Patent ID: 7389850

Claim:
Auxiliary power assisted steering system of a motor vehicle comprising: a steering gear that converts a driver's intended steering, based on the driver's steering maneuver, into a displacement movement of tie rods assigned to steerable wheels; and a superimposing unit with which an additional steering angle can be superimposed on a steering angle selected by the driver, so that a gear ratio between the steering angle selected by the driver and travel of the tie rod pivot point on the steering gear is variable with respect to a gear ratio preselected by the steering gear, wherein when a power limit for a system supplying the auxiliary power assist or a limit value for the steering angle selected by the driver is exceeded, the gear ratio between the steering angle selected by the driver and the travel of the tie rod pivot point on the steering gear is adjusted to be more indirect in comparison with the preselected gear ratio by the superimposing unit superimposing an additional steering angle acting in the opposite direction on the steering angle selected by the driver so that a displacement speed of the tie rod pivot point is reduced in comparison with a speed of change of the steering angle selected by the driver, or by readjusting the travel of the tie rod pivot point with a time delay of the steering angle selected by the driver.