Analysis of Emission Behavior of Aldehydes during Cold-Starting of Diesel Engine

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  • ディーゼル機関の低温始動時におけるアルデヒド類排出挙動の解析
  • ディーゼル キカン ノ テイオン シドウジ ニ オケル アルデヒドルイ ハイシュツ キョドウ ノ カイセキ

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The influence of diesel exhaust aftertreatment system on tailpipe emission of aldehydes during cold-starting of diesel engine was examined. Emission behavior of aldehydes at rear side of the aftertreatment system was compared with that of engine-out emission. Differences of the emission behavior indicate that dissolving of aldehydes in water and physical adsorption of aldehydes on wall surface had been taking place within the aftertreatment system during the early stage of after the engine start-up. Subsequently, the trapped aldehydes within the aftertreatment system were discharged from it as engine warm-up progressed. Emission trend of aldehydes roughly corresponds to that of exhaust odor intensity evaluated by sensory assessment.

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