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Analysis of limited and nonlimited emissions of scooters was performed during several research programs of the Swiss Federal Office of Environment Forests and Landscape (FOEFL) - and as a contribution to the European project ARTEMIS *).
Small scooters, which are very much used in the congested centers of the European cities are a remarkable source of air pollution. Therefore every effort to reduce the emissions is an important contribution to improve the air quality in urban centers.
In the present work detailed investigations of a Peugeot scooter with TSDI (Two Stroke Direct Injection) were performed and the emissions were compared to the other 2-S & 4-S scooters.
As nonlimited emissions the nanoparticulate emissions at cold and warm operating conditions were measured by means of SMPS, ELPI and NanoMet *). The measurements were both: at steady state and at transient operating conditions.
It can be stated, that the TSDI-technology offers advantages of lower gaseous and particulate emissions. It reaches about the level of 4-S vehicles.
Since the particulate emission of the 2-S consists mainly of lube oil condensates the minimization of oil consumption stays still an important goal. Further improvements of oil & fuel quality, as well as optimisation of catalysts can also contribute to a reduction of particulate matter and particle counts.