ME-SFI lambda control, function - GF07.61-P-4022V
ENGINE 272.920 in MODEL 203
ENGINE 272.922 in MODEL 211
ENGINE 272.940 in MODEL 203, 209
ENGINE 272.941 in MODEL 203
ENGINE 272.942 in MODEL 171
ENGINE 272.943 in MODEL 211
ENGINE 272.944 in MODEL 211
ENGINE 272.945 in MODEL 251
ENGINE 272.946 in MODEL 221
ENGINE 272.960 in MODEL 203, 209
ENGINE 272.963 in MODEL 171
ENGINE 272.964 in MODEL 211, 219
ENGINE 272.965 in MODEL 221
ENGINE 272.966 in MODEL 230
ENGINE 272.967 in MODEL 164, 251
ENGINE 272.970 in MODEL 203
ENGINE 272.972 in MODEL 211
ENGINE 272.975 in MODEL 221
ENGINE 273.922 in MODEL 221
ENGINE 273.923 in MODEL 164
ENGINE 273.924 in MODEL 221
ENGINE 273.943 in MODEL 164
ENGINE 273.960 in MODEL 211, 219
ENGINE 273.961 in MODEL 216, 221
ENGINE 273.962 in MODEL 211
ENGINE 273.963 in MODEL 164, 251
ENGINE 273.965 in MODEL 230
ENGINE 273.967 in MODEL 209
ENGINE 273.968 in MODEL 221
Shown on engine 272
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 O2 sensors detect the oxygen share 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 TWC 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 the ME-SFI [ME] control unit | GF07.61-P-6000V | ||
| Component description for the | O2 sensors | O2 sensors upstream of the TWC GF07.04-P-6100V | |
| O2 sensors downstream of the TWC | GF07.04-P-6100VA | ||
| Component description for the crankshaft Hall sensor | GF07.04-P-6220V | ||
| O2 sensor heater, function | GF07.61-P-3025V | ||
| Component description for the hot film mass air flow sensor | GF07.07-P-6000V | ||
| Component description for the coolant temperature sensor | GF07.04-P-6040V | ||
| Self-adjustment of mixture formation, function | GF07.61-P-3030V | ||
| Component description for the accelerator pedal sensor | GF30.20-P-2010V | ||
| Component description for the fuel injection valves | GF07.03-P-6010V | ||
| ME-SFI two-sensor control, function | GF07.61-P-3020V | ||
| Component description for the three-way catalytic converter | GF49.10-P-2010V |