Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 557899 for flyrotary@lancaironline.net; Mon, 06 Dec 2004 14:23:15 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iB6JMekd008274 for ; Mon, 6 Dec 2004 14:22:42 -0500 (EST) Message-ID: <002501c4dbc8$b124fd30$2502a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Nice to Have Re: ECU oxygen sensor Date: Mon, 6 Dec 2004 14:20:48 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0022_01C4DB9E.C81101D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C4DB9E.C81101D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: ECU oxygen sensorI certainly would not draw that = conclusion, Bulent. I have found theLED A/F indictors such a good = indication of what my engine is doing that I would hesitate to fly = without it now. If the engine starts to stumble you immediately know = whether it because its too much or too little fuel - sort of nice to = know, trust me. {:>) Ed Anderson ----- Original Message -----=20 From: Bulent Aliev=20 To: Rotary motors in aircraft=20 Sent: Monday, December 06, 2004 2:04 PM Subject: [FlyRotary] Re: ECU oxygen sensor On 12/6/04 12:02 PM, "Russell Duffy" <13brv3@bellsouth.net> wrote: I have been looking at various ECUs trying to understand how they work. =20 Fortunately, I was on the phone, and Ed just saved me a lot of = typing :-) One additional note, ECU's can run in open loop, or closed = loop modes. Tracy's EC-2 is open loop all the time. Basically, in open = loop, you supply a pre-designated amount of fuel from a look-up table, = and you trust that it's what you wanted. When we tune the EC-2, we're = making this look-up table. In closed loop mode, you start with the look = up table number, then check the O2 sensor to see how close you came. = The ECU can add or remove fuel as needed to hit a target O2 number. Cars use closed loop whenever they can, or emissions and fuel = efficiency, but they also run in open loop mode under certain = conditions. For example, you're car will run in open loop mode when you = first start it, because there's no valid O2 sensor reading until it = warms up. Multi-wire heated O2 sensors have shortened this time = considerably over the years. I think most cars also run in open loop = mode during full throttle operation. Rusty =20 Sooo, I installed an 02 sensor for nothing? Bulent ------=_NextPart_000_0022_01C4DB9E.C81101D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: ECU oxygen sensor
I certainly would not draw that = conclusion,=20 Bulent.  I have found theLED  A/F indictors such a good = indication of=20 what my engine is doing that I would hesitate to fly without it = now.  If=20 the engine starts to stumble you immediately know whether it because its = too=20 much or too little fuel - sort of nice to know, trust me. = {:>)
 
Ed Anderson
 
 
----- Original Message -----
From:=20 Bulent=20 Aliev
Sent: Monday, December 06, 2004 = 2:04=20 PM
Subject: [FlyRotary] Re: ECU = oxygen=20 sensor

On = 12/6/04=20 12:02 PM, "Russell Duffy" <13brv3@bellsouth.net>=20 wrote:
I = have been=20 looking at various ECUs trying to understand how they
work.=20  

Fortunately, I was on the phone, = and Ed just=20 saved me a lot of typing :-)   One additional note, ECU's = can run=20 in open loop, or closed loop modes.  Tracy's EC-2 is open loop = all the=20 time.  Basically, in open loop, you supply a pre-designated = amount of=20 fuel from a look-up table, and you trust that it's what you wanted.=20  When we tune the EC-2, we're making this look-up table. =  In=20 closed loop mode, you start with the look up table number, then = check the O2=20 sensor to see how close you came.  The ECU can add or remove = fuel as=20 needed to hit a target O2 number.

Cars use closed=20 loop whenever they can, or emissions and fuel efficiency, but they = also run=20 in open loop mode under certain conditions.  For example, = you're car=20 will run in open loop mode when you first start it, because there's = no valid=20 O2 sensor reading until it warms up.  Multi-wire heated O2 = sensors have=20 shortened this time considerably over the years.   I think = most=20 cars also run in open loop mode during full throttle=20 operation.

Rusty=20    


Sooo, I installed = an 02 sensor=20 for nothing?
Bulent ------=_NextPart_000_0022_01C4DB9E.C81101D0--