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G. Lux, S. Winter, P. Hofmann, B. Geringer:
"Application of Thermal Management to Reduce Fuel Consumption in Hybrid Power Trains";
Talk: 5th Symposium Hybrid Vehicles and Energy Management, Braunschweig, Stadthalle (invited); 2008-02-20 - 2008-02-21; in: "Hybrid Vehicles and Energy Management", (2008), ISBN: 978-3-937655-15-4; 18 pages.

The reduction of fuel consumptions and therefore the reduction of CO2 emissions of vehicles is an objective with high priority when new vehicles are designed. With operating states like torque shifting, start/stop and regenerative braking hybrid power trains can decrease their fuel consumption significantly. Further potential for improvement is expected if the cooling systems of the various components are connected and controlled in combination to contribute to an efficient warm up ofthe power train following cold starts.
In this paper an existing power train model for longitudinal simulation is extended to reproduce the thermal behavior of the individual components. This includes the interactions of the efficiencies and the particular thermal states. The extended and validated model allows the development of operating strategies aiming at a short and efficient warm up phase. The potential provided by the thermal coupling of the components can also be analyzed with this tool.
The effects of different operating strategies and cooling concepts on the fuel consumption are presented on the basis of simulations of a parallel hybrid power train.