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
OG exemplary drawing
 
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.