Patent ID: 8708853

Claim:
A hybrid transmission operatively connected with an engine, comprising: an input member operatively connected with the engine; an output member; only a first and a second selectively engageable torque-transmitting mechanism; a gearing arrangement including a first, a second, and a third planetary gear set, each of said planetary gear sets having a first member, a second member, and a third member; a first interconnecting member connecting a respective one of said members of each of said planetary gear sets for common rotation; a second interconnecting member connecting another one of said members of the second planetary gear set for common rotation with another one of said members of the third planetary gear set; a first motor/generator operatively connected with the first planetary gear set; a second motor/generator operatively connected with the second planetary gear set; wherein only the first torque-transmitting mechanism is engaged to establish a hybrid series operating mode between the input member and the output member; wherein only the second torque-transmitting mechanism is engaged to establish a compound-split operating mode between the input member and the output member; wherein the input member is connected for common rotation with a first member of the first planetary gear set; wherein the first motor/generator is connected for common rotation with a second member of the first planetary gear set; wherein the third member of the first planetary gear set is selectively grounded to the stationary member by engagement of the first torque-transmitting mechanism and is continuously connected for common rotation with the first member of the second planetary gear set and the first member of the third planetary gear set by the first interconnecting member; wherein the second motor/generator is continuously connected for common rotation with the second member of the second planetary gear set and with the second member of the third planetary gear set by the second interconnecting member; wherein the output member is continuously connected for common rotation with the third member of the third planetary gear set; and wherein the second torque-transmitting mechanism is selectively engageable to connect the second member of the first planetary gear set for common rotation with the third member of the second planetary gear set.