Electricity: measuring and testing – Magnetic – Displacement
Patent
1993-12-17
1998-09-22
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420722, 123612, G01B 714, H01F 2102, G08C 1906, G08C 1912
Patent
active
058119671
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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Rigling Timothy J.
Shank David W.
Nartron Corporation
Snow Walter E.
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