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Method for attenuating smooth road shake in an electric power steering system

  • US 8,271,163 B2
  • Filed: 09/23/2009
  • Issued: 09/18/2012
  • Est. Priority Date: 09/23/2009
  • Status: Expired due to Fees
First Claim
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1. A method for attenuating smooth road shake at a steering wheel of a steering column of a motor vehicle having an electric power steering system including an electric motor and a rack, comprising the steps of:

  • determining a frequency range of the smooth road shake during predetermined driving conditions of the motor vehicle;

    mechanically tuning an electric power steering motor assembly of the motor vehicle electric power steering system to a predetermined frequency to thereby provide a tuned vibration absorber having a mechanically tuned resonance frequency substantially proximate the frequency range of the smooth road shake; and

    damping the tuned vibration absorber to maximize rack stiffness at the frequency range of the smooth road shake so as to thereby minimize smooth road shake at the steering wheel over a range of vehicle speeds.

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