RevC 07/15/13
Page 29
7)
Right click on the upper frame of the LamdaTa
rgetTable and select “Table
Conversion” from the list.
8)
A window called “Channels” pops up; select AFR Target Table and hit OK.
Infinity: Air and Fuel
The Infinity
ECU
uses
significantly
different
methods
of
calculating
the
fuel
delivery
requirements
and
outputs
than
previous
AEM
products.
Measured
data
from
sensors,
i.e.
Manifold
Absolute
Pressure
(MAP
[kPa]),
Air
Temperature,
Coolant
Temperature,
and
Engine
RPM
are
acquired.
The
ECU
uses
this
sensor
data
in
combination
with
Volumetric
Efficiency
(VE%)
to
estimate
airflow.
The
Volumetric
Efficiency
is
a
percentage
of
air
and
fuel
that
actually
enters
the
cylinder
during
induction
relative
to
the
volumetric
capacity
(rated
displacement)
of
the
cylinder
under
static
conditions.
The
VE
lookup
table
is
a
2-axis
lookup
table,
with
load
values
(typically
MAP
[kPa])
versus
Engine
RPM.
In
each
table
cell,
the
Engine
RPM
corresponds
with
a
specific
MAP
[kPa],
and
a
Volumetric
Efficiency
is
defined
for
that
cell.
The Volumetric Efficiency is combined with temperature sensor data to estimate a
compensated Mass Airflow. The ChargeTempBlend table dictates what ratio of air
temperature to coolant temperature is used at specific Engine RPM to adjust the density
of the inducted air. A higher number gives priority to Coolant Temperature, and is seen
at lower Engine RPM.
Once Mass
Airflow
has
been
calculated
using
the
tables
above,
the
Infinity
ECU
will
look
up
the
Target
Lambda
(AFR)
and
then
calculate
the
fuel
requirements.
Target
AFR
will
be
used
as
a
main
parameter
in
determining
fuel
injector
flow
rate.
The
LambdaTargetTable
(below
Left)
and
AFR
Target
Table
conversion
table
(below
Right)
will
have
default
values.
Based
on
the
calculated
Mass
Airflow,
the
Infinity
ECU
will
Summary of Contents for INFINITY ECU
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