Do automatic transmissions have to warm up before driving and why?

In the past, the vehicle was hot, and it needed to idle in place for a period of time before it could be driven, so in many people's concepts, only idling in place was a hot car, but in fact, the hot car is a process, not just waiting in place after the vehicle starts. Today's vehicles can indeed drive directly after starting, and the factory does not recommend idling in place for a long time, which is not good for the vehicle. But this does not mean that there is no need to warm up the car, the vehicle should not be too fast at the beginning, drive slowly for two or three minutes, and wait for the water temperature to rise before the hot car is completed.

The reason why CVT's so-called low-temperature protection cannot be driven after starting in a low-temperature environment is that in addition to this gearbox, there is no hot car problem with automatic transmissions such as AT, DCT, AMT, etc.; Therefore, in winter, the car can be used normally after starting, unless it is afraid of cold and deliberately hot car heating, the in-situ hot car will indeed increase carbon deposits, but a few feet of the accelerator pedal can also effectively clean up carbon deposits in the driving after the hot car.

More than a decade ago, cars with carburetors did need to be hot, because the ambient temperature was too low would affect the atomization injection effect of the fuel, and poor fuel injection before the carburetor ideal temperature was reached would cause the vehicle to idle unsteadily, shake or stall. The carburetor era has completely ended, the current production cars are all EFI engines, the fuel injector is a solenoid valve has no temperature requirements, as long as it is started, the best atomized fuel injection state can be achieved. Therefore, there is no need to heat up the engine alone, and the engine will be injected with concentrated fuel before the cold start water temperature is not high enough, and the increase in the amount of fuel injection will cause part of the fuel to not be fully combusted, resulting in the formation of carbon deposits.

The same is true for the gearbox, the manual gearbox only relies on splash lubrication, and the other parts of the gear are not lubricated, and the gearbox of AT CVT relies on the torque converter to drive the oil The requirements for oil are already very high, and the lubrication can be quickly formed after starting; The dual-clutch transmission is an upgraded version of the manual transmission, with no problems with gear splash lubrication, and the wet dual-clutch layout is mainly for heat dissipation in the oil cavity, and the dry type is non-lubricated.

If you want to reduce carbon deposition, only by driving normally in the shortest time and letting the water temperature rise rapidly can the fuel injection amount be adjusted in real time with the air intake volume to achieve the best air-fuel ratio and thermal efficiency, while the in-situ hot car not only increases carbon deposition and the water temperature rises slowly but also increases fuel consumption, which can be said to be disadvantageous but not beneficial. As for the lubrication of the engine and gearbox, it is not necessary, engine wear is a short-term abnormal wear at the moment of cold start due to insufficient lubrication, and the oil pump will quickly form oil pressure to effectively lubricate all parts of the engine after starting; If there is no rattle after starting, the oil has good fluidity at low temperatures, the valve lifters have been effectively lubricated, and other parts are not a problem.

Hello subject! Needed, especially when it's cold. Although the engine is a body of steel, but there is also a problem of thermal expansion and contraction, it is necessary to run smoothly at a certain temperature, and the ambient temperature is generally lower than this optimal working temperature, so preheating is a must, no matter what model it is after the cold car starts, it is recommended to warm up the car for a while before it is recommended to go on the road normally. ‍‍

The geartrain of the gearbox is extremely stiff, and as long as it is not defective in design, it will not be damaged in normal use, but there is an exception - CVT gearbox. This kind of gearbox relies on the steel belt and the cone pulley to form an angle, and the pressure is formed by hydraulic pressure to the cone pulley to achieve different angle changes to change the gear ratio, this structure has high requirements for the steel belt, but the steel belt itself is not wear-resistant, so it must be used normally after the transmission oil fluidity is high enough. ‍‍

There is no need to warm up the car, just don't drive too fast when driving, now the car has an automatic protection function.

There is no need to warm up the car, you can walk after the idle speed stabilizes after starting, and don't use the throttle for a few kilometers before the water temperature rises.

In fact, the so-called hot car is related to cold start. After the vehicle is parked for a long time, the engine is cooled, and the start at this time is the cold start, and the vehicle needs to go through a process to achieve the normal driving state after the cold start, and the process from the cold start of the vehicle to the water temperature rising to the normal working temperature is actually a hot car.

Whether the car is hot or not, the main thing depends on your local temperature, for most of our general areas, there is no need to idle for a long time, but it is an exception in the extremely cold areas of the Northeast.

I think I should warm up the car, because it's better for the car.

It is necessary to warm up. In the morning, after the car starts, there will be a lot of noise. One of the reasons is that the oil does not fully reach the friction surface, the second is that the parts with large clearances are hit, and the third is that the idle speed is too high.

Because low temperatures can make it difficult to start, the engine computer adjusts the idle speed according to the temperature, and the lower the temperature, the higher the idle speed. At this time, the mixture concentration is also high. Due to the low temperature of the oxygen sensor, it cannot work immediately, so the engine is in the open-loop working state at this time, and the exhaust emission state is the worst (the exhaust gas smell is very strong after cold start), and the engine is in the worst state at this time.

1.It is necessary to warm up the car. Due to the low temperature of the newly started engine, the lubricating oil of each part is not yet in place, and starting the engine immediately will cause dry grinding and wear of parts.

2.The warm-up time should not be too long. When the water level gauge hands start moving, or the engine tachometer starts and then falls back to idle, you can drive, or wait a minute or so.

3.If you are afraid of trouble, drive at a low speed for the first 2 kilometers after starting, and then drive normally. 4.

Theoretically, it takes 1 minute to warm up the car, all the oil hangs under the engine case, and there is almost no oil in the upper part, which is constantly conducive to high-speed driving.

Recently, a car owner asked whether the automatic transmission car should be heated before driving? Does the new automatic car need to be warmed up? Bian Xiao once again stressed that the car must be warmed up.

Many friends say that your knowledge needs to be updated, and the properties of the engine have not fundamentally changed. The engine is a hot engine and must be operated in a hot state.

Many friends say that the engine is now an EFI machine.

In fact, the EFI machine is the same, it also needs to be ironed.

EFI can only automatically adjust the amount of fuel injected.

But the entire combustion state has not changed.

You can leave in ten seconds. It's just nonsense.

Because the engine is hot, the working machine must be hot.

A lot of automatic transmissions and even some dual-clutch transmissions.

The cold protection is set.

You can't run when it's cold.

Upshifts are not allowed at all. When it's hot, they all get up.

I dismantled a lot of automatic transmissions.

Internal clutch plates.

The splines in the brake pads are deformed under long-term stress.

That is, the long-term impact between the splines of the code town when the car does not idle.

Friends who have repaired automatic transmissions know it.

Open the gearbox and take a look. Bright and coarse.

The gearbox impact is too noticeable.

There are too many such cases.

When the automatic transmission is running, you have to wait for the bus to get hot.

Many friends ask, does automatic transmission still involve heating?

The automatic transmission has a cooling system.

Connect with the water tank.

The primary heating and secondary cooling of the water tank system.

Stabilize the function of the oil.

There was something wrong with the airtight car, and the engine sounded the alarm for a short time.

Oxygen sensor failure, three-way catalyst failure.

Go straight without heating the car.

Cumulative acceleration of the basic fuel injection of the warmer car.

More than 100 times the amount of fuel injected.

So much oil creates the final carbon deposits.

I hope today's explanation will be helpful to you.

Yes. The easiest way to warm up your car is to look at the tachometer. Most of them can drive very slowly at less than 1000 rpm.

At this time, the water temperature has basically changed, and the oil film is initially established. Slow speed shouting fiber driving can preheat the gearbox. Because the low temperature in the morning can completely freeze the transmission oil, and shifting gears is extremely laborious, it is necessary to warm up the gearbox.

How long it takes to heat up a car depends on the following factors:

1.Machine lubricants.

If the oil quality is high, it will take less time to build up a good oil film and therefore less time to warm up. If the oil quality is not good, the longer it will take to warm up the car.

2.Temperature. Different regions, different times, different temperatures, the lower the temperature, the longer it will take to build up the oil film.

3.Parking time.

If the oil temperature is basically as low as the outside temperature after parking overnight, it will take a long time to warm up the car. If you only stop for two or three hours and lose an hour, there is basically no need to warm up the car.

4.Parking location related.

If it is a flat hot car, then follow the method of a normal hot car, but if it is from a garage or a Zheng You imitator parked uphill on the road section, then the time of the hot car will be different.

A well-functioning hot car can bring the engine to the operating temperature, allowing it to exert the best power and reduce the wear and tear of the engine at low temperatures.

Millions of car purchase subsidies.

1. Automatic transmission vehicles are to heat up the car.

2. In fact, the warming of the car has always been a controversial topic for many people, many people think that the hot car will increase the loss of fuel and produce more carbon deposits, or feel that there is no need to warm the car and never heat the car. In fact, there is no half-dime relationship between the hot car and carbon deposition, and the generation of carbon deposition is mainly caused by the long-term operation of the Luyan engine under small load and insufficient engine combustion, while the hot car only needs to keep the car in an idle state, so the statement of carbon deposition is not credible.

3. In addition, some people think that the electronically controlled gasoline injection system is now used, which is different from the old-fashioned carburetor, so there is no need to heat up the car. Although there are many automatic vehicles now, and there is indeed a big difference compared to carburetors, it should be noted that after a night, all the oil is deposited at the bottom, and the oil pump cannot provide lubrication for the engine normally, so even if it is an automatic transmission vehicle, its engine will be damaged, so it is still necessary to warm up the car.

4. In fact, a hot car can indeed extend the service life of the engine. Studies by authoritative institutions have shown that the amount of wear and tear of the engine during cold start accounts for about half of the total wear. Normal idle warm-up can reduce this wear and tear, which can extend the life of the engine.

Therefore, no matter what kind of vehicle it is, it will play a role in maintenance, but the car with an electronically controlled gasoline injection system can indeed shorten the hot time compared to the carburetor pure vehicle carburetor vehicle.

5. However, the longer the hot car is not the better, in fact, as long as the engine can reach a stable and normal idle speed, you can drive, because the EFI vehicle computer makes the fuel injector injection accurate, and the fuel atomization degree is high, so it only takes a short time after starting, the speed of the machine can be stable and reach the specified idle value, so the hot time of the EFI car should not be too long.

From this point of view, it is still necessary to warm up the car, otherwise it is very easy to hurt the engine, but you have to control the time yourself.

1.Need. The easiest way to warm up your car is to look at the tachometer.

When the speed is slow enough, the water temperature has basically changed, and the oil film has been initially established. Slow driving warms up the gearbox. Because the low temperature in the morning can completely freeze the transmission oil, and the shift is extremely laborious, it is very necessary to warm up the transmission.

2.How long it takes for a car to warm up is a matter of conventional judgment:

3.Machinery oil.

4.If the oil quality is high, the oil film will take less time to build up, so the warm-up time will be shorter. If the oil quality is poor, the life of the car will be longer.

5.Temperature. 6.The lower the time, temperature, and temperature, the longer it will take for the oil film to build.

7.Parking time.

8.If the oil temperature is basically low after parking and the outside temperature is low, then the car will have to drive for a long time; If you stop for only a few hours, it will be very hot.

9.Parking location related.

10.If it is a flat hot car, it is okay according to the ordinary hot car method, but if you come out of the garage or park in the required section, the car will be too time-consuming.

1.An effective hot car can bring the engine to the operating temperature, allowing it to exert its optimal power and reduce the low temperature wear of the engine.