Power plants – Pressure fluid source and motor – Having correlated or joint actuation of controller of input...
Reexamination Certificate
2004-08-06
2008-12-30
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Having correlated or joint actuation of controller of input...
C060S431000
Reexamination Certificate
active
07469535
ABSTRACT:
A hydraulic operation controlling unit where the engine can be driven stably at a target output torque point and reduction in the work speed can be prevented at the time of light load, includes an engine control unit controlling the output of an engine, so that the output properties of the engine become equi-horsepower properties or approximately equi-horsepower properties in a predetermined engine speed range (N2to N6) that includes engine speed N3, which corresponds to a matching point M3. A controlling unit increases or reduces the absorbing torque of a hydraulic pump in response to an increase or decrease in the engine speed, and thus, controls the absorbing torque of the hydraulic pump so as to make the output torque T3of the engine, which corresponds to matching point M3, and the absorbing torque of the hydraulic pump coincide with each other.
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Japanese Office Action (and English translation thereof) dated Aug. 26, 2008, issued in a counterpart Japanese Application.
Frishauf Holtz Goodman & Chick P.C.
Komatsu Ltd.
Leslie Michael
LandOfFree
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