Patent ID: 8578802

Claim:
An apparatus for multiplexing gear engagement control in an automatic transmission operable in a plurality of operating modes, comprising: a first and a second friction engagement device, each of the first and second friction engagement devices selectively engageable and disengagable to select a different gear ratio of the transmission, a trim system configured to selectively supply fluid at one of (i) an engagement pressure and (ii) a disengagement pressure to a first fluid passageway and a second fluid passageway in one of the plurality of operating modes, and a first control valve fluidly coupled directly to the first fluid passageway and the second fluid passageway and directly to the first friction engagement device and the second friction engagement device, the first control valve configured to selectively (i) route fluid at the engagement pressure to the first friction engagement device to engage the first friction engagement device and (ii) contemporaneously route fluid at the disengagement pressure to the second friction engagement device to disengage the second friction engagement device in the one of the plurality of operating modes.