Electrically variable transmission having two planetary gear sets with one interconnecting member and clutched input

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;
• an interconnecting member continuously connecting said first member of said first planetary gear set with said first member of said second planetary gear set;
• 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;
• and
• first, second, third, fourth and fifth torque transfer devices for selectively connecting said members of said first or second gear sets with said input member, with ground or with other members of said planetary gear sets, said first, second, third, fourth and fifth torque transfer devices being engageable in combinations of two or three to provide an electrically variable transmission with a continuously variable range of speed ratios and four fixed forward speed ratios between said input member and said output member.

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;
• an interconnecting member continuously connecting said first member of said first planetary gear set with said first member of said second planetary gear set;
• 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 said input member with a member of said first or second gear set, or with said interconnecting member;
• a second torque transfer device selectively connecting said input member with a member of said first or second gear set, or with said interconnecting member, such that the pair of members connected by the second torque transfer device is different than the pair of members connected by the first torque transfer device;
• 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 five operating modes in the electrically variable transmission, including battery reverse mode, EVT reverse mode, reverse and forward launch modes, continuously variable transmission range mode, and fixed ratio mode.