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Engine classification and import export databaseworking principle analysis The engine is one of the core components of modern cars and drives the car. According to the operation mode and nature of the engine, it can be divided into several types. This article will analyze the classification of engines and their working principles in detail. 1. Classified according to thermal cycle (1) Reciprocating internal combustion engine Reciprocating internal combustion engine is a type commonly known as "gasoline engine". It uses high-temperature and high-pressure gas generated by the explosion of a mixture of air and fuel to apply force to the piston, thus pushing the crankshaft to rotate and then drive the car forward. Its thermal cycle is a "four-stroke cycle", which includes four links: intake, compression, combustion and exhaust, and the exhaust gas needs to be discharged through the pumping system.(2) Steam turbine is an internal combustion engine that uses high-temperature and high-pressure steam to drive the impeller to rotate, and finally drives the static to provide power. The thermal cycle of the turbine is the "Breton cycle", which can use a variety of different engine fuels, such as natural gas, coal, oil, etc. ( 3) Jet gas turbine Jet gas turbine is a dual-rotor or multi-rotor internal combustion engine, which uses an axial compressor and a combustion chamberless engine combination to provide power. It is mainly used in the fields of aviation and aerospace, and can also be used in ship power systems. ( 4) Steam engine Steam engine is an internal combustion engine that uses water to turn into steam to drive the impeller to rotate, thus generating power. During the early industrial revolution, steam engines were widely used in various fields because of their strong power and suitable for mass production.Two. Classified by working power (1) Gasoline engine Gasoline engine is a type of engine that uses gasoline as the main fuel and uses explosion to exert force on the piston. It has fast power response and strong power output, which is suitable for high-performance cars such as sports cars and racing cars. ( 2) Diesel engine Diesel engine is an internal combustion engine with diesel as the main fuel. It has high thermal efficiency and can produce high-pressure and high-temperature gas in the combustion chamber, so that the diesel engine has the characteristics of high torque and high power. It is one of the power sources commonly used in heavy vehicles such as industrial machinery and buses. ( 3) Electric engine Electric engine is a type of engine powered by electric energy. It mainly uses battery storage and feedback energy to drive the motor. Its uniqueness is that pure electric vehicles can also use generators to transmit power to the wheels. (4) Hybrid engine Hybrid engine is similar to electric vehicles. It uses the power of batteries and generators to enhance the power output of gasoline engines and reduce fuel consumption. At present, it has become an efficient and environmentally friendly engine type. In a word, the engine is one of the indispensable components of the car. The classification and working principle of the engine not only provide us with the basic knowledge of understanding the car, but also help us better care and maintain the car. In the future, with the application and development of new materials and new energy sources, the classification and working principles of automobile engines will become more and more complex.

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