I lost the thread so not sure what type of injector/motor etc

But playing along I calculate

So assuming 4 stroke At 5000rpm -> 2500 complete injections/min or 42
complete injections / sec.  (Complete injections -> I understand modern
injectors are required to perform several injections of varying duration
for each cycle)

Time between openings 24ms.  Open time of 1ms is approx 4% of a complete
cycle.

Does that look ball park?

Justin


On 16 December 2015 at 16:16, Mike Rigby-Jones <pic.developer@gmail.com>
wrote:

> Neil probably thinks this is odd since the typical opening time of a mode=
rn
> high impedance injector is more like 1ms or less, and low impedance
> (peak/.hold) injectors are even faster.  However the fast opening time of
> low impedance injectors relies on a short period of high current (maybe 4
> amps or so) followed by a lower holding current which is not being provid=
ed
> here, and the series resistor increases the time constant, slowing down t=
he
> initial ramp.
>
> Mike
>
> On 16 December 2015 at 00:42, Dwayne Reid <dwayner@planet.eon.net> wrote:
>
> > Hi there, Neil.
> >
> > I don't find that behavior odd at all.  The injector armature has
> > some mass, which takes time to get moving.
> >
> > dwayne
> >
> >
> > At 10:55 AM 12/15/2015, Neil wrote:
> > >On a side note, I tried using a peak-and-hold injector as a regular
> > >high-impedance injector, with a 5.5-ohm series resistor to limit the m=
ax
> > >current, similar to what some automotive ECU's do.  This behaviour was
> > >interesting.  Note that the max current is developed in 2 ms, but then
> > >the injector does not begin to open until at least another couple ms
> > >later.  I just find this odd.  The current here is measured across a
> > >0.05-ohm sense resistor between the MOSFET source and ground.
> > >http://tinyurl.com/za44qlz
> >
> >
> > --
> > Dwayne Reid   <dwayner@planet.eon.net>
> > Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> > (780) 489-3199 voice          (780) 487-6397 fax
> > www.trinity-electronics.com
> > Custom Electronics Design and Manufacturing
> >
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
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