DIY-WB linearity was Re: To all DIY_EFI

[Ron Schroeder]

At 02:54 PM 11/7/01 EST, you wrote:
>I've been more of a lurker, but I wanna add to the synergy of this group.
My idea is to use the LM3914 10 LED Dot/Bar Display driver.  If you look at
the volts to A/F ratio, the curve is "fairly" linear from 10:1 to 14.7:1.
Then the curve knees up and again is fairly linear from 14.7:1 to 20:1.


I was starting to design an analog linearizer for the DIY-WB but now I'm a
little confused about the curve.  I plotted this data from the project page:

ftp://diy-efi.org/pub/diy_efi/project_files/diy_wb1/v_out.txt

DIY WB  Vout    for Gasoline



Robert  Rauscher    July    2001



Vout:   AFR:    Lambda



1.4     10.08   0.69
1.45    10.23   0.70
1.5     10.38   0.71
1.55    10.53   0.72
1.6     10.69   0.73
1.65    10.86   0.74
1.7     11.03   0.75
1.75    11.2    0.76
1.8     11.38   0.77
1.85    11.57   0.79
1.9     11.76   0.80
1.95    11.96   0.81
2       12.17   0.83
2.05    12.38   0.84
2.1     12.6    0.86
2.15    12.83   0.87
2.2     13.07   0.89
2.25    13.31   0.91
2.3     13.57   0.92
2.35    13.84   0.94
2.4     14.11   0.96
2.45    14.4    0.98
2.5     14.7    1.00
2.55    15.25   1.04
2.6     15.84   1.08
2.65    16.48   1.12
2.7     17.18   1.17
2.75    17.93   1.22
2.8     18.76   1.28
2.85    19.66   1.34
2.9     20.66   1.41
4   Free    Air



and found it to be dead linear.  Did I use the wrong Vout vs. AFR table?
If I did, what data should I use?

Thanks

Ron Schroeder
WD8CDH
E. E. S.
wd8cdh at bnl.gov
rjs at bnl.gov
ron at 112motors.com
631 344-4561 Day
631 286-5677 Nite
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