The development of chassis systems is getting renewed attention with increasing demands for vehicles' CO2 efficiency. Traditional passive systems have to be adapted to changing operating conditions due to modified load distributions (e.g. heavy batteries resulting in increasing yaw moment of inertia and increased unsprung masses for in-hub motors) and increasing load spans (e.g. smaller and less weighing vehicles with the same or increased transport capability). At the same time, even the traditional suspension design conflict between comfort and safety may be amended by a CO2 target to minimise energy consumption of the passive dampers. Active chassis systems have to be re-evaluated with respect to CO2 impact (equivalent to the battery range for e-vehicles). Is there a chance of replacing them with intelligent passive systems (e.g. replace a variable semi-active shock absorber with a frequency-dependent passive system) - or is there some potential for using energy-on-demand approaches instead of today's more simple, but also less energy-efficient solutions? Even existing control strategies (e.g. in the ESC systems for lateral stability control) need further attention, if we want to make use of the higher dynamic responsiveness of electric motors in axle or even individual configurations of the wheel. Today's solutions for vehicle state observation rely on existing powertrain topologies with only limited bandwidth and mechanical connections by differential gears. This results in two alternatives for today's product development: emulating the old propulsion systems' behaviour or re-starting the development of new vehicle stability control systems taking into account the new propulsion systems' properties. So, we can finally state that the development of electrically actuated vehicles not only needs much attention for the replacement of the combustion engine with an electrical propulsion system, but also needs all the vehicle system dynamics competencies that we have acquired during 125 years of automotive history - and which had seemed to have become an oldfashioned discipline some years ago. Chassis system technology can and should take up pending CO2 challenges and proactively develop solutions for energy-optimal, safe, and comfortable driving. Accordingly, future active chassis systems should be consistently thought out. In terms of efficiency and cruising range, they may be superior to the traditional passive solutions.


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    Titel :

    System dynamics of electrified vehicles: some facts, thoughts, and challenges


    Weitere Titelangaben:

    Systemdynamik elektrisch betriebener Fahrzeuge: Einige Fakten, Gedanken und Herausforderungen


    Beteiligte:
    Rauh, Jochen (Autor:in) / Ammon, Dieter (Autor:in)

    Erschienen in:

    Vehicle System Dynamics ; 49 , 5 ; 1005-1020


    Erscheinungsdatum :

    2011


    Format / Umfang :

    16 Seiten, 12 Bilder, 33 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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