초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A control device in an electric vehicle, the control device including a battery, an inverter for converting a DC current output by the battery into an AC current, a traveling motor driven by the AC current output by the inverter, a capacitor connected in parallel to the i

[ What is claimed is:] [1.] A control device in an electric vehicle, the control device including a battery, an inverter for converting a DC current output by the battery into an AC current, a traveling motor driven by the AC current output by the inverter, a capacitor connected in parallel to the inverter, and a control means for switching an operation of said inverter in response to a signal indicative of an operation of the electric vehicle, said control device further comprising:a charging means for charging said capacitor;a voltage detecting means for detecting a voltage of said capacitor; anda deterioration determining means for determining deterioration of said capacitor based on a variation in voltage of said capacitor detected by said voltage detecting means a) during operation of said charging means and b) prior to traveling of said electric vehicle.