Project P13261 - Introduction

1. Project P13261 - Introduction Group Members: Dan Brownlee Sean Harriman Andrew Robison James Evans Joshua Doores

2. Customer Needs • Meets all TTXGP safety regulations • Be safely controlled, Serviced, Modified, and Troubleshot • Conform to all TTXGP race regulations • Integrate into an existing rolling chassis • Be ready for integration by the end of winter 2012 • Adjustability to be able to be used with multiple frames • Must fit within available club space and be easily stored • Minimize electrical energy consumption • Display drive train and vehicle parameters • Provides Driver Prompts • Maximize Acceleration

3. Engineering Specifications

4. Concept Summary • Test Bench • Safe • Reliable • Robust • Mobile • Traction Control System • Reduce Front Wheel Lift • Reduce Rear Wheel Slip

5. Conceptual Test Bench Design

6. Design Summary • Test Bench • Frame • A-Frame/motor cycle mounting • Wheel Base Adjustment • Rolling Road Resistance • Traction Control System • 3 inputs: Front WSS, Rear WSS, Accelerometer • Reduce throttle by PWM during wheel spin • Data logging via USB connection to PC

7. Completed Test Bench Design

8. Electrical Wiring Diagram

9. System Testing Results • Mechanical Testing • Electrical Testing • Verified 48VDC-to-5VDCconversion • Verified voltagelevel isolation • Isolated motor with Emergency Stop switch • Successfully powered wheel speed sensors & received pulses • Implemented traction control algorithm on microcontroller

10. Electrical Diagnostics & Troubleshooting • 1) Problem: Unexplained electrical noise at microcontroller • 2) Suspected Sources: Motor controller or motor • 3) Behavior: Throttle between Idle & Wide Open • 4) Diagnostic Steps: • Added reverse protection diode to DC-to-DC converter (no change) • Added triple capacitive filtering network to motor terminals (no change) • Disconnected DC-to-DC converter (all noise gone) • 5) Solution: Discovered incorrect WSS wiring

11. Project Evaluation: Success Or Shortcoming? • Successes • Test stand • Sensor mounting & wiring • Power distribution circuitry • Functional algorithm using wave form generators • Shortcomings • Providing rear wheel resistance • Minimal testing (long construction time) • Back-ordered parts • Accelerometer not implemented • Inability to accurately determine wheel speed

12. Future Mechanical Work • Flatten rims • Provide resistance to rear wheel • Additional sensors to better track bike parameters • Integration of fully built race bike • Enclosure/Casing

13. Future Electrical Work • Probe WSS with oscilloscope • Prevent inter-pin interference by distancing the input pins • Determine minimum frequency of input pulses for accurate microcontroller operation and reason for limit • Test PWM of the motor controller throttle • Connect and mount the accelerometer

14. Questions? Thank you all for attending!