Particle Science & Technology
Office of Automotive Engineering



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image of barchart of particle number emissions

Projected solid particle number emissions show comparisons between conventional gasoline engines and GDI engines, and highway diesel engines with and without exhaust particle filters.

Related Article

image of Particle Emissions from Direct Injection Gasoline Engines online article

Summer 2011 issue of Technology Today

Measuring and characterizing fine, ultrafine, and nanoparticle emissions from engines is an ongoing function at Southwest Research Institute (SwRI). SwRI is a pioneer in automotive emission research and assists industry and government in developing and evaluating technologies to meet present and future standards.

Engineers routinely conduct detailed assessments of total particulate emission and characterize particle size and number in traditional diesel and gasoline engines, GDI, hand-held engine technology, and alternative fuel engines including natural gas, propane and bio fuels. SwRI's team of experts in particulate emission measurement offers clients a broad range of capabilities for understanding and measuring exhaust particulate mass, number, and size distributions in ranges of:

  • Fine particles, < 2,500 nm (2.5 μm)
  • Ultrafine particles, < 100 nm (0.1 μm)
  • Nanoparticles, < 50 nm (0.05 μm)

In addition to filter-based measurement of total particulate mass emissions that conforms to the latest USCFR Part 1065 particulate mass and EU solid particle number sampling protocols, SwRI operates a suite of particle measurement instruments to cover a wide range of particle diameters from 3 to 18,000 nm. Fine, ultrafine, and nanoparticle research activities include:

  • Particle sensor development for onboard engine applications and on-board diagnostics
  • Fuel and oil droplet generation and analysis to improve engine particle emissions
  • Soot and ash in oil quantification of ultrafine particles using novel techniques
  • Particle instrument evaluation and calibration
  • Dilution systems evaluation and calibration
  • Development of procedures and protocols for particle measurement
  • Fundamental studies on the different nature of soot particles
  • Theoretical particle loss analysis
  • Modeling particle and fluid dynamics in various systems
  • Consulting services

Additional information is available on the following topics:

Related Terminology

fine  •  nanoparticle  •  number  •  particle measurement  •  particle science  •  particle size  •  particulate  •  particulate mass  •  size distribution  •  ultrafine  •  black carbon  •  emission

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 10 technical divisions.
05/14/14