Real time control device and control method by two-degrees-of freedom myoelectricity artificial hand

Abstract

The invention relates to a technology using the electromyography information to control the artificial hand. The existing hand with multiple degrees of freedom adopts the sequential control mode or the on-off switching mode to realize the control, which is lack of real-time performance and has bad bionic performance. The invention includes three electromyography electricity picking up sensors, connected with a last stage filtering and amplifying circuit, an A / D converting circuit, a SCM and two motors with two degree freedom electromyography artificial hand in order. The specific control method is: three electromyography electricity picking up sensors respectively collect the corresponding surface muscle electrical signal from the extensor carpi ulnaris, the flexor carpi ulnaris and the extensor digitorum of the human body, wherein the signals are inputted into the SCM after amplifying, filtering, A / D converting process; the SCM judges the intensity of the surface muscle electrical signal, and outputs the four-channel control signal, finally completes four actions of the artificial hand by the driving circuit to drive the motor of the artificial hand. The hand multiple movement mode identifying accurate rate of the invention can reach 100%, and realizes the real time control for the four actions of artificial hand having two degrees of freedom under the highly reliable recognition rate.

Description

technical field [0001] The invention belongs to the technical field of information and control, and relates to a technology for controlling an artificial hand with myoelectric information, in particular to a real-time control device and a control method for a two-degree-of-freedom myoelectric hand. Background technique [0002] Electromyography (EMG for short) is a bioelectrical signal accompanying muscle activity, which is the source of the electrical signal of muscle activity, which contains various information about muscle activity, including body movement patterns corresponding to muscle activity. Surface Electromyography (SEMG for short) is the combined effect of the EMG of the superficial muscles and the electrical activity of the nerve trunk on the skin surface. Because SEMG has non-invasive characteristics in measurement, it is painless and convenient for the individual being tested, and has been widely used in clinical medicine, sports medicine and many other fields...

AI Technical Summary

Problems solved by technology

After 2000, the recognition rate of multi-degree-of-freedom myoelectric prosthetic hand has reached more than 85%, but because there is still a certain rate of misrecognition, there is still a certain distance from practical use

Although this method can be used to realize the control of multi-free prosthetic limbs, it is not widely used in the market because of the disadvantages of inconvenient operation, lack of real-time performance and poor bionic performance.

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