Experimental investigation, optimization and ANN model prediction of a gasoline premixed waste cooking oil fueled HCCI–DI engine

  • G. M. Lionus Leo
  • S. Sekar
  • S. Arivazhagan
Technical Paper


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.


HCCI–DI Waste cooking oil Artificial neural network Response surface methodology Gasoline premixing 

List of symbols



Cylinder pressure, bar


Number of data set


Peak cylinder-pressure, bar


Correlation coefficient


Coefficient of determination


Volume, m3

Greek symbols


Brake thermal efficiency


Adiabatic exponent


Crank angle corresponding HRRmax


Crank angle corresponding Pmax



Actual observation


Crank angle interval, °CA


Predicted output value



Artificial neural network


Analysis of variance


Active thermo atmosphere combustion


Compression ignition


Carbon monoxide


Copper-doped zinc oxide


Direct injection


Exhaust gas recirculation


Gasoline direct injection




Homogeneous charge compression ignition


Heat release rate


Maximum heat release rate


Mean absolute percentage error


Oxides of nitrogen


Normalized root mean square error


Premixed charged compression ignition


Premixed fuel ratio


Rate of pressure rise, bar/°CA


Response surface methodology


Root mean square error


Specific fuel consumption


Spark ignition


Start of combustion


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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringSt. Joseph’s College of EngineeringChennaiIndia
  2. 2.Department of Mechanical EngineeringVelammal Engineering CollegeChennaiIndia

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