Multi-mode integrated starter-generator device with dog clutch arrangement

A drivetrain assembly for a work vehicle, comprising:

• an engine;
• an electric machine;
• a gear set configured to receive rotational input from the electric machine and from the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in one of at least a first gear ratio, a second gear ratio, or a third gear ratio in the first power flow direction and at least the third gear ratio in the second power flow direction;
• and
• a dog clutch arrangement having at least a first clutch, a second clutch, and a third clutch selectively coupled to the gear set, each selectively repositionable between an engaged position and a disengaged position,
• wherein the first clutch, in the engaged position, is configured to effect the first gear ratio in the first power flow direction as a cold engine start mode,
• wherein the second clutch, in the engaged position, is configured to effect the second gear ratio in the first power flow direction as a warm engine start mode,
• wherein the third clutch, in the engaged position, is configured to effect the third gear ratio in the first power flow direction as a boost mode and to effect the third gear ratio in the second power flow direction as a generation mode.