A GUARD SYSTEM TO LIMIT CATALYTIC CONVERTER TEMPERATURE

High-temperature sintering can cause loss of activity in the catalyst of an automotive emission control system. The elevated temperature required to sinter the catalyst could arise from a combination of a warmed-up converter plus unusually high engine-out carbon monoxide or unburned hydrocarbon "fuel". Such abnormal "fuel" input to the converter has been prevented in all 1975 General Motors production vehicles. In tests with a bead-bed and a guard system installed on a 1974 pre-converter vehicle, maximum bead-bed temperature during closed-throttle coasts was lowered significantly, with no penalty in emissions on the 1975 Federal Test Procedure. However, the reliability of the guard system is limited by deterioration of the very small monoliths. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Mondt, J R
• Publication Date: 1976-2

Media Info

• Pagination: 5 p.

Subject/Index Terms

• TRT Terms: Air quality management; Carbon monoxide; Catalytic converters; Exhaust gases; Hydrocarbons; Sintering; Temperature
• Old TRIS Terms: Exhaust emission control
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00145255
• Record Type: Publication
• Report/Paper Numbers: SAE 760320
• Files: TRIS
• Created Date: May 31 1977 12:00AM