Comparison of Spark Ignition Engine Performance and Emission Analysis Using Gasoline, LPG and Mixture Fuels

Abstract

Emissions of higher amount of pollutants are a major concern in the use of conventional fuels such gasoline and diesel. Exhaust emissions such as nitrogen oxides (NOx), carbon monoxides (CO) and sulphur dioxides (SO2) affect the human body adversely. The problem of emission of higher amount of harmful pollutants can be diluted by use of alternate fuels such as liquefied petroleum gas (LPG), gasoline and their mixtures. The emission level can be brought down to safer level set by international agencies. In this work the engine was tested using LPG, gasoline and with gasoline and LPG-air mixture; so that comparative study of the emissions of pollutants gases and engine performance can be made. The results of the experiments have shown improvement in efficiency of LPG mode engine in comparison to gasoline and mixture fuel engine. Simultaneously, there was a reduction in HC and CO emissions of LPG and mixture fuel engines with reference to gasoline mode engines. On the other hand, the pure LPG fuel system showed a tremendous reduction in emissions, delivered a comparable torque as compared to gasoline and mixture fuel engine. The fuel consumption rate of LPG fuel mode is slightly higher than the gasoline mode. LPG mode is more economical but in most of the cases it results in about 10 -15% power loss.