Project P 13261 Introduction Group Members Dan Brownlee

Project P 13261 - Introduction Group Members: Dan Brownlee Sean Harriman Andrew Robison James Evans Joshua Doores

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

Engineering Specifications

Concept Summary � Test › › Bench Safe Reliable Robust Mobile � Traction Control System › Reduce Front Wheel Lift › Reduce Rear Wheel Slip

Conceptual Test Bench Design

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

Completed Test Bench Design

Electrical Wiring Diagram

System Testing Results Mechanical Testing � Electrical Testing � › Verified 48 VDC-to-5 VDC conversion › Verified voltage level isolation › Isolated motor with Emergency Stop switch › Successfully powered wheel speed sensors & received pulses › Implemented traction control algorithm on microcontroller

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

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

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

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

Questions? Thank you all for attending!