Just wondering, it seems you and your friend are
more
than enough proficient with the electronics to
create
this system; but as I understand it, the major
makers
such as Bosch do tons of research to get the mapping
correct. Is your system for racing or off road use
only; so that it doesn't need to be concerned as
much
with all the variables of a road car, such as cold
start, warm-up, idle control for
accesories(a/c,alt),
progression or fuel enrichment on acceleration, and
emissions? I know that even on older mechanical
pumps
they had built in the proper fuel ratio for evey
con-
ceivable combination of load and engine speed. It's
a very interesting project and I wish you well, I
was just interested in if and how you were able to
accomplish the complex mapping of a road car. I was
involved once with a Lamborghini that someone had
taken the Webers off of and fitted with an aftermarket
fuel inj. unit (don't remember the name)that
had to be programmed on the car with a laptop, and
they never got it quite right. Again, just
wondering.
- Quentin Todd <greenbarron@yahoo.com> wrote:
> Megasquirt has some significant "geeky" problems, if
> you want the list of main flaws as I see it, just
> ask.
>
> 1 - YOU BUILD IT, as it is an application that could
> kill people for them to sell you a complete ECU they
> need to sign off on it as professional engineers.
> They have not even remotely done enough safe
> engineering to do that. This is why the two guys
> who
> are building it, who are PEs, will not sign off on
> it.
> We hope to have it signed off on by a PE.
>
> 2 - The O2 sensors can start reading lean, i dunno
> how
> in the world they allowed this to happen it was an
> easy circuity fix, but when it does the ECU just
> floods your engine with fuel, the fix is to turn the
> car off then on to reset the ECU.
>
> 3 - Wide band is way overly complex, and the uC/DSP
> hybrid they use costs too much, and is really way
> too
> much for the job. A low pin-out, highspeed stand
> alone 8-bit uC is more than capable of handling the
> job.
>
> 4 - Their power supply cosists of 1 LM7805 linear
> regulator...ok, can we say stone age?? This thing
> can't possibly not brown out durning cranking, there
> are regulators developed just for this automotive
> purpose, they are much more advanced, and cost $1,
> which is a whopping $0.70 over the cost of the 7805,
> and guess what, you don't need a second battery to
> run
> the board while you start your car...
>
> Now with that being said, yea its a good system for
> the spare time that the guys spent. But their
> unwillingness to sign off on it as PEs shows some
> problems. We atleast want to make a system that a
> good PE would sign off on. As it stands they don't
> have a fuel cutoff circuit either...in the even of a
> crash I want that handled automatically, and
> quickly.
>
>
> --- Marcus Schaper <schaper@wam.umd.edu> wrote:
>
> > Quentin,
> >
> > check out Megasquirt - it is a DIY system that
> > already does what you are
> > trying to achieve. Plus, they are working on
> > incoparing igntion.
> >
> > They use a wide-band O2 sensor - and if understand
> > it correctly, the code
> > for the system is available and can be tweaked. By
> > now, there are many MS
> > equipped cars and experience around. You may be
> able
> > to simply use their
> > wide-band O2 sensor board.
> >
> > Just do a web-search for megasquirt. They also
> have
> > a discussion list.
> >
> > Marcus
> >
> > > From: Quentin Todd <greenbarron@yahoo.com>
> > > Subject: RE: EFI
> > >
> > >
> > > Need a suggestion:
> > >
> > > I am starting on the design of a wide-band O2
> > sensor
> > > implimentation for the EFI system he built (i
> now
> > have
> > > all the code, and the engineering schmatics :-)
> >
> >
> > -----
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> > Yahoo! Groups Links
> >
> >
> > classicopels-unsubscribe@yahoogroups.com
> >
> >
> >
> >
> >
>
>
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Received on Wed Jul 13 23:43:45 2005
