Plugged filter detection system

Details Plugged filter detection system Plugged filter detection system

2006-05-03

2009-11-03

Lorence, Richard M. (Department: 3655)

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

C192S03000R, C192S085060, C210S090000

Reexamination Certificate

active

07611001

ABSTRACT:
A plugged filter detection system includes a valve housed within a cavity defining an initial inlet for receiving fluid at an inlet pressure before fluid enters a filter, a final inlet for receiving fluid at an outlet pressure after the fluid exits the filter, and a switch port for directing fluid to a switch to activate the switch. The inlet pressure biases the valve in a first direction and the outlet pressure biases the valve in a second direction substantially opposing the first direction. The valve is movable from a first position to a second position to unblock the switch port, thereby allowing the switch to be activated when inlet pressure is greater than outlet pressure. A spring preferably biases the valve in the second direction, such that inlet pressure must be greater than outlet pressure by at least the spring constant to allow switch activation.

REFERENCES:
patent: 4153003 (1979-05-01), Willis
patent: 5160037 (1992-11-01), LeCour
patent: 5501791 (1996-03-01), Theisen et al.
patent: 6668978 (2003-12-01), Fessler et al.
patent: 2008/0053879 (2008-03-01), Harris

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