Yaw Moment Compensation

With conventional systems, the driver has to actively steer the vehicle in a straight line if the brakes are applied on a road surface with non-uniform traction levels ("split "MU""). In this situation counter steering keeps the vehicle in its track and helps to achieve acceptable braking distances.

On the E90, if the vehicle is equipped with the Active Front Steering (AFS) option and brakes are applied on a road surface with non-uniform traction levels ("split "MU""), DSC in conjunction with AFS, initiates the active steering actions in order to stabilize the vehicle and shorten the braking distance. The function is accomplished by having the DSC control module calculate the yaw rate plus interpret information from the front steering angle sensor and transmit the information to the AFS control module, which establishes the yaw-moment compensation correction angle needed for stabilization/counter steering.