Patent ID: 7815016

Claim:
A lubrication control system for an automatic transmission comprising, in combination, a multiple port spool valve having a valve spool disposed in a valve body, a first control port in said body for providing fluid to one end of said valve spool, a spring for biasing said valve spool away from said first port, a second control port in said body for providing fluid to an opposite end of said valve spool, a first inlet port, a first outlet port communicating with a first, larger fluid orifice, a second inlet port communicating with a second, smaller fluid orifice, and a first exhaust port communicating with a sump, a control valve for selectively providing pressurized fluid, a three way check valve communicating with said first outlet port, said first control port and said control valve, whereby pressurized fluid is provided by said control valve through said three way check valve to said first control port, whereby pressurized fluid provided to said second control port modulates a fluid flow between said first inlet port and said first outlet port when said control valve is closed and a fluid flow is established between said second inlet port and said first outlet port when said control valve is open.