OPERATING OIL TEMPERATURE CONTROLLER FOR HYDRAULIC DRIVE DEVICE

WIPO Patent Application WO/2011/021405

A1

In order to keep fluctuations of the operating oil temperature small, a control unit (12) for controlling a flow rate control valve (11) comprises: a first calculation means for obtaining an energy element for increasing the temperature of operating oil; a first setting means for setting a second relationship between the flow rate through an oil cooler (9) and the energy element for increasing the temperature of the operating oil, the second relationship being set corresponding to a first relationship between the flow rate through the oil cooler (9) and the heat release amount of the oil cooler (9) that are experimentally and empirically known, and being obtained by replacing the heat release amount of the oil cooler (9) in the first relationship with the energy element for increasing the temperature of the operating oil; and a second calculation means for obtaining the flow rate through the oil cooler (9) on the basis of the second relationship set by the first setting means, wherein the flow rate control valve (11) is controlled according to the flow rate through the oil cooler (9) obtained by the second calculation means.

KONDO SATOMI (JP)

PCT/JP2010/052897

February 24, 2011

February 24, 2010

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HITACHI CONSTRUCTION MACHINERY (JP)
KONDO SATOMI (JP)

E02F9/22; F15B21/0423

JP2007211843A	2007-08-23
JP2009168143A	2009-07-30
JP2006299795A	2006-11-02
JP2006084022A	2006-03-30
JP2006523808A	2006-10-19
JP3516984B2	2004-04-05

The Patent Body Corporate TAKEWA INTERNATIONAL PATENT OFFICE (JP)
Patent business corporation Takekazu international patent firm (JP)

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