Process and apparatus for the recognition of the state of a sole

Details Process and apparatus for the recognition of the state of a sole Process and apparatus for the recognition of the state of a sole

1998-09-18

2000-01-25

Douglas, Steven O.

Valves and valve actuation

Electrically actuated valve

Including solenoid

25112918, 25112919, 2511292, 25112905, 123 9011, 324416, 324418, 324422, 324423, 324420, 316152, 316154, 316178, 137551, 137554, F16K 3102

Patent

active

060170174

ABSTRACT:
A method and apparatus for the recognition of the state of a solenoid valve supplies an on/off control switching current to the coil of the solenoid valve. A high level of current is caused to flow through the coil for switching the device on, and a reduced level of current is applied to the coil for holding the solenoid armature in its on position. If the armature should be caused to drop off from its on position by a mechanical shock, an increase in the frequency of the switching current occurs, due to the decrease in magnetic circuit inductance. This frequency increase is detected and compared to a predetermined threshold value. If the detected frequency exceeds the threshold value, it is recognized as an armature drop off, and corrective action can be taken immediately.

REFERENCES:
patent: 5245501 (1993-09-01), Locher et al.
patent: 5311903 (1994-05-01), Poulin
patent: 5583434 (1996-12-01), Moyers et al.
patent: 5647387 (1997-07-01), Tsutsui
patent: 5650909 (1997-07-01), Remele et al.
patent: 5752308 (1998-05-01), Maley et al.
patent: 5889405 (1999-03-01), Yanai et al.
patent: 5942892 (1999-08-01), Li

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