Patent ID: 8512204

Claim:
A powertrain system including an engine coupled via an input member to a transmission to transfer torque to an output member, comprising: the engine configured to execute an autostop event and an autostart event during ongoing powertrain operation; the transmission comprising a plurality of planetary gear sets and a plurality of torque transfer clutches; the plurality of torque transfer clutches comprising hydraulically-activated clutches and mechanical clutch devices comprising an electromechanically-activated selectable one-way clutch; the transmission configured to provide hydraulic pressure to activate the hydraulically-activated clutches using only a mechanically driven hydraulic pump; and the transmission configured to effect torque transfer among the input member, the plurality of planetary gear sets and the output member in one of a plurality of fixed gear states by selectively activating at least one of the plurality of torque transfer clutches, wherein selectively activating said at least one of the plurality of torque transfer clutches comprises activating only the mechanical clutch devices including the electromechanically-activated selectable one-way clutch when the engine executes an autostart event during ongoing powertrain operation.