Introduction & O2 Sensor Questions

[Neil Poersch/MTSCom/MTS]

	boughton @ bignet.net (James Boughton) 
05/07/97 10:42 AM


Jim,
Thanks for the info.


> As far as I can tell, the problem with using an oxygen sensor to do wide 
range fuel/air >work is that they are not accurate in the rich region.  The 
cheapest system I am familiar with to do >wide range measurement is 
$1000.00US.  The problem is that the partial pressure of oxygen in >the exhaust 
is dependent on temperature on the rich side of stoichiometric. 

I suspected this was the case.  I wonder if an O2 sensor with an integrated 
heater would help?




 >For more information, consult John Heywood's book "Internal Combustion Engine 
>Fundamentals", page 302, where you will also find a voltage output vs. lambda 
curve.

My local library has a 1988 version but that may be too old to contain a 
section on O2 sensors.  I will check it out.


> Also, another error is introduced since the oxygen sensor functions according 
to the >Nernst equation, 

Can you recommend a source of info on the Nernst equation?