Abstract
In this research, new heat transfer engine model realizes the new way of Air/Fuel ratio controlling method. New heat transfer model uses two modeling methods which are a manifold heat transfer model and a lumped-mass heat transfer model which describes the heat transfer of the engine combustion. Heat transfer in intake port is one of the causes of A/F fluctuation, because the heated air in intake port expands and cuases charging efficiency variation which affects A/F fluctuation. A lumped-mass heat transfer model of vehicle gasoline engine and its feed forward A/F controller which use valve and port temperature is developed to eliminate A/F fluctuation.
