ROAD SURFACE CONDITION ESTIMATION METHOD

Title:

ROAD SURFACE CONDITION ESTIMATION METHOD

Document Type and Number:

WIPO Patent Application WO/2015/133155

Kind Code:

A1

Abstract:

The purpose of the invention is to provide a method for determining with high accuracy whether or not a large input has been applied to a tire and estimating a road surface condition without having to increase the number of sensors. An acceleration sensor is disposed on the tire and vibrations of the tire in motion are detected. The position of the depression point and the position of the kick-out point of the tire are estimated on the basis of peak positions appearing in the time-varying waveform of the vibrations, and whether or not the estimated positions of the depression point and the kick-out point are the actual positions of the depression point and the kick-out point is determined using any one or more of the following: tire ground-contact time, non-ground-contact time, and rotating time calculated from the estimated positions of the depression point and the kick-out point. If the result of the depression and kick-out position determination indicates that the estimation was erroneous, road surface condition estimation is not performed.

Inventors:

HANATSUKA YASUSHI (JP)

Application Number:

PCT/JP2015/050029

Publication Date:

September 11, 2015

Filing Date:

January 05, 2015

Export Citation:

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Assignee:

BRIDGESTONE CORP (JP)

International Classes:

B60W40/06; B60C19/00; G01W1/00

Foreign References:

JP2007106243A	2007-04-26
JP2002002472A	2002-01-09
JP2008302848A	2008-12-18

Other References: