To detect a state of water infiltration between a tire and a road surface before entering a hydroplaning state.SOLUTION: A road surface state estimation device 10 is composed of: an acceleration sensor 11 for detecting an acceleration in a tire radial direction; acceleration waveform extraction means 12 for extracting an acceleration waveform from the acceleration; differential waveform calculation means 13 for calculating a differential waveform of the acceleration waveform; rotation time calculation means 14 for calculating the rotation time of the tire from the differential waveform; scaling acceleration waveform creation means 15 for creating a scaling acceleration waveform using the rotation time of the tire; and road surface state estimation means 16 for determining whether or not the water infiltration between the tire and the road surface is a state transiting to a hydroplaning state.SELECTED DRAWING: Figure 1
【課題】タイヤと路面との間への水浸入状態を、ハイドロプレーニング状態に入る前に検知する。【解決手段】路面状態推定装置10を、タイヤ径方向加速度を検出する加速度センサ11と、前記加速度から加速度波形を抽出する加速度波形抽出手段12と、加速度波形の微分波形を算出する微分波形算出手段13と、微分波形からタイヤの回転時間を算出する回転時間算出手段14と、タイヤの回転時間を用いて、基準化加速度波形を作成する基準化加速度波形作成手段15と、タイヤと路面との間への水浸入状態が、ハイドロプレーニング状態に移行する状態であるか否かを判定する路面状態推定手段16とから構成した。【選択図】図1
ROAD SURFACE STATE ESTIMATION METHOD AND ROAD SURFACE STATE ESTIMATION DEVICE
路面状態推定方法及び路面状態推定装置
2019-02-07
Patent
Elektronische Ressource
Japanisch
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