At present, there are two voices on the dual-clutch transmission, one is that the dual-clutch transmission is an advanced transmission form, which represents the future, and its transmission efficiency is high and the speed of shifting is fast, and sooner or later it will replace the AT and CVT gearboxes; the other voice believes that the double-clutch transmission has a high failure rate, a strong low-speed setback, low-speed setbacks, low research and development and manufacturing costs, and it is difficult to compare with the AT gearbox. So what is the truth of the facts?
In fact, these two sounds have some correct places, but they are biased, dual-clutch transmission after so many years of development, has become and AT, CVT side by side with the automatic transmission three musketeers, enough to see that it has a certain usability. Next, we will analyze the characteristics of each of the three gearboxes in detail.
DCT transmission: The most efficient transmission
Advantages: direct transmission, high transmission efficiency, fast gear change speed, strong driving pleasure
Disadvantages: poor low speed and smoothness, poor quality stability, low maximum torque
Are all dual-clutch transmissions frustrated? Or do all dual-clutch transmissions shift gears fast? The answer is no. A lot of dual-clutch transmissions you simply can't open the difference between AT and AT, and the typical Great Wall dual-clutch transmission, the shift speed is slower than many AT, but we want to talk about the general characteristics of the dual-clutch transmission.
The so-called advanced dual-clutch transmission is actually an upgraded version of the manual transmission, which controls two sets of gears through two input shafts, and realizes the shift operation by joining and disconnecting, and its structure is much simpler than that of the AT gearbox.
Because the two sets of shift mechanisms are on standby at any time, the DSG gearbox shifts relatively faster, but this also brings problems, and many times the control program is difficult to understand the owner's intentions, so the setback will occur. Since there is no torque converter, the double clutch is connected by the hardness of the gear, so the wear of the clutch will be more serious.
At present, the tuning of the dual-clutch transmission is very important, but also the key to determining the dual-clutch transmission experience, with the continuous accumulation of the manufacturer's tuning experience, the dual-clutch transmission on the market is gradually mature, and the current experience of the dual-clutch transmission on the market is PDK's dual-clutch, Volkswagen's DSG, hyundai's dual-clutch, Lynk & Co's dual-clutch, etc.
CVT transmission: The smoothest gearbox
Advantages: smooth shifting, simple structure, small volume, low cost
Disadvantages: Lack of driving pleasure, low withstand torque
Again, not all CVT gearboxes are smooth, but smooth is the first impression of many people on the CVT gearbox, CVT gearbox because it is a stepless transmission, through the diameter of the two tapered discs to change the speed, through the steel belt to transmit power, so there is no sense of passage of shifting, in general, driving is relatively smooth, in addition to the characteristics of the stepless speed change also makes the vehicle can always be in the high efficiency range.
But at the same time, the structure of CVT is simple, the maximum torque can be borne is low, and the best CVT gearbox on the market is also difficult to withstand more than 500 Nm of torque, so high-performance cars are doomed to be out of the CVT.
AT gearbox: the most balanced gearbox
Advantages: smooth shifting, taking into account a certain driving pleasure, mature and stable, can withstand the torque
Disadvantages: low transmission efficiency, complex structure, the greatest difficulty in research and development, and the highest cost
If you don't know how to choose, choose the AT gearbox is right, it is by far the most reliable and stable transmission form, the core of the automatic transmission is the hydraulic torque converter, by transmitting torque to achieve soft connection. The advantage of the AT gearbox is that it can achieve smooth shifting and have a certain driving pleasure, can withstand large torque, but the same transmission efficiency is low, and the complex structure makes it difficult to develop the AT gearbox, and the research and development cost is high, so there are not many companies in the world that can develop and produce AT gearboxes.
Therefore, compared with AT and CVT gearboxes, the dual clutch is more efficient in transmission, fast shifting speed, and driving pleasure, but also has some shortcomings in smoothness. How to choose depends on the car environment, if the urban congestion road conditions, AT and CVT gearbox is a better choice, if the suburban highway section is more, DSG gearbox will be more suitable for you.