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Engine and vehicle development is a multi-step process: from component design, to system integration, to system control. There is a multitude of tools that are currently being used in the industry for these purposes. They include detailed simulations for component design on one hand, and simplified models for system and control applications on the other hand. This introduces one basic problem: these tools are almost totally disconnected, with attendant loss of accuracy and productivity. An integrated simulation tool has been developed, which is applicable to all of the design issues enumerated above. A key feature introduced for the first time by this new tool is that it is truly a single code, with identical handling of engine and powertrain elements. Further, it contains multiple levels of engine and powertrain models, so that the user can select the appropriate level for the project at hand (e.g. depending on the time scale of the problem).