analytical engine calibration process - gamma … · the mathworks analytical engine calibration...
TRANSCRIPT
The MathWorks
www.mathworks.com
Analytical Engine Calibration ProcessUsing GTPOWER, Stateflow, and MBC Toolbox
Pete MaloneyThe MathWorks Consulting
2002 GT-Suite Users Conference
The MathWorks
www.mathworks.com
Pete MaloneyRichard Connors
The MathWorks ConsultingRick Hart
GM PowertrainBrad Tillock
Gamma Technologies
Project Sponsors
The MathWorks
www.mathworks.com
Process Overview
GTPOWERHigh Fidelity Engine Model
Simulink/StateflowAutomated Virtual Engine Mapping
MBC ToolboxDesign of Experiments
MBC ToolboxModel Fitting
MBC ToolboxCalibration Generation
ECU Calibrations
The MathWorks
www.mathworks.com
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
The MathWorks
www.mathworks.com
GM L-850 Engine
The MathWorks
www.mathworks.com
CourtesyGM Powertrain, Gamma Technologies
GM L-850 Engine Model
The MathWorks
www.mathworks.com
Design of Experiments
500 point space-filling design on RPM, load, exhaust cam phase, inlet cam phase
The MathWorks
www.mathworks.com
Virtual Testing using Stateflow
Simulink and Stateflow interact with GTPOWER to run DoE points, log data,monitor misfire and stability
The MathWorks
www.mathworks.com
Model Building
Local models fit thetorque-spark data ateach operating point
Local model featuresare modeled usingradial basis functions
The MathWorks
www.mathworks.com
Model Building
Torque
NOx
The MathWorks
www.mathworks.com
Generated Calibrations
Exhaust camschedule
Inlet camschedule
The MathWorks
www.mathworks.com
Generated Calibrations
MBT sparkat basecam position MBT spark at
commandedphaser positions
The MathWorks
www.mathworks.com
Exported ASAP2 Calibration File
The MathWorks
www.mathworks.com
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