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Steering apparatus for vehicle

  • US 4,645,025 A
  • Filed: 02/28/1986
  • Issued: 02/24/1987
  • Est. Priority Date: 03/06/1985
  • Status: Expired due to Term
First Claim
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1. A steering apparatus for a vehicle which steers both front and rear wheels, comprising:

  • an electric power steering unit for steering the rear wheels with a rotational force of a motor;

    first sensor for sensing a vehicle speed;

    second and third sensors for sensing front and rear wheel steering angles, respectively;

    an input signal processor consisting of a waveshaper for receiving and waveshaping a vehicle speed signal from said first sensor;

    first and second voltage transformers for transforming front and rear wheel steering angle voltages from said second and third sensors, respectively;

    first and second analog to digital converters for converting output signals from said first and second voltage transformers to digital signals representing front and rear steering angles, respectively;

    a control circuit supplied with the vehicle speed signal from said input signal processor and said digital signals representing front and rear steering angles from said first and second analog to digital converters, respectively, to generate and supply a signal for steering said rear wheel to said electric power steering unit, said control circuit including a decoder, a plurality of pattern memories, a subtracter, and a timer.

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