| 摘要 |
A charge accumulating circuit (90) accumulates regeneration power. The charge accumulating circuit includes a DC bus line (110) which is connected to a smoothing capacitor (105), a charge accumulating capacitor (19) with an internal resistance (Rc), and a converter (100) which connects the DC bus line and the charge accumulating capacitor to each other, and performs a charge/discharge operation. The control device (30) changes the OFF state of the first switch to the ON state when the start key (32) is turned on, measures a physical quantity involved with a discharge characteristic of the charge accumulating capacitor, and calculates at least one of the internal resistance and a capacitance (Cc) of the charge accumulating capacitor on the basis of a measurement result. |
