Some Useful Terminology of Engine

•Internal combustion engine (ICE): an engine that drives a piston by the hot air produced by the burning of gasoline, oil, or other fuel with air inside. 
•Transmission: A gearbox that use gears and gear trains to provide speed and torque conversion between one rotating power source to another. 
•Differential (D): a geartrain that splits the torque two ways, allowing each output to spin at different speed when vehicle is turning. 
•Clutch: a mechanism for connecting and disconnecting a vehicle’s engine from its transmission system. 
•Electric machine (EM): a general term for Electric Motors and electric generators. 
•Energy management system (EMS) : A system that controls the flow of energy from multiple energy sources.