Date: Fri, 25 Jul 2003 15:17:00 +0100 From: "Andy Hookins" <andrew.hookinsnopsamamnopsamodata.co.uk> Subject: Re: Gas economy
"Goran Larsson" <hohnopsamlid.invalid> wrote in message news:HIL041.Jt1nopsamove.se... > In article <t40Ua.37310$Ii1.830nopsam02.bloor.is.net.cable.rogers.com>, > Smoky <gopher_gutsnopsamail.com> wrote: > > > The EDU "does not" measure > > anything. It is just an electronic "best guess" and always assumes a > > perfectly tuned engine the same as the day it was made. > > The EDU measures two signals for its fuel consumtion numbers. One signal > is the distance driven, i.e. the same signal that is used by the > speedometer, odometer, and some other functions in the EDU. The other I defer to your knowledge over my speculation (i.e. my previous post elsewhere in this thread). I just assumed that the EDU is a dumb display driver, but you say it has signal acquisition and computational abilities, is that right? > signal is the time the injection valves are open. As the volume that > passes through the injection valves over a certain time is known it is > easy for the EDU to calculate the fuel volume used. Later Saabs with This description implies to me that there is another method of determining fuel used - maybe the fuel tank sender, to compensate for diffeences in fuel injector characteristics. Is that what you are saying or am I just reading more into this than I should? AndyH '94 9000 CDE
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