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Title:
DEVICE FOR CONTROLLING FLOW OF HYDRAULIC PUMP FOR CONSRUCTION MACHINE, AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2016/114411
Kind Code:
A1
Abstract:
Disclosed are: a device for controlling the flow of a hydraulic pump so as to prevent the generation of cavitation due to the weight of an operation device such as a bucket when the operation device is operated; and a control method therefor. The present invention relates to a device for controlling flow, and provides a device for controlling the flow of a hydraulic pump for a construction machine, the device comprising: first and second hydraulic pumps; a first operation lever; a control valve provided on the flow path of the first hydraulic pump; a hydraulic cylinder operating by hydraulic oil of the second hydraulic pump; an operation device control valve provided on the flow path of the second hydraulic pump; a joining path for making hydraulic oil of the first hydraulic pump join hydraulic oil supplied to the hydraulic cylinder when changing the state of the control valve; first, second and third pressure sensors for sensing the hydraulic oil pressure of the first and second hydraulic pumps and the pilot pressure generated due to the operation of the first operation lever; first and second regulators for adjusting swivel angles of swash plates of the first and second hydraulic pumps; and a controller for controlling a discharge flow of the first hydraulic pump by using a difference between the detected hydraulic oil pressure of the first hydraulic pump and preset control pressure.

Inventors:
LEE SANG-HEE (KR)
LEE JAE-HOON (KR)
Application Number:
PCT/KR2015/000280
Publication Date:
July 21, 2016
Filing Date:
January 12, 2015
Export Citation:
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Assignee:
VOLVO CONSTR EQUIP AB (SE)
LEE SANG-HEE (KR)
International Classes:
E02F9/20; E02F9/22; F15B13/02
Foreign References:
JP2010286074A2010-12-24
JP2011085159A2011-04-28
JP2003176735A2003-06-27
JP2011153572A2011-08-11
KR20140074324A2014-06-17
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
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