Patent ID: 7325641
Filing Date: 2008-02-05
Classification: B60R

Abstract:
1. A method for actuating a reversible belt pretensioner for pretensioning a belt webbing, unwound from a belt reel, of a seat belt in a motor vehicle, wherein the belt pretensioner has a drive configured to act on the belt reel, and the seat belt has a belt extraction locking device which acts on the belt reel in the unwinding direction and whose locking can be released only if the belt reel is rotated about an angle of rotation in the winding-on direction, comprising initiating, after a triggering of the belt pretensioner caused by a hazardous situation and sensing when a variable indicative of the belt force indicates a decrease in the belt force, an opening mode in which the belt pretensioner drive is actuated to open the locking device so that, at a beginning of the opening mode, the belt reel rotates through the angle of rotation in the winding-on direction.