Haltech E6X Manual DOS Version - Manual (Page 120)

E6X Manual
120
Some trigger devices have uneven pulse widths to indicate the position of a specific cylinder
(often cylinder 1). If rising edges were used as the trigger edge then there would be a
variation of 20° between the trigger for cylinder 1 and all other cylinders. This would lead to
cylinder 1 being 20° more advanced than all the other cylinders. To ensure even ignition
timing the trigger edge would be the falling edge and the trigger angle would be 60° BTDC.
As describe above, Hall effect triggers produce a signal that is made up of transitions or edges
and these edges correspond to a specific angle and as a result the ECU need to be configured
to trigger on a specific edge. As illustrated earlier, reluctor triggers produce a different signal
trace and the ECU uses signal conditioning to produce a rising edge to trigger the ECU,
consequently the trigger edge does not need to be defined for reluctor signals.
E.4 Trigger Gain and Reluctor Adaptor Tuning
The trigger gain is only applicable when a reluctor sensor is used. The nature of the reluctor
trigger and variations of sensor performance across the range of available sensors requires
some tuning of the hardware for a specific application. Certain reluctor sensors require the
amplitude of the reluctor signal to be amplified, the ECU offers 8 gain settings for both the
trigger and home channel.
Note:
Any combination of hall effect, optical or reluctor type pick-up may be used
for the “trigger” (main ignition event) and “home” (sync. Event) inputs.
However, reluctor type pick-ups must be connected to their respective reluctor
adaptor input.