Corrective Steering
In addition to providing a variable steering ratio, the BMW active steering system is also capable of generating corrective steering actions to enhance vehicle yaw stability . Unlike conventional brake actuated stability control, corrective steering actions occur in a continuous manor and its operation is often not perceived by the driver. Furthermore; the elimination of brake intervention allows yaw stability control without loss of forward speed, thus vehicle performance is improved .
In the event of oversteer; the active steering system creates a countersteering action thus reducing the yaw moment and yaw rate. In extreme oversteer cases active steering works in conjunction with conventional brake actuated stability control for maximum effect . In the event of understeer, further increasing the front wheel slip angle does not generate additional lateral force at the front axle, therefore active steering is not helpful .
The corrective steering function is de-activated (along with the brake actuated stability control system) by pressing a dash mounted switch. This allows the driver full control over the front wheel steer angle and is intended for use in extreme recreational driving (e.g. on track days). The variable steering ratio remains active.
Read more about this topic: Active Steering
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