1972-02-01

Toyota Status Report on Low Emission Concept Vehicles 720487

The status of Toyota's development of low emission concept packages-
  1. 1.
    NOx and HC/CO Catalytic Converter and EGR,
  2. 2.
    Thermal Reactor, NOx and HC/CO Catalytic Converter and EGR and their components is described.
  • Variations of thermal reactor design, performance and durability characteristics are discussed.
  • Above the throttle valve entry EGR has been found to have desirable flow characteristics with a simple control system.
  • EGR rate over 15% brings about unacceptably poor driveability and fuel economy with smaller vehicles.
  • Many types of catalytic converters for pelleted catalysts have been designed and examined for their performance and durability. A down-flow type converter has relatively good flow distribution and warm-up characteristics.
  • As for HC and CO, a few prototype vehicles have met the 1975 Federal Regulation at low mileage, but the 1976 regulation for NOx of 0.4 gm./mi. is very difficult to meet even with a significant penalty in driveability and economy for our smaller vehicles.

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