ME-SFI Part Load/Full Load Operation Function

ME-SFI Part Load/full Load Operation Function




Shown on Engine 119
B2/5 Hot film mass air flow sensor
B11/4 Coolant temperature sensor
B17 Intake air temperature sensor
B37 Accelerator pedal sensor
G3/3 Left O2 sensor upstream of TWC
G3/4 Right oxygen sensor upstream TWC [KAT]
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 Injectors (LH-SFI, HFM-SFI, PEC [LH, HFM, PMS]

Task
Partial load operation: when engine is at normal operating temperature ensure, together with lambda control, optimal exhaust emission values and low-cost fuel consumption.
Full load operation: ensure maximum engine torque when throttle valve is fully opened. The injection time is extended accordingly for this purpose.
Design/function
The respective quantity of fuel is metered to the engine in line with the map.

The fuel quantity is dependent on:
- Position of accelerator pedal sensor
- Air mass
- Boost pressure in supercharged engines
- Engine speed
- Engine load
- Coolant temperature
- Intake air temperature
- Charge air temperature in supercharged engines
- Lambda control
- Correction programming with HHT or STAR DIAGNOSIS