What is powershift?

It is based on manual transmission instead of automatic transmission, which can provide uninterrupted power output besides the flexibility of manual transmission and the comfort of automatic transmission. However, the traditional manual transmission uses a clutch. When shifting gears, the driver must step on the clutch pedal to make the gears of different gears mesh, and the power is interrupted when shifting gears, which makes the output performance intermittent.

What's the difference between automatic manual and dual clutch?

Advantages of automatic manual transmission: it can save some driving pleasure while driving easily. Disadvantages: poor fuel economy. Suitable for the crowd: the typical car owners who mainly use cars in urban areas and are hard to give up driving pleasure: Beijing Hyundai NF Yuxiang, mazda 6 and other ordinary automatic transmissions are developed from traditional automatic transmissions. These gearboxes have obvious+/-signs, and drivers can shift gears manually in this position. However, the manual mode of ordinary automatic manual transmission can not be compared with the manual transmission in response speed. There are two kinds of programming: manual and automatic. One focuses on engine protection. When the engine speed is too low or too high, the transmission will be forced to move up and down. The manual-automatic gearbox, which pays attention to driving pleasure, provides more display space for car owners. Even if the engine speed is too high, the gearbox will not make a good claim, and the dual clutch limits the engine speed by cutting off the oil supply. Advantages: quick gear shifting and good fuel economy. Disadvantages: There are few application models, and the accessories are expensive and suitable for people. Owners' representatives who have high requirements on gearbox shifting time and power transmission efficiency: Volkswagen Golf GTi and Audi TT Volkswagen's DSG dual-clutch gearbox is a new gearbox with subversive design, which not only inherits the characteristics of high transmission efficiency of manual gearbox, but also shifts faster than manual gearbox. Through the staggered transmission of two sets of power transmission routes, it can reach the level that all automatic gearboxes can't reach. Porsche, which is closely related to Volkswagen, will also use this technology in high-performance sports cars, and Volkswagen will gradually start to use DSG in low-end models.

Difference between dual clutch gearbox and manual-automatic gearbox

There is no doubt that the dual clutch gearbox is good.

Reason:

Power shift DCT is different from ordinary automatic transmission system. It is a manual gear instead of an automatic gear. In addition to the flexibility of manual transmission and the comfort of automatic transmission, it can also provide uninterrupted power output. However, the traditional manual transmission uses a clutch. When shifting gears, the driver must step on the clutch pedal to make the gears of different gears mesh, and the power is interrupted when shifting gears, which makes the output performance intermittent.

It should be said that the design concept of powershift is very good, which solves the contradiction between MT and at, that is, it has both the performance of MT and the convenience of AT.

The requirements for automatic gearbox (DCT can be regarded as a kind of automatic gearbox) are nothing more than smoothness, acceleration and fuel consumption.

Not to mention ride comfort, DCT and CVT are definitely better than ordinary AT and MT.

Acceleration is also the advantage of DCT. It used to be thought that MT must have an advantage over at, but DCT can shift gears in 0.2 seconds, which any excellent driver can't do. Many high-performance sports cars: GTI R36 EVO X BMW M3 Nissan GT-R adopts powershift.

Fuel consumption has always been a controversial point, and everyone feels that it is not as fuel-efficient as imagined in the import public forum. It seems to be the same as CVT. Although it will be more fuel-efficient than at in theory, it is actually related to many factors. MT will be more fuel-efficient if it drives normally every day.

But DCT is not perfect, first of all, it is a well-known temperature problem. Some time ago, Volkswagen recalled the Magotan imported from DSG, saying that there was a problem with the temperature sensor, which might make the gearbox jump into neutral protection while driving. However, some people have analyzed that it is not that there is a problem with the sensor, but because DSG is based on MT, and it is in a semi-linkage state in urban areas for a long time, which is easy to cause excessive temperature.

The new DSG is a dry 7-speed. Compared with the original 6-speed wet type, it has smaller volume and higher efficiency, but lower high temperature resistance and torque resistance, and is only suitable for small cars.

Therefore, the performance advantage: DCT & gtMT & gtAT & gt continuous variable transmission.

Comfort: CVT & gtDCT & gtAT & gt machine translation

Economy: MT & gtCVT & gtDCT & gtAT (personally, CVT is more fuel-efficient than DSG in theory)

Driving pleasure: MT & gtDCT & gtAT & gt continuous variable transmission

Maintenance: MT & gtat & gtCVT & gtDCT (although Nissan's CVT is maintenance-free, personally, its reliability is still lower than that of ordinary AT).

What's the difference between CVT and dual clutch?

Automobile CVT is a hydraulic coupler, that is, in a closed container, one blade drives the hydraulic oil in the coupler to rotate with the engine, so that the other blade rotates with it. In the process of power transmission, there is no rigid connection to transmit power.

The full name of double clutch is dry double-disc clutch with friction plate, which belongs to rigid connection. Dry friction clutches are divided into single-disc clutches and double-disc clutches according to the torque output by power transmission. Small cars are single-plate clutches, and large cars, especially large trucks, choose double-plate clutches. A dry clutch with one friction plate is a single-plate clutch, and a clutch with two friction plates is a double-plate clutch.

In order to make the engine, clutch and gearbox more compact and save space, whether it is four-wheel drive or two-wheel drive, the output shaft of the engine is actually the crankshaft itself, but a flywheel is installed at the end of the crankshaft. The clutch assembly is installed on the flywheel, and the pressure plate or intermediate pressure plate of the double-plate clutch rotates with the flywheel, which is a rigid connection, so it can be called the clutch driving plate.

The static part of the clutch is the clutch friction plate. Clutch friction plate is riveted by steel plate, spline groove sleeve and leling plate. The spline sleeve of the clutch friction plate is rigidly connected with the spline shaft of the input shaft of the gearbox to transmit power to the gearbox.

How is the driving plate and static friction plate of clutch connected? Then talk about the installation sequence of clutch assembly on the plane, so as to better understand it. Before installing the clutch pressure plate, first stick the clutch friction plate on the flywheel, and then install the pressure plate, so that under the action of the clutch spring, the clutch pressure plate will press the static friction plate on the flywheel, and when the flywheel rotates, the friction plate will also rotate together to transmit power to the gearbox. Because the flywheel is a smooth metal plane; The friction plate is a smooth non-metallic plane; The pressure plate is a smooth metal plane, which is connected by the force of spring and belongs to flexible connection, which is beneficial to clutch combination and stable power transmission.

Through the above comparison, what is the difference between CVT and dual clutch?

1, CVT belongs to the flexible connection form of hydraulic transmission, with advantages: easy operation and no damage to parts; Disadvantages: low mechanical efficiency.

2. Double-disc clutch belongs to the form of mechanical power transmission, and rigid connection transmits power. Advantages: high mechanical efficiency; Disadvantages: inconvenient operation, frequent adjustment and maintenance.

I hope I can help you.

What is a dual clutch?

Double clutch corresponds to ordinary clutch. German Volkswagen has been committed to researching more efficient and environmentally friendly technical concepts and producing Volkswagen DSG dual-clutch gearboxes.

The domestic working principle is as follows!

Clutch 1 responsible 1 gear, 3rd gear, 5th gear and reverse gear, and clutch 2 is responsible for 2nd gear, 4th gear and 6th gear; In odd gears, the clutch 1 is engaged, the input shaft 1 works, the clutch 2 is disengaged, and the input shaft 2 does not work, that is, there are always two gears engaged during the operation of the DSG transmission, one is working and the other is preparing for the next step; In manual mode, you can skip and downshift: if the starting gear and the last gear are controlled by the same clutch, the gear controlled by another clutch will be changed; If the starting gear and the last gear are not under the control of the same clutch, you can directly skip and downshift to the specified gear.

However, in my opinion, the dual clutch gearbox is not as good as the CVT continuously variable gearbox. Although the dual-clutch gearbox also solves the frustration of shifting and the fluency of acceleration, the cost of this dual-clutch is too high, the structure is too complicated, and the weight is also the largest, which greatly increases the maintenance cost of a car. This is not as good as CVT, but CVT also has defects. Due to the design structure, the torque of CVT gearbox should not be too high. If it exceeds the maximum limit of 300N.m, it is very likely that the steel strip will be damaged or slide to the chasing plate and the steel strip, resulting in insufficient power and other reasons.

The basic types of gearbox are MT AT MAT CVT DSG, each with its own advantages! ! !