| 摘要 |
PROBLEM TO BE SOLVED: To improve use efficiency of regenerative power, and to downsize a battery and an engine-driving electric generator. SOLUTION: A boom-driving electric generator 39 rotated by regenerating pressurized oil of a boom cylinder 7, an engine-driving electric generator 12 rotated by an engine 11, and a rotation-driving electric generator 21 capable of regenerative operation and power operation are respectively connected to the battery 19 via inverters 41, 18, 20. Further, a drive controlling section 33 is provided to shift the engine-driving electric generator 12 to the power operation upon regenerative operation of the boom-driving electric generator 39 and/or the rotation-driving electric generator 21. The difference between the rotation power energy and the rotation regenerative energy in the rotation-driving electric generator 21 is supplied by the boom regenerative energy of the boom-driving electric generator 39. COPYRIGHT: (C)2011,JPO&INPIT
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