Introduction | The last bottleneck is still the dragon?
On March 27, the 4th “Dragon Cup” World Top Ten Transmission Selection Ceremony held by the Auto Evaluation Institute was successfully completed, and the new top ten transmission was bled.
Like China Heart Top Ten Engine, the world’s top ten transmission selection of the Auto Evaluation Institute is also questioned. But no matter what to say, it is also the largest number of domestic influence. Just like Wushu’s university list, there is a place where it is sick, but people are in accordance with certain standards, still have a certain reference value.
From the selection result, there are 3 AT gearboxes, 3 DCT gearboxes, 3 mixed gearboxes and 1 CVT gearbox, independent brands Take 5 positions, just half of the mountains.
What are the current gearboxes in the international advanced level? What is the level of gearbox technology of independent brands? Let the car gather together to discuss it. 
First, three high-end AT gearboxes, three different solutions
CF 8at, Mercedes-Benz 9at, universal 10t, should be in the current civilian grade model High-end gearbox represented. These three are vertically gearboxes, which are only suitable for rear-drive arrangement, and the space occupied by the cab is even greater. The advantage is that the weight distribution is more uniform, which is more obvious for the increase in manipulation.
The disadvantage is that such gearboxes are basically destined to have only high-end models, the recommended models are also the 5 Series, AMG C43 coupe, and Cadillac CT6.
Let’s say that EF 8at, and its appearance can tell the military competition in the gearbox field to a new height. Before the appearance of EF 8AT, Mercedes-Benz 7at, love letter 6at, these gearboxes are already a leader in the industry, and it can be said that the high-end models and general home models are inexpensive. The emergence of EF 8at, especially the performance of the BMW series, allowing people to see the power of high-end transmission.
The first is the responseThe speed is fast enough, and the throttle will immediately respond speed, with the sound wave of the BMW engine, bring a good driving experience. It is also a good fortune, because more dense teeth are designed, its shift slip is much better than the previous generation model. Because of the design of multiple gear, its fuel consumption is also very good. Moreover, the transmission efficiency is also quite, up to 98%.
In addition to this, the bearer of the 8at of EF 8A is also amazing. The latest fourth-generation captory 8AT torque capacity can be achieved by 800n ∙ m, which allows it to match more models. In addition to the BMW, Audi’s high-end models, the Rover Range Rover SUV is also equipped. 
Many people say that Xif 8at is the most perfect gearbox, even more perfect than their own 9at and 10at. This is not a good review, but it should be the best gearbox that is currently made in the current market, basically doing good. The biggest shortcoming is estimated to have only a longitudinal version, so that it is better to believe 8at.
The earlier, the early 7at of Mercedes-Benz is actually a relatively leading gearbox, but compared with the EF 8AT, whether it is performance or economic, it is backward. Therefore, the Mercedes-Benz is “corner overtaking”. In order to capture the words of the gearbox, the Mercedes has launched a 9AT gearbox. It uses a gear structure that is completely different from the original 7AT gearbox. The transmission ratio is 9.15: 1, which makes it wider, and the fuel consumption at high speed cruise is lower.
It also adopted a very special design, 1 gear translation ratio reached 5.502, which allowed it to get very torque output in the startup stage, of course, the disadvantage is to sacrifice certain flatness. In the economy and comfort mode, it uses a 2 gear start, and the head block transmission ratio is 3.3. It is equivalent to become a 8AT gearbox ratio of a teeth, which is better than the believe in love.
Therefore, Mercedes-Benz 9at also has its own unique skills. At present, the overall evaluation is quite good, and the disadvantage is not for sale.
The 10at used by CT6 is launched after 9at.A high-end longitudinal gearbox, Cadillac’s high-end models are relatively small, so its wellness is a little bit a bit. However, overall evaluation is still good, although it is a 10-stop design, but it does not pursue a large tooth ratio like other manufacturers. Its speed ratio is “only 7.39, which is lower than the 8AT gearbox. But it is close to the teeth, so that the power can be fully played, and the smoothness is still very good. Of course, the disadvantage is that the fuel consumption can only be considered.
CT6 can go to 10 blocks at around 80km / h at the measured speed, regardless of strength to refute the high-speed shuttle of some car enterprises.
Overall, these three high-end gearboxes are equally characterized. Although CT6 proves that the higher gear is still useful, with the current electric development trend, many major manufacturers will not spend great effort to study higher-end gearboxes.
Second, self-primary brand proposal DCT, has become a common answer
There are three 7DCTs selected from this selection, which are the name of Mr. 6, Chang’an Uni-T and Red Flag. H9 gearbox. At present, the best manufacturers who have dual clutches in the international clutch should be the mass group. In the past, in order to avoid Toyota in the field of technology in the AT gearbox, the public began to invest in DCT development. There have been more problems, but they also have new solutions. In fact, it will find that the market will find that the market is currently in the DCT gearbox.
DCT is also the dual-clutch gearbox, and its core components are two clutches. We can simply understand that it is a clutch device to control an odd plug, another clutch device controls an even block. After the vehicle is hung into a gear, the corresponding clutch device meshes, and the other set of clutch devices are in the preparatory state according to the driving needs, so the power transmission speed of the DCT should be the fastest in the mainstream gearbox.
Since there is no liquid torque converter, its shift power loss is very small, and the transmission efficiency is higher than the AT transmission. Moreover, the design of the double clutch is very compact, the volume is also smaller than the traditional multi-block AT gearbox. Its shortcomings are also more obvious, that is, its lifting charm needs to first go to the engine.Send a signal and then determine which gear is cut by the control system. Because the control system does not always recognize driving needs, there will be a phenomenon that the meshing gear does not match the actual driving demand, and it is reflected in driving. One point is that the early DCT transmission is more, mainly the problem of durability. But now the self-owned brand is basically used by wet double clutch. Although some of the efficiency is sacrificed, it is still still possible.
In addition to the superior partial extractive alternate, in addition to the small part of the small-sized campaign in addition to the small partial extractive cage in addition to the small number of external cultivation, such as SAV, Chang’an, Hongqi. In addition to positioning H9 H9, Hard, Hard, which is taken, and the remaining models are almost all of their own DCT. Although Chery has certain accommodation in the CVT field, it is limited to CVT carrying capacity, most models are also used DCT gearboxes.
It can be said that no matter what you like, the DCT transmission should be the mainstream of the future. It is good to see from market feedback. In addition to low speed, this “Tongxia”, the autonomous brand gearbox is still a reputation of quality, at least no large scale problem.
Third, Wanliang CVT, independent brand of alone
Wanli Yang is “bother”, and later, Chery has adopted “technology into the stock” form. Help it opens the passenger car market, and the two have been cooperated to improve the technology accumulation in the CVT gearbox.
The principle of CVT is actually very simple, which is composed of two sets of cone, and then connects the steel strip (steel chain), and then passed through the steel strip in two sets of cone wheel Slide between slides to speed. Its advantage is that it is very smooth, although absolutely transmit efficiency does not come out, but its economic range is very wide, so it is actually very savvy, the disadvantage is that the bearing torque is limited, and can only slow down, accelerate the performance . 
Current CVT is better to be a few Japanese companies, the most representative is the JATCO holding Nissan Holdings. It is said that Tianzhu 2.0T steel chain CVT maximum tolerance can achieve 450N ∙ m, and It is also more water. The rest of Toyota, Honda’s CVT is also specialPoint, there is Other Honda improved the structure of the conical steel strip, allowing its CVT feedback sensitivity, Toyota added the starting gear in CVT, so that its low speed response is faster.
Overall, these three considered better, but there are a lot of problems, and it is 315 in Nissan. However, considering that almost all models of Nissan is equipped with CVT. The annual sales volume of light is millions, and the overall failure rate is not too exaggerated.
Wanli Yang’s list is that the Tiggo 8 Plus is CVT 25, which is excellent in the domestic gearbox. The maximum torque of this transmission can be affected is 250N ∙ m. Its flow controller’s vane pump is very high, and the overall fuel consumption is better, and the evaluation in quality is also good. Four, three mixed gearboxes are not the future direction?
This selection has three mixed gear elections, which are DQ400E, Toyota E-CVT, and 6DCT for BYD Tang DM, respectively.
First, Toyota’s E-CVT gearbox, as a starter, Toyota’s THS is very classic, and its e -Cvt gearbox is the absolute core of this system. It coupling the engine, generator, and motors, mainly to a “peak-filled” role, with the motor output to make up for the engine performance and insufficient performance. That is, the engine operation output is mainly used, while the motor is intervened to help the engine complete efficiency is not high, the generator is homogeneous and the energy storage and discharge, and E-CVT decides when to use electricity, when will I use oil.
This system is very classic, and it is also from the most basic design of the engine to make up the traditional internal combustion engine. However, due to Toyota super industry design capabilities and patent traps, competitors are difficult to imitate. So now the new generation of hybrid systems have not taken this path, with Honda I-MMD’s mixing system, plus the current BYD DM-I and the Great Wall DHT, is the main route. .
is the masterThe electric drive is driven, and the engine is “power” in the economic section. The “savage oil” is realized by multi-purpose, it is simpler, which is more simple, better than the power of the THS system, but the fuel consumption is quite. So Toyota’s system is, becoming “Dragon Slayer”, one is playing, it is estimated that it is difficult to become a future mixed development direction.
The Voyue GTE and Tang DM are another route, and their main advantages are to achieve energy saving, environmental protection, and no pure tram type. . Their main competitors are not actually the Japanese HEV model, but through the strength of the green brand, offset the cost disadvantages after the power battery and the motor.
Taking the Voyue GTE as an example, although it is still equipped with the EA211 1.4T engine, but the integrated output power of its hybrid system can reach 155KW after the motor, the maximum torque output can be achieved by 400N ∙ m. The dynamic performance is comparable to the 2.0T model, but it saves more oil. Tang DM is more “excess”, it can be completely output with the maximum horsepower, and the motor is completely output, and the speed of 4.3 seconds of 0-100km / h accelerates.
But whether it is the exploration of GTE or Tang DM, because the performance of “feed” is not stronger than the fuel car in the same level, the positioning is relatively embarrassing. Because people with charging conditions, they don’t see their shorter pure electroicolines, and prefer to buy pure electric vehicles. Without charging conditions but the people who are deficient will consider them. But the result is that when the fuel car is open, the driving experience is not good.
From the results, the PHEV models such as exploring Yue GTE and Tang DM have always been a state in which it is not hot. Therefore, the Volkswagen did not regard the model of the GTE route as the mainstream of the new energy route, and started the main arch. Series such pure tram type.
After BYD tangled, it has recently been promoted to the “charging treasure” mixed model similar to Qin Plus DM-I.
Therefore, although the award, these two systems, I am afraid it is not the mass and BYD’s technology route. 
Car gathering
Overall, the high-end AT gearbox field has basically abandoned. Mercedes-Benz, BMW, these international car companies, technology development has also reached a certain bottleneck, at least I haven’t heard who is developing a 11AT gearbox, but a higher gear may have no great significance, more focus on the prior art .
The DCT field is the focus of self-owned brands, but the technology of technology is almost. Who can accumulate more data, do better in transmission efficiency and reliability, will be the best relief. The CVT field is still the mainstream of the Japanese, but the technical breakthroughs of the Wan Yang are worth encouraging.
Mixing technology may be the focus of the future development, but Toyota THS is mainly based on engine, and the motor is a secondary way is currently “tall and widow”. There is no other car enterprise to play, and Toyota direct technology transfer has no several connections. Volkswagen GTE and BYD DM route, with the current mainstream market expectation deviations, in future competition, may be defeated in system technology like BYD DM-I.
Lastly, which gearbox is your most optimistic?