Patent ID: 8556769

Claim:
A powertrain comprising: an input member; an output member; a stationary member; a first and a second electric machine; only a single planetary gear set operatively connectable between the input member and the output member and having a first member, a second member, and a third member; wherein the first, the second, and the third members include a ring gear member, a sun gear member, and a carrier member that supports pinion gears that mesh with both the ring gear member and the sun gear member; a first, a second, a third, and a fourth selectively engageable torque-transmitting mechanism; wherein the first torque-transmitting mechanism is selectively engageable to operatively connect the second electric machine with the output member; wherein the second torque-transmitting mechanism is selectively engageable to operatively connect the second member with the output member such that the output member rotates commonly with the second member; wherein the third torque-transmitting mechanism is selectively engageable to operatively connect the third member to the stationary member; wherein the fourth torque-transmitting mechanism is selectively engageable to operatively connect the second member to the stationary member; and wherein selective engagement of a different one or ones of the torque-transmitting mechanisms and selective operation of one or both electric machines establishes a series operating mode, an input-split operating mode, an electric-only operating mode, and a fixed gear operating mode between the input member and the output member.