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Road surface condition estimating method, vehicle control method, and road surface condition estimating apparatus

  • US 9,045,117 B2
  • Filed: 05/15/2012
  • Issued: 06/02/2015
  • Est. Priority Date: 05/16/2011
  • Status: Active Grant
First Claim
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1. A method for estimating a road surface condition,comprising the steps of:

  • detecting vibrations of a tire having a block pattern by a vibration detecting unit;

    performing a rotational order ratio analysis on the tire vibrations by a rotational order components extracting unit; and

    estimating a current road surface condition from an amplitude of a rotational order component of the analyzed tire vibrations by a road surface condition estimating unit,wherein the tire has at least one row of blocks and lug grooves, each lug groove being disposed between adjacent blocks of the row of blocks, the total number N of the circumferentially disposed blocks and corresponding lug grooves being 10 or more,wherein a number n of lug grooves are provided with a joining section connecting circumferentially adjacent blocks, a relation between n and the total number N satisfying the range of (N/2)≦

    n≦

    (N−

    5), andwherein the order of the rotational order component for estimation of the road surface condition is (N−

    n).

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