The invention provides a method and apparatus capable of accurately estimating a road surface condition under a traveling vehicle using unsprung acceleration and wheel speed data. The unsprung fore-aft acceleration (Gx) is detected by an acceleration sensor (11) attached to a knuckle (31) which is an unsprung component of a vehicle. At the same time, the wheel speed (Vw) is detected and the variation (Vw) in wheel speed is calculated. Then the fluctuation range (Ã(Vw)) of the variation in wheel speed and the fluctuation range (Ã(Gx)) of the unsprung fore-aft acceleration are calculated. And whether the road surface is a rough road surface with some bumpiness or a flat (smooth) road surface is estimated from a relationship between the fluctuation range (Ã(Vw)) of the variation in wheel speed and the fluctuation range (Ã(Gx)) of the unsprung fore-aft acceleration.


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    Title :

    ROAD SURFACE CONDITION ESTIMATION METHOD, AND ROAD SURFACE CONDITION ESTIMATION DEVICE


    Additional title:

    VERFAHREN ZUR BEURTEILUNG DES STRASSENOBERFLÄCHENZUSTANDS UND VORRICHTUNG ZUR BEURTEILUNG DES STRASSENOBERFLÄCHENZUSTANDS
    PROCÉDÉ D'ÉVALUATION DE L'ÉTAT DE LA SURFACE DE ROUTE, DISPOSITIF D'ÉVALUATION DE L'ÉTAT DE LA SURFACE DE ROUTE


    Contributors:

    Publication date :

    2020-09-02


    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



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