Even though the streets and alleys are full of cars now, many people still have little knowledge about the configuration of cars, such as the gearbox, one of the three most important parts of cars, and many people still don't understand it.
AT present, manufacturers produce fewer and fewer manual transmission models, and 4S shopkeepers sell all automatic transmission models. When it comes to automatic transmission models, apart from Japanese cars Toyota, Honda and Nissan using CVT continuously variable gearboxes, including luxury brands, Volkswagen and other joint venture brands and domestic brands, the mainstream automatic transmission models now mainly use dual-clutch and AT automatic manual transmission.
then the question is, when consumers buy a car, do they choose a dual-clutch gearbox or an AT manual transmission?
the principle of dual clutch and AT gearbox
to know how to choose a gearbox, you must first know the working principles of these two gearboxes.
The so-called dual-clutch gearbox is based on the manual gear, in which one clutch is added, one clutch works and the other clutch is on standby. When the car needs to shift gears, the two clutches are automatically and quickly switched through computer control, thus avoiding the power interruption caused by stepping on the clutch when shifting gears in manual gear.
the so-called AT gearbox generally refers to an automatic manual gearbox, which combines manual gear shifting with computer automatic gear shifting, and the hydraulic torque converter is controlled by computer to achieve the purpose of automatic gear shifting. Drivers can also switch to manual mode to experience the driving pleasure of manual gear shifting.
characteristics of dual-clutch gearbox
powershift has only started large-scale application in recent years, especially under the leadership of Volkswagen, more and more automobile brands have started to apply dual-clutch gearboxes in batches.
compared with AT gearbox, the dual clutch gearbox has a simpler structure, so the cost is lower and the profit margin of the manufacturer is larger. Many manufacturers adopt dual clutch, the main reason is that they take a fancy to the low cost of dual clutch.
the original dual-clutch gearbox is generally in the form of dry dual-clutch, which has the advantages of direct shifting, less power loss and lower fuel consumption, and can maximize the performance of the engine.
However, the disadvantage is obvious, that is, when driving at a low speed, in case of traffic jam, the car will change gears frequently, which will cause frustration and affect the driving experience. In serious cases, the clutch may overheat and the gearbox may malfunction. These problems have occurred in dual-clutch gearboxes carried by joint venture brands such as Volkswagen and Ford.
in order to improve the defect of dry dual-clutch gearbox, oil is added to the gearbox, which has achieved the effect of cooling the gearbox, so that the gearbox will not be overheated and lose power due to frequent gear shifting, which is the wet dual-clutch gearbox.
The wet dual clutch gearbox is a compromise scheme. After adding oil into the gearbox, certain transmission efficiency is sacrificed and the reliability of the gearbox is improved. However, if the process is not up to standard, there will be oil leakage and abnormal noise in the gearbox.
characteristics of AT automatic manual transmission
compared with dual-clutch transmission, at automatic manual transmission has more complicated structure and higher cost, and most of the patents are in the hands of industry giants such as ZF and Aisin, so the procurement cost of manufacturers is higher.
the mainstream AT gearboxes on the market now mainly include 6at (6th gear), 8at (8th gear) and 1at (1th gear). The more gears, the more complicated the structure and the higher the cost.
At present, there are many ordinary household models, such as Changan Yidong 1.6L model, Volkswagen LaVida 1.5L model and Lexus 3? 2.L models, etc.
generally, 8AT and 1AT are mainly used in higher-end luxury brands, such as BMW 3 Series and Volvo S6L. However, now domestic high-end models have also begun to use 8AT gearboxes, such as Geely Xingyue 2.T model and Changan CS75PLUS? 2.T models, etc.
The more gears there are in AT manual transmission, the higher the shift efficiency, the smoother the shift and the better the reliability. However, the shift efficiency of 6AT transmission used in ordinary family cars in the market is generally not as good as that of dual-clutch transmission, with higher power consumption and relatively higher fuel consumption.
how to choose dual clutch and AT gearbox?
I know the characteristics of the two gearboxes, and when I buy a car, I know which gearbox to choose.
if you buy an ordinary domestic and joint-venture brand family car, you usually drive it in the city, and there are many low-speed road conditions, so you often encounter traffic jams, so you'd better avoid the dual-clutch gearbox model and choose the AT manual-automatic gearbox model, otherwise there is a greater probability of gearbox problems. Believe it or not, blocking the second car is clear, and the difference between AT and dual clutch gearbox at the same level, one in the sky and one underground.
for ordinary family cars, if the road conditions are good and there are few traffic jams, it is not impossible to buy a dual-clutch model, but it is best to choose a wet dual-clutch model.
if you buy a luxury brand car or a high-end domestic brand car, you can just choose the 8AT or even 1AT car directly, and the overall performance of its gearbox is the best at present.
netizens, seeing this, what gearbox would you choose to buy a car?
This article comes from the author of Chejia, car home, and does not represent car home's standpoint.