An active dual-clutch transmission (DCT) is a type of automatic transmission designed to improve efficiency and performance over traditional automatic transmissions.
Operating principle
A DCT is similar to a regular manual transmission, but instead of one clutch it has two:
* Odd clutches: Control the four odd numbered gears (1, 3, 5, 7).
* Even clutches: Control the four even-numbered gears (2, 4, 6, reverse).
A unique feature of DCT is that the two clutches operate independently of each other:
* The odd clutch connects the drive shaft to the odd gears, and the even clutch connects the drive shaft to the even gears.
* When one gear is engaged, the next gear can be preselected on the other clutch, allowing for quick gear changes.
Advantages
Compared to traditional automatic transmissions, DCT offers the following advantages:
* Fast gear shifting: Thanks to the pre-selected gears, shifts are very quick and smooth.
* Increased Efficiency: Elimination of a torque converter and independent clutch engagement reduces power loss, improving fuel efficiency.
* Wider Ratio Range: DCT can have more gears than traditional automatic transmissions, providing optimal gearing for different driving conditions.
*Higher performance: Fast gear changes and a wide range of gear ratios improve vehicle performance.
*Sport Mode: Some DCTs have a Sport mode that optimizes gear shifting for more aggressive driving.
Flaws
*Higher Cost: DCTs are typically more expensive than traditional automatic transmissions.
* Complexity: DCTs are more complex to maintain and repair.
* Potential durability issues: Some DCTs have experienced durability issues due to the high load imposed by the two clutches.