Starting from the requirements, a new integrated vehicle concept including a lightweight structure of carbon fiber with a so called spilt axle powertrain concept is realized for the sports car BMW i8. In the spilt axle powertrain layout, the electric engine and the combustion engine are each connected to another axle. In the case of the BMW i8, the electric axle is the front, while the rear axle is primarily driven by a conventional engine. As shown, the split axle powertrain is a great challenge to the design of the vehicle dynamics. On the one hand, the axles have completely different characteristics and on the other hand the availability especially of the electric engine is limited due to limitations of the battery. As a sports car, the BMW i8 has to fulfill the requirements of reproducibility and agile driving behavior. To meet all these requirements for the sake of efficiency and dynamic, vehicle dynamics control algorithms have been implemented for torque distribution in the i8. These algorithms ensure an on-demand employment of electric power to ensure agile and reproducible driving behavior. While the vehicle dynamic is strongly interacting with the powertrain and appropriate architecture has been implemented, which connects different software modules like powertrain control, the in-house developed QDM and classical DSC software from an external supplier. The realization of the shown approach in a vehicle concept with highly interconnected functions is demonstrated by the product launch of the BMW i8. It combines apparently contradictory features like zero emission and noise free driving in urban areas, long distance traveling on highways and high dynamic rides on open roads. The proposed technical solutions regarding lightweight structure, innovative powertrain and intelligent control algorithms and control structures together with the appropriate engineering process are mainly responsible for the success of the BMW i8. As the basic of the electronic part of the chassis is the in-house developed control algorithms, which are located in the QDM software module and the BMW powertrain concept neutral software module, a split axle powertrain concept like in the BMW i8 can be migrated to all kinds of powertrain concepts, by simply changing some software parameters in the high level logic. The modularity of the software and the possibility of scaling allow an adaption to the different combinations of engines and vehicle dynamic actuators.


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    Titel :

    The electronic chassis of the new BMW i8 - influence and characterization of driving dynamics


    Beteiligte:
    Wimmer, Christian (Autor:in) / Fetten, Jan (Autor:in) / Odenthal, Dirk (Autor:in)


    Erscheinungsdatum :

    2014


    Format / Umfang :

    17 Seiten, Bilder, 11 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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