COP Ignition Development

It is raining today so I found the time to get the multi-spark going. The dwell on the first pulse is a coil charge of 1.6 ms, the drop is the spark period of 0.25 ms followed by another coil charge of 0.85 ms. The second charge is less because of the stored energy in the coil. With a single spark, the spark duration would last about 1ms, but the energy would drop over that time. The second spark is full energy, and at idle speed is about 4 crank degrees retarted from the primary spark. Multi-spark is typically used at RPM less than 1500.
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The firmware is nearly complete, so I am considering the mechanical packaging. Shown are a couple enclosures, the nano ECU board, a MAP sensor, and a coil driver transistor. There will need to be as many coil drivers as coils. Since the design works for 4, 6, and 8 cylinder engines, I have considered making output modules. The ECU board and MAP will fit in the small black enclosure that is 1"x 1"x 2". The larger enclosure is about 1.25" x 3" x 6", it is much larger than needed, but would be a one size fits all, and eliminates some external connections. My plan is to use the large enclosure for prototype, and worry about the packaging and connector details till later.
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