Info on EFI systems

[Jonathan R. Lusky]

Steve=Ravet%Prj=Eng%PCPD=Hou at bangate.compaq.com writes:
> ObEFI:  What are possible algorithms for electronically controlled ignition?  
> Ithink a closed loop system using feedback to continuously modify timing is a 
> better solution than static lookup tables, but what do you use for feedback?  
> Exhaust temp/composition?

Exhaust temp and composition vary widely with a bunch of factors besides
spark timing, so I don't think either are appropriate.  I think the only
effective way to do closed loop spark is with a pressure sensor, a crank
angle sensor, and calculating the location (degrees ATDC) of peak
cylinder pressure.  You'd still want to have a static map beneath this
I think.

-- 
Jonathan R. Lusky  --  lusky at knuth.mtsu.edu
 "Turbos are nice but I'd rather be blown!"
   89 Jeep Wrangler - 258 / For Sale: $8000 obo
       80 Toyota Celica - 20R / 5spd