Transmission system solenoid controlled actuator fault detection

Details Transmission system solenoid controlled actuator fault detection Transmission system solenoid controlled actuator fault detection

1991-03-14

1993-12-21

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324418, 324422, G01R 3106

Patent

active

052724417

ABSTRACT:
Open-circuit and closed-circuit faults in a solenoid controlled actuator are detected using shunt resistors (R1, R4) across the solenoid (1), a transistor switch (4), and a voltage monitor (7) and/or (14) across one or both of these which can detect a faulty open-circuit solenoid that is not energized, or a faulty closed-circuit solenoid that is energized. According to the present invention, before each change in actuator position, the solenoids are all caused to assume an opposite energization condition for a period of time insufficient to move the actuator, but enough to check the voltage monitor responses. In this way, both open and closed circuit faults are detected.

REFERENCES:
patent: 4445393 (1984-05-01), Braun
patent: 4595986 (1986-06-01), Daubenspeck et al.
patent: 4676115 (1987-06-01), Morscheck et al.
patent: 4722237 (1988-02-01), McNinch, Jr.
patent: 4764884 (1988-08-01), Noyori
patent: 4936156 (1990-06-01), Peterson et al.
patent: 4961051 (1990-10-01), Tjebban
patent: 5153522 (1992-10-01), Sano

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