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Message-ID: <627245.19943.qm@web83914.mail.sp1.yahoo.com>
References: <list-4900772@logan.com>
Date: Wed, 9 Mar 2011 08:58:06 -0800 (PST)
From: Kelly Troyer <keltro@att.net>
Subject: more staging and tuning
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-4900772@logan.com>
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Steve,=0A=C2=A0=C2=A0=C2=A0 Is the hardware addition to implement the 1.2 m=
s increase to injector=C2=A0pulse =0Awidth=0Ado-able by the unwashed withou=
t totally screwing up their EC2-3 in your =0Aopinion.....=0A=C2=A0=C2=A0=C2=
=A0 I=C2=A0was Avionics Tech in Navy and diagnosed and repaired mini comput=
er boards=0Afor ATT-Lucent..........=0A=0A=0AKelly Troyer=0A"DYKE DELTA JD2=
" (Eventually)=0A"13B ROTARY"_ Engine=0A"RWS"_RD1C/EC2/EM2=0A"MISTRAL"_Back=
plate/Oil Manifold=0A"TURBONETICS"_TO4E50 Turbo=0A=0A=0A=0A=0A_____________=
___________________=0AFrom: Steven W. Boese <SBoese@uwyo.edu>=0ATo: Rotary =
motors in aircraft <flyrotary@lancaironline.net>=0ASent: Wed, March 9, 2011=
 10:19:37 AM=0ASubject: [FlyRotary] more staging and tuning=0A=0A=0AFor tho=
se of you who made it to the end of my long post a couple of days ago =0Awh=
ere only two of the three methods I=E2=80=99ve used in dealing with injecto=
r lag were =0Adescribed, here is the third:=0A=C2=A0=0AThe two methods of d=
ealing with injector lag described previously could be =0Aconsidered as wor=
king around the basic problem more than a solution to it.=C2=A0 =0AAlthough=
 the best way to deal with the injector lag effect might be to =0Acompensat=
e for it in the controller firmware, we do not have that ability in the =0A=
field.=C2=A0 Purely as a proof of concept exercise, 1.2 ms was always added=
 to each =0Ainjector pulse by the addition of hardware.=C2=A0 The results a=
re shown in the =0Aattached data plots.=C2=A0 The data was collected direct=
ly from the EC2=E2=80=99s into an =0AIPAQ.=0A=C2=A0=0APlot 1 shows two idle=
 to full throttle back to idle sequences.=C2=A0 Both sequences =0Awere gene=
rated after adjusting modes 3 and 2, but leaving the rest of the EC2 =0Apar=
ameters and the MAP table at factory defaults.=C2=A0 Data for the manual mi=
xture =0Aadjustment and the table value are included to show that no change=
s in these =0Aparameters occurred during the power sweeps.=C2=A0 The green =
line near the bottom =0Alabeled =E2=80=9Cstaged x 10=E2=80=9D is the logic =
signal from the EC2 that is =E2=80=9C1=E2=80=9D when the MAP =0Ais below th=
e staging threshold and =E2=80=9C0=E2=80=9D when the MAP is above the stagi=
ng =0Athreshold.=C2=A0 These values were multiplied by ten so the staging t=
ransitions would =0Abe easy to pick out in the plots.=C2=A0 The data on the=
 left is with the normal =0Ainjector pulses while the data on the right is =
with the addition of 1.2 ms to =0Aeach injector pulse.=C2=A0 In each case, =
the oxygen sensor shows a somewhat rich =0Amixture just prior to staging.=
=C2=A0 With MAP above the staging threshold, the O2 =0Asensor shows a chang=
e to a lean mixture for the normal injector pulse whereas =0Athere is no st=
aging mixture change when 1.2 ms has been added to each pulse.=C2=A0 It =0A=
is important to understand that the 1.2 ms is added to the injector pulses =
at =0Aall times, not just after crossing the staging threshold.=C2=A0 A dec=
rease in RPM is =0Aalso seen when the O2 sensor goes lean when the normal p=
ulses are used.=C2=A0 =0A=0A=C2=A0=0AIt could be argued that the mixture wa=
s more rich to begin with for the sequence =0Awith the added 1.2 ms and tha=
t is true.=C2=A0 For this reason I've included plot 2.=C2=A0 =0AThis is a p=
lot of data resulting from a previous similar experiment with the =0Aadded =
1.2 ms but starting with a leaner condition.=C2=A0 The prop loading was als=
o =0Adifferent, but the mixture is consistent throughout the power range.=
=C2=A0 Again, =0Athis is with all factory defaults except for modes 3 and 2=
.=C2=A0 It should also be =0Anoted that the MAP was limited to about 23 inc=
hes due to the density altitude of =0Aover 7200 ft at this location.=0A=C2=
=A0=0AThe simplified tuning as a result of adding the injector lag time to =
the =0Ainjector pulses has been demonstrated with my engine stand on the gr=
ound and =0Awith my plane on the ground as well as in flight.=C2=A0 The fav=
orable effect of this =0Aaddition is seen not only on staging but also poss=
ibly in the low power high RPM =0Adescent flight regime.=C2=A0 Although I d=
on=E2=80=99t have a lot of time in the plane yet =0Awith this set up, the r=
esults so far seemed to be worth reporting.=0A=C2=A0=0ASteve Boese=0ARV6A 1=
986 13B NA RD1A EC2
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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></he=
ad><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size:1=
4pt"><DIV></DIV>=0A<DIV>Steve,</DIV>=0A<DIV>&nbsp;&nbsp;&nbsp; Is the hardw=
are addition to implement the 1.2 ms increase to injector&nbsp;pulse width<=
/DIV>=0A<DIV>do-able by the unwashed without totally screwing up their EC2-=
3 in your opinion.....</DIV>=0A<DIV>&nbsp;&nbsp;&nbsp; I&nbsp;was Avionics =
Tech in Navy and diagnosed and repaired mini computer boards</DIV>=0A<DIV>f=
or ATT-Lucent..........</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>&nbsp;</DIV>=0A<P>=
Kelly Troyer<BR><STRONG><FONT size=3D4>"DYKE DELTA JD2"</FONT> <FONT size=
=3D1>(Eventually)</FONT></STRONG></P>=0A<P>"13B ROTARY"_ Engine<BR>"RWS"_RD=
1C/EC2/EM2<BR>"MISTRAL"_Backplate/Oil Manifold</P>=0A<P>"TURBONETICS"_TO4E5=
0 Turbo</P>=0A<DIV><BR></DIV>=0A<DIV style=3D"FONT-FAMILY: arial, helvetica=
, sans-serif; FONT-SIZE: 14pt"><BR>=0A<DIV style=3D"FONT-FAMILY: times new =
roman, new york, times, serif; FONT-SIZE: 12pt"><FONT size=3D2 face=3DTahom=
a>=0A<HR SIZE=3D1>=0A<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> =
Steven W. Boese &lt;SBoese@uwyo.edu&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: b=
old">To:</SPAN></B> Rotary motors in aircraft &lt;flyrotary@lancaironline.n=
et&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Wed, March =
9, 2011 10:19:37 AM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN>=
</B> [FlyRotary] more staging and tuning<BR></FONT><BR>=0A<STYLE><!--    _f=
iltered {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;}  _filter=
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mily:Consolas;panose-1:2 11 6 9 2 2 4 3 2 4;}   p.MsoNormal, li.MsoNormal, =
div.MsoNormal =09{margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-fa=
mily:"sans-serif";} a:link, span.MsoHyperlink =09{color:blue;text-decoratio=
n:underline;} a:visited, span.MsoHyperlinkFollowed =09{color:purple;text-de=
coration:underline;} p.MsoPlainText, li.MsoPlainText, div.MsoPlainText =09{=
margin:0in;margin-bottom:.0001pt;font-size:10.5pt;font-family:Consolas;} sp=
an.PlainTextChar =09{font-family:Consolas;} span.EmailStyle19 =09{font-fami=
ly:"sans-serif";color:windowtext;} .MsoChpDefault =09{font-size:10.0pt;}  _=
filtered {margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 =09{} --></STYL=
E>=0A=0A<DIV class=3DWordSection1>=0A<P class=3DMsoPlainText>For those of y=
ou who made it to the end of my long post a couple of days ago where only t=
wo of the three methods I=E2=80=99ve used in dealing with injector lag were=
 described, here is the third:</P>=0A<P class=3DMsoPlainText>&nbsp;</P>=0A<=
P class=3DMsoPlainText>The two methods of dealing with injector lag describ=
ed previously could be considered as working around the basic problem more =
than a solution to it.&nbsp; Although the best way to deal with the injecto=
r lag effect might be to compensate for it in the controller firmware, we d=
o not have that ability in the field.&nbsp; Purely as a proof of concept ex=
ercise, 1.2 ms was always added to each injector pulse by the addition of h=
ardware.&nbsp; The results are shown in the attached data plots.&nbsp; The =
data was collected directly from the EC2=E2=80=99s into an IPAQ.</P>=0A<P c=
lass=3DMsoPlainText>&nbsp;</P>=0A<P class=3DMsoPlainText>Plot 1 shows two i=
dle to full throttle back to idle sequences.&nbsp; Both sequences were gene=
rated after adjusting modes 3 and 2, but leaving the rest of the EC2 parame=
ters and the MAP table at factory defaults.&nbsp; Data for the manual mixtu=
re adjustment and the table value are included to show that no changes in t=
hese parameters occurred during the power sweeps.&nbsp; The green line near=
 the bottom labeled =E2=80=9Cstaged x 10=E2=80=9D is the logic signal from =
the EC2 that is =E2=80=9C1=E2=80=9D when the MAP is below the staging thres=
hold and =E2=80=9C0=E2=80=9D when the MAP is above the staging threshold.&n=
bsp; These values were multiplied by ten so the staging transitions would b=
e easy to pick out in the plots.&nbsp; The data on the left is with the nor=
mal injector pulses while the data on the right is with the addition of 1.2=
 ms to each injector pulse.&nbsp; In each case, the oxygen sensor shows a s=
omewhat rich mixture just prior to staging.&nbsp; With MAP above
 the staging threshold, the O2 sensor shows a change to a lean mixture for =
the normal injector pulse whereas there is no staging mixture change when 1=
.2 ms has been added to each pulse.&nbsp; It is important to understand tha=
t the 1.2 ms is added to the injector pulses at all times, not just after c=
rossing the staging threshold.&nbsp; A decrease in RPM is also seen when th=
e O2 sensor goes lean when the normal pulses are used.&nbsp; </P>=0A<P clas=
s=3DMsoPlainText>&nbsp;</P>=0A<P class=3DMsoPlainText>It could be argued th=
at the mixture was more rich to begin with for the sequence with the added =
1.2 ms and that is true.&nbsp; For this reason I've included plot 2.&nbsp; =
This is a plot of data resulting from a previous similar experiment with th=
e added 1.2 ms but starting with a leaner condition.&nbsp; The prop loading=
 was also different, but the mixture is consistent throughout the power ran=
ge.&nbsp; Again, this is with all factory defaults except for modes 3 and 2=
.&nbsp; It should also be noted that the MAP was limited to about 23 inches=
 due to the density altitude of over 7200 ft at this location.</P>=0A<P cla=
ss=3DMsoPlainText>&nbsp;</P>=0A<P class=3DMsoPlainText>The simplified tunin=
g as a result of adding the injector lag time to the injector pulses has be=
en demonstrated with my engine stand on the ground and with my plane on the=
 ground as well as in flight.&nbsp; The favorable effect of this addition i=
s seen not only on staging but also possibly in the low power high RPM desc=
ent flight regime.&nbsp; Although I don=E2=80=99t have a lot of time in the=
 plane yet with this set up, the results so far seemed to be worth reportin=
g.</P>=0A<P class=3DMsoPlainText>&nbsp;</P>=0A<P class=3DMsoNormal><SPAN st=
yle=3D"FONT-FAMILY: 'sans-serif'; COLOR: black; FONT-SIZE: 12pt">Steve Boes=
e</SPAN></P>=0A<P class=3DMsoNormal><SPAN style=3D"FONT-FAMILY: 'sans-serif=
'; COLOR: black; FONT-SIZE: 12pt">RV6A 1986 13B NA RD1A EC2</SPAN></P>=0A<P=
 class=3DMsoNormal>&nbsp;</P></DIV></DIV></DIV></div></body></html>
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