パワーアシスト車椅子の後方転倒防止制御（その2）<br>-重心位置推定と位相平面に基づく可変アシスト比制御-

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タイトル別名
  • Novel Control Scheme of Power Assisted Wheelchair for Preventing Overturn (Part II)<br>-Variable Assistance Ratio Control Based on Estimation of Center-of-Gravity Angle and Phase Plane-
  • パワーアシスト車椅子の後方転倒防止制御(2)重心位置推定と位相平面に基づく可変アシスト比制御
  • パワーアシスト クルマイス ノ コウホウ テントウ ボウシ セイギョ 2 ジュウシン イチ スイテイ ト イソウ ヘイメン ニ モトヅク カヘン アシストヒ セイギョ

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Aged people and disabled people who have difficulty in walking are increasing. As one of mobility support, significance of a power assisted wheelchair which assists driving force using electric motors and spreads their living areas has been enhanced. However, the increased driving force often causes a dangerous overturn of wheelchair. This paper proposes a novel control method to prevent power assisted wheelchair from overturning.<br>The man-wheelchair system can be regarded as an inverse pendulum model when the front wheels are rising. The center-of-gravity (COG) angle of the model is the most important information directly-linked to overturn. Behavior of the system can be analyzed using phase plane as shown in this paper. The COG angle cannot be directly measured using a sensor, therefore, COG observer based on its velocity is proposed. On the basis of the analysis on phase plane, a novel control method with variable assistance ratio to prevent a dangerous overturn is proposed. The effectiveness of the proposed method is verified by the practical experiments on the flat ground and uphill slope.

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