Advantage of DSG Transmission

Advantage Of DSG Transmission

·         Better fuel economy (up to 15% improvement) than conventional planetary geared automatic transmission (due lower parasitic losses from oil churning) and for some models with manual transmissions.

                   Factors in reduced fuel consumption:

                      – use of dual clutch

                      – intelligent transmission control

                      – high efficiency

                   Significantly reduced fuel consumption:

                      – 0.3 l/100 km less with 6-speed DSG

·         No loss of torque transmission from the engine to the driving wheels during gear shifts. because the change happens so quickly - around 8 milliseconds - the engine can maintain drive and the losses involved in the gear change are much reduced.

·         Shift Up to Environmental Protection Volkswagen develops environmentally friendly technologies that help reduce CO2 emmisions. CO2 emissions are cut from 144 g/km to 139 g/km.

                           

     Lower greenhouse effect over the entire life cycle:

               – reduction of 1.2 metric tons in carbon dioxide emissions with 6-speed DSG

  ·         Short up-shift time 
of 8 milliseconds when shifting to a gear the alternate gear shaft has preselected. Volkswagen's DSG takes about 8 milliseconds to upshift. Compare that to the SMT in the Ferrari Enzo, which takes 150 ms to upshift. Instant gear shifts mean faster acceleration: According to Audi, the A3 runs 0-60 in 6.9 seconds with a 6-speed manual and 6.7 seconds with the 6-speed DSG.

·         Smooth gear-shift operations

The clutch arrangement is setup for odds and evens, where clutch 1 operates the 1-3-5 gears and clutch 2 operates 2-4-6.

DSG works by allowing the software to decide what gear the car will need next, and then pre-selects it. If you are accelerating, it will have the next gear up, and likewise if decelerating, the next gear down.

·         Consistent shift time of 600 milliseconds, regardless of throttle or operational mode.

·         Combine the automatic gear-shifting of an automatic transmission, the gearbox can then tell the currently disengaged clutch (the one driving) to engage, and at the same time tells the engaged clutch (the pre-selected gear) to disengage. In this way the driver and passengers do not experience the on-off-on feeling associated with manual gearboxes. Instead, the gear change feels much more like that of an automatic gearbox.

Disadvantage of DSG Trasmission

Disadvantages of DSG Transmission

•  Less mechanical efficiency compare to manual transmission.
•  High maintenance cost.
•  High cost to manufacture, and therefore increases new vehicle purchase price.
•  Relatively lengthy shift time when shifting to a gear ratio which the transmission ECU did not anticipate.
•  Torque handling capability constraints perceive a limit on after-market engine tuning modifications.
•  Difficult to archive maximum acceleration or hill climbing, while avoiding engine speeds higher than a certain limit.
•  Heavier than a comparable Getrag conventional manual transmission.
•  Mechatronic units easy to fail and require replacement.

Customers complain

      1.       In Malaysia

•  Gearbox up shift and down shift not smooth, not engaging properly.
•  Car shaking and the engine check light blinking.
•   The car jerk when accelerating, cornering, reversing, or when changing 1st to 2nd gear at low speed.

Volkswagen Malaysia takes action by inviting all Volkswagen owners to participate in Volkswagen DSG Service Campaign. Owner need to bring their car for a software upgrade.

      2.       In United State of America

•  Unplanned shifts to the neutral gear.
•  Faulty temperature sensors.
• Loss of power while driving.

Due to the problem occurs Volkswagen of America issued two recalls of their DSG-equipped vehicles in august 2009. The first involved 13,500 vehicles while the second involved 53,300 vehicles.

      3.       In China

• Spontaneous vibrations, sporadic jerking and strange noise.
• Engine shutdowns when the juddering occurred.

Volkswagen issued an official apology to Chinese customers and acknowledged the issues that the dual clutch transmission has been causing in its vehicles. They takes drastic action by extent warranty on its DSG gearbox to ten years or 160,000 Km, whichever comes first.

History of Transmission Systems

Car transmissions were not always like this. The ones we see today are the result of an incremental evolution and development over the past century. The earliest transmissions were all of manual type. Later on a fusion of computing technology with well evolved manual transmissions led to the creation of automatic transmission systems in cars. Manual transmissions still continue to be just as popular as they used to be for the sole reason that they give the driver a sense of thrill through the ability to shift gears up or down at any desired moment.

The transmission in a car is an intertwined system of gears, shafts and other parts that form a bridge to transfer power from the engine to the wheels. The setup helps the car maintain its cruising speeds and slow down or rev up depending on the condition of the road. It does all this without affecting the engine’s performance at any time.

The first manual transmission was introduced by a company called Warner Gear (now BorgWarner) in 1927. It was a four speed gearbox with an H-shaped pattern. It helped the car achieve high speeds with ease and at no discomfort to the occupants. In 1930, an improved technology was introduced. Car manufacturers were now encouraged to try out different technologies in gearboxes. One such noticeable improvement was in the Buick Series 40 from Chrysler Corporation in 1939 where springs were employed to exert high pressure on the clutch plates while the driver was required only to apply light pressure on the clutch pedal to start or stop the car. However, the system soon saw several technical problems and became redundant.

After weighing other options, Chrysler settled for a fluid drive system in which the clutch pedal was operated in two vaned plates. Power was transmitted through shearing action in low viscosity mineral oil. Through this new concept drivers could stop the car without using the clutch, while leaving the gear in high mode. However, this system too did not find many takers and was eventually dropped.

The next new system to be developed used a sliding spur gearbox with three or four forward gears and a reverse gear integrated into it. This was the beginning of the modern gear box. The shifter slid a spur gear into the desired position to employ engine power. In the early stages, the shifter moved with great stiffness and required skill to prevent the clutch teeth from clashing against each other. Later on, the clutch plates were synchronized with the shifter so that the parts moved in unison. The only hurdle left for the driver was that the shifter needed to move simultaneously with the accelerator pedal, clutch pedal and the gearshift model.

Transmission design remained nearly the same for several years to come until the first automatic transmission was developed. The automatic transmission was introduced first in some luxury cars before it was adapted to small cars. Though automatic transmissions became popular due to ease of use, many people today still prefer manual transmissions on their cars. 

TRANSMISSION

DSG – the dual-clutch gearbox from Volkswagen

The innovative DSG dual-clutch gearbox from Volkswagen offers previously unattained shifting comfort that lifts what were once well-defined boundaries between automatic and manual transmissions. This is a 6-speed gearbox that combines the sporty character and low fuel   consumption of a manual gearbox with the comfort and convenience of an automatic. Another highlight: gear changes are executed without any interruption of the driving power

The decision as to which gear should be engaged next is taken by the control unit based on the position/operation of the accelerator, engine speed and vehicle speed. If the accelerator pedal is pressed and the vehicle accelerated, the next-highest gear will be preselected before the shift point is reached. If the accelerator is not operated, however, i.e. the vehicle is in overrun, the next-lowest gear will be preselected.

4 MOTION

4MOTION gives you great grip on the road, come rain, wind or snow. So, however treacherous the road surface, you get a sure-footed car with huge levels of traction.
Volkswagen four-wheel drive systems work hard to keep you safe, linking with other active safety systems on your Volkswagen to constantly monitor driving conditions. It reacts to even the slightest wheel slip and automatically sends the right amount of power to the wheels with the most grip. The second it detects a problem, it delivers extra traction where it's needed.
As a driver, you get reassuring stability and optimum control. And the confidence that your Volkswagen can safely tackle the roughest roads and the worst weather conditions. That lets you relax and enjoy your drive, knowing that 4MOTION is always on the alert to keep you safe and help you out of tricky situations. It will take snow and ice, slippery roads and muddy tracks in its stride, and help you get out of places where a normal car would be stuck.

Split-second action.

All this happens in milliseconds,

MANUAL TRANSMISSION

Manual transmission lets you take charge and use all the power of the engine for a positive response when you need it.
Volkswagen manual gearboxes are highly efficient and designed to add to your driving pleasure. Manual versions of their cars come with either 5 or 6-speed transmissions.

More gears mean less fuel

Their 5-speed gearbox is positive and easy to use, with the top gear reducing engine revs and therefore improving fuel

AUTOMATIC TRANSMISSION

Automatic transmission takes the hard work out of driving, especially when you're crawling along in heavy traffic or on long motorway hauls.
Automatic transmissions make driving easier by taking over the decision of when to change gear and leaving you to concentrate on the traffic and road conditions.
The automatic transmission automatically adapts to your driving style at any given time - from leisurely cruising to sporty performance - and also takes the road conditions into account. It not only reduces strain on the engine and transmission in stop-start traffic, but also reduces stress on the driver.

Built-in safety

The 'keylock' and 'shiftlock' functions of the automatic transmission provide extra safety. 'Keylock' stops the ignition key from being removed unless the gear selector lever is in the Park (P) position.

Volkswagen's Direct Shift Gearbox

Volkswagen’s Direct Shift Gearbox (DSG) is the world’s first dual-clutch automated manual gearbox in a production car. This provides the driver the ease-of-drive of a car equipped with an automatic transmission, but the efficiency and flexibility of a manual transmission.

..ABOUT TRANSMISSION..

All the automobile now consists of a power source and a power transmission system. Both of them actually provides controlled application of the power.

The definitions of the transmission were defined by three:

1. Merriam Webster were defined that transmission as a setting-up of parts including the speed changing gears and the propeller shaft by which the power is transmitted from an engine to a live axle. Generally, transmission were simple defines as a gearbox which are provides speed and torque conversions from a rotating power source to another device.