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Simulation of the Warm-Up Behavior of Engine and Cabin After a Cold Start
Published May 20, 2007 by Institution of Mechanical Engineers in United Kingdom
The engine warm-up after a cold start depends not only on the engine, the driving cycle and on the vehicle itself, but also on the behavior of systems like cooling circuit and powertrain. The individual systems stand in interaction both with the engine as well as with other systems. This requires for the simulation of the thermal management system that all relevant subsystems are simulated simultaneously and that the interaction between the individual systems is considered in a correct way. Based on an example, the modelling of the individual subsystems of the vehicle is shown. For the verification of the single subsystems experimental measurements on a vehicle dynamometer have been performed. The comprehensive vehicle model is verified with the measurement data of a driving cycle on the vehicle test bench and on the experimental data of a road test. Key parameters such as coolant temperature, engine temperature, and cabin temperature are compared between measurement and simulation, in order to assess the degree of achievable accuracy of the simulation model.