This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Measurement of Brake-specific NOX Emissions using Zirconia Sensors for In-use, On-board Heavy-duty Vehicle Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 06, 2002 by SAE International in United States
Annotation ability available
Emissions tests for heavy -duty diesel-fueled engines and vehicles are normally performed using engine dynamometers and chassis dynamometers, respectively, with laboratory grade gaseous concentration measurement analyzers and supporting test equipment. However, a considerable effort has been recently expended on developing in-use, on-board tools to measure brake-specific emissions from heavy -duty vehicles with the highest degree of accuracy and precision. This alternative testing methodology would supplement the emissions data that is collected from engine and chassis dynamometer tests. The on-board emissions testing methodology entails actively recording emissions and vehicle operating parameters (engine speed and load, vehicle speed etc.) from vehicles while they are operating on the road. This paper focuses on in-use measurements of NOX with zirconium oxide sensors and other portable NOX detectors.
A zirconia sensor along with a NOX converter was used in the MEMS for the measurement of NOX, with an electrochemical NO cell as a QC/QA device. Brake-specific mass emissions of NOX were reported by the MEMS within 5% of laboratory results integrated over an FTP cycle in an engine test cell. While the zirconium sensor had T90 response times of 5 seconds or less, yielded accurate measurement and had no detectable effects from vibration or orientation bias, it did not provide a 100% response to NO2. Consequently, a NOX converter was employed to convert NO2 to NO in order to obtain a NOX measurement. The NOX converter was placed upstream of a thermoelectric chiller to prevent loss of the water-soluble NO2 before being converted to NO. NOX concentrations may be measured more accurately by improving the conversion efficiency of the NOX converter. The NOX converter efficiency was found to decrease as NO2 concentration increased. Thus, the percentage of NO2 measured depends on engine operating conditions. Durability tests were not conducted on the zirconia sensors as part of this program. This paper presents results from an extensive evaluation of the zirconia sensor for NOX emissions measurements.
- Mridul Gautam - West Virginia University, Department of Mechanical and Aerospace Engineering
- Wesley C. Riddle - West Virginia University, Department of Mechanical and Aerospace Engineering
- Gregory J. Thompson - West Virginia University, Department of Mechanical and Aerospace Engineering
- Daniel K. Carder - West Virginia University, Department of Mechanical and Aerospace Engineering
- Nigel Clark - West Virginia University, Department of Mechanical and Aerospace Engineering
- Donald W. Lyons - West Virginia University, Department of Mechanical and Aerospace Engineering
CitationGautam, M., Riddle, W., Thompson, G., Carder, D. et al., "Measurement of Brake-specific NOX Emissions using Zirconia Sensors for In-use, On-board Heavy-duty Vehicle Applications," SAE Technical Paper 2002-01-1755, 2002, https://doi.org/10.4271/2002-01-1755.
SAE 2002 Transactions Journal of Fuels and Lubricants
Number: V111-4; Published: 2003-09-15
Number: V111-4; Published: 2003-09-15
- Gautam, M. Clark, N. N. Thompson, G. J. Carder, D. K. Lyons, D. W. “Evaluation of Mobile Monitoring Technologies for Heavy -Duty Diesel-Powered Vehicle Emissions,” Department of Mechanical and Aerospace Engineering, West Virginia University Morgantown, WV 2000 http://es.epa.gov/oeca/ore/aed/diesel/phasei.pdf http://es.epa.gov/oeca/ore/aed/diesel/phaseii.pdf
- Gautam, M. Thompson, G.J. Carder, D.K. Clark, N.N. Shade, B.C. Riddle, W.C. Lyons, D.W. “Measurement of In-use, On-board Emissions from Heavy -duty Diesel Vehicles: Mobile Emissions Measurement System” SAE Paper No. 2001-01-3643 2001
- Instruction Manual - MEXA-120 NO X Analyzer Horiba, Ltd. First September 1998 Kyoto, Japan
- Jahnke, J. A. Continuous Emission Monitoring Van Nostrand Reinhold New York 1993
- Installation Manual - Horiba Model BE-220 NO Analyzer Horiba, Ltd. First June 30 1997 Kyoto, Japan
- AMBII Hardware Interface, Version 1.00 Sensors, Inc. Saline MI, USA 1999
- Nitric Oxide Sensor - Operating Instructions City Technology Ltd Portsmouth, UK 1999
- Shigley, J. E. Mischke, C. R. Mechanical Engineering Design Fifth McGraw-Hill, Inc. New York 1989
- Gautam, M. Miller, E.S. Ferguson, D.H. Lyons, D.W. 1998 “Uncertainty in Real-World Particulate Matter Emission Measurements from a Transportable Heavy Duty Vehicle Emissions Testing Laboratory” International Journal of Vehicle Design 5 3 4 1998