GF07.61-P-4009AM ME-SFI Synchronization of Fuel Injection and Firing Order, Function

GF07.61-P-4009AM ME-SFI Synchronization of Fuel Injection and Firing Order, Function
ENGINE 113.990 in MODEL 211, 219
ENGINE 113.991 in MODEL 215, 220
ENGINE 113.992 in MODEL 230 up to Model Year 2008
ENGINE 113.993 in MODEL 463 up to 31.5.12
ENGINE 113.995 in MODEL 230 up to Model Year 2008





B6/1 Camshaft Hall sensor
L5 Crankshaft position sensor
N3/10 ME control unit
R4 Spark plugs
T1/1-
T1/8 - Cylinder 1 to 8 ignition coils
Y62 Fuel injection valves

When the engine is started, the injection sequence in line with the firing order is defined on the basis of the signals supplied by the crankshaft position sensor and the camshaft Hall sensor.





Signal assignment

1 Crankshaft angle
2 Cylinder ignition TDC
3 Signal of crankshaft position sensor
4 Camshaft Hall sensor signal
5 Engine speed signal "TNA"

a Recognition of top dead center for cylinder 1 or 6

When the crankshaft is rotating, an alternating voltage is generated in the crankshaft position sensor by the teeth of the driven plate. During this operation, each tooth generates an alternating voltage signal. No voltage is generated as a result of the gap created by 2 missing teeth.
The engine control unit detects the TDC position of cylinders 1 and 6 with the 2nd negative slope after the gap.

If, at this moment, the signal from the camshaft Hall sensor is at 0 volt ("low") the ME control unit processes this in order to detect ignition TDC of cylinder 1.

Synchronization of the injection and firing order is processed by the ME-SFI control unit for actuation of the ignition coils and the fuel injection valves.

In addition the synchronization is required for the anti-knock control and the fuel cut-off on the individual cylinders.