The advantages of diesel engines in loaders are high torque and good fuel economy. The working process of a diesel engine shares many similarities with that of a gasoline engine, with each working cycle involving four strokes: intake, compression, power, and exhaust.
However, because the diesel engines used in small loaders use diesel fuel, which has a higher viscosity than gasoline and is less prone to evaporation, while its auto-ignition temperature is lower, the formation of the combustible mixture and the ignition method differ from gasoline engines.
The main difference is that the air-fuel mixture in a diesel engine cylinder is compression-ignited, not spark-ignited. When a diesel engine is running, air enters the cylinder, and when the air in the cylinder is compressed to its final pressure, the temperature can reach 500-700℃, and the pressure can reach 40-50 atmospheres.
When the piston approaches top dead center, the fuel injector of the fuel supply system injects fuel into the cylinder combustion chamber at extremely high pressure in a very short time. The diesel fuel forms fine oil droplets, which mix with the high-pressure and high-temperature air. The combustible mixture burns spontaneously, expands violently, and generates explosive force, pushing the piston downward to do work. At this time, the temperature can reach 1900-2000℃, the pressure can reach 60-100 atmospheres, and the torque generated is very large. Therefore, diesel engines are widely used in large diesel equipment.
