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Methods, systems and apparatus for steering wheel vibration reduction in electric power steering systems

  • US 9,266,558 B2
  • Filed: 03/15/2013
  • Issued: 02/23/2016
  • Est. Priority Date: 09/15/2010
  • Status: Active Grant
First Claim
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1. A method for reducing vibrations at a steering wheel caused by periodic disturbances in a steering system including the steering wheel and an electric motor configured to apply a motor torque that assists steering by the steering wheel, the method comprising:

  • determining a gross torque attributable to the periodic disturbances in the steering system;

    identifying a desired amount of suppression of the vibrations at the steering wheel;

    determining an offset torque based on the gross torque and the desired amount of suppression; and

    generating a motor command signal in a manner that is influenced by the offset torque, wherein the motor command signal influences the motor torque, wherein generating the motor command signal comprises;

    performing at least one heterodyning operation during the generation of the motor command signal.

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