Study on Combustion of Range Extender Spark Ignition Engine Fueled with Biogas

A study on combustion of range extender spark ignition engine fueled with biogas was conducted using a simulation method in BOOST AVL software. The study was conducted using a two cylinders range extender based spark ignition engine for 35 kW of an electric vehicle fueled with gasoline-biogas mixed varied from 0 to 100% by volume. The biogas fuel in this study is represented as high purity biogas after purifying process which mainly contains CH4 or methane. The engine was operate on 3500 rpm and biogas was fumigated into the intake manifold. The results showed that the highest in-cylinder pressure obtained from engine fueled with 80% biogas. Meanwhile, the lowest in-cylinder temperature resulted from the engine fueled with 100% of biogas. Finally, the emission of CO and HC increase with the increases of biogas content, while the NOx is decrease when the biogas content increases.