Study Emissions and Performance of A Variable Compression Ratio Engine (VCR) Using Gasoline With and Without Exhaust Gas Recirculation (EGR)

This paper addresses the application of Exhaust Gas Recirculation (EGR) for reduced oxides of nitrogen (NOx) emissions from gasoline engine. Since there hasn’t been any comprehensive review on gasoline engine using exhaust gas recirculation, this paper is made by its motivation. Prevailing and future emission norms compel engine manufacturers to incorporate techniques to reduce engine out emissions especially NOX and particulate matter NOx formation predominantly depends on high combustion temperature and literature indicates EGR is an attractive method to reduce combustion temperature. EGR temperature is an important factor while admitting higher percentage of EGR. Higher EGR temperatures caused due to increased loads limit the conduct of higher EGR ratios. EGR cooling can be advantageous when higher ratios of EGR need to be employed. The effect EGR temperature on engine thermal efficiency, NOx, smoke and HC emissions at different load conditions are discussed in this paper. NOx reductions and thermal efficiency were found to be better. Smoke and HC emissions increase for cooled EGR as compared to no EGR case.