O2 feedback

[Chris Conlon]

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>  OK the ecm also looks for a AFR change when the EGR applies,
> I can fool it with turning on a 4066 for a voltage divider on the MAP, and
> have, and that works.
> 
>   On this O2 cross counts how about an ign pulses divide by two,
> with that to trigger a O2 signal generator?.   I can verify the pulse on
> time as right by looking at the BL, right.

I don't know anything about the EGR related issue, but I had a (kludgey)
idea that might do for the cross counts:

Take one injector signal, buffer it, feed it into an RC lowpass with
RC = ~ 0.050 sec. This is a lame attempt to get a voltage corresponding
to injector PW. Take the voltage off the capacitor, and feed it into
a comparator. The other input to the comparator is a reference voltage,
what the PW "should be" at that time. Whatever pot you use for the MAP,
make it a double, and use the second one as a voltage divider to make
this ref. voltage. Then take the output of the comparator, divide it
down to a 0-1V range, buffer it, and put it into another RC lowpass
with RC ~ 0.050 sec. The voltage off that capacitor is your "fake" O2
sensor signal. (Watch all the various polarities of course.)

Some Toyota ECUs even have a signal output that indicates what the
computer is trying to do to the mixture, i.e. richen or weaken it.
Now *that* would make life *too* easy, eh?

   HTH,
   Chris C.

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