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

GF07.61-P-4009M ME-SFI Synchronization Of Fuel Injection And Firing Order, Function

Component Identification:

When the engine is started, the injection sequence is defined on the basis of the firing order signals supplied by the crankshaft position sensor and the camshaft Hall sensors
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 ME-SFI [ME] control unit detects the TDC position of cylinders 1 and 7 via the 2nd negative signal edge after the gap:

If, at this moment, the signal from the camshaft Hall sensor is still at 0 V ("low"), the ME-SFI [ME] control unit processes this information to detect the ignition TDC of cylinders 1 and 7.

Synchronization of the injection and firing order is further processed by the ME-SFI [ME] control unit for determination of the ignition timing and actuation of the Fuel injection valves. In addition, it is required for the anti-knock control, the ion current evaluation and for the fuel shutoff at individual cylinders.