Investigation on NOx control in SI Engine Assisted with Hot and Cold EGR

Abstract

Abstract In this paper, we have conducted a study in a 2.2 kW variable speed SI engine coupled with electrical loading, whose main objective is to reduce the NOx emissions coming out of the engine. To achieve this outcome, we have opted for the EGR technique. We have opted for this technique because firstly it is a proven technique that has been successfully implemented in CI engine and secondly as it reduces the peak engine temperature leading to increased engine life. EGR is implemented by using EGR manifold which replaces the regular intake manifold. Also, a flow control valve is used to control the percentage flow of exhaust gases. From this study, we can conclude Cold EGR is effective in reducing NOx but lowers the efficiency. Additionally, a reduction in CO2 percentage is also observed at the cost of the increase in HC.