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Direct determination of the maximum grip coefficient on the basis of measurement of the circumferential extension in a sidewall of a tire

  • US 7,099,765 B2
  • Filed: 08/04/2004
  • Issued: 08/29/2006
  • Est. Priority Date: 02/08/2002
  • Status: Active Grant
First Claim
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1. A method of determining the grip coefficient μ

  • in the contact area of a tire of a vehicle on a road, comprising the steps of;

    selecting a plurality of points in space that are fixed in a reference frame associated with the vehicle, which plurality of points lie at mutually different azimuths along a circumference in at least one sidewall of the tire,obtaining a corresponding number of measurements of circumferential distance variation at the plurality of points when the tire is rolling on the road, the measurements producing measurement signals, anddetermining from the measurement signals a grip coefficient μ

    for the tire contact area on the road.

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