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e-bike/atv jumpy throttle and deadband correction using an arduino with optional speed limiting

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akomakom/arduino-throttle-smoother

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Arduino Throttle Correction for 3-wire thottles

Purpose

This project is suitable for electric vehicles with a non-programmable controller. The arduino is inserted between a 3-wire throttle and the controller.

  • Provides smoothing for aggressive throttle response by slowing down changes in output (wheelie/jerk control)
  • Reduces throttle dead-band by mapping input to output values as per configuration
  • Optionally provides an adjustable speed limit (hardcoded or potentiometer/switch)

Wiring and Implementation

arduino-throttle-wiring.png

Wiring is very simple. Smoothing capacitor can be any value that eliminates jumping of motor speed at steady throttle. I believe that I used a 100uF for my setup.
A high value may cause the throttle to stay high longer than desired.

arduino-throttle.png Note that I added a power supply capacitor as well, but it was probably unnecessary.

Tuning

Tune behaviors according to your throttle's actual values, which you can see if you watch serial output.

If you don't want speed limiting, comment out #LIMIT_ENABLE

Note that when plugged into USB, Arduino is running at 5V, but when powered by the motor controller, it is most likely running on 4.0V-4.5V. This changes the numbers and behavior a little when you unplug USB. My Arduino clone (Pro Micro 5 volt) works fine at this voltage, your mileage may vary.

Story

This implementation came into being after I tried a variety of circuits to achieve my goals. I was setting up a mini-ATV (110cc size) as an electric garden cart tractor. It is powered by a Vevor 2KW motor and their bundled controller and 1:20 gearing.
With that amount of torque, the ATV was popping wheelies with the slightest twist of the throttle. I also wanted a speed limit for delicate maneuvering in the garden.

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