The DAAAC Protocol for Accelerated Aging of Diesel Aftertreatment Systems

Gordon  Bartley, Southwest Research Institute

In December 2005, the US EPA published the “Final Rulemaking for Emissions Durability Test Procedures”. It included a bench-engine catalytic converter accelerated aging cycle for gasoline applications, but specifically stated that there was no such equivalent cycle for diesel applications. The DAAAC program was born out of this deficiency. An industry consortium began addressing the issues in December of 2008 as the DAAAC-HD Consortium. This group focused on heavy-duty applications, with DOC, cDPF and SCR technologies. Recognizing that the multitude of diesel engine applications, regulations and potential exhaust system configurations could not be simulated with a single accelerated aging cycle, the Consortium developed the DAAAC Protocol. The Protocol is a path that, when followed, results in an accelerated aging cycle directly related to the application and exhaust system configuration in question. This presentation will describe the DAAAC Protocol approach to bench-engine accelerated aging of diesel aftertreatment systems.

Download Presentation: