This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Evaluation of a Colorado Short Vehicle Emission Test (CBH-226) In Predicting Federal Test Procedure (FTP) Failures
Annotation ability available
Sector:
Language:
English
Abstract
Increasingly stringent Federal exhaust emissions standards being applied to new automobiles necessitates an accurate short test to indicate vehicle emission failures for Inspection Maintenance (I/M) Program purposes and to trigger the Emission Control System Warranty provided in Sections 207 (a) and 207 (b) of the Clean Air Act. It was the intent of the Colorado Department of Health to develop a test that would accurately identify excess exhaust emissions and have an acceptable mathematical correlation to the results of the Federal Test Procedure (FTP). In an attempt to decrease the errors of omission exhibited by existing short tests, a short loaded mode, mass emissions test was considered. A basic statistical analysis of the EPA Urban Dynamometer Driving Schedule was performed and a 226 second driving schedule was developed. This driving schedule was entitled the CDH-226.
The CDH-226 has been performed on one hundred seventy six (176) 1981-1984 in-use vehicles at high altitude. The results discussed in this paper are a statistical comparison of the CDH-226 with Federal Test Procedure results. The CDH-226 shows a high positive mathematical correlation to the FTP for hydrocarbons, carbon monoxide and oxides of nitrogen and proves to be an accurate identifier of excess emissions for all three regulated pollutants.
Authors
Topic
Citation
Ragazzi, R., Stokes, J., and Gallagher, G., "An Evaluation of a Colorado Short Vehicle Emission Test (CBH-226) In Predicting Federal Test Procedure (FTP) Failures," SAE Technical Paper 852111, 1985, https://doi.org/10.4271/852111.Also In
References
- Motor Vehicles Emissions Control System Performance Warranty Short Tests Additional Short Tests and Other Amendments USEPA (40 FR 24320) 1984
- Elston, J. “Motor Vehicle Inspection/Maintenance Programs — A Critical Review” JAPCA 31 5 1981
- Hughes, D. W. “Inspection and Maintenance for 1981 and Later Model Year Passenger Cars” SAE, 810830 , Dearborn, MI 1981
- White J. T. III, et al. “Exhaust Emissions From In-Use Passenger Cars Equipped with Three-Way Catalysts,” SAE 800823 , Dearborn, MI 1980
- “Light Duty Vehicle Emission Standards for CO and NO X — A Preliminary Analysis” Draft USEPA Ann Arbor, MI 1981
- U. S. Code of Federal Regulations, Title 40, Part 85, Subpart V Emission Control System Performance Warranty Regulations and Voluntary Aftermarket Part Certification Program. Sections 85.2101 through 85.2111 1983
- U. S. Code of Federal Regulations, Title 40, Part 86, Appendix 1 Urban Dynamometer Schedules 1983
- U. S. Code of Federal Regulations, Title 40, Part 86, Subpart B Emission Regulations for 1977 and Later Model Year Light-Duty and New Light-Duty Trucks; Test Procedures. Sections 86.106-78 through 86.144-78 1983