Study On Simulation Of Active Roll Control For Sport Utility Vehicle

The active roll control (ARC) system is a new type of suspension control system emerged in recent years. With the anti-roll bars'intervention and regulation to suspension, active roll control system can achieve the properly control of vehicle dynamics. It can enhance the roll stiffness evidently, minish the chassis roll angle, give assurance to the ride comfort, and also partly enhance the vehicle maneuver stability. The ARC is becoming one of the research hotspots in the field of vehicle technology, for the reason of evidently improving the active safety.The article investigated the ARC's influence on the sport utility vehicle's maneuver and anti-roll stability systematically and generally. The following subjects are studied:Firstly, a 3 DOFs dynamic SUV model including lateral, yaw and roll freedoms was built. An active roll state feedback controller was built based on the SUV model. Stability, time domain characteristics, frequency domain characteristics and sensitivity of the vehicle equipped with ARC were analyzed .The simulation results show that chassis roll angle and roll rate was sharply reduced due to inducting of the ARC. The results of steering step experiment indicate that the yaw rate's natural frequency of the vehicle equipped with ARC system was smaller, the steering manipulation and transient response was improved slightly.Secondly, a virtual car model was built by using ADAMS/Car. The model was simplied with 95 DOFs equipped with active anti-roll bars in front and rear suspensions. Meanwhile, the active roll controller was built in Matlab/simulink environment based on fuzzy PID. Co-simulation of the handing and roll characteristics was carried out between the multi-dynamic vehicle model and the active roll controller. The results of double lane change test, pylon course slalom test, steering step test and steady static circular test show that the vehicle equipped with ARC is Superior than the general vehicle in aspects of reducing chassis roll angle and roll rate; and fuzzy PID control, compared to simply PID control, required lower level working frequency and reliability of the actuator.The author reckons the research technique and conclusion could be helpful to establishing the ARC dynamics model, selection of hydraulic motor and design of the controller of an ARC.