DIY-WB.....AFR vs Vout equations

[Diehl, Jeffrey]

So, where is this on-line polynomial solver?

Thanx,
Mike Diehl,
MR-2, '87na


> -----Original Message-----
> From: NickG [mailto:nikog at mediaone.net]
> Sent: September 07, 2001 11:54 AM
> To: diy_efi at diy-efi.org
> Subject: DIY-WB.....AFR vs Vout equations
> 
> 
> In preparation of building and using the DIY-WB O2 sensor, I wanted to
> somehow relate the voltage output by the controller to an 
> actual AFR. Using
> the WB-Vout text included in the plans and an online 
> polynomial solving
> page, I have derived some equations relating the Vout to AFR. 
> I'm listing 3
> equations; the higher the order, the more accurate the equation is:
> 
> Note: the term 'x' below is the voltage output by the controller.
> 
> for n=3:
> 
> AFR = -25.2818 + 54.1746x - 27.7675x^2 + 5.01153x^3
> 
> for n=4:
> 
> AFR = 50.4636 - 95.2203x + 80.3494x^2 - 29.0507x^3 + 3.94727x^4
> 
> for n=5:
> 
> AFR = 110.714 - 244.07x + 225.008x^2 - 98.2133x^3 + 20.226x^4 
> - 1.51015x^5
> 
> One way to use these equations is with a data acquisition 
> board and Excel.
> By importing the captured WB O2 voltage into a spreadsheet, the above
> formulas can be used to calculate the AFR from the captured voltage.
> 
> Nick
> 
> 
> 
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