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

William,
  I dont think its so much art as someone having a very clear undestanding of everything that goes on in an internal combustion engine, as well as the capabilities of the electronics. To my understanding the idea behind a peak and hold injector is to allow you to use excessive amounts of current to produce a very fast opening time. The closer an injector pulsewidth is to a squarewave the more consistant and predictable, OR it could just be fuel pressure related.

 

Anyway, ECU design requires a very high level of skill in several disciplines, or a very well coordinated team of those disciplines.

 

Almost all gasoline engines in the U.S. are indirect injection, I'm sure there are some exotic DI's but dont know of them. Trust GAF, everything he's said has been spot on.

 

GAF Thanks, its been enlightneing.

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