To reduce a calculation amount of time elongation/contraction while securing the discrimination accuracy of a road face state.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, the time series waveform which includes a time tof a step point, a time tof a kick point, or a time tof a grounding center point, and whose time length Tis within a range of 13T/40

    【課題】路面状態の判別精度を確保しつつ、時間伸縮の計算量を削減する。【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YASVJとからカーネル関数KAを算出する際に、検出されたタイヤ振動の時系列波形から、踏み込み点の時刻tf、蹴り出し点の時刻tk、もしくは、接地中心点の時刻tcのいずれかの時刻含む、時間長さTKが、13T/40<TK<19T/40の範囲にある時系列波形を切り出し、この切り出された時系列波形である切り出し波形に窓関数をかけて時間窓毎の切り出し波形を抽出して、時間窓毎の特徴ベクトルXiを算出するようにした。【選択図】図8


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    Title :

    ROAD FACE STATE DISCRIMINATION METHOD AND ROAD FACE STATE DISCRIMINATION DEVICE


    Additional title:

    路面状態判別方法及び路面状態判別装置


    Contributors:
    ISHII KEITA (author) / MASAGO GO (author) / GOTO TAKAHITO (author)

    Publication date :

    2019-12-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen



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