Power transfer assembly

An engine comprising:

• a cylinder head;
• an engine block;
• a cylinder provided within the engine block;
• a piston provided within the cylinder;
• a crankshaft coupled to the piston;
• and
• a power transfer assembly comprising:
• a first flywheel coupled to the crankshaft;
• a second flywheel selectively coupled to the first flywheel;
• a first transmission unit coupled to the first flywheel and the second flywheel, the first transmission unit adapted to selectively transfer mechanical power between the first flywheel and the second flywheel;
• and
• a second transmission unit coupled to the first transmission unit, the second flywheel, and an engine accessory, the second transmission unit adapted to selectively transfer mechanical power between any one of the first transmission unit and the second flywheel, and the engine accessory.

A method for controlling a power transfer assembly, the power transfer assembly having a first flywheel selectively coupled to a second flywheel, the method comprising:

• monitoring a first speed of the first flywheel;
• monitoring a second speed of the second flywheel;
• synchronizing a match speed between the first flywheel and the second flywheel;
• and
• proportionately engaging the first flywheel and the second flywheel based, at least in part, on a difference between any one of the first speed and the second speed, and the match speed.