Method and apparatus for checking operation of solenoid

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element

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Details

324418, 32420722, 32420726, 340644, G01R 3106

Patent

active

052432963

ABSTRACT:
When a solenoid has been turned on by supplying current to a coil thereof, the solenoid operation is checked by temporarily ceasing the supply of current to the coil to temporarily deenergize the solenoid. The current flowing in the coil is detected while the solenoid is temporarily deenergized, and the characteristics of the thus detected current are used to discriminate the position of a movable iron core of the solenoid. On the other hand, when the solenoid has been turned off by ceasing the supply of current to the coil, the solenoid operation is checked by temporarily supplying current to the coil to thereby temporarily energize the solenoid. The current flowing in the coil while the solenoid is temporarily energized is detected, and the characteristics of the thus detected coil current are used to determine the position of the movable iron core of the solenoid.

REFERENCES:
patent: 4319193 (1982-03-01), Boccali et al.
patent: 4504789 (1985-03-01), Carr et al.

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