WPSLPGExhaust Gas Oxygen (EGO) sensor Information

[steve ravet]

There's a lot of O2 discussion in the archives.  I'll summarize and say
that the O2 sensor acts like a switch.  The voltage curve is very steep,
like a straight line, as you pass across stoich.  It's too steep to use
the O2 in a feedback loop to maintain stoich, which is why manufacturers
just cross back and forth over stoich so that you average out to
stoich.  In addition, although the voltages level out on either side of
stoich, the actual voltage depends on exhaust temp and other factors. 
So you can't say that .8v (for example) is any particular AFR either.

An AFR meter based on a cheap factory O2 sensor only needs 2 LEDs:  rich
and lean, because that's all the information you can get from the
sensor.

Garfield is out of town otherwise I'm sure he would have weighed in by
now.

--steve

ext-peter.betts at nokia.com wrote:
> 
> Ah! So you think the sensor works over a larger range and just because the
> ECU doesn't use it, it doesn't stop me using it as a diagnostic aid with my
> AFR Meter?
> 
> When I say larger range I guess it gets pretty non-linear either side of
> stoch'  ? But I'm hoping you can still make sense of the sensor output
> either side of it.
> 
> Guru needed to reply I think.
> 

-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com
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