Road vehicle rollover avoidance using active steering controller

Aim of this paper is to develop yaw and roll vehicle model and active steering control preventing rollover. Selecting the center of gravity of the vehicle´s sprung mass; an active control which is a function of certain parameters is designed. Stability augmentation control, emergency steering control and emergency braking control are three feedback loops. An auxiliary steering angle from stability augmentation control and emergency steering control is set by an actuator to the steering angle. Stability augmentation control is based on feedback of the roll rate and roll acceleration. Emergency steering control and emergency braking control are based on feedback of the rollover coefficient. The sensitivity function at different points and simulation represent the evaluation of the control concept. Absolute stability of the steering control concept is analyzed to illustrate the effective design technique of the rollover avoidance control.