To provide a ground fault detection device, in which a decrease in the accuracy of estimating insulating resistance is prevented even when the capacitance of a capacitor for detection has changed.SOLUTION: The ground fault detection device comprises: a switch group for switching between a first measurement path that includes a battery and a capacitor, a second measurement path that includes a battery, a negative insulating resistance, and a capacitor, and a third measurement path that includes a battery, a positive insulating resistance, and a capacitor; and a control unit for calculating a reference value on the basis of each charge voltage of capacitor in each measurement path and calculating insulating resistance referring to a prescribed conversion map. The conversion map includes a conversion map that corresponds to the capacitances of capacitors, and the control unit estimates the capacitance of a capacitor and refers to the conversion map that corresponds to the estimated capacitance of the capacitor.SELECTED DRAWING: Figure 1
【課題】地絡検出装置において、検出用コンデンサの容量が変化した場合であっても、絶縁抵抗の算出精度の低下を防ぐ。【解決手段】地絡検出装置は、バッテリ、コンデンサを含んだ第1測定経路と、バッテリ、負側絶縁抵抗、コンデンサを含んだ第2測定経路と、バッテリ、正側絶縁抵抗、コンデンサを含んだ第3測定経路と、を切り換えるスイッチ群と、各測定経路におけるコンデンサの各充電電圧に基づいて参照値を算出し、既定の換算マップを参照して絶縁抵抗を算出する制御部と、を備え、換算マップは、コンデンサの容量に対応した換算マップを含み、制御部は、コンデンサの容量を推定し、推定された前記コンデンサの容量に対応した換算マップを参照する。【選択図】図1
GROUND FAULT DETECTION DEVICE
地絡検出装置
13.12.2022
Patent
Elektronische Ressource
Japanisch