1.DSG transmission
Introduction
DSG (Direct-Shift Gearbox) transmission is currently the world the most advanced, revolutionary transmission system, Volkswagen in Wolfsburg, Germany in 2002, first demonstrated the technology innovation to the world. Generation DSG transmission a dual clutch six forward gears and a conventional gear transmission as a power transmission member, the primary and high-torque engine with use. Volkswagen invested 150 million euros Volkswagen factory in Kassel, for the manufacture of DSG transmission, the plant maximum daily capacity of 1,000 units.
Characteristics:
generation DSG transmission uses two clutches and six forward gears conventional gear transmission as the power transmission unit, which is the world’s most advanced, revolutionary automatic transmission.
DSG transmission without a torque converter, there is no clutch pedal.
DSG transmission energy loss in the transmission process is very small, greatly improving the fuel economy of the vehicle.
The reaction
the DSG transmission is very sensitive, with a good driving pleasure.
vehicle during acceleration will not have the feeling of power interruption, the acceleration of the vehicle more powerful, smooth. Hundred kilometers acceleration time is shorter than a conventional manual transmission.
DSG transmission power transmitting member is a three shaft 6 forward gears traditional gear shift, increasing the ratio of distribution.
Wet multi-plate dual clutch transmission DSG by electro-hydraulic control system manipulation.
using a double clutch, the transmission may also have two meshing gears, the shift operation more efficient.
DSG manual and automatic transmission has two control modes, in addition to the gearshift lever may control the outer wheel is further equipped with manually controlled shift buttons, in motion, can always switch between two control modes.
In manual mode, if an upshift is not operating, even if the throttle in the end, not the DSG transmission upshift.
shift control logic can be controlled according to the wishes of the driver’s shift.
In the manual control mode, skip downshift.
Advantages:
DSG transmission designed to meet consumer demand for sporty driving and a double vehicle fuel economy requirements, provide for those who are fond of driving a manual transmission best choice. DSG brought low fuel consumption while the vehicle without any loss of performance, also has excellent acceleration and top speed, and as with conventional automatic transmissions can be achieved smooth shifting, without affecting traction.
Since the engine is equipped with DSG can generate rapid conversion of the gear immediately traction and flexibility, acceleration time is more rapid than the manual transmission. To the Golf GTI, for example, models 0-100 km acceleration in just 6.9 seconds with DSG, this result is faster than the manual transmission models, reaching a top speed of 235 km, while at the same level. Even more impressive is that the performance improved, with DSG models one hundred kilometers fuel consumption of just 8.0 liters, with manual models fairly.
Technical Description:
DSG different from the general semi-automatic gearbox system, which is based on the structure of the manual transmission instead of the automatic transmission, manual transmission than automatic transmission more efficient, can withstand torque is greater (currently on the TT DSG can withstand 350Nm), while the DSG has a flexible and comfortable in addition to a manual transmission and automatic transmission, which offers non-stop more power output.
a conventional manual transmission using a clutch, a shift operation is divided into three movements: the clutch release – shifting a shift fork toggle synchronizer (front gear isolated / new gear glued) – – clutch, three actions are carried out successively divided, the driver must depress the clutch pedal, so that a different blockThe gear teeth together to make the action, and the power shift appeared intermittently in the meantime, so that the output performance has been intermittent.
a conventional automatic transmission with no clutch control of the engine output shaft off, but by the torque converter with a planetary gear set for the shift. It is a manual transmission except differences in automatic control, the maximum difference is mechanically planetary gear set is normally glued state, a certain gear clutch – brake, to produce different gear ratios.
DSG is conceivable that the two functions of the combined manual gearbox, and build a single system, he did not torque converter planetary gearset. At first glance from the gear portion like a manual transmission, because it has a synchronizer, except that he ldquo; bis rdquo; clutch control and engine power-off, these two automatically controlled clutch controlled by the electronic and hydraulic thrusters, 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, the four movements are carried out simultaneously and under the control action of the electronic control unit, so that the shift reaction is very fast, during the entire shift ensure that at least one set gear output power, so there is no interruption condition occurs. To fit the above operation, DSG’s drive shaft is divided into two, one is put in a solid inside the shaft, and the other is outside the hollow drive shaft; inside solid driveshaft is connected to 1,3,5 and after block, while the outside of the hollow shaft is connected, 4 and 6-speed, two each responsible for a clutch of the ratcheting action of the drive shaft, wherein the engine power will make an uninterrupted transmission shaft. From the layout point of view, this transmission length is very short (about half the length of a conventional six-speed transmission), the precursor can be used on the front of the vehicle.
As to control systems, electronic and hydraulic control system at the top of the gearbox 12 connected to an independent group of DSG sensors, vehicle driving information together state, so as to promote the operation of each valve and other components, and two clutch hydraulic pressure to be adjusted by a dedicated electronic control shutter driving conditions vary. The electronic control system is also responsible for calculating the proper speed to be preselected segment management and other control lever, And the control valve 5 will be set by the on-off valve 6 sets to monitor the hydraulic pressure cooling system.
To handle DSG, the driver can take advantage of the shift lever on the steering wheel or the shift plate for sequential manual shifting, shifting during operation of the clutch is fully computer controlled referred DSG. Whether manual mode during running, automatic shift mode or the D or S, as long as the time lag of the shift sheet pat steering wheel, the DSG mode and immediately switch to manual gear shifting procedure, there is no rapid acceleration conventional automatic transmissions sense. But there is no buffering of the hydraulic pitch will shift the transmission conventional soft acceleration is better, and it is applied to focus control of car acceleration, and not to focus on comfort limousines.
common categories:
DSG two forms, commonly known as ldquo; wet rdquo; and ldquo; dry rdquo ;.
ldquo; wet rdquo; dual clutch of the dual clutch is a multiplate clutch 2 and a small group of coaxially mounted together, and the reverse gear are connected to 3,5 and 2,4 , 6 speed gear. ldquo; wet rdquo; refers to a dual clutch mounted on a closed oil chamber filled with hydraulic oil’s. Such ldquo; wet rdquo; structure having better heat regulation and excellent compatibility, and therefore a relatively large torque can be transmitted. 6 DSG speed matches the maximum torque of 350 Nm engine. In the Chinese market, Magotan 1.8TSI and 2.0TSI two domestic models and Volkswagen CC, R36, EOS, Scirocco, Volkswagen Magotan 3.2FSI and other imported models are equipped with six-speed DSG.
ldquo; dry rdquo; dual clutch of the dual clutch of three similarly sized clutch plate mounted coaxially stacked composition. Located on both sides of the two clutch plates are coupled and 1,3,5,7 2,4,6 speed gear and the reverse gear, the intermediate plate therebetween in the movement, respectively, and two clutch plates ldquo; binding rdquo; or ldquo; rdquo ;, separation is performed by switching a shift. Because of its ldquo; dual clutch rdquo; not like gear 6 is attached to the closure DSG as an oil chamber where it is called ldquo; dry rdquo; dual clutch. ldqUO; dry rdquo; dual clutch structure is simple, and thus more efficient. However ldquo; dry rdquo; intrinsic characteristic of the clutch structure itself so that it can withstand a maximum torque ratio ldquo; wet rdquo; lower clutch. 7 DSG speed matches the maximum torque of 250 Nm ldquo; small rdquo; engines. Is generally believed that, ldquo; dry rdquo; is less ldquo; wet rdquo; more advanced.
is simply sum up the advantages of both: ldquo; dry rdquo; dual clutch structure is simple, and thus more efficient, stable and economical. Relatively complicated structure ldquo; wet rdquo; terms, the failure rate is less. And ldquo; wet rdquo; power is even more powerful. Although the basic ldquo; dual-clutch rdquo; principle is the same, but the whole works is very different.
shortcomings:
First, compared with the conventional automatic transmission, since no hydrodynamic torque for small displacement, and no semi-linkage of MT, the combination of engine and DSG, and sometimes there will be shortage of low-speed torque phenomenon, showing a slight shake when starting. Secondly, because of a computer-controlled intelligent DSG gearbox, its lifting gear to the engine needs to send a signal through the computer, and to wait for the engine to complete the lifting gear reply after confirmation. One more link to one more possible points of failure, the use of intelligent electronic devices increases the chance of failure. Judging general, in the era of advocating low-carbon, DSG represents the future development direction of transmission.
FAQ:
1, slow speed
Consumers reaction speed can not be increased, or abnormal noise sense of frustration at low speed shift. Obviously not smooth sensation when just starting when the transmission 1 can clearly feel the speed and the second speed engaged, and upon starting the same flat road slope start phenomenon.
2, stuck
is particularly of concern is the emergence of the phenomenon of death card, allowing consumers concerns about driving safety. Maintaining engine speed above 3000 rpm to achieve the odd gears: 1,3,5 shifting, the even-numbered gears can not be engaged 2,4,6, evenTo cause the vehicle stuck.
3, flameout
First, stall occurs when the vehicle starts and operation. Some consumers reflect: the first time, dealers said oil quality is poor, resulting in the car coke. However, for a high-quality oil problem remains. Second, 4S shop can be declared free testing, but had to deal with failure to collect the money. Coke cleaning the engine and increase idle speed of the engine, which was the approach of the automatic transmission car flameout fault. However, the problem remains unresolved.
4, unable to upshift
also sounds more serious, that there will not upshift, consumers know what to do. At low speeds, the engine speed suddenly increases, the speed remains unchanged. After stopping the engine system failure on the left side of the dashboard tachometer indicates the yellow light. Turn off the heat, start driving later, DSG transmission remains at 1 block, not an upshift normal, and can not achieve the reverse gear.