Tier 2 Test Fuel Impact to Tier 3 Aftertreatment Systems and Calibration Countermeasures

During the course of emissions and fuel economy (FE) testing, vehicles that are calibrated to meet Tier 3 emissions requirements currently must demonstrate compliance on Tier 3 E10 fuel while maintaining emissions capability with Tier 2 E0 fuel used for FE label determination. Tier 3 emissions regulations prescribe lower sulfur E10 gasoline blends for the U.S. market. Tier 3 emissions test fuels specified by EPA are required to contain 9.54 volume % ethanol and 8-11 ppm sulfur content. EPA Tier 2 E0 test fuel has no ethanol and has nominal 30 ppm sulfur content. Under Tier 3 rules, Tier 2 E0 test fuel is still used to determine FE. Tier 3 calibrations can have difficulty meeting low Tier 3 emissions targets while testing with Tier 2 E0 fuel. Research has revealed that the primary cause of the high emissions is deactivation of the aftertreatment system due to sulfur accumulation on the catalysts. The emissions drive cycles used in the test sequence play a significant role in catalyst deactivation. It is possible to desulfur the catalyst by employing an aggressive drive cycle to sustain catalyst temperatures above 650°C (1202°F). Drive cycles that produce the higher sustained catalyst temperatures are not found in the miles per gallon (MPG) method FE test sequence. Therefore, the aftertreatment system and calibration must be robust to sulfur accumulation during less aggressive drive cycles. A number of control tuning strategies were tested, and their robustness to sulfur accumulation on the catalysts was determined.

• Record URL:
  • https://doi.org/10.4271/2018-01-0941
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/19463952
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • White, Eugene D
  • Anderson, Bruce
  • Ranspach, Paul
• Conference:
  • WCX World Congress Experience
  • Location: Detroit Michigan, United States
  • Date: 2018-4-10 to 2018-4-12
• Publication Date: 2018-4-3

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Illustrations; References; Tables;
• Pagination: pp 507-516
• Serial:
  • SAE International Journal of Fuels and Lubricants
  • Volume: 11
  • Issue Number: 4
  • Publisher: SAE International
  • ISSN: 1946-3952
  • EISSN: 1946-3960
  • Serial URL: https://www.sae.org/publications/collections/content/E-JOURNAL-04/

Subject/Index Terms

• TRT Terms: Calibration; Catalysts; Exhaust gases; Gasoline; Pollutants
• Subject Areas: Environment; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01728684
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2018-01-0941
• Files: TRIS, SAE
• Created Date: Jan 28 2020 9:46AM