R edit r position of the floor-mounted shift lever means that the transmission is in reverse. This functions in a similar way to d, but there is just one reverse gear. When selected, r is highlighted in the instrument display. Manual mode edit Additionally, the floor shift lever also has another plane of operation, for manual 4 mode, with spring-loaded and positions. This plane is selected by moving the stick away from the driver (in vehicles with the driver's seat on the right, the lever is pushed to the left, and in left-hand drive cars, the stick is pushed to the right) when in D mode only. When this plane is selected, the dsg can now be controlled like a manual gearbox, albeit only under a sequential shift pattern. In most (VW) applications, the readout in the instrument display changes to, and just like the automatic modes, the currently used gear ratio is highlighted or emboldened.
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9 That means that shifts will change up and down very early in hostess the rev-range. As an example, on the volkswagen Golf Mk5 gti, sixth gear will be engaged around 52 km/h (32 mph when initially using the dsg transmission with the default ecu adaptation; although with an "aggressive" or "sporty" driving style, the adaptive shift pattern will increase the vehicle speed. S mode edit The floor selector lever also has an S position. 2 When s is selected, sport mode 2 is activated in the dsg. Sport mode still functions as a fully automatic mode, identical in operation to d mode, but upshifts and downshifts are made much higher up the engine rev-range. 2 9 This aids a more sporty driving manner, 2 by utilising considerably more of the available engine power, and also maximising engine braking. However, this mode does have a detrimental effect on the vehicle fuel consumption, when compared to d mode. This mode may not be ideal to use when wanting to drive in a sedate manner; nor when road conditions are very slippery, due to ice, snow or torrential rain — because loss of tire traction may be experienced (wheel spin during acceleration, and may. On 4motion online or quattro-equipped vehicles this may be partially offset by the drivetrain maintaining full-time engagement of the rear differential in S mode, so power distribution under loss of front-wheel traction may be marginally improved. S is highlighted in the instrument display, and like d mode, the currently used gear ratio is also displayed as a number.
Under "normal progressive and linear acceleration and deceleration, the dsg shifts in a sequential manner;. E., under acceleration: 1st 2nd 3rd 4th 5th 6th, and the same sequence reversed for deceleration. However, the dsg can also skip the normal sequential method, by missing gears, and shift two or more gears. This is most apparent if the car is being driven at sedate speeds in one of the higher gears with a light throttle opening, and the accelerator pedal is then pressed down, engaging the kick-down function. During kick-down, the dsg will skip gears, 9 shifting directly to the most appropriate gear depending on speed and throttle opening. This kick-down may be engaged by any increased accelerator pedal opening, and is completely independent paper of the additional resistance to be found when the pedal is pressed fully to the floor, which will activate a similar kick-down function when in Manual operation mode. The seven-speed unit in the 2007 Audi variants will not automatically shift to 6th gear; rather, it stays at 5th to keep power available at a high rpm while cruising. Citation needed When the floor-mounted gear selector lever is in position d, the dsg works in fully automatic mode, 4 with emphasis placed on gear shifts programmed to deliver maximum fuel economy.
2 This method of operation continues in the same manner for the remaining forward gears. Downshifting is similar to up-shifting but in reverse order, and is slower, at 600 milliseconds, due to the engine's Electronic Control Unit, or ecu, needing to 'blip' the throttle so that the engine crankshaft speed can match the appropriate gear shaft speed. 2 The car's computer senses the car slowing down, or more power required (during acceleration and thus engages a lower gear on the shaft not in use, and then completes the downshift. The actual shift points are determined by the dsg's transmission ecu, which commands a hydro-mechanical unit. 2 The transmission ecu, combined with the hydro-mechanical unit, are collectively called a mechatronics 2 unit or module. Because the dsg's ecu uses fuzzy logic, the operation of the dsg is said to be adaptive ; dubious discuss that is, the dsg will "learn" how the user drives the car, and will progressively tailor the shift points accordingly to suit the habits. Citation needed In the vehicle instrument display, between the speedometer and tachometer, the available shift-lever positions are shown, the current position of the shift-lever is highlighted (emboldened and the current gear ratio in use is also displayed as a number.
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The clutch pack for second gear (K2) gets ready to engage. When the driver releases the brake pedal, the K2 clutch pack increases the clamping force, allowing the second gear to take up the drive through an increase of the bite point, and thereby transferring the torque from the engine through the transmission to the drive. Depressing the accelerator pedal engages the clutch and causes an increase of forward vehicle speed. Pressing the throttle nano pedal to the floor (hard write acceleration) will cause the gearbox to "kick down" to first gear to provide the acceleration associated with first, although there will be a slight hesitation while the gearbox deselects second gear and selects first gear. As the vehicle accelerates, the transmission's computer determines when the second gear (which is connected to the second clutch) should be fully used.
Depending on the vehicle speed and amount of engine power being requested by the driver (determined by the position of the throttle pedal the dsg then up-shifts. During this sequence, the dsg disengages the first outer clutch whilst simultaneously engaging the second inner clutch 2 (all power from the engine is now going through the second shaft thus completing the shift sequence. This sequence happens in 8 milliseconds (aided by pre-selection and can happen even with full throttle opening, and as a result, there is virtually no power loss. 2 Once the vehicle has completed the shift to second gear, the first gear is immediately de-selected, and third gear (being on the same shaft as 1st and 5th) is pre-selected, 2 and is pending. Once the time comes to shift into 3rd, the second clutch disengages and the first clutch re-engages.
In comparison, the sequential manual transmission (SMT) in the ferrari F430 Scuderia takes 60 milliseconds to shift, or 150 milliseconds in the ferrari Enzo. The"d time for upshifts is the time the wheels are completely non-powered. Dsg controls edit The direct-shift gearbox uses a floor-mounted transmission shift lever, very similar to that of a conventional automatic transmission. 9 The lever is operated in a straight 'fore and aft' plane (without any ' dog-leg ' offset movements and uses an additional button to help prevent an inadvertent selection of an inappropriate shift lever position. P edit p position of the floor-mounted gear shift lever means that the transmission is set in park.
Both clutch packs are fully disengaged, all gear-sets are disengaged, and a solid mechanical transmission lock is applied to the crown wheel of the dsg's internal differential. This position must only be used when the motor vehicle is stationary. Furthermore, this is the position which must be set on the shift lever before the vehicle ignition key can be removed. N edit n position of the floor-mounted shift lever means that the transmission is in neutral. Similar to p above, both clutch packs and all gear-sets are fully disengaged; however, the parking lock is also disengaged. D mode edit Whilst the motor vehicle is stationary and in neutral ( n the driver can select D for drive (after first pressing the foot brake pedal ). The transmission's reverse gear is selected on the first shaft K1, and the outer clutch K2 engages at the start of the bite point. At the same time, on the alternate gear shaft, the reverse gear clutch K1 is also selected 2 (pre-selected as the gearbox doesn't know whether the driver wants to go forward or reverse.
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6 This was initially available in their quattro all-wheel-drive variants, 7 and is very similar to the new zf friedrichshafen -supplied 16 Porsche doppel-Kupplung (PDK). 17 18 List of dsg variants edit name Orientation Ratios Max. Torque (Nm) Clutch type dq200 Transversal 7 250 Dry dq250 Transversal 6 400 Wet DQ380 19 Transversal 7 380 Wet DQ381 Transversal Wet DQ500 Transversal 7 600 Wet DQ511 Transversal 10 550 Wet DL382 Longitudinal 7 400 Wet DL501 Longitudinal 7 600 Wet Operational introduction. 2 4 The outer clutch pack drives gears 1, 3, 5 2 (and 7 when fitted and reverse 2 — the outer clutch pack has a larger diameter compared to the inner clutch, and can therefore handle greater torque loadings. The inner clutch pack drives gears 2, 4, and. 2 Instead of a standard large dry single-plate clutch, each clutch pack for the six-speed dsg is a collection of four small wet interleaved clutch plates (similar to a motorcycle wet multi-plate clutch). Due to space constraints, the two clutch assemblies are concentric, and the shafts within the gearbox are hollow and also concentric. 4 Because the alternate clutch pack's gear-sets can be pre-selected 2 4 (predictive shifts enabled via the unloaded section of the gearbox un-powered time while shifting is avoided presentation 2 4 because the transmission of torque is simply switched from one clutch-pack to the other. 2 This means that the dsg takes only about 8 milliseconds to upshift.
Like the original six-speed dsg, it features a concentric dual wet multi-plate clutch. 13 However, this particular variant uses notably more plates — the larger outer clutch (for the odd-numbered gears) uses 10 plates, whereas the smaller inner presentation clutch (driving even-numbered gears and reverse) uses 12 plates. 13 Another notable change over the original transverse dsgs is the lubrication system 14 15 — audi now utilise two totally separate oil circuits. 13 One oil circuit, consisting.5 litres (1.65 imp gal;.98 US gal lubricates the hydraulic clutches and mechatronics with fully synthetic specialist automatic transmission fluid (atf 13 whilst the other oil circuit lubricates the gear trains and front and centre differentials with.3 litres (0.95 imp gal;.14 US gal). 13 This dual circuit lubrication is aimed at increasing overall reliability, due to eliminating cross-contamination of debris and wear particles. 13 It has a torque handling limit of up to 600 Nm (440 lbft 6 and engine power outputs of up to 330 kw (450 ps ; 440 bhp ). 6 It has a total mass, including all lubricants and the dual-mass flywheel of 141.5 kg (312 lb).
: 0AM) 7 8 9 became available. It differs from the six-speed dsg, in that it uses two single-plate dry clutches (of similar diameter). 9 This clutch pack was designed by luk clutch Systems, Gmbh. 10 This seven-speed dsg is used in smaller front-wheel-drive cars with smaller-displacement engines with lower torque outputs, 5 6 9 such as the latest Volkswagen Golf, 5 9 Volkswagen Polo mk5, 9 and the new seat ibiza. 6 It has been paired to engines with up to 250 Nm (180 lbft). 11 It has considerably less oil capacity than the six-speed DQ250; this new DQ200 uses just.7 litres (0.37 imp gal;.45 US gal) of transmission fluid. 5 In September 2010, vw launched a new seven-speed dsg built to support up to 600 Nm (440 lbft the dq500. 12 Audi longitudinal dsg edit In late 2008, an all-new seven-speed longitudinal 6 13 S tronic 13 version of the dsg transaxle went into series production (Volkswagen Group internal code: DL501, parts code prefix: 0B5). 7 Initially, from early 2009, it is only used in certain Audi cars, and only with longitudinally mounted engines.
Porsche in-house development for their Model 962 racing cars in the 1980s. In simple terms, a dsg is two separate manual gearboxes (and clutches) contained within one housing and working as one unit. 2 4, it paper was designed by, borgWarner and is licensed to the, volkswagen Group, with support. Citation needed, by using two independent clutches, 2 4 a dsg can achieve faster shift times 2 4 and eliminates the torque converter of a conventional epicyclic automatic transmission bmw use this as well. 2 Contents overview edit Transverse dsg edit At the time of launch in 2003, 2 5 it became the world's first dual-clutch transmission in a series-production car, 2 5 in the german-market Volkswagen Golf Mk4 R32, 2 5 and shortly afterwards worldwide, in the original. For the first few years of production, this original dsg transmission was only available in transversely oriented 2 front-engine, front-wheel-drive and Haldex Traction -based four-wheel-drive vehicle layouts. The first dsg transaxle that went into production for the volkswagen Group mainstream marques had six forward speeds (and one reverse) 5 6 and used wet/submerged multi-plate clutch packs 2 (Volkswagen Group internal code: DQ250, parts code prefix: 02E). 6 7 It has been paired to engines with up to 350 Nm (260 lbft) of torque. 5 6 The two-wheel-drive version weighs 93 kg (205 lb).
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This article is about the volkswagen Group dual-clutch transmissions. For dual-clutch transmissions in general, see. Schematic diagram of a dual-clutch gearbox: M: Motor, a: Primary drive and driving shaft. B: dual clutch, c: Driven shaft, d: layshaft, hollow, even gears. E: layshaft, odd gears, f: Output, a direct-shift gearbox (. German : Direkt-Schalt-Getriebe 1 commonly abbreviated to, dsg, 2 summary is an electronically controlled dual-clutch 2 multiple-shaft manual gearbox in a transaxle design, without a conventional clutch pedal and with fully automatic 2 or semi-manual control. The first actual dual-clutch transmissions were derived from.