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The most important task for the driver in a vehicle running at high speed is to bypass the obstacle under emergency because of insufficient vehicle-to-vehicle distance. A vehicle dynamics control strategy was developed to prevent vehicles from spinning and drifting out on high speed obstacle avoidance under emergency. With vehicle dynamics control system, counter braking is applied at individual wheels as needed until steering control and vehicle stability are regained, i.e. the vehicle can pass by the obstacle. On the other hand, vehicle dynamics control system may increase the vehicle roll angle, or even deteriorate on-road rollover events. An anti-rollover control system was introduced in this paper to prevent vehicle from rollover. The simulation results showed that with this improved control system, the vehicle can afford nice manoeuvrability and passenger comfortability. [ABSTRACT FROM AUTHOR]

An active suspension system for vehicles using fuzzy logic controls is presented in this paper. The model is described by a linear system with six degrees of freedom, subject to irregular excitations from the road surface. Based on control theory, the fuzzy control system of the active suspension is proposed. With the aid of software Matlab/simulink, a lot of simulation process is done. Simulation results indicate that the proposed active suspension system proves to be effective in the vibration isolation of the suspension system. What΄s more, a mechanical dynamic animation of six-degree-of -freedom half body of vehicle suspension system is obtained, with the aid of software ADAMS and media player. The animation demonstrates the mechanism principle of suspension system more vividly and visually. [ABSTRACT FROM AUTHOR]