Patent ID: 8083626

Claim:
A powertrain system for a vehicle, comprising: an engine; and a transmission including a transmission input member, first and second electric machines, a first 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 first planetary gear set and said transmission case, a second selectively engageable torque transfer device between said first gear member of said first planetary gear set and said first electric machine, a third selectively engageable torque transfer device operable when engaged to connect said first electric machine and said transmission input member, a transmission output member connected to said second gear member of said first planetary gear set, said second electric machine connected to said third gear member of said first planetary gear set, a second planetary gear set including respective first, second and third gear members, said transmission input member connected to said first gear member of said second planetary gear set, said second gear member of said second planetary gear set connected to said first electric machine, said third selectively engageable torque transfer device between said third gear member of said second planetary gear set and said transmission input member, and a fourth selectively engageable torque transfer device between said transmission input member and said transmission case.