Scooterizers Snapshot Day Presentation 1 Dr. Gregory Donohoe

2 Meet the Team Jon Teske - ME Colin Gordon - CE Majed Alateeq - CE Jaeheung Park - ME [ME, CE]

Scooter Project - Introduction Last Mile Transportation Utilize Ultra-capacitor Technology Long-Lasting Highly Efficient Powerful Storage/Release Capabilities Brake-Energy Regeneration

Project Background 4 Jet-Tread Project Goals: Design and build a lightweight electric kick scooter The vehicle will incorporate regenerative braking and ultra- capacitors to provide power assisted riding without charging batteries

5 Scooterizer Project Goals: Produce a prototype scooter that is lightweight and foldable, easy to use, and provides an electronic boost for uphill travel. Provide future design teams with a database of knowledge, so that they can benefit from our project learning and experience. 5 GeneralSpecificAcceptable WeightMust be lightweight and easy to carry.20lbs. Human InputIntuitive HMI controls and feedbackThrottle/brake Energy StorageStore needed electrical energyIVUS ultra-caps EfficiencyTotal system efficiency51% or better Total Scooter CostAffordable < $750 Continuation Project Goals Improve On and Learn From Jet-Tread Design

Project Discovery 6 Identify Areas for Improvement Electrical and Control System Control system needed improvements Electrical system needed circuit isolation Human-Machine Interface Drive to Regenerative mode switch needed user-friendly enhancement Cleaner throttle Add regenerative brake control Usability of the Scooter Needed means of detaching motor from wheel (free-wheel mode)

7 Scooterizers Solution Electrical and Control System Improve circuit protection elements New control system Human-Machine Interface New throttle, brake and Drive-Regen mode switch Usability of the Scooter Add a clutch for free-wheel mode CONTROL SYSTEM CHOICESJTCommercialDesign Ease of Use 287 Cost 952 Regenerative Braking 753 Time to Implement 941 Specific to Project 8310 Documentation 3510 Debugging and Feedback 228 TOTAL

8 Improvements – Electrical and Control System

9 Modular Control System 5 boards = 4 Subsystems, with Master controller Circuit Safety/Isolation Mechanisms KISS principle: SPDT automotive relays Atmel ATMega48 Microcontrollers

10 Improvements – Human-Machine Interface Twist Throttle Easy to interface with control system’s ADC hardware Ultra-capacitor Bank Mode Switch Regenerative mode in low voltage (2.7Vdc) Drive mode in high voltage (13.5Vdc) KISS!

11 Improvements – Scooter Usability Electromagnetic Clutch for the Scooter Allows the Scooter to be used in freewheel mode Small, lightweight and easy to use with scooter control system

12 Challenges Overcome Sheer Amount of Documentation Difficult to find needed information Reverse-Engineering the ESC Circuit Lack of specific documentation required support Broken Components ESC from previous project had been “cooked” Lack of EE Knowledge Graduate student help needed Realizing the Scope of the Project Important to agree on this as a team TIME.

13 What we Learned Team Balance is Important Good Time Management is Essential State Realistic Expectations Interdisciplinary Learning [ME, CE, EE] Real-World Client Communications Lots of Individual Learning Engineers Wear LOTS of Hats!

14 Future Project Directions Open-Source Electronic Speed Controller [CE, EE] Make it reusable, configurable for other Senior Design projects Design and Build a Hub Motor [CE, EE, ME] Great idea but hard to find a commercial one Drive Mode and Regenerative Mode Power Supplies [EE] Radically increase efficiency of the system

15 Questions?