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Electric power assisted steering systems

  • US 6,354,396 B1
  • Filed: 02/02/2000
  • Issued: 03/12/2002
  • Est. Priority Date: 02/05/1999
  • Status: Expired due to Fees
First Claim
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1. Electric power assisted steering system comprising:

  • a steering shaft operatively connected at a first end to a handwheel and at its other end operatively connected to at least one roadwheel, an electric motor having a rotor, a gearbox operatively connecting said steering shaft to said rotor, said gearbox having a non-integer reduction gear ratio, a first sensor adapted to produce an output dependent on the angular position of said steering shaft;

    a second sensor adapted to produce an output dependent on the angular position of said rotor, and processing means adapted to process both output signals to produce an angular position signal indicative of the angular position of said steering shaft over a range of greater than one complete revolution.

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