HS code-driven tariff reduction strategies

Summary of research and HS code-driven tariff reduction strategiesanalysis of engine performance improvement: As the "heart" of the car, the engine plays a crucial role in the performance of the car. In order to improve the performance of the car, the engine is constantly researched and improved to improve its power, life and fuel economy. This paper analyzes and studies the current common engine performance improvement technologies, including improving the combustion process, increasing the air intake, optimizing the exhaust system, improving the efficiency of the ignition system, etc.Keywords: engine, performance improvement, combustion process, air intake, exhaust system, ignition system I. Introduction With the continuous development of the automobile market, people's requirements for automobile performance are getting higher and higher, especially for engines. The engine is the core component of the whole car, and its performance has a crucial impact on the power, economy and environmental protection of the car. Therefore, how to improve the performance of the engine is a hot topic that car manufacturers and consumers have been concerned about. II. Improving the combustion process is a key step in engine energy conversion. By optimizing the combustion process, the power and fuel economy of the engine can be improved. At present, the common combustion optimization technologies include: 1. Direct injection technology: directly injecting fuel into the cylinder can improve the fuel utilization rate and combustion efficiency, thus improving the power and fuel economy of the engine.Two. Deformed combustion chamber technology: Improve the combustion process by changing the shape of the combustion chamber and the temperature distribution of the combustion chamber wall and other factors, and improve the fuel utilization rate and combustion efficiency. 3. Eddy current technology: By introducing forced eddy current, the air-fuel ratio is uniform and the combustion rate of the mixture is increased, so as to improve the power and fuel economy of the engine. III. Increasing the air intake is one of the key factors that determine the output power and fuel economy of the engine. In order to increase the air intake, the following measures can be taken: 1. Increase the intake channel and intake throat to increase the intake volume. Two. Install a turbocharger or mechanical supercharger in the intake duct to increase the intake pressure and intake volume. 3. Multi-point fuel injection technology is adopted to make the position where the fuel is injected into the cylinder closer to the cylinder wall, so as to reduce the adsorption loss of mixed gas in the intake channel and improve the intake efficiency.IV. Optimize the exhaust system. Optimize the exhaust system can reduce the exhaust pressure, increase the negative pressure in the cylinder, and improve the intake efficiency and combustion efficiency, so as to improve the engine performance. The optimization of the exhaust system includes: 1. Increase the diameter of the exhaust pipe and reduce the exhaust pressure. Two. An exhaust system with an adjustable exhaust port is adopted to change the exhaust resistance and reduce the exhaust pressure by adjusting the opening and closing state of the exhaust port. 3. The variable valve timing technology is adopted to change the exhaust behavior and reduce the exhaust resistance by adjusting the opening and closing time of the valve. V. Improve the efficiency of the ignition system. The ignition system is a crucial part in the combustion process of the engine, among which the size and uniform distribution of ignition energy have an important impact on the performance of the engine. In order to improve the efficiency of the ignition system, the following measures can be taken: 1. Adopt an enhanced ignition coil to increase the size of the ignition energy.Two. Multi-point ignition and time-sparing ignition technology is adopted to improve ignition efficiency and distribution uniformity. 3. Add capacitors and other electronic components to the ignition system to stabilize the voltage of the ignition coil, so as to improve the efficiency of the ignition system. VI. Conclusion In summary, the improvement of engine performance is a very important research topic that needs continuous exploration and innovation. In practical application, you should consider various factors according to the environment and personal needs of the car, and choose the engine performance improvement technology that suits you.

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