Kevin,
I set one up on the bench. It is in the category of "Inductive Solid
State".
I was right about one thing. There is a one shot in there but it only
controls how
long the coil is grounded by the switching transistor. 0.2 milliseconds
over a wide
RPM range. That is not to say the coil will not ring long after that.
The coil fires when the computer pin goes low.
The rest of the time the coil is charging or heating up from DC current.
The coil
itself is .3 ohms but the ballast resister is .5 ohms so that is a lot of
current.
About 15 amps. Obviously the ballast resister is switched out on starting.
There is another brown wire that bypasses it. Not shown in the schematic
but you can
see it in the pictures.
Here is a schematic with the color codes of the Mazda part.
I replaced the coil with a 25 ohm power resister for testing because I
did not want
sparks flying all over the place. Interestingly if the RPM falls too low
the system
shuts down. This prevents the coil from over heating while the car is
stopped with
the ign switch on.
Paul Lamar
Paul, your shop looks a bit neater than my work area. I tend to make the
best use of my time by multitasking- like when I am waiting for fiberglass
to cure out, I go on to something else, I go until I need a bolt or part,
then add to the list, etc.
After some more testing and planning, I have decided to take a second CAS
unit and modify it. I plan to remove one of the top tits and install a
second inductive coil 180 degrees from the first. I think that with my ever
so simple system, the tits 180 apart firing twice per revolution will
require cause ignition issues with timing that will require either lots of
code, or additional hardware modification. I thought about a simple
equation related to RPM that would delay the spark of the second rotor, but
then the thought hit me that there are no teeth missing on the lower array
and therefore no indexing signal for an interrupt, so when I turned off the
key, the ignition system could be oriented 180 degrees out of phase the
next time I tried to start it. So, I think that removing one tit from the
CAS and adding the other pickup will let me signal the coils to fire at
TDC, and I can also include a delay to retard the timing while under boost
with code.
Today I have boat repair to get to, so I will have time to think about it
more while I am sanding :).
Kevin Alderman
I am going to a bit more experimenting with the 2nd gen igniter.
The ultimate non CD is coil on plug.
Paul Lamar
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