The Effect of EGR on The Performance and Emissions of Engine Powered by Gasoline and LPG

Abstract

Internal combustion engines are one of the sources of harmful pollution to the environment and human health, through which gases are emitted from the exhaust nozzle, as carbon monoxide (CO), unburned hydrocarbons (HC) and nitrogen oxides ( ). Because in recent years from the significant increase in the number of vehicles on the world roads and the consequent increase in the amount of exhaust emitted as a result of this increase. The scientists and automotive engineers are produced several effective ways to reduce the largest possible quantity of emissions without affecting the power of the engine, one of these methods, which proved to be effective is to use exhaust gas recirculation (EGR). In this project the research team will study experimentally the effect of EGR on the engine performance, emissions, and powered by gasoline and liquefied petroleum gas (LPG), and design a mechanical EGR to investigate its impact on engine performance and emissions with and without EGR for both fuels. This design is used to avoid the complexity of the programming Electronic Control Unit (ECU). The importance of this project is study the EGR effect on the engine power, percentage of emission and fuel consumption, then comparison this effect with gasoline and LPG engine. and to protect the environment and human health from emission. The results obtained without used EGR in gasoline and LPG indicate to brake power of LPG is less about 21% than gasoline and brake fuel consumption of LPG is less 23.6% than gasoline and the NOX, CO, CO2 emissions are reduced in LPG, while the higher hydrocarbons (HC) emissions were obtained in LPG compared with gasoline. On the other hand the results obtained without used EGR in gasoline and LPG indicate to brake power of LPG is less about 24% than gasoline and brake fuel consumption of LPG is less 27% than gasoline and the NOX decrease in both fuel. CO, HC are increased in both fuel.