PROBLEM TO BE SOLVED: To provide a power supply voltage abnormality determination device that is able to determine whether or not the abnormality cause of the voltage decrease of a load circuit is an abnormality due to short circuit of the load circuit.SOLUTION: A microcomputer (power supply voltage abnormality determination device) 43 monitors a load circuit voltage Vand a signal circuit voltage Vin a load drive system in which a power supply voltage is applied to a load circuit and a signal circuit from the same battery. When the load circuit voltage value Vdecreases below a determination threshold value, an abnormality detecting section 60 detects that a load circuit voltage decrease is abnormal. When it is detected that the load circuit voltage decrease is abnormal and in a case where an amount of signal circuit voltage change ΔV, is equal to or larger than a threshold value on the basis of the amount of signal circuit voltage change ΔV, which is the difference between a signal circuit voltage value before abnormality detection V_tr_pd, and a signal circuit voltage value after the abnormality detection V, an abnormality determining section 80 determines that the load circuit is abnormal due to short circuit. In a case where the amount of signal circuit voltage change ΔV, is smaller than a threshold value, it is determined that a power supply line of the load circuit is abnormal due to disconnection or that a voltage has decreased instantly.SELECTED DRAWING: Figure 2

    【課題】負荷回路電圧低下の異常原因が負荷回路のショート異常であるか否かを判別可能な電源電圧異常判定装置を提供する。【解決手段】マイコン(電源電圧異常判定装置)43は、同一のバッテリから負荷回路及び信号回路に電源電圧が印加される負荷駆動システムにおいて、負荷回路電圧VLC及び信号回路電圧VSCを監視する。異常検出部60は、負荷回路電圧値VLCが判定閾値よりも低下したとき、「負荷回路電圧低下状態の異常」を検出する。異常判別部80は、負荷回路電圧低下状態の異常が検出されたとき、異常検出前信号回路電圧値VSC_tr_pdと異常検出後の信号回路電圧値VSCとの差分である信号回路電圧変化量ΔVSCに基づき、信号回路電圧変化量ΔVSCが閾値以上の場合に「負荷回路のショート異常」であると判定し、信号回路電圧変化量ΔVSCが閾値未満の場合に「負荷回路の電源ライン断線異常又は瞬時電圧低下」であると判定する。【選択図】図2


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    Title :

    POWER SUPPLY VOLTAGE ABNORMALITY DETERMINATION DEVICE


    Additional title:

    電源電圧異常判定装置


    Contributors:
    KOSE RYUTA (author) / SUZUKI HARUO (author)

    Publication date :

    2017-12-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / B62D MOTOR VEHICLES , Motorfahrzeuge



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