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| Diagram 1.0: DSG Cuteaway Engines |
Transmission Technology
Direct Shift Gearbox (DSG) The twin-clutch transmission, also known as the Direct Shift Gearbox (DSG) or dual-clutch transmission, is an automated transmission that can change gears faster than any other gear transmission. Twin-clutch transmissions deliver more power and better control than a traditional automatic transmission and faster performance than a manual transmission.
The twin-clutch transmission is essentially two separate transmissions with a pair of clutches between them. One transmission (or gearbox) provides odd-numbered speeds (ie first, third and fifth gear), the other provides even-numbered speeds (second, fourth and sixth). When the car starts out, the "odd" gearbox is in first gear and the "even" gearbox is in second gear. The clutch engages the odd gearbox and the car starts out in first gear. When it's time to change gears, the transmission simply uses the clutches to switch from the odd gearbox to the even gearbox, for a near-instant change to second gear. The odd gearbox immediately pre-selects third gear. At the next change the transmission swaps gearboxes again, engaging third gear, and the even gearbox pre-selects fourth gear. The twin-clutch transmission's computerized controller calculates the next likely gearchange based on speed and driver behavior and has the "idle" gearbox pre-select that gear.
Benefits of Technology
Twin-clutch/DSG transmissions is the ability to perform matched-rev downshifts. When a driver selects a lower gear, both types of transmission disengage the clutch(es) and rev the engine to the exact speed required by the selected gear. Not only does this make for a smoother downshift, but in the case of the twin-clutch transmission, it allows plenty of time for the proper gear to be pre-selected. Most (though not all) twin-clutch transmissions can skip gears when downshifting, i.e. shifting from 6th gear directly down to 3rd gear -- and because of their ability to match revs, they can do so without the lurching or surging typical of traditional automatic and manual transmissions.
Reference : http://cars.about.com/od/thingsyouneedtoknow/a/ag_howDSGworks.htm
See the Video in Youtube
http://www.youtube.com/watch?v=WVWP7TYhP0c
Twin-clutch/DSG transmissions is the ability to perform matched-rev downshifts. When a driver selects a lower gear, both types of transmission disengage the clutch(es) and rev the engine to the exact speed required by the selected gear. Not only does this make for a smoother downshift, but in the case of the twin-clutch transmission, it allows plenty of time for the proper gear to be pre-selected. Most (though not all) twin-clutch transmissions can skip gears when downshifting, i.e. shifting from 6th gear directly down to 3rd gear -- and because of their ability to match revs, they can do so without the lurching or surging typical of traditional automatic and manual transmissions.
Reference : http://cars.about.com/od/thingsyouneedtoknow/a/ag_howDSGworks.htm
See the Video in Youtube
http://www.youtube.com/watch?v=WVWP7TYhP0c
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