Automatic Transmission System in Cars PPT

Introduction

An automatic transmission, often abbreviated as AT, is a type of gearbox that can automatically change gear ratios as the car moves, freeing the driver from having to shift gears manually.

Automatic transmissions are more convenient and easier to drive than manual transmissions, but they are also more expensive and less efficient.

How does an automatic transmission work?

An automatic transmission uses a hydraulic system to shift gears. The transmission is controlled by a computer, which monitors the car’s speed, engine speed, and throttle position.

When the car accelerates, the computer sends a signal to the transmission to shift to a higher gear. When the car decelerates, the computer sends a signal to the transmission to shift to a lower gear.

Types of automatic transmissions

There are two main types of automatic transmissions: conventional automatic transmissions and continuously variable transmissions (CVTs).

Conventional automatic transmissions

Conventional automatic transmissions use a planetary gearset to change gears. The planetary gearset is made up of three gears: a sun gear, a ring gear, and a planet carrier.

The sun gear is connected to the engine, the ring gear is connected to the driveshaft, and the planet carrier is connected to the transmission case.

By engaging different combinations of gears, the transmission can change gear ratios.

Continuously variable transmissions (CVTs)

CVTs use a belt or chain to change gear ratios. The belt or chain is wrapped around two pulleys, one of which is connected to the engine and the other of which is connected to the driveshaft.

By changing the diameter of the pulleys, the transmission can change gear ratios.

Advantages and disadvantages of automatic transmissions

Advantages

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Disadvantages

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Conclusion

Automatic transmissions are a convenient and easy-to-use option for drivers who want to avoid the hassle of shifting gears manually.

However, automatic transmissions are also more expensive and less efficient than manual transmissions. Ultimately, the best type of transmission for a particular driver depends on their individual needs and preferences.

Additional resources

* How an Automatic Transmission Works
* Automatic vs. Manual Transmission
* How an Automatic Transmission Works