EGR valve linear position sensor having variable coupling transformer
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United States of America Patent
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-
Sep 22, 1998
Issued Date -
N/A
app pub date -
Dec 17, 1993
filing date -
Jan 11, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An valve position sensor apparatus for measuring the linear position of an EGR valve including a valve stem portion is disclosed. The apparatus comprises an elongated sensor probe extending from a base and a tubular member slideably overlying a varying length of the probe. The base is adapted to be secured relative to the EGR valve. The probe includes parallel, spaced apart, coextensive primary and secondary windings having a transformer coupling. The tubular member is movable with the EGR valve stem and is comprised of a material adapted to alter the transformer coupling of the overlied windings. An AC signal is supplied to the primary winding thereby inducing a signal in the secondary winding, the magnitude of the induced signal being dependent on the transformer coupling. An output means monitors the signal induced in the secondary winding and provides an output signal related to the linear position of the EGR valve.
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