In this work the fuel consumption of two vehicles is compared. For investigating the fuel consumption a whole vehicle simulation is developed with the Smart Power Trains library and the Smart Electric Drives library. Both libraries are written in Modelica language. As a reference vehicle a conventional vehicle with manual transmission is modelled. A parallel hybrid electric vehicle with a starter/generator and two transition machines at the front and rear drive train wheels is compared with this reference vehicle. The operating strategy of the hybrid electric vehicle is explained. Furthermore, an analysis for finding the optimal sizes of the electric machines for the parallel hybrid electric vehicle using the developed simulation tools and the developed operating strategy is presented. The practical operation modes of the parallel hybrid electric vehicle are considered with regard to the implemented drive train configuration. A dynamic operating method is developed to determine the optimal power split between the internal combustion engine and the electric energy sources. The computer simulation results show the improved fuel consumption of the hybrid electric vehicle. The implemented vehicle simulation allows the determination of the actual fuel consumption and shows evidence of economic savings potential by using alternative drive train concepts. Different vehicle drive train concepts and operating cycles can rapidly be analized and tested on fuel consumption and efficiency. Based on the presented results, the design point of the energy sources and the energy consumption of each vehicle component can be calculated and determined. It is shown that the presented libraries can be used to accelerate the design process of innovative vehicle concepts significantly. This investigation can only be used for the design of vehicles, which are driven in an exact operating cycle such as the exact city drive, the exact reiteration drive, etc. Based on the calculated decrease in fuel consumption the reduction of energy and emissions of a vehicle on European level can be projected.
Simulation of hybrid electric vehicles
Simulation hybrid-elektrischer Fahrzeuge
2006
7 Seiten, 6 Bilder, 10 Quellen
Aufsatz (Konferenz)
Englisch
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