Work cycle: The conversion of internal combustion engine thermal energy and mechanical energy through the continuous intake, compression, power and exhaust processes of the piston in the cylinder. The process of each machine is called a work cycle.
Piston stroke: The minimum linear distance between the top and bottom dead centers is called the stroke (or piston stroke) of the piston. The minimum linear distance between the connecting center of the crankshaft and the big end of the connecting rod and the rotation center of the crankshaft is called the rotation of the crank radius.
Top dead center and bottom dead center: When the piston moves in the cylinder, the highest point is called top dead center (or top dead center), and the lowest is called bottom dead center.
Working volume: The piston moves from top dead center to the next point, which is called cylinder volume (piston displacement shift).
Compression ratio: the degree to which the mixed gas of the engine is compressed.
The ratio of the total cylinder volume to the compressed cylinder volume (ie the volume of the combustion chamber) indicates that the air fills the cylinder. The larger the gas compression ratio, the more the gas is compressed within a certain range when the piston moves, and the gas temperature The higher the sum pressure, the higher the efficiency of the internal combustion engine.