During the development of modern road vehicles, so-called platform-strategies have been implemented for a long time particularly regarding economic aspects. That is, using as large a number of similar components as possible for configuring assemblies, which are not necessarily perceived differently by the customer. These modular designs also lend themselves to converting conventional power trains to electrical drives and characterize a large number of the BEV's (battery electric vehicles) which are both currently positioned in the international markets and planned for the medium term. However, the considerable weight of electrical energy storage devices having a power output above 15 kWh changes the entire vehicle concept regarding structural weight and vehicle dynamics. For this reason, new concepts for electric road vehicles are to be oriented towards significantly reducing the driving resistances - i.e. drag due to acceleration, inclines, air as well as rolling - as much as possible in order to ensure a greater cruising range for the same electrical energy storage device capacity. In the current contribution, developments in the area of vehicle body and drives within the last two decades are presented and their validity for future vehicle concepts are assessed. This is primarily done by considering the structural weight, use of materials and vehicle safety - that is, those feature and attributes which have acquired special significance in the last few years. Using this knowledge, the potential for both desirably reducing the driving resistances for future generations of electric road vehicles is assessed and consistently giving a new direction to the development of design features for vehicle bodies and drives. In this way, boundary conditions arise for future electric road vehicles whose technical properties are significantly different - particularly regarding the configuration of the motor and drive components as well as the use of materials and the shape of the vehicle body. In this way, the electric road vehicle is developed into a mobility concept which is optimised with respect to its aerodynamic behavior and weight. This concept replaces conventional functions such as, for example, steered front-wheels with controlling the turning direction and the torque of all the wheels (all wheel torque vectoring) and thereby ensuring a maneuverability which has hitherto been unattainable, especially for an urban environment. Possessing such features, enthusiasm and real customer benefits can be promoted and the barriers to market entry for electric road vehicles can be reduced.
Design, package and safety of optimized electric road vehicles
2013
15 Seiten, 8 Bilder, 1 Tabelle
Conference paper
English
Design, package and safety of optimized electric road vehicles
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