An experimental study has been carried out on a production vehicle by means of roller-bench emission tests in order to optimize alternative aftertreatment systems. To this aim different comparisons between the production exhaust system and new strategies are discussed in the present paper with aid of both modal emission data and bag tailpipe figures. The present work shows the application of a alternative solution that complies with future emission legislation with regard both to HC, CO, NO x and PM without any major engine power output or fuel consumption penalty. 1. The exhaust temperature is low. Because of this the catalyst can be Òblown outÓ even in warmed up conditions. 2. The engine works in lean conditions. NO x cannot be reduced to Nitrogen in this conditions with a three way catalyst. 3. Soot particles are produced which are suspected to cause cancer [1].
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