CONSTRUCTION MACHINE

To provide a construction machine which appropriately controls charging rate of a power storage device to suppress deterioration of the power storage device.SOLUTION: In a construction machine with a work device driven by pressure oil to be discharged from a hydraulic pump driven by an electric moto...

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Bibliographische Detailangaben
Hauptverfasser: ISHIDA SEIJI, NAYA ITARU
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a construction machine which appropriately controls charging rate of a power storage device to suppress deterioration of the power storage device.SOLUTION: In a construction machine with a work device driven by pressure oil to be discharged from a hydraulic pump driven by an electric motor, it comprises: a power storage device which stores power; an external power supply device which supplies power from the outside of the construction machine; and a power converter which performs at least one of a power storage device operation for driving the electric motor by the power stored in the power storage device and an external power supply operation for driving the electric motor by the power to be supplied via the external power supply device, drives the electric motor by the power storage device operation or the external power supply operation when charging rate of the power storage device is a preset value or more, and drives the electric motor only by the external power supply operation when the charging rate of the power storage device is the preset value or less in a state in which supply of external power by the external power supply device is allowed.SELECTED DRAWING: Figure 4 【課題】蓄電装置の充電率適切に制御して蓄電装置の劣化を抑制することができる建設機械を提供すること。【解決手段】電動モータにより駆動される油圧ポンプから吐出される圧油で駆動される作業装置とを備えた建設機械において、電力を蓄電する蓄電装置と、建設機械の外部から電力を供給する外部電力供給装置と、蓄電装置に蓄えられた電力により電動モータを駆動する蓄電装置稼働と外部電力供給装置を介して供給される電力により電動モータを駆動する外部給電稼働の少なくとも一方を行う電力変換器とを備え、外部電力供給装置による外部電力の供給が可能な状態において、蓄電装置の充電率が予め設定された値以上である場合には、蓄電装置稼働、又は、外部給電稼働により電動モータを駆動し、蓄電装置の充電率が予め設定された値より小さい場合には、外部給電稼働のみにより電動モータを駆動する。【選択図】 図4