Patent ID: 7300374

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; an interconnecting member continuously connecting said first member of said first gear set with said first member of said second 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 alternately connected with two of said members of said first or second gear set; a first torque transfer device selectively connecting a member of said first gear set with a member of said first or second gear set; a second torque transfer device selectively connecting a member of said first gear set with a member of said second gear set; a third torque transfer device connected in parallel with one of said first and second motor/generators for selectively preventing rotation thereof; wherein said first, second and third torque transfer devices are engageable to provide an electrically variable transmission with a continuously variable range of speed ratios and multiple fixed forward speed ratios.