Engine Management, Function - Mercedes-Benz OM 471 Introduction Into Service Manual

GF07.16>W>0003H
ENGINE 471.9 in MODEL 963
The central control and regulator unit for engine management,
which together with the EATS ensures that the engine runs under
all operating conditions in as economical a manner as possible,
with low pollutant and low>noise, is the engine management
(MCM) control unit (A4).
It calculates the optimal beginning of injection as well as the
injection quantity required for combustion according to the
operating condition of the engine and the torque specification of
the drive control (CPC) control unit (A3).
Input signals, shown with code (M5Z) Euro
VI engine version
A4 Engine management control unit
(MCM)
B600 Crankshaft position sensor
B601 Camshaft position sensor
B602 Fuel temperature sensor
B604 Oil pressure sensor
B606 Exhaust coolant temperature sensor
The operating condition of the engine is determined based on
input values from the following sensors:
• Crankshaft position sensor (B600)
• Camshaft position sensor (B601)
Fuel temperature sensor (B602)
•
• Exhaust coolant temperature sensor (B606)
• Intake coolant temperature sensor (B607)
• Charge air pressure and temperature sensor in charge air
pipe (B608)
• Temperature sensor downstream of air filter (B611)
(only with code (M5Z) Euro VI engine version)
Charge air temperature sensor in charge air housing (B617)
•
• Exhaust gas recirculation (AGR) differential pressure sensor
(B621)
• Rail pressure sensor (B622)
Fuel filter module pressure sensor (B638)
•
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >

Engine management, function

B607 Intake coolant temperature sensor
B608 Charge air pressure and
temperature sensor in charge air
pipe
B611 Temperature sensor downstream of
air filter (only for code (M5Z)
Engine version Euro VI)
B617 Charge air temperature sensor in
charge air housing
– This printout will not be recorded by the update service. Status: 09 / 2011 –
The engine management (MCM) control unit (A4) also ensures
that the fuel is injected at exactly the right point in time and in
the correct amount into the cylinders through exact, electrical
actuation of fuel injectors for cylinder 1 to 6 (Y608 to Y613).
B621 Exhaust gas recirculation (AGR)
differential pressure sensor
B622 Rail pressure sensor
B638 Fuel filter module pressure sensor
CAN 4 Drive train CAN
S600 Engine start and engine stop
button
Y621 Exhaust gas recirculation positioner
The specified torque, which is calculated by the drive control (CPC)
control unit (A3) from (among other things) the position of the
accelerator pedal, is routed over the drive train CAN (CAN 4) to
the engine management (MCM) control unit (A4), which in turn
sends the current engine torque and the maximum torque
possible to the drive control (CPC) control unit (A3).
The drive train CAN (CAN 4) and the drive control (CPC) control
unit (A3) can also be used to exchange information with other
electronic systems or control units.
Functions
2.8.11
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