Particulate emission characteristics of a port-fuel-injected SI engine

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Particulate emissions from spark-ignited (SI) engines have come under close scrutiny as they tend to be smaller than 50 nm, are composed mainly of volatile organic compounds, and are emitted in significant numbers. To assess the impact of such emissions, measurements were performed in the exhaust of a current-technology port-fuel-injected SI engine, which was operated at various steady-state conditions. To gain further insights into the particulate formation mechanisms, measurements were also performed upstream of the catalytic converter. At all engine speeds, a general trend was observed in the number densities and mass concentrations: a moderate increase at low loads followed ... continued below

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8 p.

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Gupta, S.; Poola, R.; Lee, K. O. & Sekar, R. March 2, 2000.

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  • Argonne National Laboratory
    Publisher Info: Argonne National Laboratory, Argonne, IL (United States)
    Place of Publication: Argonne, Illinois

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Particulate emissions from spark-ignited (SI) engines have come under close scrutiny as they tend to be smaller than 50 nm, are composed mainly of volatile organic compounds, and are emitted in significant numbers. To assess the impact of such emissions, measurements were performed in the exhaust of a current-technology port-fuel-injected SI engine, which was operated at various steady-state conditions. To gain further insights into the particulate formation mechanisms, measurements were also performed upstream of the catalytic converter. At all engine speeds, a general trend was observed in the number densities and mass concentrations: a moderate increase at low loads followed by a decrease at mid-range loads, which was followed by a steep increase at high loads. Within reasonable bounds, one could attribute such a trend to three different mechanisms. An unidentified mechanism at low loads results in particulate emissions monotonically increasing with load. At medium loads, wherein the engine operates close to stoichiometric conditions, high exhaust temperatures lead to particulate oxidation. At high loads, combustion occurs mostly under fuel-rich conditions, and the contribution from combustion soot becomes significant. Estimates of the number of particles emitted per kilometer by a vehicle carrying the current test engine were found to be lower than those from a comparable diesel vehicle by three orders of magnitude. Similar estimates for mass emissions (grams of particulates emitted per kilometer) were found to be two orders of magnitude lower than the future regulated emission value of 0.006 (g/km) for light-duty diesel vehicles. Moreover, considering the fact that these particles have typical lifetimes of 15 min, the health hazard from particulate emissions from SI engines appears to be low.

Physical Description

8 p.

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INIS; OSTI as DE00752887

Medium: P; Size: 8 pages

Source

  • ASME Iced Spring Technical Conference, San Antonio, TX (US), 04/09/2000--04/12/2000

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  • Report No.: ANL/ES/CP-101259
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 752887
  • Archival Resource Key: ark:/67531/metadc710809

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  • March 2, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 6:03 p.m.

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Gupta, S.; Poola, R.; Lee, K. O. & Sekar, R. Particulate emission characteristics of a port-fuel-injected SI engine, article, March 2, 2000; Argonne, Illinois. (digital.library.unt.edu/ark:/67531/metadc710809/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.