2006/10/17 14:19 Automobile
DSG (Direct Shift Gearbox)
알아보려고 검색한 것들을 올려본다..
일단 아래 결과에서 유추해보면 클러치 페달은 없으며 즉 자동변속기와 같은 느낌으로 운전하게된다..
그렇게 할 수 있는 것은 클러치를 2개 사용하여 하나는 직접 동력전달, 나머지 하나는 다음 변속을 위해 다음 기어에 맞물리도록 준비 되어 변속을 하게 되면 첫번째 클러치는 해제, 두번째 클러치가 걸려 변속이 이루어짐...정도인가..
얼른 영어실력을 키워야지.. ㅡㅜ
우선 네이놈 즐에서..
직접 변속 장치(DSG)의 기술적 토대는 더블 클러치에 있습니다. 이는수압으로 접촉 압력을 조절하는 두 개의 습판식 클러치로이루어져 있습니다. 두 개의 클러치 중 하나는 홀수 기어에, 다른 하나는짝수 기어에 맞물립니다. 이 원리는 동력 흐름이 끊기지않는 상태에서 기어를 바꿀 수 있도록 해주고 변속 시간을 극히 짧게유지해줍니다. 첫 번째 클러치가 동력을 전달하는 동안 두 번째클러치는 미리 선택된 다음 기어에 맞물릴 준비가 됩니다. 운전자가기어 변속을 할 때 첫 번째 클러치는 해제되고 두 번째 클러치가걸려 기어 변속이 몇 분의 1초 사이에 이루어지게 됩니다.
운전자는 DSG를 수동으로 조작할 수도 있고 자동으로 변속이 이루어지도록 할 수도 있습니다. 자동 모드에서는, 균형이 잘잡히고편안한 표준 변속 방식과 스포츠 특성을 더 강조한 프로그램 중 하나를 선택할 수 있습니다. 수동 변속은 기어 레버나스티어링 휠뒤에 있는 변속 패들을 이용하게 됩니다.
따라서 이 혁신적인 변속 장치는 수동 변속기의 스포츠적인 특성과 자동 변속기의 이점을 하여 스포티한 주행을 하거나, 아주 경제적인 주행을 하거나, 아니면 이 두 가지를 자신이 원하는 대로 조합할 수도 있습니다.
Direct-Shift Gearbox
From Wikipedia, the free encyclopedia
The Direct-Shift Gearbox (Direktschaltgetriebe) is a dual-clutch gearbox designed by BorgWarner and initially licenced to Volkswagen Group (which owns the Volkswagen, Audi, SEAT, Bentley, Bugatti, Lamborghini, and Škoda brands). By using two clutches, fast shifts can be achieved, and the torque converter of a regular automatic transmission is eliminated.
Essentially, the engine drives both clutch packs. The outer clutchpack drives gears 1, 3, and 5 (and reverse). The inner clutch packdrives gears 2, 4, and 6. Instead of a standard large dry clutch, eachclutch pack is a collection of four small wet interleaved clutchplates. Due to space constraints, the two clutch assembies areconcentric. Because the alternate clutch pack's gearing can bepre-selected (predictive shifts taking place while the other section isin use), un-powered time while shifting is avoided because power issimply switched from one gearbox to the other. The DSG takes about 8milliseconds to upshift[1]. Compare that to the SMT in the Ferrari Enzo, which takes 150 ms to upshift[1]. The quoted time for upshifts is only the time the engine is completed non-powered.
VW group vehicles available in Europe with the DSG gearbox include:
- Audi TT and A3. Audi have named the DSG "S-Tronic" in newer models.
- Bugatti Veyron 16.4 (* not a Borg Warner DSG, but marketed as one due to parent company)
- SEAT Altea, Toledo, and León
- Škoda Octavia
- Volkswagen Passat, New Beetle, Golf/Rabbit/GTI/R32, Touran, Eos, and Jetta/Bora.
Notes
External links
Volkswagen and Audi's Direct Shift Gearbox (DSG)
What it is and how it works
The Direct ShiftGearbox (DSG), also known as the double-clutch gearbox, is atransmission developed by Audi and Volkswagen. What makes it special isthat it can change gears faster than any other geared transmission. TheDSG can be shifted either manually or automatically. It delivers morepower and better control than a traditional automatic transmission andfaster performance than a manual transmission.The DSG is a development of the sequential manual transmission (SMT),which is essentially a fully-automated manual transmission with acomputer-controlled clutch. Before we delve into the workings of theDSG, let's start with an explanation of the SMT.
SMT: The control of a manual with the ease of an automatic
Though it has appeared on a few passenger cars, the SMT is widely usedin certain forms of racing and is featured on Ferrari's Enzo supercar.Cars with SMTs have no clutch pedal; the clutch is automatically engaged.
Most SMTs can be shifted automatically or manually, the latter using ashift lever or paddles on the steering wheel. The advantage to an SMTis that it uses a solid coupling, as opposed to a fluid coupling(torque converter) as used in a traditional automatic (includingTiptronic- or manumatic-style transmissions). As with a manualtransmission, the SMT provides a direct connection between engine andtransmission, allowing 100 of the engine's power to be transmitted tothe wheels. The SMT provides more immediate response and ensures thatthe engine RPMs do not drop when the driver lifts off the accelerator(as happens with an automatic), giving her more precise control overpower output.SMTs can also perform matched-rev (our double-clutch) downshifts: Whenthe driver downshifts, the SMT disengages the clutch, shifts toneutral, and re-engages the clutch. The SMT calculates what the engineRPMs will be in the next-lowest gear based on the current road speed,and revs the engine (and, since the clutch is engaged, thetransmission) to that speed. It then disengages the clutch, shifts intothe lower gear, and re-engages the clutch. The result is a smoothchange with no jerk and no sudden deceleration.
SMTs have one major disadvantage, same as a manual: Power must be interrupted while the transmission changes gears.
DSG: An SMT without the lag
The DSG all but eliminates the lag inherent in SMTs. The DSG isessentially two 3-speed gearboxes with a pair of clutches. When thedriver starts out, transmission #1 is in first gear and transmission #2is in second. The clutch engages and the car starts out in first. Whenit's time to change gears, the DSG uses the clutches to swaptransmissions. The #1 transmission immediately shifts to third gear. Atthe next change the DSG swaps transmissions again, and #2 shifts tofourth. The DSG's computerized controller calculates the next likelygearchange and shifts the "idle" transmission into that gear. Theadvantage is the speed of gearchanges: The DSG takes about 8milliseconds to upshift. Compare that to the SMT in the Ferrari Enzo,which takes 150 ms to upshift. It's also significantly faster than ahuman: According to Audi, the A3 runs 0-60 in 6.9 seconds with a6-speed manual and 6.7 seconds with the 6-speed DSG. Like the SMT, theDSG performs double-clutch downshifts and can skip gears (i.e.downshifting from 6th directly to 4th, 3rd, etc).Driving with the DSG
The DSG uses a traditional P-R-N-D-S shift pattern. It can shiftautomatically in either normal (D) or Sport (S) modes. In Normal mode,the DSG shifts to the higher gears early in order to minimize enginenoise and maximize fuel economy. In Sport mode the transmission holdsthe lower gears longer in order to keep the engine in its powerband.This is especially useful for turbocharged cars like Audi A3, VW GTI and VW Jetta GLI,since the turbocharger is only active at higher RPMs. Sport mode alsoprovides more aggressive downshifts with slight accelerator pedalpressure.Manual mode is engaged by either sliding the shift lever to the side orpulling one of the paddles on the steering wheel. Once in manual mode,shifts are made by moving the shifter fore and aft or using the paddles(which are marked " " and "-"). If manual mode was engaged with thepaddles, pulling and holding the upshift paddle.
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