Title:
METHOD FOR CONTROLLING HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/014131
Kind Code:
A1
Abstract:
Disclosed is a method for controlling a hydraulic system for minimizing a loss of pressure by expanding the open area of a joining spool if a work device such as a boom or the like operates autonomously. The present invention provides a method for controlling a hydraulic system, comprising: a first step for detecting pilot signals according to the operations of operation levers for first and second working devices by first and second pressure-sensing devices and respectively transmitting the pilot signals to a controller; a second step for determining whether the operation lever for the first working device operates autonomously; a third step for supplying second signal pressure by an electronic proportional valve to a joining spool in order to expand the open area of the joining spool with respect to the same operation pressure of the operation lever for the first working device and discharging the operation oil discharged from a second hydraulic pump, in proportion to the operation amount of the operation lever for the first working device, when the operation lever for the first working device operates more than a set section if the first working device operates alone due to the independent operation of the operation lever for the first working device; and a fourth step for supplying the second signal pressure by the electronic proportional valve to the joining spool so as to be proportional to the operation amount of the operation lever for the first working device and divisionally supplying the working oil discharged from the second hydraulic pump to the first and second working devices, if the first and second working devices operate in combination due to the simultaneous operations of the operation levers for the first and second working devices.
Inventors:
LEE SANG-HEE (KR)
Application Number:
PCT/KR2012/005652
Publication Date:
January 23, 2014
Filing Date:
July 16, 2012
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
LEE SANG-HEE (KR)
LEE SANG-HEE (KR)
International Classes:
F15B13/043; E02F9/22; F15B21/08
Foreign References:
| KR20100125960A | 2010-12-01 | |||
| KR20110072706A | 2011-06-29 | |||
| JP2005016720A | 2005-01-20 | |||
| JP2010229681A | 2010-10-14 | |||
| JP2010270910A | 2010-12-02 |
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
윤의섭 (KR)
Download PDF:
Previous Patent: FOLDABLE CONTAINER
Next Patent: BATTERY CHARGING SYSTEM FOR HYBRID CONSTRUCTION MACHINE
Next Patent: BATTERY CHARGING SYSTEM FOR HYBRID CONSTRUCTION MACHINE