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Method and device for measuring the angle of rotation of the steering shaft of a motor vehicle

  • US 5,027,648 A
  • Filed: 07/05/1989
  • Issued: 07/02/1991
  • Est. Priority Date: 07/05/1988
  • Status: Expired due to Term
First Claim
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1. A method for measuring the angle of rotation of a steering shaft of a motor vehicle with an angular position sensor emitting a signal varying between two extremes and representing the relative position of the shaft, comprising the steps of:

  • measuring the speed VV of the vehicle;

    comparing the speed VV to a predetermined speed VM;

    zeroing a shaft rotation counter for counting rotations of the shaft when VV is greater than VM;

    detecting the direction of movement of the shaft to a position corresponding to an extreme of the signal emitted by the sensor, in order to increment or decrement the counter according to the direction detected; and

    combining the number of turns recorded in the counter with the current signal emitted by the sensor in order to form a signal representing the angle of rotation of the steering shaft.

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