Title:
FLUID FLOW CONTROL APPARATUS FOR HYDRAULIC PUMP OF CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2010/071344
Kind Code:
A1
Abstract:
The present invention provides a flow control apparatus for a hydraulic pump of a construction machine, comprising: pressure sensor (80) for outputting pressure signals for a variety of control signal input values of the construction machine; shuttle block (70) which divides hydraulic lines (81) connected to pressure sensor (80) into two groups, and which includes a plurality of shuttle valves (70a, 70b) for extracting pressurized oil of the hydraulic line having the highest pressure from among the hydraulic lines (81) of each group; assistant pressure sensors (60a, 60b) for detecting the pressure of the pressurized oil discharged from shuttle block (70); electromagnetic proportional valves (40a, 40b), the degrees of opening of which are adjusted in accordance with the applied signals to control the fluid flow applied to signal lines (33a, 33b), and thus control the discharge rate of main pumps (P1, P2); and control unit (50) which controls the electromagnetic proportional valves (40a, 40b) such that the degrees of opening of the electromagnetic proportional valves (40a, 40b) can be adjusted in accordance with the sizes of the pressure signals when the pressure signals are applied from pressure sensor (80). Control unit (50) controls the degrees of opening of the electromagnetic proportional valves (40a, 40b) in accordance with the sizes of the signals output from the assistant pressure sensors (60a, 60b) if pressure sensor (80) is determined to have an abnormality.
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Inventors:
YUN HONG CHEOL (KR)
PARK DUC WOO (KR)
PARK DUC WOO (KR)
Application Number:
PCT/KR2009/007499
Publication Date:
June 24, 2010
Filing Date:
December 15, 2009
Export Citation:
Assignee:
DOOSAN INFRACORE CO LTD (KR)
YUN HONG CHEOL (KR)
PARK DUC WOO (KR)
YUN HONG CHEOL (KR)
PARK DUC WOO (KR)
International Classes:
F15B11/02; F15B7/00; F15B20/00
Foreign References:
| JPH0885974A | 1996-04-02 | |||
| KR0120281B1 | 1997-10-22 | |||
| JP2003239908A | 2003-08-27 | |||
| JP2004535326A | 2004-11-25 | |||
| KR920006546B1 | 1992-08-08 |
Other References:
See also references of EP 2378134A4
None
None
Attorney, Agent or Firm:
HAM, Hyun-Kyung (KR)
함현경 (KR)
함현경 (KR)
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