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The Effect of Restorative Maintenance on the Relationship Between Short Test and Federal Test Procedure Emission Test Results
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Abstract
The Restorative Maintenance Program conducted by the Environment Protection Agency in late 1976 and early 1977 provides short test and Federal Test Procedure data on a large fleet of relatively new consumer owned automobiles. The program included testing of 300 vehicles in Chicago, Detroit and Washington, D.C. The vehicles that indicated a need for maintenance were repaired and retested by the FTP and the five short tests being considered by the agency for the Federal warranty regulations.
These data are examined by conventional regression and correlation methods, contingency table analysis and maintenance effectiveness criteria.
The conclusions of the study indicate that while the mathematical correlation coefficients are quite low for most of the tests, all five tests are effective in identifying vehicles in need of maintenance and significant hydrocarbon and carbon monoxide emissions reductions can be achieved at relative low vehicle failure rates. The transient mode tests are also effective in identifying oxides of nitrogen reduction potentials.
Authors
Citation
Davis, D., "The Effect of Restorative Maintenance on the Relationship Between Short Test and Federal Test Procedure Emission Test Results," SAE Technical Paper 780619, 1978, https://doi.org/10.4271/780619.Also In
References
- Williams M. E. et. al. “Automobile Exhaust Emission Surveillance - Analysis of the FY72 Program.” EPA Report No. 460/2-74-001 February 1974
- Bernard J. et. al. “Automobile Exhaust Emission Surveillance - Analysis of FY73 Program.” EPA Report No. 460/3-75-007 July 1975
- Berens A. P. Hill M. “Automobile Exhaust Emission Surveillance - Analysis of the FY74 Program.” EPA Report No. 460/3-76-019 September 1976
- Rutherford J. “Automobile Exhaust Emission Surveillance - Analysis of the FY75 Program.” EPA Report No. 460/3-77-022 January 1978
- Liljedahl D. Terry J. “Evaluation of Restorative Maintenance on 1975 and 1976 Light-Duty Vehicles in Chicago, Illinois.” January 1977
- Washington L. H. “Evaluation of Restorative Maintenance on 1975 and 1976 Light-Duty Vehicles in Washington, D. C..” March 1977
- Gafford R. Carlson R. “Evaluation of Restorative Maintenance on 1975 and 1976 Light-Duty Vehicles in Detroit, Michigan.” May 1977
- Hinton M. G. Meltzer J. “Federal Test Procedure and Short Test Correlation Analysis.” April 1976