Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 06 Jun 2003 10:31:21 -0400 Message-ID: X-Original-Return-Path: Received: from mail.indian-creek.net ([209.176.40.9] verified) by logan.com (CommuniGate Pro SMTP 4.1b7) with ESMTP id 2405146 for lml@lancaironline.net; Fri, 06 Jun 2003 10:27:58 -0400 Received: from VAIO (sl6.du.indian-creek.net [209.176.40.22] toucan@78055.com) by mail.indian-creek.net with SMTP (IOA-IPAD 3.75d/96) id 1258300 for ; Fri, 06 Jun 2003 09:28:35 -0500 X-Original-Message-ID: <001c01c32c37$d15d4540$1628b0d1@VAIO> From: "Jim Cameron" X-Original-To: "Lancair Mailing List" Subject: Oxygen in exhaust gases; sensors for same X-Original-Date: Fri, 6 Jun 2003 09:27:51 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01C32C0D.E6FDDE20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2727.1300 This is a multi-part message in MIME format. ------=_NextPart_000_0019_01C32C0D.E6FDDE20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The sensors used in automotive systems are of a type called zirconia = sensors. At high temperatures (like those in the exhaust gas stream) = they act as oxygen electrodes, with a very high sensitivity and quick = response (milliseconds). The sensors are used in a feedback loop to = control the air/fuel mix, partly to enhance engine efficiency, and = partly to meet current smog regulations. At LOP mixes, they sensor does see a small amount of free oxygen in = the exhaust gas stream -- otherwise the whole scheme wouldn't work. As others have pointed out, the sensors, unfortunately, are = "poisoned" by lead in gasoline, so they would be of little use in = engines burning 100LL. Too bad, because otherwise it would be a pretty = simple matter to provide automatic mixture control. Jim Cameron (Waiting for a Legacy) ------=_NextPart_000_0019_01C32C0D.E6FDDE20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
   The sensors used in = automotive systems=20 are of a type called zirconia sensors.  At high temperatures (like = those in=20 the exhaust gas stream) they act as oxygen electrodes, with a very high=20 sensitivity and quick response (milliseconds).  The sensors are = used in a=20 feedback loop to control the air/fuel mix, partly to enhance engine = efficiency,=20 and partly to meet current smog regulations.
   At LOP mixes, they sensor = does see a=20 small amount of free oxygen in the exhaust gas stream -- otherwise the = whole=20 scheme wouldn't work.
    As others have = pointed out, the=20 sensors, unfortunately, are "poisoned" by lead in gasoline, so they = would be of=20 little use in engines burning 100LL.  Too bad, because otherwise it = would=20 be a pretty simple matter to provide automatic mixture = control.
 
Jim Cameron
(Waiting for a Legacy)
 
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