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Sensing Exhaust NO2 Emissions Using the Mixed Potential Principle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
Annotation ability available
NOx aftertreatment is an essential subsystem to enable diesel and lean gasoline engines to meet emissions regulations. A selective catalytic reduction (SCR) system, which uses urea to create ammonia (NH3) for NOx reduction, is one popular form of NOx aftertreatment system. These urea based NOx aftertreatment systems can benefit from closed-loop control when appropriate NH3, NOx, or NO2 exhaust gas sensors are available. For example, knowing exhaust NO2 emissions after a diesel oxidation catalyst can help the urea dosing strategy to maximize the efficiency of a urea SCR system. Such sensing capability, combined with ammonia sensing, can provide enhanced closed-loop control of the SCR system as well as information for on-board diagnosis.
This paper covers Delphi's progress in developing an exhaust NO2 sensor. Sensor data from a synthetic gas bench and from engine testing is presented for four NO2 sensors, along with investigations into the sensor's sensitivity to a variety of relevant factors such as oxygen concentration, humidity, and operating temperature. Data regarding the sensor's cross-sensitivity to NO and NH3 are also presented, in both gas bench and engine conditions.
CitationWang, D., Racine, D., Husted, H., and Yao, S., "Sensing Exhaust NO2 Emissions Using the Mixed Potential Principle," SAE Technical Paper 2014-01-1487, 2014, https://doi.org/10.4271/2014-01-1487.
- Schär , Onder , Elsener and Geering Model-based Control of an SCR System for Mobile Application F2004V205 Proceedings of World Automotive Congress 2004 Barcelona Spain
- Willems , F. , Cloudt , R. , van den Eijnden , E. , van Genderen , M. et al. Is Closed-Loop SCR Control Required to Meet Future Emission Targets? SAE Technical Paper 2007-01-1574 2007 10.4271/2007-01-1574
- van Helden , R. , Verbeek , R. , Willems , F. , and van der Welle , R. Optimization of Urea SCR deNOx Systems for HD Diesel Engines SAE Technical Paper 2004-01-0154 2004 10.4271/2004-01-0154
- Chi , J. and DaCosta , H. Modeling and Control of a Urea-SCR Aftertreatment System SAE Technical Paper 2005-01-0966 2005 10.4271/2005-01-0966
- Upadhay and Nieuwstad Van Control Design of an Automotive Urea SCR Catalyst Porc. Of ASME: IMECHE 1 8 2002
- Song , Q. and Zhu , G. Model-based Closed-loop Control of Urea SCR Exhaust Aftertreatment System for Diesel Engine SAE Technical Paper 2002-01-0287 2002 10.4271/2002-01-0287
- US Patent 7074319 Ammonia Gas Sensor July 11 2006
- Wang Da Yu , Yao Sheng , Racine David , Cabush David , and Shost Mark Ammonia Sensor for SCR NO x Reduction DEER 2007 http://www1.eere.energy.gov/vehiclesandfuels/resources/proceedings/2007_deer_presentations.html
- Wang , D. , Yao , S. , Shost , M. , Yoo , J. et al. Ammonia Sensor for Closed-Loop SCR Control SAE Int. J. Passeng. Cars - Electron. Electr. Syst. 1 1 323 333 2009 10.4271/2008-01-0919
- Shimizu Youichi Maeda Koji Solid electrolyte NOx using pyrochlore-type oxide electrode Sensors and Actuators B 52 1998 84 89
- Gopel Wolfgang , Reinhardt Gotz , Rosch Martin Trends in the development of solid state amperometric and potentiometric high temperature sensors Solid State Ionics 136 137 2000 519 531
- Bartolomeo Elisabetta Di , Luisaret-Black Maria , Banach U. Hydrogen Sensors - A Review Sensors and Actuators B 157 2011 329 352
- Fujio Yuki , Plashnitsa Vladimir V. , Elumalai Perumal , Miura Norio Stabilization of sensing performance for mixed -potential -type zirconia-based hydrocarbon sensor Talanta 85 2011 575 581