Hydraulic system control method using a differential pressure compensated flow coefficient
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United States of America Patent
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-
Aug 5, 2008
Grant Date -
Sep 29, 2005
app pub date -
Mar 24, 2005
filing date -
Mar 25, 2004
priority date (Note) -
Expired
status (Latency Note)
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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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