TEST VARIABILITY OF EMISSION AND FUEL ECONOMY MEASUREMENTS USING THE 1975 FEDERAL TEST PROCEDURE

Several sets of repetitive test data using the 1975 Federal Test Procedure ('75 FTP) have been analyzed to establish the variability of each component measured during each phase of the test. The variability characteristics of four different emission control systems have been discussed and compared. The over variabilities of the '75 FTP composite values have been assessed at plus-minus 6% for hydrocarbons and CO, plus-minus 3% for NOX, and plus-minus 1% for CO2. The extremely repeatable behavior of the CO2 emissions is utilized to calculate the fuel economy during the test. This calculation is discussed and some fuel economy results from repetitive tests are presented.

• Corporate Authors:

  Society of Automotive Engineers

  485 Lexington Avenue
  New York, NY  United States  10017
• Authors:
  • Paulsell, C D
  • Kruse, R E
• Publication Date: 1974-10

Media Info

• Pagination: 20 p.

Subject/Index Terms

• TRT Terms: Automotive engineering; Emission control systems; Energy; Fuel consumption; Pollutants; Testing; Variables
• Subject Areas: Energy; Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00084969
• Record Type: Publication
• Report/Paper Numbers: SAE Paper #741035
• Files: TRIS
• Created Date: May 1 1975 12:00AM