Corrections fuel dose corrections (discussed in the following pages)
AccEnrich acceleration enrichment
InjOpeningTime the time it takes for an injector to open from the time it has been
energized until it is fully open (value from the calibration map
Injectors cal.)
ALPHA-N
Algorithm used in naturally aspirated engines, where there is no stable vacuum (sport cams, ITB,
etc.). It is characterized by the fact that the load is defined by the TPS. It is not suitable nor
recommended for turbocharged engines.
PW = INJ_CONST * VE(tps,rpm) * AirDensity * Corrections + AccEnrich + InjOpeningTime
PW (pulse width) final time of injector’s opening
INJ_CONST a constant for the given size of injectors, engine’s displacement,
pressure 100kPa, temperatures of the intake air 21°C, VE 100%,
time of injectors’ opening required to obtain the stoichiometric
mixture (Lambda = 1)
VE(tps, rpm) value of volumetric effectiveness read from the VE table
AirDensity percentage difference of air density towards air density in
temperature 21°C
Corrections fuel dose corrections (discussed in the following pages)
AccEnrich acceleration enrichment
InjOpeningTime the time it takes for an injector to open from the time it has been
energized until it is fully open (value from the calibration map
Injectors cal.)
Page 56
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