FSAE Instrumentation 1/27/09
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Transcript of FSAE Instrumentation 1/27/09
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FSAE Instrumentation 1/27/09
Ryan GunnJohn LeeDan Van WinkleAli Yilmaz
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Formula SAE
Intercollegiate competitionNew car every yearCars designed for non-professional auto
cross racerOver 120 international teams
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FSAE Competition Scoring
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Data Acquisition System
Tuning is importantDriver feedbackQuantitative baseline
Support design decisionDriver evaluation
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Operational Concept
Real time data capturePost ProcessingReal time data transmission*Simultaneous data capture and
transmission* Data analysis and reductionNew/additional power sources**Goals
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Flow of Data in Hardware
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Sensor Selection
Shock Position SensorAccelerometerWheel Speed SensorOil Pressure SensorSteering Position Sensor
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Sensor Selection
Sensor Type Sensor Selected Requirement Specification Shock Position Novotechnik 2841
S0002 <30º angular rotation detection
100º angle range
Acceleration Analog Devices ADXL330
±3g 4 axis
±3g 4 axis
Wheel Speed Automation Direct PD1-AN-1A
<600 Hz 5000 Hz
Oil Pressure Omega PX32B1 <200 psi 2500 psi Steering Position Novotechnik SP2801
A502 <180º angular rotation
310º angle range
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DAQ Requirements
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DAQS Options
MoTecAIM SportsNational Instruments cRIO
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Motec
Pros:Ease of installationUser Friendly GUI
Cons:High cost ($4000-$6000 for data logging
unit)Limited to Motec sensorsLocked software
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AIM Sports
Pros:Cheaper than MotecMore, cheaper sensors available than
MotecCons:
Price (~$2000)Locked software
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NI cRIO
Pros:No cost for DACS or sensorsChangeable LabVIEW codeModular Customizable
Cons:Programming
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Notes
All options provided:Weight requirementFree tech support Free software
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Decision
NI cRIO is best choice for this application
Cost is a critical factorPerformance/accessibility factors can be
worked on
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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
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Decision
Wireless data transmission will not initially be pursuedData logging issuesDependabilityTime constraints
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Power Consumption
cRIO-20WAccelerometer 180 μA - 2.52 mWOil Pressure - 40mWBrake Pressure – 25mWRotary Potentiometer – 0.7mW Proximity Sensor – 200mW Total ~300mW ~1.8 Amperes
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Comparing Batteries
Current Battery ODYSS PC310Drycell
2.87 AH/kg8 AH
Possible AlternativesLi Ion
11.4 AH/kgStringent charging requirements
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Accomplished Tasks
Installed software toolsEstablished connection with the cRIOUpdated software on cRIOTested real-time monitoringTested data logging
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Real-time Monitoring
Significant lagRequires constant connection to car
(Requires wireless)Useful for testing sensors and data
acquisition codeCannot log data simultaneously (Memory
issues)A nice to have
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Testing Real-time Monitoring
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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
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Testing Data Logging
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Testing Data Logging
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Testing Data Logging
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Instructions Created
List of all modules necessary to run software
How to connect to the cRIO