Ignition parameters for odd fire coil type configuration.
As I understand, the Marelli microplex logic for starting the ignition is:
| On CamTooth 1 | START COUNT Crank teeth |
| On CamTooth 2 | If CrankCount=2 then START IGNITION, (next cyl. is c2 90° from here |
In software they simply made a switch for the 12 cases
given by the 12 teeth met in a 720° cycle. Also they simply put a
constant 120° dwell time since there is always 120° (that is 30°+90° or 90°+30°)between the 2 previous teeth and the firing tooth. See here after
BLEU : IgnitBiturbo1000.wav - JAUNE: IgnA - VERT IgnB
Question
Lets note the 6 tuples of 2 crank teeth which are seen by the VR sensor during a double revolution of 720 ° by the following:
/t01/.30°./t02/ .. 90°.. /t03/.30°./t04/ .. 90°.. /t05/.30°./t06/ 90°
/t11/.30°./t12/ .. 90°.. /t13/30°/t14/ .. 90°.. /t15/.30°./t16/ 90°
Indeed cylinder numbering is not useful at this bench test stage. Although things are more involved we just want to exercise the VemsTune capabilities as a first attempt and observe with a scope what's coming out.
So lets us ask Genboard to fire 10° before the following teeth
/t01/ ..... 150° .... /t04/ .. 90°.. /t05/ ..... 150° ....
/t12/ .. 90°.. /t13/ ..... 150° .... /t16/ .. 90°..
1.1.90 with option Maserati for the triggers does not seem to configure events h[1] and ign output h[2].
What are the options to set from the VemsTune menus?
- download the config from MembersPage/OddFireSixCyl
- dragndrop file to relevant dialogs ("primary trigger", "reftooth table"). This is the quick way to import the displayed settings (changed entries change to red)
- the ign outputs must be set to your ignout wiring
Can we do odd firing with coil type triggers? How?
The config used the individual cylinder spark delay.
Anyway I don't even know on which crank tooth Firmware 1.1.90 start counting. I should make a triggerlog next time.
So that we can help with ignout config that matches your wiring, fill this in:
- What is the exact position of the 2 primtrig pulses coming after the second sectrig pulse ?
- What is the cylinder that follows ?
- which ignout is that connected to ?
- than list the remaining (5) cyl / ignout entries
- always mark the angle separation between the cyl/ignout entries (in a separate line, to be clear, 150 or 90 degrees)
Inj outputs - same order as ign
Use the same injout entry as the ign (if topmost ign is, say, cyl3, topmost inj should be also cyl3 output for unbiased inj-angle positions).