| CPC B60W 10/26 (2013.01) [B60K 6/28 (2013.01); B60W 2710/244 (2013.01)] | 16 Claims |
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1. A contactor failure determination apparatus mounted to a vehicle including a battery that includes a positive electrode terminal and a negative electrode terminal, a first circuit that includes an inverter and a motor, a first main contactor that makes or interrupts electrical connection between the first circuit and one of the positive electrode terminal and the negative electrode terminal, a second main contactor that makes or interrupts electrical connection between the first circuit and the other of the positive electrode terminal and the negative electrode terminal, and a pre-charge contactor that is disposed in parallel with the first main contactor and makes or interrupts the electrical connection between the first circuit and the one terminal, the contactor failure determination apparatus comprising:
a second circuit that includes an external charger configured to supply electric power from an external power supply to the battery so as to charge the battery;
a pair of external charging contactors that make or interrupt electrical connection between negative-electrode sides of the first circuit and the second circuit and between positive-electrode sides of the first circuit and the second circuit;
a voltage sensor configured to detect rising or dropping of a voltage of the second circuit; and
a controller that executes an external charging preparation control for opening the first main contactor, the second main contactor, the pre-charge contactor, and each of the external charging contactors after a stop of the vehicle, and in response to a request to start external charging for charging the battery by the external power supply being made, bringing the contactors into a state where each of the main contactors and each of the external charging contactors are closed and the pre-charge contactor is opened before a start of power supply from the external power supply to the external charger, wherein
electrical resistance between the terminal and the first circuit via the pre-charge contactor is set to be higher than electrical resistance between the terminal and the first circuit via the first main contactor,
when executing the external charging preparation control, the controller executes a first control for closing each of the external charging contactors, executes a second control for closing the pre-charge contactor after execution of the first control, executes a third control for closing the second main contactor after execution of the second control, and in response to the voltage sensor detecting that the voltage of the second circuit has not risen after execution of the third control, determines that at least one of the external charging contactors has failed in an open state, and
the controller closes the external charging contactors simultaneously, then the pre-charge contactor, and then the second main contactor in this order.
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