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, a calculation time of the Kernel function Kis shortened by using Ybeing the reference feature vector in which a Lagrange multiplier λ is equal to a preset threshold m or larger as the 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YASVJとからカーネル関数KAを算出する際に、前記基準特徴ベクトルYASVJとして、ラグランジェ未定乗数λが、予め設定された閾値m以上である基準特徴ベクトルであるYAKJを用いることで、カーネル関数KAの演算時間を短縮するようにした。【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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