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PICList Thread
'[EE]: Automotive engine controller'
2006\04\30@131255 by Denny Esterline

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I've been asked to provide some guidance / mentoring for the local university's formula SAE race team's electrical group. (~450 Lb car with a 600cc fuel injected 4-cyl motorcycle engine) There's some fairly arbitrary rules in the event that significantly favor teams that build the engine controller from scratch, so it's being considered. Obviously this is a off-road experimental application so the "normal" regulations don't apply.

I was hoping to tap into the list's collective experience for any good reference material, first hand experiences, perils and pitfalls to avoid - that sort of thing.

The one they're using this year seems to be implemented with a couple of lookup tables (rpm and throttle position => fuel injector PWM, rpm and throttle => spark timing with a temperature correction) A couple of quick calculations suggest that that could be implemented on a decent sized PIC. But obviously there are some details missing in that arrangement. (exhaust O2, intake air temp, manifold pressure, etc)

I await your guidance, oh great list :-)

-Denny



'[EE]: Automotive engine controller'
2006\05\01@114039 by Denny Esterline
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This is why I _love_ this list!!!

I can ask a question about any obtuse, arcane and esoteric subject and get at least a couple really useful responses. I had previously spent about three hours with google and hadn't come up with anything particularly useful, but one post to the list and...

Thanks
-Denny



{Quote hidden}

2006\05\01@162555 by Sean Schouten

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> > Google for "Megasquirt" and "Megaspark" - the websites and forums
> associated
> > with the above will give you everything you need to know to build/design
> > your own unit (even if its just a kick in the right direction ;-) )
> >
> > Dom
>

Do I mis-out on some replies, or was this one of the off-list type?


Sean.

2006\05\01@163749 by Alex Harford

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I second the vote for MegaSquirt/Spark.  Just make sure that it can
handle the RPM range that a formula engine operates in.  I assume that
it revs higher than most commuter cars. :)

Not sure how familiar you are with fuel injection, I would recommend
they start reading the archives at http://www.diy-efi.org for some tips,
especially relating to wideband vs narrowband O2 sensors.

2006\05\01@164140 by Dominic Stratten

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----- Original Message -----
From: "Sean Schouten" <spam_OUTdev.seantechTakeThisOuTspamgmail.com>
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam@spam@mit.edu>
Sent: Monday, May 01, 2006 9:25 PM
Subject: Re: [EE]: Automotive engine controller


{Quote hidden}

> --

2006\05\01@175210 by PicDude

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Been a bit out of touch with the Megasquirt project, but IIRC there is control
of fuel and spark now, and someone was porting it to an AVR.  Perhaps you
might port to a PIC...?  Also, don't know the full details of your
application, but you might look at setting it up as CFI.

Cheers,
-Neil.



On Monday 01 May 2006 15:37, Alex Harford wrote:
> I second the vote for MegaSquirt/Spark.  Just make sure that it can
> handle the RPM range that a formula engine operates in.  I assume that
> it revs higher than most commuter cars. :)
>
> Not sure how familiar you are with fuel injection, I would recommend
> they start reading the archives at http://www.diy-efi.org for some tips,
> especially relating to wideband vs narrowband O2 sensors.

2006\05\01@201139 by Denny Esterline

picon face
> Been a bit out of touch with the Megasquirt project, but IIRC there is control
> of fuel and spark now, and someone was porting it to an AVR.  Perhaps you
> might port to a PIC...?  Also, don't know the full details of your
> application, but you might look at setting it up as CFI.
>
> Cheers,
> -Neil.

Having the right "secret word of the day" to give to google has turned up several interesting sites. Yes, Megasquirt does have control over fuel and spark now, and there are some links to an AVR version, though I haven't studied it extensively yet.

But why would I want to set it up as CFI? (I assume you mean Central Fuel Injection, a variation on throttle body injection) It already has multiport injection.

-Denny

2006\05\02@054137 by Michael Rigby-Jones

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>-----Original Message-----
>From: piclist-bouncesspamKILLspammit.edu [.....piclist-bouncesKILLspamspam.....mit.edu]
>Sent: 01 May 2006 23:52
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE]: Automotive engine controller
>
>
>Been a bit out of touch with the Megasquirt project, but IIRC
>there is control
>of fuel and spark now, and someone was porting it to an AVR.  
>Perhaps you
>might port to a PIC...?  Also, don't know the full details of your
>application, but you might look at setting it up as CFI.
>


The stand alone spark control system are actually called MegaJolt & Megajolt Light though neither has reached fruition AFAIK.  There is a much simplified offshoot called "Megajolt Lite Jnr", which uses the distributorless Ford EDIS ignition system (which does the majority of the work) and a small Motorla 8 bit controller to hold the advance tables etc.

Megasquirt can now control spark, either distributorless through an EDIS module or with/without a distributor using one/both of the on-board coil drivers (V3 PCB only).

The AVR version seems to have distanced itself from the original Megasquirt, to the point of dropping the Megasquirt name and having a separate website: http://www.vems-group.org/

Regards

Mike

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2006\05\02@082324 by Alan B. Pearce

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>I didnt see my own reply but obviously some people got it.
>
>I might have to play with my list settings to see if I
>can turn my own echo on.

I didn't see your reply either - maybe it didn't make it to the UK ... ;)

2006\05\03@133845 by Martin Klingensmith

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Our team is/was working on a custom ECU for FSAE.
It's a big step going from using the stock ECU to hooking up your own
and getting it to work. You/they will need IGBT circuits for the
ignition coils, MOSFETs for the injectors, and a lot of patience.
I wasn't directly involved in it but I know it is quite a project for an
undergrad team.
Our team didn't have buckets of money to throw at the problem either so
it seems to me a futile attempt.
--
Martin K

Denny Esterline wrote:

{Quote hidden}

2006\05\04@045401 by Justin Richards

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I see that Sean is mailing from Gmail.  just check to make sure that
it has not been filtered as spam.  Some of my piclist stuff ends up in
spam.

justin

On 5/2/06, Sean Schouten <EraseMEdev.seantechspam_OUTspamTakeThisOuTgmail.com> wrote:
{Quote hidden}

> -

2006\05\04@121938 by PicDude

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On Monday 01 May 2006 19:11, Denny Esterline wrote:
> But why would I want to set it up as CFI? (I assume you mean Central Fuel
> Injection, a variation on throttle body injection) It already has multiport
> injection.

If it's already setup for multiport then that's the way to go.  If you're
converting a carbed setup, CFI is ultra-simple.

Cheers,
-Neil.

2006\05\04@124010 by Alex Harford

face picon face
I've seen that too, but not in this case.  Dom's message didn't show
up anywhere for me.  Maybe he sent it privately by accident?

On 5/4/06, Justin Richards <justin.richardsspamspam_OUTgmail.com> wrote:
{Quote hidden}

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