System mangement strategies (page 2 of 2)

The injection management strategies are designed to provide the engnie with the correct quantity of fuel at the desired time according to the engine operating conditions.

NOTE The presence of the flow meter allows the direct measurement of the mass of air drawn in, making the presence of the intake air temperature sensor superfluous.

The management of the injection basically consists of calculating the injection time, determining the injection phase and the subsequent implementation via the operation of the injector.
The "basic" injection time depends on the specifications of the injector and corresponds to the quantity of fuel to be injected into each cylinder. The latter is, in turn, determined by multiplying the quantity of air drawn in by each cylinder (calculated on the basis of the quantity of intake air and the engine rotation speed) for the desired mixture strength in relation to the engine operating point.
The final injection time is determined by means of a calculation algorhythm in which the "basic" time is corrected by a series of coefficients which take into account the different engine operating conditions which are highlighted by the various sensors present in the system.

4F00BQJ01
A: "basic" injection time
B: correction coefficient:
    low engine temperature
    high engine temperature
    starting and post-starting
    butterfly fully open
    deceleration
    acceleration
C: feed-back mixture control
D: self-adjustment
E: cut-off
F: intermediate injection time
G: extra-pulse
H: non phased injection management