"Do you know who invented the high pressure common rail system?" Someone raised this question at a conference held recently.
The time to enter 2015, from January 1 this year, the State III diesel vehicles will not be sold, the diesel car market into the real sense of the National IV era. Regardless of the post-processing route, the use of a high pressure common rail system is an important means of achieving State IV. This is well known, but it is not easy to fully answer the questions mentioned at the beginning of the article.
On December 29, 2014, as a leading company in the domestic high-pressure common rail industry, Li Shaoan, deputy general manager of Liaoning Xinfeng Group Co., Ltd., reviewed the development history of the high pressure common rail system and analyzed the current market conditions.
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Both generations of high pressure common rail technology originate from ETH
“High-pressure common rail system is a new generation of diesel fuel injection system that began to develop in the 1990s. Because of its obvious technical advantages, it quickly replaced in-line pumps and electronically controlled monomer pumps, electronically controlled VE distribution pumps, and Cummins Accumulator. The conventional electronic fuel injection system for diesel engines, such as the injection system CAPS, has become the mainstream technology route for diesel fuel systems, said Li Shao'an.
Common rail high-pressure technology from the Swiss Federal Institute of Technology Zurich (referred to as ETH). In the 1960s, Professor Robert Huber of the college successfully developed a prototype of an electronically controlled common rail system for diesel engines. In 1983, Marco Ganser received a Ph.D. in Engineering from ETH on the topic of "Electronically Controlled Accumulator Injection System for Passenger Car Diesel Engines: theoretical and experiments". This is the world's first generation of high pressure common rail technology research paper.
After completing the research and development of the first-generation common rail technology, ETH continued to conduct in-depth research and released the second-generation high-pressure common-rail technology in 2001. The second-generation common-rail technology uses a central pressure-accumulation principle on the injector to avoid high-pressure fuel leakage caused by the pressure difference between the two ends of the needle valve and the uneven injection volume caused by the slender high-pressure oil hole throttling. The 1 micron particle trapped the fuel injector causing malfunction and other unfavorable factors, more suitable for China's fuel conditions. In addition, the second-generation technology uses forced lubrication on the high-pressure pump, making the initial design pressure of the second-generation high-pressure common rail system reach 1800 bar.
Europe, the United States and Japan actively develop high pressure common rail products
Based on the results of the first generation of high pressure common rail technology based on ETH, Fuji Electric, Fuji Sawa, etc., of Japan Denki Co., Ltd. developed the ECU-U2 common rail system in 1995 and used it in the J08C diesel engine of the Hino Rising Ranger heavy truck. In 1990, Magneti Marelli of Italy's CentroRicerche Fiat and Elasis also developed the high pressure common rail technology used in cars and sold it to German Bosch for mass production. In 1997, Bosch's first-generation high pressure common rail products were used in the Fiat Alfa Romeo 156 2.4JTD diesel engine and the Mercedes-Benz C220 diesel CDI engine, and soon replaced the traditional fuel system such as the electronically controlled VE distribution pump, becoming the world's diesel engine. The mainstream is known as one of the three major breakthroughs in the internal combustion engine technology of the 20th century.
Since the highest pressure of the first-generation high-pressure common-rail products was 1350 bar, Bosch improved its maximum pressure to 1,450bar after it was improved. It is targeted at light and medium-duty diesel engines and is called Bosch's second-generation common-rail product. It was introduced to China in 2004. “At present, Bosch is promoting the second-generation common rail product upgrade in China IV stage. The maximum pressure is 1600bar, and the CB18 and CB08 high-pressure pumps developed and produced by Wuxi Weifu Group are imported to localize the high pressure common rail products. In addition, Bosch's common-rail high-pressure pump for heavy-duty diesel engines, CPN2, was acquired by ZEXEL in Japan and was introduced to China in 2004." Li Shao'an introduced.
In addition to Bosch, Delphi Corporation of the United States inherited the compact injector design structure published by CAV Corporation of the United Kingdom in 1998 at the SAE Annual Meeting, and launched common rail products for light-duty diesel engines; Siemens first introduced piezoelectricity in the world. Common-rail injectors have very few examples of applications in Europe and the United States, such as Ford's 1.8-liter diesel engine produced in Brazil. As for Denso Japan, in 1999, the maximum pressure of its second-generation common-rail product ECD-U2P system increased to 1600 bar. In 2003, Denso launched HP3 and HP4 high pressure pumps for medium and light diesel engines, with the maximum pressure increased to 1800 bar. In addition, Cummins Inc. of the US is also developing and manufacturing heavy-duty diesel common rail high-pressure common rail systems similar to Bosch.
New style introduces second-generation high pressure common rail technology
ETH's second-generation high-pressure common-rail technology has attracted the attention of the German Liebherr Group. It established the CRT company's process research and adaptability improvement for mass production of the second-generation high-pressure common-rail technology, and sold it to China and Japan in 2005. technology.
In 2006, Liaoning Xinfeng Enterprise Group spent 5 million euros to purchase the Liebherr Group's high pressure common rail technology license, which laid the foundation for its technological superiority.
"As a result, the new wind is developed on the second generation of high pressure common rail technology in the world and has a solid technological advancement." Li Shaoan told reporters: "The new generation of high pressure common rail products with the advantages of the second generation of high pressure common rail technology, It has won the favor of the Great Wall, Yunnei, Lai Dong and other diesel engine manufacturing enterprises, and Foton, GAC Gio, ZTE, Panther, Kama and other automobile manufacturers.At the end of 2014, Futian, GAC Gio, and ZTE equipped with a new common rail system The light trucks, micro-cards and pickup trucks of brands such as Panthers, Black Leopard and Kama have been listed in succession to meet the national IV emission standards to be fully implemented by the state. Xinfeng Group has successfully introduced and digested high-pressure common-rail products in terms of development and industrialization. The company has formed a powerful R&D team and product platform and has developed independent research and development skills such as 3D simulation analysis, hydraulic simulation, CAE design, test analysis, etc. The high pressure common rail that meets the national VI emission standards On the product, New Breeze is cooperating with international companies and research institutes to develop high-pressure common rail products with 2200-2500bar, and gradually achieve annual production of 2 million sets. The capacity of the high pressure common rail system and its research and development capabilities."
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