![]() The internal combustion engine completes a complete cycle (4 strokes) and the crankshaft rotates 720°. In the four strokes, the direction of piston movement changes in the two adjacent strokes. The four strokes of a 4-stroke internal combustion engine are as follows: ![]() It is worth noting that the internal combustion engine only outputs energy outwards in the third stroke (the stroke of the piston moving to the bottom dead center during combustion), and the energy in the other strokes is provided by the rotational energy of the flywheel. The four cycles correspond to a complete cycle of the internal combustion engine. Four-stroke engines are widely used in current internal combustion engines due to their high ventilation efficiency. The 4-stroke technical terminology is a four-stroke cycle. It was first proposed by Nikolaus Otto in 1876 and is also known as the Otto cycle. The four strokes of a four-stroke engine refer to intake, compression, combustion, and exhaust. ![]()
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