What s going on with the revs increasing when the automatic transmission downshifts

Normally, when the speed remains the same, the gearbox downshifts, the speed will inevitably increase, and the engine power and torque can be obtained while the speed is increased, and the vehicle can improve better acceleration performance.

How the automatic transmission works when downshifting:

The automatic transmission car cannot artificially downshift while moving, so the internal program of the transmission is set up with a function: press the accelerator pedal to the end, and the transmission will know the driver's intention to accelerate in a hurry, so it will automatically lower a gear.

This is due to the hydraulic coupling between the torque converter and the engine flywheel, and the separation of the lock-up clutch.

The transmission ratio has changed, and the speed will naturally increase when the gear is lowered at the same speed.

Hand by hand, right? Manual downshift?

Due to structural reasons, the dual-clutch naturally has shortcomings in shifting logic. If the design is not good, it is easy to overheat and the reliability will be poor. However, this can be greatly improved as the technology matures, so the reliability of the dual clutch is good.

When it comes to dual-clutch transmissions, we have to mention that Volkswagen's dual-clutch gearbox, Volkswagen's dual-clutch gearbox is almost standard for the entire system. At first, Volkswagen used not their own gearbox, but Aisin's gearbox. At that time, when Magotan **, Aisin's ** was limited!

With the advancement and maturity of technology, the reliability of large parts such as engines and gearboxes has been greatly improved. Speaking of gearbox alone, the reliability of AT and CVT was not very good at the beginning, but with MT, they have developed for so many years, solved technical problems, and naturally the reliability is getting better and better. There is also the advantage of a dual clutch.

While the dual clutch also has drawbacks, its advantages are also favored by major manufacturers. For example, the dual clutch has the advantages of fast shifting, fuel economy, and low power loss, making it ideal for fast driving!

The advantages of the dual clutch are the high efficiency of the direct transmission and the fast shifting. So if you look at Volkswagen, the power data is not very strong, but the acceleration data is very good, and that's using the dual clutch. 0-100 acceleration, the gear of the dual clutch leaves the previous gear and is immediately connected, saving a lot of power interruption time.

In addition, the dual-clutch transmission efficiency is high (more than 97%), so it is possible to run for 10 seconds with the Passat in a row. In contrast, the AT transmission torque converter has a loss of power and the shift speed is still a little slower than the dual clutch.

Therefore, the dual-clutch transmission used in some sports cars is also more common, and the more typical one is Hyundai First and the domestic car MG 6. The life cycle of dual-clutch transmissions is still relatively short. The reason it leaves people with poor reliability is that some manufacturers only care about making money and rush to start when the dual-clutch technology is not mature enough, resulting in a high percentage of defects.

This impression will not change in a short time, but sooner or later it will get better.

And his patent fortress. Some people may say that after the public is cheated by Aisin, why can't they develop their own set? AT: I believe that it is perfectly capable to develop his own gearbox with Volkswagen's strength and financial resources, but even if he develops the gearbox, he will not be able to bypass some patent fortresses.

In addition, patents in this area have been monopolized by other companies. Even if the public develops it themselves, it is not possible to bypass them, so it is better to open another furnace yourself. The patent for dual clutches in this area is relatively weak, so domestic cars are also keen to develop such transmissions.

The main reason for the slow upshift is that he can't lift the speed when he loosens the clutch, and the first point is that he should pay attention to the speed of his gear shift, and the second point is that he should pay attention to his own driving skills to master some of these skills to improve.

It will be affected by the logic of shifting, and if you change gears too often, it will cause severe frustration; Don't be too fast when changing gears, you should release the accelerator first and then press the clutch when upshifting, and then choose a new gear, be sure to match the speed when changing gears, be sure to pay attention to accelerating first, then upshifting, and then downshifting after deceleration.

If you want to effectively improve this problem, you need to maintain good driving habits in daily driving, and check the transmission as much as possible.

Automatic transmission.

There are several reasons why upshifts cannot be done properly:

1. Throttle cable or throttle.

If the position sensor is not properly adjusted, check and adjust the throttle cable and the throttle position sensor to solve the problem.

2. If the speed sensor is faulty, check the speed sensor and replace the speed sensor.

3. If the shift valve is stuck or the gear switch is faulty, check the gear switch signal, and if the control system is not faulty, the automatic transmission should be dismantled and checked.

The reasons why the automatic transmission cannot upshift are the throttle cable or improper adjustment of the throttle position sensor; There is a fault in the governor; oil leakage from governor oil circuit; Failure of the vehicle speed sensor; There is a fault in the 2nd gear brake or high-grade clutch; Shift valve jamming or gear switch failure.

Automatic transmission fault diagnosis and troubleshooting.

1. For electronically controlled automatic gearbox, fault self-diagnosis should be carried out first. Sensors that affect shift control include: throttle position sensor, vehicle speed sensor, etc. Find the cause of the failure by the faults displayed.

2. Readjust the throttle cable or throttle position sensor according to the standard.

3. Check the speed sensor. If damaged, it should be replaced.

4. Check the gear switch signal. If there is an abnormality, it should be adjusted or replaced.

5. Measure the oil pressure of the governor. If the oil pressure of the governor is still 0 or very low after the speed increases, it means that the governor is faulty or the governor oil circuit is seriously leaked. In this regard, the governor should be dismantled and inspected.

If the governor valve core is stuck, it should be disassembled and cleaned, and the valve core and valve hole should be polished with metallographic sandpaper. If there is still stagnation after cleaning and polishing, the governor should be replaced.

6. Use compressed air to check whether there is any leakage in the oil circuit of the governor. If there is a leak, the sealing ring or sealing ring should be replaced.

7. If the oil pressure of the governor is normal, the valve plate should be disassembled and each shift valve should be checked. If there is a cassette in the shift valve, the valve core can be removed, polished with metallographic sandpaper, and installed after cleaning. If it cannot be repaired, the valve plate should be replaced.

8. If there is no fault in the control system, the automatic gearbox should be disassembled, check whether there is slippage of each shift actuator, and check whether there is leakage in the oil circuit or piston of each clutch and brake with compressed air.

Automatic transmission fluid.

Generally, it is replaced every 5-80,000 kilometers. If you don't change the transmission oil, the cold car will have a weak start. The vehicle is prone to slight skidding and other phenomena during driving.

If the transmission oil is not changed for a long time, the transmission oil will become thicker, which is easy to block the transmission radiator, resulting in excessive transmission oil temperature and aggravated wear.

The electronically controlled automatic transmission allows for fault self-diagnosis. Sensors that affect shift control include: throttle position sensor, vehicle speed sensor, etc. Find the cause of the failure by the faults displayed.

Once the automatic transmission cannot be upshifted, it should be sent for repair in time. Failure to do so may result in the vehicle not leaving, or even the entire gearbox being scrapped.

1. The speed of the automobile engine is related to the number of work times per unit time or the effective power of the engine, that is, the effective power of the engine changes with the different speeds. Therefore, when the effective power of the engine is a certain amount, there is a corresponding ratio speed.

2. When there is a sudden increase in speed, it indicates that it does not match the actual power, simply put, the fuel injection is increased, and the ECU will give the appropriate amount of fuel injection according to the collected data at a certain speed, and the object of collection is generally based on the throttle opening, water temperature, air intake, etc.

3. It is recommended to check the air intake part or pipeline; inspect the throttle body part (including the sensor); Check the water temperature sensor; Check the injector and ignition; Check the accelerator pedal and sensors.

This is normal, it can only mean that the quality of your previous oil has dropped greatly, and the new transmission oil is more smoothly transmitted! It's normal, don't worry about anything!

The slow upshift of an automatic transmission can be caused by a faulty shift solenoid valve. In the case of occasional failures, they can generally be resolved by eliminating the failures** or upgrading the program. In the case of a non-accidental failure, the corresponding attachment needs to be replaced.

Gearbox slow gear refers to the fact that when the car is driving, the gear speed is significantly higher than the standard value, and the engine speed is slightly higher before the gear, which is required.

The slow upshift of an automatic transmission can be caused by a faulty shift solenoid valve. In the case of occasional failures, they can generally be resolved by eliminating the failures** or upgrading the program. In the case of a non-accidental failure, the corresponding attachment needs to be replaced.

Transmission slow gear refers to the car driving, the gear speed is significantly higher than the standard value, the engine speed before the gear is slightly higher, the need to use the accelerator pedal in advance of the gear operation method (that is, release the accelerator pedal for a few seconds and then press), in order to make the automatic transmission into high speed or overdrive gear. The main reasons for slow upshifts in a transmission are: a jammed governor, a short circuit in the forced downshift switch, a faulty computer or sensor, a damaged throttle position sensor, excessive governor spring preload, improper adjustment of the true empty throttle pushrod, and excessive pressure in the main oil circuit or throttle.

Once the vehicle's gearbox is slowly upshifting, the vehicle should be serviced in time. If there is a problem with the transmission, the entire transmission can be severely scrapped if the owner doesn't care about continuing to use the vehicle. The main cause of transmission failure is that the valve body is too dirty, which can destroy the quality and friction characteristics of the transmission oil, increasing frictional wear.

At the same time, sludge will also be generated inside the gearbox, resulting in blockage of the valve body and pipelines, and the oil pressure cannot be adjusted smoothly, resulting in transmission failure.

What is the difference between automatic transmissions and automatic hands.

Automatic manual transmission, as the name suggests, is the integration of manual transmission and automatic transmission. The driver can choose between manual mode or automatic mode. In automatic mode, it is equivalent to an AT gearbox; In manual mode, because there is no clutch, it is equivalent to an AMT gearbox.

AT, which refers to an automatic transmission. The driver only needs to pull the gear lever to the D position, and the gearbox works separately to shift gears while driving.

The biggest advantage of an automatic manual transmission is that in manual mode, you can experience the feeling of driving a car with a manual transmission. Power comes very directly, omitting the response of stepping on the clutch. Other than that, you don't need to shift gears one by one to jump up and down.

This driving pleasure is not possible with a conventional automatic or manual transmission.

The technical requirements of automatic manual transmissions are relatively high, and the application of advanced technology often means high maintenance costs and demanding requirements.

In principle, there is not much difference, only in terms of acceleration and overtaking. In the case of shifting gears, the manual transmission automatic car allows the driver to do as he pleases, reducing the shift time of a single automatic wave, and the manual is more flexible. For example, in the case of overtaking, you need to change from high gear to ground gear, which can be operated manually with a wave of your hand.

What's going on with the slow upshift of the automatic transmission What is the difference between the automatic transmission and the automatic manual @2019