This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Measuring Near Zero Automotive Exhaust Emissions - Zero Is a Very Small Precise Number
Technical Paper
2010-01-1301
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In the environmentally conscious world we live in, auto manufacturers are under extreme pressure to reduce tailpipe emissions from cars and trucks. The manufacturers have responded by creating clean-burning engines and exhaust treatments that mainly produce CO2 and water vapor along with trace emissions of pollutants such as CO, THC, NOx, and CH4. The trace emissions are regulated by law, and testing must be performed to show that they are below a certain level for the vehicle to be classified as road legal. Modern engine and pollution control technology has moved so quickly toward zero pollutant emissions that the testing technology is no longer able to accurately measure the trace levels of pollutants. Negative emission values are often measured for some pollutants, as shown by results from eight laboratories independently testing the same SULEV automobile. The negative emission values are shown to be caused by actual values that are very near zero, physically imperfect testing equipment and practical testing issues.
Recommended Content
| Technical Paper | Research on HC Adsorption Emission System |
| Technical Paper | An ISO 8178 Correlation Study Between Raw and Dilute Exhaust Emission Sampling Systems |
| Technical Paper | Constant Volume Sampling System Water Condensation |
Authors
Topic
Citation
Thiel, W., Woegerbauer, R., and Eason, D., "Measuring Near Zero Automotive Exhaust Emissions - Zero Is a Very Small Precise Number," SAE Technical Paper 2010-01-1301, 2010, https://doi.org/10.4271/2010-01-1301.Also In
References
- Krough, B. “Negative Numbers Report,”
- California Air Resources, California Non-Methane Organic Gas Test Procedures July 30 2002
- Letter to Manufacturers, CCD-01-01 US EPA February 8 2001
- Thiel, W. Hartmann, K. “Possible Influences on Fuel Consumption Calculations While Using the Hydrogen-Balance Method,” SAE Technical Paper 2008-01-1037 2008
- Garthe, C. Ballik, R. Hornreich, C. Thiel, W. “HC Measurements by Means of Flame Ionization: Background and Limits of Low Emission Measurement,” SAE Technical Paper 2003-01-0387 2003
- Sun, E. McMahon, W. Peterson, D. Wong, J. Stenerson, E. “Evaluation of an Enhanced Constant Volume Sampling System and a Bag Mini Diluter for Near Zero Exhaust Emission Testing,” SAE Technical Paper 2005-01-0684 2005
- Baronick, J.D. et al. “Final Report on the Research Project: Improving the Method of Hydrocarbon Analysis,” Volkswagen AG Research and Development 1980
- Wallner, T et al. “Fuel economy and emissions evaluation of BMW Hydrogen 7 Mono-Fuel demonstration Vehicles,” International Journal of Hydrogen Energy 2008 10.1016/j.ijhydene.2008.08.067
- Manufacturers Advisory Correspondence, MAC #2002-02 California Air Resources Board May 14 2002
- Letter to Manufacturers, CCD-01-23 US EPA December 6 2001
- Nevius, T. Porter, S. Rooney, R. Rauker, D. “Techniques for Improved Correlation Between Constant Volume and Partial Flow Sample Systems,” SAE Technical Paper 2009-01-1351 2009
- U.S. Code of Federal Regulations “Analytical Gases,” July 2008
- U.S. Code of Federal Regulations “Hydrocarbon Analyzer Calibration,” July 2008