This paper describes the method und results of a study conducted to evaluate driver controllability in the event of failures of superposition steering systems. The research investigated the driver-vehicle-interaction during the occurrence of steering angle faults and aimed to explore whether limit values in terms of lateral vehicle motion parameters that are valid for different vehicles can be defined. To this end, four test vehicles which covered a considerable range of vehicle characteristics in terms of lateral dynamics were investigated. 98 drivers took part in the study. The chosen methodological approach describes subjective disturbance ratings as a function of objective parameters of lateral vehicle motion. Regression analyses were used to identify those factors affecting subjective ratings. Limit values, which should not be exceeded in the event of system failures, were established. The findings showed that the prediction of subjective ratings of the effects of system failures by fault-induced yaw rates and lateral accelerations are very good, whereas steering wheel torque and roll rate are less important. No significant differences between vehicles were found for yaw rate and lateral acceleration. Thus, tolerance limits for these parameters were established on the basis of the subjective disturbance ratings, which should not be exceeded in the event of system failures. The proposed tolerance limits solely refer to the fault-induced effect; therefore, test trials with participants to ensure compliance with the limits are not necessary. Instead, testing can be carried out under open-loop conditions.


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    Title :

    Controllability of superposition steering system failures


    Contributors:

    Published in:

    Publication date :

    2008


    Size :

    12 Seiten, 7 Bilder, 12 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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