Analytical Engine Calibration Process - Gamma … · The MathWorks Analytical Engine Calibration...
Transcript of Analytical Engine Calibration Process - Gamma … · The MathWorks Analytical Engine Calibration...
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Analytical Engine Calibration ProcessUsing GTPOWER, Stateflow, and MBC Toolbox
Pete MaloneyThe MathWorks Consulting
2002 GT-Suite Users Conference
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Pete MaloneyRichard Connors
The MathWorks ConsultingRick Hart
GM PowertrainBrad Tillock
Gamma Technologies
Project Sponsors
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Process Overview
GTPOWERHigh Fidelity Engine Model
Simulink/StateflowAutomated Virtual Engine Mapping
MBC ToolboxDesign of Experiments
MBC ToolboxModel Fitting
MBC ToolboxCalibration Generation
ECU Calibrations
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Results• Produced optimal ASAP2 calibration tables from
dual-phaser GM L-850 engine data:– MBT spark at base cam positions (park)– Exhaust cam schedule– Intake cam schedule– MBT spark at commanded phaser positions
• Calibration objectives and constraints:– Minimize BSFC at MBT spark using cam phasers– <10% increase from minimum NOx at each operating point
• Data is from a rough-cut GM L-850 GTPOWER model– NOx models need significant improvement
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GM L-850 Engine
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CourtesyGM Powertrain, Gamma Technologies
GM L-850 Engine Model
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Design of Experiments
500 point space-filling design on RPM, load, exhaust cam phase, inlet cam phase
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Virtual Testing using Stateflow
Simulink and Stateflow interact with GTPOWER to run DoE points, log data,monitor misfire and stability
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Model Building
Local models fit thetorque-spark data ateach operating point
Local model featuresare modeled usingradial basis functions
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Model Building
Torque
NOx
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Generated Calibrations
Exhaust camschedule
Inlet camschedule
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Generated Calibrations
MBT sparkat basecam position MBT spark at
commandedphaser positions
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Exported ASAP2 Calibration File
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What Has Been Achieved•Analytical Calibration Process Toolchain Now Exists
•Dyno Test Programs Can Be Analytically Prototyped
•Calibration Flexibility to Late Hardware Changes Increased?
•Drastic Test-Load Reductions Possible Due to Model Use?
•Can Speed-Density Work on Dual-Phaser Applications?
Some Questions Now Answerable