PWM injector driver

[Greg Hermann]

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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