Patent ID: 9376785
Filing Date: 2016-06-28
CPC Classification: E02F,H02J

Claim Text:
1. A shovel, comprising: a lower traveling body; an upper rotating body provided on the lower traveling body; an electrical energy storage device provided on the upper rotating body; a converter connected to the electrical energy storage device; a status detector that detects a status value representing a status of the electrical energy storage device; and a controller that controls the converter to perform charge or discharge control of the electrical energy storage device at the time of starting up the shovel, wherein the controller applies a current to the electrical energy storage device and the converter at the time of starting up the shovel, calculates the status value after having applied the current, compares the detected status value with a predetermined value, and controls the converter based on a comparison result to restrict an output of the electrical energy storage device, the status value is a value of an internal resistance of the electrical energy storage device that is calculated based on a current value or a voltage value of the electrical energy storage device, the current value and the voltage value being detected by the status detector when the current is applied to the electrical energy storage device and the converter at the time of starting up the shovel, the controller restricts the output of the electrical energy storage device such that a charge/discharge current of the electrical energy storage device becomes lower when the calculated value of the internal resistance becomes higher, and such that the voltage value does not exceed an upper limit voltage and does not fall below a lower limit voltage, and the controller continues to restrict the output of the electrical energy storage device until the calculated value of the internal resistance becomes the predetermined value.