At present, many people on the Internet talk about double clutch, that is, discoloration, but everything has advantages and disadvantages, many people only talk about the failure rate and setbacks of double clutch, but they do not talk about the advantages of double clutch. In fact, many car companies, including Volkswagen, choose dual clutch for a reason.
Advantages and disadvantages of dual-clutch transmissions
1. High transmission efficiency
The dual-clutch transmission is the one that is closest to the manual transmission in terms of transmission efficiency, and there is no one. Compared with the transmission efficiency of the AT transmission of about 80%, the transmission efficiency of the Volkswagen dry double clutch can reach more than 90%. Transmission efficiency means fuel economy for consumers and easier meeting emission standards for manufacturers.
2. Fast gear shifting speed
In terms of shift efficiency, because the dual-clutch transmission has two input axes, one gear is combined, and the next gear is ready to be combined, so the shift speed is very fast, and some people prefer the action of the dual-clutch transmission to shift gears, as well as its more sporty shift performance.
3. The difficulty of research and development is low
More and more independent brands use or even independently develop dual-clutch transmissions, but the car companies that can independently develop AT gearboxes on the market and can be used in their own mass production vehicles can count on one hand, which fully illustrates the difficulty of research and development of AT gearboxes. 90% of car companies rely on purchasing AT transmissions from companies like Aisin and ZF, which is why AISIN and ZF have such a big influence.
4. Simple structure and low production cost
Compared with the AT gearbox, the structure of the dual-clutch gearbox is much simpler and rougher, the AT gearbox is generally composed of hydraulic torque converter, planetary gear mechanism, shift actuator, shift control system, shift control mechanism and other devices, while the dual-clutch transmission through the mutual alternating work of the two sets of clutches to achieve shifting, simple structure means lower production costs.
5. Poor low speed and smoothness
Compared with other types of transmissions, dual-clutch transmissions produce ups and downs at low speeds, mainly because the two clutches think about life when combined, especially when the brakes are refueled.
6. The failure rate is high
Compared with the mature and stable Aisin 6AT gearbox, the failure rate of the dual clutch is slightly higher, but it also depends on the specific brand, the failure rate of the double clutch and the double clutch of the Fiat Group that is discarded by the general is unbearable, and the double clutch failure rate of the public is much better, but the failure rate is also based on the probability.
Why do companies such as Volkswagen use dual-clutch transmissions?
After talking about the advantages and disadvantages of double clutch, we are talking about why Volkswagen and other car companies have to use dual-clutch transmissions, many people say that Volkswagen sees the prospect of high efficiency of dual-clutch transmission, but I think Volkswagen may not have such a long vision, when the emission standards were far less stringent than they are now. Mainly because of the Aisin card neck, so forced to develop their own gearbox, and AT because of the patent barrier, dual-clutch transmission is the easiest area to break through, so will choose to develop dual-clutch transmission, and now crooked, just to meet the trend of emissions.
As for many independent car companies, there are reasons for using dual-clutch transmissions, some for fuel saving and emission standards, some to reduce costs, and some to bypass patent barriers.