| 摘要 |
PROBLEM TO BE SOLVED: To provide a power reception device which detects an obstacle between a power supply device and the power reception device before completing entrance, and to provide obstacle detection means.SOLUTION: A vehicle side control unit 154 reads the power supply efficiency variation pattern, in a state where there is no obstacle, stored in a power supply efficiency variation pattern storage unit 153, calculates the value, obtained by subtracting a sampled power supply efficiency kfrom the power supply efficiency kpof a power supply efficiency variation pattern thus read, as an error &Dgr;of power supply efficiency, every time when the power supply efficiency kis sampled, performs threshold determination of the total sum &Dgr;of the error &Dgr;thus calculated and a predetermined threshold &Dgr;prepared previously for each sampling number, and determines that an obstacle is detected at the timing when the total sum &Dgr;of error exceeds the threshold &Dgr;. |
