DIY-WB bar graph display

[Brian Renegar]

Oh ok.  That makes sense.  I thought you were trying to scale the WB output
for use at all times with the ECM and normal scale of a NB (ie: scrapping
the NB).

Actually, that's a clever idea!  I have a programmable chip for my Ford
EEC-IV processor, and later in the year they plan on adding data logging
capabilities for such things as MAF, TPS, ... , and O2 sensors.  That would
probably work in my case as well, since the EEC-IV disregards O2's at WOT.
Care to elaborate on the design or complexity?

Thanks,
Brian


>The circuit I described below has a mux (multiplexer) that selects the
>scaled WB sensor output for the ECM O2 sensor analog input @ WOT, while the
>NB O2 sensor input is selected @ part throttle.  An ECM that does not run
>closed loop @ WOT disregards the O2 sensor input @ WOT, so the voltage
>applied to that input my be any value, within the range of the A to D, as
>it is basically being used as a data logging input @ WOT.
>
>Tim Burgess

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