The hottest howoa7 realizes the dream of automatic

Howo-a7 realize the dream of automatic transmission of China's heavy truck

howo-a7 realize the dream of automatic transmission of China's heavy truck

China Construction machinery information

Guide: at the end of 2008, Zhang Xiaoyu, executive vice president of China Machinery Industry Federation, once said that although China's automotive industry has made great progress and the international competitiveness of products has been continuously improved, there is still a big gap between some core technologies and foreign countries. Automatic transmission is one of them. Because it has not been implemented yet

rapid development of green manufacturing industry

at the end of 2008, Zhang Xiaoyu, executive vice president of China Machinery Industry Federation, said that although China's automotive industry has made great progress and the international competitiveness of products has been continuously improved, there is still a big gap between some core technologies and foreign countries. Automatic transmission is one of them. As the real industrialization has not yet been realized, it is under the control of others

not long ago, China Heavy Duty Truck launched the first heavy truck model howo-a7 with standard configuration of AMT (electronic controlled mechanical automatic transmission), and said that in the future, once the consequences of leakage will be unbearable, it is assumed that AMT models will be mainly promoted. Before that, AMT of FAW Group has also been successfully developed. In addition, AMT of many domestic heavy-duty transmission enterprises has also been on the road for a long time, but they are all stuck on the threshold of industrialization. The listing of the first AMT truck seems to mean that the domestic heavy truck has made a new breakthrough in the research and development of automatic transmission

choice: AMT is the development trend

according to Liu Wei, director of the technology development center of China National Heavy Duty Truck Group, the research and development of AMT by China National Heavy Duty Truck Group was not a whim, nor was it launched in a hurry, but after careful consideration. As early as 2005, heavy truck technicians who often visited Europe found that 20% to 30% of European road tractors used automatic transmissions (most of which were AMT), and this proportion was still on the rise. Heavy truck people realize that as people have higher and higher requirements for driving comfort, automatic transmission has occupied a considerable proportion in cars. In trucks, automatic transmission will also be the development trend of its transmission system. Europe has been reflected, and China will soon become the focus of development. Whoever first mastered the technology of truck automatic transmission will win the market opportunity. However, at that time, heavy truck had not produced its own transmission, so it was inconvenient to cooperate in the research and development of AMT, so it did not officially operate the AMT project

at the beginning of 2006, heavy truck and Weichai officially separated, and heavy truck had to produce key assemblies by itself. In addition to the engine, the transmission base also began to be built. After having its own transmission R & D and production base, it is possible for sinotruk to independently develop AMT, which can well control AMT projects. In particular, the national III engine with electronically controlled high-pressure common rail system and electronically controlled EGR system has been successfully developed and sold in batches, which has accumulated a technical foundation for the research and development of AMT with the same electronically controlled technology. Therefore, at the end of 2006, heavy truck officially launched the AMT project

in fact, besides AMT, there are at (hydraulic automatic transmission), CVT (continuously variable transmission) and DCT (double clutch automatic transmission) and other forms of automatic transmission. Why did heavy truck choose AMT? Liu Wei explained: "In Europe, the automatic transmissions used by trucks are basically AMT, with only a small number of at provided by ZF and Allison. From a technical point of view alone, the structure of at is relatively complex and the cost is high; CVT is limited by the transmission torque, and it is difficult to be applied to trucks according to the current technology; from the perspective of technical principle, DCT has no problem in trucks, but this is a latest technology, and there is no precedent for trucks to adopt DCT in the world; and AMT does not Only the structure is simple and the cost is low. More importantly, the original domestic production equipment and technology of manual transmission can be retained and used. " Therefore, on the whole, AMT is the most reasonable choice for the technical route of automatic transmission of trucks in China. Judging from the current research and development of domestic truck and heavy-duty transmission enterprises, AMT is the inevitable choice

R & D: stones from other mountains can be used to attack jade

amt (automatic mechanical transmission) is the abbreviation of electronic controlled mechanical automatic transmission system. Generally speaking, on the basis of ordinary manual transmission, add a set of electronic control system (TCU) with strong price in the national billet market on the 1st day, and use computers to replace people to shift gears. The principle of AMT is relatively simple, but the research and development process is not easy. It is understood that many domestic enterprises that develop AMT have tried for many years and have not yet formed industrialization. There are two obstacles that are difficult to overcome, one is the development of electronic control system, and the other is vehicle matching. Because AMT's control software needs to write all possible road conditions, it needs to constantly simulate all kinds of road conditions in the process of research and development. To cope with these hundreds of tests, oneortwo test vehicles will definitely not work, so a large number of test vehicles to match must be guaranteed

Ni Guixiang, head of the Ministry of corporate culture construction of China National Heavy Duty Truck, said, "with the successful acceptance of the project, China National Heavy duty truck has taken a path of independent innovation by introducing, digesting, absorbing and re innovating."

original innovation requires long-term accumulation. If sinotruk does so, it may miss the market opportunity. Therefore, "heavy truck research and development AMT, choose to stand on the shoulders of giants, and jointly develop with foreign design companies." Liu Wei said, "it is joint development, and heavy truck has completely independent intellectual property rights, rather than simply technology introduction." Foreign partners provide the TCU platform for heavy truck, and the technicians of heavy truck modify and improve the program according to the road conditions and operating environment in China

although cooperating with foreign design companies, the process of heavy truck research and development AMT is still very difficult. Li Fayou, director of the Transmission Design Institute of the heavy truck technology center, who is in charge of the AMT project, has much whiter hair than two years ago. He said that the foreign side only sent twoorthree engineers to guide the whole research and development process, and most of the design work was completed by more than 10 technicians of heavy truck. Over the past two years, they have volunteered to work overtime, search for information, simulate various road conditions, and constantly test and improve

Liu Wei pointed out: "the process of joint development with foreign companies is actually a process of learning from each other." The so-called mutual learning means that not only the technicians of heavy truck learn technology from their foreign counterparts, but also the foreign partners learn some test conditions from heavy truck that they have not considered before. For example, China's trucks are overloaded seriously. When calibrating the whole vehicle, it can't be done according to the approved total quality, but more than many, or even more than twice; In addition, the reliability of domestic heavy trucks is not as good as that of European heavy trucks. When driving under some poor road conditions, there may be flameout, brake failure, etc., which is the key consideration for AMT and vehicle matching, but in Europe, this is not the focus of technical research. "For foreign design companies, cooperating with heavy truck to develop AMT can enrich their database of electronic control software, which is of great benefit to them in developing markets similar to China." Liu Wei said