Sequential automatic transmission (automatic transmission)
A sequential automatic transmission is an automated manual transmission with sequential shifting that combines elements of an automatic and manual transmission.
Operating principle
* A sequential automatic transmission uses the same gear shift principle as a manual transmission, but uses an electronic selector instead of a shift lever.
* The selector allows the driver to change gears sequentially in order (up or down) without using the clutch pedal.
* Torque is transmitted from the engine to the transmission through a set of gears and clutches controlled by an electronic control unit (ECU).
Advantages
*Quick Shifting: Sequential automatic transmissions provide faster gear changes than traditional torque converter automatic transmissions.
*Improved Fuel Efficiency: Sequential shifting allows the engine to operate in the optimal RPM range, resulting in lower fuel consumption.
* Improved Performance: Sequential automatic transmissions provide smoother, more responsive acceleration and better handling.
*Lightweight: Sequential automatic transmissions are typically lighter than traditional automatic transmissions, providing additional weight savings and improved handling.
Flaws
*High cost: Sequential automatic transmissions tend to be more expensive than traditional automatic transmissions.
*Hard Shifting: Some sequential automatic transmissions can shift harsher than traditional automatic transmissions.
*Difficulty to use: Sequential automatic transmissions can be somewhat more difficult to use than traditional automatic transmissions, especially for inexperienced drivers.
Application
Sequential automatic transmissions are commonly used in sports cars and luxury cars where high performance and precise shifting are required. They are also used in some production passenger car models.
Examples
*Audi S tronic
*BMW M DCT
*Mercedes-Benz Speedshift MCT
*Porsche PDK
*Volkswagen DSG