Wide Ratio O2

[Steven Gorkowski]

I do not get it, if I do 12 bit A/d conversion dividing the it into
4000+ pieces from 0 to 1v  and make a table so the table relates to A/f
ratio and compensate for temp. buy reading with therm. probe . Tell me
how the reading can't be accurate . Is a chemical reaction causing a
random / none predictable voltage out???? Remember I don't need to read
much better than .5 A/F ratio because I'll only need to know at what
voltage max. power happens so I can go to that point again. Don't get me
wrong the wide range sensor  I will try to build one thanks to you and
others but I don't think I'll put it into the race car at race day but
the cheaper one would be no problem. A more expensive sensor under some
applications it may be over kill.

Confused

Steven Gorkowski

garfield at pilgrimhouse.com wrote:

> On Mon, 23 Mar 1998 11:16:19 +0000, bamcknig at postoffice.syspac.com
> wrote:
> >,It sounds (reads) like the wide range  O2 meter is doable and not to
>
> >expensive ($300 or so).
> >Do you have any idea about the benefits over the original el cheapo
> >O2 analyzer?  If I got my old (less than 30,000 mile) single lead
> >sensor running at about 750 deg.F. after warm up and have the exhaust
>
> >system bonded to electrical ground, how much will I benefit by going
> >to a three lead system (I don't think much), or to the wide range O2?
>
> Dude, if you have an el cheapo O2 analyzer that's giving you good
> results, probably not much. But most of them "switch-type" sensors,
> even
> the heated ones, have so steepNnasty a curve of O2 vrs voltage that
> they
> aren't usually good for much of anything but telling if you are rich
> or
> lean of stoich.
>
> If you have one that's showing readable transitions between say each
> 0.5
> AFR, or even 1.0 AFR changes, and you know those reading are for real,
>
> you've got one of the 'few' el cheapos that works worth a diddle.
> Count
> yourself unusually lucky; maybe buy a lotto ticket!
>
> Gar