When to go into Closed-Loop?

[Bob McElroy]

Ok... I have the Oxy sensors biased to ground (I figure I won't need =
that low
reading) with a 1M resistor.  I was planning on going into closed loop =
as=20
soon as I get >0.2V on the sensor.... any comments?

  How do the "big boys" know when to go into closed loop?
_______________________________


I'm not familiar with the actual inner workings of the "big boys" EFI =
systems, but I can tell you how I intend to determine when to go into =
closed loop.  Basically, I will look at engine temperature (is it at =
least one-half of the way to normal operating temp.), throttle position =
(I don't want to go into closed loop at <10% throttle/idle or >90% =
throttle/WOT), and engine speed (am I running at higher than normal =
engine speed and/or accelerating hard, but not at WOT.)  I have been =
working on defining what parameters I need to watch in order to =
implement a fully developed EFI system.  I have not implemented any of =
this yet, and I do expect that there may be other things I need to take =
into consideration.  Anyone know of other things to monitor to determine =
if closed loop is appropriate?


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"Two things are infinite, the universe and human stupidity"
"When everyone is in agreement, it signifies that no one thought very =
hard."
							       - Albert Einstein

Bob McElroy
Manufacturing Engineer
Midcom, Inc.
Waverly, IA
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