A method capable of estimating a snowy road surface condition during vehicular travel in finer classification. In this method, tire vibrations in the circumferential direction, road surface temperature (T), and tire-generated sound are detected by an acceleration sensor, a road surface thermometer, and a microphone, respectively. Then band values P 11 , P 12 and P 13 for a pre-leading-edge region (R1), band values P 21 , P 22 and P 23 for a leading-edge region (R2), band values P 31 , P 32 and P 33 for a pre-trailing-edge region (R3), band values P 41 and P 42 for a trailing-edge region (R4), and band values P 51 , P 52 and P 53 for a post-trailing-edge region (R5) are calculated from the tire vibration data. A sound pressure level ratio (Q) = (P A /P B ) , which is the ratio of a band power value (P A ) of a low frequency band to a band power value (P B ) of a high frequency band, is calculated from data on the tire-generated sound. And a road surface condition is estimated, using the band values (P ij ), road surface temperature data (T), sound pressure level ratio (Q), and wheel speed data.


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    Title :

    METHOD FOR ESTIMATING ROAD SURFACE CONDITION


    Additional title:

    VERFAHREN ZUR ERMITTLUNG DES ZUSTANDS EINES STRASSENBELAGS
    PROCÉDÉ D'ESTIMATION DE L'ÉTAT DE LA SURFACE D'UNE ROUTE


    Contributors:

    Publication date :

    2018-10-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01W METEOROLOGY , Meteorologie / B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF / 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 / G01H MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES , Messen von mechanischen Schwingungen oder Ultraschall-, Schall- oder Infraschallwellen



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