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

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







When the engine is started, the injection sequence is defined on the basis of the firing order signals supplied by the crankshaft Hall sensor and the camshaft Hall sensors To do this, ignition TDC must be detected by cylinder 1.

The synchronization of the injection and firing order is further processed by the ME control unit for actuating the ignition coils and the fuel injection valves. In addition, it is required for the anti-knock control and for the fuel cutoff at individual cylinders.

If the camshaft Hall sensors are defective, a switchover to the next sensor will take place in a particular sequence. If there is no signal available then ignition occurs after a 360° crank angle and injection occurs in order to allow an emergency start.

When the engine is shut down, coasting detection takes place, which also evaluates turning back of the engine shortly before the engine is stationary. When the computer powers down, the position found is saved as ° crankshaft angle and used the next time the engine is started. If coasting detection does not provide a result, or the shutdown engine has been moved, synchronization takes place.