A time-series waveform of tire vibration detected by an acceleration sensor is windowed by a windowing means, time-series waveforms of the tire vibration are extracted for respective time windows, and feature vectors of the respective time windows are calculated. Then kernel functions are calculated from the feature vectors of the respective time windows and road surface feature vectors, which are the feature vectors for the respective time windows calculated from the time-series waveform of the tire vibration obtained for distinctive road surface conditions calculated in advance. And the road surface condition is determined by comparing values of discriminant functions using the kernel functions. As a result, the road surface condition can be determined from the time-series waveform of the tire vibration without detecting peak positions or measuring the wheel speed. Moreover, robustness against changes in tire size can be added to the determination of the road surface condition.


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    Title :

    METHOD AND DEVICE FOR DETERMINING STATE OF ROAD SURFACE


    Additional title:

    VERFAHREN UND VORRICHTUNG ZUM BESTIMMEN DES ZUSTANDS EINER STRASSENOBERFLÄCHE
    PROCÉDÉ ET DISPOSITIF POUR DÉTERMINER UN ÉTAT DE SURFACE DE ROUTE


    Contributors:

    Publication date :

    2018-12-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    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 / B60C VEHICLE TYRES , Fahrzeugreifen / G01W METEOROLOGY , Meteorologie



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