PWM injector driver

[Bruce Plecan]

----- Original Message -----
From: "Greg Hermann" <bearbvd at cmn.net>
To: <diy_efi at diy-efi.org>
Sent: Saturday, April 07, 2001 10:54 PM
Subject: Re: PWM injector driver


> At 9:42 PM 4/7/01, Bruce Plecan wrote:
> >What I did some time ago was
> >
> >Let the ecm supply the over all pulse width.
> >
> >I used that to trigger two power mosfets,  one had 8 ohms in series with
the
> >injector, and then a 555 astable mode with no resistor.    After the
astable
> >timed out then all that was left was the one with the 8 ohm series
resistor,
> >and the the open signal of the ecm tuned off the mosfet.
>
> Didn't try it with a switching power supply feeding a lower voltage to the
> mosfet that stayed on instead of a resistor, eh??
>
> Also pondering on a diode in series with the injector, then apply reverse
> voltage when time to close, just to collapse the field/stop the current,
> not to do an actual reverse current.
>
> Thoughts???
>
> Greg
>
>
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