Joshua Doores Meets all TTXGP safety regulations Be safely - - PowerPoint PPT Presentation

▶

Mar 21, 2023 210 likes •353 views

Group Members: Dan Brownlee Sean Harriman Andrew Robison James Evans Joshua Doores Meets all TTXGP safety regulations Be safely controlled, Serviced, Modified, and Troubleshot Conform to all TTXGP race regulations Integrate into

SLIDE 1

Group Members: Dan Brownlee Sean Harriman Andrew Robison James Evans Joshua Doores

SLIDE 2

 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

SLIDE 3

SLIDE 4

 Test Bench

› Safe › Reliable › Robust › Mobile

 Traction Control System

› Reduce Front Wheel Lift › Reduce Rear Wheel Slip

SLIDE 5

SLIDE 6

 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

SLIDE 7

SLIDE 8

SLIDE 9

 Mechanical Testing  Electrical Testing › Verified 48VDC-to-5VDC

conversion

› Verified voltage

level isolation

› Isolated motor with Emergency Stop switch › Successfully powered wheel speed sensors &

received pulses

› Implemented traction control algorithm on

microcontroller

SLIDE 10

 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

SLIDE 11

 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

SLIDE 12

 Flatten rims  Provide resistance to rear wheel  Additional sensors to better track bike

parameters

 Integration of fully built race bike  Enclosure/Casing

SLIDE 13

 Probe WSS with oscilloscope  Prevent inter-pin interference by

distancing the input pins

 Determine minimum frequency of input

pulses for accurate microcontroller

peration and reason for limit

 Test PWM of the motor controller throttle  Connect and mount the accelerometer

SLIDE 14