[Diy_efi] Fixed Frequency Injection

[Bevan Weiss]

You'll get slight problems if the injection frequency doesn't match the
valve opening frequency...
It might happen that you get two injection events on one cycle, and several
cycles later you only get one injectiong event.  You'd have to change the
injection duty cycle to take this into account, which means you'd have to
know the position of the engine (or valve timing).  Once you've got the
valve timing, you most as well go to some form of synchronised injection.

I don't think that you'd see major problems when using a generator, or in
most situations that I can think of.  It might increase the likelyhood of
pre-ignition (due to over lean AFR) or plug fouling (due to over rich AFR)
depending on how you set it up... But neither of these will be major.

Why do you wish to go to fuel injection on this?? Is it worth the effort
that is required to go into it?


Bevan
 

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of paul w
> Sent: Friday, July 23, 2004 3:28 PM
> To: diy_efi at diy-efi.org
> Subject: [Diy_efi] Fixed Frequency Injection
> 
> Hi guys,
> 
> I'm playing with a TBI system and experimenting with fixing 
> the injection frequency and varying the pulse width, as 
> opposed to the conventional technique of synchronizing the 
> pulses to the engine and injecting once per plug firing.
> 
> My application is a generator, so the rpm is intended to be 
> regulated to a fixed set point at 1800rpm.
> 
> Any comments on whether fixed frequency would work, and what 
> the impact might be in terms of A/F control, stability, fuel 
> distribution, etc?
> 
> Thanks,
> 
> Paul
> 
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