Method for actuating a reversible belt pretensioner
AssigneeDaimlerChrysler AG
InventorsWilfried Bullinger, Walter Eberle
Life of this patent
Estimating the term…
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.
Claims18
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.
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 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.
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 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.
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 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.
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 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.
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 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.
Dependencies are inferred from the claim text.