[Diy_efi] Fixed frequency PWM batch mode FI

[Dave Dahlgren]

With AFR constant PW is exactly proportional to torque or at least has been for
the last 12 years I have done them..
dave

Ron Schroeder wrote:
> 
> Hi Les,
> 
> Since torque is roughly proportional to fuel injected per combustion event
> and air is roughly proportional to MAP, the simplest first order fuel
> calculation is MAP times RPM.  So having injection NOT related to RPM would
> actually make fuel calculations harder.  My first EFI was as simple as a 555
> triggered by the ignition and the MAP scaled and inputed into the threshold
> pin.
> 
> Ron Schroeder
> WD8CDH
> day 631 344-4561
> nite 631 286-5677
> 
> ----- Original Message -----
> From: "Les Dittert" <lesd at earthlink.net>
> To: <diy_efi at diy-efi.org>
> Sent: Monday, August 19, 2002 8:42 PM
> Subject: [Diy_efi] Fixed frequency PWM batch mode FI
> 
> > I have searched high and low and haven't found the answer to this
> > question:
> > are there any disadvantages to running the injectors at a
> > fixed frequency of injection that isn't related to RPM?
> > I realize that doing this in batch mode will result in some injections
> > hitting a close valve sometimes and then sometimes hitting an open
> > valve.
> > Since some OEM fuel systems run batch mode where they fire all injectors
> > at the same time
> > I figured they have the same situation anyway.
> > Another question:
> > If using a fixed frequency you what should that frequency be?
> > I'm assuming it should be something equivalent to running a sequential
> > injection system at about 4000 RPM.
> >
> > -Les
> >
> >
> >
> >
> >
> >
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> 
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