Worldwide OBD (On-Board-Diagnosis) legislation has and will be tightened drastically. In the US, OBD II for PC (Passenger Car) and the introduction of HD (Heavy Duty) OBD for HD vehicles in 2010 will be the next steps. Further challenges have come up with the introduction of active exhaust gas aftertreatment components to meet the lower future emission standards, especially with the implementation of combined DPF (Diesel Particulate Filter)-De-NOx-systems for PC and HD engines. Following such an increase in complexity, more comprehensive algorithms and software have to be developed to cope with the legislative requirements for exhaust gas aftertreatment devices. The calibration has to assure the proper functionality of OBD under all driving situations and ambient conditions. A new simulation-based development methodology for both algorithm design and calibration was developed by AVL and successfully applied to the integration of SCR systems in series production programs. OBD monitoring algorithms for SCR (Selective Catalytic Reduction) systems could be developed and validated using simulation models, long before components, final specifications or even the system layout was available. Using a simulation-based methodology, including a model for engine and the exhaust gas aftertreatment components and an automated data analyzing tool, the calibration time on engine test bench and in vehicle can be reduced considerably. A big advantage of such a procedure is the strong reduction of the verification effort in fleet testing and the easy, automated data analysis. Hence a time efficient and cost saving project approach could be established. This paper describes the single steps of this methodology up to SOP (Start of Production), underlined by experiences gained in projects for PC OBD II and HD OBD.
OBD of De-NO(x)-systems - requirements for software development and calibration for 2010 and beyond
Onboard-Diagnose von Denitrifikationssystemen - Anforderungen an die Software-Entwicklung und die Kalibrierung für 2010 und danach
2008
9 Seiten, 15 Bilder, 5 Quellen
Conference paper
English
Schwerfahrzeug , Onboard-Diagnose-System , Denitrifikation , USA (United States of America) , Software-Entwicklung , Kalibrieren (Abgleichen) , Pkw (Personenkraftwagen) , Abgasemission , Nachbehandlung , Dieselpartikelfilter , Algorithmus , Gesetzgebung , Simulationsmodell , katalytische Reduktion , Motorprüfstand , Datenanalyse , selektive katalytische Reduktion
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