Intelligent wheelchair system based on SSVEP (steady-state visual evoked potential)

Abstract

The invention discloses an intelligent wheelchair system based on SSVEP (steady-state visual evoked potential), and aims to solve the problems of high requirements on a user, less control commands and imperfect wheelchair functions of existing device during the process of using electroencephalogram to control a wheelchair. The intelligent wheelchair system comprises an LED strobe stimulator (1), an electrode cap (2), an electroencephalogram pre-processing circuit (3), a wireless transmission system (4), an upper computer (5), a wheelchair control circuit (6), an electric wheelchair (7), and an automatic obstacle avoidance module (8). Electroencephalogram signals collected by the electrode cap (2) are pre-processed through the electroencephalogram pre-processing circuit (3) and then are transmitted to the upper computer (5) through the wireless transmission system (4) to process and generate control signals, and the control signals are transmitted through the wireless transmission system (4) to the wheelchair control circuit (6) to control the wheelchair. The intelligent wheelchair system has the advantages of convenience in operation and safety in use, and can serve as an assisting tool for the old and the disabled.

Description

technical field [0001] The present invention relates to an intelligent wheelchair system based on SSVEP (steady-state visual evoked potentials), specifically refers to collecting the EEG signals generated when the user gazes at different frequency flickering stimuli, and judging the user's gaze by analyzing the specificity of the signals at different frequencies. Which frequency is the flickering, and to control the control system of the electric wheelchair. The invention is a combined application of the field of cognitive neuroscience and the field of electronic engineering technology, and belongs to the field of automatic control. Background technique [0002] At present, the problem of aging in the world, especially in developing countries such as China and India, is increasing day by day. Due to the decrease in the proportion of young people, the quality of life of the elderly is greatly reduced. Most of the elderly are inconvenient or unable to move independently. Looki...

AI Technical Summary

Problems solved by technology

[0004] 1) It requires high concentration and is not suitable for the elderly;

[0005] 2) The accuracy rate is low, and the online accuracy rate is about 85%;

[0006] 3) There are only two degrees of freedom left and right, and the control command is limited to two instructions;

[0007] 4) Large individual differences;

[0008] 5) The design of the wheelchair is not perfect, and the needs of the elderly and the disabled are not fully considered

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