brains
1 µW
- Joined
- Jun 20, 2021
- Messages
- 4
Howdy-
-I've just cobbled together my first eBike and it's about all there but I'm having some issues with the pedal assist function. The pedal assist delivery seems to be random, or, dependent on my cadence. The assist cuts off when I pedal relatively* fast. If I just lazily spin the cranks without actually pedaling the bike, the motor usually gives me full power but If I actually pedal the thing like I would on a regular bicycle the motor isn't interested in helping half the time. The other half the time I get some sporadic power delivery that cuts in and out.
Also: the display isn't giving me the correct speed. The display looks like it's showing me motor RPM's instead: It goes to 0 while coasting, and when the motor surges during it's sporadic PAS power delivery the speed spikes with it.
Some background...
Build is a super cheap 36v Brainpower controller/lcd display with throttle and pedal assist (assist levels 1-5, with 5 seemingly being "fast") paired with a UPP 36v battery and Suntour HESC 250w motor. The controller and related components were all purchased together as a kit. All traces of the suntour HESC system are gone except for the motor. I am using the external speed sensor that came with the kit- I did not connect the white wire from the motor to anything.
-The throttle works reliably 100% of the time. When the pedal assist cuts out, I can still throttle up so I don't believe it to be any sort of thermal cut off or power drawing issue.
-The speed reading isn't correct... I think. It looks like it's reading the motor RPM's- it reads 0kph when coasting, and If I pedal with the brake cut off engaged it reads 0 as well. My max speed according to the display was 56kph, which seems a bit (a lot) on the high side. The speed sensor doesn't seem to be working, but the controller is still getting a speed reading from somewhere.
-The PAS magnet disc is about 2mm away from the sensor and is even. The power assist seems more dependent on me having a super slow cadence for it to be reliable. I can get some power when pedaling normally, but it is typically punchy: the motor revs up and cuts off. The motor doesn't seem to rev past some sort of max- I can get more RPMs with the throttle, so I don't believe it to be a voltage/amperage cut off.
-The controller has a potentiometer that I fiddled with, but I thought i've read other posts where people figured it doesn't really do much.
So, what's up.
Did I plug my PAS sensor into the speed sensor?
Am I getting a voltage/amperage cut off with the pedal assist that doesn't happen while using the throttle... for some reason?
Is this just how the pedal assist works and I'm not supposed to actually pedal the bike and just let the motor do the work? (it's pretty fun and it works great if I just use the throttle as an assist while pedaling).
-I've just cobbled together my first eBike and it's about all there but I'm having some issues with the pedal assist function. The pedal assist delivery seems to be random, or, dependent on my cadence. The assist cuts off when I pedal relatively* fast. If I just lazily spin the cranks without actually pedaling the bike, the motor usually gives me full power but If I actually pedal the thing like I would on a regular bicycle the motor isn't interested in helping half the time. The other half the time I get some sporadic power delivery that cuts in and out.
Also: the display isn't giving me the correct speed. The display looks like it's showing me motor RPM's instead: It goes to 0 while coasting, and when the motor surges during it's sporadic PAS power delivery the speed spikes with it.
Some background...
Build is a super cheap 36v Brainpower controller/lcd display with throttle and pedal assist (assist levels 1-5, with 5 seemingly being "fast") paired with a UPP 36v battery and Suntour HESC 250w motor. The controller and related components were all purchased together as a kit. All traces of the suntour HESC system are gone except for the motor. I am using the external speed sensor that came with the kit- I did not connect the white wire from the motor to anything.
-The throttle works reliably 100% of the time. When the pedal assist cuts out, I can still throttle up so I don't believe it to be any sort of thermal cut off or power drawing issue.
-The speed reading isn't correct... I think. It looks like it's reading the motor RPM's- it reads 0kph when coasting, and If I pedal with the brake cut off engaged it reads 0 as well. My max speed according to the display was 56kph, which seems a bit (a lot) on the high side. The speed sensor doesn't seem to be working, but the controller is still getting a speed reading from somewhere.
-The PAS magnet disc is about 2mm away from the sensor and is even. The power assist seems more dependent on me having a super slow cadence for it to be reliable. I can get some power when pedaling normally, but it is typically punchy: the motor revs up and cuts off. The motor doesn't seem to rev past some sort of max- I can get more RPMs with the throttle, so I don't believe it to be a voltage/amperage cut off.
-The controller has a potentiometer that I fiddled with, but I thought i've read other posts where people figured it doesn't really do much.
So, what's up.
Did I plug my PAS sensor into the speed sensor?
Am I getting a voltage/amperage cut off with the pedal assist that doesn't happen while using the throttle... for some reason?
Is this just how the pedal assist works and I'm not supposed to actually pedal the bike and just let the motor do the work? (it's pretty fun and it works great if I just use the throttle as an assist while pedaling).