DIFFERENT ACTUATION STRATEGIES FOR A YAW MOMENT CONTROL OF A PASSENGER CAR

For a yaw moment stabilization of a passenger car in a critical driving situation the required external yaw moment can be provided by additional steering of the front or rear wheels or by unilateral braking. The numerical simulations are based on a complex vehicle model built up with a multi-body system program. For the design of the controller a simplified 4-wheel vehicle model and for the required state observer a 2-wheel vehicle model are used to derive the required stabilizing yaw moment which is then applied to the vehicle by a transformer to provide the individual inputs for each wheel, in particular additional steering angles for the front or rear wheels or unilateral braking forces. A comparison of these three transformer strategies clearly reveals their advantages and limitations.