Comparative Analysis of Exhausted Gases Opacity under Urban Traffic Conditions

摘要

Road transportation performed by vehicles equipped with internal combustion engines has an important contribution to environmental pollution. Naturally aspirated diesel engines excel in producing hydrocarbons and carbon monoxide and supercharged engines in producing nitrogen oxides. Compression-ignition engines produce smoke at high loads. Experimental researches on traffic simulation with a Volkswagen Caddy 1.7DTI car were accomplished in Road Vehicles Laboratory at the Politehnica University of Timisoara and aimed a large congested vehicles route from Timisoara downtown (a traffic light intersection and a non-traffic light one, 6 pedestrian traffic light crossings and 4 non- traffic light ones). The studied route is 2.3 kilometers length, where the traffic is carried on "bar to bar". Opacity values for engine transitory operation regime were obtained as results of experimental researches. The evaluation method of the exhausted emissions in the laboratory is more than adequate, offering the possibility of adjustments required for a simultaneously clean and economical engine operation.