[Diy_efi] Fixed frequency PWM batch mode FI

[bill.shurvinton at nokia.com]

Emissions go up.

Fixed frequency I haven't thought about. You'd probably be better off =
using CIS parts and PWM on the pump.=20

For fixed frequency you would have to set that at max RPM, so if max is =
6000 then 100Hz. But at 600RPM (say this is idle) you will have 10 =
injections at your lowest VE. This is not likely to work.

Bill

-----Original Message-----
From: ext Les Dittert [mailto:lesd at earthlink.net]
Sent: 20 August 2002 01:42
To: diy_efi at diy-efi.org
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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