Fluid handling – Systems – Supply and exhaust
Reexamination Certificate
2005-03-24
2008-08-05
Rivell, John (Department: 3753)
Fluid handling
Systems
Supply and exhaust
C091S433000, C700S282000
Reexamination Certificate
active
07406982
ABSTRACT:
A hydraulic system has an electrohydraulic valve that controls flow of fluid to operate a hydraulic actuator, such as a cylinder or motor. A set of characterization data is provided which describes performance of the electrohydraulic valve as a function of changes in differential pressure across that valve. The hydraulic system is operated by specifying desired movement of the hydraulic actuator and in response deriving a desired valve flow coefficient which designates a level of fluid flow through the electrohydraulic valve. A compensated control signal is produced from the desired valve flow coefficient and the characterization data, to counter act effects that changes in differential pressure have on flow of fluid. The electrohydraulic valve is activated in response to the compensated control signal.
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Pfaff Joseph L.
Tabor Keith A.
Haas George E.
HUSCO International Inc.
Quarles & Brady
Rivell John
Schneider Craig M
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