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?