Recently, on foreign carsproduction there is an automated mechanical transmission. This is not a classical mechanics and not all the known automaton. This is something average. What is an AMT box? Reviews and the device of an automated transmission - later in our article.
This node is a mechanicalgearbox. But the switching of speeds here occurs in an automatic mode. The choice of the desired transmission is made by the electronic control unit. The ECU responds to the sensor signals and generates a reverse pulse.
What does the AMT gearbox consist of? This transmission includes several units:
- Drive and clutch disks.
- Shift lever.
- Electronic control system.
Any robot uses a double frictionclutch. On conventional mechanics, one disc is used. This design allows you to quickly switch gears to AMT. "Lada Vesta", which began to install robotic boxes, much faster than its analog on the mechanics. And this despite the fact that the clutch pedal in AMT as such is not. But not only concern Volkswagen-Audi and AvtoVAZ use such a box.
Types of clutches
There are several types of clutches in the AMT box:
In the first case, electric motors are used. Such a drive has a lower response speed. Gear shifts are three to four times slower than those with a hydraulic drive. The switching time is 0.3 to 0.5 seconds. But still faster than automatic transmission.
About Transmission Efficiency
According to manufacturers, roboticbox - one of the most technologically efficient in terms of efficiency. It is about 97 percent. On the automatic transmission, the efficiency is 90 percent.
The main advantages of the automatic transmission:
- Low fuel consumption. The machine on the "robot" spends almost as much as on the mechanic.
- A small amount of oil. In this box it is necessary to fill up to 4 liters of liquid. This is two times less than on a similar automatic transmission or variator.
- High clutch life. Since the switching process is controlled by electronics, and not by the driver, the risk of burning the clutch is near zero (unless you intentionally press the accelerator and the brake simultaneously).
- The presence of semi-automatic mode. At any time, the driver can switch to manual mode and choose the moment when to switch to an increased or lowered gear.
Also, drivers note a high speedeven in automatic mode. And all thanks to the use of multi-plate clutch. When the car is moving in the first gear, the second disc is already in mesh with the next one.
Disadvantages of transmission
Reviews note the impossibility of reflashing the checkpoint onother mode. Also, when driving in a traffic jam, car owners are very hot on the clutch. To save the box from wear, you have to switch to the "Tiptronic" mode.
About oil change
The manufacturer recommends changing the transmissionliquid at least once every 60 thousand kilometers. The cost of a new oil for AMT is 4 thousand rubles. You also need to buy a new filter for 500 rubles. Oil is replaced by a specialized service and costs about 2200 rubles.
Operating modes of the automated box
While driving, the driver can set the leverchange gears in automatic or semi-automatic mode. In the first case the transmission operates, relying on the readings of the sensors and the pulses of the electronic control unit. As for the semi-automatic mode, the "Tiptronic" is used here, which can be found on the "Mercedes" cars with their automatic transmissions. The shift lever has a plus or minus switch.
So, we found out what therobotic gearbox. As you can see, it combines the economy of mechanics and the comfort of the machine. But in terms of service this transmission is one of the most expensive. Often the cost of repairs reaches a mark of 1-1,3 thousand euros. If the mileage of the car is less than 150 thousand (or five years), the repair is undertaken by the dealer himself. But what happens when the car "flies" off the guarantee? All problems and maintenance costs are borne by the car owner. Knowing the problems with AMT, such cars are difficult to sell on the secondary market.