[Diy_efi] Microcontroller based Auto Related Projects

Fri Nov 2 00:04:28 UTC 2012

Good. Keep bits and pieces coming. That's all I need. Thx.
On Nov 2, 2012 11:31 AM, "Fred Cooke" <fred.cooke at gmail.com> wrote:

> Something simple to get started on, that Delco reminded me of, is
> Jason Roughley's PIS software, check it out here:
>
> https://github.com/Torture/PIS
>
> It's very basic and PW driven, but PW is his thing, he's not a VE fan :-)
>
> Regards,
>
> Fred.
>
> On Thu, Nov 1, 2012 at 11:47 PM, Bill Shaw <b.shaw at comcast.net> wrote:
> > Yes,  there's lots of info out there.  You will find more interesting
> > reading at http://www.sae.org/.
> >
> > Slight subject change - I brought home a new(er) dd yesterday,  a 2010
> > Camaro SS.  Sweet ride,  bad news is it's got a Bosch ecu!
> >
> > Thanks for the e-book link.
> >
> > Bill
> >
> >
> > On 11/1/2012 6:03 PM, xyz Q wrote:
> >
> > Driving a vehicle that would have your own designed and built ecu could
> feel
> > like a 'mystical' experience, some what.
> >
> > We still run right, considering it was a major source of transportation a
> > 100+ years ago now its mostly for recreational.
> >
> > I just think there's so little info pertaining to ecu controls even basic
> > ones that probably its worth looking into.
> >
> > On Nov 2, 2012 8:40 AM, "David Allen" <davida1 at hiwaay.net> wrote:
> >>
> >> I always like microcontroller projects, have built some interesting
> >> things, too. I was considering trying to build an ECU, but then I
> realized
> >> something.  For me; with my project goals, GM had already engineered the
> >> perfect ECU. It's so good that millions of them are out there on the
> road
> >> today. Every parameter is configurable and the hardware is bulletproof.
> So I
> >> went with a Delco 1227730 ECU, and focused my microcontroller projects
> on
> >> other areas.  I made projects for where there aren't off-the-shelf,
> highly
> >> cost-effective solutions already available.  I've built auto headlights
> >> controller, air-levelling suspension controllers, parts-washer
> controller,
> >> heat pump controller, speedometer calibration modules, and other odds
> and
> >> ends. But the Delco ECU is just too cheap, available, rugged, and just
> plain
> >> good at what it does to re-invent the wheel for an engine ECU. The
> learning
> >> curve was a little steep learning the tuning, because there is SO MUCH
> in
> >> the ECM program. But it was worth it in the end, because it's so
> >> configurable.
> >>
> >> This is just my OPINION and I hope you guys take it as that. Not meaning
> >> to discourage anyone. I wanted to tell about the end result of when I
> went
> >> down the same path and the final decision I came to.
> >>
> >> Respectfully,
> >> David
> >>
> >> ----- Original Message -----
> >> From: xyz Q
> >> To: diy_efi at diy-efi.org
> >> Sent: Thursday, November 01, 2012 3:26 PM
> >> Subject: Re: [Diy_efi] Microcontroller based Auto Related Projects
> >>
> >> All this is ok. But I'm thinking in order to get started, wouldn't be be
> >> good if some experts could hold some basic ruts on this forum. Let's see
> >> what some have to say, mainly very specific info eg., rpm counting, etc,
> >> etc... But I know time would be a big issue for many.
> >>
> >> I downloaded some notes from Freescale on 68HC08 to introduce me to
> >> Motorola MCUs. My only experience is with 80x86 MPU from back in tech
> >> school.
> >>
> >> Anyways, here's an offtopic link that some might find useful. It's got
> >> premium ebooks on just about every subject for free.
> >>
> >> www.freebookspot.es
> >>
> >> On Nov 1, 2012 1:06 PM, "Alan To" <toalan at 14point7.com> wrote:
> >>>
> >>> For me 5v operation is a must have so to be able to work with the
> widest
> >>> range of sensors possible without additional burden of resistor
> dividers.
> >>> The MPC555x is a $30 uC, you are doing some high end stuff, for high
> end
> >>> stuff priorities are different, if you need to work with 5v sensors
> the cost
> >>> of 0.1% or better tolerance resistors or an external ADC is probably
> not an
> >>> issue. Originally we were talking about uCs in the same league as the
> 8 bit
> >>> PICs, AVRs, and perhaps as high as ARM Cortex M3/M4.
> >>>
> >>> Regards
> >>>
> >>> Alan To
> >>>
> >>>
> >>> On 10/31/2012 5:41 AM, Bill Shaw 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" <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> 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, 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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