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National 6 engine: Towards a cleaner,DigiPlus energy-saving and intelligent future. With the continuous improvement of global environmental awareness, automobile exhaust emissions have become one of the important issues restricting the healthy development of the automobile industry. On July 1, 2020, China promulgated and implemented the sixth phase emission standard (GB 18352.6-2016), marking that China's automobile emission standards have entered the strictest stage in the world. In order to meet the requirements of the national six standards, automobile manufacturers not only need to strengthen research and development and innovation in many aspects such as body, safety and intelligence, but also need to make breakthrough progress in engine technology. Therefore, the National 6 engine has become one of the most concerned focuses in the automobile industry. I. The core indicators required by the new technology revolution brought by the national 6 engine include nitrogen oxide (NOx) emissions, non-methane total hydrocarbon (NMHC) emissions and particulate matter (PM) emissions. Compared with the national five standards, the requirements of the national six standards on these three indicators are more than 70%, 50% and 80% stricter respectively. How to meet such high requirements is a huge technical challenge for car manufacturers in the car market.First of all, the requirements of the national 6 engine for combustion control technology are stricter and more efficient. Based on the existing production technology level and material reserve, reduce the oxygen content in the combustion chamber and master the best fuel combustion technology, such as reasonable fuel injection technology, multi-point ignition flame cutting-edge technology, dynamic fuel injection distribution, multi-spark fire line technology, etc. are the current mainstream technical routes. In addition, the exhaust recirculation technology of the engine, including exhaust recirculation and exhaust recirculation, can also effectively reduce the emission of NOx. Secondly, the requirements of the National 6 engine for exhaust gas post-treatment technology have been raised by two steps. The core of the exhaust gas post-treatment system is the emission control device, including oxygen sensors, catalysts and particulate filters, which play a key role in NOx redox, PM capture and NOx storage and regeneration.In addition, SCR urea catalyst and particulate emission reduction technology are also widely used. Finally, the requirements of the national 6 engine for the intelligent control system have also been significantly improved. By installing sensors, ECUs and other modules, the processing capacity of engine controllers and automobile controllers can be improved, so as to achieve more intelligent and accurate control. Specifically, the technical route of precision control mainly includes engine command control, variable condition control and threshold control, etc. II. The far-reaching impact of the National 6 engine With the popularization of the National 6 engine, it will bring far-reaching impacts in many aspects. First of all, the popularization of the National 6 engine will further improve the technical level of China's automobile industry. Under the National 6 standard, strict emission requirements, complex control systems and high-performance research and development needs will promote automobile manufacturers to constantly pursue breakthroughs and innovations in technology.This can not only improve the competitiveness and independent innovation ability of domestic suppliers, but also lay a solid foundation for the upgrading and development of the industrial chain. Secondly, the promotion of the National 6 engine will stimulate the ecological transformation and upgrading of the industry. Compared with the national 5 standard, the national 6 engine has made a leap forward, but for more stringent environmental protection requirements and energy-saving requirements, China's automobile industry still needs to pursue higher goals. Against this background, emerging industries such as new energy vehicles and car sharing will usher in major development opportunities, and at the same time, they will drive the development of industrial chains such as vehicle insurance and charging facilities. Finally, the application of the National 6 engine will also have an important impact on the environment. Because the National 6 engine can reduce harmful substances in automobile exhaust to an extremely low level, it can curb the air pollution situation, which is of great significance to protecting the environment and human health.III. The challenges faced by the National 6 engine and the technical difficulty of the National 6 engine are very high, so it also faces many challenges and limitations in the practical application process. Among them, it mainly includes problems such as fuel quality that does not meet the standard, excessive technical cost, inadequate policy guidance, and low user acceptance. To solve these problems, we need the joint efforts of the industry, the progress of science and technology and the coordinated development of industry. In the future, the National 6 engine will continue to move towards a cleaner, energy-saving and intelligent future. In terms of technology, future engine technologies such as fuel-electric hybrid technology, new motor technology, and new turbocharging technology will become a hot spot in the industry. In terms of application, continuously improving industry standards and quality, strengthening market supervision and legal policy management, and paying attention to consumer demand and the sustainable development of the industry will be key factors in promoting the China 6 engine to move towards a greener, more intelligent and humanized future.In a word, the National 6 engine is not only an important sign of technological progress and environmental protection development in the automobile industry, but also a microcosm of our continuous efforts to pursue a green future and improve the quality of life. Welcome the national six standards and strive to open up the future!

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