Transmission system solenoid controlled actuator fault...

Details Transmission system solenoid controlled actuator fault... Transmission system solenoid controlled actuator fault...

F - Mech Eng,Light,Heat,Weapons

16

H

341/109, 341/68

F16H 61/18 (2006.01) F16H 61/12 (2010.01) G06F 11/00 (2006.01) F16H 61/28 (2006.01)

Patent

CA 2038389

Solenoid actuator open-circuit and closed-circuit faults are detected using shunt resistors (R1, R4) across the solenoid (1), a transistor switch (4), 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. The invention proposes that, before each change in actuator position, the solenoids are all energized to an opposite condition for a time insufficient to move the actuator, but enough to check the voltage monitor responses. In this way, all open and closed circuit faults are detected.

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