Hydraulic control system for an automatic transmission having a lubrication regulation valve
A hydraulic control system for a transmission includes a first source of pressurized hydraulic fluid, a second source of pressurized hydraulic fluid, a lubrication subsystem for communicating a pressurized hydraulic fluid through the transmission, and a fluid control device in communication with the first source of pressurized hydraulic fluid. A lubrication regulation valve is in communication with the first and second sources of pressurized hydraulic fluid, the fluid control device, and the lubrication subsystem. The lubrication regulation valve allows fluid communication from the first source of pressurized hydraulic fluid to the lubrication subsystem when in a first position, the valve allows fluid communication from the first and second source of pressurized hydraulic fluid to the lubrication subsystem when in a second position, and the valve allows fluid communication from the first source of pressurized hydraulic fluid through the flow restriction device to the lubrication subsystem when in a third position.
GM Global Technology Operations LLC
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Y10T F16H F16H F16H F16H
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John R. Chinar S. Steven P.
Czoykowski Ghike Moorman