Modeling and force tracking control for active suspension system

To improve riding comfort of vehicles, modeling and force tracking control for an active suspension system was presented. The controller structure of active suspension system was divided into two loops: outer loop and inner loop. The outer loop calculated the optimal force depending on the states of vehicle model and the road disturbances. The inner loop was used to keep the actual force which was generated by the actuator to close the target force. A linear actuator model was established and the error of tracking was controlled by the PI algorithm, LQG technique was used to generate the target force. The performance of force tracking shows significant improvement in body acceleration as compared to the passive suspension system and being able to track the target force well.