If we look at the performance parameters, there is a strange phenomenon in the internal combustion engine market: domestic and foreign companies produce almost the same internal combustion engine products, but the products produced by multinational companies firmly occupy the high-end market, the local internal combustion engine brand can only be free in the low-end market. Yang Shengji, deputy secretary-general of the China Association of Automobile Manufacturers, raised this phenomenon. He believes that the lack of reliability of China's internal combustion engine products is the main reason for the product to be free in the low-end market.

Today, energy conservation and environmental protection have become themes of internal combustion engines. The technical problems that hinder the development of internal combustion engines remain. On April 23, the website of the Ministry of Industry and Information Technology released the 27th Announcement of 2014, announcing that the use of diesel vehicles that are applicable to the third phase of the national automobile emission standard (hereinafter referred to as "National III") will be abolished since December 31, 2014. "Announcement", on January 1, 2015, the three diesel vehicles will not be sold, and the national standard will be formally implemented. This has brought more challenges to the reliability of internal combustion engine products, standardized various technical regulations, adopted a common and mature technical route, and raised industry-related standards to promote the reliability of internal combustion engines. This has become a concern for everyone.

Emissions upgrades challenge reliability

Lu Zhuohua, deputy general manager of Dongfeng Cummins Engine Co., Ltd., mentioned: “Energy-saving and emission-reduction require improving the engine's combustion efficiency, cylinder pressure, heat load, and injection pressure. These are challenges to the reliability of the internal combustion engine and require the internal combustion engine to be in the process of research and development. Significant improvement in material application, component tolerance, high mechanical load, heat load, friction and wear capabilities."

Liu Xiaojun, director of Nanyue Electronic Control (Hengyang) Technology Co., Ltd., believes that due to continuous increase in injection pressure and power requirements, the reliability requirements for products are getting higher and higher, and companies are faced with the challenge of weak heat treatment process, because there is no deep research on the applied materials. As a result, early wear and tear or even failures often occur, which greatly reduces the reliability of the product. In addition, the emission upgrades have higher and higher processing precision and technical requirements. Some companies have poor design and processes that directly affect the reliability of the products.

Wu Yang, director of Wuxi Weifu Leader Purifier Co., Ltd., said that at the present stage, China faces the late start of diesel exhaust post-treatment research and the fast upgrade of emission standards, and reliability research requires a large amount of basic data, feedback and improvement of actual measurement. In the short term, the completion of research and development, reliability research, batch production process development, and rapid increase in production capacity are undoubtedly huge challenges for domestic post-processing companies.

Large environmental impact

However, in a specific application, it is not only technology that affects safety and stability. Liu Xiaojun believes that user habits and use of the environment are also one of the important factors affecting product reliability. Even if it is a mature Bosch common rail system, the reliability performance in the Chinese market is also very different from the European and American markets.

Jiang Wenhu, head of the engine department of FAW Technology Center, believes that Chinese users, especially truck users, have complicated use, overloading, improper maintenance, fuel oil and oil products are all confusing, and the poor grade oil market is still commonplace. Engine reliability is a big challenge.

Liu Yang believes that in use, the quality of diesel fuel will directly affect the reliability of post-processing. Euro II and below oils can cause the SCR catalyst to fail, resulting in blockages in the entire system. Excessive sulfur content in the oil will also have a significant impact on PM emissions. In addition, post-processing systems require corresponding use requirements and maintenance methods. For example, the SCR system must be filled with urea, and it is necessary to use the knowledge of the entire vehicle user to understand why the vehicle has to spend extra money on urea. At the same time, it is also necessary to consider the need to strengthen the monitoring of OBD if it actually violates the use requirements or the failure of individual components has occurred in the system. In order to avoid the failure of individual components caused by the failure of the entire system.

Liu Wenhu said that the problem of overloading and oil products cannot be the reason for the low reliability of the whole vehicle. The automaker has adopted a market with standardized management, and at the same time, it has also developed a complete machine and vehicle that is suitable for the conditions of use in China through reliability design and development. The FAW Quality Winning Strategy clearly puts forward the goal of reducing the overall vehicle failure rate and prolonging the life of the entire vehicle, and will gradually increase the stability of the entire vehicle.

Increasing reliability is not only a technical issue

Ye Shengji believes that the internal combustion engine as the heart of the engine, its reliability has a direct impact on the reliability of the vehicle, this is not a simple technical problem, but a strategic issue affecting the size of the company's industry.

Because of this, major host plants and parts and components companies attach great importance to engine stability, and continue to invest in research and development, production and other aspects of investment.

It is reported that companies such as Weichai, Yuchai, Xichai, and Dongfeng Commercial Vehicles have actively explored the application of reliability technology and gained valuable practical experience. On the other hand, various research institutes and universities at home and abroad, such as the Massachusetts Institute of Technology, USA The foundational research on the reliability of internal combustion engines, such as the University of Wisconsin and Tsinghua University, has become increasingly in-depth and has achieved many phased results; these have played a significant role in the research and application of reliability technologies in the internal combustion engine industry.

Wang Zhijian, director of Weichai Power Technology Center, introduced that Weichai Power attaches great importance to reliability research. The company recruits an internationally renowned team of experts in the field of reliability, and conducts reliability research projects with major consulting agencies and universities to establish a system. From the component to the engine reliability research process and specifications, it invested nearly 1.5 billion yuan to build an internationally advanced key laboratory for the reliability of internal combustion engines, and carried out a lot of research in the fields of mechanical fatigue, friction and wear, seal and fastening, and the use of internal combustion engines. Reliability The International Technology Innovation Alliance platform has driven the entire industry in the country to improve its reliability. "More reliable and durable parts can greatly extend the life and durability of the engine, reduce the need for energy materials in the repair, scrap, remanufacturing, and even new engine purchases, while reducing the emission pollution caused by the deterioration of engine use. "Lu Zhuohua introduction.