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A comprehensive simulation method is presented for the optimization of vehicle warm-up. Sophisticated one dimensional simulation methods based on network theory are used for flow simulation to limit computation time and guarantee high simulation quality. Partial integration of three dimensional flow simulation methods help to improve accuracy. Simulation sub-models for the engine, the HVAC system, and the passenger cabin are combined to simulate the warm-up process of the vehicle. This functionality is implemented in a modern software tool named KULI to support the development engineer as good as possible. Steady state and transient simulation are used to optimize the warm-up behavior.

The thermal management of cars and commercial vehicles has become increasingly complex in the last years. Sophisticated simulation tools assist the engineer in finding a suitable solution to the problem of making a good thermal management. But the possibilities of the available software are still limited, in particular it is often not possible to search for the best solution. In this paper we present new approaches that extend the possibilities of such programs, where special emphasis is put on the optimization of parameters. These approaches, embedded in an easy-to-use graphical user interface, mark a big step towards finding an optimal solution.