[Diy_efi] EFI system data

[William Shurvinton]

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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