Abstract: The mathematic model of whole vehicle semi-active suspension system is built on the basis of large-scale system theory. The fuzzy controller of time-delay semi-active suspension of the subsystems of suspension system is designed. By using the large-scale system hierarchical control theory, integrated control of vehicle suspension system is realized, the dynamic performance of vehicle is analyzed, and on the basis of simulation computer, road test of actual vehicle is carried out. The results show that the large-scale system hierarchical control system can improve the stability of control system, which opens a new way for the research of semi-active suspension and its control system.

Key words: Integration control, Large scale system, Semi-active suspension