In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Frame wrote:

Markistuff,

The more I think about it there is a way to tell an engine to self calibrate itself and forget about this Mapping process that I just mentioned.  We already close loop on fuel control at part throttle (O2 sensor).  There are wide range O2 sensors that will read Rich or Lean A/F ratios, so all we would have to do is tell EEC what A/F we want to operate at then through feed-back it could set it. 

 The optimum spark advance occurs when the peak cylinder pressure is approx 14° ATDC.  If we closed loop on a cylinder pressure by means of a pressure sensor then spark timing would always be optimized.     

The problem with both of these concepts is they are expensive; wide range O2 sensors from Horiba around $1000 and cylinder pressure sensors from Kistler in the same range.

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