- a) synchronous injection, in which the basic injection duration is adjusted according to the signals of the sensors so that fuel injection always occurs at a certain position of the crankshaft;
- b) asynchronous injection, in which fuel is injected when requests are detected by sensor signals, regardless of the angle of rotation of the crankshaft.
Pic. 2.210. EFI system diagram (Electronic fuel injection system)
In addition, to protect the engine and improve fuel economy, the system performs a fuel cut, which stops fuel injection temporarily according to driving conditions.