Measuring and testing – Instrument proving or calibrating – Displacement – motion – distance – or position
Reexamination Certificate
2011-08-16
2011-08-16
Raevis, Robert R (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Displacement, motion, distance, or position
Reexamination Certificate
active
07997117
ABSTRACT:
A method of calibrating an electrically controlled hydraulic valve having a known relationship between flow rate through the valve and displacement of a valve element is disclosed. The method includes ascertaining a first current level for actuating the electrically controlled hydraulic valve to move the valve element to a position adjacent an inlet port, and a first displacement of the valve element responsive to the first current level. The method also includes ascertaining a second current level for actuating the electrically controlled hydraulic valve to move the valve element from the position adjacent the inlet port to a position permitting flow through the inlet port, and ascertaining a second displacement of the valve element responsive to the second current level. The method further includes establishing a relationship between current and displacement associated with the electrically controlled hydraulic valve.
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Beschorner Matthew James
Egelja Aleksandar M.
Shang Tonglin
Yoo Benjamin
Zhang Jiao
Caterpillar Inc.
Finnegan Henderson Farabow Garrett & Dunner LLP
Raevis Robert R
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