Many new vehicle propulsion concepts aim for lowering fuel consumption and emissions. Simulation is an efficient tool for design of such systems. An electric series hybrid city bus, driven on a specific route, is used as a case study for involving simulation in the design process. The first objective of this work is to verify models for transport task and driver. The second objective is to optimize the energy storage size with respect to fuel consumption, emissions and performance. The third objective is to evaluate the optimized hybrid bus. Comparisons are made with a conventional bus. The overall conclusion with this work is that modelling and simulation is a very useful tool in the design of alternative propulsion systems. The authors suggest, however, that the concept of driving cycles, i.e. prescribing speed vs time, steps aside in favour of more realistic transport task and driver models especially for design of city buses. It is important, but not easy, to verify such models. Some appropriate tasks suggested, in order to really evaluate the propulsion system concept are: Verify the transport task and driver models also through measurements on the real bus route, and preferably using both conventional and hybrid buses. Develop/optimize the control strategy, in order to have a more fair comparison. A longer route, typically some tenths of km, is probably better, since it would reduce the influence of, e.g. different initial and final SOC in the energy storage. Extend the simulations to cover the influence of traffic interaction. Include accessories in driveline, such as pneumatic compressors and air conditioning.
Modelling and simulation of an electric hybrid bus in city traffic
Modellierung und Simulation des Betriebs eines Hybridbusses im Stadtverkehr
1999
12 Seiten, 13 Bilder, 1 Tabelle, 8 Quellen
Aufsatz (Konferenz)
Englisch
Modelling and Simulation of an Electric Hybrid Bus in City Traffic
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