Electronic Throttle Actuator: Description and Operation

V12 Component Location:

PURPOSE
The Electronic Throttle Control (EML) Throttle Valve (DK) replaces the previous mechanical transmission and transfer linkage of the accelerator pedal angle between the accelerator pedal and throttle valve.

Electronic Throttle Position Motor:

CONSTRUCTION
^ Throttle butterfly valve
^ Electric motor
^ Gear reduction transmission
^ Feedback potentiometer
^ 17° position switch
^ Return spring

OPERATION
By way of a servo motor, the EML throttle valve is opened by the output stage in the EML control unit against the force of a spring. The output stage activates the servo motor with a square-wave voltage which has a fixed frequency. The different settings of the EML throttle valve are achieved by altering the ratio between the cut-in and cut-out duration.