Steer-by-Wire Project Presentation

Group 7 ME 462

Sponsor: Dr. Sohel Anwar Spring 2007

Donny FranzenJimmy Huser

Ugo AnyaorahStephen Chittenden

Contents Introduction Customer Requirements Design Targets Design Changes Modeling and Analysis Analysis Results Modeling – Machining Completed Project – Demonstration Acknowledgements

Introduction Steer-by-Wire System

No Mechanical Connection between steering column and the wheels of the vehicle

Common practice in commercial airline industry Convert rotational motion into electrical signal Input electrical signal into motor for torque feedback

Torque Feedback – return to center and future inputof external stimulus (curb, pot-hole, etc.)

Installation into Bench Test System Simulate Mechanical Steering response and feel Portable & Easily Manipulated

Customer Requirements

Measure Turn Angle Conventional Feel

Torque Feedback End Stops Return-To-Center

Reliability

Quiet and Seamless Operation

Size Maintenance Safety Cost

Design Targets

Lock-To-Lock: 1080o

Angle Measurement Resolution: 0.5o

Redundancy: 3 Sensors

Torque Adjustable: 1-15 Nm Max (Endstop): 30 Nm

Return-To-Center Position: +/- 5o

Speed: 800 deg/sec (max)

Maximum Noise: 20 dB Minimum Cycles to Failure:

10 million Smooth Feel To User: 95% Conventional Design

Envelope: 510 in3

Mean Time Between System Maintenance: 50K miles

Minor Cost Differential to Conventional System: $0

Design Changes Sensors Motor End Stop Envelope Configuration Ball Bearing Locations Steve got engaged and Accepted to Law School

Modeling and Analysis Highest Priority Stress Concerns in End Stop

Analysis Results Results Positive for Proper Function

Torque = 120 in.lb

Force = 3000 lb

Max Deflection = 0.0013 in Max Stress = 12 Ksi Yield Stress = 40 Ksi

Modeling Machined Parts

Completed Project System Demonstration

Special Thanks

John Snodgrass Daniel Aw

Questions