Method for actuating a reversible belt pretensioner
3 Assignments
0 Petitions
Accused Products
Abstract
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, 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 the unwinding direction and whose locking can be released only if the belt reel is rotated about a certain angle of rotation in the winding-on direction. After a triggering of the belt pretensioner caused by a hazardous situation and if a variable indicative of the belt force indicates a decrease in the belt force, an opening mode is initiated in which the belt pretensioner drive is actuated in order to open the blocking device in such a manner that, at the beginning of the opening mode, the belt reel rotates about the specific angle of rotation in the winding-on direction.
40 Citations
34 Claims
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1-12. -12. (canceled)
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13. 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 as a belt extraction lock, a 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, when a variable indicative of the belt force indicates a decrease in the belt force, initiating 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.
- 14. 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 as a belt extraction lock, a 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 when a variable indicative of the belt force indicates the fact that the belt force falls short of a predefinable threshold, initiating 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.
Specification