Power plants – Pressure fluid source and motor – Having correlated or joint actuation of controller of input...
Reexamination Certificate
2005-10-05
2009-06-09
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Having correlated or joint actuation of controller of input...
C060S431000, C060S452000
Reexamination Certificate
active
07543448
ABSTRACT:
A computing section computes a reference revolution-speed decrease modification amount DNLR; and multiplies an engine revolution speed modification gain KNL by a reference revolution-speed decrease modification amount DNL and then DNLR, to thereby compute an engine revolution-speed decrease modification amount DND based on input change of an operation pilot pressure, which is modified in accordance with DNLR. At the time when a lever operation input from an operation command unit is changed from full stroke to half stroke, if a pump delivery pressure is in a pressure range of a pump absorption torque control region Y where the pump delivery pressure is lower than that in a region X, the reference revolution-speed decrease modification amount computing section700vcomputes the modification amount DNLR to be 0, and therefore lowering of a target engine revolution speed with auto-acceleration control is not caused.
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Ariga Nobuei
Ishikawa Kouji
Karasawa Hideo
Nakamura Kazunori
Okano Yasuo
Hitachi Construction Machinery Co. Ltd.
Leslie Michael
Mattingly & Malur, P.C.
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