The lower the speed, the lower the fuel consumption, high-speed cruise, who is the most high-speed transmission than the minimum fuel-efficient. One of the most important performance of the gearbox is to speed up performance. Among the many factors that affect the acceleration performance, shift speed, tooth ratio arrangement and power loss are more restrictive to the performance of a variable speed system in accelerating performance. February 13, GM announced in China into the 9AT transmission, one after another in 13 models, the first model is Chevrolet's deliberation. This 9AT transmission by Ford and Ford jointly developed, it will also appear in the Ford models. With the involvement of GM and Ford, high-end car transmission line of the dispute has become more complex, showing a "three hegemony" situation. Carrying the "double clutch" banner is dominated by the public German cars; choose CVT mostly Honda, Toyota and Nissan Japanese cars. Select the wider AT, in addition to GM and Ford, AT also received Mercedes-Benz, BMW, Toyota, Honda's support. Of course, the car OEM will not all choose a certain transmission, will be a variety of parallel, can only say that some focus. High-end car, election 9AT, 7 block double clutch, or CVT? For the start to upgrade the election of high-end car in terms of Chinese consumers, is indeed a problem. This time for you to test three transmissions to see which is more suitable for you. Test method: the most equitable test method is the same car with an engine, respectively, with AT, CVT and double clutch, but the actual life did not. In order to avoid errors, the reporter as much as possible on the market equipped with these three models of the transmission, take a few more to open a car. Test its acceleration, ride comfort, fuel economy, ease of use and reliability, through the comparison of these five links to find the characteristics of different transmissions. Measured: CVT economical and practical 9AT and 7 block double clutch for high-end 1st round: Acceleration performance Double clutch wins Competition acceleration, naturally heavy foot throttle in the end. Accelerate the effect of immediate, the so-called "push back" the most obvious, to bring the driver the most refreshing. The sequencing of the acceleration performance is from high to low: 7-speed dual-clutch, 9AT transmission and CVT. Heavy speed acceleration, CVT is still easy to slip. Compared to the previous 6AT, 9AT shift faster, but the traditional efficiency of slightly lower congenital disadvantage or let it "hate". As the name suggests, the double clutch transmission is two clutches, you can imagine the two manual transmission function into one, built in a single system. Double clutch can solve the shortcomings of manual transmission shift speed slower, but with manual transmission of traditional high efficiency advantages. Not only the public "God car party", even ordinary consumers are recognized "double clutch to accelerate the fastest" argument. The public can go to China in the altar, "TSI + DSG" strategy meritorious service, which, DSG is a dual-clutch transmission. After the public, GM, Ford, Hyundai have launched a dual-clutch transmission models, can be said to adapt to the market, can also be considered a compromise. 2nd round: ride comfort CVT bestOn the ride comfort, no doubt, CVT ranked first, 9AT second, 7 block double clutch third. Come to this conclusion is not complicated, that is, feel the size of the impact of shift. Shift impact force is small, smooth smooth smooth, ride the natural comfortable; shift shock, the passengers will feel the vehicle "a red rushed", motion sickness is usually so produced. Double clutch and AT are also trying to improve comfort, increase the gear is the most effective means, both in recent years to open the number of gears on the reasons for the arms race is also here. However, even if the increase in gears is difficult to offset the inherent advantages of CVT. CVT CVT internal gear and no gear, but to change the diameter of the two transmission wheel, the middle of the drive belt to drive. CVT system in the acceleration of the acceleration has never fluctuated, is undoubtedly the most comfortable system. Ride comfort, the closest to the CVT is undoubtedly 9AT, the reporter driving 9AT, there is the illusion of driving CVT models. Audi A8L is used 8AT transmission, not 7-speed dual-clutch, the purpose is to further enhance the comfort. Round 3: fuel economy CVT winDriving fuel-efficient principle is: the lower the speed, the lower the fuel consumption. In the transmission efficiency, the double clutch is the highest, only the internal gear friction loss of energy. While the automatic variable speed is the most efficient, the torque converter loss of energy. As for the CVT, the structure is only the friction of the shaft and a short time the chain slip, energy loss is very small. CVT advantage is to always maintain the appropriate speed, the engine speed will not be high, it will not be too low, "just enough" drive the vehicle. 9AT and 7 block between the double clutch, no doubt 9AT more advantages. The more gear, the more dense teeth, fuel consumption is also the lowest. Ride comfort is good, fuel economy is high, but CVT also has its fatal drawback is unable to withstand high torque. Short time, suddenly came when the big torque CVT easy to slip. This is not difficult to understand, each brand flagship models, hardcore SUV are not used CVT. CVT shortcomings is the advantage of automatic transmission, can withstand high torque, but also can withstand the challenges posed by harsh use of the environment. Round 4: the use of three very convenient These three clutches are fool-style, no manual shift. Automatic parking at the beginning is still relatively rare, and now also began to popularize. Slope start, just put the brake on the throttle, do not worry about the car after the slip. Occasional encounter answering the phone (do not recommend doing so), over the toll station fees, etc., and will not rush. The shift paddle is a stylish configuration that appears after the steering wheel. For ordinary people, the shift paddle is of no use. The beginning will feel fresh, easy to forget a long time. These three transmission gear block in addition to the traditional style, there are also key and muffler type. The most in line with driving habits, or the traditional block to the type, easy to use, and can reduce the misuse rate. 5th round: reliability 9AT, double clutch are recalled9AT recalled in the country, also recalled in the United States. Land Rover Range Rover Aurora to solve the hidden trouble at the same time, the warranty period will be raised to 7 years or 240,000 km. Similarly, the public double-clutch also recalled, the scale than Land Rover Range Rover aurora also more big. Recall, not terrible. Reporters have test drive four times 9AT models. The first time in the United States, the model is Jeep free light. At that time, 9AT is the focus of the audience. Jeep proudly claims that Freedom is the world's first equipped with 9AT passenger cars. Experience the feeling is not good, 9 block is really less than. The second test drive 9AT is in the country, the models into Land Rover Range Rover Aurora, 9AT for Land Rover Range Rover Aurora fuel economy improvement is obvious. The third is the Mercedes-Benz GLC, 9AT in the fuel economy, comfort, quiet on the advantages began to reveal. The last time is the crown, the crown on the 9AT can be said to achieve perfection, accelerate the powerful, high-speed cruise fuel-efficient. ZF did not work for the 9AT rectification work done by Honda. In order to compare, the reporter also specifically test drive again after the Jeep free light, the middle and behind the output was significantly strengthened, apparently for the Chinese road conditions have been re-adjusted. 9AT control program has also been upgraded, high-speed cruise can also climb to 7/8/9 block. 【Conclusion】 From the test results is not difficult to see. CVT most suitable for home, ride comfort is good, fuel economy is high, but also provide a slightly higher than the 4AT sense of science and technology. CVT replaced with 4AT, the past two years the car OEMs are doing this, Toyota Vios will be so dry. But in the large car, CVT due to the limited torque, will be marginalized, AT and double clutch will be more mainstream. AT and double clutch between an arms war, especially the number of gears on the game, now it seems, AT has the upper hand. 9AT has been approved by a number of automotive OEMs, 6AT has become the most reliable reliability, the best durability of the form of automotive gearbox. More critical, after 9AT, 10AT and 11AT are already under development. Dual-clutch can also keep up with the pace, but the public has been announced in 2015 to give up 10-block dual-clutch research and development. This means that the maximum number of gears for the dual clutch gearbox is at "8". Today, the public is one of the few insist on the use of dual-clutch car OEMs. General, modern, Fiat is intended to start from the next generation of models, with AT replace the current double clutch. Local enterprises, Guangzhou Automobile Chuanqi, BYD also has a similar plan. Guangzhou Automobile Research Institute executive vice president Wu Jian said that with the use of new materials and new technologies, AT's traditional efficiency will be further improved. In the high-end field, through a reasonable layout and innovative design, 9AT transmission capacity has been comparable with the 6AT. At the same time, after mass production, the cost of the 9AT gearbox will be controlled. Reporter observedCan not afford to buy 9AT, can buy 6AT!9AT can be used to "install" face, but there are also for the 9AT gearbox 120km / h difficult to hang the ninth block of the question, however, general technical staff said that the new 9AT transmission of this new 9AT transmission efficiency is not low, 13% to 52%, is definitely not furnishings. According to the introduction, GM 9AT gearbox with coaxial design, all gears are arranged in the same straight line with the crankshaft, gear sets, clutch and hydraulic torque converter selection to follow a specific strategy to provide accurate, smooth Shift experience, "aside technology, so much of the main engine factory for the 9AT endorsement, the basic can be concluded, AT transmission is more representative of the development trend of the transmission." South China University of Technology Institute of Automotive long-term automotive powertrain research in the Soviet Union Teacher said in an interview. 9AT fuel economy how? Data from the general show that compared with the 6-speed automatic transmission, 9AT fuel economy increased by 2%, while supporting automatic start and stop start and stop technology. In China, more than a gear, more than "dignity." This may be some exaggeration, but the Chinese consumers in the transmission gear on the aesthetic really "to more for the United States." Traveling by car or chatting in the parking lot, often ask the number of gears in the transmission. Zoom into the whole market, China will be the world's largest high-end car market, high-end car market competition, 9AT is clearly more convincing. However, from the actual use of speaking, 9AT on most of the engine and most consumers are overcapacity. Buy equipped with 9AT transmission models, spending may not increase 10,000 to 20,000 yuan, is likely to be 10 million to 15 million, because 9AT are in high-end models. In China, high-end car side never lack of buyers, 9AT as a symbol of high-end cars, will gradually become a standard. Buy Tesla Model S consumers are aware of the electric car in the charging and mileage on the short board, but still headlong. In fact, 9AT is also. Users are not 9AT itself, but fancy "9" block this number, and with the "9" from the high pressure grid. Moreover, the 9AT reliability problem is only temporary, to solve, than the electric car to solve the mileage problem is much easier. 9AT is one of the effective means to improve customer satisfaction, others with you than the car, than the process, than the configuration, than with the material, you told him than the number of gears. Really can not afford 9AT models do not matter, 8AT and 6AT is enough to use. Automotive technology iteration and change, are from top to bottom. 9AT promotion, the 6AT will be universal, 6AT 20 years ago, but also only in the luxury car on the high-end configuration.