Easier, relaxed driving
Automatic transmissions make driving easier by taking over the decision of when to change gear and leaving you to concentrate on the traffic and road conditions
The automatic transmission automatically adapts to your driving style at any given time - from leisurely cruising to sporty performance - and also takes the road conditions into account. It not only reduces strain on the engine and transmission in stop-start traffic, but also reduces stress on the driver.
The 'keylock' and 'shiftlock' functions of the automatic transmission provide extra safety. 'Keylock' stops the ignition key from being removed unless the gear selector lever is in the Park (P) position. After the engine is started, the selector lever can only be moved out of positions P or N (Neutral) when the driver presses the brake pedal (shiftlock). This prevents the danger of any unintended movement of the car when the engine is started.
Dual Shift Gearbox (DSG)
The DSG dual-clutch gearbox, available in 6-speed and 7-speed versions, is unlike a conventional automatic transmission.
Two independent gearboxes are connected under load to the engine in turn, depending on the current gear, via two drive shafts. An output shaft assigned to each gearbox applies the torque to the driven wheels via the differential gear. Clutches and gearboxes are operated hydraulically by the gearbox mechatronics (a combination of mechanics and electronics). The electronic transmission control unit, sensors and hydraulic control unit form one compact unit. The control unit uses information such as engine speed, road speed, accelerator position and driving mode to select the optimum gear and to determine the ideal shift point. The control unit then implements the shift commands in a sequence of precisely co-ordinated actions. Each change takes less than four-hundredths of a second. DSG can be used manually, via the Tiptronic gear lever or the optional paddle shifts.