In January 2016, the project “Tianji Low Noise Design Key Technology and Application†(hereinafter referred to as “Diesel Engine Low Noise Projectâ€) jointly undertaken by Tianjin University, Weichai and Yuchai won the “2015 National Science and Technology Progress Awardâ€. prize.
Anyone who can win the National Science and Technology Progress Award is bound to have outstanding innovations in a certain field, and the industrialization application effect is remarkable. On January 11th, the main accomplisher of the project, Shu Gequn, a professor at the School of Mechanical Engineering of Tianjin University, said in an interview with the reporter of China Auto News: "After more than 20 years of research, more than 10 years of industrial application, the innovative technology of the project has been It has been applied in 7 companies including Weichai and Yuchai and 36 models of 1.784 million diesel engines. It has helped China's engine manufacturers to cross the 3 to 4 technical stages of European noise regulations within 10 years, and has made positive progress in the technological progress of China's engine industry. Promote."
After the inspection of 1.784 million diesel engines
In 2014, experts from the China Machinery Industry Federation identified that the overall technology of diesel low noise projects has reached the international advanced level and is in the international leading level in the three-dimensional composite vibration reduction technology of crankshafts. "This project has developed a combustion noise control technology that suppresses the combustion of the internal combustion engine. It proposes a three-dimensional vibration composite damping and low-noise structure design of the internal combustion engine shaft. The diesel engine isolation and the particulate filter-based exhaust noise reduction design." This is Shu Gequn's introduction to the results of the foreign exchange report project. For decades, Shu Gequn has been working on low-noise control technology in schools. The cooperation between Tianjin University research team led by Shu Gequn, Weichai and Yuchai in the low noise control of diesel engines is obviously not so simple. . "Many research work of the award-winning project is carried out on the Yuchai model. It can be said that Tianjin University has carried out a large amount of basic research work, and Yuchai has undertaken the realization of engineering." On January 12, Yuchai Co., Ltd. Lin Tiejian, vice president of the institute, introduced the originality of the technical achievements of the project. He believes that the first is the torsional vibration damper plus frequency damper combined vibration reduction; the second is to use the exhaust gas recirculation to suppress the transient combustion noise of the diesel engine; the third is to combine the overall modal, mass and inertia distribution characteristics of the powertrain. The system and structure optimization design; the fourth is the calculation model of the insertion loss of the exhaust particulate filter of the internal combustion engine, which effectively reduces the transient combustion noise and structural vibration noise of the engine.
It is understood that the technical achievements of the project have been applied to four models such as Yuchai YC6L and YC4F. Lin Tiejian said that YC6L, YC4F and other series models are the main models sold in Yuchai market. At the same time, they have also derived 6J/6A/4FA and other platform models, all adopt similar noise reduction technology, and the sales volume is sufficient to illustrate the market recognition. degree. The winning project results are a set of innovative key technologies and methods that will continue to be applied in subsequent model development.
At the same time, Qiu Dehui, vice president of Weichai Power, also said in an interview on January 11th: "The research results have been applied in various series of models produced by Weichai." In the field of low noise control of diesel engines, Weichai has been keeping with Tianjin University. Work closely together.
Shu Gequn also told reporters that it is roughly estimated that in the past 10 years, diesel engines using this noise reduction technology have accounted for 50% of China's heavy-duty truck diesel engine output, 70% of heavy construction machinery diesel engine output and 55% of passenger car diesel engine market. .
Tianjin University helps domestic diesel engines to cross the European standard
"If the noise control does not reach the national standard, the diesel engine cannot be sold; if it does not meet international standards, it is impossible to export." Shu Gequn told reporters that the engine products equipped with this technology have been sold to the international market. It can be said that This technical achievement assists Chinese engine companies to cross 3 to 4 technical stages of European noise regulations in 10 years.
It is reported that the noise indicator is an important indicator of automobile and engine production licenses and export licenses. At present, China's motor vehicle noise limit is in line with the current EU regulations ECE R51/100. In 2005, China implemented new noise standards for automobiles, which has generated a strong driving force for low-noise technology applications in China's automobile and engine enterprises. To this end, Tianjin University has closely cooperated with domestic heavy and medium-sized diesel engine enterprises such as Weichai and Yuchai, and has carried out noise reduction and low noise design work for dozens of domestic diesel engine models. The industrial application of the results of this project is inseparable from the support of enterprises. As early as 1993, Yuchai established a joint technology development center with the State Key Laboratory of Combustion Engines at Tianjin University. Since 1994, Tianjin University has undertaken the research on the vibration and noise of Yuchai's introduction of the US 6112 diesel engine products, and has carried out the vibration and noise reduction work of several series of diesel engines.
At the same time, since 2000, Weichai has also established a joint laboratory of vibration and noise with the State Key Laboratory of Combustion Engines of Tianjin University, and carried out cooperative research on the whole machine noise reduction of a series of automotive and non-road diesel engines. Yan Dehui told reporters that in recent years, Weichai has been doing a good job in the combination of production, education and research, and has achieved relatively good results. The research team of Tianjin University, led by Professor Shu Gequn, has expertise in the field of low noise in diesel engines, and the two sides have maintained long-term close cooperation.
In May 2010, the State Key Laboratory of Combustion Engine Combustion of Tianjin University led the establishment of the first “Energy-saving and Environmentally Friendly Internal Combustion Engine Industry Technology Innovation Alliance†led by universities. The alliance included universities, research institutes, enterprises, Weichai, Yuchai is a participating unit, and vibration noise is one of the main directions of the alliance.
The noise reduction research work is not carried out in isolation, and the combined effects of various factors such as engine cost, weight, fuel consumption and emissions must be considered. Obtaining low noise levels of the engine under various constraints is a major difficulty for diesel companies in project development. Lin Tiejian said that relying on the basic research strength of Tianjin University and the engineering ability of Yuchai, efforts can always overcome the above difficulties.
Good technology still needs to fall on the product
The idea is good, and it must be implemented on the product. “Weichai and Yuchai have made important contributions to the industrial application of this technological achievement.†Shu Gequn told reporters: “This process is not what companies need to do, but universities and research institutes and companies must recognize Their own positioning and responsibility, and work together." In Shu Gequn's view, the combination of production, education and research is the synergy and integration of research, education and production of different social divisions in function and resource advantages, and is the technological innovation of the upper, middle and lower reaches. Docking and coupling. Industry-university-research cooperation is the only way to promote the scientific and technological progress of China's automobile industry and improve the ability of independent innovation.
It is true that the research and development of internal combustion engine products is very extensive. With the tightening of emission regulations, the requirements for research and application of new technologies are becoming higher and higher. Therefore, it is necessary for internal combustion engine enterprises to continuously strengthen school-enterprise cooperation and carry out research with relevant research institutions. Joint research and development to ensure a leading edge in cutting-edge technology. Leading companies in China's engine industry, such as Weichai and Yuchai, are actively promoting technological advancement in the industry. The cooperation between enterprises and the integration of production, education and research by major research institutes is expected to promote technological advancement of engines.
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