SL 600 (129.076) V12-6.0L (120.981) (1995)
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Electronic Throttle Actuator: Description and Operation
Accelerator Actuator
DESCRIPTION
The electronic accelerator actuators (M16/3 and M16/4) operates the throttle valves.
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The electronic accelerator control unit (N4/1) controls the electronic accelerator actuators.
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It sends the electronic accelerator control unit a throttle position signal.
DESIGN
The accelerator actuator consists of a reversible DC motor with a multistage reduction gear. The output shaft for the throttle valve control linkage
is attached to the output lever. The moving contact (wiper) of the potentiometer as well as the double-contact safety switch are both attached to the
output shaft.
OPERATION
If the ignition switch is in the on position or if the engine is running, the electronic accelerator control unit supplies a constant voltage to the
potentiometer. The moving contact (wiper) returns a voltage to the control unit which is directly proportional to the output shaft and therefore
throttle valve position. This position signal is processed by the system control portion of the control unit, which energizes the motor to change the
position of the throttle valve if necessary. The accelerator actuator output shaft can move through an angle of 88 - 92~, allowing a full range of
throttle valve openings from idle to wide open. The DC motor has a high adjustment speed, covering the entire adjustment angle in approx. 120 m
sec. At the same time, the positioning is very accurate.
