[Diy_efi] Microcontroller based Auto Related Projects

Alan To toalan
Wed Oct 31 04:16:21 UTC 2012


It is a 3.3v chip and you really want 5v operation for automotive. The 
new Arduino Due will be a trainwreck, an epic one.

On 10/30/2012 6:47 PM, xyz Q wrote:
>
> There's an ARM based Arduino. What would you say about that for a choice?
>
> On Oct 31, 2012 1:22 PM, "Avery Nisbet" <anisbet at gmail.com 
> <mailto:anisbet at gmail.com>> wrote:
>
>     1.  Most of the hack a day projects are by IT/computer sci guys that
>     look down on getting their hands dirty with cars. If you look deeply
>     at some of the projects they will have really shoty electrical
>     engineering in them. Some of them are pure hacks and would not work in
>     a production sense.  Some are pretty decent.
>
>     2. Pics from an architecture point of view kinda suck. They were not
>     designed for use with stack based compilers(One working register).
>     The Motorola stuff was some of the 1st used in the automotive space.
>     The architecture lends itself to use with a compiler.  They are
>     designed for the harsher automotive environment.  Some will say they
>     have nicer hardware peripherals.  I would say some of the peripherals
>     were designed specifically for the automotive market. There is also a
>     pretty big code base to look at.  Oh and mostly anyone who went to
>     school for software or hardware who is older than say 30 was forced to
>     learn 6800(68HC11) or 68000 assembly language.  This usually involved
>     getting ahold of the purple data books motorola gave away for free
>     that were well enough written so you could get your class work or real
>     work done. I probably have 2 or 3 copies of the 68HC11 books laying
>     around somewhere. This being said there are many other options today
>     and I would look to ARM or AVR before I looked at PIC.  ARM is already
>     dominating the cheap 32bit market and is pretty easy to pick up. This
>     will help in the job search later. AVR's are pretty good for the 8bit
>     scene.  GCC supports them and ATMEL makes some automotive environment
>     parts.
>
>     3.  Go get yourself an Arduino(or other uC of choice), BIP373(OR GM
>     ignition module) and some optoisolators.  Then build a distributor
>     and/or crank trigger based ignition system. Then try turning that into
>     a full engine management solution using the peak and hold add in board
>     by Jbperf. Start researching the mega squirt schematics at the timing
>     input(tach) and the ignition output. Build those circuite on a bread
>     board and test on a bench. Then move them on to your test engine. It
>     could be a lawn mower engine or a V8 monster. Read up on timing
>     advance and program the Arduino to do a simple RPM only based timing
>     curve.  Then add a MAP and/or TPS sensors and add load as a factor of
>     your timing curve.  Then engine temp to add some cold start advantages
>     and you have all the sensors needed to do open loop EFI.  After adding
>     injectors you could add a wide band O2 sensor such as the LC-1 from
>     innovative motor sports or just a heated narrow band for cruze.
>
>
>     -Avery
>
>
>     On Mon, Oct 29, 2012 at 8:13 PM, xyz Q <xyzqhtc at gmail.com
>     <mailto:xyzqhtc at gmail.com>> wrote:
>     > Hi, I've been on the list for some time, on and off mainly
>     reading bits,
>     > trying to find some interesting ideas. Unfortunately I was 10
>     years too
>     > late, when this forum had been in its prime.
>     >
>     > So here are my first set of questions that I hope on getting
>     some answers,
>     > hopefully.
>     >
>     > 1. Why are there so little auto related uc based projects and
>     ideas out
>     > there on the net? Look at hackaday.com <http://hackaday.com>,
>     for example. Many projects, talented
>     > people but all they do is prove a point that some thing can be
>     done. But
>     > guess what hardly something is really useful. I may have missed
>     some good
>     > worth while so please put them here if you know.
>     >
>     > 2. If PICs are so popular, why are Motorola MCUs popular with
>     auto projects?
>     > In terms of features aren't they on the same "level"?
>     >
>     > 3. The way I see to learn microcontroller based EMS or ignition
>     is to look
>     > at it piece by piece. Megasquirt is great but it's hard to learn
>     a complete
>     > system. Aren't there any web sites (I've seen DIYEFI) that have
>     info on say
>     > ignition control, RPM handling with an MCU or other basic
>     control concepts
>     > that can form the basis for EMS/Ign. related projects. I'd like
>     to learn the
>     > basics and if there are specific approaches to this, I'd like to
>     hear your
>     > side of the story. It would be helpful.
>     >
>     > Thanks and regards to all on the forum. Some projects here are
>     really nice
>     > and inspiring.
>     >
>     > Nik.
>     >
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