| 摘要 |
An output current of a DC/DC converter which serves as a step-down device for charging the low-voltage electric storage device is detected. Based on the detected output current and the efficiency of the DC/DC converter, the electric power consumed by an auxiliary equipment load that is connected parallel to the low-voltage electric storage device is controlled to make the efficiency of the DC/DC converter equal to or greater than a prescribed efficiency, so that the low-voltage electric storage device can be charged from a high-voltage electric storage device or an external power supply.
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