Patent ID: 7261658

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 not being continuously connected with any member of said gear sets, and said output member being continuously connected with a member of said gear sets; said first member of said second gear set being continuously connected with ground; said first motor/generator being continuously connected with a member of said first gear set; said second motor/generator being continuously connected with a member of said first or 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 said input member; a second torque transfer device selectively connecting a member of said second gear set with said input member; a third torque transfer device selectively connecting a member of said first gear set with a member of said second gear set; a fourth torque transfer device connected in parallel with said first motor/generator for braking rotation thereof; a fifth torque transfer device connected in parallel with said second motor/generator for braking rotation thereof; and wherein said first, second, third, fourth and fifth torque transfer devices are engageable in combinations of two or three to provide an electrically variable transmission with a continuously variable range of speed ratios and three fixed forward speed ratios.