The Effect of Restorative Maintenance on the Relationship Between Short Test and Federal Test Procedure Emission Test Results

780619

02/01/1978

Event
Passenger Car Meeting & Exposition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/780619
Pages
20
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.
Additional Details
Publisher
Published
Feb 1, 1978
Product Code
780619
Content Type
Technical Paper
Language
English