Title:
ROAD SURFACE CONDITION DETERMINATION METHOD AND ROAD SURFACE CONDITION DETERMINATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/244379
Kind Code:
A1
Abstract:
As a result of the present invention, a chronological waveform having a time length TK that is within the range of 13T/40 < TK < 19T/40 and includes a stepping point time tf, a kicking point time tk, or a ground contact center point time tc can be cut out from a chronological waveform for detected tire vibration, a window function can be applied to a cut-out waveform being this cut-out chronological waveform, a cut-out waveform for each time window can be extracted, and a feature vector Xi for each time window can be calculated, when calculating a kernel function KA from the feature vector Xi for each time window and a reference feature vector YASVJ being a feature vector for each time window found for each road surface state calculated beforehand, said kernel function KA being calculated after: windowing chronological waveforms for tire vibration detected by an acceleration sensor, for time T, by using a windowing means; extracting the chronological waveform for tire vibration for each time window; and calculating the feature vector Xi for each time window.
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Inventors:
ISHII KEITA (JP)
MASAGO TAKESHI (JP)
GOTO TAKATO (JP)
MASAGO TAKESHI (JP)
GOTO TAKATO (JP)
Application Number:
PCT/JP2018/047157
Publication Date:
December 26, 2019
Filing Date:
December 21, 2018
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
International Classes:
G01W1/00; B60C19/00; B60W40/068
Domestic Patent References:
| WO2009157516A1 | 2009-12-30 |
Foreign References:
| JP2016107833A | 2016-06-20 | |||
| JP2014035279A | 2014-02-24 |
Attorney, Agent or Firm:
MIYAZONO Yasuo (JP)
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