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In the last years, the requirements for electrical energy systems in motor vehicles have increased considerably. In the past, many studies were focused on single components of the electrical system. However, to shorten the development process, reduce costs, improve reliability and also to optimize the fuel consumption due to the electrical system, the electrical system must be regarded as a whole. The Robert Bosch GmbH has developed a simulation environment, which is intended to improve the development process of new vehicle electrical systems by means of computer simulation. On the basis of a freely selectable driving cycle and various driver models, it is possible to simulate the behavior of electrical energy supply structures. The model of the electrical system is coupled to a dynamic model of the drivetrain. The characteristics of this drivetrain can also be modified and various vehicle models can be selected for simulation.