HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE INCLUDING EMERGENCY CONTROL UNIT FOR ELECTRIC HYDRAULIC PUMP

Title:

HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE INCLUDING EMERGENCY CONTROL UNIT FOR ELECTRIC HYDRAULIC PUMP

Document Type and Number:

WIPO Patent Application WO/2012/087012

Kind Code:

A3

Abstract:

The present invention relates to a hydraulic system for a construction machine which uses an electric hydraulic pump, and more particularly, to a hydraulic system including an emergency control unit for temporarily operating the construction machine when an electric unit for controlling the electric hydraulic pump fails to operate. To this end, disclosed is the hydraulic system comprising the electric hydraulic pump, the electric control unit for controlling the electric hydraulic pump, and the emergency control unit, which operates when the electric control unit fails to operate, so as to temporarily control the electric hydraulic pump in accordance with to a pre-set condition, which can effectively respond to a low load work corresponding to a predetermined pressure (P1) and to a high load work corresponding to a higher pressure (P2), by the emergency control unit operating according to different optional conditions, based on the load (low load, high load) of the working machine that is required when the electric control unit fails to operate.

Inventors:

SHIN JUNG MUG (KR)
PARK DUCK WOO (KR)
JUNG WOO YONG (KR)

Application Number:

PCT/KR2011/009907

Publication Date:

September 07, 2012

Filing Date:

December 21, 2011

Export Citation:

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Assignee:

DOOSAN INFRACORE CO LTD (KR)
SHIN JUNG MUG (KR)
PARK DUCK WOO (KR)
JUNG WOO YONG (KR)

International Classes:

F15B13/042; E02F9/22; F15B20/00

Foreign References:

KR970015340A	1997-04-28
JP2003247511A	2003-09-05
KR20100075300A	2010-07-02
JP2008302787A	2008-12-18

Other References: