Robust Yaw Damping of Cars withFront and

For a linear model of active car steering a robust decoupling control law by feedback of the yaw rate to front wheel steering was derived earlier. In the present paper this control law is extended by feedback of the yaw rate to rear wheel steering. A controller structure with one free damping parameter k D is derived with the following properties: i) Damping and natural frequency of the yaw mode are independent of speed. ii k D can be adjusted to the desired damping level. iii) A variation of k D has no innuence on the natural frequency of the yaw mode and no innuence on the steering transfer function by which the driver keeps the car | considered as a mass point at the front axle | on his planned path. Simulations with a nonlinear car steering model show signiicant safety advantages of the new control concept in situations when the driver of the conventional car has to stabilize unexpected yaw motions.