V-16, 1 Emissions of New Technology Euro 4 Vehicles M.V. Prati 1 , M.A. Costagliola 2 1. Istituto Motori - C.N.R., Napoli – ITALY 2. Dipartimento di Ingegneria Chimica - Università Federico II, Napoli – ITALY 1. Introduction Pollutants emissions by on-road transport is still responsible for air pollution in urban areas due to the growing number of circulating vehicle. Despite of technological improvements in terms of engine and after treatment devices performance, exhausts of vehicles decisively influence the urban air quality. In recent years particular concern is given to organic micro- pollutants and particulate emissions, for their dangerous effects on humans and environmental health. It was largely demonstrated the harmful aspect of particulate related to the its dimensions and to its chemical composition. Smaller particles are able to penetrate more deeply in human lungs and particles emitted ad the vehicle exhaust are mainly composed by a carbonaceous fraction with condensed organics included carcinogenic substances such as aromatics. Moreover, the European Commission wants to promote the purchase of fuel- efficient vehicles, as a strategy to reduce carbon dioxide emissions in the atmosphere which represents a strong greenhouse gas. In order to characterize emissions and fuel consumption of new available technologies, several tests were performed on a gasoline-electric hybrid car, a bi-fuel vehicle fuelled with natural gas (CNG) and a diesel vehicle equipped with particulate filter (DPF). All the vehicles, approved according to Euro 4 standards, were tested on chassis- dynamometer during type-approval and real driving cycles for computing emission factors of carbon monoxide, hydrocarbons, nitrogen oxides, carbon dioxide and particulate characterized as total number of particles and dimensional distribution. 2. Experimental set-up Three in-use vehicles were tested over driving cycles executed on chassis-dynamometer. During tests gaseous pollutants and particulate were measured. Characteristics of tested vehicles, driving cycles and measurement devices will be detailed in this section. 2.1. Vehicles Vehicle Engine type Engine displacement cm 3 Power, kW After treatment devices Transmission Honda Civic Hybrid Gasoline engine, multiport sequential fuel injection i-VTEC with Electric Hybrid 1339 85 (70+15) Exhaust Gas Recirculation (EGR) plus TWC automatic Fiat Punto 60 Natural Power Gasoline engine, electronic and sequential MPI 1242 38 Three Way Catalyst (TWC) 5-speed manual Mercedes Sprinter Van 315 CDI Electronically controlled direct injection with common rail, turbocharger and intercooler 2148 110 Diesel Oxidation Catalyst (DOC) plus Diesel Particulate Filter 6-speed manual Tab. 1 Vehicle characteristics