Browse Publications Technical Papers 2005-24-015
2005-09-11

Measurements of Ultrafine Particle Number Emissions from a Light-Duty Diesel Engine Using SMPS, DMS, ELPI and EEPS 2005-24-015

Tightening of automotive particulate matter (PM) emission regulations, driven by health concerns over ultrafine (< 100 nm) and nano-sized (< 50 nm) particles, has focused attention on measurement of particle size and number at the tailpipes of diesel engines. This study presents an investigation of PM emissions by number from a Light-Duty Diesel Engine running on low sulphur fuel using different after-treatment systems. PM measurements by number and size were conducted over both transient and steady-state engine conditions using a standard CVS dilution tunnel.
A Scanning Mobility Particle Sizer (SMPS), Electrical Low Pressure Impactor (ELPI), Differential Mobility Spectrometer (DMS) and an Engine Exhaust Particle Sizer (EEPS) were used for PM measurements. The performance of each particle size measurement instrument was assessed, and a comparison provided at similar experimental conditions.
A standard diesel oxidation catalyst and particulate filters were used as after-treatment systems. Particle number emissions for each are compared.

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