Although, from passenger cars to heavy duty vehicles, automatic or automated transmissions are on the rise, manual shifting will still be of importance in future. Changing gears manually though requires certain physical work. In addition the processing of information leads to psychological strain. The result is fatigue which distracts the driver from coping with his duty to steer his vehicle. But that has to be performed distinctively, particularly in critical situations. Furthermore, because of generally increasing demands on comfort, requirements for manually shifted gears have been expanded. In spite of the long history of automobiles, there is presently no scientifically proven method to objectively assess the shift comfort of transmission in vehicles. Existing approaches usually have a technocentrical focus on several subsystems of the part system switch gear, namely external gearshift, connection elements, internal gearshift and gears. This research project regards a comprehensive view on the complete system consisting of transmission and driver. The goal is to find quantifiable and repeatable values by a human centric consideration of the shift comfort. The thereby identified criteria are supposed to support the design of switchgears with regard to comfort. Interesting research questions concern the impact of the technical influences on the driver. Hereby newest conclusions in comfort theory will be considered. Especially the cognition and the derived effect on the operation of the control element gear lever are a new approach. Disagreeable phenomena are gears jumping off their lane or the possibility that a gear may not be shifted. Mainly in earlier times this problem occurred with rigid connections between external and internal gearshift and for example the elastic cabin mounting. Obviously it has to be avoided. Noise from the gear box or noise coming through the coverage of the external gearshift has to be reduced to a minimum. It is a basic demand as it is nowadays hardly acceptable. Not all causes of gear box noise are explored. Still a research field is for example the avoidance of rattle and clatter. Although vibrations of the power train may be a sign of performance, no customer accepts them at normal use. Therefore, like the noise, vibrations have to be avoided as much as possible.


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    Title :

    Values of comfort-relevant influence on dynamic shift of transmission in vehicles


    Contributors:
    Wessel, W. (author) / Maier, T. (author)


    Publication date :

    2008


    Size :

    11 Seiten, 5 Bilder, 16 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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