Secondary Switch Throttle

[JennyB]

Quite often, when I'm in a low aero position on rolling hills or fighting a gusting headwind, I could do with a momentary pulse of power to maintain speed without having to move my hand back to the main throttle. Since this would only be used at speed, would a simple direct connection of throttle-in to throttle-out suffice, or is something more subtle required? :?

 

[d8veh]

It's fairly cheap to add a second throttle and switch. Take the spring out of a thumb throttle; join the red and black wires to your normal throttle; jion the two signal wires to a SPDT switch with the common (middle) connected to the controller. You can then set a speed on the thumb throttle (which you can adjust when you want), and when you hit the switch, your bike will go at that speed. Switch back and you've got normal throttle.

Here's a picture of the whole assembly. Starts at post #31:
http://www.pedelecs.co.uk/forum/electric-bicycles/13813-cst-its-all-working-5.html

 

[pendragon8000]

It's fairly cheap to add a second throttle and switch. Take the spring out of a thumb throttle; join the red and black wires to your normal throttle; jion the two signal wires to a SPDT switch with the common (middle) connected to the controller. You can then set a speed on the thumb throttle (which you can adjust when you want), and when you hit the switch, your bike will go at that speed. Switch back and you've got normal throttle.

Here's a picture of the whole assembly. Starts at post #31:
http://www.pedelecs.co.uk/forum/electric-bicycles/13813-cst-its-all-working-5.html

man that sounds crazy complicated!
i would say get a ca v3 and use the aux port to put your power restriction switch (thats just a good mod for any ebike) and then have a push putton under yor thumb to "give it some" that puts it in max power mode... or have just the push button shorting the aux, and a variable resistor parallel with it. set variable resistor to what you want as normal power. hmm that sound a bit complicated to but after doing the ca v3 power switch mod myself (about 1-2hs work) it seems like a good option.

 

[Samd]

Actually i have to say that d8veh has a nice simple idea there. I like it. I want something to coast while i hand signal around roundabouts. Nice.

And i hate the look of the CA. Expensive too.

 

[pendragon8000]

fair enough... i love tec and customizing..

 

[adrian_sm]

Quite often, when I'm in a low aero position on rolling hills or fishing a gusting headwind, I could do with a momentary pulse of power to maintain speed without having to move my hand back to the main throttle. Ince this work ldonly be used at speed, would a simple direct connection of throttle-in to throttle-out suffice, or is something more subtle required? :?

Full throttle is not 5V, but something more like 4V. A simple voltage divider should work. Two resistors one switch.

What controller do you have? It may already have another throttle connection point for a pot throttle which would make things easy.

 

[JennyB]

Thanks, guys! Dv8's solution looks interesting, and gives a little more than what I asked for. 8)

I'll give it a try.

 

[d8veh]

Thanks, guys! Dv8's solution looks interesting, and gives a little more than what I asked for. 8)

I'll give it a try.

I have this arrangement on all my bikes now. It works as a cruise control. If you have brake cut-offs (recommended), you can switch the cruise on as soon as you start and then use the brakes when you want to slow down for corners.

You could also take the spring out of your normal throttle (best with a thumb throttle) and put a switch on the signal wire, which would give a similar effect and would be simpler, but I like to have both.