Component Description For Boost Pressure Regulator - Mercedes-Benz OM 471 Introduction Into Service Manual

GF09.40>W>4020H
ENGINES 471.9 in MODEL 963
Location
Shown code (M5Z) Engine version Euro VI
1 Turbocharger
2 Vacuum cell
Y636 Charge pressure positioner
The boost pressure regulator (Y636) is
located on the right side of the engine next
to the turbocharger (1).
Task
The vacuum cell (2) on the turbocharger (1) has compressed air
applied to it over the boost pressure regulator (Y636).
If the engine management (MCM) control unit (A4) recognizes
that the current boost pressure or the rotor speed is too high it
limits the boost pressure or the rotor speed in that it actuates the
boost pressure regulator (Y636) with an appropriate pulse width
modulated signal. The engine management (MCM) control unit
(A4) can use the duty cycle of this signal to influence the pressure
(up to 2.8 bar) which should be applied to the vacuum cell (2).
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >

Component description for boost pressure regulator

– This printout will not be recorded by the update service. Status: 09 / 2011 –
System components
A valve is opened on the bypass opening over a linkage according
to this pressure which allows more or less exhaust to be led past
the turbine wheel dependent on how wide it is opened.
Since only part of the exhaust (D) hits the turbine wheel the
acceleration is not so strong anymore and the boost pressure or
the rotor speed drop.
1.7.11
W09.40>1212>06
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