| 摘要 |
Before a motor contactor is turned ON, a pre-charge contactor is turned ON to charge a smoothing capacitor of an inverter. During this time, an increased rate of voltage of the capacitor is detected by a voltage sensor. When the increased rate exceeds a predetermined value, it is determined that the capacitor has deteriorated. After turning-OFF the motor contactor, a discharge contactor is turned ON, and the capacitor of the inverter is discharged. During this time, a decreased rate of voltage of the capacitor is detected by the voltage sensor. When the decreased rate exceeds a predetermined value, it is determined that the capacitor has deteriorated. Thus, it is possible to determine the deterioration of the smoothing capacitor mounted in the inverter in an electric vehicle without removing of the capacitor from the inverter.
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