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

ENGINE 642.8 in MODEL 207 as of 6/1/13, 212, 218 as of 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 RPM range from approx. 750 to 2600 RPM.

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

IMPORTANT The CDI control unit receives the displayed fuel level message over chassis CAN 1, routed from the front SAM control unit with fuse and relay module (N10/1), which receives the message on chassis CAN 2 (CAN E2) from the instrument cluster.

Function sequence for smooth running control 

The function sequence is described in the following steps:

Function sequence for combustion misfire detection 

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 period via actuation of the fuel injectors (Y76).

IMPORTANT The fuel pressure in the rails and the injection period 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 drivetrain may have a negative effect on evaluation of the engine running at certain engine speeds and load conditions. Therefore, the tolerance range for smooth running analysis is increased on poor road surfaces.

The CDI control unit receives the wheel speed signal (for detection of even wheel rotation) via chassis CAN 1 from the ESP® control unit.

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 via the interior CAN (CAN B) to the instrument cluster. The CDI control unit receives the fuel level information from the instrument cluster via chassis CAN 1.

IMPORTANT The CDI control unit receives the displayed fuel level message over chassis CAN 1, routed from the front SAM control unit with fuse and relay module, which receives the message on the chassis CAN 2 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 ENGINE 642.8 in MODEL 207 as of 6/1/13 as of model year 2014 PE07.10-P-2711-97EAJ
ENGINE 642.8 in MODEL 212 as of model year 2014 PE07.10-P-2711-97DAM
ENGINE 642.8 in MODEL 218 as of model year 2014 PE07.10-P-2711-97XAE
  Overview of system components for common rail diesel injection (CDI)   GF07.16-P-9997OG
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