Patent ID: 8721494

Claim:
An apparatus for controlling fluid flow to a variator in an automatic transmission, the variator responsive to separate high and low pressure fluids to control an output torque of the variator, the apparatus comprising: a first trim valve responsive to a first control signal to supply a first fluid at a fluid outlet thereof, a second trim valve responsive to a second control signal to supply a second fluid at a fluid outlet thereof, a variator switching sub-system controllably supplying the high pressure fluid and the low pressure fluid to the variator, and a multiplex valve fluidly coupled to the outlets of the first and second trim valves, the multiplex valve supplying the first fluid supplied by the first trim valve as the high pressure fluid to the variator switching sub-system during at least one predefined operating condition of the automatic transmission and otherwise supplying the second fluid supplied by the second trim valve as the high pressure fluid to the variator switching sub-system.