General; Speed Density - ECU Master EMU User Manual

General

Fuelling general configuration window is used to set up general fueling strategy and parameters.
Values entered here directly influence fuel dose, so it's important to enter values that reflect real
engine parameters.
PARAMETER
Engine
displacement
Fueling type
Enable baro
correction
Injectors size

Speed density

The basic algorithm of calculating the fuel dose can be used for turbo engines as well as for
naturally aspirated ones. It can be characterized by the fact that engine's load is defined by the
value of absolute pressure in the intake manifold.
In this algorithm the fuel dose is calculated as follows:
PW = INJ_CONST * VE(map,rpm) * MAP * AirDensity * Corrections + AccEnrich +
InjOpeningTime
PW (pulse width)
INJ_CONST
VE(map, rpm)
MAP
AirDensity
DESCRIPTION
Engine displacement in cubic centimeters
Fueling strategy selection. Fueling strategies are described below.
Enables fuel dose correction as a function of barometric pressure. Value of
correction is defined with Barometric corr. 2D map. Barometric correction
should be used with Alpha-N fueling strategy.
Injector flow in cubic centimeters per minute. If number of injectors is not equal
to the number of cylinders, average injector flow per cylinder should be
entered here.
final time of injector's opening
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)
value of volumetric effectiveness read from the VE table
Intake manifold pressure
percentage difference of air density towards air density in
temperature 21°C
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