How does a diesel engine work?

December 24, 2024

The working principle of a diesel engine is based on the combustion process of diesel fuel, which is divided into several important steps:

1.Intake process: When a diesel engine is in operation, air is first drawn in through the intake valve. At this time, no fuel is added, only pure air into the cylinder.

2.Compression: The air entering the cylinder is compressed by the piston moving upwards. The compression ratio is usually high, which causes the temperature inside the cylinder to rise significantly, reaching approximately 700°C to 900°C. The compression ratio is usually high.

3.Injection and combustion: As the piston approaches top dead center, injectors atomize the diesel fuel and spray it into the hot, pressurized cylinder. The diesel fuel ignites spontaneously at high temperatures and then undergoes rapid combustion, resulting in the production of high-temperature, high-pressure gases.

4.Work process: the high pressure gas produced by combustion pushes the piston to move downward, which is converted into mechanical energy. The movement of the piston is connected to the crankshaft through a connecting rod, which rotates to drive a car or other mechanical device.

5.Exhaust process: When the piston moves to lower dead center, the exhaust valve opens and the combustion exhaust gas is pushed out of the cylinder, ready for the next round of work.

Diesel engines are widely used in heavy-duty vehicles and industrial machines due to their high efficiency, high torque and good fuel economy. If you have more in-depth interest or questions about certain aspects of diesel engines, feel free to let me know!

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