ME-SFI Acceleration Enrichment Function

ME-SFI Acceleration Enrichment Function




Shown on Engine 119
B2/5 Hot film mass air flow sensor
B11/4 Coolant temperature sensor
B37 Accelerator pedal sensor
L5 Crankshaft position sensor
M16/1 Electronic accelerator (EA)/ cruise control (CC)/ idle speed control (ISC) actuator
N3/10 ME-SFI control unit
X11/4 Data link connector
Y62 Fuel injector Cylinder 1-8

Task
Preventing acceleration jerks

Design/function
If the throttle valve was opened rapidly when accelerating, a leaner mixture is produced for a short time. An additional quantity of fuel is metered to the engine in line with the map. This is achieved by actuating the injectors with additional pulses.

Acceleration enrichment is dependent on:
- Coolant temperature
- Load change speed (accelerator speed)
- Engine speed
- Engine load
- Correction programming with HHT or STAR DIAGNOSIS