GF07.70-P-0002MM Gasoline Injection and Ignition System With Direct Injection, Function

GF07.70-P-0002MM Gasoline Injection and Ignition System With Direct Injection, Function
ENGINES 276.9 in MODEL 204.0 /2 /3 /9, 207.3 /4, 212.0 /2, 218





Block diagram

A1 Instrument cluster
A1e4 Fuel reserve indicator lamp
A1e58 Engine diagnosis indicator lamp
A1p13 Multifunction display
A16/1 Right knock sensor
A16/2 Left knock sensor
B2/5 Hot film MAG sensor (on engine with stratified operation)
B2/5b1 Intake air temperature sensor (model 204, 207, 212), intake air temperature sensor (model 218) (for an engine with stratified operation)
B4/1 left fuel level indicator sensor (model 204, 207, 212), left fuel level indicator fuel tank fuel level sensor (model 218)
B4/2 Right fuel level indicator sensor (model 204, 207, 212), right fuel level indicator fuel tank fuel level sensor (model 218)
B4/3 Fuel tank pressure sensor (with code (494) USA version)
B4/31 Fuel quality sensor (for code (494) USA version) (for code (929) Flexible Fuel Vehicle (FFV))
B4/7 Fuel pressure sensor (model 204, model 207, model 212), fuel pressure sensor (model 218)
B4/25 Fuel pressure and temperature sensor
B6/4 Left intake camshaft Hall sensor
B6/5 Right intake camshaft Hall sensor
B6/6 Left exhaust camshaft Hall sensor
B6/7 Right exhaust camshaft Hall sensor
B11/4 Coolant temperature sensor (model 204, 207, 212), Coolant temperature sensor (model 218)
B11/15 Cooler sensor for engine diagnosis (for an engine without stratified operation, for code (494) USA version and code (917) Partial zero emission vehicle- emission USA)
B16 Right NOx storage catalytic converter temperature sensor (on engine with stratified operation)

B16/1 Left NOx storage catalytic converter temperature sensor (on engine with stratified operation)
B17 Intake air temperature sensor (model 204, 207, 212), intake air temperature sensor (model 218) (for an engine without stratified operation)
B17/1 Intake manifold intake air temperature sensor
B28/7 Pressure sensor downstream of throttle valve
B37 Accelerator pedal sensor
B64/1 Brake vacuum sensor (vehicles with code (B03) ECO start/stop function)
B70 Crankshaft Hall sensor
CAN B Interior CAN
CAN C Drive train CAN
CAN D Diagnostic CAN
CAN E Chassis CAN
CAN I Drive train sensor CAN
G1 On-board electrical system battery
G2 Alternator
G3/3 Left oxygen sensor upstream of catalytic converter
G3/4 Right oxygen sensor upstream of catalytic converter
G3/5 Left oxygen sensor downstream of catalytic converter
G3/6 Right oxygen sensor downstream of catalytic converter
L6/1 Left front axle speed sensor
L6/2 Right front axle speed sensor
L6/3 Left rear axle speed sensor
L6/4 Right rear axle speed sensor
LIN 1 Instrument panel LIN
LIN C1 Drive train LIN
M1 Starter
M3 Fuel pump
M4/7 Combustion engine and air conditioning with integrated control fan motor
M16/6 Throttle valve actuator
M16/45 AGR actuator motors (for an engine with stratified operation)
N2/10 Supplemental restraint system control unit (model 204, 207, 212), supplemental restraint system control unit (model 218)
N3/10 ME-SFI [ME] control unit
N10/1 Front SAM control unit with fuse and relay module
N10/1kJ Circuit 15 relay
N10/1kM Starter circuit 50 relay
N10/1kN Engine circuit 87 relay

N10/2 Rear SAM control unit with fuse and relay module
N22/7 Automatic air conditioning control and operating unit
N30/4 Electronic Stability Program control unit (except code (233) DISTRONIC PLUS) (model 207, 212, 218)
N30/7 Electronic Stability Program control unit Premium (for code (233) DISTRONIC PLUS) (model 207, 212, 218)

The Electronic Stability Program control unit (N30/4) will be introduced into service as of 1.3.2011 (model 204.0/2) or as of 1.6.2011 (model 204.3) in 2 variants:
- Electronic Stability Program (ESP) control unit, basis variant (except code (233) DISTRONIC PLUS)
- ESP control unit, Premium variant (with code (233) DISTRONIC PLUS)
As of 1.6.2011 only the basic variant of the Electronic Stability Program control unit will be used in model 204.9.

N37/5 Left nitrogen oxide control unit (on engine with stratified operation)
N37/5b1 LH NOx sensor (for an engine with stratified operation)
N37/6 Right nitrogen oxide control unit (on engine with stratified operation)
N37/6b1 RH NOx sensor (for an engine with stratified operation)
N51/3 AIRmatic control unit (with code (489) AIRMATIC (air suspension with continuously adjustable damping))
N62/2 Video and radar sensor system control unit (with code (233) DISTRONIC PLUS, with code (237) Active Blind Spot Assist, with code (238) Active Lane Keeping Assist), N69/1 Left front door control unit
N72/1 Upper control panel control unit
N73 Electronic ignition switch control unit
N80 Steering column module control unit
N118 Fuel pump control unit
R48 Coolant thermostat heating element
S9/1 Stop lamp switch
S40/4 Cruise control lever
S43 Oil level check switch
T1/1 Cylinder 1 ignition coil
T1/2 Cylinder 2 ignition coil
T1/3 Cylinder 3 ignition coil
T1/4 Cylinder 4 ignition coil

T1/5 Cylinder 5 ignition coil
T1/6 Cylinder 6 ignition coil
X11/4 Diagnostic connector
Y3/8 Fully integrated transmission control control unit
Y49/4 Left intake camshaft solenoid
Y49/5 Right intake camshaft solenoid
Y49/6 Left exhaust camshaft solenoid
Y49/7 Right exhaust camshaft solenoid
Y58/1 Purge control valve
Y58/4 Activated charcoal filter shutoff valve (with Code (494) USA version)
Y76/1 Cylinder 1 fuel injector
Y76/2 Cylinder 2 fuel injector
Y76/3 Cylinder 3 fuel injector
Y76/4 Cylinder 4 fuel injector
Y76/5 Cylinder 5 fuel injector
Y76/6 Cylinder 6 fuel injector
Y77/2 Intake manifold resonance flap switchover valve
Y77/3 Intake manifold selector drum switchover valve
Y84 Radiator shutters actuator
Y94 Quantity control valve
Y130 Engine oil pump valve

Gasoline injection and ignition system with direct injection, general points
The gasoline injection and ignition system with DI creates in an electrical combination with the sensors and actuators of engine 276 DE (Direct-Injection) the engine timing "MED 17.7.1".

The abbreviated designation MED 17.7.3 means:
M = Motronic
E = Electronic accelerator pedal
D = Direct injection
17.7.3 = Version 17.7.3

The ME-SFI [ME] control unit contains the whole engine control. The engine control system reads in sensor data both directly and via the CAN network and actuates the corresponding actuators. Here the individual functions and systems of the engine timing are controlled and coordinated by the ME-SFI [ME] control unit.

The following table represents the model and major assembly overviews for the engine 276:





The engine control is subdivided into the following systems:
^ Basic functions
^ Engine system
^ Injection system
^ Ignition system
^ Exhaust system

Basic functions
- Control unit diagnosis
- Fault memory
- On-board diagnosis II (OBD II)
- Diagnosis via CAN
- CAN network
- Flash programming
- Variant coding
- Drive authorization system stage 3 (DAS 3)
- Torque coordination
- Heat management
- Alternator interface
- Maximum vehicle speed limit

Diagnosis
For diagnostic purposes, the fault codes from the engine control can be read off and deleted with Xentry Diagnostics, and specific diagnostic functions initiated.

CAN network
The ME-SFI [ME] control unit exchanges data with other control units via the connected drive train CAN and chassis CAN which are integrated in the CAN network.
The ME-SFI [ME] control unit also acts as the interface (gateway) between the two CAN bus systems. The CDI control - Fault memory unit is also attached to the drive train sensor CAN (CAN I) and exchanges data via it.

Flash programming
The engine control in the ME-SFI [ME] control unit is flash programmable, that is the complete software in the control unit can be replaced using the Xentry diagnostics (replaced). The software required for control unit programming can be found on the Star Diagnosis software DVD.

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

Engine system
- Start relay actuation
- Throttle valve control
- Safety fuel shutoff
- Transmission overload protection
- Support for Electronic Stability Program (ESP)
- Support for fully integrated transmission control (VGS)
- Starting torque limitation
- Suction fan actuation
- Calibration of throttle valve
- Intake manifold switchover (selector drum and resonance flaps)
- Controlled adjustment of the intake and exhaust camshafts
- AGR (for an engine with stratified operation)
- Control of the engine start/stop function (for code (B03) ECO start/stop function)

Injection system
- Cylinder-selective DI (with homogeneous mode or homogeneous or stratified operation for an engine with stratified operation)
- Start, post-start phase and acceleration enrichment
- Warm running regulation
- Idle speed control
- Limp-home function
- Speed increase for air conditioning
- Inertia fuel shutoff
- Fuel pump control
- Altitude adaptation
- Load change function
- Rpm limitation

Ignition system
- Single and multi-spark ignition
- Ignition map
- Rpm limitation
- Knock sensor system
- Synchronization of camshaft and crankshaft positions

Exhaust system
- Catalytic converter heating
- Oxygen sensor heater control
- Straight-line lambda control
- Purging of the NOx storage catalytic converter (on engine with stratified operation)

Homogeneous mode (engine 276 DEH)
In homogeneous mode an homogeneous combustible air-fuel mixture (Lambda=1) is generated within the whole combustion chamber. There are no further measures required for exhaust after treatment since the normal 3-way CAT adequately converts the pollutants.

Stratified operation (engine 276 DES)
During stratified operation, a combustible mixture is present only in the vicinity of the spark plug (R4) various lambda values are present in the remaining combustion chamber (Lambda approximately equal to 1) This varies from pure intake air through to exhaust gases from the AGR. This causes the fuel consumption in stratified operation to be less than in homogeneous mode. Due to the excess air which consists of up to 75% by volume of nitrogen the NOx development in stratified operation is significantly higher than in homogeneous mode. This requires use of a NOx storage catalytic converter.

Homogeneous stratified operation (HOS)
The new operating mode HOS shows that it can deliver more favorable values in the range above 4 bar than pure stratified operation. It also allows use of homogeneous mode up to above 7 bar, whereby significant savings in fuel consumption are achieved. HOS is a combination of the homogeneous lean and classic stratified combustion process. For a unthrottled engine the first injection is sprayed in suction stroke while the actual "stratified" injection takes place before the ignition.
The following table presents the various different components on engine 276 for homogeneous mode (DEH) and stratified operation (DES):





The operating conditions of the engine and the concurrently active engine control subfunctions are described in the following documents:
^ Ignition ON, function
^ Starting, function
^ Ignition OFF, function
^ Fuel supply, function
^ Injection regulation, function
^ Ignition system function
^ Synchronize fuel injection and firing order function
^ Start, post-start phase and warm-up enrichment, function
^ Rpm control, function
^ Alternator interface, function
^ Lambda control, function
^ Smooth running control, function
^ Thermal management, function
^ Torque coordination, function
^ Deceleration fuel shutoff, function
^ Knock control, function
^ Camshaft adjustment, function
^ Intake manifold switchover, function
^ Engine limp-home mode, function
^ On-board diagnosis, function
^ Engine timing start stop function (for code (B03) ECO start/stop function)
^ Exhaust treatment, function
^ AGR function (for an engine with stratified operation)
^ Electronic accelerator function
^ Refueling gas recovery function (with code (494) USA version)
^ Purging function
^ System purging with leak test function (with code (494) USA version)