METHODS AND APPARATUS TO AUTOMATICALLY DETERMINE FRICTION OF A CONTROL VALVE

Methods, apparatus, systems and articles of manufacture are disclosed for automatically determining friction of a control valve. An example apparatus includes a hysteresis measurement controller to determine an average control hysteresis value for a valve over a first range of travel of the valve, a...

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Bibliographische Detailangaben
Hauptverfasser:	Fontaine, Michael, Smid, David
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Beschreibung
Zusammenfassung:	Methods, apparatus, systems and articles of manufacture are disclosed for automatically determining friction of a control valve. An example apparatus includes a hysteresis measurement controller to determine an average control hysteresis value for a valve over a first range of travel of the valve, a comparator to compare the average control hysteresis value to a second value corresponding to a second range of travel of the valve encompassing the first range of travel of the valve, and a step size selector to select one of multiple control step sizes for the valve based on the comparison.