Elimination of slip of an automatic transmission. Slipping of an automatic transmission: causes and elimination of problems How much do you need to slip to burn an automatic transmission

Slipping of driving wheels in snow, mud can have a detrimental effect on the resource automatic box gear. Let's see if it is possible to slip on the machine without harming the transmission. Be sure to consider the features of off-road driving on a car with a torque converter type automatic transmission, a variator and a robotic gearbox (DSG, Power Shift).

Automatic transmission and off-road

In view of the greatest distribution, the question: is it possible to slip on the machine, most often arises among the owners of a car with an automatic transmission of a torque converter type. What consequences can you expect if you slip in snow, mud and drive off-road without following the recommendations?

Automatic gearbox operation at the time of slipping

In situations where the drive wheels are slipping in mud or snow, shifting is the greatest danger to the automatic transmission. The electronic gearbox control modifies the gear ratios based on speed and engine load. The ECU focuses exclusively on (DPDZ, DMRV, gas pedal position sensor, speed sensor). Therefore, when the wheels slip, the ECU “thinks” that the car is accelerating normally and engages an overdrive.

It is the gear change when slipping leads to increased loads on the torque converter and clutch packs. A similar damage to automatic transmissions is caused by a sharp change in the coefficient of adhesion to the road at the time of slipping of the driving axle. For example, when a car slips in the snow, and then the wheels suddenly hit an asphalt area with good grip.

Overheating is no less dangerous for the box. The difference in the angular speeds of the turbine and pump wheels of the torque converter leads to intensive heating of the working fluid. If the car slips in mud or snow until the moment of forced blocking of the main engine, the volume of oil circulating through the torque converter increases, which leads to an increase in temperature. With excessive heating, the oil cokes in the valve body channels and loses its performance. Therefore, frequent off-road use of a car requires reduction.

How to ride correctly?

Cars with DSG and CVTs

As you understand, it is possible to slip on the machine without harm to the transmission. Perhaps this is due to the principle of the torque converter. When slipping, the main engine smooths out shock loads. If it assumes the presence of a torque converter, then the car will tolerate trips on light off-road much more calmly. But at the same time, it is possible to slip only until the main engine is blocked. In general, operate the gas pedal carefully to minimize the increased stress on the belt and variator cones.

The disadvantage is just the lack of a torque converter. Therefore, the clutch packs used in "wet" DSGs, as well as the clutch discs of "dry" robotic gearboxes on the off-road experience increased loads.

Car enthusiasts should remember that a car with an automatic transmission requires close attention and knowledge of control rules, especially in critical situations. If it's winter outside and you run the risk of falling into a snow trap, heed the advice of experts on how to behave in cases of snow jams. To say unequivocally - you cannot slip on an automatic transmission - it is not entirely true, there is always a way out.

Box cooling

Heat during automatic transmission is emitted by both friction discs and a torque converter, under heavy loads, overheating is extremely high, for this, a powerful cooling means is provided in cars with an automatic transmission. The radiator is built into the engine cooling radiator as an element, or it is cooled using a separate air flow.

With long skidding, the temperature of the lubricant of the machine box rises sharply, up to its boiling. This leads to the destruction of the friction discs, forced to work "hard". And in the worst case, it can lead to a breakdown in the transmission.

Conclusion 1. It is permissible to slip on the automatic transmission, but not for long and intermittently.

Slipping on a hot car

If you start to slip on a "cold" machine, the lubricant will not warm up enough, which will also lead to hard work of the box elements and their rapid wear. Switch on the "R" mode in advance and warm up the car for up to a minute. The grease will be brought into working condition, after which you can start slipping.

Conclusion 2. We warm the car before slipping.

Fixing transmission

During slipping, the torque converter receives the greatest load, which is fraught with its removal from working condition. At high temperatures, the properties of the liquid oil change, pressure may drop, which can lead to burnout of the friction discs. Try to clearly fix the gear without changing its position in the process of slipping. Switch from mode "R" to "D" necessarily through the brake pedal.

Road grip

The clutches wear out under any serious load, be it towing, slipping or excessive driving speed. The automatic transmission has a special element - a differential gearbox with a long axis running along its body. If the wheel hits a hard surface, a very strong blow to the axle is possible, which can pull it out with further breakdown of the box body.

Conclusion 4. Do not allow a sharp traction immediately after slipping.

When not to slip

Do not try to slip on the machine if your car belongs to the old monsters of the last century. Cars with high mileage suffer from severe wear of the torque converter. The box cooling radiator becomes clogged over time, which requires immediate replacement of the automatic transmission. If you are the owner of such a car, and are not ready to abandon your beloved friend, try not to drive into strong snow drifts on long routes.

If your car is "Japanese" or "European" of the old model, an air cooling system of an automatic transmission can be built into it, while auxiliary outer blades are installed on the surface of the torque converter, which circulate air to remove the temperature. These automatic transmissions can be cooled only during movement, so slipping on them is contraindicated.

Conclusion 5. Modern car models of Japanese and European manufacturers with automatic transmission do not suffer from this drawback, they will get you out of the snowdrifts without any problems.

For a real car enthusiast or an experienced professional, there are no unsolvable road problems. The main thing is to know your car as if it were your own, and listen to the advice of wise men from driving.

Video: how to use automatic transmission correctly

Well, what are my curious, we begin to disassemble the machine in extreme situations, but "slipping" is precisely an abnormal position in the automatic transmission. There are a lot of rumors and fables about this topic that it is impossible to slip at all, this is almost immediately the death of the transmission, that you can do this without fear. Where is the truth? After all, you can get stuck not only in winter, but also, say, in the mud when traveling to the country, and it is easy and simple! But what about all-wheel drive cars, because many of them also have an automatic transmission? Read on, we take it apart ...

I have already spoken many times about automatic transmission, and that there are several types of them:

• Classic torque converter automatic
• Variable speed drive
• Robot

They are different in their structure and characteristics, many useful information... But it so happened that one of the most common now is the automatic, the classic torque converter. It occupies about half of the market (even a little more), the rest is divided by the variator and the robot. The main questions are connected with it.

What you need to remember about automatic transmission

Guys, I have said many times and now I repeat, an automatic transmission is created for only one. FOR COMFORTABLE URBAN RIDING, on well-cleared roads. It is not suitable for off-road applications, for dealing with snow drifts and mud. Any of yours through dimensional "slipping" affects the resource of the machine negatively! It just needs to be remembered for granted!

If we cannot do anything with you in winter, well, this is our climate. That is to deliberately climb into the mud and "fight off-road", for me it is beyond understanding. Of course, now there are luxury SUVs, and with automatic machines, but I really don't want to get into the mud on them, because they are very expensive. And they are also not designed for this, even if there are a bunch of all kinds of locks and "electronic assistants". If you got up in a very difficult "swamp" and have been skidding for several tens of minutes, a badge with automatic transmission overheating will appear on your car display. He can forcefully shut off your transmission and you won't do anything about it. All this is done so that you do not "ditch" it right here (although about four-wheel drive will be slightly lower).

Remember the golden rule - if you like to drive through the mud, then this is definitely a mechanic. There you will burn the clutch as much as possible, but this repair will be much cheaper than restoring the automatic transmission later.

So machines (in large application), this is an urban transmission, I emphasize once again, created for the city, well, the maximum for victory over a snow-covered yard, but no more.

An automatic transmission is a very complex unit, here it is transmitted from the engine using pressure (or, scientifically, using friction) fluid. Read about the automatic transmission clutch. In short, two discs directed at each other, enclosed in a torque converter, transmit torque from the engine to the transmission - one starts to rotate and create fluid pressure, with which the second starts to rotate, as if everything is elementary.

But such a structure is a direct source of heat, I would even say excess heat, which is why it should be of very high quality and not burn. The second link that heats the oil inside is the friction discs, they are also capable of overheating in rotation.

That is why modern automatic transmissions are now equipped with a liquid cooling radiator, this is a must! It takes the heat that is generated inside and dissipates it outside by blowing the incoming air, as well as from the fan of the main engine cooling radiator (usually mounted next to it). After all, even traffic jams, without much slipping, can warm up the machine quite strongly, and you stand still, so the airflow turns on to save the machine from excess heat.

Now let's imagine slipping in snow or mud, what is happening here?

You are standing still - the car slips, the pressure and friction of the fluid inside the torque converter is RUNNING, and the temperatures are also dropping the friction discs. This makes the liquid inside boil! There is no airflow, the machine is stationary, the engine fan turns on, but it is not able to dissipate that much heat. That is, ordinary boiling occurs inside. True, I want to make a reservation - this is when you skid for a really long time, say more than 15 minutes, constantly without rest.

Why is it detrimental to automatic transmission:

• The torque converter suffers greatly, from high temperatures, it can simply be warped, because it not only warms up, it is also under pressure. I personally saw that the blades were breaking.
• Friction discs. As we have already with you, they are divided into two types - metal and soft, usually made of pressed and impregnated paper (in other words, cardboard). For them, high temperatures (boiling) are very destructive, they begin to decay corny. Sometimes they even stick to metal discs. And this is already 100% repair.
• ATF is liquid, it also has a limit. After it boils, if the temperature continues to rise, it begins to "burn", like all oils (even the engine). And after this has happened, it loses its properties for lubrication and begins to thicken, and in the most difficult cases, precipitate. Thus, not only is the box not effectively lubricated, but also the liquid begins to clog all channels, for example, the cooling radiator, valve body, oil pump.

Here are the answers to all your questions. This is why many manufacturers install warning systems on the dashboard that can forcefully shut off your transmission when you slip too much! As I think this is very correct! The car keeps its knot itself.

So what shouldn't be skidded at all?

Guys you can, but without fanaticism! If you feel that you have specifically sat down, then you need to ask to be pushed out, that is, you need to help your "automatic", he may not be able to cope alone.

Slipping should occur as:

• We do not skid on the D - DRIVE mode, it is practically prohibited. The gearbox from high revs can jump through gears, which is destructive for it.
• If there is a reduced mode, it is usually "L", or "manual mode" - we set the first or second gear. It is on them that you need to slip.

• Remember that after 3 minutes of constant slipping, the temperature in the automatic transmission rises by 30%! In 5 minutes at all 40%, this is already the limit. So after 2 - 3 minutes of slipping, let the machine rest. I would even drown the car and leave it for 10-15 minutes, in winter it will cool down very quickly.

• If you feel that you have sat down specifically, then it is better to call someone to help, either push or pull out! Don't ruin your transmission.

Follow these simple rules, and it will work for a long time, it will only delight you.

Is it possible to slip on a four-wheel drive machine?

Guys are often automatic transmissions, on SUVs there is little difference - I mean the design. There is also a cooling radiator, the same - a torque converter and friction discs. Doesn't that tell you anything? True, to carry such a "carcass", such transmissions can "digest" more torque than an ordinary foreign passenger car, it would be super blasphemy - for the boxes to be the same on a class "A" car and a heavy frame SUV... All the same, the designs are slightly different, in SUVs it is stronger, if you want reinforced or something.

But after all, its weight is different, it often approaches 3 tons, but an ordinary ordinary (classes "B" - "C") foreign car weighs about 1 ton. Therefore, it will be stronger in an SUV.

Many motorists do not know if it is possible to slip on an automatic machine, especially in winter. Winter drifting is often a cool activity for young people. However, there are pitfalls here.

With the arrival of the winter period, it is very often possible to observe situations when the car is in a snowdrift and the driver is trying to skid out of it. It's just that in this case, a person is too lazy to take a shovel and bake his car from a snowdrift. In this case, drivers rely on the fact that winter tires, paired with the power of the power unit will do their job.

This method can be used only in cases where a "mechanics" is installed on the car. In this case, the buildup of the car is used by switching the first and reverse gears. The situation is different in the case when the machine is equipped with "Automatic". Its principle of operation is to increase the oil pressure when the crankshaft speed increases. Therefore, in the event of an increase in pressure, the friction discs are pressed, and the shift valves themselves are fully automatic, which does not depend on the driver. Simply put, the automatic transmission itself performs gear changes when certain values \u200b\u200bare reached.

On the "mechanics" of the car, you can swing the car by switching the speeds with your own hands, but on the "automatic" this will not work also because it is a little late during switching. In this case, the load on the box will not correspond to the required values. Due to this, it will only take a short period of time to boost automatically. However, this is only possible if the oil in the gearbox is given the right time to cool.

Answering the question why it is impossible to slip on the “automatic”, it should be said that if only the clutch can fly at the manual transmission in this case, then with an automatic transmission everything is much more complicated. The design of the "machine" is more confusing, which means more expensive. Therefore, any even small breakdown will lead to serious economic expenses for repairs.

In general, it is possible to slip on the "automatic", but apart from the possible breakdown, this significantly increases the consumption of oil and fuel. Therefore, there is no point in driving and pressing the gas pedal corny. Based on this, if you are trapped in snow, then you should ask other drivers to pull you out or dig your car yourself.

Visit our auto portal there are many interesting things -

Oh, how many decades of this truly global "problem" ... Yes, probably as long as the automatic transmission itself on a mass car. As soon as the first breakdowns appeared, coinciding with the winter season, stories and horror stories rushed through the sundresses. Say, that's it - it's impossible to skid on the machine for a second, but it's better to put it in the garage and not touch it, out of harm's way ... And as usual, I propose to together evaluate the degree of sanity of the common horror story on this topic, having analyzed the question from a technical point of view. I will note right away that today we are talking about classics, all sorts of DSGs and the like - a separate topic.

And first, I recommend that you familiarize yourself with the concise and understandable theory of the transmission of torque by liquid in the classical torque converter automatic transmission... Her we examined in detail here, in the light of the aspect of no less Shakespearean question "to change or not to change" oil.

That's it, the machine gun of this car can be carried to the trash ... She turned the wheels in place ... (photo: show-cars.ru)

Where did the dogma "you can not slip on the automatic transmission?"

The logic of such statements is simple: slipping in the snow (or mud, on ice - it doesn't matter) will certainly overheat the oil and that's all - that's all. This, in turn, will entail inevitable death, or at least a costly malfunction of the korobas, followed by a large amount of money.

And in fact?

But in fact, in an automatic transmission, unless it is, of course, produced in 1936, everything has long been provided for you. And no matter how the lovers of the theories of Masonic lodges do not clamor, it is not profitable for manufacturers to repair the crumbling boxes every winter at their own expense. And therefore:

AND) Even most old boxes (early to mid eighties) have a separate oil radiator... It serves the same purpose as the usual one in the engine cooling system: to cool the liquid without allowing it to overheat.

Option of a separate heat exchanger (radiator) for automatic transmission (photo: avtoexperts.ru)

B) In addition to the oil cooler, a thermostat is also placed in the cooling circuit of the box. Which is designed not only to bypass the liquid through the radiator with the threat of overheating, but also to bring ATF to the operating temperature as quickly as possible, constantly maintaining it at the same level. That is, statements such as "hot in no case is possible, but a little cold" (or vice versa) are also untenable.

The option when the box radiator is integrated into the coolant radiator (photo: fortunerclub.ru)

IN) Modern auto boxes have overheating protection. If you have been persistently grinding in place for a minute now (though why is not clear, but this is a different question), then the ECU of the box sees that the owner is not adequate and the liquid is about to boil. Then the automaton goes to emergency mode, forcibly limiting engine speed. That is not an uncommon case when the car turns out to be smarter than the owner.

And what is the result?

And we always have the same result: be friends with your head and study materielrather than the scribbling of office specialists on the forums. If you do not plan to compete in a winter rally in Finland or bury your car in a snowdrift, put a brick on the gas and go home - nothing will happen to your crystal automatic transmission... And even if you skid a little for a minute or two in an attempt to escape from the snow captivity - with competent actions behind the wheel of a seated person, the box will not even notice it.

Hope it will be helpful to someone!
All serviceable boxes and less jams!

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