Shared control for wheelchairs

08 January 2011

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To help aging populations with mobility, researchers are developing robotic wheelchairs. Typically, control switches between the user of the wheelchair and the robot when tasks become difficult or dangerous.

However, users sometimes become frustrated when losing control of the wheelchair and complete autonomy may lead to the patient losing certain capabilities (which are not practiced any more). Therefore, it is important to provide the right amount of help to the patient: no more, no less.

For this purpose, Urdiales et al. implement a control strategy where the robot and user continuously share control of the wheelchair. This is done by combining commands sent by the user using a joystick with commands computed by a potential field that ensures that the robot is repulsed from obstacles while being attracted to a goal. Both commands receive a weight based on how efficient the user and robot are at a given task. The resulting command is used to control the wheelchair.

The wheelchair, augmented with odometry and a frontal Hokuyo laser URG04-RX for localization and obstacle detection, was tested in a rehabilitation hospital by 30 users with different degrees of cognitive and physical disabilities. Users were asked to go through a door, proceed down a hallway, turn around in the hallway and come back. In other tests, users simply needed to go down a hallway.

All patients were successful at completing the navigation task using shared control. Furthermore, shared control improved performance of both the human and robot, helped patients learn how to use electric wheelchairs and avoided all collisions. Interestingly, shared control tends to equalize performance among patients with different disabilities, meaning the control is able to adapt to each patient’s needs.

In the future, Urdiales et al. plan on testing their system in more complex, human-like scenarios and with patients who have more severe disabilities.

Sabine Hauert is President of Robohub and Associate Professor at the Bristol Robotics Laboratory
Sabine Hauert is President of Robohub and Associate Professor at the Bristol Robotics Laboratory

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