Method and apparatus for determining the armature impact time wh

Details Method and apparatus for determining the armature impact time wh Method and apparatus for determining the armature impact time wh

1995-09-18

1997-07-22

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361170, H01H 4728

Patent

active

056509090

ABSTRACT:
This invention relates to a method and apparatus for recognizing the impact time of a solenoid valve armature during de-energizing. In order to obtain a detectable impact signal of the armature, a measuring current is provided in the magnet coil during the armature's downward movement to generate a magnetic measuring field. When this magnetic measuring field is changed due to the armature movement, an induction voltage is generated, which is monitored to detect the time of impact of the armature.

REFERENCES:
patent: 4930040 (1990-05-01), Binarsch et al.
patent: 5471360 (1995-11-01), Ishikawa et al.
Patent Abstract of Japan for JP4196203 dated Jul. 16, 1992.
Foreign Search Report dated Jul. 5, 1996.

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