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.
METHOD FOR ESTIMATING ROAD SURFACE CONDITION
VERFAHREN ZUR ERMITTLUNG DES ZUSTANDS EINES STRASSENBELAGS
PROCÉDÉ D'ESTIMATION DE L'ÉTAT DE LA SURFACE D'UNE ROUTE
2018-10-10
Patent
Electronic Resource
English
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 |