Steering Response
One of the biggest differences you’ll see and feel between tires with high and low-performance ratings is the quickness of your steering response. You won’t have to turn your wheels as much when you have a tire with better traction because they can respond more accurately. Less tire flex also improves stability, allowing your vehicle to swerve and remain on the road.
Active steering systems can help the driver to master critical driving situations, for example aquaplaning and split braking. In these situations it is likely that the tires reach their performance limits, where nonlinear effects like saturation play an important role. Tires are the part in vehicle dynamics afflicted with the highest degree of nonlinearity due to saturation-and uncertainty-due to weather conditions.
Therefore, active steering systems have to be designed considering the uncertain and nonlinear tire characteristics which are determined by the road-tire-contact. This paper demonstrates how an important tire parameter, the cornering stiffness, can be estimated by measurement of dynamic vehicle parameters like lateral accelerations and yaw rate. This parameter indicates whether the saturation region of the tire is reached or not. Based on the estimate of the tire the robust decoupling control law by Ackermann (1996) for active front steering is extended.
Whether you need to dodge a dog or a fallen suitcase on the freeway, you need lightning fast steering response.
