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Method of detecting absolute steering angle of steering angle sensor for vehicle

  • US 5,065,324 A
  • Filed: 03/16/1990
  • Issued: 11/12/1991
  • Est. Priority Date: 03/22/1989
  • Status: Expired due to Fees
First Claim
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1. A method for detecting an absolute steering angle of a steering angle sensor mounted on a vehicle wherein said steering angle sensor generates an angle signal indicating a relative rotation angle of a steering shaft of said vehicle and a reference signal representing a reference position for every one rotation of said steering shaft, comprising:

  • detecting after completing the installation of said steering angle sensor on said vehicle, a deviation of angle between said reference signal and said angle signal generated at the time when said steering shaft is in an actual straight-ahead driving position, said deviation being stored in a memory of a computer, which memory retainer said deviation even though said computer is disconnected from a power supply;

    determining a steering angle away from said reference position in response to said angle signal and said reference signal while the vehicle runs; and

    correcting said steering angle with said deviation, thereby accurately obtaining an absolute steering angle regardless of any error in installing said steering angle sensor during the assembling of the vehicle.

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