Patent ID: 7232393

Claim:
An electrically variable transmission comprising: an input member to receive power from an engine; an output member; first and second motor/generators; first and second differential gear sets each having first, second and third members; said input member being continuously connected with a member of said gear sets, and said output member being continuously connected with another member of said gear sets; a first interconnecting member continuously connecting said first member of said first gear set with said first member of said second gear set; a second interconnecting member continuously connecting said first or second member of said second gear set with said second member of said first gear set, or with a stationary member; said first motor/generator being continuously connected with a member of said first or second gear set; said second motor/generator being continuously connected with a member of said second gear set which is different from said member connected with said first motor/generator; a first torque transfer device selectively connecting a member of said first gear set with another member of said first or second gear set; a second torque transfer device connected in parallel with said first or second motor/generator for braking rotation thereof; wherein said first or second torque transfer devices are selectively engageable singly to provide an electrically variable transmission with a continuously variable range of speed ratios and two or three fixed forward speed ratios.