Cummins NTA855-C450 Construction Machinery Engine With PTO

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The working principle of Cummins NTA855 diesel engine
The Cummins NTA855 diesel engine operates on a "four-stroke" cycle, and its principle is as follows:
1) Intake stroke: The piston moves from the top dead center to the bottom dead center under the drive of the crankshaft. At this time, the intake valve is open and the exhaust valve is closed. When the crankshaft rotates, the intake valve closes and the intake stroke ends.
2) Compression stroke: At the end of the intake stroke, the piston is still driven by the crankshaft to move from the bottom dead center to the top dead center. At this time, the volume inside the cylinder decreases, and both the intake and exhaust valves are closed. When the piston reaches the top dead center, the compression stroke ends, and the crankshaft rotates another 180°. The piston compresses the air, increasing its pressure to 3.5 MPa to 4.5 MPa and raising the temperature to 110°C to 150°C.
3) Power stroke: At the end of the compression stroke, the air inside the cylinder is at high pressure. At this time, fuel is injected into the high-temperature and high-pressure air through the fuel injector. Due to the high temperature of the compressed air, it ignites spontaneously. Under the push of the combustible mixture, the piston moves from the top dead center to the bottom dead center, converting the reciprocating linear motion of the piston into the rotational motion of the crankshaft, thereby outputting power.
4) Exhaust stroke: Under the release of energy from the flywheel, the crankshaft drives the piston through the connecting rod to move from the bottom dead center to the top dead center. At this time, the exhaust valve is open and the intake valve is closed. As the pressure inside the cylinder gradually increases, the exhaust gas is expelled from the cylinder through the exhaust valve.

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