Experimental study on unregulated emission characteristics of turbocharged DI diesel engine with common rail fuel injection system

摘要: In this study, we selected four unregulated emissions species, formaldehyde, benzene, 1,3-butadiene and benzo[a]pyrene to research the emission characteristics of these components experimentally. The engine used was a water-cooled, 8-liter, 6-cylinder, 4-stroke-cycle, turbocharged Dl diesel with common rail fuel injection system manufactured for use medium-duty trucks, JIS second-class light gas oil, which is commercially available as fuel. results experiments indicate follows: formaldehyde tends be emitted under low load condition, while at speed. This believed because decomposes in short time, exhaust stays much longer cylinder speed condition than high one. Benzene it easily oxidized temperature. Benzo[a]pyrene exists phase, its boiling point about 750K (at 128kPa). Once gaseous condenses, trapped by filter soot or sulfate. If temperature area, large part oxidized. Consequently, not great quantity condition.