ANALYSIS OF EFFECTS OF EGR ON FUEL ECONOMY

Effects of EGR on fuel consumption were analyzed quantitatively in terms of fuel economy improvement and deteriorating factors through experiments as well as thermodynamic calculations. To examine the effects of combustion duration on fuel economy under heavy EGR, experiments were performed with three engine variations. In calculation models, changes in specific heats, heat transfer rate, and dissociation rate caused by changes in gas temperature were considered. In conclusion, it may be stated that reductions of pumping loss, cooling loss, and dissociation were found to be improving factors, where their contribution ratio was approximately 4.5:4.0:1.5. The sum of calculated fuel economy gain increased steadily as EGR increases, and reached more than 10% at 20% egr under light load condition. On the other hand, a major deteriorating factor was found to be combustion fluctuation. This combustion fluctuation could be significantly reduced by achieving a "fast burn" through increased turbulence and/or dual-point ignition.(a) (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/6664983
• Corporate Authors:

  Society of Automotive Engineers of Japan

  10-2 Goban-cho, Chiyoda-ku
  Tokyo,   Japan 
• Authors:
  • NAKAJIMA, Y
  • Sugihara, K
  • Takagi, Y
• Publication Date: 1981-7

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 7-14
• Serial:
  • JSAE Review
  • Issue Number: 5
  • Publisher: Society of Automotive Engineers of Japan
  • ISSN: 0389-4304
  • Serial URL: http://www.sciencedirect.com/science/journal/03894304

Subject/Index Terms

• TRT Terms: Combustion; Cooling; Durability; Exhaust gas recirculation; Exhaust gases; Fuel consumption; Heat transfer; Losses; Methodology; Motors; Nitrogen; Oxides; Pumps; Recycling; Simulation; Specific heat
• Uncontrolled Terms: Decreases
• ITRD Terms: 3860: Combustion; 9009: Decrease; 2442: Emission; 232: Fuel consumption; 9102: Method; 1334: Motor; 7128: Nitrogen; 7372: Oxide; 4573: Recycling (mater); 9103: Simulation
• Subject Areas: Energy; Highways; Vehicles and Equipment; I96: Vehicle Operating Costs;

Filing Info

• Accession Number: 00349985
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Report/Paper Numbers: HS-032 757
• Files: HSL, ITRD, TRIS
• Created Date: Jul 30 1982 12:00AM