virtual closed loop dwell regulation

[Robert Sandor]

I am working out an idea to fire sparks of a 4cyl. carburetted engine in 
right time without use of lookup tables or a knock detection nor ionization 
current measurement.The only input to the regulator will be the RPM. The 
RPM-dwell lookup table itself is not enough, because the  temperature of the 
air and fuel varies. The knock detection and the ionisation current 
measurement are expensive methods. I hope a cheap method "virtual closed 
loop dwell regulation" will work. The main idea is to advance-retard dwell 
until maximal RPM is measured at fixed throttle position(Is this a fuzzy 
logic). I want to use separate coil for each cylinder. At very low RPM (like 
starting the engine) even multiple sparks could be applied. I also want to 
drive switching transistor without a MC3334 or alike IC. If the battery 
voltage and the inductivity of the coils are nearly constant, why to use an 
intelligent ignition driver IC? What do You think is this a good idea?

Robert Sandor

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