Hi, I am not an EE, but a motorsports enthusiast and hobbyist. Hope I can get some help here.
My project is to design and build a circuit to interrupt the spark ignition in a two-cycle IC engine, for a single (but adjustable in On and OFF portions relative to trigger event) pulse in the 20 to 500ms range. The purpose of this circuit is to enable a "Wide Open Throttle" gear shift (aka "flat shift"). The idea is to trigger the circuit with a microswitch that closes at the beginning of the mechanical gear linkage motion cycle, so that the ignition cuts out momentarily (slightly unloading the gear train) just as the gear-change mechanism is applying force to the gear change shafts. (In this application the clutch is not needed or used except for starts from a dead stop.)
The application uses a solid-state (capacitive discharge) ignition circuit, exciter coil, pulse coil, and ignition coil. My plan is to have my circuit close the "kill-switch" circuit, which is a normally-open circuit between the exciter coil and system ground. I believe this "kill-switch" circuit, when closed (and when the engine is running), shorts a 100-200VAC current (from the exciter coil) to ground.
I think that given these application variables I need the following design parameters:
Power for my circuit (9VDC would be best);
Ability for microswitch input to trigger shorting of VAC circuit (solid-state relay?);
Ability to adjust delay between microswitch closure and shorting pulse ON event from 0 to 500ms, regardless of whether trigger microswitch is closed or open;
Ability to adjust shorting pulse OFF event (duration of pulse) between 20ms and 500ms, regardless of whether trigger microswitch is closed or open;
Circuit must reset (go back to ready state) 200ms after pulse OFF, regardless of trigger microswitch still being closed;
Would be nice to debounce or isolate the circuit from microswitch noise.
I think a 555 timer and a SSR is the way to do it, as a monostable multivibrator (one-shot) where the output of the 555 switches the relay on and off. I found a circuit that uses two pots (cermet?) and two diodes (zener?) to make the ON and OFF output of the 555 adjustable.
Any ideas or thoughts? TIA