DEVELOPMENT OF CLOSED LOOP SECONDARY AIR CONTROL THREE-WAY CATALYST SYSTEM

The three-way catalyst system using a carburetor still needs a lot of improvement for meeting emission standards for U.S. for 1981, California for 1983, and Japanese for 1978. In order to improve air fuel ratio control capability of a carburetor three-way catalyst system, Toyota has developed a closed loop secondary air control system. In this system air fuel ratio is controlled not in the induction but in the exhaust. This paper describes the performance characteristics and an analysis of the system with regards to emission, driveability and fuel economy.

• Supplemental Notes:
  • Prepared for SAE meeting 25-24 February 1980.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Toyoda, T
  • Yamakawa, Y
  • Inoue, T
  • Oishi, K
  • Hattori, K
• Publication Date: 1980-2

Media Info

• Features: References;
• Pagination: 9 p.
• Serial:
  • Society of Automotive Engineers Preprint
  • Publisher: Society of Automotive Engineers (SAE)

Subject/Index Terms

• TRT Terms: Carburetors; Catalysts; Catalytic converters; Exhaust gases; Feedback control; Fuel conservation; Fuels; Internal combustion engines; Loops (Control systems); Performance; Standards; Vehicle power plants
• Old TRIS Terms: Automobile engines
• Subject Areas: Energy; Highways; Vehicles and Equipment; I96: Vehicle Operating Costs;

Filing Info

• Accession Number: 00325220
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: SAE 800399
• Files: TRIS
• Created Date: Apr 15 1981 12:00AM