Dual mode input split compound split configuration EPPV transmission

A dual mode EPPV transmission hybrid electric drive system for propelling a machine using a combination of power sources, the drive system comprising:

• an internal combustion engine having an engine output for providing rotational power;
• a first electric motor having an output for providing rotational power;
• a second electric motor having an output for providing rotational power;
• and
• a transmission for receiving rotational power from the internal combustion engine, first electric motor, and second electric motor, and for combining the received rotational power into a transmission output power for propelling the machine, the transmission including:
• a first planetary gear set including a first ring gear linked to a first sun gear via a pinion on a first carrier, the first sun gear receiving rotational power from the engine output and the first ring gear being rotationally fixed to the first electrical motor;
• a second planetary gear set including a second ring gear linked to a second sun gear via a pinion on a second carrier, the second carrier being rotationally fixed to the first carrier and to a transmission output, and the second sun gear being rotationally fixed to the second electrical motor;
• and
• a first clutch selectively linking the first ring gear to the second ring gear and a second clutch selectively braking the second ring gear such that when the first clutch is engaged, the transmission exhibits a first mode of power transmission characteristics and when the second clutch is engaged the transmission exhibits a second and distinct mode of power transmission characteristics.