[Diy_efi] Electronic expertise requested
Daniel R. Nicoson
A6intruder at adelphia.net
Wed Jun 18 22:27:27 GMT 2003
This is a multi-part message in MIME format.
------=_NextPart_000_0005_01C335C5.AFF081F0
Content-Type: multipart/alternative;
boundary="----=_NextPart_001_0006_01C335C5.AFF38F30"
------=_NextPart_001_0006_01C335C5.AFF38F30
Content-Type: text/plain;
charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Aaron,
I appreciate the reply. That's what I was looking for. My application =
is in an experimental aircraft so some form of switch would have to be =
used rather than plug and play.
I will have to admit that I am affected by traditional aircraft =
mentality that has always used two magnetos. They originally were fairly =
failure prone in the early years (20's & 30's) and some will argue that =
they are still unreliable and that's why a brand new Cessna 172 has two =
magnetos.
If one of these injector drivers fails, does it fail in the high =
impedance state so that the other EEC would function Ok or would the =
failed driver act as a short to the second (now functioning) EEC?
Thank you,
Dan
-----Original Message-----
From: Littich, Aaron Michael (UMR-Student) =
[mailto:diy_efi-bounces at diy-efi.org]On Behalf Of Littich, Aaron Michael =
(UMR-Student)
Sent: Wednesday, June 18, 2003 4:45 PM
To: List for general do-it-yourself EFI talk
Subject: RE: [Diy_efi] Electronic expertise requested
What your wanting sounds very possible, and i don't see how any =
problems with dual ecu's would arise other than the fact of deciding =
which one to use.
The Injector drivers are usually FET's, which when "off" are in =
high-impedance state. =20
The easiest way to provide redudancy would just be to carry around an =
extra EEC and only connect it when needed. The EEC-IV has ONE big =
connector. Keep in mind that it is extremely rare for an EEC to go bad, =
the only real things that can happen is the injector driver circuitry =
overheats, or the program memory is erased by a faulty EPROM/flash. =20
Just my thoughts,
Aaron
------=_NextPart_001_0006_01C335C5.AFF38F30
Content-Type: text/html;
charset="utf-8"
Content-Transfer-Encoding: quoted-printable
=EF=BB=BF<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE></TITLE>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8">
<META content=3D"MSHTML 6.00.2800.1170" name=3DGENERATOR></HEAD>
<BODY dir=3Dltr>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2>Aaron,</FONT></SPAN></DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2>I=20
appreciate the reply. That's what I was looking for. My =
application=20
is in an experimental aircraft so some form of switch would have to be =
used=20
rather than plug and play.</FONT></SPAN></DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2>I will=20
have to admit that I am affected by traditional aircraft mentality that =
has=20
always used two magnetos. They originally were fairly failure prone =
in the=20
early years (20's & 30's) and some will argue that they are still =
unreliable=20
and that's why a brand new Cessna 172 has two =
magnetos.</FONT></SPAN></DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2>If one=20
of these injector drivers fails, does it fail in the high impedance =
state so=20
that the other EEC would function Ok or would the failed driver act as a =
short=20
to the second (now functioning) EEC?</FONT></SPAN></DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2>Thank=20
you,</FONT></SPAN></DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2>Dan</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> Littich, Aaron =
Michael=20
(UMR-Student) [mailto:diy_efi-bounces at diy-efi.org]<B>On Behalf Of =
</B>Littich,=20
Aaron Michael (UMR-Student)<BR><B>Sent:</B> Wednesday, June 18, 2003 =
4:45=20
PM<BR><B>To:</B> List for general do-it-yourself EFI =
talk<BR><B>Subject:</B>=20
RE: [Diy_efi] Electronic expertise requested<BR><BR></FONT></DIV>
<DIV>
<DIV><FONT size=3D2>What your wanting sounds very possible, and i =
don't see how=20
any problems with dual ecu's would arise other than the fact of =
deciding which=20
one to use.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>The Injector drivers are usually FET's, which when =
"off" are=20
in high-impedance state. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>The easiest way to provide redudancy would just be =
to carry=20
around an extra EEC and only connect it when needed. The EEC-IV =
has ONE=20
big connector. Keep in mind that it is extremely rare for an EEC =
to go=20
bad, the only real things that can happen is the injector driver =
circuitry=20
overheats, or the program memory is erased by a faulty =
EPROM/flash. =20
</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Just my thoughts,</FONT></DIV>
<DIV><FONT size=3D2>Aaron</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT =
size=3D2></FONT> </DIV></DIV></BLOCKQUOTE></BODY></HTML>
------=_NextPart_001_0006_01C335C5.AFF38F30--
------=_NextPart_000_0005_01C335C5.AFF081F0
Content-Type: application/ms-tnef;
name="winmail.dat"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="winmail.dat"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------=_NextPart_000_0005_01C335C5.AFF081F0
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi
------=_NextPart_000_0005_01C335C5.AFF081F0--
More information about the Diy_efi
mailing list