Method and apparatus for monitoring and determining the...

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

Reexamination Certificate

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Details

C324S418000, C324S422000, C324S423000, C324S546000

Reexamination Certificate

active

07405917

ABSTRACT:
The present invention provides a method and apparatus for determining the functional status of an electromagnetic valve having a solenoid and plunger including determining the electro-mechanical switching time of a valve based on characteristics of an electrical characteristic responsive to the solenoid; comparing the valve electro-mechanical switching time to a predetermined value; and generating a valve status signal dependant on the results of the comparison.

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