LIGHT DUTY VEHICLE AND LIGHT DUTY TRUCK EMISSION PERFORMANCE WARRANTY; SHORT TESTS AND STANDARDS

This report addresses the relationship between short test emission results and emissions as measured on the "complete" or certification test (hydrocarbons and carbon monoxide) for 1981 and later model year light duty vehicles and light duty trucks. As provided in section 207(b) of the Clean Air Act, EPA must establish an Emissions Performance Warranty if a short test can be developed which is (1) available (2) in accordance with good engineering practice and (3) reasonably capable of being correlated with the Federal Test Procedure (FTP). The purpose of this report is to evaluate the correlation of idle and loaded short test emissions to results which will be obtained on the certification test for 1981 model year and later passenger cars and light trucks. This report addresses the issue of correlation for 1981 and later model year vehicles. Data from 1975-77 model federal cars were examined. Three short tests are recommended: idle, two speed idle and two mode loaded. These short tests gave approximately the same error of commission rate as the FTP (comparing single test results to average emission levels) while identifying a substantial part of the excess emissions.

• Corporate Authors:

  Southwest Research Institute

  Inspection and Maintenance Staff
  San Antonio, TX  United States  78284

  Environmental Protection Agency

  Emission Control Technology Division, 2565 Plymounth Road
  Ann Arbor, MI  United States  48105
• Publication Date: 1979-12

Media Info

• Pagination: 27 p.

Subject/Index Terms

• TRT Terms: Automobile industry; Automobiles; Carbon monoxide; Certification; Correlation analysis; Emission control systems; Engine idling; Exhaust gases; Hydrocarbons; Light trucks; Performance tests; Regulations; Standards; Technology assessment; Trucks
• Identifier Terms: Clean Air Act
• Old TRIS Terms: Idling
• Subject Areas: Data and Information Technology; Education and Training; Highways; Law; Motor Carriers; Vehicles and Equipment;

Filing Info

• Accession Number: 00312874
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: EPA-AA-IMS-009/ST-1 Tech Rpt., HS-029 030
• Files: HSL, TRIS
• Created Date: May 7 1984 12:00AM