Hello:
May I ask: concerning the solenoid in a fuel injection unit, where the solenoid lifts a ferrite piston, allowing the ultra-high pressure fuel to inject, what happens when the current is cut?
In my circuit, about 16 amps at 20 v DC briefly (about 2 ms) activate the coil. The current comes from a Current Generator.
On switch-off, (I presume) there should be an induced spike pushing "current" from the "bottom" of the coil in the same direction to earth. We have a big diode permitting this current to return to the top of the coil.
I'm wondering how this might delay the valve closing. Given that the coil still goes to earth, maybe it