OBD Algorithms: Model-based Development and Calibration 2007-01-4222
The OBD II and EOBD legislation have significantly increased the number of system components that have to be monitored in order to avoid emissions degradation. Consequently, the algorithm design and the related calibration effort is becoming more and more challenging. Because of decreasing OBD thresholds, the monitoring strategy accuracy, which is tightly related with the components tolerances and the calibration quality, has to be improved.
A model-based offline simulation of the monitoring strategies allows consideration of component and sensor tolerances as well as a first calibration optimization in the early development phase. AVL applied and improved a methodology that takes into account this information, which would require a big effort using testbed or vehicle measurements. In many cases a component influence analysis is possible before hardware is available for testbed measurements. Moreover, the number of calibration optimization loops can be significantly reduced, since the effect of different calibration datasets can also be proven on a model. Thanks to this methodology, which was verified in series development projects, the verification effort on a testbed and in vehicles can be considerably reduced.
Citation: Vitale, G., Siebenbrunner, P., Hülser, H., Bachler, J. et al., "OBD Algorithms: Model-based Development and Calibration," SAE Technical Paper 2007-01-4222, 2007, https://doi.org/10.4271/2007-01-4222. Download Citation
Author(s):
Gianluca Vitale, Patrick Siebenbrunner, Holger Hülser, Johann Bachler, Ulrich Pfahl
Affiliated:
AVL List GmbH, AVL Powertrain Engineering Inc.
Pages: 10
Event:
SAE 2007 Commercial Vehicle Engineering Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Calibration
Simulation and modeling
Optimization
Mathematical models
On-board diagnostics (OBD)
Hardware
Sensors and actuators
Legislation
Emissions
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