rocwandrer
100 W
I can handle the electrical basics and mechanical systems of my projects, but I'm reaching out for help on how to get the control input signals for this project. I figure someone here is as "electrical" as I am "mechanical", and knows off the top of their head exactly how to achieve what I'm going for
What:
I'd like to be able to in some way compare the speed of one wheel to the speed of another, and get an output that I could use (directly or indirectly) to apply a throttle signal to a controller.
I have no clue how to make something like that happen. I don't need to know the speeds, or the difference between them. I basically want one output (nothing) when wheel A is at the same or less speed compared to wheel B, and I want an output when wheel A is turning faster.
Why:
Mostly because I think it would be a cool project, not for any necessity. This is more "thrill of the project and result" than it is "practical". There are two times I think this would be useful:
1.) When pedaling in snow, I could have FWD engage only momentarily at any time when the rear tire spins. This would waste less of my pedaling energy, prevent me from digging a hole and coming to a stop, and generally improve my mood when pedaling in marginal conditions. I'm hoping for a response time that would be better than mine (which would be about 1/2 second at best).
2.)My winter commuter bike runs around 3 psi in the tires. On a steep uphill, when I transition from spinning to mashing (and start hurting my knees), the rear tire becomes substantially smaller in effective radius because of the rearward load transfer. I could potentially have a completely automated engagement of assist on steep uphills, and with some instant on, delayed off (capacitor on the throttle signal or something?) magic, it could even be roughly proportionate to my knee strain.
What:
I'd like to be able to in some way compare the speed of one wheel to the speed of another, and get an output that I could use (directly or indirectly) to apply a throttle signal to a controller.
I have no clue how to make something like that happen. I don't need to know the speeds, or the difference between them. I basically want one output (nothing) when wheel A is at the same or less speed compared to wheel B, and I want an output when wheel A is turning faster.
Why:
Mostly because I think it would be a cool project, not for any necessity. This is more "thrill of the project and result" than it is "practical". There are two times I think this would be useful:
1.) When pedaling in snow, I could have FWD engage only momentarily at any time when the rear tire spins. This would waste less of my pedaling energy, prevent me from digging a hole and coming to a stop, and generally improve my mood when pedaling in marginal conditions. I'm hoping for a response time that would be better than mine (which would be about 1/2 second at best).
2.)My winter commuter bike runs around 3 psi in the tires. On a steep uphill, when I transition from spinning to mashing (and start hurting my knees), the rear tire becomes substantially smaller in effective radius because of the rearward load transfer. I could potentially have a completely automated engagement of assist on steep uphills, and with some instant on, delayed off (capacitor on the throttle signal or something?) magic, it could even be roughly proportionate to my knee strain.