The adaptive variable dampers with open-loop control can not give noticeable improvements in ride comfort while driving safety is still maintained on a level with the passive systems. The hydraulic active suspension systems are hardly acceptable because of their high power demand and increasing system complexity, and have difficulties in improving ride comfort and driving safety simultaneously by reducing the body accelerations and the dynamic wheel forces. Semi-active suspension systems with closed-loop control have advantages in reducing body motions at a relatively low cost as compared with hydraulic active suspensions. Multi-stage dampers or continuously variable dampers (CVD) are typically considered as the semi-active suspension system. In this paper, the semi-active control effects of CVD are evaluated realistically using the hardware-in-the-loop (HWIL) simulation technique, which are applicable more effectively to the early stage of developing semi-active suspension systems in comparison with computer simulation or prototype vehicle driving tests. In order to evaluate various control strategies in the wide range of damping forces, two CVD's have been manufactured experimentally using a hydraulic cylinder with proportional throttle valves and installed on the HWIL test stand. Two control methods, on/off and continuous sky-hook control, are applied to the expertmental CVD incorporated with the quarter-car model for real-time simulation. Also, the dynamic performance of a vehicle with the CVD is investigated on the HWIL test stand. It has been verified that a prominent control effect in ride comfort can be obtained by applying an extension of the conventional on/off sky-hook concept to the CVD system. However, the performance in driving safety is not improved as compared with the tuned passive damper system, and moreover, a partial performance degradation may occur when the control logic is applied to the CVD. This implies that the control logics of the unsprung mass should be considered together to utilize the CVD as semi-active variable damper system. The results in this paper are expected to contribute to developing an effective control logic of semi-active variable damper system for vehicles.


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    Titel :

    Vehicle dynamic analysis and evaluation of continuously controlled semi-active suspensions using hardware-in-the-loop simulation


    Beteiligte:
    Heo, S.J. (Autor:in) / Hwang, S.H. (Autor:in) / Lee, K.I. (Autor:in) / Kim, H.S. (Autor:in)


    Erscheinungsdatum :

    1996


    Format / Umfang :

    15 Seiten, 12 Bilder, 5 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch