Pressure monitoring system and inflation valve using same
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United States of America Patent
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Apr 6, 2004
Grant Date -
Aug 29, 2002
app pub date -
Jan 24, 2002
filing date -
Jul 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pressure monitoring system has a first chamber (11) and a second chamber (12) separated by a diaphragm. The diaphragm carries respective SAW devices on the respective sides thereof, the SAW devices having different resonant frequencies. Variations in pressure within the second chamber (12) relative to the pressure within the first chamber (11) will cause deflection of the diaphragm and the resulting changes in resonant frequency of the SAW devices can be analyzed to indicate the pressure differential between the chambers. The pressure-measuring device is incorporated within a valve assembly for a vehicle tire. When the vehicle tire is inflated, the inflation pressure is trapped within the first chamber (11) as a reference. Any subsequent loss of pressure from the second chamber (12), e.g. as a result of a puncture, will cause deflection of the diaphragm and a corresponding output from the SAW devices.
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