Throughout the development of a steering system, steering feel plays a very important role and is a very intense discussed topic with many different opinions on the 'ideal' steering feel and the relevance for the end customer. Most OEM's have their own so called 'steering feel DNA', describing their desired steering feel which is considered one of the main brand characteristics. For non-experts steering feel is very difficult to grasp, and actually to some extent this is even true for experts. Although in the last decades much effort has already been put in trying to objectify steering feel, it mainly remains a subjective evaluation criteria. Quite some information can be found in literature concerning objective measurements on steering feel and the human perception of steering feel, as well as on safety related allowable steering wheel torques and steering wheel torque levels for haptic warning and driver assist functions. This work however concentrates on the investigation into the human perception of a periodic sinusoidal steering wheel torque error with a certain frequency over steering wheel angle. This error state can be best compared with a ripple at the steering wheel which is caused by a periodic, over angle changing torque, generated for example by the electric motor in the steering system (e.g. cogging of motors using permanent magnets). By using a feedback actuator test bench with a basic steering feel model, and super-imposing this periodic error state on the base torque, the human perception of this error could be evaluated in the framework of a test person trial. Different configurations were investigated with in total n = 53 test persons covering a wide range of age and distributed between male and female. The main parameter to be tested was of course the amplitude of the sinus shaped torque irregularity. It was investigated what the threshold is where the error can be felt by the test person (perception threshold), and at which amplitude the test person found the error to be unacceptable (acceptance threshold). This was done for three different frequencies of the error state, with two different base torque levels and two different steering speeds. This way it was tempted to also understand the influence of the human perception based on the base torque level and the steering speed. With those results an evaluation could be made on the human perception of the error state in terms of tactile differentiation as well as customer acceptance, and a statistical analyses could be made to define the mean and deviation for the different investigated cases. The final goal of the work is to gain understanding of the subjective evaluation and perception of these error states and find objective metrics that correlate to the subjective evaluation. With this information the system validation and verification could be optimised, and it would be possible to define better system and component requirements and optimise the design in terms of costs and performance.


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    Titel :

    Investigation into the human perception of periodic torque fluctuations at the steering wheel


    Beteiligte:
    Polmans, Kristof (Autor:in) / Erler, Kay (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    16 Seiten, 15 Bilder, 2 Tabellen, 16 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




    Investigation into the human perception of periodic torque fluctuations at the steering wheel

    Polmans,K. / Erler,K. / ThyssenKrupp Presta Steering,DE | Kraftfahrwesen | 2013


    Modelling of steering wheel torque

    Pfeffer, Peter E. | Tema Archiv | 2006


    Modelling of steering wheel torque

    Pfeffer,P.E. / Univ.of Bath,GB | Kraftfahrwesen | 2006


    Second steering wheel senses torque

    Sensor Developments,Lake Orion,US | Kraftfahrwesen | 1981


    Investigation into steering wheel nibble

    Neureder, U | SAGE Publications | 2002