[Diy_efi] O2 sensor sensitivy speed

[Andrew Theurer]

What about richening a certain cylinder occasionally for a refrence pulse?
Also, Why not use a couple of sensors isolated to fewer cylinders (like 3
cylinders per sensor on a V6) to increase your resolution?

-Andrew

----- Original Message -----
From: "Shannen Durphey" <shannen at grolen.com>
To: <Diy_efi at diy-efi.org>
Sent: Friday, April 26, 2002 10:00 PM
Subject: Re: [Diy_efi] O2 sensor sensitivy speed


>
>
> Henning Baldersheim wrote:
>
> > > > So that by you can tune each injector individually.
> > >That might be much more difficult.  How would you synchronize each
"pulse"
> > >of the O2
> > >output with a specific cylinder?
> >
> > My initial thought would be to place the sensor so early in the exhaust
> > stream that you are able to calculate it based on rpm/map and travel
> > distance.
> On some engines you can see individual cylinder intake events by viewing
the MAP
> signal with a scope.  Would it be easier to identify each cylinder by
using a
> reference for #1 cylinder then counting each reference pulse up to the
last
> cylinder? You could look for an O2 reading within a window of time after
each
> reference pulse, and decrease the window as rpm increases?  Then you couls
discard
> pulses that did not arrive within that time window, and reset the cycle if
needed.
>
>
> > You would have to have them so close that there would be no room
> > for a second pulse from the same cylinder.
> That would make for a very short manifold.
>
> > Of course it would be the
> > simplest if the pulse reached the sensor before the next one fired at
any rpm.
> > I am not sure if this is practically possible, but If you are able to
see
> > separate pulses on the sensor it sounds that it should be possible at
least
> > up to a certain rpm point.
>
> What I've seen are individual pulses that, when grouped together, followed
the
> traditional rich/lean cycle used in most engines.
> Shannen
>
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