[Diy_efi] EFI system data

[Kent Martin]

Yes turn on time may be neglible, but I believe that they
will take longer to close due to the extra energy stored in the
coil compared to a p&H type where less energy is stored in the
coil during the hold time and will close faster. I know you can do it fewer
timers
with the ballast resistor type I have done it before, this time
I want it better.
Kent.
----- Original Message -----
From: "William Shurvinton" <shurvinton at orange.net>
To: <diy_efi at diy-efi.org>
Sent: Thursday, July 25, 2002 8:27 AM
Subject: Re: [Diy_efi] EFI system data


> Take a look at the megasquirt code. It only has 3 timers and manages 2
> independent PWM injector drivers. A case study in a simple and elegant
> solution that works.
>
>
> Someone a while back publsihed a home brew injector flow bench. He
measured
> the effect of ballast resistors and found there to be no measurable delay
in
> turn on time. Don't knock low tech. If you are doing this all from scratch
> you need all the easy/low tech tricks in the book to get you running. Then
> you can worry about letting techy fantasies carry you away.
>
> Bill
> ----- Original Message -----
> From: Kent Martin <kentmartin at froggy.com.au>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, July 24, 2002 12:47 PM
> Subject: Re: [Diy_efi] EFI system data
>
>
> > The MCU does have pwm output but I'm superimposing a 20Khz square on top
> of
> > the injector
> > on period. To do this I must have an interrupt at each toggle of the
> output
> > or use another timer to
> > stop the 20Khz timer. This would require two timers for each injector
and
> > this is not desirable
> > as it has only 11 timers, and I need a few others as well. |A ballast
> > resistor I would have thought would
> > give a slower opening time and more non linearity of  volume with open
> time,
> > plus it's a bit low
> > tech for me.
> >
> > Kent.
> >
>
>
>
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>
>



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