Scooterizers Snapshot Day Presentation
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Dr. Gregory Donohoe
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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
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TEAM
JET-TREAD
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
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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.
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General Specific Acceptable
Weight Must be lightweight and easy to carry. 20lbs.Human Input Intuitive HMI controls and feedback Throttle/brakeEnergy Storage Store needed electrical energy IVUS ultra-capsEfficiency Total system efficiency 51% or betterTotal Scooter Cost Affordable < $750
Continuation Project Goals
Improve On and Learn From Jet-Tread Design
Project Discovery
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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)
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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 CHOICES JT Commercial Design
Ease of Use 2 8 7 Cost 9 5 2 Regenerative Braking 7 5 3 Time to Implement 9 4 1 Specific to Project 8 3 10 Documentation 3 5 10 Debugging and Feedback 2 2 8 TOTAL 40 32 41
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Improvements – Electrical and Control System
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Improvements – Electrical and Control SystemModular Control System• 5 boards = 4 Subsystems, with Master controller
Circuit Safety/Isolation Mechanisms• KISS principle: SPDT automotive relays
SPDT Switch
Atmel ATMega48Microcontrollers
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Improvements – Human-Machine InterfaceTwist 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!
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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
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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.
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What we LearnedTeam 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!
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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
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Questions?