Injector Duty Monitor

[Bruce Plecan]

-----Original Message-----
From: steve ravet <Steve.Ravet at arm.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, January 04, 1999 12:46 PM
Subject: Re: Injector Duty Monitor

Yes, but after you do the zip thing.........  He mentioned pwmeter, which is
zip,
ya fine, unzip, and I still can't see anything, other than a drop down
window.
Just for grins try something with a .asm file extension, on a windows
machine.
Some of us don't make a living with this stuff, and hit dead ends.
  Yes I do have the winzip, and that ain't the problem.  It's what comes
next......
Bruce
  Sorry but I've asked this a couple times and all I get is use winzip, and
that
has nothing to do with what I'm asking..



Depends on the file type.  For most of the files on the FTP site,

I'm not asking about most, I'm asking about pwmeter........

 you
>just select "save to disk" or something like that and tell it where to
>save it.  Netscape asks you that when it sees a file type that it
>doesn't know how to display (like .zip, .exe, others).  If you download
>and install winzip (like from www.shareware.com) it'll "register" the
>.zip extension, so the next time you click on a .zip file netscape will
>know to run winzip for it.  Same with .pdf if you install acrobat
>reader, etc.
>
>As far as reading duty cycle, couldn't you make up a circuit with an
>opamp buffer, and a resistor/capacitor to filter the signal, then read
>the voltage with a digital voltmeter?  0v=0%, 12v=100%?

Ya, I could if I wanted to study to be an EE.  So I just plug along with
a dwell meter...
  If I wanted that thou, I wouldn't ask for the other.  I'd really like to
read to at least .x, if not .xx, thou.........
>
>Or, just go buy a cheap analog voltmeter with a needle.  It's reading
>will vary from 0-12 depending on duty cycle.
>
>--steve
>
>>
>> Hi
>>
>> I have some time ago posted a file to the ftp site in the incoming
>> directory.The name of the file is pwmeter.zip
>>
>> It  measures the on time of the injector in milliseconds to 0.1 ms
>> resolution if I remember correctly.Resolution could be increased.
>>
>> If somebody is willing to give me some idea or specification or an
>> example of what needs to be measured, I could change the code to do
>> this.
>> Is this referenced to rpm or is it just the on versus off time
>> of the injector.
>>
>> Regards
>> Georg
>> Georg Lerm
>> Chief Technician
>> Clinical Engineering
>> Red Cross Hospital
>> Cape Town
>> South Africa
>> Tel. +27 21 658-5120
>> Fax. +27 21 658-5120
>