What is DSG? From German, the abbreviation DSG stands for "direct transmission" (Direkt Schalt Getriebe). It is often called "preselective", that is, it is able to keep ready gears for the next shift.
The idea of creating such a checkpoint belongs to the French inventor Adolphe Kegresse. In the 1930s, an automotive engineer collaborated with Citroen. He proposed to install a unit with two clutches and hydromechanical control on the front-wheel drive Citroen Traction Avant. New transmission did not receive widespread use due to its complex design.
The technical consultant Volkswagen Favorite Hoff Maxim Ponomarenko spoke about the advantages and features of the box.
How DSG works
The fundamental difference between the preselective automatic transmission and the others is in two clutches that quickly change gears. In a "mechanic" or robotic box for changing gears, the clutch disc is disconnected from the flywheel, the driver or robotic computer selects the desired "speed", and after that the disc gets into place. During this time, the torque is not transmitted to the box and the car loses its dynamics.
DSG eliminates power dips. At the heart of the box is the work of two shafts located coaxially: the first is hollow, and the second is inside it. The engine is connected to each of them through its own, separate multi-plate clutch - also external and internal. On the primary, that is, the external shaft, gears of even gears (2-, 4-, 6th) are fixed, on the internal - odd ones - 1-, 3-, 5th and reverse gear.
When the car starts, a disc with an odd row is pressed against the rotating flywheel, and the disc with even "speeds" is open. During acceleration, the computing unit of the box gives the command to prepare the second gear, so that at the moment it is turned on, disconnect the disk of the odd row and immediately start up the disk of the even one. Tuned shift control ensures no loss of torque.
The robotic gearbox DSG 6 entered the Volkswagen conveyor in 2003. The dual clutch on it worked in an oil bath, receiving the name "wet". The oil in such a box takes away some of the power, increasing fuel consumption. In 2008, the German automaker introduced the seven-speed DSG 7 with a dry clutch.
DSG Benefits
- The DSG gearbox, due to the optimal modes of inclusion of the required "speeds", allows to reduce fuel consumption. Cars with it consume about 10% less fuel than cars with a conventional gearbox.
- A distinctive feature of all such transmissions is dynamic acceleration. To change the gear up, the box needs only 8 ms, it does not have the rubber traction effect of hydromechanical automatic gearboxes.
- You can drive DSG in manual mode, that is, manually change gears.
- Such an automatic transmission is 20% lighter than a similar hydromechanical transmission.
Disadvantages of DSG
- The cost of automatic transmission affects the price of a car, significantly increasing it.
- An expensive oil change (on a six-speed box) every 60 thousand kilometers. The total volume is 6.5 liters.
The preselective box is installed on different models and brands united under the name of Volkswagen: Audi TT (A1, A3, A4, S4, A5, A7, A6, Q5, R8), SEAT Ibiza (León, Altea), Škoda Octavia (Superb, Yeti), Volkswagen Polo ( Golf, Jetta, Touran, New Beetle, Passat, Passat CC, Sharan, Scirocco, Caddy).
DSG Extended Warranty
Among many car owners, the dubious glory of the double-clutch box has been entrenched. The DSG name itself has become a symbol of an unreliable design with costly repairs. In fact, Volkswagen has long since taken control of the situation. An important step towards quality control is a large-scale service campaign.
The concern gives an extended warranty for seven-speed gearboxes manufactured before January 1, 2014. According to the representatives of the auto concern, the designated date corresponds to the appearance on the conveyor of the modernized transmission without the typical problems of the previous generation. Special conditions of service are limited to 150 thousand mileage or 5 years of age of the mechanism. The service offer includes a replacement synthetic oil mineral - less aggressive towards electronic components. In this case, the firmware of the automatic gearbox control unit is updated. Found faults are eliminated free of charge - this applies to repairs, replacement of individual elements or the transmission assembly.
In any case, you should not be afraid of the abbreviation DSG: with the proper level of service, it will not let you down, and in terms of the number of advantages, the “smart robot” outperforms the classic automatic transmission. And the DSG box will require less money for repairs in comparison with a conventional "automatic".
What malfunctions are typical for DSG?
The most frequent problem- jolts when changing gears accompanying movement. The clutch discs close too sharply and the car jerks. The second known drawback is vibration at start, clanking, grinding and other extraneous noises during speed changes.
The main reason for the incorrect operation of the seven-speed transmission is its "dry" clutch. It wears out quickly due to severe operating conditions in dense city traffic, with congestion at low speeds. Therefore, the question "how to operate the DSG?" there is one obvious answer - to avoid the "gas-brake" mode, because the main enemy of the robot is a traffic jam.
Among other problems: wear on shaft bushings, clutch release forks, broken solenoid contacts, dirt on the sensors and oil in antifreeze.
How to determine a DSG malfunction when buying a used car?
- Individual gears do not turn on - the box "jumps" them.
- Gear shifting is accompanied by blows - the box "kicks".
- There is a hum when moving.
- The car vibrates at the start.
- Inspection on the lift shows oil leaking from the box.
If there is a suspicion of incorrect operation of the box, it is worth ordering an additional check, or postponing this option.
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Perhaps the most famous type of modern gearbox is the preselective robotic box gears with two clutches - DSG. Most often, this box is installed on cars of the VAG concern. The article will give answers to many questions that motorists have about this gearbox, tell about the advantages and disadvantages of the box. The article will contain real, both positive and negative reviews from the owners of cars with a DSG box.
A bit of history
The abbreviation DSG stands for Doppelkupplungsgetriebe (German) or Dual Shift Gearbox (English). On the Russian-language forums and communities of VAG car owners, you can also find the following DSG decoding: Two Clutches a Year. :))) Further, it will become clear why some decipher this way.
The DGS box currently has various designs that are very different from each other. The first version of the box was released at the end of 2002. The gearbox had six gears, the clutch was wet, the gearbox withstood a torque of up to 350 Nm and was called DQ250.
In 2008, a lightweight and economical version of the DSG, the DQ200, entered the market. The box is seven-speed, the clutch is dry, but the box no longer pulls a lot of torque, it is limited to 250 Nm.
The first and second versions of the boxes were developed by the VAG concern together with the companies LuK and Borg Warner. In the fall of 2009, VAG developed and produced a seven-speed gearbox with double clutch already independently. The box was called DQ500, withstood a torque of up to 600 Nm and, thanks to this, could already be used on commercial vehicles. Another modification of the DSG family can be counted DL501 or "S-Tronic", which is also designed for a torque of up to 600 Nm and is installed mainly on Audi, but only on cars with a longitudinal engine. This is a joint development of Audi and Borg Warner 2008.
"I own the sixth Passat with DSG, I can immediately say that the car is cool. I have been driving it for more than ten years, and I think that the box here is simply unbreakable, although to be honest, those configurations of the trade winds that are sold with us are not worth the money. As for the DSG boxes, I want to add that during the time that they began to be installed, the manufacturer has significantly modified it. And if someone has problems with DSG, it does not mean that everyone will have them. the Japanese use robotic gearboxes - Nissan and Toyota. My parents Camry has been with a robot for over five years and has been using the car every day. For five years, no problem. "
How DSG works
At its core, DGS is - manual gearbox, but the gear change itself takes place by a robot and without loss of power, and not as in conventional "mechanics". In the manual transmission, power is lost precisely at the moment the clutch is depressed, and it is clear that at the moment the torque is taken away from the wheels, the fuel burns out. In general, the use of DSG should add dynamics and economy to the car.
"I have two cars. On one there is a seven-stage DSG, on the second - six. I really like how DSG works. But it's worth saying that you need to get used to it. The box is adaptive, which means it adjusts to your driving mode. It can work abruptly. and smoothly, you don't have to think that this is a malfunction. The box needs time to adapt. I like such boxes more than conventional automatic transmissions. I have already rolled over 50 thousand. There are no problems with the checkpoint. "
The main difference between DSG and any gearbox is the presence of two clutches. But, in fact, it is still more confusing. There are also two boxes! And they are so integrated into one common body that it is not striking. And if the car uses two gearboxes, then the input shaft cannot be one. So it is - there are two shafts, and each has its own clutch. Now it is clear why a dual-mass flywheel is needed in the DSG.
One shaft is equipped with gears for odd and reverse gear, and the second, respectively, for even. After starting the car in first gear, DSG has already turned on second, and keeps it ready. And when the car needs to shift to the next gear, the clutch of the first shaft opens, and the second clutch quickly picks up the moment without losing power, and so on.
"I bought a Passat 1.8 TSI with 7-DSG. I bought a new one in the cabin. I have already passed 30 thousand, there is no problem. I want to note the amazing handling of the car, which allows it to easily maneuver on the road, including in traffic jams. With a set of speed, the steering wheel becomes firmer. , which gives additional control over the car.Although the car is not a racing car, but from time to time I like to fire on the roundabout.However, when entering corners at a speed of more than 100 km / h there is a feeling that the rear axle is blown away. but there I myself overestimated the butt. I'll try to change the tires, maybe it's because of it it blows so much. But, as for the box itself, the car accelerates just gorgeous, the dynamics are at a height. Up to a hundred - 9 seconds. In D mode, the box switches transmission, as if the seeds are clicking, after all, the dual clutch allows you to keep two speeds on at the same time. sport mode, and push the sneaker into the floor, then up to 190 km / h you can walk oh how quickly. Personally, I get to squeeze 210 km / h. In short, I have no complaints about the box. Works great."
The DSG gears are engaged with conventional synchronizer couplings, and the forks drive the hydraulic cylinders, and the clutch is also engaged and disengaged using hydraulics. All these processes are controlled by the same notorious "mechatronic", which contains in its module the main electronics and electrohydraulics of this gearbox.
The shaft of even gears of this gearbox is hollow. Assembled inside it is the shaft of odd gears. With such a trick, it was possible to fit two manual transmissions into one case.
DSG reliability
Unlike the classic automatic transmission, which does not need a clutch or a powerful flywheel, DSG uses both of these components. Moreover, the flywheel needs a dual-mass and with a good margin of safety, like a manual transmission (at least 150 thousand km). But in practice, a DSG flywheel can fail much faster.
"The seventh DSG is the most real awl. Not only mechatronics, but also the clutch flashed through me. And, judging by the forums, I am not the only one. A familiar master at the service station said that at least one Audi, Volkswagen or Toyota with problems of the same box - now mechatron, then clutch. And always this repair costs just unrealistic money. But what to say - google on request "mechatronic for DSG" and everything will become clear. But with DSG-6 things are different. I had a Golf with the sixth DSG, which did not recommend itself as anything bad, so I was not afraid to buy a car with such a box, but a seven-step, which I regretted now. I had no problems with Golf for 5 years. I will give advice to those who want to buy a car - do not buy cars with 7-DSG. "
The wet clutch type of DSG cools better, which is why it has a longer resource - about 300 thousand km. But the resource of the dry clutch is declared at 150-200 thousand km. But again, a dry clutch in practice does not cure as much, and the reason lies in the gearbox control system - mechatronics. In it, even before the run of 100 thousand, the solenoid valves are usually damaged. And the thing is that the mechatronics is located on the top of the gearbox unit, which heats up as much as the gearbox itself. To understand that the box heats up very much, suffice it to say that its design for a reason provides for the presence of a separate water-oil radiator (heat exchanger). You can imagine what temperature changes a mechatronics technician experiences in a car that first spent the night on the street in a twenty-degree frost, and then drove along the highway at a decent speed, or even worse - began to "crawl" in a traffic jam.
As you know, demand creates supply, and today there are many services that offer mechatronics repair. The official dealer does not do this, and offers full replacement Checkpoint. It is worth noting that DSG cannot be repaired in a regular garage - special tools are needed to ensure that the assembly accuracy is up to five microns.
Consider the options for DSG boxes
DQ 250 (DSG-6)
The gearbox has six gears and can withstand a torque of up to 350 Nm. The clutch at the box is wet. The box is often referred to as DSG-6. The box needs regular maintenance every 60 thousand km, which consists in changing the oil and filter. If the oil is not changed, then the mechatronics quickly fails.
This is the first generation of DGS boxes used on VW vehicles: Golf 5 1.4 FSI and diesel 1.9 and 2.0 TDI; Touran, Passat B6 with 2.0 TDI diesel units ; Skoda Octavia of the second generation with a two-liter turbocharged diesel engine; and Seat Leon with the same diesel unit... The box is not without flaws, but over the past more than 10 years, car owners have managed to eliminate many problems. DSG-6 has proven itself well.
DQ 200 (DSG-7)
Seven-speed gearbox designed for torque up to 250Nm. The box has a dry clutch, the manufacturer does not provide for routine Maintenance DQ200. Many car services still advise making regular fluid changes in the gearbox oil circuits. Most of the complaints from car owners are about this box.
Since the box is not designed for serious torque, it was installed on medium-power 1.4, 1.6 models, maximum on 1.8-liter engines, mainly with a turbine.
The box had design features, for example, pump her hydraulic system connected on demand from an electric motor. This allowed the car to be more fuel efficient at low loads.
It would seem - an excellent gearbox, lightweight, economical, dry clutch from LuK is designed for 300 thousand kilometers, there is no need to service the box. Ride and rejoice! But ... About these "but" will be written below. In the meantime, we will continue to introduce the types of boxes.
DQ 500 and DL 501
Serious "korobas" for a serious moment - 600 Nm. It was installed mainly on expensive and powerful Audi, VW minibuses, although it is also found on two-liter turbocharged Tiguan... The clutch is wet, there are seven gears.
Typical problems DSG
Now let's look at those "buts" mentioned above. For many, it all began with a slight grinding, clanking, bumps, sometimes when driving through irregularities, sometimes out of the blue with measured driving. After contacting the dealer, he diagnosed the checkpoint, which did not reveal any errors, and in the absence of vibration and jerks, the client was usually denied repair. VW urged that such "minor" faults be considered normal.
But there were even more complaints about cases of pushing, vibration and tremors when changing gears from 1st to 2nd and just when driving at low speed. If the problem was not treated, then over time it grew: the strength of the vibrations increased, the clutch began to slip. Even odd or even transmissions could be missing. Gears returned after replacing the clutch discs.
If the gearbox hydraulics are overheated, then the gears begin to engage in jerks, as if hinting to the driver that they say, "change the intensity of switching, move more evenly." Such problems most often arise in traffic jams, where the driving style is appropriate: start-stop, start-stop. With such a ride, the hydraulics in the box heats up quite strongly, and the clutch is under increased stress.
Some car enthusiasts complained that the gearbox, in an insidious way, fundamentally did not want to engage gears. None. Moreover, this could happen in motion. Sometimes restarting the car solved the problem, if this did not help, the mechatronics had to be repaired or changed.
"I drive Foltz Passat 6 with automatic DSG. Everything was great for a long time, there were no complaints about the box, but as soon as I decided to sell the car, it started. The checkpoint flew, and, strangely, out of the blue. I drove about 50 km / h, and that's it. - the box simply refused to change gears. I had to call a tow truck. At the service station some kind of “mechatronic” was sentenced. According to experts, it burned down due to the fact that oil somehow got into it. I just went nuts, but what could I do. After that I talked with other owners of such cars. Everyone is aware of this problem, and it occurs quite often. But I didn't know, and I didn't have time to sell the car. Conclusion - the box needs serious revision. . It's too early to put it on cars. "
Further, the manufacturer discovered an unpleasant feature of the synthetic oil used in DSG: in a warm environment, the oil began to interact with the copper parts of the block, sometimes causing a short circuit. After that, the clutch stopped engaging. Many owners rushed to change the oil for "mineral water", but, alas, the problem could not be completely solved, and this oil does not correspond to the climatic conditions of Russia.
Some car owners have changed who the mechatronics, and who the whole box under warranty. But this did not give carte blanche for the future - there were many cases when the same problems arose on the changed boxes. Opening the "dead" boxes revealed the presence of shavings, which were formed, most likely, due to improper operation of the gearbox control unit.
Answers to frequently asked questions about DSG can be found
It is worth remembering that 7-DSGs are virtually non-repairable. Repair of the box on third-party services is carried out at your own peril and risk and without any guarantees. Even the oil in it in a garage is almost impossible to change.
How to determine that your DSG has a mechatronic failure:
The box went into N mode, and on dashboard you see the indication "PRNDS";
The first gear is now included very hard;
In the same way, the switching between gears 1-2-3 occurs rigidly, sometimes clear clicks are heard at these moments;
When braking in second gear, vibration is clearly felt;
At rpm below 2 thousand, there was a feeling that the thrust was gone.
In many non-warranty cases, it is worth thinking about the expediency of buying new box- its cost can be equal to the cost of an average car for secondary market.
What is the percentage of DSG breakdowns? And no one really says. The official statistics are as follows: during the warranty period, about 5% of car owners apply to replace DSGs. How true this is is unknown. One thing is known - if you have such a box, this does not mean that it will completely fail. Most cars still drive without DRG problems.
“I can say for sure - if you don’t know how to use DSG, then you don’t have to lie. I have a Passat with a DSG-6, I have been driving it for almost 7 years. The box does not cause any problems. I change the oil on time and that’s all. when changing the oil, I thought - to pour the original, or take a cheaper substitute. I did not take risks and filled in the original. I saw dirt and shavings in the box when changing the oil. By that time, the machine had started to undermine and twitch a little. I thought that if the oil change did not help, After changing the oil, all the problems disappeared! Everything began to work like on a new car. But my godfather decided to save money and bought a non-original oil. I drove for a week, and the car began to stoke. As a result, I got to replace the checkpoint at the dealer. Besides the fact that I dumped a bunch of dough, I also had to wait a month. So don’t pour any Mr.
Summing up the complaints of the owners of cars with DSG, we can conclude: the DSG box does not tolerate a driving mode with constant operation of the clutch system and frequent gear changes. Constant driving in traffic jams is a typical example. Such a ride overheats the box, wears out the clutches and breaks the mechatronics. But, for driving in a traffic jam, the names of such or a classic automatic transmission are preferable. Pulling a "poker" in a traffic jam is terribly inconvenient, so residents of megalopolises buy cars with DSG for a comfortable ride. But it was not there...
Further, it is important to keep in mind that DSG is not for "racers"! She does not like sports driving, and the method of cranking the engine with a depressed brake pedal for a further sharp break from a place can kill a DSG with a dry clutch literally from one such start.
In general, the problems of DSG lie in complex technologies, and a good fellow Volkswagen, which develops and improves the topic of fast and at the same time smooth ride, being, in fact, a leader in this area. And environmentalists put some pressure on these developments - after all, a conventional automatic transmission consumes more fuel, which means that such cars have more emissions into the atmosphere.
So all the same - to buy or not a car with a DSG box? Why not? But it is advisable to take a car from VW no older than 2012 or with a DQ250 box. After all, you need to understand that other cars have problems with a different type of gearbox. What is, for example, the French DP0 / DP2 machine gun. Yes, DSG has a higher percentage of failure, but it is not equal to one hundred. And much depends on the operation and timely maintenance. I would like to believe that the latest upgrades of this type of gearbox have fixed many typical jambs, and now there will be much less problems with the boxes. But if you are still a true connoisseur of durability and reliability, then “you don’t need such a box, brother”. Look for something really simple - a simple manual transmission, simple vehicle equipment, less bells and whistles and electronics in the car, because the simpler the mechanism, the less chance of breakdowns. This rule applies to everything, not just cars.
But the author of the article still hopes that the problems with the new DSGs are in the past, and if not, then another couple of years, and VAG will "polish" given type gearbox to optimum condition. And other manufacturers will also begin to equip their cars with such gearboxes. It's still pretty damn nice to drive a car with DSG!
To collect information about the operation of the DSG box, its breakdowns and malfunctions, leave your feedback and share your experience. Descendants will be grateful to you.
The most famous representative of the new generation of automatic transmissions is the DSG gearbox. In particular, its installation on German-made Volkswagen cars made these vehicles popular among consumers. If you don't know what Volkswagen is, you can read reviews about these boxes on our website. After reading the material, you will learn the advantages of these checkpoints and the nuances that every car owner may encounter.
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Main characteristics
On light vehicles, the DSG gearbox "migrated" from "Formula 1" and they were the first to be installed on german cars Volkswagen. Initially, a robotic gearbox with two clutches represented the usual improved "mechanics". But this mechanical box had two primary and two output shafts, and each of them was connected to the engine through a personal multi-plate clutch.
What is the principle of such checkpoints? When the first speed is turned on, the clutch, which acts as a synchronizer in the manual transmission, locks the speed gear on the driven pulley. At this time, the clutch is closed and the torque is transmitted through the inner pulley to the wheels. Switching on the speed, the DSG unit immediately locks the second stage gears electronically.
Video from Alexander Kozakov "Warming up VW Passat 2.0"
This video shows the process of warming up a VW Passat equipped with DSG 6 at a temperature of 18.5 degrees Celsius below zero.
When shifting to second speed, the discs of the first clutch as indicated on-board computer open and close the second clutch. At this time, torque begins to be transmitted through the primary pulley and two second speed gears. Thus, the vehicle is accelerated. When the gearbox speed is reset, the DSG operates in the reverse order.
All DSG operations are controlled by an electronic unit, which determines the order of operation of all elements of the transmission system based on the position of the gas pedal. It is also worth noting that the use of a DSG box with a so-called wet clutch assumes the functioning of the discs in an oil reservoir.
There can be two variants of DSG: DSG 7 and DSG 6 with "dry" and "wet" clutch, respectively. Both gearbox options are used in parallel. DSG 6 is a more robust transmission option as it can handle more torque. Therefore, such gearboxes are installed on more powerful vehicles. As for DSG 7, less powerful cars are equipped with such boxes.
For the first time DSG 6 appeared in 2003 and it worked on a "wet" clutch, ie. in the oil reservoir. The main disadvantage of such a box is the loss of power due to oil. Therefore, five years later, the German auto concern Volkswagen presented to consumers a new version of the gearbox - DSG 7, which used a dry clutch.
Advantages of vehicles equipped with DSG:
- the speed of switching one gear is about 8 ms, which allows for dynamic acceleration of the car;
- depending on the driver's preferences, you can automatic mode control switching or independently;
- the efficiency of using gasoline increases (by an average of 10%).
As for the shortcomings, it is immediately worth noting that there are not so many of them and, as a rule, they do not appear on all Volkswagen car owners. In general, it all depends solely on vehicle, therefore, it is impossible to clearly distinguish certain symptoms of the "disease". However, even these minor disadvantages will not be able to outweigh the advantages, in particular the fuel economy and smooth gear changes. As for the working resource of the gearbox, it is quite high, which is why some automakers increase the warranty on DSG to 7-8 years.
Reviews
We invite you to read the reviews of the owners of cars operating on the DSG gearbox.
In general, the DSG automatic transmission can be said to be a reliable unit, the service life of which depends on correct operation. In practice, cars with such checkpoints behave confidently and dynamically on the road: not only in traffic jams or in heavy traffic, but also when maneuvering on the highway.
Judging by the reviews Volkswagen owners The most common diseases on these cars are mechatronics and clutch breakdowns. According to experts, they arise as a result of not correct operation boxes. In particular, we are talking about transmission fluid uploaded to DSG: it must be original. The moment the box warms up in the winter is also important: to increase the service life, it is advisable not to start abruptly at the start of the movement. Of course, for some it will be difficult to refrain from driving fast, because the "automatic" allows, but it is better to do this when the car has warmed up to the desired temperature.
Video "Everything about the DSG 7 gearbox"
After watching this video, you will find out what a DSG-7 robotic gearbox is and what is the principle of its operation.
Did you like this article? What do you know about robotic checkpoints? Share your knowledge with our users!
The DSG transmission combines a manual and an automatic transmission. The bottom line is that the driver switches gears manually, and the process itself is performed by means of electronics and automatic mechanisms. This transmission was first mass produced. by Volkswagen AG.
DSG design
Automatic DSG works as follows. On the basis of one axis there are two intermediate shafts, one of which is hollow and passes the other through itself. The gears and the outer shaft are connected to two output shafts, on which pairs of gears of all odd and reverse gears are installed. The transmission is activated by means of a synchronizer and a clutch. The whole process is electronically controlled by a hydraulic booster.
From a technical point of view DSG gearbox is an improved version of the manual gearbox, it contains many of its components: primary and secondary shaft, clutch, synchronizers. In all other respects, the differences begin. The robotic transmission eliminates the need for the driver to depress the clutch pedal mechanically. This work is performed by the electronics, which, taking into account the selected mode, independently connects the gears.
Features of the DSG gearbox
The DSG has five shafts, which, in combination with gears and two clutches, form a dual-circuit mechanism that provides torque transmission. Thereby vehicles with this gearbox pick up speed faster than cars with mechanical transmission... Gear shifting is no different from modern automatic transmissions, which is why DSG has long been used in sports cars, where speed is of great importance. In addition, this transmission provides the ability to shift gears manually - using the Tiptronic system or a manipulator on the steering wheel.
Two multi-plate clutches provide torque transmission. When one of them is closed and one gear is working, the gears of the other are already in engagement, you only need to close the second clutch. Upon receiving a command from the control panel, the mechanism instantly disengages one clutch and closes the second, while simultaneously activating the other gear.
DSG box advantages
First of all, transmission minimizes acceleration times and saves fuel, which is very relevant today. During operation, the shifts are imperceptible, as a result of which there is a feeling that the car is driving in only one gear. There are only two pedals in the cabin - gas and brake. It's enough. The transmission selector is the same as that of automatic boxes gear. And if you don't like something, you can always control the transmission manually by moving the lever up or down. The use of a robotic box reduces fuel consumption. Car enthusiasts note that the savings reach twenty percent in comparison with similar models equipped with an automatic transmission.
The video shows the assembly of the DSG gearbox:
A definite plus is the switching speed and acceleration dynamics. Cars on which such a box is installed accelerate faster than their counterparts equipped with mechanics. At the same time, the power remains at the same level. DSG is a reliable unit and, if used correctly, will last a long time. But the repair of this gearbox is impossible. While it is possible, this problem will be resolved soon.
Disadvantages of DSG
Among the disadvantages of the transmission are the following:
- equipped with such a gearbox increases significantly due to the technical complexity of the equipment.
- When accelerating and shifting gears, slight jerking of the machine is noted.
- Sharp acceleration causes slight delays - the box does not have time to jump over the gear.
- Control units wear out quickly, resulting in the need for premature repairs.
All these shortcomings can be considered subjective. When the number of cars with such boxes increases, their cost will decrease, and there will be ones capable of servicing it. As a result, the price will also decrease. It can be assumed that over time DSG transmission completely displace mechanical box speeds.
In the video, the principle of operation of the DSG gearbox:
Which cars is DSG used on
Today, a robotic gearbox is installed on cars of the following brands:
- Volkswagen (Golf, Sharan, Eos, Touran, Beetle "Beetle", Bora,);
- (Superb, Octavia);
- Audi (A3, Q3, TT);
- Seat (Toledo, Alhambra).
It is used on models whose engine torque does not exceed 350 Nm.
A 7-speed gearbox is used on these machines:
- Volkswagen (Golf, Passat, Sharan, Transporter, Caddy, Jetta, Touran, Beetle "Beetle", Bora, Tiguan);
- Skoda (Fabia, Superb, Octavia);
- Seat (Ibiza, Leon, Altea);
- Audi (A3, Q3, TT).
Manufacturers install it only on machines equipped with a torque of up to 250 Nm.
I decided to talk about one of the most popular automatic transmissions DSG, which is equipped with a large number of cars, mainly made in Germany. You will learn about how DSG works and its strengths and weaknesses... Interesting, let's go then!
So let's start with what is DSG? This abbreviation stands for: " Direkt Schalt Getriebe "and translated from German" direct gearbox "or" direct gearbox. "Quite often, next to the DSG, you can find the prefix" overselective ", which in" human language "means that the box is constantly preparing the next gear for switching.
The French engineer-inventor Adolphe Kegresse invented the DSG box in the 30s of the last century. At that time, Adolf collaborated with which, in fact, it was proposed to integrate a completely new gearbox with two clutches and hydromechanical control. Citroen Traction Avant was chosen as a test subject. However, the box did not become mass-produced due to its complexity and high cost.
DSG: how does it work?
The main difference between the preselective gearbox and the classic counterparts is the use of two clutches, as well as the speed of gear shifting. On mechanical, as well as robotic gearboxes, to change gear, the clutch disc is disconnected from, after which either the driver or the robot (in the case of robotic gearbox) selects the required gear. Then it returns the clutch disc to its place. All these manipulations in one way or another are associated with the loss of dynamics, since during them it is not transmitted from the motor to the box.
As you might have guessed, the DSG delivers shifting without sacrificing dynamics and power through the use of two coaxially positioned shafts. The first shaft is hollow and the second shaft is located inside it. The motor is connected to each of the shafts by means of a separate multi-plate clutch, external and internal, respectively. On the external (primary) shaft there are gears of even gears (2, 4, 6), on the internal (secondary) - odd gears (1, 3, 5, as well as reverse).
At the beginning of the movement, when the car starts from a standstill, the disc with odd gears is pressed against the rotating flywheel, while the secondary disc, on which the even gears are located, is in the open state. When the car starts to accelerate, a special computing unit "DSG" gives the command to prepare the second speed, so that when it is turned on, immediately disconnect the drive of the odd row and at the same time connect the drive with even gears. This "rehearsed" control of gears and shafts allows shifting in seconds without losing torque.
The DSG 6 robotic gearbox was launched into serial production in 2003 by Volkswagen. Due to the fact that this box was located in an oil bath, they began to call it "wet". Unlike the "dry" analogue, in boxes with a wet clutch, part of the engine power is spent on oil, which prevents rotation, and also increases fuel consumption. Five years later, the Germans presented a modified seven-speed DSG 7, which already used a dry clutch.
Pros of DSG
- Thanks to "smart" gear shifting, as well as correctly configured switching modes, the DSG box allows (+ -10%).
- Excellent dynamics due to instant gear change, the DSG spends some 8 ms to increase the gear.
- DSG allows you to use it in manual mode, that is, something like that.
- The weight of such a box is 20% less compared to the one equipped with a valve body.
Disadvantages of DSG
- Price. Cars with DSG are more expensive compared to similar models without this box.
- Changing the oil in the "DSG" box is not cheap, because it requires special oil in the amount of 6.5 liters. In addition, the replacement itself is regulated after every 60 thousand km. mileage.
- Expensive renovation. It will not be cheap to fix a faulty DSG; moreover, not all service stations undertake such work. The reason lies in the complexity of the design and the unprofitability of the repair itself, since it takes a lot of time and effort.
- Delays in gear changes. Despite the fact that I spoke above about instantaneous switching, there are also delays on DSG. This happens at the moment when, during smooth acceleration, the driver sharply presses on the gas to accelerate faster. At this moment, there is a delay, "stupid" for the reason that the computing unit prepared a higher gear, but at the last moment the driver sharply pressed the gas and in order to give a sharp increase in power, it is necessary not to increase, but to lower the gear. The result is a slight delay, followed by a sharp jerk and acceleration.
The reselective "DSG robot" is installed on a large number of car brands that belong to the German concern Volkswagen, among them: Škoda, Audi, SEAT, and, of course, Volkswagen itself.
DSG myths
Among motorists there are various rumors about this box, some like it very much, while others are afraid of it "like the devil of incense" and do not buy this or that model of car just because it is equipped with a DSG transselective robot. I will not go into details and talk about who is right and who is not, I will only say that earlier modifications of this box could really cause a lot of trouble, especially in the secondary market. However, after serious revision of the sixth generation DSG, this box has ceased to be associated with unreliability and expensive repairs. The fact is that Volkswagen itself went to meet customers, and in order to prove the reliability of its boxes, it extended the warranty on them.
The main malfunctions of "DSG".
- One of the most common problems is jolting during gear changes, which jerks the car forward. This happens due to too sharp closing of the discs, due to which the machine jerks.
- The second most popular problem is vibration when starting off, as well as extraneous sounds when changing gears.
Also found on DSG robots: jerks when shifting (box kicks); the box hums while driving; some programs are not included; strong vibration when starting off.
As a rule, the incorrect operation of a seven-speed DSG consists in a "dry" clutch. Constant loads lead to rapid wear of the working parts. The main wear occurs during long "haul" when the car is moving slowly. To prolong the life of the DSG, frequent gas-brake combinations should be avoided whenever possible.
Finally...
In general, like any other mechanism, subject to the rules of operation, the DSG robotic box will not cause any trouble. The dual-clutch transmission has many advantages over a conventional automatic transmission, which have already been appreciated by millions of happy car owners.
