Haltech E6X Manual DOS Version - Manual (Page 103)

E6X Manual
103
APPENDIX B IGNITION AND INJECTION OUTPUTS
B.1 Distribution of Outputs
The ECU has five injection/ignition outputs, or channels. These five channels are distributed
to the ignition and injection drivers that in turn are connected to IGN1-IGN4 and INJ1-INJ4
respectively.
This configuration gives the user 4 injection drivers and 4 ignition drivers.
B.2 Direct Fire Ignition
There are two forms of Direct Fire Ignition: the first method is to have one coil per cylinder
(usually mounted on top of the plug), the second method is to use a wasted spark; the
cylinders are paired (cylinders with the same TDC but on different strokes) and fired together
each time one of the cylinders requires ignition which means each cylinder has an ignition
event as it approaches TDC compression (the ignition required for that cylinder) and TDC
exhaust (the ignition required for the paired cylinder).
Each method requires the ECU to know how many coils it must drive. Each coil needs its
own ignitor and ignition output. The ECU also need to know the current engine position, it
obtains this from a synchronisation signal known commonly as a “home” signal.
The ECU is capable of driving up to 4 coils. This means that engines with more than 4
cylinders are limited to waste spark ignition. Waste spark ignition systems can ignite 2
cylinders for each ignition output consequently direct fire ignition cannot be used on engines
with more than 8 cylinders.
INJ DRIVER 3
INJ DRIVER 2
INJ DRIVER 1
IGN DRIVER 3
IGN DRIVER 2
IGN DRIVER 1
IGN DRIVER 4
INJ DRIVER 4
ECU PLD