O2 sensor idea

[Roger Heflin]

On Mon, 19 Apr 1999, Greg Hermann wrote:

> >That is why I want to get a well calibrated wide band unit and setup a
> >pic or something similar to give the kind of results the stock
> >computer wants, and give mv readings that actually mean something.
> 
> As I said earlier, Roger, it MAY (not sure yet) be possible to bias a wide
> band O2 sensor with a constant ion pumping current so that it crosses at
> any A/F ratio you want, in the same way that a standard EGO or HEGO sensor
> does--Changing the bias say for cruise or WOT, and leaving an oem ecm in
> closed loop would allow a programmable selection of A/F ratios  for
> different operating conditions. (The bias adjustment is what would fool the
> ecu, the sensor would act like normal EGO sensor at 14.7:1.) The bias and
> its changes would need to be dealt with outside of the oem ecu.
> 
> Regards, Greg

The idea is to bias the wide band O2 normally so that it reads the
range of AFR that you want.  Then put a pic in front that inputs the
wideband O2 sensor voltage,/other info and converts that via a table
(non linear table to make the wb act like a normal O2 sensor).  

I guess the other idea is to adjust the bias to read the AFR you want,
and then let the computer run in closed loop mode (even at wot), just
with the modified AFR ratio required for max power.

			Roger