[Diy_efi] Fixed frequency PWM batch mode FI

[Bevan Weiss]

If you're going to be using PWM, then most likely you'll be using a
microcontroller to obtain the PWM'd output.  This is normally based on a
timer inside the chip, which is also capable of changing the frequency of
the cycle (as well as the duty cycle).  So why would you want to only use a
fixed frequency??

----- Original Message -----
From: "Les Dittert" <lesd at earthlink.net>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, August 20, 2002 12:42 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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>
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