Dual clutch gearbox is a gearbox with unique advantages and disadvantages. Its advantages are fast shifting and low fuel consumption. Its shortcomings are limited by the principle of double clutch. Although the probability of heating card machine is greatly reduced after optimization, it is inevitable. In addition, in terms of service life, the friction plates of powershift are buffered in a semi-clutch state.
There will be wear and tear after a long time. As far as the development of automobile industry is concerned, if you don't have your own patented technology and intellectual property rights, as long as you want to develop your own automobile technology, it will be difficult to avoid the patents that others have already used. European and American countries have a strong awareness of intellectual property protection.
For example, if your gearbox has patented technology they applied for, the other party will find you in trouble. The final result is either to pay the patent fee to the other party or to wait for the trial. For this, when Haval H8 was suspected of reversing the chassis technology of a certain model of Mercedes-Benz, the lawsuit filed was enough for Great Wall Haval to have a deep understanding.
The cost of the dual clutch is greatly reduced because there are complex transmission mechanisms, including hydraulic torque converter and planetary gears. The principle of hydraulic torque converter and planetary gear is simple, but it is difficult to reach the level of Aisin or even modern Powerwater. Not only need to invest more R&D funds, but also may miss the favorable competition period of this model. No one knows what will happen in a few years. For domestic car companies with insufficient technical reserves, the risk and input cost are slightly higher, and the income is likely to be unsatisfactory.
Double clutch is different, because the structure and principle are very simple, and we can learn from the experience of manual transmission. The investment and cost of research and development are much lower, and the probability of mass production is higher, so everyone is aiming at double clutch. As early as 200 1, Borgwarner has successfully developed a dual-clutch gearbox and applied it to Volkswagen.
The famous Volkswagen DSG gearbox was developed by Borg Warner. With the promotion of national departments and the participation of domestic brands, powershift has rapidly landed in various brands, and China automobile industry has achieved leap-forward development through powershift.
Compared with German brands and German brands, there is still a big gap, but at least in this way, we don't have to rely on others. Domestic cars take the low-cost route, not that domestic cars are not good, but that we need to take the low-cost route, so that our competitiveness will be more obvious, but the price cannot be low because of the cost.
One of the costs is the three main parts of the car, which is the largest part of the car cost. If the gearbox is used by the supplier, it will be stuck, which is not good for cost control, especially if the car is smooth, the domestic car market will no longer explode, and the profits of car dealers must be improved, especially for individual cars.
The use cost of gearbox is too high, and the quality and durability of AT gearbox are better, but the production cost is high and difficult, and the fuel consumption control is not as good as the other two models (but there are more and more gears, and the gap with the other two models is getting smaller and smaller). The advantages of CVT gearbox are good ride comfort and good quality, but the disadvantages are that it can't bear large torque and is easy to slip.
Powershift has the fastest rotation speed and can perfectly release engine power. At the same time, its fuel consumption is relatively low, and its production cost is the lowest among the three. The disadvantage is that its quality is unstable. Finally, when it comes to powershift, many car companies will choose powershift because of its low technical difficulty and low production cost.
This has also led to the increasing use of dual-clutch gearboxes in domestic cars. There may be doubts, Volkswagen is useless, can domestic cars do it? In fact, domestic manufacturers deliberately changed the shift time of dual clutch when matching, which lengthened the shift time. The advantages of fast gear shifting and power are sacrificed, and even the backlash and overheating problems at low speed are well controlled. Generally, domestic brands use dual clutch, which is a last resort and also to save costs.