Patent ID: 7967711

Claim:
A powertrain system for a vehicle, comprising: an engine; and a transmission including a transmission input member coupled to the engine, first and second electric machines, first and second planetary gear sets, each planetary gear set including respective first, second and third gear members, a transmission case, a first selectively engageable torque transfer device between said first gear member of said second planetary gear set and said transmission case, a second selectively engageable torque transfer device between said first gear member of said second planetary gear set and said first electric machine, a third selectively engageable torque transfer device operable when engaged to connect said second electric motor and said transmission input member, a transmission output member connected to said second gear member of said second planetary gear set, and said second electric machine connected to said third gear member of said second planetary gear set; and a control system for establishing powertrain operating states including a first electric vehicle operating state comprising said first selectively engageable torque transfer device engaged, said second and third selectively engageable torque transfer devices disengaged, and said second electric machine providing torque, a second electric vehicle operating state comprising said second selectively engageable torque transfer device engaged, and said first and third selectively engageable torque transfer devices disengaged, and said first and second electric machines providing torque, a first electrically variable transmission operating state comprising said first selectively engageable torque transfer device engaged, and said second and third selectively engageable torque transfer devices disengaged, a second electrically variable transmission operating state comprising said second selectively engageable torque transfer device engaged, and said first and third selectively engageable torque transfer devices disengaged, and a charging operating state comprising said first, second, and third selectively engageable torque transfer devices disengaged.