Patent ID: 7029032
Filing Date: 2006-04-18
Classification: B60R

Abstract:
1. A method for actuating a reversible belt pretensioner for pretensioning a belt webbing wound around a belt reel of a seat belt in a motor vehicle, the belt pretensioner having a drive which acts on the belt reel and the seat belt having, as a belt extraction lock, a locking device which acts on the belt reel in an unwinding direction and is released only if the belt reel is turned about an angular element in a winding-on direction, comprising the steps of: triggering the belt pretensioner; satisfying a pre-defined condition; actuating the belt pretensioner after the triggering and satisfying steps such that the belt reel turns at least so far in the winding-on direction that the locking device of the belt reel opens and releases the belt webbing for unwinding; wherein a variable which is indicative of the opening of the locking device is registered and wherein the belt pretensioner is actuated in such a way that the belt reel rotates just to such an extent that the locking device of the belt reel opens and releases the belt webbing for unwinding.