[Diy_efi] new EFI controller

[Bevan Weiss]

The TriCore chips are very nice looking however are a little limited in some
areas:
They only have 24 analog inputs (nice 8/10/12bit resolution though)
They have no onchip FLASH (this means that extra FLASH chips would be
required, and I hate routing 32bit bus' on 4 layer boards :)
The DSP functionality is cool, but hopefully it won't really be needed.
Some basic curve fitting is all that's required, and it looks like (from
Ville's Paper) all that's really required is two slope matching processes
for each cyclinder event :)

Nice idea though,
They do look suited for a simple Automotive Controller.

Thanks,
Bevan Weiss

----- Original Message -----
From: <maier_markus at t-online.de>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Tuesday, March 11, 2003 12:33 AM
Subject: Re: [Diy_efi] new EFI controller


> Hi,
>
> ever thought about Infineons TriCore? It has a DSP core also onboard,
> which eases the life of ION sensing and other stuff.
>
> Ciao
> Markus
>
>
> Bevan Weiss schrieb:
> > OK, there was talk about this a while ago but things kind
> > of fizzled with
> > Gars departure.  I've been thinking about a new
> > controller in the same kind
> > of style as EFI332.  Using the MPC565 from Motorola, or
> > the MPC566 for those
> > that just want to be different.  It's got the vast
> > majority of required
> > features already onchip.  And it has the processing power
> > to achieve some of
> > those dream objectives like ION sense.
> >
> > Some of the ideas that I've been considering are:
> > analog->digital sample rate:
> > The MPC565 has two QADC (Queued Analog Digital
> > Converters) each can run up
> > to 200KSPS.  I'm thinking that if one is dedicated to ION
> > sense, ie round
> > robin 4/6/8/12 cylinders, and the remaining channel does
> > a similar round
> > robin of the remaining sensors ie MAP/MAF, TPS etc...
> > What kind of rate of change do you think these signals
> > undergo?
> > Is the round robin 200KSPS enough?
> >
> > Ignition:
> > I really don't like the idea of inductive ignition
> > systems, pumping current
> > through an inductor just to store some energy in the
> > magnetic field seems a
> > little harsh.  I prefer CDI systems, although I think
> > that perhaps some kind
> > of multispark arrangement would be preferred.  Have it
> > such that the 565
> > sends out an ignition pulse, the rising edge causes the
> > CDI system to
> > discharge the capacitor by a certain level (however much
> > would give ~50mJ
> > spark), the discharge is stopped (by the CDI circuitry)
> > and the capacitor
> > charges some more, then reaches a preset voltage and
> > discharges again.  Kind
> > of like oscillating between two preset voltage levels.
> > This continues until
> > the 565 lowers the ignition output, then the capacitor is
> > just charged back
> > up ready for the next ignition event.
> >
> > Injection:
> > Nothing fancy that I can think of.  I'd really like to
> > keep this part simple
> > as, I don't really want anything like a DC-DC converter,
> > I'd prefer to
> > obtain any high voltage from the actual field collapse,
> > and then use this
> > energy to jump start the field back up again with the
> > next injection pulse.
> >
> > ION sense:
> > this will pretty much just be a current sense resistor
> > with some
> > programmable gain differential amplifier which then feeds
> > the QADC of the
> > 565.  Certain algorithms could be run on a particular
> > sample (ie one
> > ignition cycle) to look for such things as peak pressure
> > not occuring at
> > optimum crank angle, and knock/pre-detonation.
> >
> > WBO2:
> > This would use a concept similar to the DDL scheme...
> >
> > MAP/MAF:
> > Is there any advantage to having both?
> > Apart from redundancy (if one fails...)
> >
> > Other ideas/comments appreciated :)
> >
> > _______________________________________________
> > Diy_efi mailing list
> > Diy_efi at diy-efi.org
> > http://www.diy-efi.org/mailman/listinfo/diy_efi
> >
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi
>

_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi