[Diy_efi] EMS inputs/output?

[huw scourfield]

Bruce, you're not grasping the problem here, the idea of a degree project is
to demonstrate an ability to analyse the extent of a "problem",  dream up a
solution and prove why it can or cannot be done.
In Efi terms there is little to prove as far as what can be done by custom
efi chips, but selecting a given chip, preferably a new, multi-purpose
microcontroller which might be able to do the basics as a single component
shows that problem solving, project management,report writing skills are
possesed.
The average engine will run quite happily on open loop, 16 load/speed sites
and litttle more in terms of compensation than coolant temp and tip in
enrichment.This means you don't need to know all about the latest
trends/developements/capabilities available.
So for my money, by all means learn as much as possible, but time since is
limited, go for a basic speed only ign system, this is by far the most
difficult bit, fuelling is realy simple to do in comparison and can be left
untill last - (for all the fuss about megasquirt, it only pours fuel into
the inlet manifold dependant on engine requirements). Even interpolation can
be left until last, not ideal, but the engine will run without it.
    Huw

----- Original Message -----
From: "Bruce" <nacelp at bright.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, July 26, 1995 2:02 PM
Subject: Re: [Diy_efi] EMS inputs/output?


>
> I did!.
> Who else better to learn from then someone that's spent millions getting
> things right.   It's better then having you own teaching staff at you
> disposal.   Building an ecm bench and seeing how the pros do it, is an
> important step, IMO.
>    Yes, building an ecm is a grand thing, and you can bare bones it, and
> have a decent system.  By why not learn as much as possible, before hand?.
>    If you want the basics, well just string a few 555s together, and an
> injector driver.
>    For someone starting off without knowing what would seemingly be basic
> guestions, then looking at and understanding what an oem does, is a
mavelous
> start, and depending on that guage where and how far you want to go.  But,
> to say I want to do an ecm from scratch in a year, is a huge job, assuming
> you're doing college level work vs stringing some 555s together.
>    These guys that write code at GM, are really good, and have made
careers
> out of engine management systems.
> Bruce
>
>
> ----- Original Message -----
> From: "Richard M" <richm at ntlworld.com>
> To: <diy_efi at diy-efi.org>
> Sent: Thursday, July 25, 2002 9:19 AM
> Subject: Re: [Diy_efi] EMS inputs/output?
>
>
> > Bruce,
> > You are always banging on about 'DIY' and the importance of doing things
> for
> > ourselves etc.... so give the guy some encouragement.. I did my own ECM
> some
> > years ago, and compared to a 'oem' it was much simpler and usefully so
> IMO.
> > The oem's have to include loads of stuff that is not used to directly
> > control the particular engine it is fitted to, they have to cover a
> > multitude of issues relating to emmissions, diagnostics and
manufacturing
> > spread, which are not so important in a system intended for a much
> narrower
> > useage.
> > So Alex, just go ahead and give it a go, and good luck - you will learn
a
> > lot that way..
> > Regards
> > Rich
>
>
>
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