| US 7,455,609 B2 | ||
| Electrically variable transmission having three planetary gear sets and clutched motor/generators | ||
| Madhusudan Raghavan, West Bloomfield, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Jun. 26, 2006, as Appl. No. 11/426,355. | ||
| Prior Publication US 2007/0298923 A1, Dec. 27, 2007 | ||
| Int. Cl. F16H 3/72 (2006.01); F16H 3/44 (2006.01) | ||
| U.S. Cl. 475—5 [475/284; 475/303] | 14 Claims |

| 7. An electrically variable transmission comprising:
an input member to receive power from an engine;
an output member;
first and second motor/generators;
first, second and third differential gear sets each having first, second and third members;
said input member being continuously connected with at least one 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 member of said third gear set with said second or third
member of said first gear set, or with a stationary member;
a third interconnecting member continuously connecting said second member of said first gear set with said second member of
said second or third gear set;
said first motor/generator being continuously connected with a member of said first or second gear set;
said second motor/generator being selectively connected via a dog clutch with members of said first, second or third gear
sets;
first, second, third and fourth torque transmitting devices for selectively connecting said members of said first, second
or third gear sets with a stationary member or with other members of said gear sets, said first, second, third and fourth
torque transmitting devices being engagable 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; and
wherein said fourth torque transmitting device selectively connects a member of said third gear set with said stationary member.
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