Honda UEGO Sensor...

[Frank F Parker]

On Fri, 26 Apr 1996, Zublin, Bryan (SD-MS) wrote:
> A few questions:
> 1.  Is each sensor calibrated with each interface box?  For example, with 
> the NTK or Horiba boxes, when you replace the UEGO sensor, do you need to 
> recalibrate the unit?  Hopefully the answer is NO.

Horriba is about 1 mile from my house. I try to stop by and ask them
but I don't think so.

> 
> 2.  What kind of accuracy do the manufacturers claim for the sensors?  And 
> what accuracy do the interface box manufacturers claim?  This project would 
> require the initial accuracy to be decent, without having to calibrate 
> (tweak) each unit against an expensive lab standard.
> 
>From the Horriba sheet, the range is lamda 0.7 (rich) to 1.5 (lean)
    Accuracy: +- 0.08 from L=0.7 to 0.9
              +- 0.04 from L=0.9 to 1.2 where L=1.0= 14.7/1 a/f
              +- 0.08 from L=1.2 to 1.5 ( very lean)
Sensor calibration is shown as 1 point cal in atmosphere
 
The UEGO is 2 back to back cells with the pumping current measured after
cell is supplied from a constant current supply. Output is positive above
14.7 and negative as less than (rich) side of 14.7/1. It is not linear
so that is the problem. What is the transfer function?? The companies
are secretive. I have a lead on a circuit for the Bosch sensor.

Frank Parker
>