JP2003061921A - Physical condition discriminating method and physical condition discriminating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily discriminate the physical condition of a human body whether the stress state, sleepy state or fatigue state. SOLUTION: This physical condition discriminating device 1 is formed by a pulse wave measuring means 2 for measuring pulse wave generated by blood circulation according to each flow of oxygen bearing hemoglobin and oxygen non-bearing hemoglobin to calculate a pulse value (Vp-Vp'), a high peak value (Vp) of each pulse wave, and a pulse pressure value (Vp-Vb) which is a difference between high and low peak values of the pulse waves, a discriminating means 8 for discriminating the states whether stress, sleepiness or fatigue as the physical condition according to the detection of change of the calculated values in one or more levels, and a warning output means 9 for outputting a warning according to the discrimination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Particularly, it belongs to the technical field of a physical condition determination method and a physical condition determination device for determining a physical condition related to human stress, drowsiness, and fatigue.

[0002]

2. Description of the Related Art Conventionally, in determining the physical condition of a human being,
It has been proposed to judge stress, drowsiness, and fatigue, and to judge the physical condition by these. Then, today, there is a demand for a technique of making such a determination with respect to the driver of the vehicle and calling the driver's attention to ensure safer driving. Something like this:
For example, as disclosed in Japanese Patent Application Laid-Open No. 9-255519, there is known one in which a driver's psychology and a stress state (tense state) are determined from changes in a pulse value (pulse rate), and drowsiness. As a method of determining the
Japanese Patent Laid-Open No. 6-251273, in which determination is made based on a pulse value and a respiratory rate as shown in Japanese Patent No. 2667.
As disclosed in Japanese Patent Laid-Open Publication No. 5-24460, and also based on changes in skin impedance as disclosed in Japanese Patent Laid-Open No. 5-24460. There is something I did.

[0003]

However, in the above-described stress determination, when it is attempted to make a determination based on the change in pulse value, it is difficult to distinguish between exercise and stress, and it is necessary to obtain a pulse value. There is a problem that the electrocardiographic measurement as a means is easily affected by a change in humidity and stable determination cannot be performed. Further, in the case where the determination of sleepiness is obtained from the measurement of the pulse value and the respiratory rate, clothes are put between the measuring device and the driver because the measurement is performed on the back part of the driver, and a measurement error is likely to occur. There's a problem.
Further, in the case of determining drowsiness based on the CCD measurement, there is a problem that the measurement target cannot be accurately captured and the error becomes large, and in the case of determining drowsiness based on the skin impedance, the skin impedance is However, there is a problem that it is difficult to make an accurate determination, and there is a problem to be solved by the present invention. Furthermore, when trying to determine these, it is necessary to attach electrodes to the skin, which causes a problem that it becomes troublesome and complicated, and there is also a problem to be solved here.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and the pulse wave generated by blood circulation is treated with oxygen-containing hemoglobin and oxygen. Measured based on each flow rate of unsupported hemoglobin, the pulse value, the high peak value of each pulse wave, and the pulse pressure value that is the difference between the high and low peak values of the pulse wave,
The physical condition is discriminated into a plurality of levels based on the detection of changes in these calculated values. And by doing in this way, a physical condition can be discriminate | determined finely. In this, the stress state as the physical condition of the present invention starts the discrimination as the pulse value increases, the detection that the increase amount of the pulse value exceeds a predetermined value, the increase or decrease amount of the pulse pressure value. Is judged to be low in stress level by any of the detection that the stress exceeds a predetermined value, and the detection of both, or the detection of either one and the increase or decrease of the pulse pressure value exceeding the predetermined value indicates that the stress level is medium. The determination can be made such that the stress level is determined to be high based on the detection of both of them and the detection that the increase / decrease amount of the pulse wave peak value exceeds a predetermined value. Further, in this, the drowsiness state as the physical condition of the present invention starts discrimination as the increase amount of the pulse pressure value exceeds a predetermined amount, and the decrease amount of the pulse value,
Detecting an increase in the high peak value and determining that the decrease in the pulse value exceeds a specified value determines that the sleepiness level is low.In this state, detecting that the decrease in the pulse value exceeds the specified value indicates that the sleepiness level is low. It is possible to set that the sleepiness degree is determined to be high by detecting that the increase amount of the high peak value exceeds a predetermined value in this state. Further, in this, the fatigue state as the physical condition of the present invention, a high peak value based on the actual flow rate measurement value of oxygen non-supported hemoglobin is calculated by dividing the high peak value based on the actual flow rate measurement value of oxygen-supported hemoglobin, The calculated value and the decrease amount of the pulse pressure value are detected, it is determined that the degree of fatigue is small by the detection that the calculated value exceeds the first predetermined value, and the detection that the calculated value exceeds the first predetermined value. When the decrease in pulse pressure value exceeds a predetermined amount, or when the calculated value exceeds a second predetermined value larger than the first predetermined value, it is determined that the degree of fatigue is in progress, and the calculated value is the first value. (2) It may be set so that it is determined that the degree of fatigue is large on the basis of the detection of exceeding the predetermined value and the detection of the decrease amount of the pulse pressure value exceeding the predetermined value. Furthermore,
In this, the stress state as the physical condition of the present invention starts the discrimination as the pulse value increases, the detection that the increase amount of the pulse value exceeds a predetermined value, the increase or decrease amount of the pulse pressure value. Is judged to be low in stress level by any of the detection that the stress exceeds a predetermined value, and the detection of both, or the detection of either one and the increase or decrease of the pulse pressure value exceeding the predetermined value indicates that the stress level is medium. It is determined that the stress level is high by detecting both of them and detecting that the increase / decrease amount of the pulse wave peak value exceeds the predetermined value, and the drowsiness state is accompanied by the increase amount of the pulse pressure value exceeding the predetermined amount. Start the determination, detect the decrease amount of the pulse value, the increase amount of the high peak value, and determine that the drowsiness level is low by detecting that the decrease amount of the pulse value exceeds a predetermined value, and in this state, the decrease amount of the pulse value is It is judged that the person is in a drowsiness level by detecting that the specified value is exceeded, and this state Increase of Oite high peak value is determined as drowsiness large degree by detecting that exceeds a predetermined value, fatigue state,
A high peak value based on the actual flow rate measurement value of oxygen-non-supported hemoglobin is calculated by dividing the high peak value based on the actual flow rate measurement value of oxygen-supported hemoglobin value, and the calculated value and the decrease amount of the pulse pressure value are detected. It is determined that the degree of fatigue is small by detecting that the calculated value exceeds the first predetermined value, detection that the calculated value exceeds the first predetermined value, and detection that the pulse pressure value decrease amount exceeds the predetermined amount, or When the calculated value exceeds the second predetermined value larger than the first predetermined value, it is determined that the degree of fatigue is in progress, and the detection that the calculated value exceeds the second predetermined value and the decrease amount of the pulse pressure value are It can be set so that it is determined that the degree of fatigue is high by detecting that the predetermined value is exceeded. Also,
The present invention is a physical condition determination device for measuring a pulse wave to calculate a pulse value and a pulse pressure value which is a difference between a high peak value of the pulse wave and a high peak value of the pulse wave. Measuring means for measuring each flow rate of hemoglobin and non-oxygenated hemoglobin, and from the measured pulse wave measurement value, each data of the pulse pressure value which is the difference between the high and low peak value of the pulse value and the blood pressure value and the pulse wave. A calculating means for calculating, a judging means for detecting a change in the calculated data and judging the physical condition into a plurality of levels, and an alarm output means for outputting an alarm corresponding to the level according to the judgment of the judging means. It is composed of. And by configuring in this way, easy,
And the pulse wave can be easily measured. In this case, the physical condition determining device of the present invention may be provided in a handle grip of a vehicle. Further, in this device, the physical condition determining device of the present invention may be provided at a portion of the handle grip that is frequently gripped by the driver. Also in this,
It is assumed that the physical condition determination device of the present invention is provided such that the measuring means is located at a site where the driver's hand grip with the handle grip has a high contact frequency and a site where the pulse wave detection intensity is high. be able to. Furthermore, in this one,
The alarm of the present invention may be composed of a voice output. Further, in this case, the alarm of the present invention may be configured by a hot heat output, a cold heat output, or the like, and may promote awakening. Further, in this case, the alarm of the present invention may be an alarm signal output to a control unit that controls driving of the vehicle. Further, in this device, the determined physical condition data of the present invention may be configured to be stored as a history in the drive recorder.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to FIG.
~ It demonstrates based on the drawing of FIG. In the drawings, 1
Is a physical condition discriminating apparatus in which the present invention is implemented, and the sensor portion (pulse wave measuring portion) of the pulse wave measuring means (pulse wave measuring unit) 2 constituting the physical condition discriminating apparatus 1 includes two light emitters ( The light-emitting elements 3 and 4 and one light-receiving element (light-receiving element) 5 which is arranged with a gap between the light-emitting elements 3 and 4 are linearly provided. In the present embodiment, each of the light emitters is a long wavelength light emitter 3 that emits infrared light having a light emission peak wavelength at 720 nm and a short wavelength light emitter 4 that emits infrared light having an light emission peak at 800 nm. Is set. Here, as hemoglobin in blood, there are those that carry oxygen and those that do not, oxygen-supported hemoglobin reflects infrared rays on the long wavelength side, hemoglobin that does not carry oxygen is infrared rays on the short wavelength side. It has a property of reflecting light, and corresponds to this. In the present embodiment, two light emitting diodes are used as each of the light emitting bodies 3 and 4. Incidentally, the number of light emitters can be adjusted according to the required detection accuracy. The bottom surface and the peripheral surface of the light emitting bodies 3 and 4 are covered with a reflection film (for example, a mirror-finished aluminum film) 3a and 4a so that infrared rays do not leak to the surroundings, so that they are injected into the human body. Consideration is given to increase the amount of infrared rays. Further, in this structure, the light emitting body 2 is arranged so as to be inclined so that the light emitting directions of the respective light emitting bodies 3 and 4 face the light receiving body 5 side, whereby the light density is increased and the detection accuracy is improved. .

On the other hand, the light receiving body 5 receives infrared rays, and in this embodiment, the photoelectric tube element of selenium cadmium sulfide is adopted, but a phototransistor can also be used. Then, in each of the emitted infrared rays, hemoglobin without oxygen support was reflected 680
The infrared ray of nm (short wavelength side) and the infrared ray of 900 nm (long wavelength side) reflected by hemoglobin carrying oxygen are set to be able to be specifically received. By the way, the pulse wave can be equated with the flow rate of blood flowing through the blood vessel, and further, it can be determined that there is a relative relationship with each flow rate of oxygen-carrying hemoglobin existing in blood, and oxygen-carrying hemoglobin, For this reason, the pulse wave measuring means 2 detects the pulse wave based on the amount of light received by the light receiver 5. Incidentally, the wavelength of the infrared rays emitted and received as long as the presence or absence of oxygen support of hemoglobin is specified,
It is not particularly limited to the above. Further, the light emitting / receiving bodies 3, 4, 5 are configured so that the tips for emitting and receiving light project so as to enter the skin, and by doing so, when the skin comes into contact with the site of the pulse wave measuring device 2, It is considered that the load on the light emitting / receiving bodies 3, 4, and 5 is increased to reduce the leakage of light, and the accuracy of measurement is improved. The pulse wave measuring means 2 is provided with an amplifying means 6 for processing the received measurement signal (analog signal) to form pulse wave data, and a data processing means 7 for processing the amplified pulse wave data. However, the data processing means 7 includes a converting means 7a for converting pulse wave data as an analog signal into a digital signal, and a difference between a pulse value, a blood pressure value and a high / low peak value of the pulse wave from the digital signal. It comprises a data calculating means 7b (corresponding to the calculating means of the present invention) for calculating a certain pulse pressure value, a memory means 7c for storing the calculated data calculated by the data calculating means 7b, and the like.

The data calculating means 7b calculates a pulse pressure value, which is the difference between the pulse value and the peak value of the high and low of the pulse wave, based on the pulse wave data obtained through the amplifying means 6. Is based on the signals from the respective light emitters 3 and 4.
It is made based on pulse wave data as shown in. That is,
The pulse value is the time between the peak values of the pulse wave ((Vp-V
The pulse pressure value is calculated as a difference value ((Vp-Vb) millivolts) obtained by subtracting the low peak value Vb from the high peak value Vp of the pulse wave data. Further, in the data calculation means 7b, the calculated values,
A calculated value based on pulse wave data to be input next, for each measured value of the high peak value VpL of the long wavelength side pulse wave and the high peak value VpS of the short wavelength side pulse wave as a numerical value corresponding to the blood pressure, and The measured values of the high peak values VpL and VpS of each pulse wave are respectively compared and calculated, and the calculated (calculated) values are output to the discrimination means 8.

Based on the detection of the data calculated by the data processing means 7, the discriminating means 8 has a plurality of physical states, specifically, three types of states of stress, drowsiness and fatigue. In the embodiment, it is set to discriminate at three levels. An alarm output unit 9 is connected to the determination unit 8, and when the determination unit 8 determines each physical condition state into a plurality of levels, the alarm output unit 9 determines that the determined level of each physical condition is different. It is set to output an alarm in a state in which can be distinguished.

Next, the change of the pulse wave with respect to each of the physical condition such as the stress state, the drowsiness state and the fatigue state will be examined. The pulse value is measured by using the pulse wave measuring device 2 for a subject who complains of each state. , A pulse pressure value (Vp-Vb) that is the difference between the high and low peak values of the long wavelength side pulse wave, and the high peak value Vp on the long wavelength side as a numerical value corresponding to the blood pressure value.
The L and high peak value VpS on the short wavelength side will be examined based on the measurement results obtained over time.

First, FIGS. 5 and 6 show the measurement results when four randomly selected subjects were in a stressed state and drowsiness state, respectively. The tendency of each measured value to change with time is shown by the direction of the arrow (upward arrow indicates an increasing trend, downward arrow indicates a decreasing tendency, and horizontal arrow indicates a small change). FIG. 5 shows the tendency of change in each measured value when each subject complains of weak irritability, when complaining of weak tension, and when complaining of strong tension. Then, according to FIG. 5, it can be seen that the pulse rate is increasing in any case when the irritability or tension occurs. Further, it can be seen that the increase and decrease tendencies of the pulse pressure value (Vp-Vb) tend to be reversed between the tension state and the frustrated state. Further, it can be seen that there is both a case where the high peak value VpL on the long wavelength side increases and a case where it decreases.

FIG. 6 shows the change tendency of each measured value in each state when each subject gradually complains of drowsiness, complains of strong drowsiness, fights drowsiness and then complains of drowsiness. It is the table figure shown. According to FIG. 6, it can be seen that the pulse pressure value (Vp-Vb) tends to increase when drowsiness occurs. Further, it can be seen that the pulse value tends to decrease in the state of complaining of drowsiness, and the pulse value tends to increase when fighting drowsiness. Further, it can be seen that the high peak value VpL on the long wavelength side is increasing although it is not as remarkable as the pulse.

FIG. 7 is a table showing the tendency of changes in measured values when fatigue is complained to a plurality of subjects.
According to FIG. 7, the peak value VpL on the long wavelength side and the peak value VbS on the short wavelength side are data with variations, and each subject does not show a certain tendency, but the short wavelength side The value ((ΔVpS / ΔVpL) value) obtained by dividing the change value (ΔVpS) of the peak value VbS by the change value (ΔVpL) of the peak value VpL on the long wavelength side is in an increasing trend and is in a state of feeling fatigue. (ΔVpS / ΔV
It has been found that the pL) value ranges from 0.007 to 0.19. Further, in the state of feeling fatigue, it was found that the amount of change in the pulse pressure value (Vp-Vb) also tended to decrease as a whole, and the amount of decrease, that is, the amount of decrease in the present detected value with respect to the previous detected value ( It was found that the reduction rate, which is obtained by dividing the difference between the previously detected value and the currently detected value by the previously detected value and multiplying by 100, is 20 to 48 percent (%).

Then, based on the examination and consideration results of the respective changing trends shown in FIGS. 5, 6 and 7, a stress discrimination procedure (stress discrimination procedure) is created by the discrimination means 8, and each physical condition is discriminated according to the procedure. The discrimination procedure will be described with reference to the flow charts of FIGS. First, when determining the stress state as a physical condition, the determination means 8 detects the pulse value to determine globally which state the physical condition is, and the increase amount of the pulse value (the previous value of the current detected value). It is determined whether or not the increase rate (relative to the detected value) is 5% (%) or more, and if 5% or more is detected, it is determined that the stress state is entered, and the mode is shifted to the stress determination mode. It is set to start the discrimination procedure in the mode. On the other hand, when the increase of the pulse value is less than 5%, the pulse pressure value (Vp-V
The increase amount of (b) (the increase ratio of the present detection value to the previous detection value) is detected, and the increase amount of the pulse pressure value (Vp-Vb) is 30.
% Or more, and if it is detected as 30% or more, it is determined that the person is in a drowsiness state, the drowsiness determination mode is entered, and the determination procedure in the mode is set to start. There is. When the increase amount of the pulse pressure value (Vp-Vb) is less than 30%, then (ΔVpS / ΔVpL)
The value is detected (calculated), and when the (ΔVpS / ΔVpL) value is detected to be 0.07 or more, it is judged that the tired state has occurred, the mode is shifted to the fatigue judging mode, and the judging procedure in the mode is started. Is set to. On the other hand, (ΔVp
If the amount of change in the (S / ΔVpL) value is less than 0.07,
It does not apply to any physical condition, it can be determined that there is no hindrance to the driving operation, and it is set to return to the initial setting state again.

Then, in the case of shifting to the stress discrimination mode, the discrimination means 8 detects the pulse value, and when the increase amount is 10% or more, it is stored as "stress level 1",
Then, the pulse pressure value (Vp-Vb) of the pulse wave is measured. on the other hand,
When the increase in the pulse value is 5% or more but less than 10%, it is determined that the person is beginning to feel stress but is not yet conscious of the stress, and the pulse pressure value (Vp-
Vb) is measured. Then, when the amount of change in the pulse pressure value (Vp-Vb) is reduced by 25% or more, the stress level 1 is further stored, and this is determined to be an irritating state. On the other hand, the change amount of the pulse pressure value (Vp-Vb) is 50
When it becomes larger than%, "stress level 1" is further stored and this is discriminated as a tense state. Then, the peak value VpL on the long wavelength side as a numerical value corresponding to the blood pressure is detected in each determined state, and the change amount of the high peak value VpL in the frustrating state (change rate of the present detected value with respect to the previous detected value) Is reduced by 5% or more, the stress level 1 is memorized, while the high peak value Vp
When L increases by 5% or more, "stress level 1" is set to be stored. Then, in this state, the memory of the stress level is counted, and if three stress levels are stored, it is determined as “high stress level”, and if two stress levels are stored, it is determined as “stress level”. If the stress level is memorized, it is determined as "low stress level", and the alarm output means 9
Is set to generate an alarm corresponding to each level, for example, a continuous electronic sound when the stress level is high, an intermittent electronic sound when the stress level is high, and a small electronic sound when the stress level is low.

On the other hand, when the mode shifts to the drowsiness discrimination mode, the discrimination means 8 detects the pulse rate and the amount of decrease in the pulse value is 5
If it is less than%, it is set to return to the initial setting state. On the other hand, when the amount of decrease in the pulse value is 5% or more, it is determined that "the degree of drowsiness is low", and a small electronic sound of a tone color different from that of the alarm in the stress is generated. Then, the pulse value is further detected from this state, and when the pulse value is reduced by 10% or more, it is determined to be "drowsiness level", and the alarm output means 9 is set to generate an intermittent electronic sound of the timbre. . By the way, when an effort is made to shake off drowsiness in the "low drowsiness" state, the pulse value tends to increase. Therefore, when the pulse value increases by 10% or more in the above state, it is determined that the drowsiness fighting is in progress. In this state, the progress of the pulse value is detected, and when the pulse value is reduced by 10% or more, it is set so as to be judged as "drowsiness level", and the alarm output means 9 generates an intermittent electronic sound of the same tone color as described above. Is set to. Then, in the state in which it is determined that "drowsiness level", subsequently, the high peak value VpL on the long wavelength side is detected, and the increase amount of the high peak value VpL becomes 5% or more, it is determined as "drowsiness level" The alarm output means 9 is set to generate a continuous electronic sound of the timbre.

Further, in the case of shifting to the fatigue discrimination mode, the (ΔVpS / ΔVpL) value is detected (calculated), and then the pulse pressure value (Vp-Vb) is detected. In that case,
(ΔVpS / ΔVpL) value is 0.07 or more and less than 0.14, and the amount of decrease in pulse pressure value (Vp-Vb) is 20%.
If it is less than, it is determined that the fatigue level is low, and (ΔVpS / Δ
VpL) value is 0.07 or more and less than 0.14, and
When the amount of decrease in the pulse pressure value (Vp-Vb) is 20% or more, it is set to determine that the fatigue level is in progress. Also,
When the (ΔVpS / ΔVpL) value is 0.14 or more and the reduction amount of the pulse pressure value (Vp-Vb) is less than 20%, it is determined that the degree of fatigue is medium and the (ΔVpS / ΔVpL) value is 0. .14 or more and the reduction amount of the pulse pressure value (Vp-Vb) is 20% or more, it is set to determine that the degree of fatigue is high. And also in this case, the degree of fatigue is small,
With the determination of medium or large, the alarm output means 9 produces an electronic sound according to the fatigue level, but in this case also, an electronic sound of a tone color different from the alarm sound for notifying the stress level and the drowsiness level, It is set to emit small electronic sounds, intermittent electronic sounds, and continuous electronic sounds.

Incidentally, in these discrimination procedures, when a timer is provided at an arbitrary position and a predetermined change cannot be found within the preset timer time, it can be set so as to return to the initial setting state. By doing so, it is possible to detect each physical condition over time, and promptly respond to each physical condition and output the necessary alarm.

The physical condition discriminating apparatus 1 thus constructed
Needs to be provided in a place where the physical condition of the driver can be measured over time. Therefore, in the present embodiment, the physical condition device 1 causes the vehicle to run straight as shown in FIG. In the steering position of the steering wheel grip HG, the steering wheel grip HG is provided at both left and right sides.
By the way, the grip of the handle grip HG will be examined, but in general, the driver grips the handle grip HG in a bilaterally symmetrical state. Then, the handle grip HG is shown in FIG.
As shown in (B), the upper part (so-called 12 o'clock grip)
As a part, an obliquely upper part (so-called 10:10 grip) as a part, a left and right part (so-called 9:15 grip) as a part, an obliquely lower part (so-called 4:40 grip) as a part, and a lower part (So-called orphan anti-grip)
As a result of investigating where a part with a high grip frequency is generally set, is shown as shown in FIG. 12 (A), a result that the frequency of gripping the parts on the left and right is close to about 50%. was gotten. From this result, in the present embodiment, the physical condition determination device 1 is provided at the handle grip HG.

Further, in the palm of the human hand holding the handle grip HG, the location where the detection intensity by the pulse wave measuring means 2 is high was examined. In this case, the ease with which the current passes through each part of the palm may be measured, and the results are shown in FIG. according to this,
The palm part has a comparatively low detection strength of about 8 to 15 mV, and 50 mV to 80 mV at the fingertip or the part on the wrist side.
The detection strength is high, and the base part of the finger is 2
It can be seen that the detection intensity is moderately high at 0 mV to 30 mV. On the other hand, the portions that are strongly pressed against the handle grip HG with the handle grip HG being gripped are the hatched portions A and B in FIG. 13, and a medium detection intensity is obtained at these portions. It is considered possible to obtain. Therefore, in the present embodiment, when the driver grips the region of the handle grip HG, the pulse wave measuring section of the pulse wave measuring unit 2 of the physical condition measuring device 1 is provided at the base of the finger that is strongly pressed against the handle grip HG. Light emitting / receiving body 3,
The physical condition measuring device is provided in a state where the 4 and 5 parts are located, and it is considered that it is easy to make a reliable physical condition determination.

In the embodiment of the present invention configured as described above, the physical condition determination device 1 determines the physical condition, but the pulse wave measuring means 2 of the physical condition determination device 1 changes the flow rate of hemoglobin carrying oxygen. , The change in the flow rate of hemoglobin without oxygen loading is measured based on the corresponding infrared transmission / reception, and these measured values are measured by the data processing means 7 at the high peak values (VpL, Vp) on the long wavelength side and the short wavelength side.
S) is used as a reference to calculate a pulse value ((Vp-Vp ') time), a pulse pressure value (Vp-Vb), and the like, and a physical condition is determined based on the calculated values. Then, in this case, the physical condition determination by the physical condition determination device 1 can determine the stress state, the drowsiness state, and the fatigue state corresponding to respective levels such as high stress level, medium stress, and low stress level. As a result, it is possible to provide detailed support. Further, in this one, when each physical condition is discriminated, an alarm corresponding to the level of each physical condition is appropriately notified,
It is possible to call for stepwise attention.

Further, the physical condition discriminating apparatus 1 of the present embodiment
Since the pulse wave measurement is performed by infrared irradiation, there is no trouble as in the case where the conventional electrode is adhered, and when the physical condition determination device 1 is attached to the steering wheel grip HG of the vehicle, the driver The pulse wave can be measured while operating the handle grip HG, and the physical condition can be easily discriminated during driving. Then, in this case, by mounting the physical condition determination device 1 on a portion of the handle grip HG that is frequently gripped by the driver, the physical condition of the driver can be observed over time. By doing so, it is possible to accurately and accurately determine the physical condition of the driver and notify the driver of the information, and to promote safer driving.

The present invention is not limited to the above-mentioned embodiment, and the warning by the warning output means is not limited to the electronic sound, the buzzer sound, or the voice such as voice, and the driver is warned. What is necessary is that it can be configured, for example, it can be configured to give vibration or cold heat to the driver, and it is more suitable as long as it wakes up the driver. Further, the output from the alarm output means may be configured to be used for vehicle running control, automatic braking, or the like. Further, a drive recorder may be mounted on the vehicle, and the determined physical condition data may be sequentially stored in the drive recorder and stored as a physical condition history.

[Brief description of drawings]

1A and 1B are respectively a front view and a side view showing a state in which a physical condition measuring device is attached to a handle grip.

FIG. 2 is a block diagram illustrating a physical condition determination device.

FIG. 3 is a schematic diagram illustrating a sensor portion of pulse wave measuring means.

FIG. 4 is a graph showing changes in pulse wave.

FIG. 5 is a table showing a change tendency of pulse wave measurement values in a stress state.

FIG. 6 is a table showing a change tendency of pulse wave measurement values in a drowsiness state.

FIG. 7 is a table showing a change tendency of pulse wave measurement values in a fatigue state.

FIG. 8 is a flowchart illustrating a physical condition determination procedure.

FIG. 9 is a flowchart illustrating a procedure for determining a stress determination mode.

FIG. 10 is a flowchart illustrating a procedure for determining a drowsiness determination mode.

FIG. 11 is a flowchart illustrating a procedure for determining a fatigue determination mode.

12A and 12B are a front view and a front view illustrating the grip frequency of a handle grip, respectively.

FIG. 13 is a schematic diagram illustrating a pulse wave detection intensity of a hand.

[Explanation of symbols]

1 Physical condition determination device 2 Pulse wave measuring means 3 luminous body 5 Photoreceptor 7 Data processing means 7b Data calculation means 8 discrimination means 9 Alarm output means

Claims (13)

[Claims] 1. A pulse wave generated by blood circulation is actually measured based on each flow rate of oxygen-supported hemoglobin and oxygen-non-supported hemoglobin, and the difference between the pulse value, the high peak value of each pulse wave, and the high and low peak value of the pulse wave. And a physical condition determination method for determining the physical condition as a plurality of levels based on the detection of changes in these calculated values. 2. The stress state as a physical condition according to claim 1, wherein discrimination is started as the pulse value increases,
It is judged that the stress level is low by detecting that the increase amount of the pulse value exceeds a predetermined value, or by detecting that the increase or decrease amount of the pulse pressure value exceeds a predetermined value, and either or both of them are detected. It is determined that the stress level is in progress by the detection of and the increase or decrease of the pulse pressure value exceeding a predetermined value, and the stress level is detected by the detection of both of them and the detection that the increase or decrease of the pulse wave peak value exceeds the predetermined value. A physical condition determination method that is set to determine that it is large. 3. The drowsiness state as a physical condition according to claim 1, wherein the determination is started when the increase amount of the pulse pressure value exceeds a predetermined amount, and the decrease amount of the pulse value and the increase amount of the high peak value are detected. However, it is determined that the drowsiness level is low by detecting that the amount of decrease in pulse value exceeds a predetermined value, and it is determined that the drowsiness level is being detected by detecting that the amount of decrease in pulse value exceeds the predetermined value. A physical condition discriminating method, which is set to discriminate that the sleepiness level is high when the increase amount of the peak value exceeds a predetermined value. 4. The fatigue state as a physical condition according to claim 1, wherein a high peak value based on a measured flow rate of oxygen-unsupported hemoglobin is divided by a high peak value based on a measured flow rate of oxygen-supported hemoglobin. Detecting the calculated value and the amount of decrease in the pulse pressure value, and determining that the degree of fatigue is small by detecting that the calculated value exceeds the first predetermined value, and detecting that the calculated value exceeds the first predetermined value. When the decrease in pulse pressure value exceeds a predetermined amount, or when the calculated value exceeds a second predetermined value that is larger than the first predetermined value, it is determined that the degree of fatigue is in progress, and the calculated value is A physical condition determination method set to determine that the degree of fatigue is high by detecting that the second predetermined value is exceeded and when the amount of decrease in pulse pressure value exceeds the predetermined value. 5. The stress state as a physical condition according to claim 1, wherein the determination is started as the pulse value increases,
It is judged that the stress level is low by detecting that the increase amount of the pulse value exceeds a predetermined value, or by detecting that the increase or decrease amount of the pulse pressure value exceeds a predetermined value, and either or both of them are detected. It is determined that the stress level is in progress by the detection of and the increase or decrease of the pulse pressure value exceeding a predetermined value, and the stress level is detected by the detection of both of them and the detection that the increase or decrease of the pulse wave peak value exceeds the predetermined value. It is determined to be large, and the drowsiness state starts to be discriminated when the increase amount of the pulse pressure value exceeds a predetermined amount, the decrease amount of the pulse value and the increase amount of the high peak value are detected, and the decrease amount of the pulse value is determined. It is judged that the drowsiness level is low when it exceeds the specified value, and that it is during the drowsiness level when the decrease amount of the pulse value exceeds the specified value in this state, and the increase amount of the high peak value is the specified value in this state. It is judged that the sleepiness level is high by the detection of exceeding the A value obtained by dividing the high peak value based on the actual measurement value of the flow rate of moglobin by the high peak value based on the actual measurement value of the flow rate of oxygen-carrying hemoglobin is calculated, and the calculated value and the decrease amount of the pulse pressure value are detected. It is determined that the degree of fatigue is small by the detection of exceeding the first predetermined value, the detection that the calculated value exceeds the first predetermined value, the detection that the pulse pressure value decrease amount exceeds the predetermined amount, or the calculated value. Is determined to be in the degree of fatigue by detecting that a second predetermined value that is larger than the first predetermined value is exceeded, the detection that the calculated value exceeds the second predetermined value, and the decrease amount of the pulse pressure value is a predetermined value. A physical condition determination method that is set to determine that the degree of fatigue is high based on detection of exceeding. 6. A physical condition determination device for measuring a pulse wave and calculating a pulse value and a pulse pressure value, which is a difference between a high peak value of the pulse wave and a high peak value of the pulse wave, is provided with oxygen carried by blood circulation. Measuring means for measuring the respective flow rates of hemoglobin and non-oxygen-bearing hemoglobin, and from the measured pulse wave measured values, each data of the pulse pressure value which is the difference between the pulse value, the blood pressure value and the high and low peak value of the pulse wave. A calculating means for calculating, a judging means for detecting a change in the calculated data and judging the physical condition into a plurality of levels, and an alarm output means for outputting an alarm corresponding to the level according to the judgment of the judging means. A physical condition determination device configured to include. 7. The physical condition determination device according to claim 6, wherein the physical condition determination device is provided on a handle grip of the vehicle. 8. The physical condition determination device according to claim 7, wherein the physical condition determination device is provided in a portion of the handle grip that is frequently gripped by a driver. 9. The physical condition determination device according to claim 7, wherein the measuring means is located at a portion where the driver's hand has a high contact frequency with the handle grip and a portion where the pulse wave detection intensity is high. Physical condition determination device. 10. The method according to claim 6, 7, 8 or 9,
An alarm is a physical condition determination device that is configured by voice output. 11. The method according to claim 6, 7, 8 or 9.
An alarm is a physical condition determination device that consists of hot and cold outputs, etc., and promotes arousal. 12. The method according to claim 6, 7, 8 or 9,
The alert is a physical condition determination device that is an alert signal output to the control unit that controls the driving of the vehicle. 13. The method according to claim 1, 2, 3, 4, 5, 6, 7,
The physical condition determination method or the physical condition determination device configured such that the physical condition data determined in 8, 9, 10, 11, 12 or 13 is stored in the drive recorder as a history.