METHOD FOR ESTIMATING CONDITION OF ROAD SURFACE

Title:

METHOD FOR ESTIMATING CONDITION OF ROAD SURFACE

Document Type and Number:

WIPO Patent Application WO/2011/145356

Kind Code:

A1

Abstract:

Disclosed is a method which is for estimating the condition of a road surface and which can estimate by further subdividing a snow covered road during travel. In the disclosed method, tyre vibration in the circumferential-direction of a tyre, road surface temperature (T) and tyre-generated noise are each detected by an acceleration sensor, a road surface thermometer, and a microphone, and then band values P11, P12 and P13 for a pre-tread region (R1), band values P21, P22 and P23 for a tread region (R2), band values P31, P32 and P33 for a pre-kick-out region (R3), band values P41 and P42 for a kick-out region (R4), and band values P51, P52 and P53 for a post kick-out region (R5) are calculated from the tyre vibration data. A sound pressure level comparison (Q)=(PA/PB), which is the comparison of a band power value (PB) of a high frequency band and a band power value (PA) of a low frequency band, is calculated from data on the tyre-generated noise; and band value (Pij), data on the road surface temperature (T), and the sound pressure level comparison (Q) are used to estimate the condition of the road surface.

Inventors:

HANATSUKA YASUSHI (JP)
WAKAO YASUMICHI (JP)
MORINAGA HIROSHI (JP)

Application Number:

PCT/JP2011/050417

Publication Date:

November 24, 2011

Filing Date:

January 13, 2011

Export Citation:

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Assignee:

BRIDGESTONE CORP (JP)
HANATSUKA YASUSHI (JP)
WAKAO YASUMICHI (JP)
MORINAGA HIROSHI (JP)

International Classes:

G01W1/00; B60T8/172; B60W40/06; G01H17/00

Domestic Patent References:

WO2006135090A1	2006-12-21
WO2010050300A1	2010-05-06
WO2008136303A1	2008-11-13
WO2006135090A1	2006-12-21

Foreign References:

JP2008120292A	2008-05-29
JP2007055284A	2007-03-08
JPH06174543A	1994-06-24
JPH08261993A	1996-10-11

Other References: