WPSLPGExhaust Gas Oxygen (EGO) sensor Information

[Steve Schwartz]

Oops, sorry about the extra reply...fingers in OPEN-LOOP mode...

Pete,

If you're SURE about the EFI going to open-loop at WOT, then the
aforementioned two-LED system would seem to be the ticket.  Hell, a ONE LED
system is all you really need (LEAN-DANGER!).

I think you need to check your assumptions about the WOT open-closed loop
condition, however.  If it IS open-loop, and we assume it is maxed out, and
you are running LEAN, you have your answer.  Need more fuel. Size-up the
injectors, or add a boost-controlled auxiliary injector (my personal
choice).

DO us EEs proud - make your own!  Duty cycle vs. boost! Piece of cake!

Same with the LEAN detector: follower to buffer the EGO, comparator at
somewhere near .44V, a little pos. feedback to add some hysteresis (or leave
it out to watch the LED gradually get brighter!), and voilà, you iz did it!

BTW, just plan on having a RICH condition on boost.  Treading the fine
stoich line could be VERY expensive.  Pistons are a terrible thing to waste.

Best,
Steve

for Nokia employees:  Drive now, Talk later!



> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of ext-peter.betts at nokia.com
> Sent: Thursday, August 03, 2000 8:38 AM
> To: diy_efi at diy-efi.org
> Subject: RE: WPSLPGExhaust Gas Oxygen (EGO) sensor Information
>
>
>
> > What are we trying to do?
>
> What *I* am trying to do is have a tuning aid in the car to tell
> me when I'm
> running too rich or lean under WOT. I don't care what the ECU is
> doing with
> it. Ideally I was hoping for a proportional output, you know,
> slightly rich,
> rich and so rich the fuels coming out of the exhaust in flames and vice
> versa for lean conditions.
>
> I can see that under closed loop operation the ECU control algorithm is
> going RICH/LEAN/RICH/LEAN etc etc and I understand from the archives the
> reason why is mainly to keep to aounnd Stoch' and hence make efficient
> economy and reasonable power output and still get the catalytic converters
> to work efficiently.
>
> The situation I'm in is I have increased the boost on my turboed car and I
> want a method of indication to tell me when I've pushed the limit too far,
> as far as I can see this doesn't affect the closed loop operation as it's
> only under boost that I concerned about (and again I'm assuming this will
> always be open loop control).
>
> I had though an AFR meter on the O2 sensor would do this (if you
> believe all
> the advertising)
>
> So what can I do?
>
> If this needs a new thread then please change the suject title.
>
> Pete
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