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Date: Thu, 21 Oct 2004 14:20:33 +1300
From: Richard Sutherland-Smith <richard.ssnospamr.net.nz>
Subject: Re: 9-5 2.3lpt PCV/breather hose burst


In message <4176f3d7$0$23009$5a62ac22nospamqv1-newsreader-01.iinet.net.au> "Justin" <splitscreennospamt.net.au> wrote: > > "Richard Sutherland-Smith" <richard.ssnospamr.net.nz> wrote in message > news:f36d8bfd4c.Richardnospamard.ss.clear.net.nz... > > In message <2t5gloF1pdu7jU1nospamberlin.de> > > Dave Hinz <DaveHinznospamcop.net> wrote: > > > >> On Thu, 14 Oct 2004 08:53:21 +1300, Richard Sutherland-Smith > >> <richard.ssnospamr.net.nz> wrote: > >> > In message <2t4qipF1rt7l7U1nospamberlin.de> > >> > Dave Hinz <DaveHinznospamcop.net> wrote: > >> > > >> >> You're confusing timing with mixture. The engine management still > >> >> needs to > >> >> know the mass of the air in the chemical reaction so it can put the > >> >> right > >> >> amount of fuel into the chambers; the sensing plugs are for > >> >> determining > >> >> when to fire the spark. > >> > >> > No they are not, AFAIU they are to check the result of combustion. > >> > >> Nope. That's what the O2 sensor is for. Here's an article (in English > >> even) that goes into way more detail than you asked for, but, er, you > >> asked for it... > >> > >> http://www.vehicular.isy.liu.se/~larer/Projects/main.html > >> > >> It also has some good stuff on how water injection works in this > >> context. > >> > >> Dave Hinz > > > > Yes, I have read that before, but that only SEEMS to deal with the > > timing aspect of the plugs as sensors. Please don't tell me off again, > > I am very sensitive. I quote from The Saab publication (270603) 1997 > > Form and Function about Trionic. > > "By applying a relatively weak voltage (approx. 80V) to the spark plugs, > > we can measure the density of ions in each cylinder and thus determine > > whether combustion was complete or if a setting needs to be changed. > > .....it can adjust the quantity of fuel being injected during the brief > > moment the inlet valves are open...... which rations each and every drop > > of fuel and minimises exhaust emissions." > > Hilsen > > -- > > > > Richard Sutherland-Smith > > 19 Webb Road, Wanganui 5001, > > New Zealand > I'm not going to tell you off but I am going to tell you that you are wrong. > The D.I unit or the sparkplugs can not detect combustion mixtures. The > system of applying a weak voltage to the sparkplugs is to detect which > cylinder is on compression stroke. It does this by measuring the voltage at > the plugs that is not enough to jump the gap, but as the compression goes up > the voltage will go up as the amount of air in between the gap will > increase. There are also sensors in the D.I unit to detect knocking. The > mixture is determined in a Trionic 7 system by the air mass meter and the > two map sensors, and then is fine tune by the readings of the o2 sensor > (which there is two in later models). > > > Ok, I will tell SAAB that there own publication is wrong, and they ought to read this newsgroup to find out how their engines work;-( Oh, I see he is an Aussie!! War is declared! -- Richard Sutherland-Smith 19 Webb Road, Wanganui 5001, New Zealand

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