EGOR Output Signal Survey
Bruce
nacelp at bright.net
Thu May 17 20:59:08 GMT 2001
I've already started my own version of that.
Almost 2/3 of the archives are addresses and non EFI stuff. distilling it
makes it an excellent read
Bruce
From: "Marteney, Steven J." <smarteney at xlvision.com>
Subject: RE: EGOR Output Signal Survey
> Funny you should mention that, packaging up the archives. I've been
rather
> unhappy with GM High Tech Performance mag (not to mention Hot Rod and all
> the other ads.) I have been seriously considering printing out about 30+
> pages of the archives at a time, once a month, and cancelling my magazine
> subscriptions. (I'm not joking either!)
> Steve
>
> -----Original Message-----
> From: Bruce Plecan [mailto:nacelp at bright.net]
> Sent: Wednesday, May 16, 2001 2:57 PM
> To: gmecm at diy-efi.org
> Subject: Re: EGOR Output Signal Survey
>
>
>
> They are quickly joining the ranks of just being one large ad.
> Last advertising for an editor was just worring about him being an English
> Major.
> We ought to package the archives up, and just sell em couple pages a
month,
> at least there would be some accurate auto material out there
> Bruce
>
>
>
> From: <don.broadus at exeloncorp.com>
> Subject: RE: EGOR Output Signal Survey
>
>
> > The July 2001 issue of circle track magazine has
> > an article on A/F Ratio measurement for power.
> > Powertrain Electronics Co.
> > www.powertrain.net
> > AFM1000 wide range exhaust gas sensor
> > I haven't checked the site yet but the article
> > looks good. Don
> >
> > > -----Original Message-----
> > > From: Bruce Plecan [SMTP:nacelp at bright.net]
> > > Sent: Wednesday, May 16, 2001 9:11 AM
> > > To: gmecm at diy-efi.org
> > > Subject: Re: EGOR Output Signal Survey
> > >
> > >
> > > > The first item is the Rcal resistor, the resistor
> > > > built into each wideband sensor at the factory
> > > > to cancel differences between sensors. A simple
> > > > circuit has been designed to use this feature, and
> > > > I think it should be included in any group design.
> > >
> > > Definetely
> > >
> > > > Next is the output voltage. A curve seen in some
> > > > equipment reads like
> > > > A/F Volts
> > > > 22:1 3.5
> > > > 14.57:1 3.0 stoich
> > > > 10.5:1 2.0
> > > > A circuit from the list runs about 0.5 V lower
> > > > than above, but otherwise the same. My ckt
> > > > runs 0.2 V lower than above. I propose we use
> > > > a design that can produce any of the above by
> > > > changing a couple of resistors.
> > > > I have a reason for running mine at 2.8 V stoich
> > > > instead of 3 V. The most accuracy is desired
> > > > around stoich, so my circuit is intended to be
> > > > dead on at that point. Calibration and other
> > > > errors come into effect as you move away from
> > > > stoich. To minimize errors, the stoich output V
> > > > is the same as my reference power supply, and
> > > > my reference power supply is 2.8 V. The reason
> > > > for that is to allow use of newer parts, eliminating
> > > > a couple dozen other parts.
> > >
> > > Simple is a GOOD thing.
> > >
> > > > My next item is a real time display, a readout.
> > > > I propose a bar graph with a center LED to
> > > > indicate operation at stoich. As operation
> > > > moves more rich, a column of green LEDs would
> > > > light forming a bar growing away from stoich.
> > > > For lean operation, a column of red LEDs would
> > > > grow in the opposite direction. The length of the
> > > > bar would show how far you are from stoich, and
> > > > the color indicates in which direction.
> > > > RRRRRRRRRRSGGGGGGGGGG
> > > > If we have a readout, how should it be calibrated,
> > > > and to what resolution? I would suggest 10
> > > > divisions in either direction might be good for a
> > > > dashboard gauge, but up to 20 each way might
> > > > be better for wide range tuning and operation.
> > >
> > > > What are meaningful divisions?
> > >
> > > This is where we kinda get to too much of a good thing. IMO, as long
as
> > > the
> > > results are repeatable, is the number one concern. If there is enough
> > > resolution to see that the changes are having the expected results
we're
> > > in.
> > > For me 10 is fine, but I can see where others would want the 20
> flickering
> > > lights.
> > >
> > > The A/F to
> > > > voltage curve is pretty badly curved, but is
> > > > that even what we want to display? Here is
> > > > how I see it. Imagine we have this box of air
> > > > and add a bit of fuel. We get a voltage reading
> > > > from our sensor when we burn the fuel. Every
> > > > time we add a larger amount of fuel (increase
> > > > injector pulse width), Ip and our Vout shift a
> > > > proportional amount. A nice linear function of
> > > > fuel increase to voltage. So why is the A/F
> > > > curve so UN straight? BECAUSE the function
> > > > described above IS NOT A/F, IT IS F/A. So I
> > > > propose a linear display of the voltage out is
> > > > really what we need, to relate tuning to output.
> > > > We can MARK it in A/F, but the markings will
> > > > not be linearly spaced.
> > >
> > > Mark a high end, and a low end reading and be done with it. The MAGIC
> is
> > > the tuning, not in the display. Let me rephrase that, knowing where
> you
> > > are, and beeing able to see that your going in the right direction is
> what
> > > we need. IMO, too often folks get lost in their tuning.
> > >
> > > > Allright, there is one more factor. That almost
> > > > perfectly linear delta fuel to delta voltage
> > > > relation, shifts as you pass stoich, to a slightly
> > > > different very linear relation. I propose that the
> > > > gain (number of divisions per volt) BE SLIGHTLY
> > > > DIFFERENT on the 2 sides of stoich. So now a
> > > > given increase in fuel will cause the SAME
> > > > number of divisions movement of the bar, from
> > > > one side of the display to the other. Circuit wise
> > > > this function is almost free.
> > > >
> > > > Something else we could add is a switch for
> > > > free air calibration. This would normally be
> > > > off scale, but it would reduce gain to put an
> > > > indication at 22:1.
> > > >
> > > > There is a warmup time approaching a minute
> > > > for the sensor. I suggest the display be blanked
> > > > (turned off) during warm up. Besides giving an
> > > > indication of operation, it allows the considerable
> > > > LED current to be "stolen" from the sensor
> > > > heater circuit, saving power, heat, and heat sinks.
> > > > The cost is one transistor.
> > >
> > > I'd agree with that, avoiding a too soon reading.
> > >
> > > > One more output that might be useful would
> > > > have a 1 volt output range, reading 0 to 1 volt as
> > > > we moved from 15:1 to 14:1 A/F. The idea is to
> > > > look like a conventional narrow band OX sensor.
> > >
> > > YES, YES, YES.
> > > Using the 0-1 will allow data logging with all the conventional
> > > scanners!!!.
> > > C/L can be blocked, and then just info logged to see where things are.
> > > THANKS
> > > Bruce
> > > >
> > > > All these outputs could exist at the same time, or
> > > > just put in parts for the ones you want. I await
> > > > your opinions on the subject. Bruce Roe
> > > >
> >
>
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