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* Diesel engine is Global trade intelligence forumsa common internal combustion engine. Its main principle is to use fuel (diesel) to spontaneously combust under high pressure to drive the engine. This article will elaborate on the principle, structure, application and development trend of diesel engines respectively. I. The principle of diesel engine The principle of diesel engine is mainly based on the principle of thermal cycle of the internal combustion engine, that is, an engine that expands the gas by burning fuel to drive the piston. Diesel engines are characterized by high efficiency, economy and low noise. Compared with gasoline engines, diesel engines have high compression ratio, low spontaneous ignition point and high combustion efficiency. The working principle of the diesel engine is that the fuel is atomized into micro in a high-pressure environment.Small particles, and then mixed with high-temperature and high-pressure air to form combustible gases, which burn to produce high-temperature and high-pressure gases, causing the piston to move down and drive the engine to work. II. Structure of diesel engine The structure of diesel engine is composed of engine body and supporting system, including four major parts: fuel supply system, cooling system, lubrication system and start-up system. Fuel supply system: The fuel supply system includes fuel tank, oil pump, oil nozzle, high-pressure oil pipe and fuel injector and other parts. The main function is to store the fuel in the fuel tank, deliver it to the high-pressure oil pipe through the oil pump, and then atomize and spray it by the fuel injector. Cooling system: The cooling system consists of a water tank, a water pump, a radiator, a fan blade and other parts. The main function is to emit a large amount of heat energy generated when the engine is running and keep the engine at a suitable operating temperature.Lubrication system: The lubrication system is composed of oil pump, oil filter, oil span shell, oil pressure gauge and other parts. The main function is to maintain sufficient lubrication between the moving parts, reduce friction loss, and prevent excessive wear, so as to extend the service life of the engine. Start-up system: The start-up system includes batteries, generators, starters and other parts. The main function is to charge the engine and start the engine through the starter. III. Application of diesel engines Diesel engines are widely used in locomotives, automobiles, ships, agricultural machinery, engineering machinery, generator sets and other fields, and all have their advantages. Locomotive: Diesel locomotive has the characteristics of large carrying capacity, strong tensile force, economy and reliability, convenient maintenance, etc. It is the first choice locomotive for railways, mines and other occasions. Automobiles: Diesel vehicles have the advantages of strong power, low fuel consumption, low maintenance costs, etc., especially heavy-duty passenger trucks, off-road vehicles, etc. are widely used.Ships: Ships equipped with diesel engines mainly include bulk carriers, tankers, passenger ships, etc. The advantages are low risk and good economic benefits. Agricultural machinery: Diesel engines are mainly used in tractors, rice transplanters and other agricultural machinery. Their advantages are strong power, high horsepower and fuel economy. Construction machinery: Diesel engines are mainly used in excavators, bulldozers and other construction machinery. Their advantages are strong power and less fuel consumption. Generator set: Diesel generator set is mainly used for emergency power and small power needs, such as families, small businesses, etc. IV. The development trend of diesel engines. Since its launch, diesel engines have been continuously upgraded and optimized in terms of technology and application. In the future, the development trend of diesel engines will focus more on green environmental protection and intelligence. Green environmental protection: With the increasing awareness of global environmental protection, notDiesel engines will pay more attention to environmental protection, and achieve more environmentally friendly engines by reducing emissions and reducing the pollution of exhaust gases to the environment. Intelligence: With the rapid development of intelligent technology, diesel engines will be more intelligent in the future. Through the introduction of artificial intelligence and automatic control technology, automated operation will be realized and the intelligence level of engines will be improved. In a word, diesel engines, as an important internal combustion engine, are not only widely used but also constantly upgraded in technology. In the future, diesel engines will usher in greater development opportunities and challenges.

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