Multi Coil Setups

[Bruce Plecan]

Check out the smart coils used on the late GMs, they have all the
electronics in them, and just need the fire signal. Orin posted about the
"operation" of them.  They have an auto shut off.
Grumpy


>      I want to use 4 ignition coils for my 4 cylinder application.  I have
> designed an ECU that uses a single 'output compare channel'  to produce
four
> negative going pulses (one every 180 crank degrees + advance retard offset
> etc) that I am de-multiplexing to one of four coils (via driver etc) .  At
> present all coils are always on except the one that is making a spark,
which
> is off for only 2ms then back on until it's cyclinders next spark -
another
> 720degs approx
> Is it possible to leave the coils on permanently (except for a spark
'dwell'
> / coil off period of say 2 ms for every spark  ) ?  Obviously the highest
> rpm is limited with a fixed dwell like this to speeds where engine
> revoultion takes more than  4ms a revolution.
> Is using a Ballast resistor to limit coil current o.k? Or will this
> compromised the coils 'spark ability' given that it's 1/2LI^2 energy will
> not be able to be at the coils maximum...after all the point is for me to
> build a GOOD system.
>
> Cheer Nick.
> '87 Supercharged MR2
>
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