Electromotive sensor
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United States of America Patent
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-
Jul 17, 1990
Grant Date -
N/A
app pub date -
Mar 28, 1989
filing date -
Mar 28, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The circuit senses abrupt change in motion of an electromotively-driven part such as the onset of valve seating in a solenoid-operated valve. A constant current source supplies power to the solenoid coil and a pulse detector circuit monitors the voltage across the coil and determines the time rate of change of that voltage. A change in the algebraic sign of the time rate of change in voltage indicates that valve seating has occurred.
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