X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=O/h7h11W c=1 sm=1 tr=0 a=nUkCw4zFzSTvJj5Cg0yrXA==:117 a=JBFolyDoGHsA:10 a=hfb1SqhoAAAA:8 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=HZJGGiqLAAAA:8 a=7g1VtSJxAAAA:8 a=4w41nhmzyIulWrH5LlMA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=clPTvaOYeYMP6P_qTaUA:9 a=vPLuG3Jlx-ggmMzK:21 a=kwVnIJO-hb1ZVV62EN53:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "Andrew Martin andrew@martinag.com.au" Received: from mail-qt0-f172.google.com ([209.85.216.172] verified) by logan.com (CommuniGate Pro SMTP 6.2.7) with ESMTPS id 11663982 for flyrotary@lancaironline.net; Wed, 19 Sep 2018 20:35:06 -0400 Received-SPF: none receiver=logan.com; client-ip=209.85.216.172; envelope-from=andrew@martinag.com.au Received: by mail-qt0-f172.google.com with SMTP id z8-v6so6928935qto.9 for ; Wed, 19 Sep 2018 17:35:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=martinag-com-au.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=/2/5rQSXNYQ4z6spw1bkWuFPAW7FlKWPgl3rv0LroTo=; b=MUTGbsh+N1zUU/1TVfj0u2HEwvNJyOz/4mTgg210NYFzL3+n9bhlHVllDwZ+jjXWc9 ft0ZJgYVwU6d4/BWnajgF3pboGiLSMSvvhP9SgcDzLe/U7MpY35WEDyoOVlXYfnuJVb7 lKQuYd8o3o5Fs2EFbNheHOVIq1Lj0WyaNJ2MrwwVJCtBadlrdWcaCFN11XaU0Sne9gc6 TzC+BVrfN0dnMUGS4JSMZ6emDDF/PLqrMfc+OOcnvrxrB2YBUvthzePBzYADduQmhE2f 9eb/tyLsmNR9W6pSfzLPdjlnru8cS7w9oFsSyTyIAHEiQjDJY7CDkSws7zUk13EKI3BC anmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=/2/5rQSXNYQ4z6spw1bkWuFPAW7FlKWPgl3rv0LroTo=; b=c9buwmZ8wT0/so98RmuOAP9qjCM5qgL6cQRv9QdOE3S2xTWzNqbAD5uR56AaJ7tZl+ pFmXjU9ImXGXAiRoaJtk0e60QBtZ6Ef0Eub+1Xt4xjKLkozy+CEbM4kaC2dQgmhH0wkU mqMOHeBPEfiA7YOzbFKhbX8Xatjiiyh+8mR2ej19PHG6eU4XxHyCZsas+o88CR26QVhb FFlQ0/d4Swa5VmX2oqLVLg4XDV1Cyl5ycDcJPwyX/EHJrKDSoDB9imQiQaLgzbD/o5cG hwmHrzw712XezVhhWo+GmccgPQzZlijiXZJtdmey0HXCaQXXekFjcFd0LK+Pzf/vWOci ZAmw== X-Gm-Message-State: APzg51DbYFiRJuTKix6QUajlowwLcAohmySv5YL9HOV80uMxhpjCYJyN s5FVgrh/apVG+PQ7YwCqHnKHlMjQvJktPYs/2IneXTs= X-Google-Smtp-Source: ANB0VdYFbdkyWVp9AGy3UKfI//ZUDMlXnirBdSxB4V0Z3PMu2QwckxaWRVrr/YEbFx0UW6LY6CWhb2bq7xSoKT63GXM= X-Received: by 2002:ac8:47cf:: with SMTP id d15-v6mr26182196qtr.24.1537403689124; Wed, 19 Sep 2018 17:34:49 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Thu, 20 Sep 2018 08:34:37 +0800 Message-ID: Subject: Re: [FlyRotary] Re: ECU - Megasquirt geared towards planes To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000c457d3057642b0aa" --000000000000c457d3057642b0aa Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Matt. Doesnt that require the AFR sensor to be part of the control circuit? I prefer Tracy=E2=80=99s approach that uses AFR as an indicator for manual ajustment and setting MAP tables. That way if Avgas fouls the sensor it does not affect ECU operation. Btw. For anyone in Aus, Spartan2 wideband units are available from https://www.justraceparts.com.au , they are way over the other side of the country in Brisy though, their pressure & temp sensors are really good value also. Andrew On Thu, 20 Sep 2018 at 7:05 am, Matt Boiteau mattboiteau@gmail.com < flyrotary@lancaironline.net> wrote: > I always ask the question, Is there a mixture knob in a modern car? Long > gone are the days of carburetors. > With EFI computers, they use a table (RPM vs MAP) to indicate which AFR t= o > target. Megasquirt does an excellent job of this. Once you get your engin= e's > volumetric efficiency table dialed in, all you have to do is change your > AFR and MS will calculate your fueling to reach that AFR. > > - Matt Boiteau > > On 2018-09-18 11:27:40 AM, Ernest Christley echristley@att.net < > flyrotary@lancaironline.net> wrote: > > > On Monday, September 17, 2018 11:56 PM, "Matt Boiteau > mattboiteau@gmail.com" wrote: > And I still haven=E2=80=99t been convinced of a mixture knob. Let the ECU= talk > with the wideband & baro and do the work for you. > > - Matt Boiteau > > > For mixture, one of the things you have to keep in mind is that there are > situations where you'll want different mixtures that the computer can't > know about. For example, you want to go full rich on take off and landin= g, > but lean out for cruise. How will the computer know what is appropriate = at > which time? > > I got around it by adding a pot to my throttle control and used it as the > throttle position sensor. The first half of travel controlled the thrott= le > body cable, and the mixture was tuned lean until the throttle was > completely open. The second half of the control lever travel increased t= he > amount of fuel in the mixture, with it topping out at about 12:1. > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --=20 Regards Andrew Martin Martin Ag --000000000000c457d3057642b0aa Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Matt. Doesnt that require the AFR sensor to be = part of the control circuit? I prefer Tracy=E2=80=99s approach that uses AF= R as an indicator for manual ajustment and setting MAP tables. That way if = Avgas fouls the sensor it does not affect ECU operation.
<= div dir=3D"auto">
Btw. For anyone in Aus, Sparta= n2 wideband units are available from =C2=A0https://www.justraceparts.com.au , they are way over the o= ther side of the country in Brisy though, their pressure & temp sensors= are really good value also.

Andrew

= On Thu, 20 Sep 2018 at 7:05 am, Matt Boiteau mattboiteau@gmail.com <flyrotary@lancaironline.ne= t> wrote:
I always ask the question, Is there= a mixture knob in a modern car? Long gone are the days of carburetors.With EFI computers, they use a table (RPM vs MAP) to indicate which AFR to= target. Megasquirt does an excellent job of this. Once you get your=C2=A0<= span style=3D"font-size:10pt;line-height:1.5">engine's volumetric effic= iency table dialed in, all you have to do is change your AFR and MS will ca= lculate your fueling to reach that AFR.=C2=A0

- Matt Boiteau

On 2018-= 09-18 11:27:40 AM, Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote= :



On Monday, September 17, 2018 11:56 PM, &quo= t;Matt Boiteau m= attboiteau@gmail.com" <flyrotary@lancaironline.net> wrote:
And I still haven=E2= =80=99t been convinced of a mixture knob. Let the ECU talk with the wideban= d & baro and do the work for you.

- Matt Boiteau


For mixture, one of the things you have to keep in = mind is that there are situations where you'll want different mixtures = that the computer can't know about.=C2=A0 For example, you want to go f= ull rich on take off and landing, but lean out for cruise.=C2=A0 How will t= he computer know what is appropriate at which time?

I got around it by ad= ding a pot to my throttle control and used it as the throttle position sens= or.=C2=A0 The first half of travel controlled the throttle body cable, and = the mixture was tuned lean until the throttle was completely open.=C2=A0 Th= e second half of the control lever travel increased the amount of fuel in t= he mixture, with it topping out at about 12:1.
--
Homepage:=C2=A0 http://www.flyrotary.com/
Archive and UnSub:=C2=A0 =C2=A0http://mail= .lancaironline.net:81/lists/flyrotary/List.html
--
Regards Andrew Martin Martin Ag
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