Electronic throttle butterfly control.

High-precision power control - the electronic throttle butterfly control system ensures precise control of engine output by converting the movement of the accelerator pedal to a digital signal that is sent to the engine management system. This results in smoother, steadier power delivery, plus lower emissions and improved fuel efficiency.

Electronic throttle butterfly control replaces the mechanical connection between the accelerator pedal and the throttle with an electronic signal. Also known as "drive by wire", this system sends digital information about the position of the accelerator to the central engine management unit. The position of each of the individual throttle butterfly valves is then adjusted by a tiny electric motor.
The system requires a mere 120 milliseconds to fully open the throttle butterflies, about the same time it takes a skilled driver to fully apply the accelerator pedal. This allows the driver to apply engine power with greater precision and ensures particularly smooth, shudder-free motoring, above all at low engine speeds. Optimally-timed ignition and valve opening, the ideal throttle butterfly position and volume of injected fuel also serves to optimise consumption and emissions control.
A further important point is that electronic throttle butterfly control enhances driving safety by automatically applying a program in the event of a dangerous mechanical defect, such as the throttle butterflies inadvertently being placed in the full load setting. In addition, the driver can, at the press of a button, activate an extra sports setting of the electronic throttle butterfly control system.