referred to as the DCT dual-clutch gearbox, the English called Dual Clutch Transmission, because it has two clutch, it is called ldquo; dual clutch transmission rdquo ;.
origin
origin dual-clutch gearbox from motor racing, it is the first practical application in after Porsche Porsche 962C in the early 1980s and 1985, Audi car Audi sport quattro S1 RC, but because of the durability, etc. after more than ten years of improvement, really it has been applied by ordinary production car. Today DSG technology has 20 years of history, the technology is already very mature.
Technical description
combines the advantages of dual-clutch gearbox manual transmission and automatic transmission, a torque converter is not used, instead using two sets of clutch, by two alternating work the clutch, without a gap to reach a shift effect. The two clutch gears and the even control the odd gears, that is, before the shift specifically, the DSG has been previously engaged gear to the next gear after the shift to give instructions, the DSG issues a command to the engine quickly, the engine speed increases, At this time, the gear previously engaged bound rapidly, while the first set of clutch completely open, complete a upshift operation, and so the latter operation.
Since there is no torque converter, the power of the engine can be fully realized, while two clutch work alternately, such that the shift time is very short, the power of the engine fault will be very limited. As the driver of our most immediate impression is that the switching action is extremely rapid and smooth gear, power transmission almost without interruption, the dynamic performance of the vehicle can be fully realized. Compared with the conventional automatic transmission using a torque converter, since the DSG shift more direct, less power loss, so that fuel consumption can be reduced 10% or more.
inadequacies
However, with a conventional automatic transmission compared, the DSG has some inherent disadvantages, firstly that since no torque converter, A manual transmission can not achieve ldquo; semi-linkage rdquo; operation, so for small displacement engine, inadequate torque characteristics at low speed will be completely exposed; Second, since the DSG transmission employs a computer-controlled , belonging to an intelligent transmission, it needs to send an electronic signal to the engine during the lifting / lowering gear in the reply by the engine, and the engine to complete with l / downshift. A large number of electronic components, which also increases the chance of failure.
At present there is a common dual-clutch Volkswagen DSG, Ford’s Powershift, Mitsubishi and Porsche’s PDK such as SST.
DSG
DSG (Direct Shift Gearbox) Chinese surface meaning ldquo; direct shift transmission rdquo;, DSG dual clutch technology for the public just buy their own proprietary title only.
origin
DSG on origin such as high-tech, like other cars, the design comes from motorsport, and its practical application in the early 1980s Porsche Porsche 962C and the 1985 Audi car Audi sport quattro S1 RC, and who helped them win a number of titles ~! The concept of dual clutch is very advanced, but as new technology there is a problem of poor durability, durability is good or bad also determines the amount of its costs, so that after more than ten years of development, it really is common Street car use.
works
1: FIG, 1 is responsible for a speed clutch, third speed, fifth speed and reverse clutch 2 is responsible for the second speed, fourth speed, and sixth speed; hang when odd-numbered gear clutch 1 in combination, the work input shaft 1, two separate clutches, the input shaft 2 does not work, i.e., there are always two transmission gear during operation of the DSG bits are bonded, a working, the other for the next step to prepare; manual mode downshift can jump: If the initial gear and the final gear belong to the same clutch control will further clutch by the gear shift control that, if the initial gear and the final gear does not belong to the sameClutch control, it is possible to jump directly reduced to a predetermined gear position.
AMT’s structure is more efficient automatic transmission, while the DSG has a flexible and comfortable in addition to a manual transmission and automatic transmission, it’s better to provide uninterrupted power output, which is totally different from the two automatic clutch control. DSG substantially composed by several major items: 6-speed mechanical gearbox two substantially three axes, a hydraulic clutch mechanism contains two electron Duoban clutch plate, a gearbox ECU. Unlike ordinary biaxially gearbox, the input shaft or a single system, in addition to the DSG double clutch gearbox, but also includes a dual input shaft coaxial system, and the six forward gears are placed on either side a respective driven shaft . The traditional use of a manual transmission clutch, when the shift driver must depress the clutch pedal, so that a different gear to the gear tooth motion, the shift in the power interruption appeared therebetween, so that the output performance has intermittent .
DSG is thought of as the two functions of the combined manual gearbox, and build a single system. DSG containing two automatic clutch control, driven by electronic and hydraulic control, can simultaneously control two sets of clutch operation. When the transmission operation, a set of gear teeth are engaged, and close to the shift, the next set of gear has been pre-selected gear stage, but still in the disengaged state of the clutch; when a shift gear clutch in use separation, while the other clutch teeth engaged with the gear has been preselected to ensure that during the entire minimum shift a set of gears on the output power, so there is no discontinuity condition occurs.
fit to the above operation, the DSG drive shaft is divided into two, one is placed inside a solid shaft, and the other one is in the hollow shaft outside the set; inside a solid shaft 1,3,5 and after the connection block, and the outer hollow drive shaft connected to the gear 4 and 6, two clutches each responsible for a ratcheting action of the drive shaft, the engine power will not be made wherein a drive shaft discontinuous transmission, taking into account the life of parts, the designer chose the tank diaphragm clutch, clutch operation is controlled by a hydraulic system.
the use of two sets of clutches and before the next gear shift tooth has been pre-selected, thus DSG shift speed is very fast, just less than 0.2 seconds, the next file was already in , and faster than the manual shift best technology professional drivers, soUse the same car using DSG is more faster than MT acceleration performance.
In actual driving, the DSG gives the impression that the entire process of shifting a little feel frustrated or push-pull, just from the speed table can reflect changes in gear. In addition, DSG also a variety of driving modes, such as Sport mode, with the help of the electronic program plus the model block was significantly slow and downshifts are a big improvement, the shift time is adjusted shorter, like driving a sports car general. The driver can move the shift lever through or click the button on the steering wheel at any time the automatic mode to manual mode switching, to provide full dynamic driving style. Both sides of the steering wheel the driver can shift button can be a downshift or upshift operation without touching the shift lever, like F1 F1 car drivers to drive the same. Under intense driving environment, such as high-speed corners, the manual shift is very often necessary, with the help of the DSG, the driver in the process of shifting but also to experience the special throttle automatically increase the fun.
S tronic
S tronic dual clutch transmission is the name of Audi. Some people say that S tronic Volkswagen DSG is changed names, only half of these words, because for the Audi A3 and 7-speed transverse 6-speed dual-clutch transmission on the TT is indeed a public dry and wet DQ200 DQ250, However, in the use of Q5 speed dual clutch transmission 7 is a vertical type AWD dual-clutch gearbox, the public line is no DSG this product.
S tronic7 two horizontal type and speed, respectively, 6-speed transmission can withstand 250Nmiddot; m and 350Nmiddot; m, the precursor for the car is not a problem. Q5 is used in a vertical type S tronic gearbox can withstand more than 500Nmiddot; m or more torque.
S tronic features
gear is large and withstand higher torque: removing super sports car 911 and the dual clutch transmission Nissan GT-R, the vertical type S tronic It can withstand higher torque than other models. Horizontal Style 7Although the speed dual clutch transmission 6 speed gear more than, but its structure affects the dry torque transmission, so performance than the sixth speed, and achieve both S tronic 7 can withstand higher torque transmission section, so that comfort and both properties have both.
Equipment S tronic models
Equipment transverse formula S tronic dual clutch transmission model Audi A3, TT; vertical position of the transmission equipment models for the Audi Q5, A5.
Powershift
Powershift dual-clutch gearbox is jointly developed by Ford and transmission maker Getrag Group (Getrag). Currently there are in the country equipped with Powershift Volvo C30, XC60, S60 and some models of the Ford Mondeo.
“Powershift has features on the Volvo C30, XC60, S60 and Ford Mondeo.” [123 ]
Powershift dual-clutch gearbox was introduced in 2008, it is a manual gearbox used technology. The transmission has six forward gears, there are two independent wet clutch 450 can withstand the maximum bovine middot; of torque.
Compared with other manufacturers dual-clutch gearbox, dual-clutch gearbox Powershift maximum shift speed is not characteristic, but has a comparable exchange excellent CVT block ride. And as can withstand large torque, so that the transmission can be used in some high-powered vehicles, especially diesel vehicles match. However, because the transmission is not shifting the pursuit of speed, and not necessarily very good on acceleration.
6 PowerShift dual-clutch gearbox gear relatively light in weight, the market most 4 Gearbox lighter than currently. Lightweight design and minimal power loss can be the driver to save fuel consumption by approximately 9 percent.
PDK
PDK: Porsche Doppel Kupplung (Porsche double-clutch gearbox), double-clutch gearbox Porsche’s original technology, recent years because of the strong Volkswagen implementation, while the market was a high visibility. But in fact, in 1983, Porsche is already the PDK dual-clutch gearbox for the 956 race, and in 1985 to 962 racing was a great success on the track in 1984.
“Porsche PDK gearbox.”
Although Porsche has mastered the dual-clutch technology for years, but due to the limited time of the electronic control systems and computing power, inadequate to meet the traveling comfort and smooth in terms of requirements, resulting in the Porsche double-clutch technology press box for 25 years. With mature technology and electronic control of the hydraulic control assembly only after the formal launch of the facelift 997, the seven-speed PDK dual-clutch gearbox, fully replace the Tiptronic transmission, used in commercial products.
PDK double-clutch gearbox of a conventional manual transmission and a hydraulic control system is divided into two independent transmission components. Two radially arranged hydraulic wet clutch can be controlled using the gearbox oil provides cooling and lubrication. Currently PDK gearbox in the 911, Boxster, Cayman and Panamera have equipment.
SST
●
The dual clutch SST
Mitsubishi uses a novel dual clutch automated manual transmission system to achieve efficient power transmission, so that the car not only has the effect of a manual transmission, but also to achieve a very smooth and comfortable gear change. In the rapid process of lifting gear, since the high power transmission mechanism has a double clutch, so that they can not only rapid acceleration, but also to ensure good economy. The new transmission has three different control settings to suit different road conditions, to ensure urban driving rapid response and fast road outside the city, you can achieve lineFeeling of movement.
○
The dual clutch SST (gearshift motion) Explanation
“good dual clutch SST avoid the power loss during the transmission, “
(1) mechanical structure
the dual clutch system SST singular 1,3,5 2,4,6 gears and even-numbered gears respectively arranged on two drive shafts, each connected to a single clutch. The two clutches can be controlled accurately, thereby increasing the reaction rate and bring the smooth feeling without delay. Moreover, in terms of power output performance, it is quite smooth. By using the clutch instead of a fluid coupling to transmit power, to ensure that the dual clutch SST simpler in structure, to avoid loss of power transfer process, so that the power transmission is more efficient, and therefore, better fuel economy.
(2) driving mode
The dual clutch SST system allows the driver to choose between three shift modes: normal, motion and super motion pattern, the need to include various driving environments.
a. Normal mode
for urban traffic and other general driving conditions, the normal mode will automatically reduce the engine speed shift point, in order to ensure smoother shifting and better fuel economy.
b. Motion pattern
In the case of mountain or when engine braking is required, the engine can improve motion pattern point shift speed, the shift speed is accelerated. This will show a more rapid throttle effect, in order to increase communication with the driver of the car.
c. Super motion pattern
Compared with the movement pattern, the movement pattern ensures super shift feeling very light at a higher speed.
wet dual clutch
Wet double clutch is a double clutch means multiplate clutch 2 and a small group of coaxially mounted together, they are all mounted on a hydraulic fluid filled a closed oil chamber, the wet clutch structure therefore has a better adjustment capability and excellent thermal properties, it is capable of transmitting a relatively large torque.
Since the layout and selection of factors friction material, dimensions dry-wet double clutch for a double clutch is not advantageous arrangement of the vehicle powertrain.
dry dual clutch
We here at Volkswagen DQ200 7-speed dual-clutch gearbox as an example, it is in fact the technical basis DQ250 wet dual clutch 6-speed development comes on, simplifying the relevant hydraulic system.
It works, for a dual clutch coaxially similar size stacked clutch plate 3 is mounted, is located on both sides of the two clutch plates are connected to a, 3,5,7 and 2,4,6 stop, reverse, moving the intermediate plate therebetween, respectively, and two clutch plates ldquo; binding rdquo; or ldquo; isolated rdquo; a shift is performed by switching. Because this ldquo; dual clutch rdquo; not DQ250 gearbox is mounted as in a closed oil chamber, the dry friction plate on the movable plate can be certainly bonded to each other to bring the most direct transfer efficiency, but it is also easier to heat , it is inferior to hot wet clutch, so as to withstand the torque would be relatively small. 7 bear the maximum torque speed DQ200 250 Nm, generally with the use of small-displacement engines.