To provide a road face state discrimination method which can secure the discrimination accuracy of a road face state even if reducing a calculation amount of time elongation/contraction, and a road face state discrimination device.SOLUTION: A time series waveform of tire vibration detected by an acceleration sensor is curtained by a time T by curtaining means, a feature vector Xat each time window is calculated by extracting the time series waveform of the tire vibration at each time window, and after that, when calculating a Kernel function Kfrom the feature vector Xat each time window, and a reference feature vector Ybeing a feature vector at each time window which is acquired in advance at each road face state which is calculated in advance, both a digit number nnot larger than a decimal point of the feature vector Xat each time window, and a digit number nnot larger than a decimal point of the reference feature vector Yare changed to n which is smaller than n, and a Kernel function Kis calculated from the feature vector Xat each time window which is changed in the digit number, and a reference feature vector Y.SELECTED DRAWING: Figure 8
【課題】時間伸縮の計算量を削減しても路面状態の判別精度を確保することができる路面状態判別方法と路面状態判別装置とを提供する。【解決手段】加速度センサーにより検出したタイヤ振動の時系列波形を窓掛け手段により時間Tで窓掛けして、時間窓毎のタイヤ振動の時系列波形を抽出して時間窓毎の特徴ベクトルXiを算出した後、この時間窓毎の特徴ベクトルXiと、予め算出しておいた路面状態毎に求めておいた時間窓毎の特徴ベクトルである基準特徴ベクトルYAKJとからカーネル関数KAを算出する際に、時間窓毎の特徴ベクトルXiの小数点以下の桁数n0と基準特徴ベクトルYAKJの小数点以下の桁数n0とを、ともに、n0よりも小さなnに変更し、この桁数の変更された時間窓毎の特徴ベクトルXiと基準特徴ベクトルYAKとから、カーネル関数KAを算出するようにした。【選択図】図8
ROAD FACE STATE DISCRIMINATION METHOD AND ROAD FACE STATE DISCRIMINATION DEVICE
路面状態判別方法及び路面状態判別装置
2019-12-26
Patent
Electronic Resource
Japanese
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
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