Lambda value/ AFR correlation

[Doug Robson]

Is it possible to get the closed form equation fot this relationship and
square wave doohicky???


At 10:00 PM 5/12/97 -0400, you wrote:
>> Hi Brad, I have a GM Service Technology Group document that lists AFR vs
>> 02 voltage.
>> 
>> 
>> A/F                        02 Volts
>>    Ratio			   Range
>> ========		   =============
>> 
>> 17.1			   0.090    0.110
>> 16.5			   0.190    0.205
>> 16.0			   0.290    0.310
>> 15.5			   0.390    0.410
>> 14.9			   0.490    0.510
>> 14.4			   0.585    0.605
>> 13.9			   0.680    0.700
>> 13.2			   0.780    0.800
>> 12.7			   0.870    0.890
>> 12.1			   0.965    0.985
>> 
>> However I must say that this must be used with a caution. My experience
>> 
>This chart is NOT correct. Like a previous comment, it is way too linear.
>The real curve is a square shaped S curve with most of the voltage 
>change (eg:0.2-0.7) occuring in the region of about 0.5 on either side
>of Lambda of 1.0 (14.7 a/f)
>
>The NGK is quite good but expensive from Horriba. 
>
>Bailey Engineering now sells a Special Bosch sensor and readout box to
>accurately measure a/f in rich region. The NGK/Horriba or the Bailey
>box is the ONLY accurate way to read a/f.
>
>For the member who wanted the a/f vs Lambda, it is air/fuel div by
>14.7=Lambda. Eg:
>
>		A/F	Lambda
>		17.64	1.20
>		16.17	1.10
>		14.70	1.00
>		13.23	0.90
>		11.76	0.80
>etc
>
>Frank Parker
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