DIY-WB Output Voltage Scaling

[Len Sabatine]

    Personally , I concur with the application of unused ADC channel [s]
    for the purpose at hand.  We're talking use of an outside Micro or
    PIC to get all the work done that's being proposed , as I'm seeing it.
    Or , some top heavy bit bang code. Ug.
    Len

>I'd advise against using any ADC inputs that are already used for
>something else. The fuel pump input is commonly used to adjust
>the injector pulse width for vehicle voltage.
>
>I've thought about a bunch of options and I keep coming back
>to adding code for an unused ADC input. There is also some
>work being done to have the WB sampled through the normal O2
>input. This may be a viable alternative.
>
>BobR.
>
>Hector wrote:
>
> > I was thinking about this but there is one signal that I think we all
> > have and *could* be used. The reference voltage from the fuel pump
> > relay *may* not be needed as anything other than a display for a
> > scanner, not really as a diagnostic input. I'm not 100% certain of why
> > the ecm has this input but it could be used to datalog the WB activity
> > if it reads it accurately enough. It won't be scaled but at least you
> > don't have to look at something while you are driving as a scanner
> > will pick it up. Anyone have any thoughts?
> >
> > Hector
> > http://soflaspeed.freeservers.com
> >
> > > Sounds like a great idea BUT unfortunately we are all using
> > different ecu's
> > > and code so it would be hard to do.
> > > I like the idea and if we had enough programmers amongst us that
> > could teach
> > > us how to add code to our respective ecu's
> > >
> > > Take this a step further and get the table lookup to compare WB A/F
> > ratio to
> > > a commanded A/F ratio table and then adjust a WB  BLM to achieve
> > closed loop
> > > A/F ratios at points other than Stoichiometric ?
> > >
> > >
> > > Daniel
> >
> > 
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> >
>
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