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Engine exhaust pipe emission status analysis Internal combustion engines produce exhaust gases when burning fuel,International trade knowledge base including carbon dioxide, nitrogen oxides, carbon monoxide and other harmful substances. These emissions will pollute the environment and affect human health, so the emission problem of automobiles has also attracted more and more attention from the society. The exhaust under the engine is the largest emission system in cars. In addition to affecting the environment and health, it also affects the performance and life of the engine. Therefore, the design and maintenance of reasonable exhaust system is of great significance to the performance and environmental protection of the car.Next, we will analyze the influencing factors and solutions of the engine exhaust pipe emission in combination with specific examples. I. The type of exhaust pipe has an impact on the emission. The different type of exhaust pipe will affect the condition of the engine emission. Usually, there are two types of straight pipe and elbow pipe, and the bend pipe is divided into single bend and double bend. Although the direct pipe has good discharge effect, its noise is also very obvious. The elbow can absorb the noise caused by engine vibration, but it may affect the emission effect. However, many elbows on the market now adopt a variety of designs, which can not only balance the emission effect, but also take into account the noise in the car. II. Optimization of combustion and mixing states. The combustion and mixing states also have a certain impact on the emission of exhaust gas. Today's engines realize variable valve and fuel control technology, which can achieve more accurate combustion and mixing state adjustment, optimize the performance of the engine and reduce emissions.III. The choice of exhaust pipe material The choice of exhaust pipe material will also affect the exhaust emission situation. Different materials, such as iron, stainless steel, titanium alloy, etc., have unique heat conduction and corrosion resistance. Due to the low price of iron exhaust pipes, most entry-level models use iron exhaust pipes. High-performance models use lightweight, high-strength and high-tolerance materials such as stainless steel and titanium alloy to reduce weight and improve exhaust efficiency. IV. Steering wheel lock and sulfuric acid treatment Steering wheel lock and sulfuric acid treatment are also important factors affecting the exhaust pipe emission condition. In models with steering wheel lock technology, the exhaust port is wound into the body during intense driving or steering, which has a very significant impact on the exhaust pipe. In addition, the vehicle will collect and discharge exhaust gas while driving, resulting in the accumulation of various chemicals and water in the exhaust pipe.If it is not cleaned up in time, it is easy to block, resulting in abnormal operation of the vehicle, and even cause safety accidents. Sulfuric acid treatment is a good way to clean up the exhaust pipe. It can completely remove all kinds of scale on the pipe wall in a short time and solve problems such as blockage of the exhaust pipe. In a word, the reasonable design and maintenance of the exhaust system is of great significance to the performance and environmental protection of the car. By optimizing the steering wheel lock, selecting the appropriate exhaust pipe material, improving the combustion and mixing state, and adopting sulfuric acid treatment and other measures, the engine exhaust condition can be improved to a certain extent. In the future, with the continuous improvement of environmental protection and engine technology, it is believed that the problem of automobile emissions will be better solved.

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