Reading into LTFC figures.

[Bob Wooten]

Bob,

thanks for the information.  I think that i get what you are saying but
still a bit cornfused 'bout how the O2 sensor actually works.  Someone
asked about the DIY EGOR yesterday (or the other day, they all run
together), & asked about the principle of operation.  anyone know of one
that explains how an O2 sensor actually works.  both for the standard
zirconia & for the WBO2?  I know that the short answer is that it generates
a voltage inverse to the amount of O2 in reference to the outside air
(about 22%). but....... & the WBO2 is a different story all together.  from
what i gather it is a current device not a voltage device as the standard
unit is.

anywho, thanks
BW 


> [Original Message]
> From: rr <RRauscher at nni.com>
> To: <gmecm at diy-efi.org>
> Date: 1/19/01 2:20:46 PM
> Subject: Re: Reading into LTFC figures.
>
> 
> O2 sensor activity is typically a window. X-cnts are used for aldl
reporting
> and resetting things like the proportional & integral timers.
> 
> The window will have a high and low value, say, 352mv & 734mv. As long
> as the O2 sensor is exceeding the value(s) for a time period, say 10sec,
the
> ecm will then signal O2 ready for closed loop. Once in closed loop a
different
> window might be used.
> 
> It is not unusual to get a lot of x-cnts on a cold O2. This is caused by
the
> bias value from the ecm along with a little noise.
> 
> BobR.
> 
> Bob Wooten wrote:
> 
> > Is there a definition of an active O2 sensor?  my only baseline is the
one
> > that is in my car.  how many cross counts am i supposed to have @ idle
(800
> > rpm), over what period of time?  I think that cross counts, count up to
256
> > & then reset, so there is not, just a number to look @, right?  maybe,
the
> > answer is go find more cars & look @ them.?.?
> >
> > another question, when i am looking @ the O2 output when reviewing some
> > data (data master, diacom etc), how would one define "too rich, too
lean"?
> > if the O2 sensor is crossing up & down & the data master is capturing it
> > "real time", there is no filtering or RC time constants to give a rich
or
> > lean number.  is the magic here that you just look @ the BLM, allow the
> > firmware to do the filtering & use that as the guide to too rich or too
> > lean?
> >
> > thanks again
> > BW
> >
> > > [Original Message]
> > > From: Ross Myers <ponty at axis.jeack.com.au>
> 
> <snip>
> 
> 
>
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--- Bob Wooten
--- r71chevy at earthlink.net
--- www.r71camaro.homestead.com 


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