Estimating the power demand of a steering system is one of the main tasks during steering system development in the concept phase of a vehicle development process. Most critical for typical axle kinematics are parking maneuvers with simultaneously high rack forces and velocities. Therefore, the focus of the article is a tire model for standstill, which can be parametrized without measurements, only having tire dimensions and conditions (inflation pressure and wheel load) as input. Combined with a double-track model, a vehicle model is developed, which is able to predict the rack force and is fully applicable during the concept phase. The article demonstrates quantitatively that the tie rod forces, and thereby especially the tire bore torque, cause the largest fraction of the power demand at the rack. For this reason, the prediction of the bore torque is investigated in detail, whereby basic approaches from the literature are analyzed and enhanced. Furthermore, an approach is derived for considering the influence of horizontal forces in the tire contact patch on the bore torque. The development of the tire model is supported by a tire data basis with approximately 900 measured tire configurations. Finally, two test vehicles are used to validate the vehicle model successfully.


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    Title :

    Simulation of the Steering System Power Demand during the Concept Phase Focusing on Tire Modelling at Standstill


    Additional title:

    Sae International Journal of Passenger Cars. Mechanical Systems
    Sae Int. J. Passeng. Cars - Mech. Syst


    Contributors:


    Publication date :

    2021-11-09


    Size :

    22 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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