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Diesel Trainers

Nov 12, 2021

Diesel Engine and Diesel Engine Trainer

A diesel engine is an engine that burns diesel to obtain energy release. It was invented by German inventor Rudolf Diesel in 1892. To commemorate this inventor, diesel is represented by his surname Diesel, and the diesel engine is also called the Diesel engine ( Diesel engine).

The advantages of diesel engines are high torque and good economic performance. The working process of a diesel engine has many similarities to that of a gasoline engine. Each working cycle also undergoes four strokes of intake, compression, work, and exhaust. However, because the fuel used for diesel engines is diesel, its viscosity is greater than that of gasoline and it is not easy to evaporate, but its spontaneous combustion temperature is lower than that of gasoline. Therefore, the formation and ignition of combustible mixtures are different from gasoline engines. The main difference is that the mixture in the cylinders of diesel engines is compression-ignited rather than ignited. When a diesel engine is working, air enters the cylinder. When the air in the cylinder is compressed to the end, the temperature can reach 500-700℃, and the pressure can reach 40-50 atmospheres. When the piston is close to the top dead center, the fuel injector of the fuel supply system injects fuel into the combustion chamber of the cylinder at a very high pressure in a very short time. The diesel forms fine oil particles, which are mixed with high-pressure and high-temperature air, and the combustible mixture burns by itself. The violent expansion produces explosive force and pushes the piston down to work. At this time, the temperature can reach 1900-2000 ℃, the pressure can reach 60-100 atmospheric pressure, and the generated torque is very large, so the diesel engine is widely used in large diesel equipment.

The characteristics of traditional diesel engines: good thermal efficiency and economy. Diesel engines use compressed air to increase the air temperature so that the air temperature exceeds the spontaneous ignition point of the diesel. At this time, the diesel, diesel spray and air are injected while the diesel is mixed and the air is ignited and burned. . Therefore, the diesel engine does not require an ignition system. At the same time, the fuel supply system of diesel engines is relatively simple, so the reliability of diesel engines is better than that of gasoline engines. Due to the limitation of deflagration and the need for diesel self-ignition, the compression ratio of diesel engine is very high. Both thermal efficiency and economy are better than gasoline engines. At the same time, under the same power, diesel engines have large torque and low speed at maximum power, which is suitable for trucks.

However, diesel engines require high structural strength and rigidity due to high working pressure, so the diesel engines are relatively heavy and bulky; the fuel injection pumps and nozzles of diesel engines require high manufacturing precision, so the cost is high; in addition, diesel engines work rough , Large vibration and noise; diesel is not easy to evaporate, difficult to start when the car is cold in winter. Due to the above characteristics, diesel engines were generally used in large and medium trucks. Traditionally, diesel engines are relatively cumbersome, their power-raising indicators are not as good as gasoline engines (lower speed), noise and vibration are higher, and soot and particulate (PM) emissions are relatively serious. Therefore, they have rarely been favored by passenger cars. Especially with the new development of small high-speed diesel engines, a number of advanced technologies, such as electronically controlled direct injection, common rail, turbocharging, and inter-cooling technologies, can be applied to small diesel engines, and the shortcomings of the original diesel engines have been obtained. A better solution, and the advantages of diesel engines in energy saving and CO2 emissions cannot be replaced by all heat engines, including gasoline engines, and become "green engines."

Diesel common rail simulator on bench