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284
F1C ENGINE
Proportional
solenoid
turbocharger actuator
Figure 312
The solenoid valve modulates the low pressure controlling
the turbocharger actuator, taken from the air circuit of the
servo brake, according to the information exchanged
between the electronic control unit and the sensors: engine
speed, throttle pedal position and pressure/temperature
fitted on the intake manifold.
As a result, the actuator varies the opening of the blades of
the turbocharger that adjust the flow of exhaust gases.
Figure 313
1. Variable geometry turbocharger - 2. Pneumatic actuator - 3. Proportional solenoid valve - 4. Air filter -
5. EDC 16 control unit - 6. Servo brake - 7. Vacuum device - 8. High-pressure pump.
Base - March 2006
valve
controlling
62876
TURBOCHARGING FUNCTIONAL DIAGRAM
Actuator
Figure 314
SECTION ON THE ACTUATOR
The actuator diaphragm, connected to the control rod, is
governed by the low pressure on the top of the actuator.
The low pressure modulated by the proportional solenoid
valve varies the movement of the diaphragm and, as a result,
of the rod governing the turbine's mobile blades.
D
E
4
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URO
62875
62869
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