Trw Automotive Electronics & Components Gmbh & Co. Kg

Rolf D&uuml;rrstein

Cornelius Peter

The torque developed at a belt shaft of a belt retractor coupled to an electric motor via a drive belt is controlled so as to avoid a hysteresis. For this purpose, the direction of rotation of the belt shaft is detected and, depending on the direction of rotation as detected, the electric current supplied to the electric motor is changed from a first value to a second value that is different from the first value by an amount required to compensate for hysteresis.

Method of controlling the torque developed at a belt shaft of a belt retractor coupled to an electric motor

A belt retractor for an occupant restraint system comprises a frame, a belt reel rotatably mounted in the frame, an electric motor drive coupled to the belt reel, a locking mechanism for selectively blocking the belt reel, and a vehicle-sensitive sensor. The locking mechanism is actuated by an actuator. An electronic control unit is provided with an input interface and an output interface. The vehicle-sensitive sensor is connected to the input interface, and the actuator and the electric motor drive are connected to the output interface.

Growing community of inventors

Bietigheim, Germany

Rolf Dürrstein

Growing community of inventors

Bietigheim, Germany

Rolf D&uuml;rrstein

Rolf Dürrstein