DIY_EFI Digest V4 #694

Clint Sharp clint at clintsmc.demon.co.uk
Tue Dec 14 18:59:34 GMT 1999


In message <199912141000.FAA20321 at esl.eng.ohio-state.edu>, DIY_EFI
Digest <DIY_EFI-Digest-Owner at efi332.eng.ohio-state.edu> writes
>In my ignition/injection controller I added the ability to turn off the O2
>feedback so that I could tune the engine as best as possible in case an O2
>sensor failed.  My O2 PI algorithm only adds a slight bit of correction anyway.
>
>If it's a standard O2 sensor why not replace it with a pot that provides 0..1.0V
>and set the output to 0.5V which is supposed to be 14:7:1.  Then,  because the
>O2 is telling the ECU that the mixture is perfect it won't keep screwing around
>with the mixture pulse width and you can see the real result of your tuning.
I was under the impression that the ecu doesn't use a standard O2 sensor
as an analogue device, rather it watches the output go lean and then
richens the mixture and vice-versa, kind of like a a switch? 
>
>Cheers,
>
>John
Please correct me if I'm wrong though.
-- 
Clint Sharp



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