Invention Grant
US07048515B2 Hydraulic drive system and method using a fuel injection control unit
有权
液压驱动系统及使用燃料喷射控制单元的方法
- Patent Title: Hydraulic drive system and method using a fuel injection control unit
- Patent Title (中): 液压驱动系统及使用燃料喷射控制单元的方法
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Application No.: US10344120Application Date: 2002-06-20
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Publication No.: US07048515B2Publication Date: 2006-05-23
- Inventor: Hirokazu Shimomura , Tomohiko Yasuda
- Applicant: Hirokazu Shimomura , Tomohiko Yasuda
- Applicant Address: JP Tokyo
- Assignee: Hitachi Construction Machinery Co., Ltd.
- Current Assignee: Hitachi Construction Machinery Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Mattingly, Stanger, Malur & Brundidge, P.C.
- Priority: JP2001-188357 20010621; JP2002-14357 20020123
- International Application: PCT/JP02/06138 WO 20020620
- International Announcement: WO03/001067 WO 20030103
- Main IPC: F04B49/08
- IPC: F04B49/08

Abstract:
A fuel injection control unit, including an electronic governor and a controller for an engine performs control in a governor region based on an isochronous characteristic. A working machine controller receives a delivery pressure signal P and controls a regulator such that, when the delivery pressure of a hydraulic pump exceeds a predetermined pressure P1, the displacement of the hydraulic pump does not exceed a value decided in accordance with a preset pump absorption torque curve. The working machine controller controls the regulator such that, when the delivery pressure of the hydraulic pump 2 is not higher than the predetermined pressure P1, the displacement of the hydraulic pump is increased as the delivery pressure of the hydraulic pump lowers from the predetermined pressure P1.
Public/Granted literature
- US20030156949A1 Hydraulic driving unit for working machine, and method of hydraulic drive Public/Granted day:2003-08-21
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