To provide a poor visibility detection device which can accurately recognize a frozen state of a vehicle window glass.SOLUTION: A freezing determination part 20 determines whether an outer surface of a vehicle window glass is frozen in a determination period or not on the basis of first lapse time during which a peripheral temperature of the vehicle window glass detected in the determination period is a freezing reference temperature or less and transition of the peripheral temperature of the vehicle window glass in the first lapse time. When it is determined by the freezing determination part that the outer surface of the vehicle window glass is frozen within the determination period, a thawing determination part 21 determines whether the outer surface of the vehicle window glass is thawed after the determination period or not on the basis of second lapse time during which the peripheral temperature of the vehicle window glass detected after the determination period exceeds the freezing reference temperature and transition of the peripheral temperature of the vehicle window glass in the second lapse time.SELECTED DRAWING: Figure 1

    【課題】車両窓ガラスの凍結状態を正確に認識することができる視界不良検出装置を提供する。【解決手段】凍結判定部20は、判定期間に検出された車両窓ガラスの周辺温度が凍結基準温度以下であった第1の経過時間および第1の経過時間における車両窓ガラスの周辺温度の遷移に基づいて、判定期間内に車両窓ガラスの外表面が凍結したか否かを判定する。解凍判定部21は、凍結判定部によって判定期間内に車両窓ガラスの外表面が凍結したと判定された場合に、判定期間の以降に検出された車両窓ガラスの周辺温度が凍結基準温度を超えた第2の経過時間および第2の経過時間における車両窓ガラスの周辺温度の遷移に基づいて、判定期間の以降に車両窓ガラスの外表面が解凍されたか否かを判定する。【選択図】図1


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    Title :

    POOR VISIBILITY DETECTION DEVICE, POOR VISIBILITY DETECTION SYSTEM, AND PROGRAM


    Additional title:

    視界不良検出装置、視界不良検出システムおよびプログラム


    Contributors:
    TOGANO YUJI (author)

    Publication date :

    2019-12-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60S SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR , Warten, Reinigen, Instandsetzen, Unterstützen, Anheben oder Rangieren von Fahrzeugen, soweit nicht anderweitig vorgesehen / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G01K MEASURING TEMPERATURE , Messen der Temperatur



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