Eddy current proximity sensing means and method useful for determining throttle position
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United States of America Patent
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Sep 21, 1993
Grant Date -
N/A
app pub date -
Nov 9, 1990
filing date -
Nov 9, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a preferred embodiment, an inductor excited by a square-wave alternating current to produce a magnetic field in the inductor. A member movable in proximity to the inductor causes losses in the magnetic energy, which losses are directly related to the position of the member with respect to the coil. In another aspect of the invention, there is provided an inductor excited by an alternating current and a moving member which includes a ferromagnetic core having disposed thereon a thin sleeve of high resistivity material. In a further aspect of the invention, there is provided an inductor excited by an alternating current and a moving member, the excitation circuit including an oscillator having a positive temperature coefficient of frequency.
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