November 25, 2014, North China Ice City Harbin. A series of CRH5A EMUs began to enter the final stage of the “5000 km positive line testâ€.
For China CNR Changke Co., this day is unusual. Because the traction electric drive system and network control system loaded by this train are pure Chinese, they are also the first in China.
After seven years of exploration, China's first generation of high-speed rail people developed China's first "high-speed rail heart" and "high-speed rail brain." In the visible devices, Chinese design, Chinese manufacturing and Chinese materials are realized; in the invisible control software, Chinese language, Chinese logic and Chinese thinking are rushing.
"The heart of the high-speed rail" and the "high-speed rail brain" will achieve 100% localization, which will greatly enhance the core creative capability of China's high-speed trains and consolidate the strength of China's high-speed rail. "Li Junru, deputy chief engineer of Changke Co., Ltd. said.
The most critical core technology for high-speed trains
"The traction electric drive system is the heart of the high-speed rail. It is the heart of the people. It is the source of power for the train. It determines whether the high-speed train can run high-performance and comfortably. The network control system is the brain of the high-speed rail. Every move of the train."
On December 9, Li Jun, deputy chief engineer of China North Car Changke Co., Ltd. in Changchun, explained the doubts for the reporter.
The train network control system is equivalent to the "brain" and the "neural center" to the human body in the rail transit equipment. It controls and monitors various devices on the vehicle, and undertakes the transmission and processing of all control information and fault information of the train. , storage and display functions, is one of the most critical core technologies for rail passenger cars, and is also the focus of technical blockade of foreign companies.
Today, China's high-speed railways have reached more than 10,000 kilometers, and hundreds of thousands of passengers travel every day on comfortable and fast high-speed rail.
However, the passengers did not know what caused the train to accelerate to a speed of 250 km per hour in the shortest time, ensuring maximum comfort for the passengers. Zheng Hengliang, the company's network control technology expert, and Teng Wanxiu, deputy director of the basic research and development department, explained: "There is a best critical point between the highest acceleration and the most comfortable ride. This critical point depends on the 'high-speed rail heart' and the 'high-speed rail brain' in real time. Intelligent capture and exploration of an optimal program to maintain a steady state of the train from zero to high speed."
The important role of "the heart of the high-speed rail" and "the brain of the high-speed rail" is countless. Therefore, whether the independent research and development of these two core technologies can be achieved is a fundamental indicator to determine whether the high-speed train manufacturing enterprises have core creative capabilities. .
"After 10 years ago, the application of China's EMU autonomous train network control system is still in a blank state. Today, in this field, we have reached the international advanced level!" When it comes to this, Li Jun's face is full of confidence.
A "conference war" that challenges the peak of technology
In 2004, CNR Changke Co., Ltd. cooperated with Alstom of France to introduce a CRH5 high-speed EMU with a speed of 200 km per hour. At that time, Chang Zhenchen just graduated from the Ph.D. and worked in the postdoctoral mobile station of Changke Co., Ltd., and was assigned to be responsible for the digestion and absorption of the train network control system of the EMU.
"At the beginning of the cooperation, because the foreign party has reservations in technology transfer, we can only explore it in front of artificial technical barriers." Chang Zhenchen made an analogy: "It is like a superb video game, as Users, we only think that the program is especially good, but I don't know how the program is compiled. The software developers don't tell you."
There is only one way in front of the eyes: aiming at the international advanced technology level, on the basis of technology introduction, to achieve digestion and absorption and innovation.
This is a "conference war" that challenges the peak of technology.
In order to break through the core technology of high-speed EMUs and increase the intensity of independent innovation, the former Ministry of Railways has established a major project of “EMUs Key Technology Independent Innovation Deepening Research Projectâ€. The CRH5 EMU traction electric drive system and network control system are independent innovations. Part of the project.
At the beginning of 2007, on the basis of digestion and absorption, the new chapter of China's train network control system was independently opened in Changke Co., Ltd.
Just as Chang Zhenchen led the team to realize the localization of the CRH5 EMU train network control system, the CRH5 model, which was put into operation on April 18, 2007, has experienced frequent jumps in the shaft temperature of the shaft temperature display system.
Zheng Hengliang, a company network control expert who participated in research and development, recalled: "Every time there is a jump, it is necessary to stop and manually detect the shaft temperature. The short is 5 points, 8 points, and the long time is more than 20 minutes, which seriously affects the normal operation order of the vehicle. Feedback to the foreign company, the defendant has to solve the problem for at least half a year, and a large fee."
It is simply unbelievable to solve the problem of the rapid development of China's high-speed rail. After several trade-offs, with the technical accumulation in the independent research and development process for several years, Chang Zhenchen decided to rate the team to attack itself.
The road to attack is difficult and tortuous.
The program of the train network control system is extremely complicated. If one instruction is wrong, it will affect the entire computer to read the data. Finding such a problem in the tens of thousands of lines of source code is like finding a needle in a haystack! "To correct the technical defects of the foreign side, it is more difficult than writing the program yourself!" Recalling those days with great pressure, Zheng Hengliang is still unforgettable.
The mountain is a peak. After many rounds of car inspections and repeated simultaneous tests on the ground test bench, the team finally accurately smashed the culprit in the complicated process and found the time parameter for making trouble. Through software redesign, the problem of shaft temperature false alarm caused by CRH5 axle temperature jump is completely solved.
A glimpse of the whole leopard. The autonomous improvement of the shaft temperature display system is only a microcosm. "Under the efforts of the team, the overall failure rate of the CRH5 EMU has been greatly reduced through repeated hard work, which not only ensures the smooth operation of the online CRH5 EMU, but also enables the company to obtain subsequent market orders for similar models. The customer also reflected very well." Kong Feng, deputy director of the railway passenger car development department of Changke Co., Ltd. said.
Future R&D focus is on Industrial Ethernet on high-speed trains
On October 22, 2014, the fully autonomous CNR CRH5 EMU train network control system (“High Speed ​​Rail Brainâ€) was approved by the China Railway Corporation for technical review and was approved for mass loading, becoming the first approved batch in China. EMU train network control system for loading and running.
Subsequently, the CRH5A EMU loaded with China CNR's autonomous traction system and network control system was launched in the Harbin Railway Bureau.
Since 2007, the CRH5 EMU has been operating safely and stably for 7 years in China. A total of 141 columns (including 1 comprehensive inspection vehicle) have been put into operation, covering 18 provinces including Northeast, Northwest, Central Plains, South China and East China. It can withstand the test of the temperature difference between minus 40 ° C and zero and 40 ° C. The total operating mileage has exceeded 200 million kilometers, equivalent to more than 5,000 circles around the earth.
In the past ten years, through the introduction, digestion and re-innovation, China CNR Changke Co., Ltd. has focused on the overall, forward-looking and strategic perspectives, making full use of national policies and applying for the construction of high-speed train system integration national engineering laboratory and national railway passenger car system. The Integrated Engineering Technology Research Center has improved the construction of technical innovation institutions for railway passenger cars, and integrated resources such as R&D team, R&D tools, and R&D platforms to comprehensively improve R&D capabilities and R&D.
With the support of relevant state departments, CNR Changke Co., Ltd. also invested 139 million yuan to establish a “High-speed Train System Integration National Engineering Laboratory (North)†covering an area of ​​15128 m2, focusing on simulation analysis and product testing. Tasks, through simulation analysis, test bench test and other means to analyze, calculate and test new technologies, new materials and new processes, new products, verify its feasibility and reliability.
While building a cutting-edge innovation platform, China CNR has also established an excellent team of innovative talents. "At present, the company has more than 1,500 product development and engineering teams, with a complete line of rail bus system integration, car body, bogie, network control and other professional and echelon team innovation and R & D team." Li Jun said.
Innovation never ends.
China CNR Changke Co., Ltd. has focused its research and development on industrial Ethernet on high-speed trains. Industrial Ethernet's transmission speed can reach 1000 megabytes, which is 1000 times faster than the current train network transmission speed, which will greatly improve the transmission speed of the entire vehicle information, and some image information can also be transmitted through Ethernet.
Chang Zhenchen told reporters that this technology is just getting started in foreign countries. China CNR Changke Co., Ltd. will work hard to make China occupy this new technology highland as soon as possible.
Two Bowls Handmade Kitchen Sink
Two Bowls Handmade Kitchen Sink,Small Double Sink Kitchen,Double Sink Kitchen,Double Bowl Sink
Zhongshanshi JiaBaoLu Kitchen And Bathroom Products Co., Ltd , https://www.gabalusink.com