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

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







When the engine is started, the injection sequence is defined on the basis of firing order signals supplied by the crankshaft Hall sensor and the camshaft Hall sensors

To do this the ignition TDC of cylinder 1 (see "a" picture below) must be recognized.

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

Furthermore synchronization is required for the knock control and the fuel shutoff on the individual cylinders.

When the engine is shut down, coasting detection takes place which also evaluates turning back of the engine shortly before the engine is stationary. In the computer run-on phase the found position is stored in a ° crank angle and used for the next engine start. If "coasting detection" does not provide a result, or the shutdown engine has been moved, synchronization of the injection and firing order takes place at engine start.

If a camshaft Hall sensors is defective, switchover to the next Hall sensor will take place in a particular sequence. If is absolutely no signal is available, ignition and injection takes place after a 360° crankshaft angle, thereby facilitating an emergency start.