Title:
ROAD SURFACE STATE DETERMINATION METHOD AND ROAD SURFACE STATE DETERMINATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/230181
Kind Code:
A1
Abstract:
In the present invention, after a windowing means is used to window, with a time T, a time-series waveform of the tire vibration detected by an acceleration sensor and feature vectors Xi for each time window are calculated through the extraction of the tire-vibration time-series waveforms for each time window, kernel functions KA are calculated from the feature vectors Xi for each time window and road surface feature vectors YAj that are feature vectors for each time window calculated from tire-vibration time-series waveforms that have been calculated beforehand for each road surface state. In the calculation of the kernel functions KA, the feature vectors Xi for each time window and the road-surface feature vectors YAj are made to be the vibration levels for a frequency band of 500 Hz or greater extracted from the time-series waveforms for each time window.
Inventors:
ISHII KEITA (JP)
MASAGO TAKESHI (JP)
GOTO TAKATO (JP)
MASAGO TAKESHI (JP)
GOTO TAKATO (JP)
Application Number:
PCT/JP2018/017083
Publication Date:
December 20, 2018
Filing Date:
April 26, 2018
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
International Classes:
B60C19/00; G01W1/00; B60W40/068
Foreign References:
| JP2014035279A | 2014-02-24 | |||
| JP2011046256A | 2011-03-10 | |||
| JP2002039854A | 2002-02-06 | |||
| US20070050121A1 | 2007-03-01 | |||
| JP2014035279A | 2014-02-24 |
Other References:
See also references of EP 3640685A4
Attorney, Agent or Firm:
MIYAZONO Yasuo (JP)
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