Lubrication control system for automatic transmissions

Details Lubrication control system for automatic transmissions Lubrication control system for automatic transmissions

2008-02-25

2010-10-19

Nguyen, John Q (Department: 3654)

Lubrication

Systems

Gearing

C475S159000, C137S625690

Reexamination Certificate

active

07815016

ABSTRACT:
An automatic transmission lubrication control system includes a modulating, spring biased spool valve and feedback circuit. One end of the spool valve is supplied with line pressure hydraulic fluid. The valve spool modulates a flow of lubricating hydraulic fluid from the cooler and its position is determined by a force balance between the line pressure, the regulated fluid output pressure to the lubrication system and the force of the biasing spring. In a reduced lubrication state, a signal from a transmission control module opens a solenoid valve to provide high pressure fluid to a three way check valve which closes the feedback circuit and applies high pressure fluid to the opposite end of the valve spool. This action moves the valve spool to a travel limit, closing off flow from the cooler. Hydraulic fluid from the torque converter feed is then routed to the lubrication system.

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