FW: DIY_EFI Digest V1 #303

[Mark Pitts]

Thanks for the Math (but for somthing looking THAT disgusting in brackets... go wash your typing fingers now!)

Mark

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From:  Heneghan,Paul[SMTP:ph%wn.bbc at nr-comms.radio.bbc.co.uk]
>My solution is actually to use RPM(T-1) and RPM(T) to calculate 
>RPM(T+1) :
>  RPM(T+1)=RPM(T)-RPM(T-1)+RMP(T)=2*RMP(T)-RPM(T-1)
>
>It's a simple linear approximation (and simple to program
>in assembly language).
>

You could try RPM(t+1) = 3 x RPM(t) - 3 x RPM(t-1) + RPM(t-2)
This will work for curves (quadratics only) and straight lines.
If you need higher order (cubics etc.), let me know.
The extra complexity might not be worth it though.

>Sorry for my dirty English !
Paul
paul.heneghan at bbc.co.uk