IJCAS

The excellent performance of the controller and its insensitivity to time-delay are very important for active suspension. In this paper, a novel output-feedback H∞ optimal controller is designed for half-vehicle suspension system and it performs better than the common output-feedback H∞ optimal controller. To further study the effect of time-delay on the performance of the controller, a visual modeling and simulation method is proposed, and the detailed modeling process is given. The influence of time-delay on the vertical acceleration and pitching acceleration of vehicle body is simulated under bump road excitation and C-class pavement excitation, respectively. The results show that when the time-delay is less than 25 ms, the performance of the controller is little affected under the bump road, and under the C-level road excitation, even if the time-delay reaches 50 ms, the performance of the controller will not be affected.

Keywords: Active half-vehicle suspension, H∞ optimal control, output-feedback, time-delay, visual modeling and simulation.