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Electric power steering systems with improved road feel

  • US 9,327,762 B2
  • Filed: 12/14/2010
  • Issued: 05/03/2016
  • Est. Priority Date: 12/14/2010
  • Status: Active Grant
First Claim
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1. A method of controlling a motor drive torque in an electric power steering system having a motor and a steering assembly, the method comprising the steps of:

  • measuring, with a torque sensor, internal vibrations within the steering assembly representing smooth road shake (SRS) to generate a torque signal;

    processing the torque signal in accordance with a steering perception program to produce a motor control signal suitable to control the motor;

    evaluating the smooth road shake (SRS) of the torque signal and generating a dithering signal based on the smooth road shake (SRS) of the torque signal;

    superimposing the dithering signal onto the motor control signal to linearize the motor control signal with the dithering signal and produce a dithered motor control signal; and

    controlling the motor drive torque of the motor on the steering assembly based on the dithered motor control signal.

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