An Automated Manual Transmission or Semi Automatic Transmission allows manual gear changes and uses a clutch but
facilitates the gear changes without a clutch pedal.
It's basically a computerized manual transmission with somewhat automatic
controls/shifters plus an ability to manually shift between gears.
The gears are not laid out in an "H" pattern as in a traditional manual but gear changes are achieved via an
"up" and "down" or "+" and "-" interface on paddle shifters and/or on the gear lever.
How it works is via an electro-hydraulic mechanism in place of clutch pedal and a physical cable to disengage the
clutch and allow gear changes.
The electronics/ECU can also interface with the engine's electronics and
perform rev matching before engaging the clutch again.
An automated manual has a direct connection to the engine unlike a torque converter but is much easier to use than a
conventional gear shifter and clutch pedal.
The gear changes are generally quicker as the clutch can be disengaged and re-engaged faster via the electronics and
launch control can be easily incorporated into the transmission.
Although it's a manual by nature, it can also function as an automatic by using the computer/electronics to shift
between gears automatically.
There are some disadvantages such as a semi automatic is usually more expensive and maybe slightly heavier than a
comparative automatic or manual.
The gear changes are not as smooth as a torque converter automatic (or even manual in some cases) and the regular
transmissions are generally better suited for regular driving and driving in traffic.
Automated manuals can be made for a variety of platforms and found in a variety
of vehicles including sports cars, busses, trucks and even some economy cars.
Most sports cars however, use dual clutch transmission which is a type of
automated manual transmission that uses two clutches to further increase performance.
Performance oriented cars that still use a single clutch semi automatic are the Lamborghini Aventador and Aston Martin
cars.
Some vehicles with semi automatics function as automatics as default with an option to change gears (sometimes via a
sport mode) but vehicles such as supercars may only function as
a manual.
The automated manual transmission (dual clutch included) has become very popular throughout the automotive industry as even
transmission giant ZF makes a semi automatic 8HP transmission.
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