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5.1 Particle Measurement Programme (PMP)

Der folgende Text beschreibt das Mandat, die Vorgehensweise und den urspruenglichen Zeitplan der PMPGruppe vom Mai 2001:
„ECEGRPE PARTICLE MEASUREMENT PROGRAMME (PMP), GRPE 42nd , 29 May – 1 June 2001 The GRPE Particulate Measurement Programme (PMP) is a collaborative programme operating under the auspices of the UNECE WP29/GRPE Group. Its focus is on the development of a new approach to the measurement of particles in vehicle exhaust emissions, which may be used to replace or to complement the existing regulated mass based system.
In this context “ system” comprises a description of the test procedures, sampling equipment and measurement instrumentation.
To assist in the setting of future limit values for lightduty vehicles and heavyduty engines, the programme will provide data on the emissions of particles from engines employing a range of advanced technologies, and in particular from different diesel particle filters (DPF), measured using the new PMP recommended test system.
PMP is open to contributions from governments, industry and NGOs who are members of the GRPE.
Literature reviews reporting studies on the health effects and assessing instrumentation, analytical methodologies and the future of particle measurements will be undertaken under several national programmes. The relative importance of particle mass, size, number, surface area, and chemical composition on human health is yet to be decided.
Based on an initial literature study the programme will be divided into the following elements:
Phase I development of candidate systems Phase II testing programme and validation of systems Phase III characterisation of advanced technology TIMESCALE The programme began in March 2001 and will end in March 2003. It is the intended to:
transmit a formal proposal for a test system(s) to the UNECE in October 2002 for discussion at the January 2003 meeting of GRPE deliver preliminary data on emission levels from advanced technology to the UNECE in December 2002 for discussion at GRPE deliver final data on emission levels from advanced technology to the UNECE in March 2003 for discussion at GRPE.„Zum Zeitpunkt dieses Berichtes (Juni 2003) war die Phase II des Projektes weitgehend abgeschlossen und es zeichnete sich ab, zu welchem Ergebnis und zu welchen konkreten Vorschlaegen die Arbeitsgruppe kommen wuerde. In einem Zwischenbericht zur GRPE im Mai 2003 wurde der Arbeitsstand wie folgt dargestellt:
“ The measurement system evaluation phases of Phases I and II of the government sponsored measurement programmes are now drawing to a conclusion, with potential systems worthy of further evaluation in a round robin test identified. The work on thermodesorbers outlined in the report to the last GRPE session in January 2003 is now in its final stages. …………..
All of the individual reports from the national programmes are nearing completion and work is currently underway on the compilation of a summary report that draws together overall conclusions and recommendations. This will be finalised in the next few weeks once all its constituent reports are completed. The sponsoring Governments will agree its conclusions and recommendations jointly. …..
The large number of measurement systems assessed within the government sponsored programmes makes it difficult to summarise all the results succinctly. Therefore this progress report focuses on the results from those candidate systems that offer some potential, based on the available results. The final results will be presented in the report of the national programmes in the coming weeks.
The main national programmes came to similar conclusions regarding the best performing measurement systems.……
Improvements to the filter method, adopting some of the requirements in the US procedure for heavy duty engines, has improved repeatability for the low emissions levels tested in this programme, chosen to be approximately representative of future emissions. Whilst there remain some questions to be resolved on some details of the procedure, improving the existing system appears to be the best approach. …
One of the measurement systems, CVS + thermodenuder/thermodiluter + CPC, offers the advantage of counting the number of particles and so increasing the overall sensitivity of the measurement procedure. Whilst the medical evidence remains unclear over which metric is responsible for the health impacts observed, it appears prudent to further evaluate the potential of a number based system. …….
It is recommended that a selection of the measurement systems identified by these work programmes as potential candidate type approval measurement systems be further evaluated in a round robin test.
Based on the results currently available these are:
· Modified PM (a gravimetric filter based mass measurement system).
· CVS + thermodiluter + CPC (a number based measurement system). “
Mit dem CPC (Condensation Particle Counter) steht ein System zur Verfuegung, mit dem zeitaufgeloest die Partikelzahl (genauer: die Partikelkonzentration in 1/cm3 ) im wirkungsrelevanten Groessenbereich entsprechend den Anforderungen einer Typpruefung gemessen werden kann.
Der Zeitplan sieht nunmehr vor, die RichtlinienAnhaenge zu beiden Verfahren bis Ende 2003 fertig zu stellen und im Januar 2004 der GRPE vorzulegen, sowie anschliessend einen Round Robin Test auf dieser Basis durchzufuehren.

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