Wheelchair electroencephalogram control device and control method

Wheelchair electroencephalogram control device and control method

  • CN 107,510,555 B
  • Filed: 08/31/2017
  • Issued: 06/05/2020
  • Est. Priority Date: 08/31/2017
  • Status: Active Grant
First Claim
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1. A wheelchair electroencephalogram control device is characterized in that:

  • the device comprises a color vision stimulator (6) for providing brain wave inducing signals for a user, an electroencephalogram signal acquisition device (1) for acquiring and preprocessing brain wave signals of a occipital lobe area of the brain of the user, a computer (2) for communicating with the electroencephalogram signal acquisition device (1) and a data processor (3) for communicating with the computer (2), wherein the data processor (3) is connected with a wheelchair control circuit (4) for controlling the controlled wheelchair to advance, retreat, turn left or turn right by adjusting the driving voltage of the controlled wheelchair and a display (5) controlled by the data processor (3), the wheelchair control circuit (4) comprises a driving module for driving the controlled wheelchair, a driving power supply for providing the driving voltage for the driving module and an analog switch which is connected with the output end of the data processor (3) and is used for gating the driving voltage, the color visual stimulator (6) comprises four color flash blocks, the four color flash blocks flash at different frequencies respectively, each color flash block flashes in a cross mode at two flash frequencies, the two flash frequencies on the same color flash block correspond to the same brain wave evoked signal, and the brain electrical signal acquisition device (1) comprises an electroencephalogram sensor, and an acquisition electrode, a reference electrode and a grounding electrode which are connected with the electroencephalogram sensor;

    the color vision stimulator(6) The middle position of the device is a watching focus of a user, four color flash blocks of the color vision stimulator (6) are respectively a first color flash block, a second color flash block, a third color flash block and a fourth color flash block, and the first color flash block uses frequency A1And frequency A2Cross flash, the second color flash block being at a frequency B1And frequency B2Cross-flashing, the third color flash block at a frequency D1And frequency D2Cross-flash, the fourth color flash block being at a frequency E1And frequency E2Cross flicker, frequency A1And frequency A2Flicker duration ratio, frequency B1And frequency B2Flicker duration ratio, frequency D1And frequency D2Flicker duration ratio and frequency E1And frequency E2The flicker time length ratios of the two groups are golden section ratios of 0.618;

    providing brain wave induction signals for eyes of a user through a color vision stimulator (6), then acquiring brain wave signals of occipital lobe areas of the brain of the user through an electroencephalogram signal acquisition device (1), acquiring the brain wave signals of the user in acquisition time t by the electroencephalogram signal acquisition device (1), synchronously transmitting the acquired brain wave signals to a computer (2), and storing the received brain wave signals into a brain wave signal database I by the computer (2), wherein the acquisition time t is not more than 10 seconds;

    the computer (2) calculates a brain wave frequency value C according to the received brain wave signal and transmits the brain wave frequency value C to the data processor (3), the data processor (3) converts the brain wave frequency value C into control information according to a frequency value interval in which the brain wave frequency value C is located, the analog switch gates different driving voltages according to different received control information, and the driving module drives the controlled wheelchair to move differently according to different driving voltages;

    the computer (2) adopts a DB4 wavelet function to carry out wavelet packet decomposition on the brain wave signals in the brain wave signal database I to obtain a wavelet packet energy spectrum, and selects the maximum energy value in the wavelet packet energy spectrum as the brain wave frequency value C;

    the EEG sensor is a chip TGAM1, an EEG pin of the chip TGAM1 is connected with the acquisition electrode, a REF pin of the chip TGAM1 is connected with the reference electrode, and an EEG _ GND pin of the chip TGAM1 is connected with the grounding electrode;

    an EEG pin of the chip TGAM1 acquires pillow center line potential of a occipital lobe area of the brain of a user, and a REF pin of the chip TGAM1 acquires brain wave potential of a frontal lobe area of the brain of the user;

    the driving power supply comprises a 3.3V voltage source for supplying power to a data processor (3), a bidirectional level conversion chip 74LVC4245A and a 3.7V analog voltage source connected with the data processor (3), a 2.4V analog voltage source and a 1.2V analog voltage source, the analog switches comprise a chip U1 with the model of CD4051 and a chip U2 with the model of CD4051, a 11 th pin of the chip U1 is respectively connected with the 3.7V analog voltage source and an A0 pin of the bidirectional level conversion chip 74LVC4245A, a 10 th pin of the chip U1 is respectively connected with a1 pin of the 2.4V analog voltage source and the bidirectional level conversion chip 74LVC 42A, a 9 th pin of the chip U1 is respectively connected with a2 pin of the 1.2V analog voltage source and a LVC4245 pin of the bidirectional level conversion chip 74LVC 42A, a 11 th pin of the chip U2 is respectively connected with a 3.7V analog voltage source and a voltage conversion chip LVC 74C, a2 pin of the bidirectional level conversion chip LVC 4248, and a chip LVC 4248 pin of the chip LVC 4248, the chip LVC chip U3626 is respectively connected with a2 pin of the chip LVC 4248 and the chip A 9 th pin of the chip U2 is connected to a 1.2V analog voltage source and an a5 pin of the bidirectional level conversion chip 74LVC4245A, an a0 pin, an a1 pin, an a2 pin, an A3 pin, an a4 pin, and an a5 pin of the bidirectional level conversion chip 74LVC4245A are connected to a PB0 pin, a PB1 pin, a PB2 pin, a PB3 pin, a PB4 pin, and a PB5 pin of the data processor (3), a 12 th pin of the chip U1 is connected to an X interface of the driving module, and a 12 th pin of the chip U2 is connected to a Y interface of the driving module.

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