Patent ID: 8251850

Claim:
A hybrid electro-mechanical transmission connectable with multiple power sources for launching and propelling a vehicle, comprising: an output member; a stationary member; a first planetary gear set and a second planetary gear set, wherein each of the respective first and second planetary gear sets includes a first, a second, and a third member, and wherein two members of the first planetary gear set are continuously connected to two members of the second planetary gear set; and a torque-transmitting device; the power sources including: a first motor/generator; a second motor/generator; and an engine; wherein: the engine and the second motor/generator are each continuously connected to the first planetary gear set, and the first motor/generator and the output member are each continuously connected to the second planetary gear set, and the torque-transmitting device is engageable to ground the engine to the stationary member such that the transmission provides a first drive mode and a second drive mode for launching and propelling the vehicle.