Patent ID: 7702446
Filing Date: 2010-04-20
Classification: B60G,B60T,B60W,G08G

Abstract:
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, and wherein 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.