| 摘要 |
A belt retractor for a vehicle safety belt comprises a rotatably mounted belt spool, a drive wheel coupled coaxially with the belt spool, an electric motor which can drive the drive wheel at a variable drive force, and an electronic control unit which can control the electric motor. The belt spool is rotatable to a limited extent with respect to the drive wheel and a sensor is provided that on rotation of the belt spool relative to the drive wheel generates a signal which is representative of the belt force acting in the safety belt and is supplied to the electronic control unit.
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