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Road-surface friction coefficient estimating device and road-surface friction coefficient estimating method

  • US 7,702,446 B2
  • Filed: 07/06/2004
  • Issued: 04/20/2010
  • Est. Priority Date: 07/07/2003
  • Status: Expired due to Fees
First Claim
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1. A road-surface friction coefficient estimating device for estimating a road-surface friction coefficient by updating the road-surface friction coefficient with time lapse by using an estimated present value of the road-surface friction coefficient as a standard for a next estimation of the road-surface friction coefficient, comprising:

  • a specifying unit for specifying the road-surface friction coefficient based on road-surface information detected by a road-side infrastructure in a traveling direction of a vehicle when the road-surface information is acquired; and

    an estimating unit for setting the specified road-surface friction coefficient as an initial value, resetting the estimated present value of the road-surface friction coefficient to the initial value and then starting next estimation of the road-surface friction coefficient with the initial value as a standard for a next estimation of the road-surface friction coefficient,wherein the specifying unit previously stores plural road-surface friction coefficients corresponding to plural pieces of road-surface information, andwherein the specifying unit specifies the road-surface friction coefficient corresponding to the acquired road-surface information from the plural road-surface friction coefficients associated with the plural pieces of road-surface information.

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