WTO harmonization and HS codes

* Automobile engine structure diagram (detailed explanation of automobile engine structure) Automobile engine is WTO harmonization and HS codesthe heart of the automobile, and its performance directly affects the performance and service life of the whole vehicle. In a vehicle, the engine is the most important power component. Therefore, it is very necessary for people who like cars to understand the structure and principle of car engines. Automobile engine structure The main components of automobile engine include engine body, rectifier, fuel system, ignition system, lubrication system, cooling system and exhaust system.The structure of these parts will be introduced separately below. 1. Engine body Engine body is the main part of the car engine. It includes cylinder block, cylinder head, crankshaft, connecting rod, piston and valve, etc. The engine burns the mixture of fuel and air through these components, thus generating power and driving the car. The cylinder block and cylinder head are the skeleton of the engine structure. In the cylinder on the cylinder block, the piston can move back and forth, and the valve is located between the cylinder block and the cylinder head, which is installed in the cylinder block by matching the set. The crankshaft is located at the bottom and is used to convert the connecting rod movement into rotational motion to drive the car. In the manufacturing process of the engine body, in order to increase the air flow rate, reduce the weight of the engine and reduce heat loss, the engine housing and cylinder wall are made of cast or die-cast aluminum alloy materials. Two. Rectifier rectifier is to sendThe exhaust gas discharged by the engine is treated, converted into pure air and then sent into the fuel system and ignition system to ensure the efficient operation of the engine. The principle of commonly used rectifier aerobic sensors and ternary catalysts is to convert harmful substances in the exhaust gas into harmless gases through catalysts, so as to reduce environmental pollution. 3. Fuel system The fuel system of automobile engines mainly includes fuel tanks, fuel pumps, fuel filters, fuel injectors and fuel pressure regulators, etc. The main function of the fuel system is to supply the fuel in the fuel tank to the engine, and at the same time inject it into the cylinder through the fuel injector to mix it with the air to form a combustible mixture, thus causing a combustion reaction and making the engine start. Four. Ignition system The main function of the ignition system is to provide high-voltage electrical signals, so that the sparks on the spark plug ignite the fuel in the combustion chamber, causing an explosive reaction and driving the car.The ignition system generally includes components such as ignition coil, storage battery, spark plug and ignition control module. 5. Lubrication system Lubrication system is one of the key components of engine operation. Its main function is to introduce lubricating oil into the engine to form a lubrication film, reduce friction, reduce the wear of parts, and take away the heat inside the engine to maintain the normal temperature of the engine. 6. The main function of the cooling system is to introduce the coolant in the engine radiator into the engine through the circulation pump, so as to take away the heat inside the engine and maintain the normal temperature of the engine. At the same time, the cooling system can also maintain the stability of the lubricating oil and extend the service life of the lubricating oil, which is also very important for the service life of the engine. 7. Exhaust system The exhaust system is a channel for the exhaust gas generated inside the engine. Its main function is to reduce environmental pollution.Common exhaust systems include exhaust pipes and silencers. The principle of automobile engine The working principle of the engine is to introduce the mixed gas into the cylinder, ignite it and explode. Through the back and forth movement of the piston, the piston touches and pushes the crankshaft, generating a rotational movement to drive the vehicle. This process needs to complete four basic steps: 1. Air intake In the process of air intake of the car engine, the air is filtered and mixed by the air filter outside the cylinder and then sucked into the car engine and mixed with fuel into fuel. Two. Compression is the second stage of the engine, which aims to compress the fuel just mixed into a high-pressure state. In this process, the generated high temperature and high pressure compress oxygen and fuel to the limit. 3. In the high-pressure state, the sparks generated by the ignition system ignite the fuel and cause an explosive reaction. The generated heat energy is converted into mechanical energy to promote the piston to rise rapidly.Four. After the exhaust engine is burned, the exhaust valve opens, and the exhaust gas accumulated in the combustion chamber is discharged from the engine through the exhaust pipe system. In summary, the car engine is one of the most important parts of the car. For those who like cars, understanding the structure and principle of the engine can better understand the performance and maintenance skills of the car. The engine parts introduced in this article include engine body, rectifier, fuel system, ignition system, lubrication system, cooling system and exhaust system. And the basic principle of engine operation is introduced, including the four steps of air intake, compression, explosion and exhaust. Understanding the principle and structure of the engine can help us better understand the car, and also help to carry out car maintenance.

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