KR20090123497A - Automobile using a living body signal for the handicapped - Google Patents

Abstract

PURPOSE: A steering wheel operation system for a disabled person without an arm using electromyographic signals is provided to measure the electromyographic signals of the disabled person and program them to allow the disabled person to operate a steering wheel. CONSTITUTION: A steering wheel operation system for a disabled person without an arm using electromyographic signals comprises bipolar electrodes(01a,01b,11a,11b), a filtering unit, an A/D converter(21), and a microprocessor(22). The bipolar electrodes are attached to the neck, shoulder, and arm of the user to measure the electromyographic signals. The filtering unit creates necessary signals using the measured signals. The A/D converter changes the filtered analog signals to digital signals. The microprocessor processes the signals according to commands of the user.

Description

Steering system for a handicapped person using EMG signals {Automobile Using a living body signal for the handicapped}

The present invention is to manipulate the handle by using a bio-signal, so that the handle can be manipulated by receiving the bio-signal and programming the signal through filtering for a pure signal.

To manipulate the steering wheel, a person sends a signal from the brain to his arm. However, a person without an arm has a signal but cannot manipulate the handle because there is no muscle that can move with it. The voltage of the signal is 0.5 ~ 3mV and the frequency range is about 3 ~ 1000Hz. The present invention is an 8th order high-pass filter that cuts off unnecessary signals and noise to 10 ~ 500Hz by making it a voltage that can be amplified and driven. The 4th order low-pass filter is filtered to drive the handles.

Requires programming that can move at an angle depending on the magnitude of the measured representative value, not on / off

First of all, although the present invention can be sufficiently driven, complex coding is required if more detailed movement is required.

A disabled person without an arm can see the effect of being able to drive using the present invention.

Attach bipolar electrodes (01a, 01b, 11a, 11b) for measuring signals to both the neck and shoulder muscles of the user. The signal is measured when you try to move the arm. The signal comes from the left arm if you try to move the left arm, and from the right arm if you try to move the right arm. Of course, the signal may come out at the same time. 60 Hz notch filter (03, 13) for amplifying the measured signal (0.5 mV to 3 mV) 1000 times with the differential amplifiers (02, 12) and removing noise from the power supply part from the amplified signal. And a band pass filter (04, 14) passing only a band in the range of 10 Hz to 500 Hz. This signal is obtained through the analog switch element, and this signal is changed within + -2.5V according to the near conduction signal based on 2.5V. AT / 128 converter of ATmega128 operating at 5V is 0 ~ 5V. You can receive a range of signals. The analog signal of 0-5V is input and input to two channels of the A / D converter built in the microprocessor (ATmega 128) to be converted into digital signals of 0-1023 (21, 22). In this case, the signal processing is briefly explained that the analog signal of 0 ~ 5v is converted into the digital signal of 0 ~ 1023. Therefore, if 2.5V is the center value and the digital signal is also 512, the measured value is determined at regular intervals based on the center value. Obtain the absolute value of and select the maximum value among the values and use it as the representative value. This representative value is a value that determines the operation of the motor. Note that this representative value will be between 0 and 512. The representative value extracted by the microprocessor 22 is used to determine the operation of the motor. (On / off format)

Table 1

 When you only strengthen your right arm  Motor right turn  When the left arm is strong  Motor left turn  When both arms are deprived  Return to the center of the motor  When both arms are strong  Return to the center of the motor

 However, the motor can rotate only 1.5 laps left / right from the initial starting point (reference point, center) and the motor uses a stepping motor.

1 is a configuration diagram showing a procedure driven in the practice of the present invention

2 is an external view implemented in the practice of the present invention

Claims (6)

  Bipolar electrodes attached to neck, shoulder, and arm to measure user's EMG signal, filtering part to make this signal necessary signal, and A / D converter to convert analog signal into digital signal Microprocessor.   A differential amplifier for signal amplification included in the filtering section, a 60 Hz notch filter for power supply noise rejection of the amplified signal, an 8 th order high-pass filter and a 4 th order low pass banded at 10 to 500 Hz to obtain the required portion of the signal. Bandpass filter consisting of a -pass filter.   First, if the user's neck, shoulder, hand or elbow is lost, the signal measured by the pair of bipolar electrodes (01a, 01b, 11a, and 11b) is divided into two pairs from the arm to each side. Differential amplifiers (02,12) to amplify to 0.5V to 3V, notch filters (03,13) to remove 60Hz power supply noise from the amplified signal, and bandpass filters (04,14) to obtain the required signal from 10 to 500Hz A / D converter 21 for converting this filtered signal into a digital signal and a microprocessor 22 for recognizing the signal as a user desired command.  The microprocessor unit recognizes and stores the user's signal as a signal suitable for the command at the beginning, and drives it by comparing it with the initial data in receiving the signal at the time of execution.  The method of claim 3, wherein the absolute value of the signal is measured for a predetermined time interval based on the initially stored data, and the maximum value is selected as the representative value to drive the handle.  The method of claim 4, in the method of driving the representative value in the motor unit, the left rotation of the handle when the left arm tendon, the right is the right rotation, the middle when the force on both sides, the method of maintaining the center when not applied to both sides.  The stepping motor of claim 5, wherein the movement of the handle is limited to 1.5 wheels.

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