AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 262)

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© 2014 AEM Performance Electronics
Infinity User Manual
Multi-Map Tuning
Multiple maps can be utilized on the fly such as VE, Lambda, and Ignition to be switched
manually with analog input or various conditions such as MAP [kPa] or gear. Several of these
options are described in the Setup Wizard under Advanced Setup of Input Function
Assignments. The following text describes examples of how this feature can be used. Many
different options are possible and not all of them are described below.
Blending between multiple maps using ModeSwitch and FlexContent:
For Ignition, your calibration is already using the 1D table 'ModeSelect_Ign' to switch between
two ignition maps:
When ModeSwitch =1, use IgnMap
When ModeSwitch = 2, use IgnMap_2
There are two more things you need to configure. First, you need to understand how the ECU
blends because of the ethanol content. There is a 1D table called 'IgnBlendTable.' The input to
the table is FlexContent [%], and the output is a blend amount.
For now, let's assume you leave the original numbers in the 'IgnBlendTable' and it will blend
smoothly and evenly between the 'pump fuel' timing numbers when FlexContent = 0 (0% ethanol)
and the 'flex fuel' timing numbers when FlexContent = 1.0 (100% ethanol). You could however,
change the values in the table so the ECU uses 'pump fuel' timing numbers when Ethanol
Content is 0–40% and switches to 'flex fuel' timing when Ethanol Content is 40% or greater. Do
that by setting the table cell values to '0.00' for FlexContent breakpoints 0.0–0.4 , and '1.00' for
FlexContent breakpoints 0.4–1.0.
But let's not touch that table at all yet, let's assume you want it to blend smoothly depending on
ethanol content, as long as your ModeSwitch is in position 3.
With the flex fuel sensor, the ECU will blend between whatever map is defined in the 1D
'ModeSelect_Ign' table and whatever map is defined in the 'ModeSelect_IgnBlend' table. One
way you could do it is set the tables to these values: