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Title:
PUMP TORQUE CONTROLLER OF HYDRAULIC WORKING MACHINE
Document Type and Number:
WIPO Patent Application WO/2007/060948
Kind Code:
A1
Abstract:
[PROBLEMS] To be able to regulate the pump absorption torque of a main pump in accordance with environmental conditions, or the like, when a sub-pump having properties different from those of the main pump is connected with a prime mover. [MEANS FOR SOLVING PROBLEMS] The pump torque controller comprising a processing means with a regulation switch (25) where a main controller (12) brings the absorption torque of a cooling fan pump (20) to a maximum working absorption torque, a processing means for increasing the target absorption torque for regulating a main pump (13) at a slow rate from a sufficiently low pump absorption torque, a fourth judgment means for judging whether the difference between the load rate of an engine (3) and a target load rate falls within a predetermined range or not, a processing means for repeating take-in of a load rate signal and increase of the target absorption torque for regulation while judgment result from the fourth judgment means is false, a processing means for storing the target absorption torque for regulation, and the like, as a regulation value AdjVal when judgment result from the fourth judgment means is true, and a processing means for limiting the target absorption torque operated by a torque limiting means by the regulation value AdjVal.

Inventors:
KAKIZAWA KENJI (JP)
YASUDA GEN (JP)
Application Number:
PCT/JP2006/323208
Publication Date:
May 31, 2007
Filing Date:
November 21, 2006
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
KAKIZAWA KENJI (JP)
YASUDA GEN (JP)
International Classes:
F15B11/00; E02F9/22; F02D29/04; F04B49/00
Domestic Patent References:
WO2004018877A12004-03-04
Foreign References:
JP2005233120A2005-09-02
JPH10141110A1998-05-26
JP2005188433A2005-07-14
JP2005188674A2005-07-14
JP2004132195A2004-04-30
JPH09195947A1997-07-29
JP2001140806A2001-05-22
JPH05248401A1993-09-24
JP2006112288A2006-04-27
JP2004132197A2004-04-30
JPH09126150A1997-05-13
Other References:
See also references of EP 1953392A4
Attorney, Agent or Firm:
TAKEWA INTERNATIONAL PATENT OFFICE (6-13 Nishishinbashi 1-chom, Minato-ku Tokyo 03, JP)
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