Title:
METHOD AND DEVICE FOR DETERMINING STATE OF ROAD SURFACE
Document Type and Number:
WIPO Patent Application WO/2014/025018
Kind Code:
A1
Abstract:
According to the present invention, a time-series waveform of tire vibration detected by an acceleration sensor is screened by a screening means; the time-series waveform of tire vibration for each time window is extracted to calculate a characteristic vector for each time window, after which a kernel function is calculated from the characteristic vector for each time window and from a road surface characteristic vector, which is the characteristic vector for each time window calculated from the time-series waveform of tire vibration determined for each road-surface state calculated in advance; and the values of an identifying function that uses the kernel function are compared to determine the road-surface state, whereby the road-surface state can be determined from the time-series waveform of tire vibration without detecting a peak position or measuring the vehicle wheel speed, and robustness relative to changes in tire size can be used in the determination of the road-surface state.
Inventors:
HANATSUKA YASUSHI (JP)
HIGUCHI TOMOYUKI (JP)
MATSUI TOMOKO (JP)
HIGUCHI TOMOYUKI (JP)
MATSUI TOMOKO (JP)
Application Number:
PCT/JP2013/071674
Publication Date:
February 13, 2014
Filing Date:
August 09, 2013
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
KEK HIGH ENERGY ACCELERATOR (JP)
KEK HIGH ENERGY ACCELERATOR (JP)
International Classes:
B60W40/068; G01W1/00; B60C19/00
Domestic Patent References:
| WO2006135909A1 | 2006-12-21 |
Foreign References:
| JP2011242303A | 2011-12-01 | |||
| JP2008280038A | 2008-11-20 | |||
| JP2007055284A | 2007-03-08 | |||
| JP2007095069A | 2007-04-12 |
Other References:
See also references of EP 2883772A4
Attorney, Agent or Firm:
MIYAZONO Junichi et al. (JP)
Junichi Miyazono (JP)
Junichi Miyazono (JP)
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