Double Swift Gearbox (DSG)

The Manual gearbox works on a single clutch in which the power from the engine to the wheels are interrupted during gearshifts while the Double Swift Gearbox has dual clutch gearbox which helps in changing the gears without interrupting the power flow from engine to the transmission.

Double Swift Gearbox

DSG or Direct shift Gearbox is a groundbreaking dual-clutch concept that takes automatic transmission Technology even further.

Why have one clutch when you can have two? To understand the advantages of a twin-clutch system, let’s rewind to how a conventional manual gearbox works. When you want to change gears in a manual ‘box, you press down on the clutch pedal to operate a single clutch which disconnects the engine from the gearbox. Releasing the clutch reconnect the engine to the gearbox and transmits power back to the wheels.

In a manual transmission, power from the engine to the wheels is interrupted during gearshifts. I you have ever sat with someone just learning to drive, you can feel this interruption most acutely.

The DSG on the other hand is a dual-clutch gearbox. Sophisticated electronics and mechanicals control the clutch, just as they do in a standard automatic transmission. However, in a DSG, one clutch controls the odd gears (first, third, fifth, seventh and reverse), while the other controls the even gears (second, fourth and sixth). Thus, gears can be changed without interrupting the power flow from the engine to the transmission. That’s the trick that allows lightning-fast gear changes and keeps power delivery constant.

A conventional automatic gearbox uses a viscous or liquid coupling known as a torque converter, instead of a clutch. But torque converters sap a lot of power from the engine, so performance and efficiency both suffer. This makes the DSG more efficient than a conventional automatic transmission.

Skoda was the first company to offer this advanced automatic transmission in India on the Laura way back in 2005. It had six gears and came mated to a strong diesel engine. Now, you can also get a seven-speed DSG transmission in the new Skoda Superb and most other companies have their own twin-clutch autos.

How does it work while driving? When you select Drive mode, one shaft selects first gear on ‘standby’. As the gearbox change to second, the second shaft is engaged and the original shaft reaches third. As you shift upwards, the sequence continues in a series of seamless moves. Because power is simply switched from one shaft to another, gear shifts, are not only silky smooth but also very fast. Each change takes around eight milliseconds.

The DSG gearbox, apart from being seamless and quick, is also smart. For example, if you are braking heavily, if you are braking heavily into a tight corner with the intent of downshifting two or even three gears, the computer will respond to your braking and steering input and change down either more quickly or skip past gears altogether. This allows you to keep the revs in the best range for drivability. Likewise, if driving in snow or mud, the computer will control wheelspin at low speeds, by shifting up into a higher gear.

And if you want to take over, you can control the DSG manually. Nudge the Tiptronic gearlever forwards or backwards to change gear, or use the puddle shifts mounted on the steering wheel to go up or down. Seamless, lightning-fast gear changes along with the control of a manual ‘box, now that’s something only a DSG ‘box can give you.

Thanks to the dual-clutch design, the DSG is more efficient than conventional automatic transmissions. This efficiency, together with its low weight and intelligent control, means the DSG can achieve the same, and in some instances better, fuel consumption than a manual gearbox or even lower, depending on the style of driving.

So the next time you drive a Skoda with a DSG gearbox, and slot the drive into D, you will not be wrong to think that D stands for Delight.

Source: Autocar September 2011

Popular Car Comparisons

Ameo Highline DieselAmaze VX MT DieselSwift Dzire VDi O

Sub 4 meter is still alive and kicking and more so with diesel power plant. No wonder VW finally launched its diesel Ameo to take on the like of Honda Amaze, Swift Dzire and Hyundai Xcent, not to forget tata motors cars in the same segment. It's true that with diminishing difference in diesel and petrol fuel prices, the skew as expected and envisioned by ecardlr.com even during the era of dieselisation, Indian car buyers are now buying more of petrol cars. Yet there are few diesel die hard fans, a segment which VW has decided not to ignore and launched the Ameo diesel version. How it compares with established stalwarts like; Swift Dzire, Honda Amaze and Hyundai Xcent, read on and decided yourself.

Write a Review

Do a Good Deed Today. Reviews on cars and/or dealership on www.ecardlr.com have been written by people like you. These honest, candid reviews on cars or their dealership experience help others like you and all of us help take a right decision. It's your turn now to return their good deeds with a review on any car/or dealership that you might have been lately. Please write a review on a car and/dealership and help other car buyers in India.

Car Advice By Car Experts

Which is the Best Buy Between Elantra SX and SX (O)

Recently launched New Hyundai Elantra it seems have left no stone stone unturned to please its buyers with some great features. Based on Creta's success and Indian car buyers comfort with Hyundai ....Read More

Dealer Locator

Service Centre Locator