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Engine EGR: the core of exhaust gas recycling technology With the increasing prominence of global environmental pollution,Real-time customs duty updates various environmental protection technologies are also more and more widely used in the automotive field. ThatAs a very important technology, exhaust gas recycling technology (EGR) has become a core component of modern automobile engines. In this article, we will explore EGR technology in depth and analyze its working principle as well as its advantages and disadvantages. I. Overview of EGR technology Exhaust gas recycling technology was first applied to diesel engines, the main purpose of which is to reduce nitrogen oxide (NOx) emissions. With the continuous development of gasoline engines, EGR technology is also gradually applied to gasoline engines to reduce emissions. Simply put, EGR technology is to send a certain amount of exhaust gas back to the intake duct of the engine through the pipe, mix it and then burn it. This can reduce the temperature in the combustion chamber and reduce the generation of NOx. At the same time, it can improve combustion efficiency and reduce fuel consumption, so as to achieve the purpose of energy saving and emission reduction.II. Working principle of EGR technology EGR technology controls the oxygen concentration during combustion by adjusting the amount of exhaust gas in the intake channel, so as to achieve the purpose of reducing NOx emissions. The main components of the EGR system include EGR valves, EGR coolers, EGR pipes, etc. When the engine is running, the EGR valve will gradually open and send part of the exhaust gas back to the intake airway for mixed combustion. At the same time, the EGR cooler will also play an important role in cooling these exhaust gases and then sending them back to the intake airway. This can avoid problems such as excessive exhaust temperature and explosion in the combustion chamber. In addition to controlling the oxygen concentration in the intake, EGR technology can also achieve a variety of functions. For example, by controlling the exhaust gas recovery, the power and torque output of the engine can be adjusted; by adjusting the distribution of EGR airflow, applications such as adaptive control and low-temperature start-up can also be realized.III. Advantages of EGR technology 1. Reduce NOx emissions. The main purpose of EGR technology is to reduce the temperature in the combustion chamber and reduce the generation of NOx. Compared with traditional jet gasoline engines, NOx emissions can be reduced by more than 30% after using EGR technology. Two. Improve fuel efficiency. By using EGR technology, the oxygen concentration in the intake can be adjusted, the combustion temperature can be reduced, and the combustion efficiency can be improved, so as to reduce fuel consumption. The actual test found that after using EGR technology, the fuel economy can be improved by about 2% to 5%. 3. Reduce engine deposition EGR technology can circulate particles and other impurities in the exhaust gas back to the engine, reducing the corrosion and damage of these impurities to the intake and exhaust systems. This can not only protect the relevant components, but also ensure the long-term operation of the engine.IV. Disadvantages of EGR technology Although EGR technology has brought many benefits, it also has some disadvantages and limitations. The following are some common shortcomings: 1. Increase the oil temperature of diesel engines. EGR technology is more widely used in diesel engines, but it will increase the oil temperature of the engine, resulting in an increase in the loss of the lubrication system. Two. Increase the failure rate. EGR technology requires the use of multiple electronic control systems and fine mechanical equipment, so its failure rate is relatively high. Once a failure occurs, it may cause the engine to work abnormally. 3. It is easy to cause carbon accumulation. Because the exhaust gas contains residual impurities and particles, if the amount of exhaust gas recirculation is too high, it will lead to carbon accumulation in the intake tract and combustion chamber, affecting the operation of the engine. V. Summary EGR technology is an environmental protection technology widely used in the automobile field at present.It achieves the purpose of reducing emissions and fuel consumption by sending a certain amount of exhaust gas back to the intake duct of the engine, mixing and burning. EGR technology has many advantages such as reducing NOx emissions, improving fuel efficiency and reducing engine sedimentation, but it also has some limitations and disadvantages. Therefore, in practical application, it is necessary to choose the appropriate EGR technology according to different car types and usage environments, and do a good job in relevant maintenance and upkeep to ensure the normal operation of the engine.

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