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The driving simulator (DS) developed by Toyota Motor Corporation simulates acceleration using translational (XY direction) and tilting motions. However, the driver of the DS may perceive a feeling of rotation generated by the tilting motion, which is not generated in an actual vehicle. If the driver perceives rotation, a vestibulo-ocular reflex (VOR) is generated that results in an unnecessary correction in the driver's gaze. This generates a conflict between the vestibular and visual sensations of the driver and causes motion sickness. Although such motion sickness can be alleviated by reducing the tilting motion of the DS, this has the effect of increasing the amount of XY motion, which has a limited range. Therefore, it is desirable to limit the reduction in the tilting motion of the DS to the specific timing and amount required to alleviate motion sickness. However, the timing and extent of the VOR has yet to be accurately identified.

The adaptation of an active control suspension has remarkably improved the vehicle attitude and ride comfort characteristics. Such an active controlled suspension is controlled by actuators and hydro-dynamic equipments like servo valves. The control strategies are composed of feedback control with each cylinder oil pressure, suspension stroke and velocity. In the practical application of these systems, it must be taken into account that the effect of control is much dependent on the time delay of a controller as well as control elements. The object of this study is to confirm preview effects on the response of the system. The aim of preview feedforward control is to compensate the system delay of active control suspension. The control system is constructed of an ordinary feedback loop and a feedforward loop based on a road preview signal.