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1. (WO2018003366) ROAD SURFACE STATE DETERMINATION METHOD

Pub. No.:    WO/2018/003366    International Application No.:    PCT/JP2017/019681
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Sat May 27 01:59:59 CEST 2017
IPC: G01W 1/00
B60C 19/00
B60W 40/068
Applicants: BRIDGESTONE CORPORATION
株式会社ブリヂストン
Inventors: HANATSUKA Yasushi
花塚 泰史
GOTO Takato
後藤 嵩人
Title: ROAD SURFACE STATE DETERMINATION METHOD
Abstract:
A time series waveform of detected vibration of a tire during travel is multiplied by a window function of a prescribed time width and a time series waveform for each time window is extracted to calculate feature vectors from the time series waveform for each time window. Thereafter, when determining the state of the road surface during travel using said feature vectors for each time window and road surface models, a plurality of the aforementioned road surface models is constructed depending on the magnitude of the braking and driving forces, the braking and driving forces acting on the aforementioned tire are estimated, and the state of the road surface is determined using the road surface models, which depend on the aforementioned feature vectors and the magnitude of the estimated braking and driving forces. The aforementioned road surface models are constructed with learning data comprising time series waveform data of tire vibration obtained by causing a vehicle mounted with a tire provided with an acceleration sensor to travel on road surfaces in multiple road surface states.