DIY-WB Output Voltage Scaling

[rr]

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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