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Recently, at the monthly forum on the “Clean Power Development Roadmapâ€, Yu Zhuoping, Dean of the School of Automotive Engineering at Tongji University, believes that the diesel system of the power system is the most effective way to achieve energy-saving and emission reduction for automobiles in terms of the environmental issues facing the automotive industry in China. . From the perspective of the fastest and most mature technology for energy conservation and emission reduction, diesel engines are better than gasoline engines. Although gasoline engine technology is continuously optimized, it has not yet reached the maturity level of diesel engines in use. At present, the diesel engine market is very mature.
Improve fuel efficiency
The biggest feature of diesel engines is low fuel consumption and low emissions. Compared with traditional gasoline engines, they can reduce fuel consumption by about 30% and reduce carbon dioxide emissions by about 25%. It is understood that from 1999 to 2004, Germany promoted the promotion of diesel technology, which saved 90 million tons of fuel and reduced 15 million cubic meters of carbon dioxide emissions. From the fuel's point of view, about 90 million tons of fuel is saved, which is equivalent to the amount of oil used for 100,000 cars for a year. Since the launch of common rail technology in the late 1990s, the proportion of diesel cars on the European market in new cars has exceeded 55%.
Yu Zhuoping said that China's diesel engine market has also matured. For example, he said that last year, Shanghai Volkswagen, with the support of the Ministry of Science and Technology, did a diesel taxi demonstration project. A total of 50 diesel taxis participated in the event. They used different oils - Euro II, Euro III diesel, Synthetic oil and so on. The excellent operation of 220,000 kilometers proves that China's oil technology can fully meet the needs of diesel engines.
In the world, Europe has been pushing diesel engines, Yu Zhuoping said that although Japan has developed very well in the past ten years, but in fact, diesel technology may be even more important than hybrid technology. Hybrid technology can only be applied to urban road conditions, and diesel technology is very universal in both urban and suburban areas. Therefore, from this point of view, China should pay more attention to the issue of dieselization and listen more to the promotion of diesel engines. Dieselization is an effective way to rapidly realize the energy conservation and emission reduction of transportation energy in China in the short term.
Compared with gasoline, diesel engines are more powerful and their torque is about 50% higher than that of gasoline engines. In the driving process, especially speeding acceleration driving, its performance will be greatly improved. In addition, conventional diesel engines can use synthetic fuels directly without modifying the engine.
Yu Zhuoping said that in the future development of the automotive industry, diesel engines directly reduce emissions, fuel consumption, and operating costs, which are beneficial to both countries and auto users. At the same time, with the continuous advancement of diesel engine technology, diesel engines have become a major development trend. Imperative.
DCT dual clutch automatic transmission
Mainstreaming development
Each country has its own different national conditions, and it is no exception in the choice of cars. For example, in Germany, a popular culture among car users is called driving pleasure, so there are many more manual vehicles in Germany than in automatic vehicles; but In the United States, almost all are automatic cars; according to the Chinese people's habits, there will be many users of automatic cars in the future. The number of automatic vehicles in China may increase from the current 20% to 30% to more than 50%.
On the other hand, the question now is what line will the traditional system take? It is understood that at present, a large number of automatic transmissions in China are taking the AT (automatic transmission system) road, but the automatic transmission car is more fuel-efficient than the manual transmission car. Yu Zhuoping believes that the continuous expansion of the automatic transmission car market is inevitable, but the AT fuel-efficient car is not encouraged.
Automatic transmissions have different systems such as AT, AMT, CVT, DCT, etc. However, AMT is subject to certain limitations due to shift quality. CVTs can be used on smaller power cars because of their belt rotation problems, but they can be applied to large vehicles because it is difficult to transmit more power due to friction and slippage problems. However, the DCT, which is a dual-clutch automatic transmission, is not the same. It is even more fuel-efficient than a manual transmission because the shifting process can be well controlled, which means that the shift is of higher quality and the two clutches can Well coordinated, there will be no power interruption, which is what AMT can't do. Yu Zhuoping thinks that from this point of view, the advantages of the drive system in energy saving and emission reduction are obvious. Now the German public is doing it, and China SAIC is also doing it.
Yu Zhuoping also said that if the automatic transmission technology can be deployed in the country, it will also be very helpful for hybrid power. If hybrid power cannot be combined with traditional systems, the development of hybrid power will be greatly limited.
April 09, 2021