Ignition cuts for rev limits / traction control

[Axel Rietschin]

Why don't you cut the fuel pulses?

--Axel

----- Original Message -----
From: "Murphy, Ian" <Ian.Murphy at Arrows.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, June 22, 2000 11:08 AM
Subject: Ignition cuts for rev limits / traction control


>
> Does anyone have any cunning ideas for implementing ignition cut
strategies
> for rev limits and traction control purposes?
>
> I'm struggling with the following concern: You detect an over-rev (or
> wheelspin) event and want to cut spark ASAP, but the coil driver(s) are
> already charging the coil(s) for the next combustion event (or 2, or 3,
> depending on your system). Do you wait until the next available 'slot'
when
> you can avoid charging a coil up (and therefore possibly risk over-reving
> further) or can you 'bleed down' the charging coils somehow without
causing
> a spark to fire?
>
> The only other solution that springs to mind is retarding the already
> charging coils to limit torque output while waiting for the cut to be
> available.
>
> Another thing that bothers me is engine stalling: If you stall an engine,
> and have a charging coil, what do you do with the spark? If you just fire
it
> off after the maximum safe dwell for your coil, the engine could be in any
> position and you could blow up your inlet manifold, or push the engine
> backwards...
>
> Any thoughts?
>
> Ian
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