Fault detection system and method for solenoid controlled actuators of a transmission system
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United States of America Patent
Stats
-
Oct 23, 2001
Grant Date -
N/A
app pub date -
Dec 23, 1998
filing date -
Dec 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved system and method for detecting solenoid-related faults in a solenoid-controlled actuator assembly. The system includes a processing circuit which controls a solenoid driver circuit for energizing and de-energizing the solenoid, a current sense circuit for sensing the current in the solenoid, and a power supply switching circuit for selectively connecting and disconnecting a supply voltage from the solenoid driver circuit. The processing circuit implements fault detection logic wherein the processing circuit senses the current in the solenoid and, if the sensed current exceeds a predetermined current value for a predetermined time period, disconnects the supply voltage from the solenoid driver circuit and measures the rate of voltage decay in the solenoid driver circuit to determine if an open circuit fault or a short circuit fault exists.
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