LAUSR

In this study, a Homogeneous charge compression ignition–Direct injection (HCCI–DI) engine was experimentally investigated with waste cooking oil (WCO) biodiesel and its blends with diesel as the DI fuel and gasoline as the premixed fuel. 20% of the gasoline was introduced as the premixed charge and remaining 80% of the fuel was supplied directly into the cylinder at 23° before top dead centre (TDC). The experimental results were compared with DI combustion. Early start of combustion (SOC) was observed from the WCO fueled DI combustion. Lean homogeneous combustion from the gasoline premixed HCCI–DI engine increased the ηbt up to 4.23% compared with DI combustion. NOx emissions decreased up to 11% for the WCO fueled HCCI–DI combustion unlike WCO fueled DI combustion. WCO biodiesel-fueled HCCI–DI combustion emitted 6.67% less HC emissions than diesel-fueled DI combustion. ANN modeling was projected to predict the emission and performance characteristics of the gasoline premixed HCCI–DI engine. Response surface methodology (RSM) was accustomed to optimize the engine operating parameters.