Injector Driver Module

[Shannen Durphey]

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.