Yes you can have different speed limits for PAS and the Throttle!by cnrd » Aug 04 2020 2:38am
Does anyone know if it's possible to set different speed limits for PAS and throttle?
I would like to set a lower speed limit on PAS, but still have extra speed available on the throttle.
At 92V, you have about 8mA for accessories, per the unofficial user guide. Typical hall throttle takes 5mA, typical PAS takes 10mA. With just these two, you're asking almost double the current the CA can provide. You need a different power source for the PAS. You could pull from the controller throttle +5V, or run a dc converter off the DC power output jack on the CA to the PAS.Djhandz wrote: ↑Sep 26 2020 7:02amHi all. Reading a few horror stories about people blowing there cycle analyst
Please can someone tell me if it's safe to use this pas sensor
https://www.ebikes.ca/shop/electric-bic ... p-chr.html
Plugged in to the pas plug on 10v running a 22s battery fully charged 92v
Will this setup be ok or do I need to reposition the 10v to the 5v inside the cycle analyst?
Thanks
Thanks a lot for the in-depth explanation. It makes a lot of sense. I am enjoying the feature on a phaserunner controller nowjustin_le wrote: ↑Sep 23 2020 6:09pmThis is a great question and was actually on the CA3 roadmap for a while, but we decided to pull it from the list. As NCC1941 pointed out, the CA3 only sees your battery current, not your phase current. At constant phase current the battery current is almost 0A at low speeds and then linearly increases until reaching your actual phase amps once you get near the unloaded cruising speed. It is possible for the CA3 to emulate this behavior and have a setting that is a fixed watts/kph, so as you go faster then it will inject proportionally higher watts even with the throttle off. But even with that algorithm in place it there were also the following two problems:
a) Many motor controllers do not behave well at all when you try to command a very low wattage from them in a constant watts by modulating the throttle. and
b) Many setups have lights, DC-DC converters, and other accessories powered by the CA in a way that the CA also shows the watts of these accessory components. So then if you flip on your headlights or blast a horn or whatever it could add some 10's of watts to the CA's power reading which it couldn't distinguish from watts going into the motor which would mess up this behavior.
Yes, actually more to the point I'm strongly considering in the next update that we just drop the watts/Hwatt scaling factor and have it instead be Watts/Nm. This is actually the original implimentation of the CA3 way way in the early beta/alpha firmwares. It was switched over to being W/HW because we thought that would be a more straightforward parameter for people to understand (oh, it just doubles my power), but I think most people would prefer if the motor power scaled linearly with pedal torque regardless of RPM. Then the RPM is just an on/off gate, and it makes it easier to have torque assist at 0 rpm, and if after like half a second ifthere is still no pedal cadence detected then it would shut off the PAS. Probably not in 3.15, but likely in 3.2.
Edit: So I just realized after I wrote this.... Since Im not using throttle, maybe I could just split the 0-5v signal from the torque sensor to the throttle input and set up one of the presets to be throttle input only. That should get me torque mode with assistance from 0rpm, and I could adjust the throttle input ramping to get the desired behaviour.... hmm....
Very, very interesting! Just a note from a tsdz2 equipped bike I had where I could choose pure torque lode; It was very hard to maintain a high cadence when I was cycling on a normal road. It might be something with the torque sensor or the motor, so maybe it is not applicabke at all.... But it was a lot easier with power mode. So maybe have a way to switch between the modes?justin_le wrote: ↑Sep 29 2020 3:23am
Yes, actually more to the point I'm strongly considering in the next update that we just drop the watts/Hwatt scaling factor and have it instead be Watts/Nm. This is actually the original implimentation of the CA3 way way in the early beta/alpha firmwares. It was switched over to being W/HW because we thought that would be a more straightforward parameter for people to understand (oh, it just doubles my power), but I think most people would prefer if the motor power scaled linearly with pedal torque regardless of RPM. Then the RPM is just an on/off gate, and it makes it easier to have torque assist at 0 rpm, and if after like half a second ifthere is still no pedal cadence detected then it would shut off the PAS. Probably not in 3.15, but likely in 3.2.
Awesome! Sorry for being such a electronics noob (I have no idea what that resistor doesjustin_le wrote: ↑Sep 29 2020 3:23am
You can absolutely do this. And you can actually do it even with a throttle too by just parallel connecting the analog signals together. The throttle can't pull down but it can pull up which means you don't need any diodes for this. Just put like a 500 Ohm resistor between the torque signal and the throttle input while the throttle signal connects directly. If you don't use the throttle, the signal will come from the torque sensor, and if you do use the throttle then it will generally read the higher of the torque or the throttle signal.
)... do you mean like this?
My appolgies.
) burnt the PCB/main PIC of my CA's.Any news on this, or other smart workaround? I have a 36 pole torque sensor on one of my bikes. Im using 18 pole setting for now, and just use half the assist numbers and divide all the statistics in 2. It works kind of OK, but one of my favorite things with the CA is all the data you get instantly, and when the numbers are not what they really are it is quite annoying :p
