| 摘要 |
PROBLEM TO BE SOLVED: To decide defective discharging of a capacitor provided in the inverter of an electric automobile and to determine the cause thereof surely. SOLUTION: If the capacitor voltage VCON drops below a specified level VREF (200V) at step 5 upon elapsing a first predetermined time T1 (40sec) at step 4 after a main contactor is turned on at step 3, a decision is made that the main contactor and a discharge circuit are normal at step 6. If the capacitor voltage VCON drops below the specified level VREF for the first time at step 8 upon elapsing a second predetermined time T2 (5min) at step 7, a decision is made that the discharge circuit failed and a discharge resistor is discharged at step 9. If the capacitor voltage VCON is higher than the specified level VREF at step 8, a decision is made that the main contactor failed and locked to an ON state. |
