Ed,
Those
perturbations you see are the result of engaging the pulse width addition
hardware and the readjustment of modes 3 and 2 along with a momentary manual
mixture change that was unnecessary. I should have labeled three regions
on the plot with the area you are referring to as a readjustment
period.
That
plot was a quick attempt at showing the effect of the pulse width addition in a
single session. The adjustments were probably not the best since it was
cold, windy, and our latest snowstorm was just getting started. Since this
data was collected in my back yard, I try to keep the sessions short for the
neighbor’s benefit. So far, though, the horses just across the alley
are the only neighbors that have shown any interest.
I
suspect that adding the injector lag time is a large part of what adjusting the
MAP table is doing when using either of the two tuning methods described
previously. The second method may be easier just because the step in the
table at staging has already been eliminated.
Steve
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed
Anderson
Sent: Wednesday, March 09, 2011 10:12 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: more staging and
tuning
I presume the
perturbation we see in the right side of left plot (Tuning Plot1.jpg) as
you decrease engine rpm (and I see a tweak of the manual mixture control --
perhaps to keep the engine from dying?) - the O2 sensor bobbing between rich and
lean. I do not see that pertubation on the right plot - is this
(bobbing between rich and lean) due to the controller causing the
injectors to actually cut off (not open) due to the 1.2 msec delay not being
compensated for???
If one had the
controller map math, it might be possible to add the "1.2msec" of fuel
missing by increasing the MAP value in each bin??? However, I
guess (even if possible) it would be easier to compensate by using your method 1
or 2.
Good work, really
appreciate you sharing it with us