GF07.16-P-0001OGG Common Rail Diesel Injection (CDI), Function

GF07.16-P-0001OGG Common Rail Diesel Injection (CDI), Function
- as of model year 09


Common rail diesel injection (CDI) - general
The Common-Rail Diesel Injection (CDI) makes the engine control "CR-6+" in electrical connection with the sensors and actors for engine 642.

The abbreviated designation "CR-6+" means:
CR = Common-Rail
6+ = CDI 6 the fourth generation of diesel direct injection technology

"Common Rail" literally translated means "common line". The fuel upstream of the injection is stored in this common line. Therefore a Common-Rail-System is also called storage injection.
The so-called engine control is located in the CDI control unit (N3/9). Sensor data is directly read in from the engine control and indirectly via the CAN interconnection and actuates the respective actors. The individual functions and systems of the engine control are controlled and coordinated by the CDI control unit.

The following table represents the model and major assembly overviews:







The engine control is sub-divided into the following points:
^ Basic functions
^ Engine system
^ Injection system
^ Air controlling system
^ Exhaust system

Basic functions
- Control system diagnosis
- Fault memory
- On-board diagnosis II (OBD II)
- Diagnosis via the Control Area Network (CAN)
- CAN interconnection
- Flash programming
- Variant coding
- Drive authorization system 3 (DAS 3)
- Torque coordination
- Heat management
- Alternator interface
- Maximum vehicle speed limit
- Synchronization
- Load determination

Diagnosis
For diagnostic purposes, the Diagnosis Assistance System (DAS) can be used to read out and delete the engine control fault codes, and to actuate certain specific diagnostic functions.

CAN interconnection
The CDI control unit exchanges data via the attached engine compartment-CAN (CAN C) and drive train sensor CAN (CAN I) with other control units which are integrated in the CAN network.
The CDI control unit also acts as the interface (gateway) between the two CAN bus systems. The CDI control unit is also connected to the drive train LIN (LIN C1) and exchanges data over it.

Flash programming
The engine control in the CDI control unit is flash programmable, that is the complete software in the control unit can be replaced using the DAS (installed new). The software required for control unit programming can be found on the Star Diagnosis DAS Update DVD.

Variant coding
Using variant coding the following vehicle versions and equipment can be coded using the DAS:
- Vehicle model
- National version
- Exhaust variants
- Transmission version

Engine system
- Start relay actuation
- Throttle flap control
- Safety fuel shutoff
- Transmission overload protection
- Assist the Electronic Stability Program (ESP)
- Support for fully integrated transmission control (VGS)
- Starting torque limitation
- Anti-jerk control
- Suction fan actuation
- Alternator regulation
- Glow time control

Injection system
- Pre, main and post injection
- Idle speed control
- Smooth running control
- Limp-home function
- RPM increase of air conditioning
- Inertia fuel shutoff
- Rail pressure regulation
- Fuel pump control
- High-pressure pump control unit
- Altitude adaptation
- Rpm limitation

Air controlling system
- Exhaust gas recirculation (EGR)
- Charge pressure control
- Intake air throttling through intake port shutoff (EKAS)

Exhaust system
- Catalytic converter heating
- Oxygen sensor heater control unit
- Exhaust after treatment, DPF regeneration ( Diesel Particulate Filter) with code (474) Particulate filter
- Exhaust after treatment, injection of the reducing agent AdBlue(R) with code (U42) BlueTec (SCR) diesel exhaust gas cleaning

Engine 642.8 is characterized by the following components:
- V6 crankcase made out of aluminum instead of cast iron
- Balance shaft located in the "V" of both cylinder banks which turns in an opposite direction to the crankshaft
- Valve timing with roller-type cam followers
- Rapid glowing system with glow output stage (N14/3)
- A flow-dynamics optimized supercharging system consisting of a turbocharger with variable turbine geometry
- Exhaust gas recirculation with water-cooled exhaust gas recirculation cooler
- Highly efficient ventilation system with centrifugal oil separator
- Fuel injectors (Y76) with piezo technology
- Intake controlled high-pressure pump with lower than average operating energy input, leading to reduced fuel consumption

Exhaust emission standards
Engine 642.8 complies with the EU-5 exhaust emission standards. Vehicles with code (U42) BlueTec (SCR) diesel exhaust gas cleaning fulfill the EU-6 exhaust emissions standard or the BIN5 LEVII exhaust emissions standard of the USA with code (U42) BlueTec (SCR) diesel exhaust gas cleaning.

The operating conditions of the engine and the active partial functions of the engine control is described in the following documents:
^ Ignition ON function
^ Starting, function
^ Ignition OFF function
^ Fuel supply, function
^ Injection regulation, function
^ Rpm control, function
^ Alternator interface function
^ Smooth running control, function
^ Thermal management, function
^ Torque coordination, function
^ Deceleration fuel shutoff function
^ Engine limp-home mode, function
^ On-board diagnosis, function
^ Turbocharging, function
^ Emission control function
^ Exhaust gas recirculation, function
^ Preheat, function