ION and EGOR

garfield at pilgrimhouse.com garfield at pilgrimhouse.com
Fri May 22 23:01:01 GMT 1998


On Fri, 22 May 1998 19:49:09 +1200, Mike Morrin <mikem at southern.co.nz>
wrote:

>>she may not be able
>>to open her eyes in time to SEE the bad things she's supposed to report,
>>cuz the inductive spark duration is soooo long.
>
>Why not clamp a suitable resistor across the primary of the coil a 100us
>(or whatever) after the firing point, to quench the spark, and allow the
>ION to open its eyes at a controlled time?
>
>In other words, shorten (under processor control) the inductive spark
>duration to be long enough to light that fickle mixture, but not as long as
>it would with the unloaded coil ringing.
>
>Food for thought?

Yup, tiz an idea, and possibly never done cuz never was needed. It may
indeed be possible to terminate the inductive duration and see NO bad
effects at all. Good suggestion. And obviously, although the duration is
long, still the bulk of the spark energy being pumped into the
gas/plasma has GOT to be in the early part of the spark, and
rapidly/exponentially-at-least diminishing as time goes forward.

What I or someone else oughta do is get on the scope with a calibrated
HV probe, and see just how long the duration is out to say 1000-2000V,
where the spark could probably be nipped without untoward effects on
combustion at all. Then if we use 400V for the measurement potential, we
have a decent noise margin between the spark's last gasp, and the
continued effect of the ionized plasma forced at the measurement
voltage.

Somethin to munch on, indeed.

Gar




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