The main purpose of this paper is to investigate the effectiveness of active suspension systems in the case that only rear suspension is controlled with a preview control method utilizing the future road surface roughness. The basic concept used is that the road surface which the rear wheels of a vehicle will travel, can be considered to be the time delayed replicas of that for the front wheels. Therefore, the concept of the disturbance observer is used to design an estimator which can estimate the road surface that the front wheels of a vehicle have travelled. The designed estimator is constructed with the force generated by a pneumatic cylinder and the suspension stroke detected with a gap sensor. From some experimental results, it was confirmed that the translational motion at the center of gravity and the rotational moetion can be suppressed with this preview control method.
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