Patent ID: 6786294
Filing Date: 2004-09-07
Classification: B60R

Abstract:
A vehicle occupant restraint system for a vehicle comprisinga seat belt refractor for a seat belt, a bolt tightener drive, the drive moment of which may be transmitted by a rotor to the belt reel of the seat belt retractor, a torque transmission device exhibiting a given damping behavior transmits the drive moment to the belt reel, a first rotational angle sensor for scanning the rotational angle of the belt reel, the first rotational angle sensor supplies an electrical signal corresponding to a rotational angle of the belt reel to an evaluating device that determines from the electrical signal and the damping behavior a force acting upon torque transmission between the sear halt and a belted-in vehicle occupant, and a second rotational angle sensor for scanning sensor for scanning a rotational angle of the rotor, wherein the measurement data from the two rotational angle sensors are supplied to an evaluating device, which performs a diagnosis of the operation of the seat belt retractor by evaluating the measurement data supplied by the rotational angle sensors.