Medical devices HS code mapping

What is Medical devices HS code mappinga car engine (What is a car engine?) Foreword: Automobile engines are an important invention in modern civilization, which affects people's way of travel, productivity and economic development, and has become an indispensable part of modern society. This article will explain from the aspects of introducing the history, structure, working principle, type and future development direction of the engine to help readers better understand the growth process and current situation of automobile engines. I. The history of automobile engines can be traced back to the early 19th century. At that time, in the budding period of the automobile industry, people began to use engines instead of carriages.Initially, car engines used steam engines and internal combustion engines, but because steam engines are large, heavy and need to be preheated, while internal combustion engines require more fuel and energy, which is uneconomical, limiting the promotion and application of automobiles. In 1899, German engineer Karl Benz designed the first four-stroke program automotive engine, which adopted a fuel-mixed injection system, which significantly improved the efficiency and power of the engine. Such an engine has brought a new opportunity for the invention of automobiles and has become an important milestone in the development of automobiles. II. Constructing an automobile engine is a system composed of multiple components, including cylinders, pistons, connecting rods, crankshafts, valves, gasoline pumps, etc. These components have different functions and work together to complete the work of the engine. Engine'sThe cylinder is a longer stainless steel cylinder. The interior is divided into several equal parts, called the cylinder volume. Each cylinder is connected to a piston. The piston moves up and down in the cylinder to inhale and discharge the mixed gas. The connecting rod is connected to the piston. The connecting rod is connected to the crankshaft, which drives the crankshaft to rotate when the piston moves. The valve connects the cylinder and the gasoline pump, which controls the inlet and out of the mixed gas and ensures the smooth operation of the engine. III. Working principle The working principle of automobile engine is to quickly burn the energy generated by fuel and air, promote the piston to move up and down, and then conduct energy. The car engine is an internal combustion engine, which drives the car by burning the fuel in oxygen to expand the mixed gas, thus promoting the crank movement of the piston and generating power to drive the car. Car engines can be divided into four stages to describe the working principle: intake stage, compression stage, combustion stage and exhaust stage.The air intake stage is when the air in the cylinder enters the cylinder through the valve. The compression stage is that the piston compresses the air to a certain pressure. The combustion stage is that the fuel injector injects fuel into the cylinder, and the mixed gas burns under the ignition of the spark plug, thus increasing the internal pressure. The exhaust stage is to discharge the exhaust gas from the cylinder after fuel combustion to complete a cycle. IV. Types of car engines can be divided into many types, including (1) gasoline engines (2) diesel engines (3) hybrid engines (4) electric engines, etc. Gasoline engine is the most common type of engine. It uses gasoline fuel and relies on the ignition system. During the rise of the piston, the mixed gas is compressed, triggering the spark plug to generate sparks, causing the fuel to burn, pushing the piston to move, and finally driving the vehicle. Diesel engines use diesel fuel, according toRelying on the high-pressure pump, the fuel forms a high-pressure mist state. When the air on the top of the cylinder is fully compressed, the oil mist is sprayed, and then the energy is converted into power through combustion. The hybrid engine is composed of a fuel engine and an electric motor, which can use the internal combustion engine and electric motor to drive the vehicle together, save fuel and reduce the carbon emissions of the vehicle. V. Future development direction In the future, automobile engines will face more challenges and new opportunities. In order to adapt to the needs of economy, environmental protection and energy, more intelligent, environmentally friendly and efficient new engines will be adopted. For example, the engine will be turned to electric. The progress of power storage and power conversion technology is expected to be more mature, and environmentally friendly and efficient new vehicle batteries will be developed and applied in the field of electric vehicles. In addition, the use of fuel cells will be another trend. Fuel cells will use fuel and oxygen.Reaction, the electricity transmitted from the battery to different components through electrochemical reaction, can replace electric and fuel engines to achieve a more environmentally friendly and efficient power source. Conclusion: The development process of automobile engines has witnessed the progress of human industrial revolution, socio-economic development and technological innovation. In the future, automobile engines will face more severe challenges and opportunities, creating a more efficient, environmentally friendly and intelligent power system, which will become an indispensable part of mankind.

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