[Diy_efi] Microcontroller based Auto Related Projects

Wed Oct 31 14:38:40 UTC 2012

Nice looking device, I drew out a simple 4 cyl efi controller based on one of the
smaller silabs/cygnal chips since I have a dozen or so of their development systems,
most h/w functions were fudged with simple software, never got around to make it
running though. Now that the car has twin down draught webers (Ford escort 1972),
if we have time my eldest and I will have EFI at the same time... maybe...
mike

At 08:41 PM 31/10/2012, you wrote:
>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" <<mailto:anisbet at gmail.com>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 <<mailto:xyzqhtc at gmail.com>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 <http://hackaday.com>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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