Title: Particle Measurement Programme (PMP) Light Duty Inter-laboratory Exercise: Final Results
Citation: Proceedings of the 11th ETH Conference on Combustion Generated Nanoparticles p. 17
Publisher: Eidgenossische Technische Hochschule Zurich
Publication Year: 2007
JRC N°: JRC38094
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC38094
Type: Articles in periodicals and books
Abstract: The Light Duty Inter-Laboratory Correlation Exercise organised and supervised the testing at 9 test laboratories in the EU, Korea and Japan in order to demonstrate the practicality, robustness, repeatability and reproducibility of the particle emissions measurement techniques proposed by the Particle Measurement Programme (PMP). The exercise involved testing 16 light duty vehicles including 6 diesels equipped with wall-flow Diesel Particulate Filters (DPFs), 6 conventional diesel vehicles, 3 direct injection gasoline vehicles and one conventional, multi-point injection gasoline vehicle. A DPF equipped Peugeot 407 (Golden vehicle) was tested at all participating laboratories to allow the inter-laboratory reproducibility of measurements to be assessed. Measurements of solid particle number emissions, particulate mass and regulated gaseous emissions were taken over each test. In addition to particle number measurements made with a Golden System circulated between laboratories, particle number measurements were made with several alternative systems to compare the performance of different measurement systems. Mean particle number emissions for DPF equipped diesels were less than 2x10^11 particles/km, with repeatability ranging around 30% (expressed as coefficients of variance). One DPF equipped diesel did give higher mean results of around 6x10^11 particles/km. This vehicle differed from the other DPF equipped vehicles in being fitted with a more porous cordierite DPF substrate than the more commonly used silicon carbide DPF substrates. Conventional diesel vehicles gave particle number emissions of around 5x10^13 particles/km. Direct-injection gasoline vehicles mean particle number emissions were in the range 3x10^12 to 1x10^13 particles/km. The conventional, multi-point injection gasoline vehicle tested gave particle number emissions similar to the DPF equipped diesels. Particulate mass measurements of DPF equipped diesel vehicles were consistently below 1mg/km, with a mean typically around 0.57 mg/km and repeatability of 26% or less (expressed as coefficient of variance). Conventional diesel vehicles gave mean particulate mass results in the range 11-40 mg/km. Direct-injection gasoline vehicles varied from 2-13.5 mg/km mean particulate emissions, whilst the conventional multi-point injection gasoline vehicle gave mean emissions similar to the DPF equipped diesels. Reproducibility of the measurement was assessed by testing a single DPF equipped ‘Golden Vehicle’ in all laboratories. This gave an all-labs particle number mean of ~8x10^10 particles/km and mass mean of ~0.34 mg/km with a reproducibility of 31% and 35% respectively. Both measurement techniques were capable of distinguishing between the conventional and DPF equipped diesel vehicles included in this exercise. In addition both were capable of distinguishing lean burn direct injection gasoline vehicles from conventional gasoline vehicles. However particulate mass proved incapable of distinguishing between high and low porosity substrates on DPF equipped diesels or identifying changes in DPF fill state.
JRC Directorate:Sustainable Resources

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