O2 sensor output

[Michael Skolones]

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     For the typical, less expensive (lambda=1 setting) sensor the value at 
     stoich is not well defined.  The O2 sensor acts somewhat like a 
     two-position switch: for lean mixtures the output is low (~0.1 V), for 
     rich mixtures it is high (~0.8 V), but the slope of the V vs lambda 
     curve is very steep around the stoich point where lambda=1.  The ECU's 
     job is to vary the mixture such that the O2 sensor ouput bounces back 
     and forth regularly between these two values.  I suppose you could use 
     the average of the low and high readings from your sensor as a 
     "perfect mixture" reading, but I doubt you'll be able to get your FI 
     system to stay exactly at this mixture setting.
     
     The newer, more expensive sensors (around US $300 and up) have a more 
     spread-out curve, and the numerical values of the sensor output are 
     useful.  The output value at stoich for these sensors depends on the 
     individual sensor model, though lambda=1.2 is common (I think. Don't 
     have one, so I'm not sure)
     
     Mike Skolones


______________________________ Reply Separator _________________________________
Subject: O2 sensor output
Author:  diy_efi at coulomb.eng.ohio-state.edu at Internet
Date:    9/10/97 4:22 AM


Can anyone tell me what it's the output of an O2 sensor ( it's any 
diference between type ?) on perfect mixture ?
Alex
http://home.onestop.net/nalex
     
     
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Subject: O2 sensor output
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