JP2009034140A - Fatigue warning method and fatigue warning device - Google Patents

Fatigue warning method and fatigue warning device Download PDF

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JP2009034140A
JP2009034140A JP2007198468A JP2007198468A JP2009034140A JP 2009034140 A JP2009034140 A JP 2009034140A JP 2007198468 A JP2007198468 A JP 2007198468A JP 2007198468 A JP2007198468 A JP 2007198468A JP 2009034140 A JP2009034140 A JP 2009034140A
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skin potential
driver
fatigue
warning
tired
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Toshiaki Sakurai
俊明 桜井
Miwako Sato
美和子 佐藤
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Alpine Electronics Inc
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Alpine Electronics Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fatigue warning method and a fatigue warning device, for detecting fatigue and drowsiness of a driver from a skin potential. <P>SOLUTION: This invention relates to the fatigue warning method for warning the fatigue by detecting whether or not the driver is tired from the skin potential and, wherein an electrode for skin potential measurement is embedded in a steering wheel of the driver, the skin potential between a palm and fingers of the driver who grips the steering wheel is measured, and a warning that the driver is tired is issued when a change speed of the measured skin potential changes for a prescribed period of time or longer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は疲労警告方法及び疲労警告装置に関わり、特に、皮膚電位により運転手が疲労しているか否かを検出して警告する疲労警告方法及び疲労警告装置に関する。   The present invention relates to a fatigue warning method and a fatigue warning device, and more particularly, to a fatigue warning method and a fatigue warning device for detecting whether or not a driver is fatigued by skin potential.

自動車安全装置は、受動的安全装置と能動的安全装置に大別することができる。受動的安全装置は事故が発生した時のダメージや負傷程度を軽減するものであり、能動的安全装置は積極的に運転手をして事故を起こさせないように支援するものである。高度道路交通システム（Intelligent Transport System ITS）の観点から多くの能動的安全装置の研究がなされてきた。そして、かかる能動的安全装置に関連して運転手の眠たさや疲労、居眠りについての研究が報告されている。   Automobile safety devices can be broadly divided into passive safety devices and active safety devices. A passive safety device reduces damage and the degree of injury in the event of an accident, and an active safety device helps to prevent a driver from actively causing an accident. Many active safety devices have been studied from the viewpoint of Intelligent Transport System ITS. In connection with such active safety devices, research on driver's sleepiness, fatigue, and dozing has been reported.

皮膚電位（skin potential level: SPL）とは掌と上腕部あるいは指先間に生じる電位差である。細胞内外の主な物質としてK+、Na+,CL-が存在し、細胞内外では、細胞膜により強制的にこれらの濃度差が作られ、細胞内外で受動輸送、能動輸送が起こり皮膚電位を生じる。この皮膚電位は皮膚間距離が５cm以上であれば測定でき、平常時と疲労時とで異なった測定結果が得られることが知られている。このため、皮膚電位測定用のハンディーな装置を運転手の腕や手に装着させて運転手の皮膚電位を測定する技術が提案されている（非特許文献１）。また、自動車のハンドルに皮膚電位測定用の電極を埋め込んで運転手の皮膚電位を測定する技術が提案されている（非特許文献２）。しかし、皮膚電位測定結果より疲労時を平常時から区別することは容易でなかった。
小島一雄，皮膚電位を用いた覚醒度検出装置の開発，第1回日本交通医学工学研究会学術総会，'92医学と工学からみた運転適正と安全対策，日本交通医学工学研究会，11~17，1992 吉田智行，桜井俊明，皮膚電流計測センサーの応用に関する研究，日本機械学会東北学生会第34回卒業研究発表講演論文集，155~156，2004 Skin potential level (SPL) is a potential difference generated between the palm and upper arm or fingertip. K + as the main material in the cell and out, Na +, CL - is present in the cell and out, forcing these density differences are made by a cell membrane, passive transport in cells and outside, resulting in skin potential occurs active transport . This skin potential can be measured when the distance between skins is 5 cm or more, and it is known that different measurement results can be obtained in normal times and during fatigue. For this reason, a technique for measuring a driver's skin potential by attaching a handy device for measuring skin potential to the driver's arm or hand has been proposed (Non-Patent Document 1). In addition, a technique for measuring the skin potential of a driver by embedding an electrode for measuring skin potential in a steering wheel of an automobile has been proposed (Non-Patent Document 2). However, it was not easy to distinguish fatigue from the normal from the skin potential measurement results.
Kazuo Kojima, Development of wakefulness detection device using skin potential, 1st Annual Meeting of Japan Traffic Medical Engineering Society, '92 Medical Driving Engineering Safety and Safety Measures, Medical Traffic Engineering Research Group, 11 ~ 17 , 1992 Tomoyuki Yoshida, Toshiaki Sakurai, Research on application of skin current measurement sensor, Proceedings of the 34th Graduation Research Presentation of the Japan Society of Mechanical Engineers, 155-156, 2004

以上から、本発明の目的は、皮膚電位より運転手の疲労や眠気を検出する方法および装置を提供することである。   In view of the above, an object of the present invention is to provide a method and apparatus for detecting driver fatigue and sleepiness based on skin potential.

・疲労警告方法
本発明の第１は皮膚電位により運転手が疲労しているか否かを検出して警告する疲労警告方法であり、自動車のハンドルに皮膚電位測定用の電極を埋め込むステップ、ハンドルを掴む運転手の掌と指間の皮膚電位を測定するステップ、該測定した皮膚電位の変化速度が略直線的に所定時間以上変化したとき、運転手が疲労しているものとして警告を発生するステップ、を有している。
上記警告ステップは、前記皮膚電位の変化速度が略直線的に所定時間以上変化するときの該皮膚電位信号をフーリエ変換してフーリエ変換結果を記憶しておき、疲労判定に際して、皮膚電位信号をフーリエ変換した結果と前記記憶されているフーリエ変換結果の相関を計算し、相関が設定値以上のとき運転手が疲労していると判定する。 Fatigue warning method The first of the present invention is a fatigue warning method for detecting whether or not a driver is fatigued by skin potential, and embeds an electrode for skin potential measurement in the handle of an automobile. A step of measuring the skin potential between the palm of the driver grasping the finger and a finger, and a step of generating a warning that the driver is fatigued when the change rate of the measured skin potential changes substantially linearly for a predetermined time or more. ,have.
In the warning step, the skin potential signal when the change rate of the skin potential changes approximately linearly for a predetermined time or more is Fourier-transformed to store a Fourier transform result. The correlation between the converted result and the stored Fourier transform result is calculated, and it is determined that the driver is tired when the correlation is equal to or greater than a set value.

・疲労警告装置
本発明の第２は皮膚電位により運転手が疲労しているか否かを検出して警告する疲労警告装置であり、自動車のハンドルに埋め込まれた皮膚電位測定用の電極を介してハンドルを掴む運転手の掌と指間の皮膚電位を測定する皮膚電位測定部、該測定した皮膚電位の変化速度が略直線的に所定時間以上変化したとき、運転手が疲労しているとして検出する疲労検出部、運転手が疲労していることが検出されたとき、警告を発生する警告部を備えている。
上記疲労検出部は、前記皮膚電位の変化速度が略直線的に所定時間以上変化するときの該皮膚電位信号をフーリエ変換してフーリエ変換結果を記憶する記憶部、疲労判定に際して、皮膚電位信号をフーリエ変換して出力するフーリエ変換部、該フーリエ変換した結果と前記記憶されているフーリエ変換結果の相関を計算し、相関が設定以上のとき運転手が疲労していると判定する判定部を備えている。 Fatigue warning device The second aspect of the present invention is a fatigue warning device that detects whether or not the driver is tired by skin potential, and warns the driver through an electrode for skin potential measurement embedded in the handle of an automobile. A skin potential measurement unit that measures the skin potential between the palm and finger of the driver holding the steering wheel, and detects that the driver is tired when the change rate of the measured skin potential changes approximately linearly over a predetermined time And a warning unit that generates a warning when it is detected that the driver is tired.
The fatigue detection unit is a storage unit that Fourier-transforms the skin potential signal when the change rate of the skin potential changes approximately linearly for a predetermined time or more, and stores the Fourier transform result. A Fourier transform unit that performs Fourier transform and outputs, and a determination unit that calculates a correlation between the result of the Fourier transform and the stored Fourier transform result, and determines that the driver is tired when the correlation is equal to or greater than a setting. ing.

本発明によれば、自動車のハンドルに皮膚電位測定用の電極を埋め込み、ハンドルを掴む運転手の掌と指間の皮膚電位を測定し、該測定した皮膚電位の変化速度が略直線的に所定時間以上変化したとき、運転手が疲労しているとして警告を発生するため、皮膚電位により運転手の疲労や眠気を検出することができる。
また、自動車のハンドルに皮膚電位測定用の電極を埋め込み、ハンドルを掴む運転手の掌と指間の皮膚電位を測定するようにしているから、運転手の手や腕に電極を取り付ける必要がない。 According to the present invention, an electrode for skin potential measurement is embedded in the handle of an automobile, the skin potential between the palm of the driver holding the handle and the finger is measured, and the change rate of the measured skin potential is determined approximately linearly. When the time changes for more than a time, a warning is generated that the driver is tired, so that the driver's fatigue and sleepiness can be detected by the skin potential.
In addition, the skin potential measurement electrode is embedded in the handle of the car, and the skin potential between the palm of the driver who holds the handle and the finger is measured, so there is no need to attach the electrode to the driver's hand or arm. .

（A）本発明の原理
３名の被験者A,B,Cについて、掌と指先に電極を装着し、これらの間の疲労時における皮膚電位Vを測定すると一例として図１に示す結果が得られた。これらの結果を用いて、その変化速度dV/dtを計算すると、図２に示すように測定開始後２１５〜２２０秒近辺で皮膚電位の変化速度dV/dtが５秒以上継続して略直線的に変化する傾向があることがわかった。この現象は、平常時や活動時には見られない傾向であり、したがって、皮膚電位の変化速度dV/dtが所定時間例えば５秒以上継続して略直線的に変化すれば運転手は疲労していると判定することができる。 (A) Principle of the present invention For three subjects A, B, and C, electrodes are attached to the palm and fingertips, and the skin potential V during fatigue between them is measured, and the result shown in FIG. 1 is obtained as an example. It was. Using these results, the rate of change dV / dt is calculated. As shown in FIG. 2, the rate of change dV / dt of the skin potential continues for about 5 seconds or more in the vicinity of 215 to 220 seconds after the start of measurement. It turns out that there is a tendency to change. This phenomenon does not tend to be seen during normal times or during activities. Therefore, if the skin potential change rate dV / dt changes substantially linearly for a predetermined time, for example, 5 seconds or more, the driver is tired. Can be determined.

（B）皮膚電位を測定するための電極構成
図３は運転手の皮膚電位を測定するための電極が埋め込まれたステアリングハンドルの説明図であり、（A）はステアリングハンドル部の平面図、（B）ステアリングハンドル部の一部断面図（図１（A）のAA′矢視図である）。
ステアリングハンドル部は環状部１とスポーク部２で構成され、環状部１は（B）に示すように断面円形になっており、中心部を形成する芯材１aと環状樹脂部１bで形成されている。この環状樹脂部１bの上側表面の運転手の掌があたる部分に塗布する銀／塩化銀の厚さに対応させ、数μの僅かな窪みを設け、その部分に銀／塩化銀を被着あるいは塗布して１枚の連続した細長い箔を形成し、この箔を基準電極（アース側）３aとしている。なお、図３では、説明上実際の寸法より遥かに深い窪みが示されている。また、環状樹脂部１bの下側表面の運転手の指があたる部分に、電極3aと同様に塗布する銀／塩化銀の厚さに対応させ、数μの僅かな窪みを設け、その部分に銀／塩化銀を被着あるいは塗布して１枚の連続した細長い箔を形成し、この箔を探査電極３ｂとしている。これら２つの電極３ａ，３ｂから運転手の運転時における皮膚電位を測定する。 (B) Electrode Configuration for Measuring Skin Potential FIG. 3 is an explanatory view of a steering handle in which an electrode for measuring a driver's skin potential is embedded, (A) is a plan view of the steering handle portion, B) A partial cross-sectional view of the steering handle (AA ′ arrow view of FIG. 1A).
The steering handle portion is composed of an annular portion 1 and a spoke portion 2, and the annular portion 1 has a circular cross section as shown in (B), and is formed by a core material 1a that forms a central portion and an annular resin portion 1b. Yes. Corresponding to the thickness of the silver / silver chloride to be applied to the portion of the upper surface of the annular resin portion 1b that corresponds to the palm of the driver, a slight depression of several μ is provided, and silver / silver chloride is applied to the portion. This is applied to form one continuous elongated foil, which is used as a reference electrode (ground side) 3a. In FIG. 3, a dent much deeper than the actual dimension is shown for explanation. In addition, in the portion where the driver's finger on the lower surface of the annular resin portion 1b hits, a slight depression of several μ is provided corresponding to the thickness of silver / silver chloride to be applied in the same manner as the electrode 3a. Silver / silver chloride is deposited or applied to form a continuous strip of foil, which is used as the exploration electrode 3b. The skin potential during driving of the driver is measured from these two electrodes 3a and 3b.

なお、ハンドル部の環状樹脂部１bの表面に電極を直接塗布あるいは被着してもよいが、電極の耐摩耗性、耐久性を高めるために僅かな溝があったほうがよい。窪みの深さは数μ程度（電極の塗布厚さと関係）、幅は数ミリから５mm程度で皮膚電位が検出可能な幅とする。この電極３a,３bの幅は一定でもよいが、変動するジグザグ塗布でもよい。また、図３（A）において、電極３a，３bが上部で切り欠かれているが一周連続でもよいし、二つ以上に分割されていてもよい。図３（C）に電極を２つに分割した例を示す。また、各電極３a，３bの素材は、耐久性があり、さびず、あせに強く、耐食性があるものが好適である。   Although the electrode may be directly applied or deposited on the surface of the annular resin portion 1b of the handle portion, it is preferable to have a slight groove in order to improve the wear resistance and durability of the electrode. The depth of the dent is about several μ (related to the application thickness of the electrode), the width is about several millimeters to 5 mm, and the width is such that the skin potential can be detected. The widths of the electrodes 3a and 3b may be constant, but may be changed zigzag coating. In FIG. 3A, the electrodes 3a and 3b are cut out at the upper part, but they may be continuous or may be divided into two or more. FIG. 3C shows an example in which the electrode is divided into two. Moreover, the material of each electrode 3a, 3b is durable, is resistant to rust, has a strong resistance to corrosion, and is suitable for corrosion resistance.

（C）疲労警告装置
図４は第１実施例の疲労警告装置の構成図である。
図４においてＡは掌Ｐと接触した基準電極３a（図３参照）の接触点、Ｂは指先Ｆと接触した探査電極３ｂ上の接触点、Ｌ１，Ｌ２は電極３ａ，３ｂ間の電圧を疲労警告装置１０に導くリード線である。疲労警告装置１０において、増幅器１１は測定される皮膚電位Vが低いため増幅して疲労検出部１２に入力する。疲労検出部１２において、皮膚電位変化速度検出部２１は皮膚電位信号Vが所定サンプリング間隔で入力する毎にAD変換し、前回のサンプリング値と今回のサンプリング値の差を皮膚電位変化速度dV/dtとして出力する。皮膚電位変化速度記憶部２２は例えば最近の５秒の間に計算された皮膚電位変化速度dV/dtを記憶し、直線判定部２３は、所定時間T（例えば５秒）、皮膚電位変化速度dV/dtが略直線的に変化するかチェックし、略直線的に変化すれば、運転手が疲労していると判定し、判定結果を疲労警告部１３に入力する。運転手が疲労していることを示す判定結果が入力されると、疲労警告部１３は音声によりあるいはブザーにより疲労警告を発生する。なお、dV/dtが正確に直線的に変化せず、値がばらつく場合には最小2乗法等を使用して直線性を判定する。 (C) Fatigue warning device FIG. 4 is a block diagram of the fatigue warning device of the first embodiment.
In FIG. 4, A is the contact point of the reference electrode 3a (see FIG. 3) in contact with the palm P, B is the contact point on the exploration electrode 3b in contact with the fingertip F, and L1 and L2 fatigue the voltage between the electrodes 3a and 3b. A lead wire leading to the warning device 10. In the fatigue warning device 10, the amplifier 11 is amplified and input to the fatigue detection unit 12 because the measured skin potential V is low. In the fatigue detection unit 12, the skin potential change rate detection unit 21 performs AD conversion every time the skin potential signal V is input at a predetermined sampling interval, and the difference between the previous sampling value and the current sampling value is converted to the skin potential change rate dV / dt. Output as. The skin potential change rate storage unit 22 stores, for example, the skin potential change rate dV / dt calculated during the last 5 seconds, and the straight line determination unit 23 stores the skin potential change rate dV for a predetermined time T (for example, 5 seconds). It is checked whether / dt changes substantially linearly. If it changes substantially linearly, it is determined that the driver is fatigued, and the determination result is input to the fatigue warning unit 13. When a determination result indicating that the driver is tired is input, the fatigue warning unit 13 generates a fatigue warning by voice or by a buzzer. If dV / dt does not change linearly accurately and the values vary, the linearity is determined using the least square method or the like.

図５は図３（C）に示すように電極３aを左右２つ３a1，３a2に分割した場合の第２実施例の疲労警告装置の構成図である。電極を２つに分割した場合は、２つの皮膚電位V1,V2が得られるため、疲労警告装置１０はそれぞれの皮膚電位V1,V2を増幅する２つの増幅器１１，１１′を備える。疲労検出部１２は例えば増幅器１１，１１′の出力を平均し、平均値を用いて図４の場合と同様の処理を行って運転手の疲労を検出する。あるいは、増幅器１１，１１′の出力のうち大きいほうを用いて図４の場合と同様の処理を行って運転手の疲労を検出する。
図４、図５の疲労警告装置は皮膚電位変化速度dV/dt を計算し、dV/dtが略直線的に変化する特性を検出しているが、dV/dtが所定時間（＝T）、略直線的に変化するときの疲労波形を保存しておき、実際の皮膚電位信号の入力波形と比較し、類似しているときに運転手が疲労していると判定することができる。 FIG. 5 is a configuration diagram of the fatigue warning device of the second embodiment when the electrode 3a is divided into two left and right 3a 1 and 3a 2 as shown in FIG. 3 (C). When the electrode is divided into two, two skin potentials V1 and V2 are obtained, so the fatigue warning device 10 includes two amplifiers 11 and 11 'that amplify the respective skin potentials V1 and V2. For example, the fatigue detection unit 12 averages the outputs of the amplifiers 11 and 11 ′ and performs the same processing as in FIG. 4 using the average value to detect driver fatigue. Alternatively, the driver's fatigue is detected by performing the same process as in FIG. 4 using the larger one of the outputs of the amplifiers 11 and 11 '.
4 and 5 calculates the skin potential change rate dV / dt and detects the characteristic that dV / dt changes substantially linearly. However, dV / dt is a predetermined time (= T), The fatigue waveform when it changes approximately linearly is stored, and compared with the input waveform of the actual skin potential signal, it can be determined that the driver is tired when they are similar.

図６は疲労波形と皮膚電位信号の入力波形の類似性より運転手が疲労していることを検出する第３実施例の疲労警告装置の構成図である。増幅器１１は皮膚電位信号Vを増幅して疲労検出部１２に入力する。疲労検出部１２のAD変換器３１は皮膚電位信号Vをディジタル値に変換し、FFT３２は時間領域の信号を周波数領域の信号に変換するもので、所定時間Tの間に発生する皮膚電位信号VのN個のサンプル値を入力され、N個の周波数成分を発生する。保存部３３は予め、疲労時におけるFFTの処理結果であるN個の周波数成分（疲労波形の周波数成分）を保存する。相関演算部３４は、疲労判定に際して、フーリエ変換部３２から出力される皮膚電位信号の周波数成分と保存部３３に保存されている疲労波形の周波数成分の相関を演算し、比較部３５は演算された相関と設定値を比較し、相関が設定値以上であれば運転手が疲労しているものと判定し、判定結果を疲労警告部１３に入力する。疲労警告部１３は運転手が疲労していることを示す判定結果が入力されると、音声によりあるいはブザーにより疲労警告を発生する。   FIG. 6 is a configuration diagram of the fatigue warning device of the third embodiment for detecting that the driver is fatigued based on the similarity between the fatigue waveform and the input waveform of the skin potential signal. The amplifier 11 amplifies the skin potential signal V and inputs it to the fatigue detection unit 12. The AD converter 31 of the fatigue detection unit 12 converts the skin potential signal V into a digital value, and the FFT 32 converts a time domain signal into a frequency domain signal, and the skin potential signal V generated during a predetermined time T. N sample values are input, and N frequency components are generated. The storage unit 33 stores in advance N frequency components (frequency components of a fatigue waveform) that are FFT processing results during fatigue. The correlation calculation unit 34 calculates the correlation between the frequency component of the skin potential signal output from the Fourier transform unit 32 and the frequency component of the fatigue waveform stored in the storage unit 33, and the comparison unit 35 calculates the fatigue. If the correlation is equal to or higher than the set value, it is determined that the driver is tired, and the determination result is input to the fatigue warning unit 13. When a determination result indicating that the driver is tired is input, the fatigue warning unit 13 generates a fatigue warning by voice or buzzer.

図４〜図６に示した増幅器１１及び疲労検出部１２はハンドル内に埋め込むことが望ましい。というのは、ハンドル内に埋め込むと電極3a,3bから増幅器１１までのリード線L1,L2の長さが長くならずノイズがのりにくくなるためである。また、疲労検出部１２から疲労警告部１３への配線は、ステアリングの中を通す。ステアリングに車載機操作用のリモコンを取り付けた場合、電源線、信号線、アース線の３本をステアリング内に配線するが、疲労検出装置も同様にステアリング内に配線する。
本発明によれば、自動車のハンドルに皮膚電位測定用の電極を埋め込み、ハンドルを掴む運転手の掌と指間の皮膚電位を測定し、該測定した皮膚電位の変化速度が略直線的に所定時間以上変化したとき、運転手が疲労しているものとして警告を発生するため、皮膚電位により運転手の疲労や眠気を検出することができる。
また、自動車のハンドルに皮膚電位測定用の電極を埋め込み、ハンドルを掴む運転手の掌と指間の皮膚電位を測定するようにしているから、運転手の手や腕に電極を取り付ける必要がない。すなわち、ハンドルを握るだけで皮膚電位を検出することができる。 The amplifier 11 and the fatigue detection unit 12 shown in FIGS. 4 to 6 are preferably embedded in the handle. This is because when embedded in the handle, the lengths of the lead wires L1 and L2 from the electrodes 3a and 3b to the amplifier 11 are not increased, and noise is difficult to travel. Further, the wiring from the fatigue detection unit 12 to the fatigue warning unit 13 passes through the steering. When the remote control for operating the vehicle-mounted device is attached to the steering, the power supply line, the signal line, and the ground line are wired in the steering, and the fatigue detection device is similarly wired in the steering.
According to the present invention, an electrode for skin potential measurement is embedded in the handle of an automobile, the skin potential between the palm of the driver holding the handle and the finger is measured, and the change rate of the measured skin potential is determined approximately linearly. When it changes over time, a warning is generated on the assumption that the driver is tired, so that the driver's fatigue and drowsiness can be detected by the skin potential.
In addition, the skin potential measurement electrode is embedded in the handle of the car, and the skin potential between the palm of the driver who holds the handle and the finger is measured, so there is no need to attach the electrode to the driver's hand or arm. . That is, the skin potential can be detected simply by grasping the handle.

疲労時における皮膚電位測定結果である。It is a skin potential measurement result at the time of fatigue. 皮膚電位の変化速度dV/dtが所定時間以上略直線的に変化することを示す測定結果説明図である。It is a measurement result explanatory drawing which shows that the change rate dV / dt of skin potential changes substantially linearly over a predetermined time. 運転手の皮膚電位を測定するための電極が埋め込まれたステアリングハンドルの説明図である。It is explanatory drawing of the steering handle in which the electrode for measuring a driver | operator's skin electric potential was embedded. 第１実施例の疲労警告装置の構成図である。It is a block diagram of the fatigue warning apparatus of 1st Example. 第２実施例の疲労警告装置の構成図である。It is a block diagram of the fatigue warning apparatus of 2nd Example. 第３実施例の疲労警告装置の構成図である。It is a block diagram of the fatigue warning apparatus of 3rd Example.

符号の説明Explanation of symbols

Ａ 掌Ｐと接触した基準電極３a上の接触点
Ｂ 指先Ｆと接触した探査電極３ｂ上の接触点
Ｌ１，Ｌ２ リード線
１０ 疲労警告装置
１１ 増幅器
１２ 疲労検出部
１３ 疲労警告部
２１ 皮膚電位変化速度検出部
２２ 皮膚電位変化速度記憶部
２３ 直線判定部 A Contact point on reference electrode 3a in contact with palm P Contact point L1, L2 on exploration electrode 3b in contact with fingertip F Lead wire 10 Fatigue warning device 11 Amplifier 12 Fatigue detection unit 13 Fatigue warning unit 21 Skin potential change rate Detection unit 22 Skin potential change speed storage unit 23 Straight line determination unit

Claims (4)

皮膚電位により運転手が疲労しているか否かを検出して警告する疲労警告方法において、
自動車のハンドルに皮膚電位測定用の電極を埋め込み、
ハンドルを掴む運転手の掌と指間の皮膚電位を測定し、
該測定した皮膚電位の変化速度が略直線的に所定時間以上変化するとき、運転手が疲労しているとして警告を発生する、
ことを特徴とする疲労警告方法。 In the fatigue warning method of detecting and warning whether the driver is tired or not by skin potential,
An electrode for skin potential measurement is embedded in the handle of an automobile,
Measure the skin potential between the palm and finger of the driver holding the handle,
When the change rate of the measured skin potential changes substantially linearly for a predetermined time or more, a warning is given that the driver is tired,
A fatigue warning method characterized by that. 前記皮膚電位の変化速度が略直線的に所定時間以上変化するときの該皮膚電位信号をフーリエ変換してフーリエ変換結果を記憶しておき、
疲労判定に際して、皮膚電位信号をフーリエ変換した結果と前記記憶されているフーリエ変換結果の相関を計算し、
相関が設定値以上のとき運転手が疲労していると判定する、
ことを特徴とする請求項１記載の疲労警告方法。 The skin potential signal when the change rate of the skin potential changes approximately linearly over a predetermined time is Fourier transformed to store the Fourier transform result,
At the time of fatigue determination, calculate the correlation between the Fourier transform result of the skin potential signal and the stored Fourier transform result,
When the correlation is equal to or higher than the set value, it is determined that the driver is tired.
The fatigue warning method according to claim 1. 皮膚電位により運転手が疲労しているか否かを検出して警告する疲労警告装置において、
自動車のハンドルに埋め込まれた皮膚電位測定用の電極を介してハンドルを掴む運転手の掌と指間の皮膚電位を測定する皮膚電位測定部、
該測定した皮膚電位の変化速度が略直線的に所定時間以上変化したとき、運転手が疲労しているとして検出する疲労検出部、
運転手が疲労していることが検出されたとき、警告を発生する警告部、
を備えたことを特徴とする疲労警告装置。 In the fatigue warning device that detects and alerts whether the driver is tired or not by skin potential,
A skin potential measuring unit that measures the skin potential between the palm of the driver and the finger that grips the handle via the electrode for skin potential measurement embedded in the handle of the automobile,
A fatigue detection unit for detecting that the driver is fatigued when the change rate of the measured skin potential changes substantially linearly for a predetermined time or more;
A warning section that generates a warning when it is detected that the driver is tired,
A fatigue warning device characterized by comprising: 前記疲労検出部は、
前記皮膚電位の変化速度が略直線的に所定時間以上変化するときの該皮膚電位信号をフーリエ変換してフーリエ変換結果を記憶する記憶部、
皮膚電位信号をフーリエ変換して出力するフーリエ変換部、
疲労判定に際して、該フーリエ変換した結果と前記記憶されているフーリエ変換結果の相関を計算し、相関が設定以上のとき運転手が疲労しているものと判定する判定部、
を備えることを特徴とする請求項３記載の疲労警告装置。 The fatigue detection unit
A storage unit for storing a Fourier transform result by Fourier-transforming the skin potential signal when the skin potential change rate changes substantially linearly for a predetermined time or more;
Fourier transform unit that outputs skin potential signal by Fourier transform,
At the time of fatigue determination, the correlation between the result of the Fourier transform and the stored Fourier transform result is calculated, and a determination unit that determines that the driver is tired when the correlation is equal to or higher than a setting,
The fatigue warning device according to claim 3, further comprising:
JP2007198468A 2007-07-31 2007-07-31 Fatigue warning method and fatigue warning device Pending JP2009034140A (en)

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WO2010128559A1 (en) * 2009-05-08 2010-11-11 富士通株式会社 Device for detecting the condition of an operator, and operating handle
CN110696718A (en) * 2019-10-17 2020-01-17 北京航空航天大学 Method for determining early warning time of automobile anti-collision early warning system based on skin electric reaction
JPWO2021106789A1 (en) * 2019-11-26 2021-06-03

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WO2010128559A1 (en) * 2009-05-08 2010-11-11 富士通株式会社 Device for detecting the condition of an operator, and operating handle
CN110696718A (en) * 2019-10-17 2020-01-17 北京航空航天大学 Method for determining early warning time of automobile anti-collision early warning system based on skin electric reaction
CN110696718B (en) * 2019-10-17 2020-12-08 北京航空航天大学 Method for determining early warning time of automobile anti-collision early warning system based on skin electric reaction
JPWO2021106789A1 (en) * 2019-11-26 2021-06-03
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JP7207839B2 (en) 2019-11-26 2023-01-18 Ｎｅｃソリューションイノベータ株式会社 DETECTION METHOD, DETECTION DEVICE, PROGRAM

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