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Engine Emissions

Engine EmissionsOn the road or in the laboratory, TSI particle instruments are helping us to understand and quantify vehicle emissions. These instruments are used in the research and development of better engines and after-treatment systems, like Diesel-Particulate Filters (DPF) or Gasoline Particulate Filters (GPF).

Our particle counters measure the number concentration of aerosol particles in engine emissions, and our particle sizers add insight into the size of the exhaust particles. Measurements can be done at the tailpipe or from the Constant Volume Sampler (CVS) or other partial flow samplers. High time resolution mass measurements of engine exhaust particles are also possible; contact TSI to learn more.

Real-World Emissions

The standard tool to assess emission levels for construction machinery, buses, and other vehicles under realistic use conditions is the Nanoparticle Emission Tester (NPET). It offers a free-measurement mode to enable continuous measurements, but also has a test cycle compliant to the non-road mobile machinery (NRMM) testing defined by the Swiss regulation 941.242. The High-Concentration NPET was designed to measure upstream and downstream of Diesel or Gasoline Particle Filters, cold start emissions or biomass combustion emissions beyond the Swiss regulation.

The NPET has been used during driving tests, but also is a quick tool to test operation of after-treatment systems. As after-treatment systems age, small leaks could occur due to stress well before warranty expiration. The sensitivity of the NPET means it is capable of detecting elevated number concentrations caused by those leaks. This allows repairs to be made before costly replacements are necessary.

Researchers also have been driving and flying our counters and sizers to assess particle concentrations and sizes on freeways, urban streets, and from ships and airplanes.

Development & research

Engine application developers, DPF manufacturers and other automotive engineers rely on particle size and count data to design low-emission vehicles.

TSI’s particle counter was the standard reference during the development of the Particle Measurement Programme (PMP). The successor Engine Exhaust Condensation Particle Counter (EECPC) 3790A detects nanoparticles as mandated by Euro 5b / Euro 6 regulation, and is often combined with a diluter and a volatile particle remover for making PMP-compliant emissions measurements.

Adding the Engine Exhaust Particle Sizer (EEPS) 3090 provides time-resolved particle size spectra. After-treatment filters have particle retention performance that varies by particle size. Insight into particle size allows researchers to optimize engine conditions and injection technologies in order to boost compliance with stringent emission regulations.

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