Abstract
The effect of diesel exhaust aftertreatment system on exhaust gas emissions during cold-starting was evaluated experimentally. The aftertreatment system which consisted of diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) was used. Exhaust gas emissions were measured at front and rear of the aftertreatment system, and intensity of exhaust odor was assessed by sensory assessment. The results indicate that HC was adsorbed on the aftertreatment system and desorption of some of HC occurred with elevation of exhaust temperature. HC which did not adsorb onto the aftertreatment system was discharged from a tail pipe as a white smoke. Some of HCHO, which is the primary odor component of diesel exhaust, was also adsorbed on the aftertreatment system. It was confirmed that odor intensity at the rear of the aftertreatment system was weaker than that of the front side.
