What is the working process of a diesel engine?

[LaJuliet]

Diesel engine operation is divided into four strokes: intake, compression, power, and exhaust. Below is a detailed introduction to the diesel engine: Diesel engine intake: Air is drawn in. Before the piston reaches the top dead center, the intake valve opens, and the exhaust valve closes. When the piston moves past the top dead center and descends, intake begins, usually assisted by a turbocharger. Diesel engine compression: Compression involves compressing the air in the cylinder, which also raises the air temperature. At the end of the compression stroke, the fuel injector sprays diesel into the cylinder. The diesel ignites upon contact with the high-temperature air, initiating the power stroke. When the piston moves past the bottom dead center, the exhaust valve closes, and the piston moves upward to begin compression. Diesel engine power stroke: When compression reaches the top dead center, the diesel ignites and begins to expand, pushing the piston downward to perform work. Diesel engine exhaust: Before the piston reaches the bottom dead center, the exhaust valve opens. During the piston's upward movement, exhaust begins and continues until the piston moves past the top dead center, when the valve closes. Near the top dead center, both the intake and exhaust valves may open simultaneously, creating the valve overlap angle. Diesel engine ignition method: The diesel engine uses compression ignition, with no spark plug but a fuel injector. At the end of the compression stroke, the diesel sprayed by the injector encounters the compressed high-temperature air and ignites. Compared to gasoline engines, diesel engines are more efficient and are typically used in large vehicles.