Experimental investigation and ANN modelling of the effects of diesel/gasoline premixing in a waste cooking oil-fuelled HCCI-DI engine

This paper intends to study the combustion, performance and emission characteristics of the HCCI-DI engine with waste cooking oil (WCO) biodiesel as direct injection fuel and diesel/gasoline as the premixed fuel. 20% of fuel (gasoline/diesel) was injected at inlet manifold along with the intake air during the suction stroke. Balance 80% of the fuel (diesel, B50 and WCO) was injected into the cylinder at 23 °CA before TDC. The outcomes observed from the experimentations showed that the HCCI-DI engine was resulted increased brake thermal efficiency ( η bth ) than conventional DI engine. Increase in the η bth up to 4.23% was found form the gasoline-premixed HCCI-DI operation compared to DI operation. During HCCI-DI, 14.81% and 4.3% drop in oxides of nitrogen (NOx) were observed for the diesel and gasoline premixing, respectively, compared to conventional engine. A decrease in the hydrocarbon up to 54.17% was noted for the WCO-fuelled DI engine compared with diesel-fuelled DI engine. 50.66% and 39.21% reduction in the smoke emissions were found for the diesel and gasoline-premixed HCCI-DI, respectively, compared to diesel-fuelled DI engine. Artificial neural network modelling was proposed to forecast the emissions and η bth of the HCCI-DI engine.