Fluid-level sensing and fluid detection
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United States of America Patent
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Issued Date -
Mar 2, 2006
app pub date -
Aug 18, 2005
filing date -
Aug 27, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An aircraft low fuel level sensing system has a thermistor mounted in a tank at the level at which a warning is to be produced. A constant current source is alternately connected and disconnected from the thermistor so that it cycles between warming and cooling phases. The rate of change of resistance of the thermistor varies with the warming and cooling cycles according to whether it is immersed in fuel or is exposed above the fuel. A processor correlates the thermistor resistance change curves with stored curves to determine whether the curve is indicative of an exposed thermistor, in which case, a low fuel level warning is produced.
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