ME-SFI lambda control, function engine 113 - GF07.61-P-4022SM
ENGINE 113.986
ENGINE 113.987
ENGINE 113.988
ENGINE 113.989
The mixture composition is controlled within the narrowest possible limits around λ = 1 in order to achieve a high conversion of the exhaust gases (exhaust gas conversion) in the catalytic converter.
The O2 sensors (G3/3, G3/4) react to the oxygen share in the exhaust and transmit a corresponding voltage signal to the ME control unit (N3/10). This alters the mixture composition by controlling the injection quantity so that λ=1 is obtained. This process is repeated constantly (control loop).
The lambda closed-loop control is operational in the following operating conditions (closed-loop control):
- Coolant temperature < 52°C
- O2 sensors have reached operating temperature
- Engine in idle/partial load range
- Deceleration fuel shutoff not active.
The ME control unit alters the mixture composition with a time delay in order to prevent any risk of jerking.
Example:
Assuming a leaner fuel-air mixture is produced. This has the following consequence, that the O2 sensor voltage drops and the ME control unit compensates for this lean drift through a matching enrichment.
This makes it possible to achieve a fuel-air mixture of approximately λ = 1.
The reading of the lambda control factor with the STAR DIAGNOSIS moves towards +25 % The more the lambda control factor moves in the direction +25 %, the leaner is the fuel-air mixture and the greater is the enrichment of the mixture on the part of the ME control unit.
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