NATURE AND REDUCTION OF CYCLE-TO-CYCLE COMBUSTION VARIATION IN AN IDI DIESEL ENGINE WITH ETHANOL-DIESEL FUEL BLENDS

Many of the promising alternative fuels have relatively low cetane numbers, and may result in combustion variation problems. This paper presents the characteristics of the cycle-to-cycle combustion variations in diesel engines, and analyzes and evaluates the mechanism. Combustion variations appear in various forms, such as variations in ignition lag, indicated mean effective pressure, maximum combustion pressure, or rate of heat release. These variations are clearly correlated, and it is possible to represent the combustion variations by the standard deviation in the combustion peak pressure. The combustion variations are random (non-periodic), and are affected by ethanol amount, intake air temperature, engine speed and other various operating conditions. Theoretical analysis based on auto ignition theory showed that all of these factors affecting the combustion variations could be correlated with ignition lag; a reduction in ignition lag is the most effective to reduce combustion variation.

  • Availability:
  • Supplemental Notes:
    • International Off-Highway Meeting and Exposition Milwaukee, Wisconsin, September 12-15, 1983.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Murayama, T
    • YAMADA, T
    • MIYAMOTO, N
    • Chikahisa, T
  • Publication Date: 1983

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00381916
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 831352, HS-036 060
  • Files: HSL, USDOT
  • Created Date: Mar 30 1984 12:00AM