THE EXHAUST EMISSION AND FUEL CONSUMPTION CHARACTERISTICS OF AN ENGINE DURING WARMUP--A VEHICLE STUDY

Using an 1814-kg vehicle, the effects of air-fuel ratio and spark advance on exhaust emissions and fuel consumption were assessed for the warmup portion of the Federal Test Procedure. Probable causes of differences between cold- and warm-engine emissions and fuel consumption were identified. During warmup, HC and CO emissions were minimum at air-fuel ratios of 14.5 and 16, respectively. Minimum fuel consumption also occurred within this range. Both HC and CO emissions were insensitive to ignition timing, but retarding the timing decreased NOx emissions significantly. Disregarding driveability, a warmup air-fuel ratio of 16 was judged to offer the best emissions/fuel economy tradeoff.

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Pozniak, D J
• Publication Date: 1980-2

Media Info

• Pagination: 16 p.

Subject/Index Terms

• TRT Terms: Carbon monoxide; Exhaust gases; Fuel air mixtures; Fuel consumption; Hydrocarbons; Ignition systems; Nitric oxide; Nitrogen oxides; Vehicle power plants
• Uncontrolled Terms: Air fuel ratio
• Old TRIS Terms: Automobile engines
• Subject Areas: Energy; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00315096
• Record Type: Publication
• Report/Paper Numbers: SAE 800396
• Files: TRIS
• Created Date: Oct 8 1980 12:00AM