GF07.61-P-3022V ME-SFI Warming-Up Control, Function

GF07.61-P-3022V ME-SFI Warming-Up Control, Function











After start and post-start enrichment the fuel-air mixture is further enriched by the warming-up control as part of the fuel-air mixture precipitates on the parts of the engine which are still cold. An additional quantity of fuel is added to the engine by the ME-SFI [ME] control unit in line with the performance map. As soon as it is enabled, the Lambda control monitors the enrichment rate.

At close to idle operation, the enrichment rate is mainly dependent on the coolant temperature at start. At partial load, the air mass is decisive.

The camshaft position determines the exhaust gas recirculation rate via the duration of the valve overlap. As the hot exhaust gases warm up the combustion chamber, the fuel vaporization changes and the enrichment rate must be tuned to match it.

The coolant is controlled by the three-disk thermostat in such a way that it is warmed as quickly as possible.

During warm-up, the ignition angles are determined from a particular performance characteristic.

The warming-up enrichment is dependent on:
- Coolant temperature
- Intake air temperature
- Engine speed
- Engine load
- Idle speed/part load operation
- Camshaft position
- Correction programming with STAR DIAGNOSIS