Ox sender actual function

[Bruce Plecan]

-----Original Message-----
From: Bill the arcstarter <arcstarter at hotmail.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>;
markw at vehicle.me.berkeley.edu <markw at vehicle.me.berkeley.edu>
Date: Monday, November 09, 1998 11:37 PM
Subject: Re: Ox sender actual function

Well just to stir the pot a little more.  While there seems to be more
evidence about it not doing what we're told it does, check out the
witch's brew of stuff they call gasoline.   On an almost daily basis
they vary the formula sepending on what they have on hand, vs
blend to a specific mixture.
Cheers
Bruce



>Mark Wilcutts wrote:
>>Only when oxygen ions diffuse through the ZrO2 ceramic substrate do you
>>get a voltage on the sensor, perhaps the testers were misinterpreting
>the
>>results...  The voltage you get from the sensor is related to exhaust
>>oxygen concentration by
>>
>>V = kT/2e ln(P(O2)_a/P(O2)_e)
>
>Interesting.  I've been poking around the archives looking up O2 sensor
>stuff.  Seems like well informed people have presented contrasting
>claims as to what those sensors actually sense.  I'm still not convinced
>anyone quite knows the answer...
>
>Here's a message I posted to the www.se-r.net list a few months ago (the
>se-r is Nissan's sr20de / sr20det platform).  It describes my own
>experiments on O2 sensors (which I still don't believe sense O2 due to
>my propane / argon experiment...):
>
>>Drivers,
>> I spent some time playing with a used (but not dead) Bosch O2 sensor.
>I'd
>>removed this sensor from my car at 75Kmi due to old age and routine
>maintenance...
>>
>>The sensor heater requires 12 volts, 1 amp from the red to black wire.
>>
>>The output signal is measured (voltage) from the sensor case to the
>>white wire.
>>
>>The sensor takes a LONG time to heat up - a good 3-4 minutes is
>required
>>before the output signal represents actual conditions.  Heatup time
>>would be shorter if it were installed in an exhaust system of course!
>>Perhaps this explains why the ECU runs open-loop for so long...
>>
>>I measured voltages <0.10 with the sensor in free air, and >0.60 if I
>>blow pure propane (burned or unburned) over the end.
>>
>>The strange thing is that immersing the sensor end in 100% argon did
>NOT
>>produce a lean ( >0.5) reading but was undistinguishable from the
>>free-air reading.  This leads me to believe that these sensors are not
>>actually O2 sensors, but perhaps hydrocarbon sensors...  Comments
>>anyone?
>>
>>I'm told that O2 sensors won't read properly under WOT conditions.  Can
>>anyone explain why this is??
>
>Later.  Let the O2 sensor debate rage on!
>
>-Bill the arcstarter
>Starting arcs in Cinci, OH
>http://www.geocities.com/CapeCanaveral/Hangar/6160
>
>
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