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Southwest Research Institute 6220 Culebra Road San Antonio, TX 78238 USA
The genesis of the DAAAC program was the EPA Final Rule for Emissions Durability Test Procedures, published in December of 2005.
It applies to the certification procedures required to sell vehicles in the U.S. The rule provides a Standard Bench Cycle (SBC) for accelerated aging of emissions system components. The SBC can be used in place of the Standard Road Cycle (SRC) that requires vehicles to be driven for 120,000 miles, with periodic emissions measurements. Using the SBC offers significant savings in both time and expense to achieve the certification requirements. However, it cannot be used for diesel-fueled vehicles. Hence, all such vehicles must currently perform the full 120,000 mile SRC procedure. Based on input from industry, there was a strong desire to have a similar Diesel Aftertreatment Accelerated Aging Cycle (DAAAC) for diesel emissions components.
On February 22, 2008, SwRI hosted the DAAAC symposium in San Antonio, TX. Fifty-nine people from thirty-four companies and organizations attended the Symposium (Attendees List). The Symposium reviewed some of the existing understanding of diesel aftertreatment system aging mechanisms and aging methods. The shared information and discussions provided insight to begin the challenge of developing a standard bench cycle for diesel aftertreatment systems.
At the Symposium, Southwest Research Institute offered the first proposal for an industry consortium to develop DAAAC aging procedures. As a result of the feedback on the initial proposal, SwRI prepared a single revised proposal designed to address the needs of both light-duty and heavy-duty.
Given the continued levels of interest in the DAAAC concept, SwRI was encouraged to continue with the initiative. The decision was made to concentrate on heavy-duty diesel aftertreatment systems. A proposal addressing heavy-duty diesel applications was sent out on July 11, 2008. Following an initial meeting on October 17, 2008, the DAAAC-HD project officially began on December 15, 2008. The project had nine members representing U.S., Japanese, European, and Korean OEMs and suppliers. The original two-year term ended on December 15, 2010. A one-year expansion was agreed to, and the expanded project term was completed on April 18, 2012. A new 2.5-year DAAAC-II project is now being set up to continue the work. In 2012, the European Union Commission requested possible use of the DAAAC Protocol© for Replacement aftertreatment system certification in the EU-VI legislation. Technical transfer of the DAAAC Protocol© is ongoing.
For further information about the DAAAC program, please contact Dr. Gordon Bartley at (210) 522-5871, or gbartley@swri.org.
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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions. |
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January 30, 2013 |
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