This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Variability of Heavy-Duty Diesel Engine Emissions for Transient and 13-Mode Steady-State Test Methods
Annotation ability available
Sector:
Language:
English
Abstract
The variability of heavy-duty diesel engine emissions was determined during a cooperative test program by the Engine Manufacturers Association and the Environmental Protection Agency. Six heavy-duty diesel engines with rated power ranging from 150 kW to 280 kW were evaluated to determine the nitrogen oxide, hydrocarbon and particulate emissions variability's within and among laboratories. Tests were performed using the recently adopted heavy duty diesel engine transient cycle and the 13-mode steady-state method which was used for certification until the 1984 model year. Transient and 13-mode test variability's were nearly the same for nitrogen oxides and particulates however hydrocarbon variability's were greater for transient than for 13-mode tests. The variances among different laboratories were greater than within individual laboratories by a factor of about two, except when several months of testing elapsed, in which case the variability within a laboratory was nearly the same as among-laboratories.
Comparisons of variances and regulations indicated that nitrogen oxide and hydrocarbon variability's were about 25% of the regulated emission values. The corresponding particulate variability was 76% of the proposed regulation which suggests that particulate control presents a significant challenge.
Recommended Content
Authors
Topic
Citation
Barsic, N., "Variability of Heavy-Duty Diesel Engine Emissions for Transient and 13-Mode Steady-State Test Methods," SAE Technical Paper 840346, 1984, https://doi.org/10.4271/840346.Also In
Diesel Exhaust Emissions-Particulate Studies and Transient Cycle Testing
Number: SP-0578; Published: 1984-08-01
Number: SP-0578; Published: 1984-08-01
References
- Code of Federal Regulations, Title 40, Protection of Environment, Chapter I - Environmental Protection Agency Part 86, Subpart N - Emission Regulations for New Gasoline-Fueled and Diesel Heavy-Duty Engines; Gaseous Exhaust Test Procedures
- Code of Federal Regulations, Title 40, Protection of Environment, Chapter I - Environmental Protection Agency Part 86, Subpart D - Emission Regulations for New Gasoline Fueled and Diesel Heavy-Duty Engines
- Federal Register, Wednesday, 7 January 1981, Part III - Environmental Protection Agency, Control of Air Pollution from New Motor Vehicles and New Motor Vehicle Engines Particulate Regulation for Heavy-Duty Diesel Engines
- “Standard Practice for Dealing with Outlying Observations” American Society for Testing Materials (ASTM) 1980 206 231
- Statistical Design and Analysis of Engineering Experiments Lipson C. Sheth N. J. 1972 McGraw-Hill New York
- Applied Linear Statistical Models - Regression, Analysis of Variance and Experimental Design Neter J. Wasserman W. 1974 Richard D. Irwin, Inc. Homewood, Illinois 60430
- Design of Experiments, A Realistic Approach Anderson V. L. McLean R. A. 1972 Marcel Dekker, Inc. New York
- Statistics in Research Second Ostle B. 1969 Iowa State University Press Ames, Iowa
- “Extension of Multiple Range Tests to Group Means with Unequal Numbers of Replications” Kramer C. Y. Biometrics 12 307 310 1956
- “t-Tests and Intervals for Comparisons Suggested by the Data” Duncan D. B. Biometrics 31 339 359 1975
- Statistical Analysis System (SAS) Users Guide 1979 191 194 SAS Institute Inc. Cary, NC 27511
- “Status of Diesel Particulate Measurement Methods” MacDonald J. S. et. al. SAE Paper 1984