Abstract
As the population ages and fewer babies are born, both care-givers and persons who have necessity for being cared are currently ageing. Since it's important for both of them to be concerned with a local community, as one of the transfer aids, power assist wheelchairs are developed to help them to move. It is required that adjustment of the assist power is given due consideration in their safety and reducing burden to their body. Human adjusts assist power depending on walking velocity, so that we regard human, wheelchair as a prime motor, a load, and identify human-wheelchair's modeling system. In this paper, we describe the influence on assist power to human's behavior and an evaluation of wheelchair's driving performance.
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