In this article, the results of the steering feel evaluation in the context of the Steering Tech 2008 conference will be put forward. The database encompasses 270 test drives by customers (with no previous training in the assessment of steering systems) and professional test drivers using 9 different cars. The steering system evaluation is about current hydraulic, electromechanical and superimposed steering systems. In the report the results of the questionnaire evaluations will be summarised with respect to these four research themes: 'General trends', 'Comparison between customers and professional test drivers', 'Causal correlation' and 'Comparison of the steering system technologies'. The assessed cars were generally found to be lacking in active driving response in the comparison of the evaluations. Here, the customers and professionals identified the same trends. So, the criteria of 'road contact' and 'steering precision', were generally assessed as 'too light' or rather, 'too imprecise'. A further trend comes from the steering wheel angle demand criterion. This was judged to be too high in all vehicles with the exception of vehicles fitted with the steering systems that allow a variable steering transmission. In addition to the identified trends, it also appears that advantages of the steering system technology with regards to steering feel can be effectively judged. The comparison of the evaluations from customers and professionals shows that customers aren't as critical as the professional test drivers when evaluating the steering feel. The evaluations from the professionals differ strongly from the optimal evaluation and are therefore more differentiated. The results of the steering assessment show moreover, that the different criteria can influence each other. It has been found that there is a significant correlation with correlation coefficient R>0.6. In a comparison between the steering system technologies, the superimposed steering systems, then the EPS (Electric Power Steering)-systems achieved the smallest overall deviation from the optimum. The biggest overall deviation from the optimum comes from the HPS (Hydraulic Power Steering)-system. Though, differences in the evaluations within the steering system group show the additional influence of further factors, as well as the influence of different calibration and implementation strategies of the steering systems.
Present-day cars - subjective evaluation of steering feel
Heutige Automobile - subjektive Bewertung des Lenkgefühls
2010
20 Seiten, 18 Bilder, 3 Tabellen, 5 Quellen
Conference paper
English
Present day cars subjective evaluation of steering feel
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