Dynamic modeling of waste energy harvesting system for spark ignition engine internal combustion engine

Abstract

Several methods for waste thermal energy recovery from IC engine have been studied by using supercharger or turbocharger or combined. This study presents an innovative approach on power generation from waste of IC engine based on coolant and exhaust. The waste energy harvesting system of coolant (weHSc) is used to supply hot air at temperatures in the range of 60-70°C directly into the engine cylinder, which would be useful to vaporize the fuel droplets into the cylinder. Increase in fuel vaporization helps to improve the engine thermal efficiency by 1% to be 29% at 4000 rpm due to reduction in fuel consumption. The waste energy harvesting system of exhaust (weHSex) has been developed with integrating fuzzy intelligent controlled micro-faucet emission gas recirculation (MiF-EGR). In this study the MiF-EGR has been used to maintain the intake air temperature at 70°C and reduce higher intake temperature by allowing exhaust gas flow to the engine cylinder chamber thus increase the engine volumetric efficiency. The performance of weHSc and weHSex equipped engine has been investigated by using GT Suite software for optimum engine speed at 4000 rpm. The result shows that specific fuel consumption of engine has improved by 2% due to vaporization of fuel droplets. Reduction of hydrocarbon (HC) formation inside the engine combustion chamber has been reduced by 9% at 4000 rpm thus control the emission level. Volumetric efficiency also has been improved in overall by 2.2%. Lastly, the brake power has increased by 8% due to the fuel atomization and vaporization at engine intake temperature of 70°C.