hi
I’m an electronics technician but don’t have hardly any experience with designing a position control system.
MY hobby is the small 2 stroke engines made for bicycles and they are drastically down on power.
I want to control the exhaust pipes outlet size according to the engine rpm.
I know how to use inductive pickup from the spark plug wire and run it to a frequency to voltage converter so that as rpm increases then the voltage increases. I want to use that voltage to control a 90 degree arm movement of a servo motor. I’d like to keep things simple and not costly so others can also do the same without too much expense or headache.
I have no idea about the controllers or how much torque I need at the servo arm. I doubt much torque is needed because the impulses of exhaust gas pressure will not affect movement of the cutout cylinder that can vary the flow outlet size.
Any suggestions are very welcome as to what controller and motor to use.
So if I understand correctly:
Spark plug -> frequency to voltage converter -> microcontroller -> Servo motor
Do you have any size constraints for the servo? Should it be waterproof (rain)? As for the type of microcontroller, any ideas as to which programming language? Price? Size?
Not sure what specs are needed to go from the spark plug to the microcontroller, so perhaps you can do some research. We offer a wide range of microcontrollers of various sizes, so it’s really up to you which one you want to go with (the choice of sensor may have an impact). You should be able to hook the servo directly to the microcontroller (though you may need to provide power separately).
the sequence you list is correct.
the smaller, the better.
I can waterproof it.
simplicity, low cost, small size
thanks!