OBD Diagnostic Strategies for LEVIII Exhaust Gas Aftertreatment Concepts

Upcoming motor vehicle emission regulations, such as California's LEVIII, continue to tighten emission limitations in diesel vehicles. These increasingly challenging emission requirements will be met by improving the combustion process (reducing engine-out emissions), as well as improving the e...

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Bibliographic Details
Published in:SAE International Journal of Passenger Cars - Mechanical Systems 2015-04, Vol.8 (1), p.37-45, Article 2015-01-1040
Main Authors: Nanjundaswamy, Harsha K, Deussen, Joel, Van Sickle, Roger, Tomazic, Dean, Szailer, Tamas, Franke, Michael, Kotter, Matthias, Koerfer, Thomas
Format: Article
Language:English
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Summary:Upcoming motor vehicle emission regulations, such as California's LEVIII, continue to tighten emission limitations in diesel vehicles. These increasingly challenging emission requirements will be met by improving the combustion process (reducing engine-out emissions), as well as improving the exhaust gas aftertreatment efficiency. Furthermore, intricate On-Board Diagnostics (OBD) systems are required to properly diagnose and meet OBD regulation requirements for complex aftertreatment systems. Under these conditions, current monitoring strategies are unable to guarantee reliable detection of partially failed systems. Additionally, new OBD regulations require aftertreatment systems to be diagnosed as a whole. This paper covers potential OBD strategies for LEVIII aftertreatment concepts with regard to regulation compliance and robustness, while striving to use existing sensor concepts.
ISSN:1946-3995
1946-4002
1946-4002
DOI:10.4271/2015-01-1040