A heat distribution among the main components of the power train optimized for the NEDC (New European Driving Cycle) is effective also in customer relevant driving cycles. Real life thermal management measures with similar effects on the power train temperatures as the theoretical heat addition to the vehicle in the present work can probably be NEDC optimized without seriously affecting the gap between NEDC and customer fuel consumption. Nevertheless the optimum heat distribution may change when the available amount of energy is changed. A small amount of thermal energy generally has the highest effect in the gear box. If more energy is available, the rear axle drive should be warmed up. Only when the gear box and the rear axle drive are already warmed up, the energy should be directed to the engine. The presented results show that it is possible to simulate the warming up of a passenger car in the NEDC and other driving cycles with a network simulation method with satisfactory accuracy. The effects of heat management measures which are sometimes difficult to find in an experiment can be investigated numerically with more variations of the vehicle parameters and considerably less cost. Different heat management interventions can be analyzed in one model, as well as their interaction in any combination. The results will enable engineers to focus future heat management measures on the points of maximum benefit and to further improve fuel consumption during vehicle warm-up.
Customer related CO2-reduction by selective heat supply during vehicle warm-up
Kundenbezogene CO2-Reduzierung durch selektive Wärmezufuhr während des Fahrzeugwarmlaufens
2007
10 Seiten, 8 Bilder, 1 Tabelle, 6 Quellen
Conference paper
English
C640/008/2007 Customer related CO~2-reduction by selective heat supply during vehicle warm-up
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