These days, in order to meet the exhaust emissions standards of future vehicle while at the same time reducing fuel consumption, automotive manufacturers are researching in various ways. From this point of view, the automatic Stop and Go system is proposed the one of solutions. For the higher reliability of the Stop and Go System, it is necessary to review and change the existing charging system design concept. That is to say that the research on the electric energy balance for new vehicle which is adapted the Stop and Go system is a course that should be executed. However, it is not easy to develop the new charging system and optimize the fuel consumption due to the electric loads in a limited time. Therefore, Hyundai Motor company established a computer simulation environment in order to solve the difficulties and to secure higher reliability at the beginning of vehicle development. This paper introduces the rough structure of computer simulation environment and shows the simulation process and results for the various matrixes of alternator and battery. Through the simulation, the result shows which kind(s) of battery and alternator matrix can meet the engineering specification. (Design Target) and the alternator efficiency in refer to alternator pulley ratio.
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