THREE-WAY CONVERSION CATALYSTS ON VEHICLES FUELED WITH ETHANOL-GASOLINE MIXTURES

Three-way conversion catalysts systems which provide control of three emission components -- hydrocarbons, carbon monoxide, and oxides of nitrogen -- generally require the use of closed-loop feedback control of the air/fuel metering system to provide a near stoichiometric exhaust gas composition. As an alternate fuel such as ethyl-alcohol is added to gasoline, the stoichiometric air/fuel ratio is altered. Conventional air/fuel metering systems do not compensate for this change. This paper studies the ability of the Volvo closed-loop control fuel injection system, now in use on vehicles in the United States, to maintain the stoichiometric air/fuel mixture needed for optimum emission control and to compensate for the change in fuel stoichiometry encountered in gasoline/alternate fuel mixtures. The system was found to have the ability to completely compensate for gasoline/ethyl alcohol mixtures up to 30% ethyl alcohol with no loss in emission control. Gasoline/methyl alcohol blends were also tested successfully.

  • Supplemental Notes:
    • From the February 26-March 2, 1979 Meeting.
  • Corporate Authors:

    Society of Automotive Engineers

    400 Commonwealth Drive
    Warrendale, PA  USA  15096
  • Authors:
    • Mooney, J J
    • Hansel, J G
    • Burns, K R
  • Publication Date: 1979

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00301564
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 790428 Conf Paper
  • Files: TRIS
  • Created Date: Nov 27 1979 12:00AM