P07.08-2378-79
Example illustration of engine 256 |
1 | Combustion engine control unit |
Overview
This document contains information on:
General
Function
General
The combustion engine control unit is the central control unit for the engine management functions. It also performs gateway functions for other control units.
The combustion engine control unit is located in the engine compartment, usually on the combustion engine.
Function
The combustion engine control unit intervenes in the following functions:
Engine management
Fuel system (fuel supply system, mixture formation, fuel preheating)
Heat management
Exhaust aftertreatment
Charging
To execute these functions, the combustion engine control unit basically processes the following input factors:
High-pressure side fuel pressure (fuel distribution)
Low-pressure side fuel pressure
Throttle valve position
Fuel temperature
Boost pressure
Charge air temperature
Coolant temperature
Soot particulate filter pressure differential
Crankshaft position
Position of the camshaft
Oil pressure
Oil level, oil temperature, oil quality
Low-pressure side exhaust gas recirculation temperature
Position of low-pressure side exhaust gas recirculation actuator
Position of high-pressure exhaust gas recirculation actuator
Air mass
Crash signal
The combustion engine control unit processes these input factors and basically transmits the following actuations:
Throttle valve actuator
Divert air switchover valve
Fuel injectors
For diesel engines: glow output stage
Boost pressure control flap
Low-pressure/high-pressure exhaust gas recirculation actuator
Quantity control valve
Alternator
Components | |||
Pressure sensor downstream of air filter, basic function | Engine all (CAR) | ||
Intake manifold pressure sensor, basic function | Engine 282 | ||
Pressure sensor upstream of throttle valve, basic function | Engine 282 | ||
Hot film mass air flow sensor, basic function | Engine 608, 654, 656 | ||
Charge air pressure and temperature sensor, basic function | Engine 139, 177, 254, 256, 260, 264, 279, 608 | ||
Charge air temperature sensor downstream of throttle valve, basic function | Engine 282 | ||
Boost pressure control flap actuator, basic function | Engine all (CAR) | ||
Camshaft Hall sensor, basic function | Engine all (CAR) | ||
Integrated starter alternator, basic function | Model all (CAR) | ||
Engine oil temperature sensor, basic function | Engine 133 | ||
Basic function of engine oil pressure and temperature sensor | Engine 139 |