DIY-WB Output Voltage Scaling

[Len Sabatine]

     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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