Method for actuating a reversible belt pretensioner
First Claim
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 turnsat 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.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to 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. The seat belt has a locking device, acting on the belt reel in the unwinding direction, as a belt extraction lock. After the triggering of the belt pretensioner and when a predefinable condition is met, the belt pretensioner is actuated in such a way that the belt reel rotates at least to such an extent in the winding-up direction that the locking device of the belt reel opens and releases the belt webbing for unwinding.
18 Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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:
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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 an amount in the winding-on direction; and opening the locking device of the belt reel in response to the actuating step to release the belt webbing for unwinding; wherein an angle of rotation of the belt reel is registered by an angle-of-rotation sensor and wherein the angle of rotation is used to determine the opening of the locking device.
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15. 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:
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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 an amount in the winding-on direction; and opening the locking device of the belt reel in response to the actuating step to release the belt webbing for unwinding; wherein the belt pretensioner has an electromotive drive and wherein an angle of rotation of the electromotive drive is registered and further wherein the belt pretensioner is actuated in such a way that a torque of the drive is increased until a predefined angle of rotation is reached.
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16. 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:
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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 an amount in the winding-on direction; and opening the locking device of the belt reel in response to the actuating step to release the belt webbing for unwinding; wherein the belt pretensioner is actuated in such a way that when the belt webbing is pretensioned and after the locking device is opened, the belt webbing is unwound from the belt reel in such a way that a belt-webbing-sensitive sensor does not bring about a triggering of the locking device.
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17. 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:
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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 an amount in the winding-on direction; and opening the locking device of the belt reel in response to the actuating step to release the belt webbing for unwinding; further comprising a drive for a seat adjustment mechanism, and wherein the seat adjustment mechanism is actuated in such a way that the locking device can be opened by the belt pretensioner drive.
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18. 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:
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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 an amount in the winding-on direction; and opening the locking device of the belt reel in response to the actuating step to release the belt webbing for unwinding; further comprising a drive for an adjustment device of a belt deflection roller and wherein the adjustment device is actuated in such a way that the locking device can be opened by the belt pretensioner drive.
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Specification