Particulate matter emissions from two-stroke mopeds

ENEA started an experimental activity aimed at characterizing particulate matter emitted from two-stroke vehicles, especially to determine its physical and chemical parameters; total mass, granulometric distribution, major chemical compounds. In this paper, results from the first phase of the experimental campaign are shown. Particulate matter emissions in terms of total mass from two mopeds, one equipped with an engine built according to the limits stated on the Directive 97/24/CE(EURO 1) and the other equipped with an engine of the last previous generation, were measured. Measures were performed under different steady regimes, varying speed and load, and according to ECE-47 cycle. Tests have shown that particulate matter emissions a total mass are related to lubricants consumption. Moreover they are considerable for both mopeds. As for the EURO 1 moped, operating conditions determine catalyst temperature, as expected, and its efficiency as a consequence. During ECE-47 cycle tests, particulate matter emissions observed for the catalyzed moped resulted 75% lower than those recorded for the ""ante EURO 1"" moped.