Injector Driver Module

[mrvette]

your rite,,,,I screwed it up myself.....oh well.....GENE

Shannen Durphey wrote:
> 
> Which pulses were we discussing?  6000 RPM=100 cps, but
> takes 2 crank revs to fire 8 cylinders.  So, each plug wire
> fires 50times/sec, and coil or coil wire is 400 (50*8)
> times/second.  Also, during synchronous firing, one primary
> side coil pulse=one injector pulse.  With 8 injectors tied
> together, is 400hz.  Split into two banks of four, is 200hz
> each.  Sequential is 50hz each.
> 
> mrvette wrote:
> >
> > Say what?  at 6000 rpm.....ign. pulses are 100 hz....and so are injector pulses
> > in sequential......if batch it's dviided by 4     not the pulse width, but the
> > rate.....GENE
> >
> > Don.F.Broadus at ucm.com wrote:
> > >
> > > I'm working on an  injector driving module also. If you are going to fire
> > > the injectors sequentially, then one injector would be on at a time in the
> > > firing order sequence (1-8-4-3-6-5-7-2 GM V-8)  If you are going to batch
> > > fire the injectors
> > > Then only 4 would be on at a time.  The factory heat sinks on the driver
> > > transistors are not that big so I doubt that the power dissipated is very
> > > high.  The duty cycle is a combination of on time and off time, so even at
> > > 85% the injector would
> > > Only be on for less than half of the time. The frequency of the injector
> > > pulse needs to be known, at 6000 rpm the ignition
> > >  pulses are 400 HZ. I would guess that the injector pulses would be the same
> > > frequency for sequential firing and half of that for batch firing.  So far
> > > my bench setup is a batch fire with  2msec on time at idle  and 10 msec at
> > > wot. Any advice would be appreciated.

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