zachleedogg
1 mW
- Joined
- Apr 4, 2021
- Messages
- 11
Hey there gang.
I'm working on building a pedal assist bike for my wife (and for myself!). The basic requirement is that I want a minimal build with minimal controls. No throttle, only pedal assist (with torque sensor).
What I have come up with is the following:
So the issue I am running into is how to control the PAS system with a torque sensor AND a PAS sensor. If I use the torque as throttle input, the motor will tend to be jerky and unstable at low speeds. If I use the PAS system only, the ride motor will not react to force, which is what I want.
I see a few options already:
So that being said, Does anybody know of such a device that acts like the Cycle Analyst V3 but is in a small "black box" package that can be easily integrated into a bike? Maybe even an open-source project of such a device would be helpful.
Thanks in advance for all your feedback!
-Zach
I'm working on building a pedal assist bike for my wife (and for myself!). The basic requirement is that I want a minimal build with minimal controls. No throttle, only pedal assist (with torque sensor).
What I have come up with is the following:
- Golden Motor Magic Pie V5 hub motor-controller combo. Chosen for the motor/controller itegration. https://goldenmotor.bike/product/black-pie-5-vector-700c-or-29er-rear-conversion-kit/
- ERider Torque Sensor. Chosen because it is compatible with my donor bike and has "dual sided" torque sensing. https://ebikes.ca/shop/electric-bicycle-parts/torque-sensors/erider68-4b.html
- PAS (it can be any PAS sensor, here is an example https://ebikes.ca/shop/electric-bicycle-parts/torque-sensors/pas-12p.html)
- 48V battery (TBD)
- magical component that is the topic of this thread
So the issue I am running into is how to control the PAS system with a torque sensor AND a PAS sensor. If I use the torque as throttle input, the motor will tend to be jerky and unstable at low speeds. If I use the PAS system only, the ride motor will not react to force, which is what I want.
I see a few options already:
- Use a Cycle Analyst V3 to do the sensor fusion and send signal to motor. This looks like quality device and a plug and play solution, but I really don't want to have a large screen (or any screen for that matter) attached to this bike.
- Use the built-in pedal assist function in the Golden Motor. But the documentation on this device is a bit lacking. Does anybody know how the PAS system on the Magic Pie V5 Works? will it work in tandem with a torque sensor? or will it only use the cadence? If this system is designed to work with cadence AND analog voltage Torque Sensor input, I would pay the extra $50 dollars to enable that feature and the issue would be solved.
- Design a simple micro-controller based solution that takes cadence and torque as inputs, does math, and sends 1V-4V out as a throttle signal. While I have the skills to do this, I'm not really interested in designing a durable, weather-proof product.
So that being said, Does anybody know of such a device that acts like the Cycle Analyst V3 but is in a small "black box" package that can be easily integrated into a bike? Maybe even an open-source project of such a device would be helpful.
Thanks in advance for all your feedback!
-Zach