[Diy_efi] new EFI controller

[Greg Hermann]

At 9:44 PM 3/9/03, Toyota Supra wrote:
>the ability to controll additional injectors, based on a 3d map of boost,
>rpm and tps
>
>10 general purpose outputs, with completely customizable 3d fields, based on
>boost, rpm and tps
>
>if it has those 2 things, with programming software, i would buy it

Don't forget the ability to control H2O injectors--- :-)

Greg
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>>From: "Bevan Weiss" <kaizen__ at hotmail.com>
>>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>>To: <diy_efi at diy-efi.org>
>>Subject: [Diy_efi] new EFI controller
>>Date: Mon, 10 Mar 2003 13:57:20 +1300
>>
>>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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