How to get instant power with torque sensor and ca3?

[eecsflyer]

I have an erider torque sensor, https://ebikes.ca/erider68-4b.html, and a Cycle Analyst v3 and cannot figure out how to set it up to apply power to the motor as soon as I apply pressure to the pedals.

My main goal is to have the system help me start pedaling. This is especially useful when I stop at a light in a hard gear. From what I can tell, I need to actually rotate the crank to trigger a few PAS poles before the motor applies power. I want it to apply power without any rotation of the crank, which sometimes is very difficult for me as I am on a handcycle.

How do I trigger the motor to apply power purely based on torque sensing and not pedal rotation?

Thanks for the help..

 

[JackFlorey]

How do I trigger the motor to apply power purely based on torque sensing and not pedal rotation?

You can try adjusting the start threshold for PAS. (I am assuming you have configured it correctly for the torque sensor to begin with.)

If you have the CA3 app, it's a lot easier to use than going through the menus on the CA3. The two parameters to try adjusting are "Torque assist averaging" and "start threshold." The CA3 will not start assisting until the threshold is reached, and will use the average over X poles to set the output torque. You cannot set it any lower than 1, so you may have to get at least a little crank rotation. Perhaps backpedaling a bit and then reversing would work if you change those parameters?

For an alternative, consider a throttle button that gives you (say) 500 watts to get you started. If there's any way for you to use a standard throttle, of course, that's a much better option there. Perhaps a paddle you can nudge with your head or something? Like a modified version of this:

https://www.fridayparts.com/throttle-foot-throttle-pedal-efp-005-0-5k-efp713-0502-electric-accelerator-for-ev-curtis?gclid=CjwKCAjw_o-HBhAsEiwANqYhp5jtekBl5wbu2dtJHSeZeG8gaZbve57HU_4YOQJHop5CwKFuwaD-tRoCFsEQAvD_BwE

 

[qwerkus]

I have an erider torque sensor, https://ebikes.ca/erider68-4b.html, and a Cycle Analyst v3 and cannot figure out how to set it up to apply power to the motor as soon as I apply pressure to the pedals.

My main goal is to have the system help me start pedaling. This is especially useful when I stop at a light in a hard gear. From what I can tell, I need to actually rotate the crank to trigger a few PAS poles before the motor applies power. I want it to apply power without any rotation of the crank, which sometimes is very difficult for me as I am on a handcycle.

How do I trigger the motor to apply power purely based on torque sensing and not pedal rotation?

Thanks for the help..

That's not possible with an erider. Basically those torque sensor work as a combined PAS and a sindle sensor, so you need enough pas input to allow for the torque calculation. With 36 magnets, it's pretty quick though.
If you want a 0 start help, the only option is a throttle. If you live in the EU, you can legally configure it to 6km/h max, and use it as a jump start.

 

[HrKlev]

Only way is to wire the torque output to the throttle input, but that would mean the assist will be purely torque based, and not wattage, so it is not optimal. Best would be a button or hand throttle like suggested, thats what I use. I think it is legal to have assistance up to 6kmh without rotating the pedals in most countries. Thats walk assist on the commercial ebikes.

 

[dogman dan]

Good example of why I always prefer a throttle. Getting started is still my biggest problem. I much prefer to stay in my favorite gear, let the motor get me going, then start pedaling.

Too sensitive a pas is not a good idea. One twitch at a light, and you might zoom in front of a cement truck.

So adding a throttle is really your best approach.