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Smooth running control, function - GF07.10-P-1011OG

ENGINE 642.8 in MODEL 204 

ENGINE 642.8 in MODEL 207 up to 5/31/13, 212, 218 up to model year 2014 

Function requirements for smooth running control, general points 

Smooth running control, general points 

Smooth running control reduces any rough running in the engine RPM range from 750 to 2600 RPM.

For smooth running evaluation, the CDI control unit (N3/9) reads in the following sensors and signals:

IMPORTANT The Electronic Stability Program control unit (N30/4) will be used as of 1.3.2011 (model 204.0/2.) in 2 variants:

Until 28.2.2011 (model 204.0/2.) or 31.5.2011 (model 204.9) and as of 1.6.2011 (model 204.9), only the basic variant of the Electronic Stability Program control unit will be used.

Function sequence for smooth running control 

The function sequence is described in the following steps:

Function sequence for recognition of combustion misfires 

Here the CDI control unit reads in the signal from the crankshaft Hall sensor and evaluates its regularity. If irregularities are found on the crankshaft Hall sensor signal, the CDI control unit corrects the fuel pressure in the rails via the pressure regulating valve (Y74) and the quantity control valve (Y94) and the injection time via actuation of the fuel injectors (Y76).

IMPORTANT The fuel pressure in the rails and the injection timing of the fuel injectors combine to produce a specific injection quantity.

Function sequence for factors for smooth running control 

The following factors affect smooth running control:

Recognition of road bumps 

Vibrations transmitted through the drive train may have a negative effect on engine running at certain engine speeds and load conditions. Therefore, the tolerance range for smooth running analysis is increased on poor road surfaces ("wash board").

The CDI control unit receives the wheel speed signal (for detection of uniform wheel rotation) from the Electronic Stability Program control unit over the chassis CAN.

Fuel reserve signal 

The SAM control unit with rear fuse and relay module (N10/2) evaluates the signals from the LH and RH fuel level indicator sensors (B4/1, B4/2) and sends the corresponding signal over the body CAN (CAN B) to the instrument cluster.

The CDI control unit receives information about the fuel level via the chassis CAN from the instrument cluster.

Sensor adaptation 

The tolerance range for smooth running analysis is reduced after successful adaptation of the crankshaft Hall sensor.

In this way, the smooth running analysis can be adapted to the specific smooth running characteristics of the engine.

The CDI control unit stores the smooth operation characteristics of the engine during a deceleration phase (accelerator pedal not operated) when uniform smooth operation is present.

These are required as a comparison parameter for misfire detection. The tolerance range for smooth running analysis is preset in the CDI control unit and can be adapted using Xentry Diagnostics if necessary.

  Electrical function schematic for smooth running control MODEL 204 PE07.10-P-2711-97FAH
  Electrical function schematic for smooth running control MODEL 207 PE07.10-P-2711-97EAF
  Electrical function schematic for smooth running control MODEL 212 PE07.10-P-2711-97DAF
  Electrical function schematic for smooth running control MODEL 218 PE07.10-P-2711-97XAA
  Overview of system components for common rail diesel injection (CDI)   GF07.16-P-9997OG
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