To improve a calculation speed by decreasing a calculation amount while securing the accuracy of the two-road face discrimination of DRY/WET by properly selecting a feature amount used for the calculation of a Kernel function.SOLUTION: When calculating a Kernel function Kfrom a feature vector Xat each time window, and a road face feature vector Ybeing a feature vector at each time window which is calculated from a time series waveform of tire vibration which is acquired at each road face state which is calculated in advance after calculating the feature vector Xat each time window by extracting the time series waveform of the tire vibration at each time window by windowing the time series waveform of the tire vibration which is detected by an acceleration sensor by a time T by using windowing means, the feature vector Xat each time window, and the road face feature vector Yare set at vibration levels in a frequency band of 500 Hz or higher which is extracted from the time series waveform at each time window.SELECTED DRAWING: Figure 8
【課題】カーネル関数の計算に使用する特徴量を適切に選択することで、DRY/WETの2路面判別の精度を確保しつつ、計算量を少なくして計算速度を向上させる。【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、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られたタイヤ振動の時系列波形から算出された時間窓毎の特徴ベクトルである路面特徴ベクトルYAjとからカーネル関数KAを算出する際に、前記時間窓毎の特徴ベクトルXiと前記路面特徴ベクトルYAjとを、前記時間窓毎の時系列波形から抽出される500Hz以上の周波数帯域の振動レベルとした。【選択図】図8
ROAD STATE DISCRIMINATION METHOD AND ROAD STATE DISCRIMINATION DEVICE
路面状態判別方法及び路面状態判別装置
2019-01-10
Patent
Electronic Resource
Japanese
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / G01W METEOROLOGY , Meteorologie |
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