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FSAE Instrumentation 1/27/09

FSAE Instrumentation 1/27/09. Ryan Gunn John Lee Dan Van Winkle Ali Yilmaz. Formula SAE. Intercollegiate competition New car every year Cars designed for non-professional auto cross racer Over 120 international teams. FSAE Competition Scoring. Data Acquisition System.

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FSAE Instrumentation 1/27/09

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  1. FSAE Instrumentation 1/27/09 Ryan Gunn John Lee Dan Van Winkle Ali Yilmaz

  2. Formula SAE • Intercollegiate competition • New car every year • Cars designed for non-professional auto cross racer • Over 120 international teams

  3. FSAE Competition Scoring

  4. Data Acquisition System • Tuning is important • Driver feedback • Quantitative baseline • Support design decision • Driver evaluation

  5. Operational Concept • Real time data capture • Post Processing • Real time data transmission* • Simultaneous data capture and transmission* • Data analysis and reduction • New/additional power sources* *Goals

  6. Flow of Data in Hardware

  7. Sensor Selection • Shock Position Sensor • Accelerometer • Wheel Speed Sensor • Oil Pressure Sensor • Steering Position Sensor

  8. Sensor Selection

  9. DAQ Requirements

  10. DAQS Options MoTec AIM Sports National Instruments cRIO

  11. Motec • Pros: • Ease of installation • User Friendly GUI • Cons: • High cost ($4000-$6000 for data logging unit) • Limited to Motec sensors • Locked software

  12. AIM Sports • Pros: • Cheaper than Motec • More, cheaper sensors available than Motec • Cons: • Price (~$2000) • Locked software

  13. NI cRIO • Pros: • No cost for DACS or sensors • Changeable LabVIEW code • Modular  Customizable • Cons: • Programming

  14. Notes • All options provided: • Weight requirement • Free tech support • Free software

  15. Decision NI cRIO is best choice for this application Cost is a critical factor Performance/accessibility factors can be worked on

  16. Wireless Transmission • Daniel Alford, “Light Weight, Low Cost, Automotive Data Acquisition and Telemetry System" (MS thesis, University of Cincinnati, 2005) • “The testing performed shows that the wireless networking technology does not adversely affect the data being transferred” • Standard antenna not well suited (range) • Line of sight issues are the major problem

  17. Decision • Wireless data transmission will not initially be pursued • Data logging issues • Dependability • Time constraints

  18. Power Consumption • cRIO-20W • Accelerometer 180 μA - 2.52 mW • Oil Pressure - 40mW • Brake Pressure – 25mW • Rotary Potentiometer – 0.7mW • Proximity Sensor – 200mW • Total ~300mW ~1.8 Amperes

  19. Comparing Batteries • Current Battery ODYSS PC310 • Drycell • 2.87 AH/kg • 8 AH • Possible Alternatives • Li Ion • 11.4 AH/kg • Stringent charging requirements

  20. Accomplished Tasks • Installed software tools • Established connection with the cRIO • Updated software on cRIO • Tested real-time monitoring • Tested data logging

  21. Real-time Monitoring • Significant lag • Requires constant connection to car (Requires wireless) • Useful for testing sensors and data acquisition code • Cannot log data simultaneously (Memory issues) • A nice to have

  22. Testing Real-time Monitoring

  23. Data Logging • Currently must be connected to computer • Switch to turn on and off • Boot file • More complex process than real-time monitoring • Allows for future analyzing of data

  24. Testing Data Logging

  25. Testing Data Logging

  26. Testing Data Logging

  27. Instructions Created • List of all modules necessary to run software • How to connect to the cRIO

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