MembersPage/FPhil/CoilTypeOddFireConfig (2011-05-24 21:32:53)

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

microp10.jpg

microp11.jpg

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°..

What are the options to set from the VemsTune menus?

Answer

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.

As for the use of spark delay, I think I have understood :

Because of the odd fire configuration of genboard, it remains 6 reference trigger pulse per double cycle from the 12 crank triggers, hence they are 120 ° apart. That is

/t01/. 120°.. /t03/.120°.. /t05/.. 120°

/t11/..120° /t13/ ..120° /t15/..120°

or

/t02/. 120°.. /t04/.120° etc depending of when firmware does the sync from the cam trigger (I have to find out that)

Now if the it is fire on the reference triggers AND for each of them 30° in delay (say d0i etc) as well and on a separate output, we get 12 firings which are :

/t01/.30°./d01/.90°./t03/30°/d03/.90°./t05/.30°/d05/. 90°.

/t11/.30°./d11/.90°./t13/30°/d13/.90°./t15/.30°/d15/. 90°.

and from these 12 firings we can use 6 which are as searched:

.30°./d01/.90°./t03/.150°/d05/. 90°.

/t11/.150°/d13/.90°./t15/.120°.

Question

Is this the trick?

How do we set the delay parameters and configure for 12 firing events?


Help for ignout config

So that we can help with ignout config that matches your wiring, fill this in:

Answer

I am not at this point. Next step to get on the test bench 6 firings events whith the proper phases : 90-150_90-150-90-150 whatever the ignout since I do not have a wiring.

As said I have not found the delay parameter.

Then, after this step completed, I would connect the firings lines (diodes) for bank A together, do the same for bank B and use the distributor same way as with the Microplex (we are still far from here).


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).