Gasoline Injection And Ignition System With Direct Injection, Function - GF07.70-P-0002MND
Engine 276.8 in model 213, 238 up to model year 2021
Networking via direct lines
CAN cross-linking
Gasoline injection and ignition system with DI, general
The gasoline injection and ignition system with direct injection forms the engine management "MED 17.7.3" in the electrical network with the sensors and actuators of the engine. The short designation MED 17.7.3 means:
- M = Motronic
- E = Electronic accelerator
- D = Direct injection
- 17.7.3 = version 17.7.3
The whole engine management is contained in the ME-SFI control unit. Sensor data are read in directly by the engine management and indirectly via the CAN network and the respective actuators are actuated. Here the individual functions and systems of the engine management are controlled and coordinated by the ME-SFI control unit.
The engine management is subdivided into the following systems:
- Basic functions
- Engine management
- Fuel injection system
- Ignition system
- Exhaust system
- Exhaust gas recirculation (with code 920 (Gasoline direct injection with stratified charge))
Basic functions
- Control unit diagnosis
- Fault memory
- European On-Board Diagnosis
- Control module programming
- Transport mode
- Variant coding
- DAS stage 4 (FBS 4)
- Torque coordination
- Heat management
- Alternator interface
- Maximum vehicle speed limit
Diagnosis
For diagnostic purposes, the fault codes of the engine management can be read out and deleted with a vehicle diagnosis system, and individual diagnostic functions can be actuated in a targeted manner.
- Boost pressure control (over wastegate)
- Regulated adjustment of the intake and exhaust camshafts
- Controlling the ECO start/stop function
Fuel injection system
- Cylinder-selective DI
- Gasoline high pressure regulation
- Start, post-start phase and acceleration enrichment
- Warm-up control
- Idle speed control
- Limp-home function
- Inertia fuel shutoff
- Fuel pump controlling (low fuel pressure)
- Altitude adaptation (integral pressure sensor in ME-SFI control unit)
- Load change function
- Rpm limitation
Ignition system
- Multi-spark ignition
- Rpm limitation
- Knock sensor system
- Synchronization of camshaft and crankshaft position
Exhaust system
- Catalytic converter heating
Control module programming
The engine management in the ME-SFI [ME] control unit can be programmed, i. e., the control unit software can be exchanged (replaced) with a vehicle diagnosis system. The software required for control unit programming can be found on the diagnosis system software DVD.
Transport mode
In transport mode various functions of the engine management are limited.
If the vehicle's kilometer reading is more than 250 km, the "transport mode" system status is deactivated automatically and cannot be reactivated anymore using the vehicle diagnosis system.
Variant coding
The vehicle model, national version, exhaust variant and transmission version, for example, can be coded with variant coding.
Engine management
- Starter relay actuation
- Throttle valve control
- Safety fuel shutoff
- Transmission overload protection
- Support for ESP®
- Fully integrated transmission control support
- Driving on torque limitation
- Oxygen sensor heater controlling
- Straight-line lambda control
- Gasoline particulate filter (with code 598 (Gasoline particulate filter (GPF) with sensor system))
Engine 276.8 in model 213, 238 up to model year 2021 with code U21 (AMG Performance exhaust system) For optimization of the exhaust noise behavior of the exhaust system there is an electrically actuated exhaust flap installed on the left rear muffler.
This is actuated by the left exhaust gas flap actuator motor in a load-dependent manner and via a characteristics map of the respective drive program by the powertrain control unit. For the actuator motor in the powertrain control unit there is an own software stored which allows stepwise opening. The exhaust gas flap actuator motor is diagnosis capable. If the exhaust gas flap can not be opened, the engine output is reduced.
Exhaust gas recirculation (with code 920 (Gasoline direct injection with stratified charge))
- Controlling the exhaust gas recirculation valves
- NOx storage catalytic converter purging
Homogeneous operation
In homogeneous mode an homogeneous combustible fuel/air mixture (λ = 1) is generated within the whole combustion chamber. There are no further measures required for exhaust aftertreatment since the normal three-way catalytic converter adequately converts the pollutants.
During stratified operation, a combustible mixture (λ = 1) is present only in the vicinity of the spark plug while various lambda values are present in the remaining combustion chamber. This varies from pure intake air through to exhaust gases from the EGR. Thus fuel consumption in stratified operation is less than that in homogeneous mode. Due to the excess air, which consists of up to approx.75 % of nitrogen, the development of NOx in stratified charge operation is significantly higher than in homogeneous injection operation. This requires use of a NOx storage catalytic converter. More favorable exhaust emission values can be achieved in homogeneous injection/stratified charge operation at an injection pressure above 4 bar than in pure stratified charge operation. At the same time, it allows an injection pressure up to above 7 bar, whereby significant savings in fuel consumption are achieved. Homogeneous injection/stratified charge operation is a combination of the homogeneous lean and classic stratified combustion systems. Here, with a non-derated engine, the first injection is injected in the intake stroke; the actual "layer" injection takes place before ignition.
| Starting, function | GF07.10-P-1001MND | ||
| Fuel supply, function | GF07.10-P-1003MND | ||
| Injection regulation, function | GF07.10-P-1004MND | ||
| Ignition system function | GF07.10-P-1005MND | ||
| Synchronize fuel injection and firing order function | GF07.10-P-1006MND | ||
| Start, post-start phase and warm-up enrichment, function | GF07.10-P-1007MND | ||
| Rpm control, function | GF07.10-P-1008MND | ||
| Alternator interface function | GF07.10-P-1009MND | ||
| Lambda control, function | GF07.10-P-1010MND | ||
| Smooth running control, function | GF07.10-P-1011MND | ||
| Thermal management, function | GF07.10-P-1012MND | ||
| Torque coordination, function | GF07.10-P-1013MND | ||
| Overrun mode fuel shutoff, function | GF07.10-P-1014MND | ||
| Knock control, function | GF07.10-P-1015MND | ||
| Camshaft adjustment, function | GF07.10-P-1016MND | ||
| Engine limp-home mode, function | GF07.10-P-1019MND | ||
| European OBD, function | GF07.10-P-1021MND | ||
| Ignition, function | GF07.10-P-1023MND | ||
| ECO start/stop function engine management, function | GF07.10-P-1042MND | ||
| Charging, function | GF09.00-P-2000MND | ||
| Exhaust treatment function | GF14.00-P-3000MND | ||
| Exhaust gas recirculation, function | Engine 276.8 in model 213, 238 up to model year 2021 with code 920 (Direct fuel injection with stratified charging) | GF14.20-P-3000MND | |
| Electronic accelerator function | GF30.20-P-3015MND | ||
| On-board refueling vapor recovery function | Engine 276.8 in model 213, 238 up to model year 2021 with code 494 (US version) | GF47.10-P-3004MND | |
| Purging function | GF47.30-P-3015MND | ||
| Purge system with leak test, function | Engine 276.8 in model 213, 238 up to model year 2021 with code 494 (US version) | GF47.30-P-3017MND | |
| Overview of system components for gasoline injection and ignition system with direct injection | GF07.70-P-9998MND |