KR20100063651A - Apparatus for measuring physiological signal of vehicles driver - Google Patents

Abstract

PURPOSE: A device for measuring a physiological signal of a driver is provided to safely measure a physiological signal without an obstruction when a vehicle travels using a conductive fabric electrode sensor. CONSTITUTION: A device for measuring a physiological signal of a driver comprises a conductive fabric electrode(210) and a signal generator. The conductive fabric electrode is spread on one of a wheel frame, a gear stick, an armrest, and a window frame in a vehicle. And the conductive fabric electrode senses a physiological current by being in contact with the body of a driver. The signal generator generates an electric signal corresponding to the physiological current.

Description

Vehicle signal measuring device for vehicle driver {APPARATUS FOR MEASURING PHYSIOLOGICAL SIGNAL OF VEHICLES DRIVER}

The present invention relates to a biosignal measuring apparatus of a vehicle driver, and more particularly, by applying a conductive cloth electrode sensor to a part touched by a driver in a vehicle, thereby preventing the vehicle driver from being conscious while the vehicle driver's hand is in contact. The present invention relates to a technology for measuring a driver's biosignal.

The present invention is derived from a study performed as part of the IT source technology development project of the Ministry of Knowledge Economy [task management number: 2006-S-007-03, task name: ubiquitous health care module system].

In general, monitoring the driver's heart condition while driving is significant in that it can actively induce safe driving as well as from the perspective of home health care, which is intended to monitor the driver's health in the long term. .

Recently, many researches and developments have been made on the technology for measuring the biosignal of a vehicle driver, and the biosignal measurement of the vehicle driver is a state in which the driver is not aware of the driver's health without directly conscious of or disturbing the driver. It is desirable to be able to measure at, and it is desirable that research and development be made in this direction.

The present invention, in order to solve the above problems, by applying a conductive cloth electrode to the part of the driver's hand in the vehicle to facilitate the contact between the driver's hand and the cloth electrode, to improve the contact feeling of the driver, the hand of the vehicle driver An object of the present invention is to provide a biosignal measuring apparatus for a vehicle driver, which enables the vehicle driver to measure a biosignal of a driver in an unconscious state during the contact.

According to an aspect of the present invention, there is provided an apparatus for measuring a biosignal of a vehicle driver, the apparatus including: a conductive cloth electrode applied to an object in a vehicle and contacting a body of a driver to sense a driver's biocurrent; And a signal generator configured to generate an electrical signal corresponding to the biocurrent.

On the other hand, the vehicle steering wheel according to another aspect of the present invention, the first conductive cloth electrode for contacting the left hand of the driver, and the second conductive cloth for electrically contacting the right hand of the driver and electrically separated from the first conductive cloth electrode A vehicle steering wheel coated with electrodes, the signal generating unit generating a bioelectrical signal of a driver corresponding to the biocurrent by sensing a bioelectric current of a driver through the first conductive cloth electrode and the second conductive cloth electrode.

According to the present invention, when the conductive cloth electrode is applied to the wheel frame of the vehicle, the contact between the driver's hand and the cloth electrode is facilitated and the driver's contact feeling is improved, so that the vehicle driver is conscious while the vehicle driver is holding the steering wheel. Since it is possible to measure the driver's bio-signals in the state that does not do, there is an effect that can measure the driver's bio-signals without disturbing driving.

In other words, by using a cloth electrode sensor made of a material that is electrically conductive, the cloth electrode can be applied to a large area of the wheel frame to facilitate contact between the driver's hand and the conductive cloth electrode. , Feel good to the driver. In addition, by using a portion of the conductive cloth electrode instead of the existing wire as a connection for transmitting an electrical signal it can simplify the manufacturing and configuration.

In addition, by implementing the interval suppression filter using the adaptive filter according to the engine speed (RPM), it is possible to effectively remove the external noise present in the measured biological signal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is not limited to the embodiments described, and the embodiments of the present invention are used to assist in understanding the technical spirit of the present invention. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

1 is a configuration diagram of a biosignal measuring apparatus of a vehicle driver according to an embodiment of the present invention. 2 is a configuration diagram of a conductive cloth electrode and a signal generator of a biosignal measuring apparatus according to an exemplary embodiment of the present invention.

1 and 2, the biosignal measuring apparatus according to the present exemplary embodiment may include a conductive cloth electrode 210 and a signal generator 220.

The conductive cloth electrode 210 is applied to the wheel frame to contact the driver's body to detect the driver's biocurrent, and is installed on the left handle of the wheel frame 110 to contact the driver's left hand. The first conductive cloth electrode 211 and the second conductive cloth electrode 211 are electrically separated from each other and are installed on the right handle portion of the wheel frame 110 to contact the right hand of the driver. ) May be included.

Each of the first and second conductive cloth electrodes 211 and 212 is coated on the wheel frame 110 and exposed to the outside to be in contact with the driver's hand, and is connected to the contact portion 210A. It may include a connecting portion 210B formed between the packaging material 115 applied to the wheel frame 110 and the wheel frame 110 and electrically connected to the signal generator 220.

As described above, in the biosignal measuring apparatus according to the present embodiment, the connection between the conductive cloth electrode 210 and the signal generator 220 is extended from the contact portion 210A of the conductive cloth electrode 210 without using a wire. The connected portion 210B can be used.

In FIG. 1, although the position of the signal generator 220 is not clearly illustrated, the signal generator 220 may be installed at the steering wheel center 120.

The first and second ceiling electrodes 211 and 212 configured as described above are coated on both sides of the wheel frame 110 of the steering wheel 100 in a state sufficiently electrically separated from each other, so that both hands of the vehicle driver Even if the position of the driver changes, the driver's bio signal can be measured. That is, when the vehicle driver grips both wheel frames 110 of the steering wheel 100, both hands of the driver come into contact with the cloth electrode 210 applied to both sides of the wheel frame 100, thereby generating the signal. The unit 220 may generate an electrical signal corresponding to the bioelectric current of the driver.

In this embodiment, the conductive cloth electrode 210 has been described as being applied to the wheel frame of the steering wheel, but the object to which the conductive cloth electrode 210 can be applied is not limited to the wheel frame, for example, The conductive cloth electrode 210 may be applied wherever a part of the driver's hand that can be maintained in the vehicle such as a gear stick, a window frame next to the driver's seat, or the like may be maintained for a predetermined time or more.

3 is a block diagram of an apparatus for measuring an electrocardiogram of a vehicle driver using a biosignal measuring apparatus according to an embodiment of the present invention.

Referring to FIG. 3, an electrocardiogram measuring apparatus of a vehicle driver according to the present embodiment includes a conductive cloth electrode 210 that is applied to a wheel frame 110 of a steering wheel 100 of a vehicle and senses a driver's biocurrent. The thousand electrode sensor 200 including a signal generator 220 for generating an electrocardiogram signal corresponding to the bioelectric current of the driver detected by the conductive thousand electrode 210 and the electrocardiogram received from the thousand electrode sensor 200. It may include an ECG processor 300 for processing a signal.

In this case, the electrocardiogram measuring apparatus of the vehicle driver of the present embodiment includes a power supply unit 50, and the power supply unit 50 may use a vehicle power source (vehicle battery) or a separate power source, and supply the required power supply voltage. Can be adjusted and supplied.

The ECG processor 300 may include an amplifier 310 to amplify the ECG signal from the cloth electrode sensor 210, and a filter 320 to remove noise included in the ECG signal from the amplifier 310. ), An A / D converter 330 for converting the ECG signal from the filter unit 320 into a digital signal, and an analyzer 350 for analyzing the digital ECG signal from the A / D converter 330. ) May be included.

The amplifier 310 amplifies the ECG signal from the signal generator 220. For example, an electrocardiogram signal of approximately 1 mV measured through the first and second conductive cloth electrodes 211 and 212 of the cloth electrode sensor 210 may have an amplification degree (eg, set by the amplifier 310). Amplification degree = 1000 times) is differentially amplified and output to the filter unit 320.

The filter unit 320 removes noise included in the ECG signal from the amplifier 310, and outputs the ECG signal from which the noise is removed to the A / D converter 330. Here, the filter unit 320 may pass, for example, an ECG signal corresponding to a frequency bandwidth of 0.01 Hz to 100 Hz among the ECG signals, and may remove noise of other frequency bands.

The A / D converter 330 converts the ECG signal from the filter unit 320 into a digital signal and outputs the digital signal to the analyzer 350. That is, the A / D converter 330 may binarize the analog ECG signal passing through the filter unit 320 and convert the analog ECG signal into a digital ECG signal (for example, 12 bits and 200 Hz).

The analyzer 350 analyzes the ECG signal of the vehicle driver by analyzing the digital ECG signal from the A / D converter 330.

4 is an exploded view of the packaging material of the conductive cloth electrode and the wheel frame in the biosignal measuring apparatus according to the exemplary embodiment of the present invention.

Referring to FIG. 4, in the biosignal measuring apparatus according to the present exemplary embodiment, the conductive cloth electrode 210 includes a contact portion 210A and a connection portion 210B as described above. When the conductive cloth electrode 210 of the present invention is applied to the wheel frame 110 and the packaging material 115 is coated on the conductive cloth electrode 210, the conductive cloth electrode 210 is the driver's hand. In order to expose the conductive cloth electrode 210 to the outside so as to be in contact with the outside, the packaging material 115 may have an open portion 115A open to a predetermined area.

Accordingly, the portion of the wheel frame 110 that is not coated with the conductive cloth electrode may be coated with a leather packaging material 115 used for the wheel frame 110, as shown in FIGS. 1 and 4. A portion of the conductive cloth electrode 210 is also covered by the packaging material 115 and thus is not exposed to the driver.

For example, the packaging material 115 includes an open portion 115A having a central hole, and dotted lines of the packaging material 115 of FIG. 4 when the packaging material 115 and the conductive cloth electrode 210 are overlapped with each other. Denotes an edge of the conductive fabric electrode 210.

In addition, the conductive cloth electrode 210 may be made in various ways by providing conductivity to the fibers organized with each other.

5 is a structure diagram of the first fiber and the second fiber of the conductive cloth electrode used in the biosignal measuring apparatus according to the embodiment of the present invention.

Referring to FIG. 5, the conductive cloth electrode 210 may be woven using a normal fabric and a conductive fabric having electrical conductivity.

For example, a method of weaving the conductive cloth electrode 210 may include a polyester yarn having a filament or a staple structure and a metal such as silver which does not cause trouble on the skin and has good electrical conductivity. It can be used a variety of methods, such as a method of weaving the coated fiber to a tricot (Tricot), knit, or knitting method to maintain a proper elasticity.

6 is a view in which a conductive cloth electrode and a filler between wheel frames are inserted in a biosignal measuring apparatus according to another exemplary embodiment of the present invention.

Referring to FIG. 6, the biosignal measuring apparatus is inserted between the wheel frame 110 and the conductive cloth electrode 210 to improve the contact feeling when the driver contacts the conductive cloth electrode. The fabric electrode 210 may further include an elastic filler 230 that facilitates contact between the driver and the driver's hand.

Using such a flexible filler 230, it is possible to facilitate the contact between the wheel frame 110 of the steering wheel 100 and the palm of the driver holding it.

7 is a diagram in which an adaptive filter unit is added to an ECG processor in a biosignal measuring apparatus according to another exemplary embodiment of the present invention.

Referring to FIG. 7, the ECG processor according to the present embodiment may further include an adaptive filter unit 340 between the A / D converter 330 and the analysis unit 350, and in this case, the adaptive filter. The unit 340 may remove the background noise v from the digital ECG signal from the A / D converter 330.

8 is a detailed configuration diagram of the adaptive filter unit illustrated in FIG. 7.

Referring to FIG. 8, the adaptive filter unit 340 may include a rotational noise generator 341, an adaptive filter 342, and a subtractor 343.

In this case, the speed noise generator 341 may generate a speed noise signal r corresponding to the engine speed of the vehicle and output the generated speed noise signal r to the adaptive filter 342.

The adaptive filter 342 is driven by the rotational noise signal r from the rotational noise generator 341 to reduce background noise included in the digital electrocardiogram signal from the A / D converter 330. The virtual background noise v may be generated and output to the subtractor 343. The subtractor 343 subtracts the virtual background noise from the adaptive filter 342 from the digital electrocardiogram signal from the A / D converter 330. Through this process, the background noise included in the ECG signal may be removed.

In other words, the background electrocardiogram (V) generated by the vehicle is mixed with the ECG signal. At this time, the background noise (v) is a vibration and electrical noise mainly generated according to the rotational speed of the engine has the same frequency characteristics as the engine speed (RPM). For example, if the engine rotates at 3000 rpm, 50 Hz of background noise is mixed into the ECG signal. The engine speed can be provided from the vehicle or the frequency can be found by measuring the measured ECG signal. Once the engine speed (RPM) is given, the background noise v may be removed using the adaptive filter unit 340.

Here, the adaptive filter unit 340 adjusts the size of the virtual background noise according to the degree of elimination of the background noise included in the ECG signal, instead of using a band stop filter having a fixed pass band. Implemented as a filter, it is possible to efficiently remove the background noise caused by the variable engine rotation.

Accordingly, the signal quality of the binary ECG signal input to the analyzer 350 may be improved while passing through the adaptive filter unit 340.

For example, if the engine is running at 3000 rpm, the speed noise generator 341 generates a speed noise that is a sine wave of 3000/60 = 50 Hz, and then outputs it to the measured ECG signal through the adaptive filter 342. Implement virtual background noise (rmhatv) that corresponds to mixed background noise (v). Subsequently, the subtractor 343 subtracts background noise from the ECG signal to output an ECG signal from which the background noise is removed. The adaptive filter 342 may be updated to minimize background noise in the ECG signal.

Here, in order to quickly adapt to a change in engine speed, the adaptive filter may be updated using Recursive Least Square (RLS) instead of Least Mean Square (LMS).

을 최소화하기 위한 목적함수를 '

'라고 정의하면, 이를 최소화시키는 적응필터(342)의 가중치를 갱신시키는 방법은 다음 단계와 같다.Meanwhile, referring to an embodiment of a noise cancellation algorithm using a recursive least square (RLS) method, in FIG. 6 and FIG. 7, when the adaptive filter 342 of the present invention is designed as an FIR filter, the adaptive of the present invention is adapted. Output from the filter unit 340

To minimize the objective function

', The method of updating the weight of the adaptive filter 342 to minimize this is as follows.

)를 하기 수학식 1과 같이 계산한다. Step 1: The signal s (n) from the A / D converter 330, the preset previous weight w (n-1), and the rotation speed from the rotation noise generator 341 By using the noise signal r, the ECG signal from which the background noise is removed

) Is calculated as in Equation 1 below.

)를 계산한다.Step 2: Using the inverse matrix of the initial unit matrix R (n) and the rotational noise signal r, a gain vector (Equation 2)

Calculate

)을 다시 계산한다.Step 3: By using the inverse matrix IR (n-1) of the previous unit matrix R (n-1) and the rotational noise signal r, IR (n) (

Recalculate).

)를 계산한다.Step 4: Transfer weight of the applied filter (

Calculate

)을 계산한다.Step 5: The weight (

).

Step 6: The electrocardiogram signal RMHAT {ECG from which the background noise is removed as shown in Equation 6 using the signal s (n) from the A / D converter 330 and the virtual background noise r mhatv. } (n) is calculated.

Step 7: When the next data comes in, the process is repeated with step 1 above.

는 상기 회전수 잡음 생성부(341)에서 출력되는 회전수 잡음의 벡터이고,

는 적응필터(342)의 게인의 벡터이고,

는 상기 적응필터(342)의 가중 계수의 벡터이며,

에서 T는 전치행렬(Transpose)을 의미한다.here,

Is a vector of rotational noise output from the rotational noise generator 341,

Is a vector of gain of the adaptive filter 342,

Is a vector of weighting coefficients of the adaptive filter 342,

Where T is the transpose.

9 is a diagram in which a transmitter is added to a processor of a biosignal measuring apparatus according to another exemplary embodiment of the present invention.

As shown in FIG. 9, in the biosignal measuring apparatus of the vehicle driver according to the present embodiment, the processor may further include a transmitter 400, and in this case, the transmitter 400 may include an analyzer ( Analysis information of the biosignal by 350 may be transmitted to an external device.

Here, the external device may be an external display device such as a navigator. For example, when a navigator is connected to the transmission unit 400, the bio signal of the driver measured by the present invention is output through the navigator. Can be. According to the present embodiment, while the driver is not aware while driving, the bio signal of the driver can be measured and analyzed, and the result can be output. That is, the analysis result output from the biosignal measuring apparatus may be output to the screen display apparatus or the navigation system mounted on the vehicle, and the driver may be notified of this.

According to the present invention as described above, by using a fabric electrode sensor made of a conductive fabric material, it is possible to apply the sensor to a large portion of the wheel frame to contact between the driver's hand and the fabric electrode sensor. It is possible to provide a bio-signal measuring device of the vehicle driver to smooth the, and to improve the user's tactile feeling.

1 is a block diagram of a biosignal measuring apparatus according to an embodiment of the present invention.

2 is a configuration diagram of the cloth electrode and the signal generator in the biosignal measuring apparatus according to the exemplary embodiment of the present invention.

3 is a block diagram of an electrocardiogram measuring apparatus using a biosignal measuring apparatus of a vehicle driver according to an embodiment of the present invention.

4 is an exploded view of the packaging material of the conductive cloth electrode and the wheel frame in the biosignal measuring apparatus according to the exemplary embodiment of the present invention.

5 is a structure diagram of the first fiber and the second fiber of the conductive cloth electrode in the biological signal measuring apparatus according to an embodiment of the present invention.

6 is a view in which a conductive cloth electrode and a filler between wheel frames are inserted in a biosignal measuring apparatus according to another exemplary embodiment of the present invention.

7 is a diagram of an adaptive filter added in a biosignal measuring apparatus according to another exemplary embodiment of the present invention.

8 is a block diagram of an adaptive filter unit used in a biosignal measuring apparatus according to still another embodiment of the present invention.

9 is a diagram in which a transmission unit is added in a biosignal measuring apparatus according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: steering wheel 110: wheel frame

200: cloth electrode sensor 210: conductive cloth electrode

211: first conductive cloth electrode 212: second conductive cloth electrode

210A: contact portion 210B: connection portion

220: signal generator 230: filler

300: ECG processor 310: amplification unit

320: filter unit 330: A / D conversion unit

340: adaptive filter unit 341: rotational noise generator

342: adaptive filter 343: subtractor

350: analysis unit 400: transmission unit

Claims (20)

A conductive cloth electrode applied to a target object in the vehicle and contacting the driver's body to sense a driver's biocurrent; And Signal generator for generating an electrical signal corresponding to the biocurrent Biological signal measuring apparatus of a vehicle driver comprising a. The method of claim 1, The conductive cloth electrode is a biosignal measuring apparatus of a vehicle driver, characterized in that applied to any one or more of the wheel frame, gear stick, armrest next to the driver's seat and the window frame next to the driver's seat. The method of claim 1, wherein the conductive cloth electrode, A first conductive cloth electrode for contacting the left hand of the driver; And The second conductive cloth electrode is electrically separated from the first conductive cloth electrode and is in contact with the driver's right hand. Biological signal measuring apparatus of a vehicle driver comprising a. The method of claim 3, wherein each of the first and second conductive cloth electrodes, A contact part exposed to the outside and in contact with a driver's hand; And A connection part connected to the contact part and formed between the packaging material coated on the object and the object, and electrically connected to the signal generation part Biological signal measuring apparatus of a vehicle driver comprising a. The method of claim 1, The conductive cloth electrode is a biological signal measuring apparatus of a vehicle driver, characterized in that the woven fabric using a conductive fabric having a conductive and electrical conductivity. The method of claim 1, An elastic filler inserted between the object and the conductive cloth electrode to facilitate contact between the conductive cloth electrode and the driver's hand. The biosignal measuring apparatus of a vehicle driver further comprising a. The method of claim 1, Processor for processing the electrical signal generated by the signal generator The biosignal measuring apparatus of a vehicle driver further comprising a. The method of claim 7, wherein The signal generator generates an electrocardiogram signal of the driver corresponding to the biocurrent, And the processor is an electrocardiogram processor for processing the electrocardiogram signal. The ECG processor of claim 8, wherein An amplifier for amplifying the ECG signal from the signal generator; A filter unit for removing noise included in an electrocardiogram signal from the amplifier; An A / D converter converting the ECG signal into a digital signal from the filter unit; And An analyzer for analyzing the digital electrocardiogram signal from the A / D converter Biological signal measuring apparatus of a vehicle driver comprising a. The ECG processor of claim 9, wherein Adaptive filter unit for removing background noise from the digital electrocardiogram signal from the A / D converter The biosignal measuring apparatus of a vehicle driver further comprising a. The method of claim 10, wherein the adaptive filter unit, A speed noise generator configured to generate a speed noise signal corresponding to the engine speed of the vehicle; An adaptive filter for generating virtual background noise using the rotational noise signal from the rotational noise generator to reduce the background noise included in the digital electrocardiogram signal from the A / D converter; And A subtractor for subtracting the virtual background noise from the adaptive filter from the digital electrocardiogram signal from the A / D converter. Biological signal measuring apparatus of a vehicle driver comprising a. The method of claim 7, wherein Transmitter for transmitting the analysis information of the biological signal by the processor to an external device The biosignal measuring apparatus of a vehicle driver further comprising a. A vehicle steering wheel coated with a first conductive cloth electrode for contacting a driver's left hand and a second conductive cloth electrode for electrically contacting the driver's right hand and electrically separated from the first conductive cloth electrode, And a signal generation unit configured to generate a bioelectrical signal of the driver corresponding to the biocurrent by sensing the bioelectric current of the driver through the first conductive cloth electrode and the second conductive cloth electrode. The method of claim 13, wherein each of the first and second conductive cloth electrodes, A contact part exposed to the outside and in contact with a driver's hand; And A connection part connected to the contact part and formed between the packaging material applied to the wheel frame of the vehicle steering wheel and the wheel frame of the vehicle steering wheel, and electrically connected to the signal generator; Vehicle steering wheel comprising a. The method of claim 13, The first and second conductive cloth electrodes, the vehicle steering wheel, characterized in that weaving using a conductive fabric having a conductive cloth having electrical conductivity with the normal fabric. The method of claim 13, An elastic filler is inserted between the wheel frame of the vehicle steering wheel and the conductive cloth electrode to facilitate contact between the conductive cloth electrode and the driver's hand. Vehicle steering wheel further comprising a. The method of claim 13, The signal generator generates an electrocardiogram signal of the driver corresponding to the biocurrent, An ECG processor for processing the ECG signal Vehicle steering wheel further comprising a. The ECG processor of claim 17, wherein An amplifier for amplifying the ECG signal from the signal generator; A filter unit for removing noise included in an electrocardiogram signal from the amplifier; An A / D converter converting the ECG signal into a digital signal from the filter unit; And An analyzer for analyzing the digital electrocardiogram signal from the A / D converter Vehicle steering wheel comprising a. The ECG processor of claim 18, wherein Adaptive filter unit for removing background noise from the digital electrocardiogram signal from the A / D converter Vehicle steering wheel further comprising a. The method of claim 19, wherein the adaptive filter unit, A speed noise generator configured to generate a speed noise signal corresponding to the engine speed of the vehicle; An adaptive filter for generating virtual background noise using the rotational noise signal from the rotational noise generator to reduce the background noise included in the digital electrocardiogram signal from the A / D converter; And A subtractor for subtracting the virtual background noise from the adaptive filter from the digital electrocardiogram signal from the A / D converter. Vehicle steering wheel comprising a.

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