The present paper is focusing on a basic research for an initial design of an internal combustion engine for use in a range extender unit for an electric vehicle. The paper introduces a short description of the power train concept as well some interesting points, problems and challenges during the design process of the internal combustion engine. Some of them are connected with a proper selection of the engine configuration (number of the cylinders, their configuration, etc.), a determination of the engine main parameters (bore and stroke) and how they affect the engine operation and performance. Different parametric models are used and some output results are presented.
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