Reactive layer control system for prosthetic and orthotic devices
First Claim
1. A method of modifying feedback of an impedance controller, the method comprising:
- receiving, at the impedance controller, a first signal indicative of an interaction between a motorized prosthetic or orthotic apparatus and the ground, the apparatus including an actuator coupled to a prosthetic limb member, the actuator forming at least a portion of a joint of the apparatus;
receiving, at the impedance controller, a second signal indicative of torque at the joint;
based at least in part on the first signal, determining a torque feedback using the impedance controller, wherein during swing phase the impedance controller determines the torque feedback using at least the second signal and a first gain factor, wherein during stance phase the impedance controller determines the torque feedback using at least the second signal and a second gain factor that is different from the first gain factor; and
outputting a control signal to the actuator based at least in part on the torque feedback, wherein the actuator adjusts joint resistance to motion based at least in part on the control signal, wherein during the stance phase the control signal causes the actuator to increase the joint resistance to motion and during the swing phase the control signal causes the actuator to decrease the joint resistance to motion.
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Accused Products
Abstract
A variable gain impedance controller for use in a control system for controlling a motorized prosthetic or orthotic apparatus provided with a joint. The controller comprises a sensor input for receiving a signal indicative of an interaction between the apparatus and the ground, a torque sensor input for receiving a signal indicative of the torque at the joint, and a variable gain scheduler in communication with the sensor input to receive data therefrom thereby providing a variable torque gain. The variable gain impedance controller adjusts its control on the apparatus based on the variable torque gain and the indicated torque to increase the joint resistance to motion when the signal received from the sensor input indicates an interaction between the apparatus and the ground, and decrease the joint resistance to motion when the signal received from the sensor input indicates an absence of interaction between the apparatus and the ground.
394 Citations
18 Claims
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1. A method of modifying feedback of an impedance controller, the method comprising:
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receiving, at the impedance controller, a first signal indicative of an interaction between a motorized prosthetic or orthotic apparatus and the ground, the apparatus including an actuator coupled to a prosthetic limb member, the actuator forming at least a portion of a joint of the apparatus; receiving, at the impedance controller, a second signal indicative of torque at the joint; based at least in part on the first signal, determining a torque feedback using the impedance controller, wherein during swing phase the impedance controller determines the torque feedback using at least the second signal and a first gain factor, wherein during stance phase the impedance controller determines the torque feedback using at least the second signal and a second gain factor that is different from the first gain factor; and outputting a control signal to the actuator based at least in part on the torque feedback, wherein the actuator adjusts joint resistance to motion based at least in part on the control signal, wherein during the stance phase the control signal causes the actuator to increase the joint resistance to motion and during the swing phase the control signal causes the actuator to decrease the joint resistance to motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification