TOYOTA EMISSION CONTROL SYSTEMS FOR 1978 JAPANESE EMISSION STANDARDS

Three emission control systems have been developed by Toyota to meet 1978 Japanese standards: a three-way catalyst system, the turbulence generating pot (tgp) with oxidation catalyst, and, a conventional oxidation catalyst system. The three-way catalyst system uses a coating of platinum and rhodium on an aluminium substrate. The system gives high conversion efficiencies for HC, CO and NOx simultaneously in a narrow air-fuel ratio range. The tgp with oxidation catalyst system, which previously met 1976 standards, can only satisfy the 1978 requirements with the addition of egr and an air-fuel ratio set at about 14. During cruising mode egr is cut off and the air: fuel ratio is set at about 16 by an air:fuel ratio control system. The conventional oxidation catalyst system used to meet 1975 and 1976 requirements on engines of 1300 cc was improved by the optimization of air:fuel ratio, ignition timing, egr and secondary air to further reduce NOx emissions. Operating characteristics of the three systems are described. /TRRL/

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  • Corporate Authors:

    Society of Automotive Engineers of Japan

    10-2 Goban-cho, Chiyoda-ku
    Tokyo,   Japan 

    Society of Automotive Engineers of Japan

    10-2 Goban-cho, Chiyoda-ku
    Tokyo,   Japan 

    Society of Automotive Engineers of Japan

    10-2 Goban-cho, Chiyoda-ku
    Tokyo,   Japan 
  • Publication Date: 1978-12-30

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Filing Info

  • Accession Number: 00302581
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Dec 19 1979 12:00AM