Experimental study on the performance of a liquefied petroleum gas engine according to the air fuel ratio

Abstract

The global market of the internal combustion engine is decreasing, and powertrain energy sources will diversify in the next 5-10 years. Alternative fuels are some of the technologies that can be applied immediately to lowpollutant internal combustion engines. Liquid petroleum gas (LPG) is a representative low-pollutant fuel, and its use is increasing worldwide. Therefore, in this study, the fuel consumption, combustion, pollutant emissions, and efficiency performance of an LPG engine were tested and analyzed by adjusting the air fuel ratio, which is the main control parameter of the spark-ignition engine. Finally, the fuel efficiency and pollutant emission performance improved simultaneously by adjusting the air fuel ratio in detail from 1.1 to 1.2. This phenomenon can be applied to internal combustion engine vehicles and LPG-hybrid electrical vehicles and generator engines.