| 摘要 |
A method for detecting a welding of a relay contact in a circuit having a DC power supply; a load circuit; a first main relay and a second main relay respectively inserted in a pair of power supply lines disposed between the DC power supply and the load circuit; and a precharge relay which is provided in parallel to the contact of the first main relay has the step of carrying out a sequence control to each of the relays ( 11, 12, 13 ) while measuring voltage across both ends of the load circuit ( 16 ) when shifting from a normal operation state in which a first main relay ( 11 ) and a second main relay ( 12 ) are controlled to be on and the precharge relay ( 13 ) is controlled to be off to a suspension state in which each of the relays ( 11, 12, 13 ) are controlled to be off. The welding of the relay contact of the first main relay ( 11 ) and the second main relay ( 12 ) is determined independently and separately from a correspondence between the proceeding of the sequence and the measured voltage.
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