Hereafter, an integrated method to investigate the correlation between objective and subjective evaluations of steering torque aspects is described in order to front-load and optimize development efforts. It deals with the links between subjective impressions the driver experiences while guiding a vehicle and objective measures from open-loop vehicle dynamics tests. This is accomplished via an experiment with subjects evaluating different steering torque settings in one test vehicle on a rural road profile. Therefore, the car is equipped with a steering torque actuator, which is in turn controlled by a combined Extended Single Track-Steering System Model. Hereby, the vehicle model provides the inputs for the steering system which in turn computes the steering torque. With respect to the on-centre regime, special attention is paid to the friction modelling. By means of the combined model, a 'fingerprint' of the vehicle characteristics can be identified. The method involves vehicle test-rig and open-loop driving manoeuvres as inputs for the model identification. Measurement data collected from those real vehicle tests is fed into an optimization of model parameters. Once the fingerprint is optimized, component parameters can easily be changed virtually, their effects on the test characteristics studied in offline simulations and assessed subjectively in reality. Almost every subjective criterion emerges to be a question of steering character. On the objective side, steering torque gradient, friction deadband from weave and torque magnitudes and gradients from Slowly Increasing Steer Test are found to be key objective characteristics for the description of steering comfort. Hence, the method bridges the gap between virtual and real vehicle steering comfort design by gearing components, overall vehicle behaviour and subjective-objective evaluations.
A method to examine links between subjective and objective evaluations of steering torque utilising a model-based approach
Eine Methode zur Prüfung der Bindeglieder zwischen subjektiven und objektiven Bewertungen des Lenkmomentes mit Hilfe eines modellbasierten Verfahrens
2008
10 Seiten, 8 Bilder, 2 Tabellen, 15 Quellen
Conference paper
English
Lenkung (Fahrzeug) , Drehmoment , Bewertung , Prüfmethode , Korrelation , Fahrzeugdynamik , Experiment , Aktor , Fahrzeug , Versuchsmodell , Prüfstand , Manövrierfähigkeit , Messdaten , Simulation , Reibung , Lenkmoment
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