Re: Chart for OXS voltage=A/F ratio

[ejfluhr@austin.ibm.com (Fluhr)]

>>I was wondering if anyone happens to have a chart (or just know off of
>>the top of their heads) to show how the voltage from an OXS sensor
>>relates to the air/fuel ratio that it's reading.

>If the Bentley doesn't have this graph, drop by your local
>Audi or Bosch FI repair shop and ask to have a glance at
>any of the Bosch FI handbooks, especially one explaining
>"Lambda Control".


I have the Bosch FI & Engine Management book, and have found a chart
that correlates oxygen sensor voltage with air-fuel ratio.  Basically,
we want to know when the air-fuel mixture is 12.6:1 == max performance
ratio according to the above book.

On a related note, the last section of the book talks about "Tuning for
Performance & Economy".  In Section 9 (?) it describes some Scirocco racers
with KE-Jectronic (a.k.a. CIS-E) who tune their pressure actuator current
to 6mA when open-loop.  Thus, when running closed loop, the oxygen sensor
signals for a richer mixture.  Anyone know if this works?  I am not sure
I completely follow the logic of it...

Later,
Eric
'85 Coupe GT, mine
'87 Coupe GT, brothers
'82 Coupe, ????
'97 A4 1.8tqs 5-spd, Bamboo (don't ask me why!), father's!!!

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Eric J. Fluhr                                Email:  ejfluhr@austin.ibm.com
630FP Logic/Circuit Design                   Phone:  (512) 838-7589
IBM Microelectronics Div.                    Austin, TX