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A transmission control unit (TCU), also known as a transmission control module (TCM), or a gearbox control unit (GCU), is a type of automotive ECU that is used to control electronic automatic transmissions. Similar systems are used in conjunction with various semi-automatic transmissions, purely for clutch automation and actuation.
An automatic transmission (sometimes abbreviated AT) is a multi-speed transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions. The 1904 Sturtevant "horseless carriage gearbox" is often considered to be the first true automatic transmission.
A transmission (also called a gearbox) is a mechanical device which uses a gear set—two or more gears working together—to change the speed, direction of rotation, or torque multiplication/reduction in a machine. [1] [2] Transmissions can have a single fixed-gear ratio, multiple distinct gear ratios, or continuously variable ratios. Variable ...
Geartronic is Volvo Cars' name for its manumatic automatic transmission, similar to Porsche's Tiptronic. It is available in 4-, 5-, 6-, and 8-speed models, and is controlled by a microprocessor . The microprocessor automatically shifts to the next gear if a user in manual mode red lines the engine.
The Easytronic system allows for a computer to assume control of the manual gearbox and clutch via electromechanical means. As of Easytronic 3.0, [2] the gearbox can be operated in either fully-automatic or sequential semi-automatic mode. In the former, the car behaves much like a traditional automatic transmission, selecting gears with no ...
A semi-automatic transmission is a multiple-speed transmission where part of its operation is automated (typically the actuation of the clutch), but the driver's input is still required to launch the vehicle from a standstill and to manually change gears.
A continuously variable transmission (CVT) is an automated transmission that can change through a continuous range of gear ratios, typically resulting in better fuel economy in gasoline applications. [1]
The cross-drive transmissions offered a mechanically actuated self-changing gearbox, where the ratio selection could be either manual, automatic, or by pre-selection. The control input for steering also became lighter, allowing the use of a single hand-controlled joystick or "wobble stick", as used for the CD-850-1 transmission in the T44 Cargo ...