AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 239)

Tuning Guide 233
© 2014 AEM Performance Electronics
A few additional tips:
1. After selecting your axis input and closing the wizard. Save your layout and reopen it in Infinity
Tuner for the changes to sync live in the table controls.
2. The same features apply to the available HighSide outputs too. The HighSides are limited to
simple on/off operation though and are not PWM-able. Select the axis inputs the same way in
the Setup Wizard then configure the output tables:
3. Always refer to the Infinity Pinout sheet to note any hardware limitations.
Injector Control
The Infinity Tuner has integrated peak and hold injector drivers. In order to benefit from this
feature, low impedance injectors must be used for high current triggering. The image below
shows a sample capture of a 4 cylinder engine setup.
The fuel injector control is flexible enough to drive any multi-port fuel injector. A high impedance
injector can be turned ON continuously whereas a low impedance injector would require a
method to limit the current. A high impedance injector can set the duty time to 100% as this does
not require a pulse width modulated current limiting phase. The injector waveform has several
components that are controlled. Peak and hold control will hold the signal ON for the open phase
and modulate the signal in order to limit the current.
ReqFuelX
Units: us/10
Description: This is the required fuel. The total time that the injector will be opened.
FI_OpenTimeX
Units: us/10
Description: This is the open time when the ECU will enable the low side injector driver circuit in
a continuous fashion as to provide the current to open the injector.
FI_CyclTimeX
Units: us/10
Description: This is the cycle time of the PWM during the hold cycle of a low impedance
injector. 1000 (0.1 milliseconds) would be a typical setting.