limit the speed of ebike

[peanut]

hello ,
So i have what i think a controller for escooter , it doesn't have normal ebike lcd connector but instead 2 wires one says LCD and other instrument.
i couldn't figure out what type of speed gauge or display i can use so iv'e desided to use it without one and only use the 3 speed switch.
My question is is there a way to limit the speed slower than the lowest speed ? because the lowest speed is way faster than 25km.
also if anyone know what i can use as display that whould be great .
I already have this controller so if i can use it and not spend money on new one that would be nice , and also i know it's maybe overkill for city bike but i like the strong acceleration
My bike is diy 48v 1000w direct drive motor

thanks in advance

 

[E-HP]

What is the purpose of limiting the speed? Is it to fool the authorities?

 

[peanut]

What is the purpose of limiting the speed? Is it to fool the authorities?

the low speed now is almost 43 , the option to go fast is nice outside of the city but inside 25 is plenty and within the legal limit

 

[E-HP]

If it isn't to fool the authorities, then just control your throttle hand and go slower.

 

[peanut]

it's not but having a set limit is easier and for peace of mind , also in case someone else used it .
just like a throttle , could wiring a resistor to reduce the signal voltage on the 3 speed switch works ?

 

[E-HP]

You could limit the throttle output with a voltage divider, and use a switch to engage the circuit, or disengage when you want the additional power.

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[amberwolf]

if you limit the throttle output, you also limit the startup torque, hill climbing, etc.

If that doesnt' matter, or switching it in and out when needed is ok, then the resistor method works fine.

Otherwise, something like the ebikes.ca cycle analyst or similar that monitors speed from a wheel sensor, takes your actual throttle as it's input and outputs a separate new throttle signal to the controller, would be a more usable option.

The CA does a lot of things beyond just this, so you might find it useful and worth the cost. if not, then you can make your own speed limiter with something like an arduino, pic, etc. (or even analog circuitry). There is at least one completed project rthread here on ES for this but in my present brainfogged state i can't fnd it, or any of hte several others i know are out there on the internet in general.

 

[peanut]

if you limit the throttle output, you also limit the startup torque, hill climbing, etc.

If that doesnt' matter, or switching it in and out when needed is ok, then the resistor method works fine.

Otherwise, something like the ebikes.ca cycle analyst or similar that monitors speed from a wheel sensor, takes your actual throttle as it's input and outputs a separate new throttle signal to the controller, would be a more usable option.

The CA does a lot of things beyond just this, so you might find it useful and worth the cost. if not, then you can make your own speed limiter with something like an arduino, pic, etc. (or even analog circuitry). There is at least one completed project rthread here on ES for this but in my present brainfogged state i can't fnd it, or any of hte several others i know are out there on the internet in general.

thanks alot for the info .
the cycle analyst is a bit pricey , and for the torque i think i'll have enough for local short trips.
i guess i'll just do the ressistor thing with a switch between limited an full speed since it's the simplest.
and i have some programing boards laying around so i'll look and see what i could do with them as interesting options.

as for what kind of screen / gauge i can use with this controller , if someone have an idea or atleast can point me to another thread that would be much appreciated , i tried looking for an answer but looks like i don't even know what to google

 

[E-HP]

if you limit the throttle output, you also limit the startup torque, hill climbing, etc.

It's the same as what the 3 speed switch does, but just makes it 4 speeds (or 6 speeds).

 

[peanut]

It's the same as what the 3 speed switch does, but just makes it 4 speeds (or 6 speeds).

yep , that's the plan .
from my search i understand that there is a voltage based pas that gives similar signal as throttle , i have to find one since the limit must also be on pas

 

[E-HP]

yep , that's the plan .
from my search i understand that there is a voltage based pas that gives similar signal as throttle , i have to find one since the limit must also be on pas

I agree that the CA is a good investment.