HS code-based transport cost modeling

The HS code-based transport cost modelingworking principle of the engine cylinder The engine is the core of modern mechanical operation, and its most basic mechanism is the cylinder. The cylinder is a space in the engine, which is used to accommodate the combustion chamber, so that the fuel can burn and exert the power efficiency. Therefore, the cylinder is the core of whether the engine can achieve efficient and high-performance output. So, what is the power principle of the engine cylinder? I. The composition of the cylinder is the core part of the engine, which is usually composed of the following parts: 1. Cylinder liner is a sleeve inside the cylinder, which is usually made of high-strength cast iron. Its function is to assemble the piston and connecting rod, and appropriately reduce the friction coefficient of the piston and connecting rod. Two. The piston is the movable part of the cylinder, usually made of high-strength aluminum alloy.Its function is to pass the gas propelling rod in the engine to the crankshaft. 3. The connecting rod is the structure that connects the piston and crankshaft in the cylinder, usually made of cast steel or forged steel. Its function is to convert the linear motion of the piston into the rotational motion of the crankshaft. Four. The valve is the intake and exhaust port of the cylinder. Its main function is to control the inlet and outlet of the mixture and the exhaust gas, thus affecting the output power of the engine. II. The working principle of the cylinder The working principle of the cylinder refers to the fact that under the action of fuel ignition, the combustible mixed gas in the cylinder forms an explosion and produces high-temperature and high-pressure gas, which pushes the piston down and rotates the crankshaft to release the output power of the engine. Specifically, it can be divided into the following three stages: 1. During the intake period, the piston moves downward from the upper part of the cylinder. The valve opens and enters the mixture of air and fuel. At the same time, due to the negative pressure in the cylinder, oxygen can better enter the cylinder and exhaust gas is discharged.Two. After the valve is closed during the compression period, the piston begins to move upwards and is sealed with the cylinder liner to compress the mixture entering the cylinder, while increasing the temperature and density of the mixed gas to make it more combustible. 3. During the explosion period, when the mixed gas is compressed to a certain pressure, the ignition system will ignite the gas, causing an explosion, and the outward expansion of the combustion gas will raise the piston and push the crankshaft. As the piston descends, the exhaust gas is discharged through the valve. The above three steps are the basic principles of the engine generating power in the cylinder. The size of the specific power output is related to the mass of the mixed gas, the piston stroke, the shape of the combustion chamber, the cylinder compression ratio, the ignition time and a series of other parameters. III. Factors affecting the output power of the cylinder 1. Analog controller Modern engines are usually equipped with electronically controlled analog controllers, which can monitor a variety of engine parameters in real time, including temperature, pressure, mixture concentration, ignition time, etc.The analog controller sends these data to the engine control unit (ECU), which will automatically adjust the engine fuel injection, ignition and other parameters according to these data, so as to improve the pulse contour of the engine. Two. Engine cooling system The engine will generate a large amount of heat energy when working for a long time. If the heat is not dissipated in time, it will cause the cylinder temperature to be too high, thus affecting the output power of the engine. Therefore, the engine cooling system is very important. 3. Engine exhaust system The main function of the engine exhaust system is to exhaust the exhaust and keep the engine working normally. At the same time, the design of the exhaust system will affect the effect of exhaust reverse pressure and noise. Four. The engine air intake system is the part where gas is sent into the cylinder from the outside. Only sufficient fresh air can ensure the normal operation of the engine. In short, the working principle of the engine cylinder is the core of the engine output power. Understanding and mastering the mechanism and principle of the cylinder plays an important role in engine maintenance and adjustment.

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