Analysis and theoretical modeling of thermal influences on the inlet process for a spark-ignition engine

The air-fuel mixture inlet during the admission stroke and also the discharge of the exhaust gas through the exhaustion, in the process of gas change, influences directly the power and the engine efficiency. During this study, we will analysis the conditions of the intake deployment, especially from a thermal point of view, highlights influences with various implications. Thereby, influence of the thermal regime of the engine concerning the filling highlights how the heating of the air-fuel mixture affects negatively the filling by reducing the filling coefficient values, Based on the aspects of the analysis in the model developed by the authors, expressed as a distinct function of the degree of filling depending on the temperature of the charge air at the end of the intake process and further increase the temperature of the charge air during the intake process, due to the contact with the warm surfaces of the engine. The model ensures significant results that can be used to improve the performance of the spark ignition engine. (C) 2018 The Authors. Published by Elsevier B.V.