DETERIORATION DISCRIMINATING DEVICE FOR CAPACITOR IN MOTOR-DRIVEN VEHICLE

摘要

PURPOSE: To discriminate the deterioration of a smoothing capacitor provided at the inverter of a motor-driven vehicle without detaching the capacitor. CONSTITUTION: The smoothing capacitor 27 of an inverter 6 is charged with a precharger contactor 22 turned on before turning on a motor contactor 21. The increasing rate of the voltage of the capacitor 27 is detected by a voltage sensor S2. If the increasing rate exceeds a prescribed value, it is discriminated as the capacitor 27 deteriorated. The capacitor 27 of the inverter 6 is discharged with a discharge contactor 24 turned on after turning off the motor contactor. If the increasing rate of the voltage of the capacitor 27 detected by the voltage sensor S2 exceeds a prescribed value, it is discriminated that the capacitor 27 has deteriorated.