The air and fuel systems of gasoline engines prepare
an air-fuel mixture which allows the engine to generate
the required torque. Simultaneously, this mixture also
fulfills further requirements, for example from the
exhaust system. The electronic engine control adjusts
the ideal air-fuel ratio and the optimal injection timing.
The engine control evaluates sensor signals from the
entire drivetrain and the exhaust system, prioritizes
them and converts them into control commands.
The accelerator-pedal module (APM) comprises
an accelerator pedal and a potentiometer or a noncontacting
Hall sensor as angular-position sensor.
This sensor registers the movement and the position
of the accelerator pedal. From this information, the
engine management calculates the required torque
and accordingly addresses the throttle device and
the injection system. The accelerator-pedal module
can output analog or digital signals.