Patent ID: 7217211

Claim:
An electrically variable transmission comprising: first and second motor/generators; first, second and third differential gear sets, each having first, second and third members, said first and second motor/generators being continuously connected to respective ones of said differential gear sets and controllable to provide power thereto; a plurality of torque-transmitting mechanisms; an input member to receive power from a power source and being continuously connected to a member of one of said gear sets; an output member continuously connected to another member of one of said gear sets; said plurality of torque-transmitting mechanisms being selectively engageable to transfer power received by said input member from the power source through said differential gear sets to provide an input-split, electrically variable first mode having a forward and a reverse range with respective equal forward and reverse speed ratios for given input speeds; and wherein said first differential gear set is interconnected between said input member and said second motor/generator such that a connecting member between said second motor/generator and one of said other differential gear sets rotates in a same direction as said input member so that torque provided from the power source is added to torque provided from said second motor/generator at said output member.