Method for detecting closure of a solenoid coil from the rise ti

Details Method for detecting closure of a solenoid coil from the rise ti Method for detecting closure of a solenoid coil from the rise ti

1996-10-28

1999-01-19

Patidar, Jay M.

Electricity: measuring and testing

Magnetic

Displacement

32420726, 324654, 361160, G01B 714, H01H 4700

Patent

active

058617469

ABSTRACT:
A method for detecting closure of a solenoid coil in a solenoid arrangement in a solenoid arrangement having first (4) and second (40) solenoid coils and a solenoid armature (5) that communicates between the coils (4, 40). A holding current signal (25) is provided (70) to the first solenoid coil (4) to maintain the solenoid armature (5) in an initial closed position with the first solenoid coil (4). A pulling current signal (27) is provided (50) to the second solenoid coil (40), the pulling current signal includes current peaks (19) with a measurable rise time (21). A value representative of the rise time for one of the current peaks is stored (58, 60), then the holding current signal is removed from the first solenoid coil (4). A rise time of each of the current peaks in the second solenoid coil (40) are sensed, and a determination when the rise time of a current peak changes from the stored rise time by a predetermined amount is made (90). An indication (94) that the solenoid armature is in a closed position with the second solenoid coil is made when the rise time of a current peak returns to substantially the same value as the stored rise time.

REFERENCES:
patent: 5424637 (1995-06-01), Oudyn et al.
patent: 5481187 (1996-01-01), Marcott et al.

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