Pic controlled EGOR

[Bernd Felsche]

The Punisher tapped away at the keyboard with:

> I just re-subscribed to this list yesterday. I was on for about 6
> months a year or two ago. I noticed that the EGOR project scematic
> has been posted.

> I have been making some HEGO O2 meters that are Pic controlled.
> They have a 12 bit resolution and basicly linearize the curve and
> display the (estimated)AFR number, along with a precise bargraph
> on 2 line by 20 and also 40 char wide LCD's.  The displays look
> good, run fast, and with the 12 bit adc plus some math they seem
> to do great.

> BUT I would realy like to do this with UEGO sensors. I am
> wondering just what are the specific requirments to drive one of
> these sensors ? Could the number of components be reduced by
> driving it with software? More details would be great.

You might want to look at
        http://bernd.felsche.org/tech/EFI/vapour/DDL.html
which is where I've documented most of the technical stuff discussed
on the list and elsewhere regarding direct-"digital" driving of a
typical wide-band O2 sensor.

The object is to have a simple box that would provide a data stream
with appropriate lambda (AFR depends on the fuel used; lambda is the
ratio of actual over stoich. AFR), and to exploit the recognized
advantages of having a micro-controller close-coupled with the
sensor. Once completed, the whole thing is to be an _open_ project
with documentation, firmware, schematics, sample board layout, etc
freely distributable to encourage experimentation and promotion of
the state of the art.

The page is being revised for a number of reasons, one being that
the project has been idle for about 2 months now with my other
commitments not giving me much chance to make headway before April,
and the content is a little out of date wrt the latest pump circuit
design and the reference materials.

I hope you'll find the information useful. If you do, then please
let us know on the list.

-- 
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