Evaluation of Solid Particle Number Sensors for Periodic Technical Inspection of Passenger Cars

Following the increase in stringency of the European regulation limits for laboratory and real world automotive emissions, one of the main transport related aspects to improve the air quality is the mass scale in-use vehicle testing. Solid particle number (SPN) emissions have been drastically reduced with the use of diesel and gasoline particulate filters which, however, may get damaged or even been tampered. The feasibility of on-board monitoring and remote sensing as well as of the current periodical technical inspection (PTI) for detecting malfunctioning or tampered particulate filters is under discussion. A promising methodology for detecting high emitters is SPN testing at low idling during PTI. Several European countries plan to introduce this method for diesel vehicles and the European Commission (EC) will provide some guidelines. For this scope an experimental campaign was organized by the Joint Research Centre (JRC) of the EC with the participation of different instrument manufacturers. Idle SPN concentrations of vehicles without or with a malfunctioning particulate filter were measured. The presence of particles under the current cut-off size of 23 nm as well as of volatile particles during idling are presented. Moreover, the extreme case of a well performing vehicle tested after a filter regeneration is studied. In most of the cases the different sensors used were in good agreement, the high sub-23 nm particles existence being the most challenging case due to the differences in the sensors’ efficiency below the cut-off size.

[1]  G. Martini,et al.  Particle number measurements in the European legislation and future JRC activities , 2018, Combustion Engines.

[2]  G. Martini,et al.  Non-Volatile Particle Number Emission Measurements with Catalytic Strippers: A Review , 2020, Vehicles.

[3]  David C. Carslaw,et al.  New insights from comprehensive on-road measurements of NOx, NO2 and NH3 from vehicle emission remote sensing in London, UK , 2013 .

[4]  Heinz Burtscher,et al.  Aerosol Measurement by Induced Currents , 2014 .

[5]  H. Burtscher.  Physical characterization of particulate emissions from diesel engines: a review , 2005 .

[6]  T. Boger,et al.  Next Generation Gasoline Particulate Filters for Uncatalyzed Applications and Lowest Particulate Emissions , 2021 .

[7]  A. Bergmann,et al.  Particle number measurements within periodic technical inspections: A first quantitative assessment of the influence of size distributions and the fleet emission reduction , 2020 .

[8]  Jian Wang,et al.  Fast Mixing Condensation Nucleus Counter: Application to Rapid Scanning Differential Mobility Analyzer Measurements , 2002 .

[9]  Martin Mohr,et al.  Separation of volatile and non-volatile aerosol fractions by thermodesorption: instrumental development and applications , 2001 .

[10]  Barouch Giechaskiel,et al.  Effect of selective catalytic reduction on exhaust nonvolatile particle emissions of Euro VI heavy-duty compression ignition vehicles , 2019, Aerosol Science and Technology.

[11]  J. Andersson,et al.  Measurement of Automotive Nonvolatile Particle Number Emissions within the European Legislative Framework: A Review , 2012 .

[12]  Barouch Giechaskiel,et al.  Comparisons of Laboratory and On-Road Type-Approval Cycles with Idling Emissions. Implications for Periodical Technical Inspection (PTI) Sensors , 2020, Sensors.

[13]  G. Carsten,et al.  Potential of Remote Sensing Devices (RSDs) to screen vehicle emissions , 2019 .

[14]  Karl Ropkins,et al.  Evaluation of EDAR vehicle emissions remote sensing technology. , 2017, The Science of the total environment.

[15]  K. Nickel,et al.  Mechanisms and orientation dependence of the corrosion of single crystal Cordierite by model diesel particulate ashes , 2010 .

[16]  M. Blangiardo,et al.  A tale of two cities: is air pollution improving in Paris and London? , 2019, Environmental pollution.

[17]  Leonidas Ntziachristos,et al.  Evaluation of an oxidation catalyst (“catalytic stripper”) in eliminating volatile material from combustion aerosol , 2013 .

[18]  G. Kadijk,et al.  Investigation into a periodic technical inpsection test method to check for presence and proper functioning of diesel particulate filters in light-duty diesel vehicles , 2016 .

[19]  A. De Filippo,et al.  Diesel nucleation mode particles: semivolatile or solid? , 2008, Environmental science & technology.

[20]  H. Sakurai,et al.  Application of the PMP methodology to the measurement of sub-23 nm solid particles: Calibration procedures, experimental uncertainties, and data correction methods , 2015 .

[21]  Barouch Giechaskiel,et al.  Particle Number Measurements Directly from the Tailpipe for Type Approval of Heavy-Duty Engines , 2019, Applied Sciences.

[22]  M. Kostoglou,et al.  Fundamental Studies of Diesel Particulate Filters: Transient Loading, Regeneration and Aging , 2000 .

[23]  B. Giechaskiel,et al.  Calibration Uncertainty of 23nm Engine Exhaust Condensation Particle Counters with Soot Generators: a European Automotive Laboratory Comparison , 2021, Emission Control Science and Technology.

[24]  W. A. Cutler,et al.  Thermal Durability of Wall-Flow Ceramic Diesel Particulate Filters , 2001 .

[25]  Ye Wu,et al.  On-board monitoring (OBM) for heavy-duty vehicle emissions in China: Regulations, early-stage evaluation and policy recommendations. , 2020, The Science of the total environment.

[26]  U. Matter,et al.  Particulate Traps for Retro-Fitting Construction Site Engines VERT: Final Measurements and Implementation , 1999 .

[27]  A. Bergmann,et al.  High-temperature condensation particle counter using a systematically selected dedicated working fluid for automotive applications , 2020 .

[28]  J. Andersson,et al.  Particle Number Emissions of a Euro 6d-Temp Gasoline Vehicle under Extreme Temperatures and Driving Conditions , 2021, Catalysts.

[29]  M. Fierz,et al.  Design Principles for Sensing Particle Number Concentration and Mean Particle Size With Unipolar Diffusion Charging , 2019, IEEE Sensors Journal.

[30]  C. Sioutas,et al.  Assessment of air quality in car cabin in and around Paris from on-board measurements and comparison with 2007 data , 2021 .

[31]  Barouch Giechaskiel,et al.  Calibration of Condensation Particle Counters for Legislated Vehicle Number Emission Measurements , 2009 .

[32]  H. Burtscher,et al.  A New Periodic Technical Inspection for Particle Emissions of Vehicles , 2019, Emission Control Science and Technology.

[33]  Leonidas Ntziachristos,et al.  Impact of selective catalytic reduction on exhaust particle formation over excess ammonia events. , 2014, Environmental science & technology.

[34]  B. Giechaskiel.  Particle Number Emissions of a Diesel Vehicle during and between Regeneration Events , 2020, Catalysts.

[35]  R. Burnett,et al.  Lung cancer, cardiopulmonary mortality, and long-term exposure to fine particulate air pollution. , 2002, JAMA.

[36]  Kun Yang,et al.  Characterizing Diesel Particulate Filter Failure During Commercial Fleet Use due to Pinholes, Melting, Cracking, and Fouling , 2016, Emission Control Science and Technology.

[37]  D. Kittelson,et al.  Real time measurement of volatile and solid exhaust particles using a catalytic stripper , 1995 .

[38]  L. Ntziachristos,et al.  Application of the dual Pegasor Particle Sensor to real-time measurement of motor vehicle exhaust PM , 2017 .

[39]  Barouch Giechaskiel,et al.  Theoretical Investigation of Volatile Removal Efficiency of Particle Number Measurement Systems , 2010 .

[40]  L. Ntziachristos,et al.  European Regulatory Framework and Particulate Matter Emissions of Gasoline Light-Duty Vehicles: A Review , 2019, Catalysts.

[41]  L. Ntziachristos,et al.  Review of motor vehicle particulate emissions sampling and measurement: From smoke and filter mass to particle number , 2014 .

[42]  H. Yamada.  Improving Methodology of Particulate Measurement in Periodic Technical Inspection with High-Sensitivity Techniques: Laser Light Scattering Photometry and Particle Number Method , 2019, Emission Control Science and Technology.

[43]  B. Giechaskiel,et al.  Regulating particle number measurements from the tailpipe of light-duty vehicles: The next step? , 2019, Environmental research.

[44]  Design principles for diffusion chargers sensing particle number concentration , 2016, 2016 IEEE SENSORS.

[45]  B. Giechaskiel,et al.  Uncertainty of laboratory and portable solid particle number systems for regulatory measurements of vehicle emissions , 2021, Environmental research.

[46]  Development and evaluation of a catalytic stripper for the measurement of solid ultrafine particle emissions from internal combustion engines , 2020 .

[47]  Verifying the Efficiency of a Diesel Particulate Filter Using Particle Counters with Two Different Measurements in Periodic Technical Inspection of Vehicles , 2021, Energies.