[Diy_efi] MAP Sensor

[Kent Martin]

By this do you mean I should look up the injector on time
from MAP and RPM and then scale the on time
by a value in another lookup table for temperature.
i.e.
ontime = FuelTable[rpm][MAP]
ontime = ontime *TempScaleLookup[temp]/0x80;
where 0x40 =< TempScaleLookup[n] <= 0xFF;
giving a possible adjust of 2 times larger or 1/2
Kent
----- Original Message -----
From: "Eric Fahlgren" <eric.fahlgren at mscsoftware.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, July 24, 2002 9:29 PM
Subject: Re: [Diy_efi] MAP Sensor


> Kent Martin wrote:
> >
> > How does one accommodate for air temperature when using a MAP sensor
lookup?
> > Do you add a ratio of the temperature to the map index?
> > If the temperature was included as an index then you would need a three
> > dimensional
> > array for RPM, air temp, and manifold pressure. How do you get around
this
> > so only
> > 2D table is needed?
>
> No, just scale the result by temperature.  Density is linearly
proportional
> to both pressure and temperature, so they are simple scalars in the PW
> calculation.
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi
>
>



_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi