FLOW CONTROL SYSTEM FOR A HYDRAULIC PUMP OF CONSTRUCTION MACHINERY

Title:

FLOW CONTROL SYSTEM FOR A HYDRAULIC PUMP OF CONSTRUCTION MACHINERY

Document Type and Number:

WIPO Patent Application WO/2012/002586

Kind Code:

A1

Abstract:

Disclosed is a flow control system for a hydraulic pump of construction machinery, which is capable of variably controlling the discharge flow from a hydraulic pump in accordance with load pressure that occurs at a hydraulic actuator of a boom cylinder or the like. In a flow control system for a hydraulic pump according to the present invention, after the discharge pressure of the hydraulic pump and the respective degrees of control of control levers for the respective hydraulic actuators are detected, and the average load pressures are set for each hydraulic actuator, controlling is performed to reduce the flow rate such that the discharge flow from the hydraulic pump becomes equal to the amount of load at the hydraulic actuators in the event the discharge pressure at the hydraulic pump is greater than the average load pressure at the respective hydraulic actuators, and controlling is performed such that the discharge flow at the hydraulic pump is proportional to the degrees of control in the event the discharge pressure at the hydraulic pump is less than the average load pressure at the respective hydraulic actuators.

Inventors:

JOUNG HEA-GYOON (KR)
LEE SANG-HEE (KR)
SHIN HUNG-JU (KR)

Application Number:

PCT/KR2010/004176

Publication Date:

January 05, 2012

Filing Date:

June 28, 2010

Export Citation:

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Assignee:

VOLVO CONSTR EQUIP AB (SE)
JOUNG HEA-GYOON (KR)
LEE SANG-HEE (KR)
SHIN HUNG-JU (KR)

International Classes:

F15B9/04; E02F9/22; F15B9/08; F15B13/043

Foreign References:

KR100651695B1	2006-11-30
KR930009513B1	1993-10-06
KR20020006607A	2002-01-23
JP2002326799A	2002-11-12
JP2006112280A	2006-04-27

Other References: