OBD Diagnostic Strategies for LEVIII Exhaust Gas Aftertreatment Concepts

Harsha K. Nanjundaswamy; Joel Deussen; Roger Van Sickle; Dean Tomazic; Tamas Szailer; Michael Franke; Matthias Kotter; Thomas Koerfer

doi:10.4271/2015-01-1040

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.

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OBD Diagnostic Strategies for LEVIII Exhaust Gas Aftertreatment Concepts 2015-01-1040

SAE MOBILUS