192 clutches and power-stop control – Clutches – Operators
Patent
1998-08-28
1999-11-16
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
123 4111, F16D 1900, F01D 702
Patent
active
059840706
ABSTRACT:
A device (10) is disclosed for intercepting the input of a system (23) of an internal combustion engine (12) normally provided to a solenoid valve (22) for actuating a fan clutch (20). A pressure switch (24) is provided in the pressure line between the solenoid valve (22) and the fan clutch (20). The input is received by terminals (27, 28) and is passed on to a transistor (53) which turns on and allows current flow to the solenoid valve (22) during a first period of time. If a second transistor (48) turns on because the pressure switch (24) remains open as a set point is not sensed in the pressure line and does not discharge a time delay circuit formed by a combination of a resistor (44) and a capacitor (46), then the voltage of the gate of the first transistor (53) is pulled down to turn the transistor (53) off and interrupt the current flow to the solenoid valve (22). When the current flow to the solenoid valve (22) is interrupted, the solenoid valve (22) exhausts the fluid pressure, and actuation of the fan clutch (20) is interrupted.
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Briggs Bradley R.
Daniels William R.
Bonck Rodney H.
Horton, Inc.
Kamrath Alan
Waddell Tisha D.
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