Stuck thumb throttle almost got me killed

[kevinmccune]

i must not have ever ridden an electric bike with that type of PAS! on all the ones i've ridden (not too many, maybe a half dozen?) you have to pedal a decent distance around the circle (like 1/4 turn or something) before the motor starts at all, and then it's somewhat gradual. the idea that the bike would go forward when you're NOT pedaling is .... strange to me. but obviously there are different ways to engineer these things.

Sometimes Peoples hands are actuating the throttle and they are unaware of it, kinda like the mysterious sudden accelerations of some vehicles, have had that happen, sort of like the time my truck wouldn't stop when I was trying to push the wrong pedal.OTH some PAS sensor ring magnets are very close together and it doesn't take much of a turn to make the bike move, however, be aware of one thing machines are not perfect and you do not want to be in the "harm zone" if a malfunction occurs my keyboard is giving me its this morning.

 

[6zfshdb]

Keep in mind the problem experienced by the OP was due to a throttle failure. The same thing could occur with a fault in the PAS or torque sensor. ALL e-bikes should have brake cutoffs IMO.

 

[fooferdoggie]

Keep in mind the problem experienced by the OP was due to a throttle failure. The same thing could occur with a fault in the PAS or torque sensor. ALL e-bikes should have brake cutoffs IMO.

a torque sensor is not going to surge your bike forward all you have to do is stop peddling.

 

[AHicks]

a toupee sensor is not going to surge your bike forward all you have to do is stop peddling.

Oh for Pete's sake. Are you regurgitating/starting over with this crap again? Can't you come up with something new?

 

[fooferdoggie]

Oh for Pete's sake. Are you regurgitating/starting over with this crap again? Can't you come up with something new?

so how is a true sensing going to cause your bike to jump forward out of control exactly?? I mean please educate me on this all you have to do is stop peddling.

 

[Mr. Coffee]

There is a very simple difference between a throttle and a pedal sensor. Any kind of pedal sensor is going to depend on continuous motion of the pedals, while a stuck throttle that stays stuck or someone holding onto the throttle will keep throttling as long as that state is in effect.

I've directly observed multiple oopsies caused by "throttle misapplication". My own personal opinion is that there are serious ergonomic issues with e-bike throttles that aren't yet addressed. Note that in a motorcycle there are multiple interlocks that don't really exist on an e-bike: in a motorcycle it is pretty obvious that the motor is on, and e-bikes do not have a clutch (well, some do but it doesn't disengage the motor).

 

[fooferdoggie]

There is a very simple difference between a throttle and a pedal sensor. Any kind of pedal sensor is going to depend on continuous motion of the pedals, while a stuck throttle that stays stuck or someone holding onto the throttle will keep throttling as long as that state is in effect.

I've directly observed multiple oopsies caused by "throttle misapplication". My own personal opinion is that there are serious ergonomic issues with e-bike throttles that aren't yet addressed. Note that in a motorcycle there are multiple interlocks that don't really exist on an e-bike: in a motorcycle it is pretty obvious that the motor is on, and e-bikes do not have a clutch (well, some do but it doesn't disengage the motor).

though I can see a cadence sensor keep going for a little bit after you stop peddling. Now I had a mid drive with a throttle and just resting my foot on the peddle would cause it to take off if I did not hold he brake levers. but still thats not really a issue and wont make the bike uncontrollable.

 

[6zfshdb]

a torque sensor is not going to surge your bike forward all you have to do is stop peddling.

Under normal conditions, this is true but we're talking about a failure. A torque or cadence sensor (or the associated wiring) could fail unexpectedly, just like the OP's throttle, and send an erroneous signal to the controller. This would cause the bike to surge forward even if it isn't being pedaled.

 

[tomjasz]

FWIW That old fashioned CA3 display has settings that can make PAS instantaneous.

A TSDZ2 can use torque settings AND a throttle.

I can have it all with a kit and not spend the price of your rather expensive ready made eBikes.

But I sayveach to his own. They’ll all turn your crank.

 

[fooferdoggie]

Under normal conditions, this is true but we're talking about a failure. A torque or cadence sensor (or the associated wiring) could fail unexpectedly, just like the OP's throttle, and send an erroneous signal to the controller. This would cause the bike to surge forward even if it isn't being pedaled.

if that happens all bets are off on what happens with the bike. the cutoff could fail or be bypassed. but a torque or cadence sensor is doing nothing when not moving its a open circuit.