How Does A DSG Gearbox Work

Here you can get A Direct-Shift Gearbox Working. A direct-shift gearbox commonly abbreviated to DSG is an electronically-controlled, dual-clutch multiple-shaft, automatic gearbox, in either a transaxle or traditional transmission layout (depending on engine/drive configuration), with automated clutch operation, and with fully-automati or semi-manual gear selection.

A DSG (directshift gearbox) is a type of automatic gearbox with two clutches, which few other automatics have. While most cars come with one clutch, the second one works out which gear you’re likely to want next and gets it ready.

Working of a DSG Box

A DSG, or dual-clutch gearbox is, in simplistic terms, a manual transmission with two clutch packs to control odd and even gears. Inside the car the driver only sees a brake and a throttle with the gear selection via the dual clutches, one controlling odd gears (one, three, five and reverse, for example) and the other one controlling even gears (two, four, and six).

The gear change is based on engine speed, wheel speed, brake application, throttle position and hydraulic actuators which, depending on the information gleaned by the sensors, will be commanded to select either a higher or lower gear.

If you pull apart a dual-clutch transmission, you’ll see the ‘drive’ shafts are sleeved, meaning that the shaft that holds one set of gears (odd or even) sits inside the other one, and that once together it ends up looking like a single drive shaft; almost like you’ve upturned two glasses and stacked one on top of the other. Almost, but you get the idea. Similarly, one of the clutches sits inside the other, the inner clutch activates the outer drive shaft, and the outer clutch activates the inner drive shaft.

Just like a manual or automatic transmission, a DSG has different sized gears, with the largest gear providing drive to the lowest gear, so, first gear. As Robert’s explanation of an automatic transmission describes HERE, the big gear in the transmission meshes with a smaller gear connected to the engine and so no matter how hard it’s revved the car will only drive slowly.

There are two gear selectors which straddle the gear sets and one will control gears going up, and the other one controls the gears going down. These selectors have magnetic position sensors on them to tell the ‘mechatronics unit’ in VW speak what gear has been selected, with pistons controlling the selectors’ movement.

What Is Direct Shift Gearbox

A DSG (direct-shift gearbox) is a type of automatic gearbox with two clutches, which few different automatics have. While most cars include one clutch, the second works out which gear you’re probably to need next and gets it ready.

In theory, because of this the gearbox is always organized on your subsequent move, so the gear shifts are particularly short and smooth. It’s once in a while additionally known as a dual-clutch gearbox, twin-clutch or DCT, although some manufacturers have their own name for it.

What are the problems with DSG gearboxes?

No mechanical system is 100 per cent bulletproof, but as manufacturers increasingly use DSG transmissions it’d appear that their failure charge could be very low. On a few older models owners have reported faults with DSGs along with noisy bearings or juddering from the transmission however those are usually few and a long way between.

As DSGs are fully automated they’re actually far less open to abuse than a traditional manual. In a everyday guide the gears should be ‘crunched’ by an unsympathetic driving force or the grasp should put on out upfront if not operated correctly. 

How to drive a DSG gearbox car

Many people choose automatic gearboxes due to the fact they make driving easier, particularly in traffic; you don’t have to fear about constantly using the grab together along with your left foot. Driving a car with a DSG gearbox isn’t truly any special to using maximum different automatics – you’ll want to positioned your foot at the brake to interchange among neutral, park, opposite or force.

Releasing the brake withinside the opposite or force will imply the automobile begins offevolved creeping backwards or forwards respectively – that is deliberate, because it makes low-pace manoeuvring easier. Park need to be used whilst you are leaving the car as it locks the transmission, however you’ll nonetheless want to use the handbrake.

Advantages

  • No loss of torque through the transmission from the engine to the driving wheels during up-shifts.
  • Short up-shift time of 8 milliseconds when shifting to a gear the alternate gear shaft has preselected.
  • Smooth gear-shift operations.
  • Consistent down-shift time of 600 milliseconds, regardless of throttle or operational mode.

Disadvantages

  • The clutch pack mechanisms have a limited lifespan.
  • Expensive specialist transmission fluids/lubricants with dedicated additives are required, which need regular changes.
  • Relatively lengthy shift time when shifting to a gear ratio which the transmission control unit did not anticipate (around 1100 ms, depending on the situation).
  • Torque handling capability constraints impose a limit on after-market engine tuning modifications (though many tuners and users may exceed the official torque limits notwithstanding); (Later variants have been fitted to more powerful cars, such as the 300 bhp/350 Nm VW R36 and the 272 bhp/350 Nm Audi TTS.)

Leave a Reply

Scroll to top