Patent ID: 8864613

Claim:
A drive train for a vehicle, comprising: a first gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear; a second gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear, wherein the planetary gears of both sets are rotatably supported by respective planetary gear carriers which are coupled to each other; an engine having an output shaft; a first clutch which selectively engages the output shaft of the engine with 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 electrically coupled to the first motor/generator; a second clutch which selectively engages the output shaft of the engine with the second motor/generator; and a third clutch and a third gear set which operate to selectively engage at least one of the sun gear and the ring gear of the second gear set with the planetary gear carriers of the first and second gear sets.