Fault Diagnosis and Fault-Tolerant Control of a Joystick-Controlled Wheelchair
Masafumi Hashimoto*, Yuuki Nakamura**,
and Kazuhiko Takahashi*
*Faculty of Science and Engineering, Doshisha University, 1-3 Miyakodani, Tatara, Kyotanabe, Kyoto 610-0321, Japan
**Chugai Technos Corporation, 2-14-2 Nakahiro-machi, Nishi-ku, Hiroshima 733-0012, Japan
This paper presents a method of fault diagnosis and fault-tolerant control for a nonholonomic powered wheelchair. Hard faults of sensors and actuators in two drive/steering units of the wheelchair are handled. The fault diagnosis is based on the interacting multiple-model (IMM) estimator. In order to improve fault decisions, we implement mode probability averaging and heuristic decision-making rule in the IMM-based algorithm. A fault-tolerant controller designed based on Ackerman geometry enables safe motion of the wheelchair even if sensors and actuators have partially failed. Experimental results verify the proposed method.
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