[Diy_efi] DIY-WB question

[Klaus Allmendinger]

Hi,

I have two short questions about UEGO sensors in general:

Question 1:

After looking at the output curves of Ip (pump current) vs. Lambda at
various places on the web, can the UEGO outputs not described as:

Lambda = A / (A - Ip)  for Lambda > 1 and
Lambda = B / (B - Ip) for Lambda < 1 ??

The constants A and B account for the different curve slopes between for
lambda <1 and > 1.

The assumption is that the ratio C = A/B is constant and a calibration
factor K can be applied to multiply the nominal A and B values during free
air calibration so that the real A and B used are correct. It is also
assumed that there are steady state conditions for temp, air pressure and
exhaust pressure so that the only thing changing is lambda.

Question 2:

Is it possible to calibrate an UEGO for stoich by mounting it in a very
small airtight chamber and then running it. The pump current should
initially indicate free air and then decline and settle at 0 when all
oxygen is pumped out of the chamber?


Regards,
Klaus


_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi