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Friction Plausibility Detection Algorithm For a Steering System

  • US 20090150018A1
  • Filed: 10/22/2008
  • Published: 06/11/2009
  • Est. Priority Date: 12/10/2007
  • Status: Abandoned Application
First Claim
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1. A method for detecting and identifying friction in an electric power steering system for a vehicle, the method comprising the steps of:

  • measuring predetermined vehicle states;

    calculating idealized vehicle states using predetermined steering system signals and signals external to the steering system in predetermined state equations;

    comparing the measured predetermined vehicle states to the idealized vehicle states to isolate signal data of interest and define an estimate of friction that is present in the steering system;

    applying friction boundaries to the estimate of friction present in the steering system; and

    setting an internal software flag for the purpose of acknowledging the presence of high friction in the event the estimate of friction exceeds the friction boundaries.

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