Now manufacturers produce fewer and fewer manual transmission models, and 4S shopkeepers sell all automatic transmission models. Speaking of automatic transmission models, in addition to Japanese cars Toyota, Honda and Nissan using CVT continuously variable transmission, including luxury brands, Volkswagen and other joint venture brands and domestic brands, the mainstream automatic transmission models now mainly use dual clutch and AT manual transmission.
Then the question is, when consumers buy a car, do they choose a dual-clutch gearbox or an AT manual gearbox?
Principle of double clutch and AT gearbox
To know how to choose a gearbox, we must first know the working principles of these two gearboxes.
The so-called dual-clutch gearbox is to add a clutch on the basis of manual gear, one clutch works and one clutch is standby. When the car needs to shift gears, the two clutches are automatically and quickly switched by computer control, which avoids the power interruption caused by stepping on the clutch when shifting gears manually.
The so-called AT gearbox generally refers to the manual-automatic 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 and experience the driving pleasure of manual gear shifting.
Characteristics of double clutch gearbox
In recent years, powershift has only been applied on a large scale. Especially under the leadership of Volkswagen, more and more automobile brands began 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 manufacturers is larger. Many manufacturers adopt dual clutch, mainly because 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, with direct gear shifting, low power loss and low fuel consumption, which can maximize the performance of the engine.
But the disadvantage is also obvious, that is, when driving at a low speed and encountering traffic jams, the car frequently shifts gears, which will cause a sense of frustration and affect the driving experience. In severe 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 defects of dry dual-clutch gearbox, engine oil is added to the gearbox to achieve the effect of cooling the gearbox, so that the gearbox will not overheat and lose power because of frequent gear shifting. This is the wet dual-clutch gearbox.
The wet dual clutch gearbox is a compromise solution. After adding oil to the gearbox, certain transmission efficiency is sacrificed and the reliability of the gearbox is improved. However, if the process is not up to standard, oil leakage and abnormal noise will occur in the gearbox.
Characteristics of AT automatic manual transmission
Compared with the dual-clutch gearbox, the AT manual-automatic gearbox has more complicated structure and higher cost. Most of the patents are in the hands of industry giants ZF and Aisin, and the procurement cost of manufacturers is higher.
AT present, the mainstream AT gearboxes on the market mainly include 6AT (6th gear), 8AT (8th gear) and 10AT (100 gear). The more gears, the more complicated the structure and the higher the cost.
At present, 6AT is widely used in ordinary family cars, such as Changan Yidong 1.6L, Volkswagen LaVida 1.5L, and Linke 03? 2.0L models, etc.
Generally, 8AT and 10AT are mainly used for higher-end luxury brands, such as BMW 3 Series and Volvo S60L. But now domestic high-end models have begun to use 8AT gearboxes, such as Geely Xingyue 2.0T model and Changan CS75PLUS? 2.0T models, etc.
The more gears there are in the automatic 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 in powershift, with high power consumption and relatively high fuel consumption.
How to choose dual clutch and AT gearbox?
Understand the characteristics of two gearboxes, and then combine your actual car demand, when buying a car, you will know which gearbox to choose.
If you buy an ordinary domestic and joint-venture brand family car, which is usually driven in urban areas, with many low-speed roads and frequent traffic jams, then you'd better avoid the dual-clutch gearbox model and choose the AT manual-automatic gearbox model, otherwise the probability of gearbox problems is greater. Believe it or not, blocking two cars is clear. The difference between AT and the same-level dual-clutch gearbox is one in the sky and one in the ground.
Ordinary family cars, if the road conditions are good and there are few traffic jams, then the dual-clutch model is not impossible to buy, but it is best to choose the wet dual-clutch model.
If you buy luxury brand cars or high-end models of domestic brands, you can directly choose 8AT or even 10AT models, and the comprehensive performance of its gearbox is the best at present.
Netizens, when you see this, what gearbox will you choose when you buy a car?
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.