Invention Grant
- Patent Title: HYDRAULIC PUMP CONTROL DEVICE AND CONTROL METHOD FOR CONSTRUCTION MACHINERY
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Application No.: EP10831746.2Application Date: 2010-11-01
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Publication No.: EP2503067B1Publication Date: 2018-10-03
- Inventor: BANG, Jae Seok , JUNG, Woo Yong , SOHN, Won Sun
- Applicant: Doosan Infracore Co., Ltd.
- Applicant Address: 7-11 Hwasu-dong Dong-gu Incheon 401-020 KR
- Assignee: Doosan Infracore Co., Ltd.
- Current Assignee: Doosan Infracore Co., Ltd.
- Current Assignee Address: 7-11 Hwasu-dong Dong-gu Incheon 401-020 KR
- Agency: Isarpatent
- Priority: KR20090111498 20091118
- International Announcement: WO2011062379 20110526
- Main IPC: F04B1/32
- IPC: F04B1/32 ; F04B49/00 ; F04B49/06 ; F04B49/08 ; F04B23/06 ; E02F9/12 ; E02F9/22 ; F15B11/17
Abstract:
The present invention relates to a device for controlling a hydraulic pump of construction machinery. The device has a first pump (10) supplying working fluid through a swing control valve (31) to a swing motor (30), and a second pump (20) supplying working fluid through a work tool control valve (41) to a work tool actuator (40), and includes: a first tilting angle control unit (12) for controlling a discharge flow of the first pump (10) by controlling a tilting angle of the first pump (10) according to an input pump control signal; and a controller (60) deducting a discharge pressure (P2) of the second pump (20) from a discharge pressure (P1) of the first pump (10) to calculate a pump difference pressure (P1-P2), comparing the calculated pump difference pressure (P1-P2) to a reference difference pressure and, when the calculated pump difference pressure (P1-P2) is greater than the reference difference pressure, outputting the pump control signal to the first tilting angle control unit (12) to make the discharge pressure (P1) of the first pump (10) equal to or less than a first reference pressure that is less than or equal to a swing relief pressure.
Public/Granted literature
- EP2503067A2 HYDRAULIC PUMP CONTROL DEVICE AND CONTROL METHOD FOR CONSTRUCTION MACHINERY Public/Granted day:2012-09-26
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