[Diy_efi] new EFI controller

[maier_markus at t-online.de]

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 :)
> 
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