[Diy_efi] Microcontroller based Auto Related Projects
Bill Shaw
b.shaw
Wed Oct 31 12:41:14 UTC 2012
The operating voltage is not a significant decision factor when choosing
an automotive microprocessor. The MPC5554 we are using has a 1.3 volt
core and 3.3 volt I/O. It is an awesome automotive microprocessor,
but the array of peripherals and registers would be a bit daunting for
the uninitiated.
Best,
Bill
On 10/31/2012 12:16 AM, Alan To wrote:
> 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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