[Diy_efi] Electronic expertise requested

Daniel R. Nicoson A6intruder at adelphia.net
Wed Jun 18 22:27:27 GMT 2003


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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


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=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">
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<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>&nbsp;</DIV>
<DIV><SPAN class=3D170040723-18062003><FONT face=3DArial color=3D#0000ff =
size=3D2>I=20
appreciate the reply.&nbsp; That's what I was looking for.&nbsp; 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>&nbsp;</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.&nbsp;They originally were fairly failure prone =
in the=20
early years (20's &amp; 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>&nbsp;</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>&nbsp;</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>&nbsp;</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>&nbsp;</DIV>
  <DIV><FONT size=3D2>The Injector drivers are usually FET's, which when =
"off" are=20
  in high-impedance state.&nbsp; </FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</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.&nbsp; The EEC-IV =
has ONE=20
  big connector.&nbsp; 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.&nbsp;=20
  </FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2>Just my thoughts,</FONT></DIV>
  <DIV><FONT size=3D2>Aaron</FONT></DIV>
  <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT =
size=3D2></FONT>&nbsp;</DIV></DIV></BLOCKQUOTE></BODY></HTML>

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