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Joe, Tracy's EC2 EFI controller does not use any O2 sensor information. For
most airborne application, it is used to provided an indication of air/fuel
ratio by lighting up one of series of LED diodes (usually 10) that
correspond to a certain voltage level of the O2. This voltage level in turn
is dependent on the amount of oxygen present in the exhaust. Lots of oxygen
indicates your are lean (could dump more fuel in), minimal oxygen indicates
rich as you have/are burning most of the oxygen in the incoming air.
The automobile EFI controller uses the O2 sensor to maintain a
stoichiometric ratio of 14.7:1 for emission purposes. It senses the O2
output in millisecond intervals and uses this to adjust the air/fuel ratio
to maintain the correct ratio. Here is the URL for a fairly informative
article on O2 sensors. http://www.autospeed.com.au/cms/A_0618/article.html
An O2 sensor can be rendered useless for the automobile use reportedly after
a few seconds/minutes of exposure to leaded gas such as 100LL. However,
that does not render it useless as an air/fuel indicator - I get approx 100
hours on 100LL before the O2 sensor starts to lose responsiveness. If you
use Mogas you would probably get much more.
Hope this helps
Ed
----- Original Message -----
From: "Joseph M Berki" <Joseph.M.Berki@grc.nasa.gov>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, December 06, 2004 10:17 AM
Subject: [FlyRotary] ECU oxygen sensor
I have been looking at various ECUs trying to understand how they
work. How does an ECU that uses an oxygen sensor for mixture control fair
when 100LL is used? Does the mixture control in Tracy's unit replace the
oxygen sensor? Thanks for any help.
Joe Berki
Limo EZ
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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