I'm trying to control an electric vehicle, say scooter. Vehicle throttle meant to be controlled with potentiometer like on the picture. And it works just fine with 10K pot.
Now I want to control throttle electronically, thus I make some analog voltage with microcontroller and scale it appropriately to match HIREF - LOREF with op amp.
I check the THROTTLE voltage with oscilloscope and it is just fine, but motor controller doesn't seem to react. What can be the case? Isn't it voltage controlled? Can I emulate potentiometer with some circuit?