Adjust PAS on Jasion EB5 Roamer

[Hwy89]

Does anyone have experience with changing the PAS levels on a Jasion bike? I’ve contacted their customer support and they have hinted that the settings are adjustable but have failed to provide me with instructions. I did get one email that suggested I unplug the PAS sensor but that’s would involve digging out the controller which I believe is buried under the battery cradle.
I don’t like the idea of taking apart a brand new bike and probably voiding the warranty but if I can’t get instructions for changing the programing I will have to try that or just return the bike.
PAS level 1 is an instant acceleration to about 10 MPH which makes the bike very hazardous in tight places. I assembled it for a friend who is only about 5‘ tall and the PAS jerked and threw her off on her first ride.

 

[E-HP]

If it rockets up to 10 mph then holds there, then the controller is speed based instead of power based. Even if you lower PAS to 5mph, it will still be jerky and rocket up, like full throttle, to 5mph instead.

 

[amberwolf]

Even if you can access the settings, (which may be factory locked), most common pas-type systems taht don't use torque sensors simply provide full system power as soon as you start pedalling, at all, until it reaches the speed limit of the chosen assist level.

-+
There are some that use some ohter limt than speed, or a combination of speed and that ohter limit (power, current), but still provide full system power until that limit is reached, so they're still just as jerky when it kicks in, which hapepns anytime you pedal, at all.

the problem with all those systems isn't that they don't use torque sensors, but that they don't care how fast you're pedalling, only taht you are, they just use it as a trigger, when they could *easily* meausre how fast you're pedalling and provide matching power to that, based on assist level chosen.

While this is not simple, as long as the system also has a throttle input that is not affected by the assist level chosen (always provides full range of speed/etc), *and* it does not require the PAS sensor to detect you are pedalling for it to operate, then you *can* make most of those systems into cadence-controlled types, using the ebikes.ca cycle analyst; that's how i control the SB Cruiser trike. No torque sensor, just cadence PAS, which you already probably have on your system, that could be rewired to the CA instead of the existing controlelr, and if you ahve a throttle conect that to the CA instead of the controller and connect the CA throttle output to the controller instead of the thorttle. It's not plug and play, you'll have to go thru *all* the settings in the CA to set them up the wayou need them to be for your specific setup and riding conditions/etc.


Another option (taht is also not simple) is to replace the controller /display of the system with a Lishui kit that you then flash / program the open source firmware onto, and set it up the way you want it to work. If you're interested in taht, there's a big thread about the lishui FW in the middrive section of the forums.


There are other options, but all of them require replacing parts of the ebike, or "hacking" the existing ones with other parts wired in between some of them, etc.

 

[Hwy89]

I’ve never been fond of pedal assist, even the best of them are annoying, but this one is dangerous.
I’m going to go ahead with finding the controller and unplugging the PAS sensor. I’m hoping that the throttle will still work.

 

[Hwy89]

I didn’t have to take the controller all the way out. By lifting it part way out of its hole I was able to tease the PAS sensor cable out of the bottom of the bike until I could unplug it. I test rode the bike and the throttle works with a limit derermined by the pas setting 1 through 5. Now the big test to find out if the lady who owns it is happy with it.