The Diesel Aftertreatment Accelerated Aging Cycles Protocol 


Date Recorded: July 28, 2020
Host: Scott Eakle
Duration: 54:29


As agencies and governing bodies evaluate the feasibility of reduced emission standards, additional focus has been placed on technology durability. This is seen in proposed updates, which would require Original Equipment Manufacturers (OEMs) to certify engine families utilizing a full useful life (FUL) aftertreatment system. These kinds of proposed rulings would place a heavy burden on the manufacturer to generate FUL components utilizing traditional engine aging methods. Complications in this process will also increase the product development effort and will likely limit the amount of aftertreatment durability testing. There is also uncertainty regarding the aging approach and the representative impact compared to field aged units. Existing methodologies have evolved to account for several deterioration mechanisms that, when controlled, can be utilized to create a flexible aging protocol. As a result, these methodologies provide the necessary foundation for continued development.

The Diesel Aftertreatment Accelerated Aging Cycles (DAAAC) protocol considers thermal loading, lubricant derived poisoning, and sulfur exposure as integral elements for aftertreatment aging. Combining these elements simulates deterioration mechanisms observed during normal vehicle operation. In doing so, these elements are introduced at an accelerated rate to reduce aging duration by a factor of ten. This discussion describes the DAAAC Protocol in detail and how it can be applied to generate full useful life aged emissions control components.

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