Mercedes-Benz OM 471 Introduction Into Service Manual page 62

General information
The target engine torque is a value that is calculated by the drive
control control unit (CPC) (A3).
This value represents the driver request (e.g. accelerate) taking
the current driving status into consideration.
The drive control control unit (CPC) (A3) provides the engine
management control unit (MCM) (A4) with the current target
engine torque for calculating the relevant variables for the engine
timing.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
The maximum available engine torque is evaluated in addition to
this information. The information concerning the maximum
available engine torque is provided by the engine management
control unit (MCM) (A4).
The engine management control unit (MCM) (A4) evaluates the
current coolant temperature, the fuel temperature and the
engine rpm to do this.
The engine management control unit (MCM) (A4) then sends the
maximum available engine torque to the drive control control
unit (CPC) (A3).
Drive control (CPC) control unit,
component description
Engine management control unit (MCM),
component description
Electronic Brake Control control unit (EBS),
component description
Exhaust aftertreatment (ACM) control unit,
component description
Travel and speed sensor, component
description
Accelerator pedal sensor, component
description
Tachograph (TCO) component description
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >
– This printout will not be recorded by the update service. Status: 09 / 2011 –
Function
The drive control control unit (CPC) (A3) determines the current
position of the accelerator pedal from the PWM (Pulse Width
Modulated) signal of the accelerator pedal sensor (B44). As well as
the accelerator pedal position, the drive control control unit (CPC)
(A3) evaluates additional information, which can limit the target
engine torque depending on the situation:
f Anti>lock braking system (ABS)
(braking torque) status
f Acceleration skid control (ASR)
(engine torque) status
f Electronic Stability Program (ESP") (braking torque) status
f Vehicle speed
f Status of driver assist systems (e.g. Proximity Control Assist,
with code (S1l) Proximity Control Assist)
f Exhaust aftertreatment status
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
The drive control control unit (CPC) (A3) uses the sum total of the
listed information to calculate the relevant target engine torque.
The drive control control unit (CPC) (A3) transmits this request to
the engine management control unit (MCM) (A4), which then
calculates the variables for the injection quantity.
i The calculated target engine torque is output as a positive
value. If the accelerator pedal is not operated, the target engine
torque is specified as "0", and in deceleration mode the target
engine torque is shown as a negative value.
A3
A4
A10b, A10c
A60
Vehicles with code (M5R) Engine version
EEV and vehicles with code (M5Y) Engine
version Euro V
Vehicles with code (M5Z) Engine version
Euro VI
B18
B44
P1
Functions
Page 102
Page 103
Page 105
Page 117
Page 119
Page 131
Page 134
Page 163
59