Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE HAVING ELECTRONIC HYDRAULIC PUMP
Document Type and Number:
WIPO Patent Application WO/2012/102488
Kind Code:
A2
Abstract:
The present invention pertains to a hydraulic system for a construction machine having an electronic hydraulic pump. More specifically, the hydraulic system temporarily drives the construction machine when the operation of the electronic control section that controls an electronic hydraulic pump is abnormal, particularly, when the electronic control section is uncontrollable because the operative amount of a joystick is not transmitted to the electronic control section. To this end, the electronic control section operates a center bypass valve so as to convert the entire system to an open type, sets neutral mode entry conditions (for example, keeping the maximum flow rate under a predetermined pressure for a predetermined time) and neutral mode departure conditions so as to recognize the neutral state of the joystick, recognizes the neutral state of the joystick using the same, and carries out the predetermined tilting angle control of a swash plate.
Inventors:
LIM HYUN SIK (KR)
JUNG WOO YONG (KR)
JUNG WOO YONG (KR)
Application Number:
PCT/KR2011/010081
Publication Date:
August 02, 2012
Filing Date:
December 26, 2011
Export Citation:
Assignee:
DOOSAN INFRACORE CO LTD (KR)
LIM HYUN SIK (KR)
JUNG WOO YONG (KR)
LIM HYUN SIK (KR)
JUNG WOO YONG (KR)
International Classes:
F15B13/042; E02F9/22; F15B9/08
Foreign References:
| JP2000282515A | 2000-10-10 | |||
| JPH06213205A | 1994-08-02 | |||
| KR20100134332A | 2010-12-23 | |||
| JP2006162058A | 2006-06-22 |
Other References:
None
See also references of EP 2669529A4
See also references of EP 2669529A4
Attorney, Agent or Firm:
KIM, Kee-Hyo (KR)
김기효 (KR)
김기효 (KR)
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Claims: