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PROVIDING ASSIST TORQUE WITHOUT HAND WHEEL TORQUE SENSOR FOR ZERO TO LOW VEHICLE SPEEDS

  • US 20160075371A1
  • Filed: 09/15/2014
  • Published: 03/17/2016
  • Est. Priority Date: 09/15/2014
  • Status: Active Grant
First Claim
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1. A method of controlling an electric power steering system of a vehicle, the method comprising:

  • filtering a hand wheel angle with a low-pass filter;

    flittering a hand wheel velocity with a low-pass filter;

    determining that one or more hand wheel torque sensors of the vehicle are not enabled;

    estimating steering rack force caused by a tire of the vehicle and a surface of a ground with which the tire is in contact with the filtered hand wheel angle and the filtered hand wheel velocity;

    generating a steering assist torque command based on the estimated steering rack force; and

    controlling the electric power steering system using the steering assist torque command.

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