ALPHA-N with MAP multiplication
Algorithm combining features of Speed Density and Alpha-N. The load is defined by TPS, while VE
value is multiplied by the value of absolute pressure in the intake manifold. It can be used for both
naturally aspirated and turbocharged engines.
PW = INJ_CONST * VE(tps,rpm) * MAP * 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
MAP Intake manifold pressure
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.)
Corrections
Corrections = Baro * Warmup * ASE * EGO * KS * NITROUS
Corrections Final percentage value of fuel dose correction
Baro(barometric correction) Barometric correction used in Alpha-N algorithm
Warmup(warmup
enrichment)
value of mixture enrichment in the function of cooling liquid
temperature expressed in percentage
ASE(Afterstart enrichment) Enrichment applied after engine start for given number of engine
cycles
EGO(Exhaust gas oxgen
sensor correction)
correction according to indications of the Lambda probe
KS(Knock Sensor
Correction)
enrichment in the moment of knock occurrence
NITROUS enrichment of the mixture with the activation of nitrous oxide system
Page 57
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