Fluid flow self calibration scheme
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United States of America Patent
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-
Nov 7, 1989
Grant Date -
N/A
app pub date -
Mar 11, 1988
filing date -
Mar 11, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fluid system for calibrating a variable area metering valve during flight when the fluid receiver is not in operation employs several single point fixed calibration orifices that are sequentially used to establish a corresponding number of calibration points in a short time interval. The position of the metering valve movable element is stored in a memory of a microprocessor for each calibration point and the metering valve may thereafter be driven by the microprocessor to control with precision flow rates to the receiver without the need for a flow meter. Operation is free to bench calibration inaccuracies and possible drift due to mechanical wear.
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