PAS + Throttle ?

[Hyena]

OK so this is kinda a noob question from someone like me, but I've never bothered with PAS and figure rather than pull my pedals off, fit the sensor and find out, I'd ask you guys

So, can PAS and throttles happily work together or do you have to switch from one to the other ?
If used together does the bike simply go as fast as which ever input is telling it to go the fastest ? Or does one override the other ? Any jerky response ?

Looking at the controller wiring some seem to be paralleled off the throttle wires but I've seen PAS tabs on the controller circuit boards too.

A guy wants me to make him a bike with both PAS and throttle and if I can do away with having to mount an extra switch to cut the PAS signal line that'd be good.

Thanks

 

[amberwolf]

I expect it depends on the controller; I've read of some PAS systems that seem to simply provide assist or not, if you are or are not pedalling--no level of control at all. Others seem to basically use the pedal sensor as a throttle by counting how fast the pulses happen, and outputting a voltage proportionally to that. Others use an actual torque sensor of some type, and that is the throttle.

I have yet to try any PAS system; if I were to use one, it'd have to be of the latter type, essentially giving me "bionic legs", as the BionX system is intended to do. Then I would use a hand-operated throttle as an override to the PAS, so that whatever I do with that will control it, if it's not in the completely-off position. I've started more than once to design that, but stopped because of the mechanical stuff sensing the chain tension--all the simple ideas will require more electronics than I am comfortable with figuring out, and all the simple electronics need more mechanical work than I can do. I'm sure there's a happy middle ground I haven't found yet....

 

[Spacey]

I use them as Hall testers ...other than that pretty damn useless to me.

But would be interesting to hear others views on them.

 

[Hyena]

I've read of some PAS systems that seem to simply provide assist or not, if you are or are not pedalling--no level of control at all.

Yeah that's fairly useless - switching a 3v zener diode across the throttle signal line would probably have the same effect!

I'm not a fan of PAS on high powered bikes, even on the poxy 200w commercial ebike I rode it caught me off guard while stopped at an intersection and nearly pulled me under a passing car when my foot moved on the pedal.

 

[V_Mark]

I've had two different kinds. The first was on a Currie Ezip. The PAS sensor was really like an on/off switch for the throttle. You didn't have to turn PAS on, but when it was on, the throttle acted normally as long as the sensor detected pedaling motion. It was a good way to make sure that you were always helping out a little, but you could trick the sensor by putting the bike in a low gear and pedaling without actually applying any help. If you stopped pedaling, the throttle would stop working.

The other kind is on a folder I recently picked up. When you engage PAS, it will control the motor based on how fast you are pedaling. There is a one second delay or so from the time you stop pedaling to the time the motor cuts off, which takes a while to get used to. My wife had a real scare the first time she rode it; She was stopped at a light and adjusted the pedals so that they would be in optimum position for take-off, the PAS detected movement, and the throttle kicked in for an instant. It wasn't too bad, but it scared her away from Ebikes for a couple months. I've since disconnected the PAS on that bike.

 

[Dingo2024]

Jay,

not tried this myself but...............looks promising and when I get evrything else sorted then I will give it a go :wink:

check it out here

http://goldenmotor.com/SMF/index.php?topic=2499.0;prev_next=prev#new

Ian

 

[tuxman]

Reporting in on the iZip Zuma PAS system.

PAS + TAG allows for additional throttle up to the of the max of TAG system, while pedaling. If you stop pedaling while in PAS mode, TAG does nothing.

 

[Bazaki]

Today I also build a streetlegal Ebike with PAS for the first time.
I really dont like the pas Sensors, there is a delay at startup and a delay in stopping, the motor will run a second longer while you are stopping with pedalling, a bit scary for normal people.

In Europe a hand throttle is not allowed, so I guess there is no better solution.