Title:
APPARATUS AND METHOD FOR CONTROLLING A HYDRAULIC PUMP OF A CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2011/078543
Kind Code:
A2
Abstract:
The present invention relates to an apparatus and method for controlling a hydraulic pump of a construction machine. The disclosed apparatus of the present invention comprises: a pump control unit which controls a discharge pressure of the hydraulic pump driven by an engine, wherein the pump control unit includes a set pressure value calculation unit which calculates a set pressure value on the basis of an engine output torque estimation value or an engine RPM; and a failure- handling unit which selects either the set pressure value and a pressure instruction value in accordance with whether or not failures of a swash plate angle sensor have occurred, and outputs the selected value. According to the present invention, the set pressure value is calculated on the basis of the engine output torque estimation value, and the pump is controlled in accordance with the calculated set pressure value. Thus, it is possible to prevent a suction torque value of the pump from exceeding the maximum torque value of the engine even upon the occurrence of failures in the swash plate angle sensor, thereby preventing engine stall even upon the occurrence of failures in the swash plate angle sensor in a high-load work condition of the engine.
Inventors:
JUNG, Woo Yong (3-1506, Jung-ang Heights Apt.Guro 1-dong, Guro-gu, Seoul 152-762, 152-762, KR)
Application Number:
KR2010/009140
Publication Date:
June 30, 2011
Filing Date:
December 21, 2010
Export Citation:
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)
두산인프라코어 주식회사 (인천광역시 동구 화수동 7-11번지, 401-020 Incheon, 401-020, KR)
International Classes:
E02F9/22; E02F9/24; F04B27/04; F04B27/18
Attorney, Agent or Firm:
KIM, Kee Hyo et al. (14F, Kukdong Building 60-1,Chungmuro3-ka, Chung-ku, Seoul 100-705, 100-705, KR)