Analysis of the Operation Abilities of Older Persons while Driving a Handle Type Electric Wheelchair and Proposal of the Operator Assistance System

为了明确老年人驾驶手柄式电动轮椅时不安全行为的原因，我们通过测量老年人在真实情况下驾驶电动轮椅时的视频图像数据来提取老年人的不安全行为，并测量与不安全行为原因相关的驾驶能力。结果发现，非确认行为是驾驶过程中最常见的不安全行为，老年人的注意力分散、有用视野和抑制能力均有所下降。因此，我们澄清了他们的成绩下降是受不确认行为等不安全行为的影响。然后，我们提出了避免与后方障碍物碰撞的驾驶员辅助系统。

To clarify the cause of older persons' unsafe behaviors while driving a handle type electric wheelchair, we extracted unsafe behaviors of older persons by measuring video image data while driving the electric wheelchair in the real situation and measured driving abilities that is relation with the cause of unsafe behaviors. As a result, we found that non-confirming behavior was the most number of unsafe behaviors while driving and that older persons' divided attention, the useful field of view and the inhibition performance were declined. Therefore, we clarified that their declined performance was influenced the unsafe behaviors such as non-confirming behavior. Then, we proposed the driver assistance system which avoids collisions with the obstacle that approached from the rear side.