has been developed. The parameters, like , the spread, flex and centre of the bell-shaped membership functions associated with the different linguistic variables are fine tuned by t rial and error method to get the suspension acceleration and deflectio n on par with that of the model. Simulation studies clearly demonstrat e the effectiveness of the fuzzy logic controller for active suspensio n systems. The performance of the fuzzy logic controller under variati ons in the suspension component characteristics are also studied and w as found to give reasonably good responses.