Combustion Engine Control Unit, Basic Function - GF07.08-S-9890A

Engine All (Light transporter) 

Courtesy of MERCEDES-BENZ USA

Example combustion engine control unit 

Overview 

This document contains information on:

• General 
• Function 

General 

The combustion engine control unit (1) is the central control unit for the engine management functions. It also performs gateway functions for other control units.

The combustion engine control unit (1) is located in the engine compartment e.g. on the combustion engine.

Function 

The combustion engine control unit (1) intervenes in the following functions:

• Engine management
• Fuel system
  • Fuel supply
  • Mixture formation
  • Fuel preheating system
• Heat management
• Exhaust aftertreatment
• Charging

In order to carry out these functions, the combustion engine control unit (1) primarily 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 (1) 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