| 摘要 |
<P>PROBLEM TO BE SOLVED: To determine the drop point in the insulation resistance, without fail. <P>SOLUTION: A drop in insulation resistance, which has occurred in one of power systems, is detected by using a voltage difference in a junction between a voltage, applied to a junction between the negative electrode terminal of a master battery and a system main relay, and an acted voltage, and a value 1 is set to an insulation resistance drop detection flag F1. Then, when the value 1 is set to the insulation resistance drop detection flag F1, in a state where the system main relay on the side of a slave battery is OFF (S210), a boosting circuit on the master side is kept in a gate OFF state, whether the operation of the boosting circuit on the master side is requested or not (S220); and by using a junction point voltage difference at the junction at inverter OFF stoppage, it is determined whether the drop point in the insulation resistance of an electrical system is at a motor system located farther to the motor side than to the inverter (S260-S330). <P>COPYRIGHT: (C)2011,JPO&INPIT |
