Analysis of Post-oxidation Phenomena in a Turbocharged DISI Engine Focused on Gas and PM Emissions and Gas Temperature

Abstract

The detailed investigation of post-oxidation phenomena based on gas emissions, PM and gas temperature were performed on a turbocharged DISI engine. In post-oxidation phenomena, rich air-fuel mixture is used inside cylinder and this rich excursion gives rise to the production of CO, THC, PM and H₂ emissions. Then the scavenged O₂ and emitted H₂ play a key role for post-oxidation reaction (exothermic) with CO, THC and PM in exhaust manifold and in-turn can aid in increasing the temperature along with overcoming of decrease in temperature by heat absorption reaction. The actuation time delay of reaction was also investigated with emissions and temperature with fast response devices in transient mode.