DIY-WB Output Voltage Scaling

[rr]

I've had a lot of people ask about having the WB control the AFR under
WOT. Just scares the dickens outa' me. Anything goes wrong with the
sensor or electronics and the pistons find a new home in the oil pan.

That and of course then need to run the WB all of the time. . .

BobR.

Len Sabatine wrote:

>      Taking note of commanded AFR, It's just that , Commanded in the Narrow
>      NB O2 stoich "window". Changing this narrow commanded range would no
>      doubt be a good deal of work to get it right.
>      In WOT mode , having the latitude to actually compensate and control AFR
>      versus the fixed 128 # may offer rewards. In a manner of speaking ,
> adding
>      another Intergrator for WOT operation , using the WB input.
>      Getting the PCM to alter it's thinking in this area, could be
> difficult , it's ignoring
>      O2 corrections and using WOT table lookup.
>      Now . if your PCM has a setting for TPS-WOT mode , it's easier to
> accomplish
>      changes necessary , but with very cautious Monitoring of EGT.
>      FYI , the LS6 C5 PCM does WOT AFR control, of which , I'm sure the code
>      has been altered to accomplish this.
>      Most ECU's are doing the same operations, at different addresses and
> timing
>      routines per ECU's. This is where "same thing , but only different "
> enters .
>
>      With the tools and talent of the Diy-Efi membership in collective
> effort, amazing
>      things are possible. IMHO.
>     Len
>
> >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
> >
> >
> >
> > > At 09:36 AM 8/25/01 +1000, you wrote:
> > > >It should be pointed out that the current incantation of the
> > > >DIY-WB unit has a non-linear voltage:AFR transfer function.
> > >
> > > Here's an Idea!!  hook it up to an extra PCM input, and have the pcm
> > > table lookup the AFR(like it does volts to whatever for MAP, temps, etc),
> > > put it in the aldl datastream and have your palm
> > > pilot display it for ya.
> > >
> > > Doa!! if only I could get successfully started on the serial communication
> >part
> > > of a palm program.
> > >
> > > ----------------------------------------------------

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