As the largest automobile production and sales country in the world, in 2014, the production and sales volume of various types of internal combustion engines in China reached 82 million units. It is the world’s largest producer and sales engine for internal combustion engines. However, compared with the international advanced level, China still cannot be considered as a strong state of the internal combustion engine. Why? The biggest gap is the reliability of the internal combustion engine. This is the deputy president of Weichai Power Co., Ltd. De Dehui, the 4th International Symposium on Reliability Technology for Internal Combustion Engines held in Beijing on May 26, 2015. The seminar was sponsored by the Automotive Industry Association of the China Association of Automobile Manufacturers and co-organized by the International Reliability of Engines Alliance and other companies. More than a dozen experts from different angles and topics focused on increasingly stringent emission and fuel consumption regulations and their bringing to the internal combustion engine. The challenge is to develop technical discussions and exchanges on the reliability of the entire engine and key parts of the engine, the application of matching reliability of the internal combustion engine and the vehicle, and the friction and wear of the internal combustion engine. Jiang Wenhu, director of the engine development department of the Engine Department of FAW Technology Center, believes that the reliability of the engine refers to the ability of the engine to operate according to regulations under the specified conditions of use and maintenance, and it is generally evaluated by the failure rate. The durability of the engine is the ability of the engine to run normally before it reaches the limit state under normal use and maintenance conditions. It is a special expression of the reliability of the engine and is generally evaluated by the life of B10. The life of B10 refers to the mileage or time when there is a serious failure of 10% of the engine during the operation of the engine. Jiang Wenhu stated that defining the engine reliability and durability definition and evaluation index is the prerequisite for the development of engine reliability. Specific to FAW, in the planning stage of engine product development, the failure curve of the engine must be defined in detail, that is, the reliability level of the engine can be predicted in the planning stage. For example, in FAW's reliability model based on the failure model, the failure causes are analyzed and judged, such as structural design reasons, suppliers' technology and quality control levels, improper materials, or processes that do not meet the design requirements and potential. Failure analysis and other aspects. Jiang Wenhu believes that the market's true failure rate curve is a standard for evaluating engine development and quality assurance systems. It is also an input for the development of next-generation products, and the development of a reliable life cycle engine, improvement, upgrade, and replacement of the engine during the entire life cycle is a constant revision failure. Curve process. Also referring to reliability issues, Professor Shuai Shijin from the National Key Laboratory of Automotive Safety and Energy at Tsinghua University stated that the service life of diesel engines varies according to the type of vehicle they match. Generally speaking, the greater the diesel vehicle's loading quality, the higher its life expectancy; Europe's sixth phase emission regulations, the diesel engine life requirements than the fourth and fifth phase requirements are tightened by 40% to 60%; In the United States, after 2004, emission regulations for light and medium diesel engines have not been tightened. However, the service life has increased by 2 years. Heavy-duty diesel engine mileage has been tightened by 50%. China's diesel engine life requirements refer to the European system. As the core of a diesel engine, an electronically controlled common-rail fuel system, wear diagnosis is closely related to engine reliability. Dr. Zhang Zengteng, vice president of the Weichai Power Engine Technology Research Institute, described that in the injection valve wear control analysis software for injectors based on rotational speed oscillations, the injector orifices are changed due to abrasive wear. When it is large, the corresponding software can identify the amount of wear of the nozzle, and correct the actual fuel injection to protect the engine, and can provide corresponding prompts (such as alarm, limit torque, etc.) according to the extent of the nozzle wear. From the setting of fuel injection quantity to fuel injection quantity estimation, injector wear amount analysis, correction of MAP self-learning, correction factor, and external characteristic oil quantity correction, to the strategic framework of engine protection, it is possible to respond to the occurrence of nozzle wear. Program. For example, when the degree of nozzle wear is small, the amount of fuel injected by the engine can be limited within a reasonable range to prevent the engine from being damaged. When the degree of nozzle wear is large, the engine's emissions and performance deteriorate more severely. If the fuel injection quantity cannot be effectively improved by limiting the injection amount, the OBD (Onboard Diagnostic System) will be turned on or torque limiting measures will be taken and a new injector will be replaced. When talking about the verification of diesel injection system products, Qian Libin from Engineering Testing Department of Bosch Automotive Diesel Injection Systems Co., Ltd. introduced reliability requirements analysis, simulation calculations, robustness verification, and durability. A series of work such as verification, customer verification and product reliability tracking. For example, during robustness assessment of products, robustness tests based on load analysis can verify the robustness of diesel injection system components to oil lubricity, robustness to oil particle contamination, and robustness to extreme operating conditions. . Ultimately, high-quality, high-reliability products are formed through customer verification processes such as component testing, system durability testing, and vehicle testing. Ms. Ilona Weber, a project manager from AVL, believes that the development of a system requires in-depth knowledge of the system's usage conventions. The system's focus is on the typical use of various vehicle types. The vehicle's usage practices determine the dynamics. The use of the system, and different parameters will affect the use of the vehicle. During the development of AVL, for the engine and its components, an analysis of the load distribution should give specific load-specific details for the particular component. Through load curve analysis, load information of related components can be obtained as soon as possible, and better load evaluation and system usage evaluation can be obtained early in the project to ensure the progress of development and the accuracy of the layout. Prof. Shuai Shi introduced a lot of experiments and researches on the durability of heavy-duty diesel after-treatment systems. They are the DOC (diesel oxidation catalyst), SCR (selective catalytic reduction device), DPF Major components such as diesel particulate traps were subjected to a series of tests and studies including heat aging, sulfur poisoning, HC poisoning, high temperature deactivation, accumulation of sediments and ash, and proposed that the durability of the DOC directly affects the downstream DPF. In terms of SCR performance, DOC needs to be designed in accordance with the DPF regeneration strategy and post-treatment system layout scheme; however, there are many factors affecting the durability of SCR. Special attention should be paid to the selection of SCR catalyst materials and the control of sediments; for DPF, regeneration It is very important to control its durability. Accurate and reliable DPF regeneration control can effectively improve the durability of the DPF. Consistent with the issue of reliability of internal combustion engines, Xing Min, executive vice chairman and secretary-general of the China Combustion Engine Industry Association, pointed out that facing the “13th Five-Year Plan†for energy-saving emission reduction and green development in China's internal combustion engine industry, he pointed out that facing the international advanced commercial diesel engines, With the challenge of 1.6 million kilometers of B10 level, China is currently studying a reliability plan of more than 1 million kilometers, and will examine the entire life cycle of products from the perspective of sustainable development, emphasizing systemic development in the stage of product development according to the whole life cycle perspective. Analysis and evaluation. We are the manufactuer in China, We can supply the Covering Machine Spare Parts.
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