Power plants – Pressure fluid source and motor – Methods of operation
Reexamination Certificate
2005-11-22
2005-11-22
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Methods of operation
C060S329000, C060S445000
Reexamination Certificate
active
06966180
ABSTRACT:
A control arrangement for a hydraulic system is disclosed. The system comprises a variable displacement hydraulic pump (4), which is connected with a hydraulic drive motor (16) by a supply line (11) and a return line (12). The system also includes a pump controller (4a) which is adapted to vary the displacement of the pump (4). The control arrangement includes a first feedback element in the form of an oil temperature sensor (19), which provides the pump controller (4a) feedback of the evolution of the oil temperature. The pump controller (4a) is adapted in vary the displacement of the pump (4) in response to said feedback. A second feedback element is constituted by a pressure limiter valve (15c), which provides to the pump controller (4a) feedback of the pressure in at least a feedback portion (12a) of the return line (12).
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Deneir Stephan P. G.
Young Steven C.
CNH America LLC
Hanan Devin
Henkel Rebecca
Look Edward K.
Maurer Brant T.
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