automatedmanual

An automated manual transmission, abbreviated AMT, is a type of drivetrain that automates the gear shifting of a traditional manual transmission. It aims to combine the simplicity and efficiency of a manual gearbox with the convenience of an automatic shift, without requiring a clutch pedal in most driving modes. AMTs are also referred to as robotic manual transmissions, robotized manual gearboxes, or automated manuals.

How it works: an AMT uses a conventional manual gearbox with its clutch and gear shifts operated by electronic actuators rather than a driver’s foot and hand. A transmission control unit monitors engine speed, vehicle speed, throttle position, and gear selection, and commands hydraulic or electro-hydraulic actuators to engage or release the clutch and to move the gear selector. The system can run in automatic mode, where it selects shifts by itself, or in a manual mode with upshift and downshift controls, such as a shift lever or paddle shifters.

Operation and modes: most AMTs offer a fully automatic mode for ease of use, plus a manual or semi-automatic mode that allows the driver to influence shift timing. Some implementations aim for smoothness comparable to conventional automatics, while others emulate the feel of a traditional clutch by adjusting shift characteristics. Fuel economy and performance depend on the software tuning and the underlying manual gearbox.

Advantages and drawbacks: AMTs generally cost less to produce than traditional automatics or dual-clutch transmissions and can offer good fuel efficiency. They can be lighter and simpler, and provide manual-mode control. Drawbacks include potential abrupt or delayed gear changes, clutches that wear with use, and varying shift quality, especially in low-speed, stop-and-go driving.

Applications: AMTs have been used in a range of passenger cars and light commercial vehicles, particularly where cost pressures favor a manual gearbox with automated shifting rather than a fully automatic transmission.