[Diy_efi] GM TBI electrical details
Frank McCracken
frankmccracken at shaw.ca
Thu Dec 16 16:04:22 GMT 2004
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Thanks fella's
WSCowell at aol.com wrote:=20
The 5 Volt rail is derived internally in the ECU for the logic =
circuitry inside, including the microprocessor. A regulator chip =
accepts the vehicle's 12v (nominal) supply and "drops" it to 5v which is =
the maximum that normal logic devices, by long-established convention, =
tend to use. =20
The injector driver transistors would use a signal from the logic =
circuitry swinging from ground to +5volt and translate this to an =
"on/off" conductive path for the "ground return" from 12volt through the =
injectors to ground. This is a simplification, but not much of one. =
There are plenty of basic electronics textbooks and application notes =
out there if you scratch around a bit. Enjoy!
Will
G0OPL
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<DIV style=3D"FONT: 10pt arial"><FONT size=3D3>Thanks =
fella's</FONT></DIV>
<DIV style=3D"FONT: 10pt arial"><STRONG><EM></EM></STRONG> </DIV>
<DIV style=3D"FONT: 10pt arial"><B><I>WSCowell at aol.com</I></B> wrote: =
</DIV>
<DIV>
<BLOCKQUOTE class=3Dreplbq=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px =
solid">
<META content=3D"MSHTML 6.00.2900.2523" name=3DGENERATOR><FONT =
id=3Drole_document=20
face=3DArial color=3D#000000 size=3D2>
<DIV>The 5 Volt rail is derived internally in the ECU for the logic=20
circuitry inside, including the microprocessor. A regulator =
chip=20
accepts the vehicle's 12v (nominal) supply and "drops" it to 5v =
which is the=20
maximum that normal logic devices, by long-established convention, =
tend to=20
use. </DIV>
<DIV> </DIV>
<DIV>The injector driver transistors would use a signal from the =
logic=20
circuitry swinging from ground to +5volt and translate this to an =
"on/off"=20
conductive path for the "ground return" from 12volt through the =
injectors to=20
ground. This is a simplification, but not much of one. =
There are=20
plenty of basic electronics textbooks and application notes out =
there if you=20
scratch around a bit. Enjoy!</DIV>
<DIV> </DIV>
<DIV>Will</DIV>
=
<DIV>G0OPL</DIV></FONT>_______________________________________________<BR=
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<P>__________________________________________________<BR>Do You=20
Yahoo!?<BR>Tired of spam? Yahoo! Mail has the best spam protection =
around=20
<BR>http://mail.yahoo.com=20
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<P></P>_______________________________________________<BR>diy_efi =
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