[Diy_efi] Fixed frequency PWM batch mode FI

[Les Dittert]

I was the one thinking of using non rpm related injection. I am using a
MAF
so I don't think the rpm *has* to come into the equation , since I don't
need to
extrapolate air flow from rpm as is done on speed density systems.
I am still concerned with beat frequencies between the rpm and injection
rate, so I will probably go with a crank 
trigger and do a batch injection once per rev.
-Les


-----Original Message-----
From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org] On
Behalf Of bcroe at juno.com
Sent: Monday, August 26, 2002 12:51 AM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] Fixed frequency PWM batch mode FI


On Sat, 24 Aug 2002 06:36:07 -0400 Dave Dahlgren <ddahlgren at snet.net>
writes:
> With AFR constant PW is exactly proportional to torque or at least
> has been for the last 12 years I have done them..
> dave

That is true when the injection pulse is triggered by crank 
rotation.  So number of (constant width) pulses increases 
with rpm, at constant torque.  

If you fix the pulse frequency, the above statements no 
longer apply.  If rotation does not control how many pulses 
occur, then rpm will have to be a multiplier in determining 
pulse width.  This could be made to work, but I don't see 
the advantage.

The method described by Ron is quite straight forward.

Bruce Roe


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