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Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE HAVING ELECTRONIC HYDRAULIC PUMP
Document Type and Number:
WIPO Patent Application WO/2012/102488
Kind Code:
A3
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 (2 Hanhwa 2-Cha Apt, Sangok-dong Bupyeong-gu, Incheo 403-020, 403-020, KR)
임현식 (인천시 부평구 산곡동 한화2차 아파트 217동 1804호, 403-020 Incheo, 403-020, KR)
Application Number:
KR2011/010081
Publication Date:
October 18, 2012
Filing Date:
December 26, 2011
Export Citation:
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Assignee:
DOOSAN INFRACORE CO., LTD. (7-11, Hwasu-dong Dong-gu, Incheon 401-020, 401-020, KR)
두산인프라코어 주식회사 (인천광역시 동구 화수동 7-11번지, 401-020 Incheon, 401-020, KR)
LIM, Hyun Sik (2 Hanhwa 2-Cha Apt, Sangok-dong Bupyeong-gu, Incheo 403-020, 403-020, KR)
International Classes:
F15B13/042; E02F9/22; F15B9/08
Foreign References:
JP2000282515A2000-10-10
JPH06213205A1994-08-02
KR20100134332A2010-12-23
JP2006162058A2006-06-22
Other References:
See also references of EP 2669529A4
Attorney, Agent or Firm:
KIM, Kee-Hyo (14F, Kukdong Building 60-1,Chungmuro3-ka, Chung-ku, Seoul 100-705, 100-705, KR)
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Claims: