Design of an active roll control system for hybrid four-wheel-drive vehicles

This paper presents a method for designing an active roll control system, combined with integrated chassis control for hybrid four-wheel-drive vehicles. The active roll control system adopts an active anti-roll bar as an actuator and is designed by model matching control with a roll estimator. To maintain the manoeuvrability of hybrid four-wheel-drive vehicles with an active roll control system, integrated chassis control is adopted. The hybrid four-wheel-drive vehicle consists of a front internal-combustion engine and independent motor-driven rear wheels and is equipped with electronic stability control, active front steering and four-wheel drive. Direct yaw moment control is used to generate a control yaw moment. Weighted pseudo-inverse-based control allocation and simulation-based optimization are proposed to distribute the control yaw moment. Simulations on the vehicle simulation software CarSim show that the proposed active roll control system with integrated chassis control is effective for controlling the roll motion and the yaw motion of a hybrid four-wheel-drive vehicle.