Automatic transmission 100 schools contend for lack of autonomy
What kind of automatic transmission does China need, and the future development trend of transmission technology, what new challenges will electric vehicles bring to the transmission industry of traditional internal combustion vehicles? At the "Power Technology Roundtable Forum" on July 11, these topics became the focus of discussion among the participants.
CVT is more suitable for Chinese urban roads?
China is the market with the largest number of auto brands in the world. In the field of automatic transmissions, it has also become a testing ground for various technical routes such as AT, CVT, and DCT. However, we still hold our own opinions on what kind of automatic transmission is more suitable for the automotive market in China.
Fu Yuwu, chairman of the China Association of Automotive Engineers, believes that what kind of automatic transmission to choose should be an important measure. "By 2020, China's auto companies face the biggest problem is whether they can achieve a fuel consumption index of 5 liters per kilometer. For this reason, we must think about how automatic transmissions can play an important role in energy saving and emission reduction and reducing fuel consumption." Fu Yuwu said Regardless of whether the vehicle is equipped with AT, AMT, or DCT, CVT, its contribution to vehicle energy conservation should be comprehensively considered.
Tsinghua University Suzhou Automobile Research Institute of Powertrain Institute of Technology by Yi Yi believes that from an industrial base point of view, DCT is developed on the basis of MT, in terms of independent brand companies, the future may be a good select.
As an adherent of CVT technology, Nissan Motor Drive Systems Development Minister Yamamoto Kiyosaki stated that it is the widespread use of CVT that has significantly improved the fuel economy of Nissan models and effectively reduced the carbon emissions of Nissan vehicles. "The CVT is more suitable for urban conditions where the speed of the vehicle changes." Yamamoto Kiyosuan stated that Nissan had fitted AT, CVT, and even DCT on models in the past and even now, but the company believes that CVT has advantages in reducing carbon dioxide and fuel consumption.
Bosch is also a strong supporter of CVT promotion. Zhang Hui, Chief Business Officer of Bosch (China) Investment Co., Ltd., stated that Bosch expects that the CVT in the Chinese market will reach nearly 2 million units by 2014 and 4.3 million units by 2020, with an average annual growth rate of 20%. Global sales of CVTs in 2013 are nearly 8 million units. In 2014, they are expected to reach 10 million units. By 2020, they will reach 14.7 million units, with an average annual growth rate of about 9%. "At present, there is one CVT for every five automatic transmissions in the global market. By 2020, about one out of every four CVTs will be CVTs." Zhang Hui said.
Experts call for self-care industry <br> <br> automatic transmission automatic transmission currently China's auto market, perhaps the most urgent needs of not selecting the best technical route, but how can we have autonomy, powerful automatic transmission industry, no longer Depends on outside supply. According to the latest statistics from world-renowned information company IHS, in 2013 China’s passenger car market, the installed capacity of the automatic transmissions of the joint venture’s models has reached 70%, and the automatic transmission installed rate of self-owned brand vehicle companies has also reached 17%, and this 17% The vast majority are outsourced automatic transmissions.
Looking back at the development course of the domestic autonomous transmission industry, we will find that although China began research and development of automatic transmission more than a decade ago, many companies have invested a lot in this field, but they have achieved very little and have achieved industrialization so far. Even more are few. Wang Shengtang, former secretary general of China Gear Professional Association, said: "In the past few years, we have introduced transmissions from seven or eight multinational corporations. These transmission products all have the shadow of others and are mostly unsuccessful." "At present, there is only Hunan Rongda CVT. Shengrui 8AT's “Good Miaozi†in the field of several automatic transmissions, but their marketization is advancing very hard, and domestic auto companies mostly adopt a wait-and-see attitude.If they cannot successfully achieve industrialization, China’s automatic transmission industry may well "Failure." Wang Shengtang urged that domestic vehicle companies can take care of and support the healthy development of the domestic autonomous transmission industry from the height of industrial development. "Whole vehicle companies must give a certain degree of market tolerance to our own innovative products. We must help more to identify problems and improve problems, instead of rejecting them, and just want to eat ready meals," he said.
Transmission of electric cars become the new hot spot <br> <br> addition to traditional automatic transmission, electric vehicles on the traditional automatic transmission industry challenges and opportunities, but also the hot topic of the meeting the parties concerned. Xu Xiangyang, vice president of the School of Transportation Science and Engineering at Beijing University of Aeronautics and Astronautics, believes that multi-speed gear is an inevitable trend in the development of electric vehicles. Equipped with an automatic transmission with a 2nd or 3rd speed in an electric vehicle can not only make better use of the characteristics of the motor. To reduce the motor's torque demand will help reduce the size and weight of the motor, reduce costs, and more importantly, the mileage will increase by 8% to 10%. "Electric vehicle start-up acceleration performance is very good, but when the speed is about 100 kilometers in the middle high-speed segment and then accelerate, the response speed is very slow, if you match the 2 or 3 speed transmission, you can greatly improve the electric vehicle in the high-speed stage Accelerating performance." Xu Xiangyang said. Yamamoto Kiyohide also believes that the popularization of electric vehicles in the future is a general trend, and electric vehicles equipped with multi-speed automatic transmissions are the future technological trends. "Whatever type of transmission is, the core of future development is low-carbon, high-efficiency, and low-cost. This multi-technology line competes with each other, and the trend of development in the competition is undoubtedly determined." Xu Xiangyang believes that electric vehicles The development of one step requires a multi-speed automatic transmission. For an electric passenger car, the most cost-effective one is a two-speed automatic transmission.
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