Electromotive sensor

Details Electromotive sensor Electromotive sensor

1989-03-28

1990-07-17

Myracle, Jerry W.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

324654, G01M 1900

Patent

active

049413481

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.

REFERENCES:
patent: 3828247 (1974-08-01), Kirsch et al.
patent: 4821562 (1989-04-01), Inoue

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