Mellow out throttle without sacrificing full throttle?

[quuxman]

Is there an analog way to mellow out a throttle without sacrificing full throttle (like adding a resistor would?). My setup is quite jumpy in the first 1/3 of the throttle, but I can't think of a way to reduce the voltage in this range without reducing full throttle. Unfortunately I do not have a new Cycle Analyst that allows throttle remapping. Another option would be to reprogram the controller. I have a KT29 with a KT-LCD3 display, so this open source controller firmware project may work:

GitHub - stancecoke/BMSBattery_S_controllers_firmware: OSEC Open Source E-Bike Controller in a Windows toolchain for a STM8

OSEC Open Source E-Bike Controller in a Windows toolchain for a STM8 - stancecoke/BMSBattery_S_controllers_firmware

github.com

Has anybody used that firmware successfully?

 

[quuxman]

I just found this thread. Something like this is probably the simplest solution:

Barron Greig's Throttle Remapper

Hi Folks, This thread describes a circuit to take the signal voltage from a 5V throttle and remap that voltage under software control of a Picaxe chip. I have an electric bicycle with a Grin Technologies Phaserunner V2 with a single throttle providing both drive and regen braking. With this...

endless-sphere.com

 

[amberwolf]

Another option if you're willing to do some coding is

Universal PAS sensor converter - arduino project.

In most of my bikes I'm using cheap controllers without display and PAS option, and using throttle in the city is quite convenient. But riding with PAS is even more comfortable for me. So I've decided to develop universal converter, that allows to connect PAS sensor to any controller with...

endless-sphere.com

which you could use to do the remapping. (and if you also have PAS you can have much better control over the system by feeding this with it than the KT).

 

[TommyCat]

Hi quuxman,

How mellow are you looking to do? Slight 1/2 second hesitation, or 2 second mild delay (ramp up) or longer?
Working on a project to accomplish this.

What are your throttle input and output voltages now.
Would you like to plot its operational curve to double check that it's not a throttle problem? See this thread...
Guide to Hall Sensor Throttle operation, testing, and modification. - Electricbike.com Ebike Forum


Regards,
T.C.

 

[Chalo]

You might be able to get what you want by using a pot throttle in place of a Hall effect throttle (with or without a low value inline resistor added).