Electromechanical variable transmission

A drive train for a vehicle, comprising:

• a first planetary gear set;
• a second planetary gear set directly coupled to the first planetary gear set;
• an output shaft selectively coupled to at least one of the first and the second planetary gear sets;
• an engine at least selectively rotationally engaged with the first planetary gear set;
• a first electromagnetic device directly coupled to the first planetary gear set;
• and
• a second electromagnetic device directly coupled to the second planetary gear set and selectively rotationally engaged with the engine.

A vehicle, comprising:

• a dual-mode transmission comprising a first gear set having a first planetary gear carrier and a second gear set having a second planetary gear carrier;
• an engine coupled to the first gear set;
• a first motor/generator coupled to the first gear set;
• a second motor/generator coupled to the second gear set;
• and
• a drive axle coupled to the dual-mode transmission;
• wherein during a first mode of operation of the vehicle the second motor/generator is coupled to the drive axle and disengaged from the engine, and
• wherein during a second mode of operation of the vehicle the second motor/generator is selectively coupled to the engine.