WBO2 LCD digital display

[Bruce]

As long as your running closed loop (and software for a cat converter), you
see it swinging.  If you set the cross over at 14.7 and want to maintain
that then it's just a fact of life there will be toggling.

Anything you do to slow it down, really slows it down, and generally does
alot of averaging.  Both of which you don't want, IMO
YMMV
Bruce





----- Original Message -----
From: <Neil.Poersch at mts.mb.ca>
To: <diy_efi at diy-efi.org>
Sent: Monday, October 22, 2001 2:37 PM
Subject: Re: WBO2 LCD digital display


>
> This brings up a point that I have been wondering about.  I have run an
LCD
> panel meter on my narrow band O2 sensor on my carbureted motorcycle for
> about four years now.  I can monitor the readout fairly well because
> carburetor jet circuits do not dynamically vary the AFR as does an EFI
> system.  However, when I have monitored the O2 sensor on my EFI car the
> reading constantly toggles between rich and lean as the EFI does its job.
> It is impossible to make sense of the output with an ordinary DVM because
> of the rapid changes.  I normally use a DVM with a min/max/avg capability
> to capture what is happening.  During WOT the EFI runs open loop and the
O2
> sensor output settles down somewhat but min/max/avg still helps.
>
> I would guess that the WBO2 unit's output is also going to swing wildly
> during normal driving.  Again WOT may be more stable.  But unless there is
> some averaging built into the circuit I would think the output will be
> difficult to read.
>
> Neil
>
> >
> I agree with Bruce; a digital display may be quite difficult
> to use on the road.  The problem is not just the size; the
> signal is making small changes at a rate that could
> turn the digit into a blur of numbers.
>
> The LED display was designed specifically to deal with
> these issues; it has been shown to work very well in
> practice.  It also deals with the linearity problems.  Data
> logging is another answer, perhaps the best when
> only one person is involved.
> <
>
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