Dedicated EGR: A New Concept in High Efficiency Engines

The use of high levels of EGR has been documented to increase fuel efficiency and reduce emissions of spark ignition engines [1–5]. However, these engines typically face challenges in EGR control and tolerance, which can reduce the expected efficiency improvement. A concept developed by Southwest Research Institute explores the potential of an engine with individual cylinders dedicated to EGR production to overcome the challenges associated with EGR tolerance and control. In this study, a 4-cylinder engine was run with cylinder 1 exhausting directly to the intake manifold, leading to a constant 25% EGR level. The engine was run naturally aspirated over a large portion of the performance map at an ultra-high (14:1) compression ratio. As a part of the study, air-to-fuel ratio in cylinder 1 was varied from stoichiometric to rich to determine the effect of the products of partial combustion on EGR tolerance and fuel consumption. The results show that this concept results in large gains in fuel efficiency over the baseline, low compression ratio engine and significantly reduces the exhaust emissions from the other 3 cylinders.

• Record URL:
  • https://doi.org/10.4271/2009-01-0694
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/19463936
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • Alger, Terry
  • Mangold, Barrett
• Conference:
  • SAE World Congress & Exhibition
  • Location: Detroit Michigan, United States
  • Date: 2008-4-14 to 2008-4-17
• Publication Date: 2009-4-20

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 620-631
• Serial:
  • SAE International Journal of Engines
  • Volume: 2
  • Issue Number: 1
  • Publisher: SAE International
  • ISSN: 1946-3936
  • EISSN: 1946-3944
  • Serial URL: https://www.sae.org/publications/collections/content/E-JOURNAL-03/

Subject/Index Terms

• TRT Terms: Engine performance; Exhaust gas recirculation; Fuel consumption; Performance tests; Pollutants; Spark ignition engines
• Subject Areas: Energy; Environment; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01689809
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2009-01-0694
• Files: TRIS, SAE
• Created Date: Dec 27 2018 10:58AM