Gasoline Injection And Ignition System With Direct Injection, Function - GF07.70-P-0002MRD
Engine 274.9 in model 213 (except 213.050/053/153), 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 in electrical combination with the sensors and actuators of engine 274 (direct injection) forms the engine management system "MED40". The short designation "MED40" stands for:
M = Engine
E = Electronics
D = Direct injection
4 = 4 cylinder
0 = generation 0
The whole engine management is contained in the ME-SFI control unit. Sensor data are read in directly by the engine management and i directly 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 system
- 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
- Diagnosis via CAN
- CAN network
- Control module programming
- Transport mode
- Variant coding
- Drive authorization system stage 4 (DAS 4)
- Torque coordination
- Heat management
- Alternator interface
- Maximum vehicle speed limit
Diagnosis
For diagnostic purposes, the fault codes of the engine management system can be read out and deleted using a vehicle diagnosis system, and individual diagnostic functions can be specifically actuated.
Flash programming
Engine management in the ME-SFI control unit is flashable. The ME-SFI control unit's software can be exchanged (replaced) using a vehicle diagnosis system. The software required for programming can be found on the diagnosis 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 the variant coding.
Engine system
- Starter relay actuation
- Throttle valve control
- Safety fuel shutoff
- Transmission overload protection
- Support for ESP®
- Fully integrated transmission control support (transmission 725)
- Driving on torque limitation
- Fan operation
- Throttle valve calibration
- Boost pressure control (over wastegate)
- Regulated adjustment of the intake and exhaust camshaft
- 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
- Rpm increase for an activated A/C
- 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
- Ignition map
- Rpm limitation
- Knock sensor system
- Synchronization of camshaft and crankshaft position
Exhaust system
- Catalytic converter heating
- Oxygen sensor heater controlling
Exhaust gas cleaning, exhaust gas recirculation (with code 920 (gasoline direct injection with stratified charge))
- Closed-loop control of the exhaust gas recirculation valve
- Straight-line lambda control
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 left exhaust gas flap actuator motor, a separate software is stored in the powertrain control unit that allows for a gradual opening.
- Purging the NOx storage catalytic converter
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 gas 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 that consists of up to 75% of nitrogen, NO x development in stratified operation is significantly higher than in homogeneous injection operation. This requires use of a NOx storage catalytic converter.
In homogeneous stratified operation, more favorable exhaust emission values can be achieved above 4 bar injection pressure than in pure stratified charge operation. It also allows injection pressure of up to above 7 bar, which achieves significant savings in fuel consumption. Homogeneous stratified operation is a combination of the homogeneous/lean and classic stratified combustion system. In the process, for a non-derated engine, the first injection is injected in the intake stroke; the actual "stratified" injection takes place before ignition.
| Crankcase ventilation system, function | GF01.20-P-0001MRD | ||
| Ignition, function | GF07.10-P-1023MRD | ||
| Starting, function | GF07.10-P-1001MRD | ||
| Fuel supply, function | GF07.10-P-1003MRD | ||
| Injection regulation, function | GF07.10-P-1004MRD | ||
| Ignition system function | GF07.10-P-1005MRD | ||
| Synchronize fuel injection and firing order function | GF07.10-P-1006MRD | ||
| Start, post-start phase and warm-up enrichment, function | GF07.10-P-1007MRD | ||
| Rpm control, function | GF07.10-P-1008MRD | ||
| Alternator interface function | GF07.10-P-1009MRD | ||
| Lambda control, function | GF07.10-P-1010MRD | ||
| Smooth running control, function | GF07.10-P-1011MRD | ||
| Thermal management, function | GF07.10-P-1012MRD | ||
| Torque coordination, function | GF07.10-P-1013MRD | ||
| Overrun mode fuel shutoff, function | GF07.10-P-1014MRD | ||
| Knock control, function | GF07.10-P-1015MRD | ||
| Camshaft adjustment, function | GF07.10-P-1016MRD | ||
| Engine limp-home mode, function | GF07.10-P-1019MRD | ||
| European OBD, function | GF07.10-P-1021MRD | ||
| ECO start/stop function engine management, function | GF07.10-P-1042MRD | ||
| Charging, function | GF09.00-P-2000MRD | ||
| Exhaust treatment function | GF14.00-P-3000MRD | ||
| Exhaust gas recirculation, function | Engine 274.9 in model 213 (except 213.050/053/153), 238 up to model year 2021 with code 920 (Direct fuel injection with stratified charging) | GF14.20-P-3000MRD | |
| Electronic accelerator function | GF30.20-P-3015MRD | ||
| On-board refueling vapor recovery function | Engine 274.9 in model 213 (except 213.050/053/153) up to model year 2021 with code 494 (US version) | GF47.10-P-3004MRD | |
| Purging function | GF47.30-P-3015MRD | ||
| Purge system with leak test, function | Engine 274.9 in model 213 (except 213.050/053/153) up to model year 2021 with code 494 (US version) | GF47.30-P-3017MRD | |
| Overview of system components for gasoline injection and ignition system with direct injection | GF07.70-P-9998MRD |