ME-SFI lambda control, function - FI lambda control, function - GF07.61-P-4022BK
ENGINES 113.967 in MODEL 219
ENGINES 113.964 in MODEL 164.1 up to model year 2008/AEJ 07
ENGINES 113.971 in MODEL 251 up to model year 2008/AEJ 07
Shown on model 219
The mixture composition is maintained within limits as close as possible to λ=1 in order to achieve a high conversion of the exhaust gases in the catalytic converter.
The O 2 sensors upstream of the catalytic converter the oxygen concentration in the exhaust and transmit corresponding signals to the ME-SFI [ME] control unit. This changes the mixture composition so that in all engine operating statuses, the desired oxygen (usually λ=1) is set.
This procedure is repeated (control loop), the control speed is dependent on engine load and speed.
The lambda closed-loop control is operational in the following operating conditions (closed-loop control):
- Coolant temperature > approx. -10°C,
- Blocking time after starting expired
- O2 sensors upstream CAT have reached operating temperature
Lambda control loop
Assuming a leaner air/fuel mixture is produced. The consequence of this is that the O2 sensor voltage drops and the ME-SFI [ME] control unit compensates for this lean drift by enriching the mixture accordingly.
This makes it possible to achieve an air/fuel composition 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 towards +25 %, the leaner is the air/fuel mixture and the greater is the enrichment of the mixture on the part of the ME-SFI [ME] control unit.
| Component description for ME-SFI [ME] control unit | GF07.61-P-6000BK | ||
| Component description for O 2 sensors | GF07.04-P-6100BK | ||
| Component description for crankshaft position sensor | GF07.04-P-6010BK | ||
| Component description for hot film mass air flow sensor | GF07.07-P-6000BK | ||
| Component description for coolant temperature sensor | GF07.04-P-6040BK | ||
| Component description for accelerator pedal sensor | GF30.20-P-2010BK | ||
| Component description for three-way catalytic converter | GF07.03-P-6010BK | ||
| Self-adjustment of mixture formation, function | GF07.10-P-1029BK | ||
| ME-SFI two-sensor control, function | GF07.61-P-3020BK | ||
| Component description for three-way catalytic converter | GF49.10-P-2010BK |