[Diy_efi] Measuring Pulse Width/Duty Cycle of an Injector?

[mark krawczuk]

hi, i have  some scanned  pages from "high performance electronic projects
for efi cars" or sumthin like that , and it has a pulse width idicator ..
u want me to email it to you ???

mark k


---------------------------------------------------------------------
"Are you still wasting your time with spam?...
There is a solution!"

Protected by GIANT Company's Spam Inspector
The most powerful anti-spam software available.
http://mail.spaminspector.com


----- Original Message -----
From: "Marcello A. Belloli" <mbelloli at speedymotorsports.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, May 22, 2005 1:00 PM
Subject: [Diy_efi] Measuring Pulse Width/Duty Cycle of an Injector?


> Hello Everyone,
>      I'm still working on a datalogger project.  Been doing a lot of the
> software while I've been on vacation in Thailand. I'm still on
> vacation, but can't keep my mind off of this project.  I'm using a
> PIC18F452 as the Micro behind my datalogger.  I've got just about
> everything working.  The one place I'm having problem is the
> understanding of how to read pulse width of a fuel injector.
>      Is there a way of looking at all types of injectors, that will allow
> for an accurate account of timing?  I've been looking at two type of
> injector firing.  Low resistance injectors, which use a driver that
> duty cycles the injectors after the main firing to keep the current
> within limits.  And Higher resistance ones where the resistance alone
> keeps the current down.  Now how do you look at firing time of an
> injector when the driver starts to duty cycle it after 1.2ms?
>      I guess I have one more question too - What is the best way to
> connect to a circuit like an injector driver output?  I figure I only
> really need timing information.  I want to keep the voltage between
> 0-5 volts and apply as little load to the circuit as possible.
>      After looking at this I can understand why my multimeter that has a
> PulseWidth setting has trouble sometimes.
>      Any ideas would be great.    Thanks,  Marcello
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/diy_efi
>
>
>