JPH08103430A - Human body detector - Google Patents

Abstract

PURPOSE: To detect the presence of a person in a short time even when the signal of the person is small by processing the signal of a bodily action detecting means and judging the presence/absence of the person by using a time measuring means in a human body detector which detects the presence/absence of the person on equipment with which the person is supported such as a seat and a bed. CONSTITUTION: The bodily action detecting means 1 consisting of a piezoelectric element. etc., is provided on the seat part of the seat 5, and vibration by the bodily action of a human body when sitting on the seat 5. etc., is outputted by converting into an electrical signal by the piezoelectric effect of the piezoelectric element. The output signal of the bodily action detecting means 1, after being inputted to a signal processing means 2 consisting of an amplifier means 2-a, a filter 2-b and a smoothing means 2-c and processed appropriately, is sent to the time measuring means 3. The output by fixed time of the signal processing means 2 is stored in a storage part 3-a, and a time when the output is within a prescribed range out of the stored output of the signal processing means 2 is measured, and the presence/absence of the person can be judged from a measured result by a judging means 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detecting apparatus for detecting the presence / absence of a person on a device supporting a person such as a seat or a bed.

[0002]

2. Description of the Related Art Conventionally, an in-vehicle seat detecting device of this type has a structure as shown in FIG. That is, 1 is a body motion detecting means, 2 is a signal processing means, 4 is a judging means,
The signal processing means 2 includes an amplifying means 2-a for amplifying the output signal of the body movement detecting means 1, a filter 2-b for filtering a specific frequency component of the output signal of the amplifying means 2-a, and a filter 2-b. It comprises smoothing means 2-c for smoothing the output signal. Here, the body movement detecting means 1 is a film-shaped piezoelectric element.

When a human body sits on the seat 5, the seat 5
The body movement detecting means 1 composed of the piezoelectric element disposed in the is deformed, and a voltage is generated by the piezoelectric effect. In this generated signal, a large signal temporarily appears due to the impact of sitting when seated, but when the human body is at rest, small body movement signals due to the heartbeat and breathing of the human body appear. If there is no human body, the output signal will be zero. When an object is placed on the seat, a large signal appears momentarily at the moment the object is placed, but the output signal becomes zero because the object does not have minute movements due to the heartbeat and breathing like the human body. The output signal from the body motion detecting means 1 is amplified by the amplifying means 2-a, filtered by the filter 2-b to a required frequency component, and further smoothed by the smoothing means 2-c. The determination means 4 determines the presence / absence of a person.

[0004]

However, in the human body detecting device of the above-mentioned conventional technique, when all persons including men and women of all ages, healthy persons, injured persons, etc. are targeted, the signal appearing from the human body is small due to the activity state of the human body. In some cases, when the signal is small, it is difficult to distinguish it from environmental vibrations due to people walking near the equipment or passing by cars on nearby roads. There was a problem that it was not possible to judge clearly. It is a first object of the present invention to provide a human body detection device that can reliably determine the presence of any person.

A second object of the present invention is to provide a human body detection device which can reliably determine the presence of a human body with a simple structure.

A third object of the present invention is to provide a human body detecting apparatus capable of immediately determining the presence of a human body when a human body signal is applied.

[0007]

In order to achieve the above first object, a human body detecting apparatus of the present invention is a body movement detecting device provided on a human body supporting portion of a device for supporting a human body such as a seat or a bed. Means, signal processing means for processing the output of the body movement detecting means, time measuring means that operates according to the output of the signal processing means, and presence of a human body on the device by the output of the time measuring means. It comprises a judging means for judging.

In order to achieve the above first object, in the human body detecting apparatus of the present invention, the time measuring means has a storage means and stores the output of the signal processing means from the present time to a certain time before.

Further, in order to achieve the first object, the human body detecting apparatus of the present invention has a plurality of time measuring means, each of which outputs the signal processing means during the time from the present time to a certain time before each time. The measuring means measures and outputs the time when it is within each predetermined range.

In order to achieve the first object, the human body detecting apparatus of the present invention has a plurality of time measuring means, at least one of which outputs the signal processing means during a time different from other time measuring means. Is measured and output to the time measuring means when it is within a predetermined range.

In order to achieve the above second object, the human body detecting apparatus of the present invention comprises a body movement detecting means arranged in a human body supporting portion of a device for supporting a human body such as a seat or a bed, and A signal processing means for processing the output of the body movement detecting means, a constant converting means for dividing the output of the signal processing means into a plurality of stages and outputting a constant corresponding to each stage, and a range having an upper limit value and a lower limit value. The counter comprises a counter for adding the numerical values output from the constant converting means, and a determining means for determining the presence of a human body on the device based on the output of the counter.

Further, in order to achieve the third object, the human body detecting apparatus of the present invention comprises a body movement detecting means arranged in a human body supporting portion of a device for supporting a human body such as a seat or a bed, and Signal processing means for processing the output of the body movement detecting means, and time measuring means that operates according to the output of the signal processing means,
The signal processing means and the time measuring means are composed of a judging means for judging the presence of a human body on the device.

Further, in order to achieve the third object, the human body detecting apparatus of the present invention outputs the output of the time measuring means when the judging means outputs the signal processing means at the present time within a predetermined range. Regardless of the presence of the human body.

In order to achieve the third object, the human body detecting apparatus of the present invention has a plurality of time measuring means, one of which is a range in which the output of the signal processing means at the present time is predetermined. When the output of the time measuring means is a certain value or more, the presence of the human body is determined regardless of the output of other time measuring means.

In order to achieve the above first object, the human body detecting apparatus of the present invention comprises a body movement detecting means arranged in a human body supporting portion of a device for supporting a human body such as a seat or a bed, and The signal processing means for processing the output of the body movement detecting means, the first judging means for judging and outputting the possibility of the presence of a human body on the equipment by the output of the signal processing means, and the first judging means. It comprises a time measuring means which operates according to the output, and a second judging means for judging the presence of a human body on the device based on the outputs of the first judging means and the time measuring means.

[0016]

The present invention operates as follows with the above construction. When a human body rides on a device such as a seat or bed and the weight of the human body is added to the device, the human body motion is added to the body motion detecting means provided in the device, and the body motion detecting means responds to the generated body motion. Output signal. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the time measuring means. The time measuring means measures and outputs the time when the output of the signal processing means is within a predetermined range, and the judging means judges the presence or absence of a human body on the equipment by the output of the time measuring means.

Further, when a human body rides on a device such as a seat or bed and the weight of the human body is applied to the device, the body motion detecting means provided in the device is added with the body motion of the human body, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the time measuring means. In the time measuring means, first, the output of the signal processing means for a certain time is stored in the storage means, and then the stored output of the signal processing means is within the predetermined range. And output to the judgment means,
The determination means determines the presence or absence of a human body on the device based on the output of the time measurement means.

When a human body rides on a device such as a seat or bed and the weight of the human body is applied to the device, the body motion detecting means provided in the device is added with the body motion of the human body, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the plurality of time measuring means. Each time measuring means measures the time when the output of the signal processing means is within a predetermined range for each time measuring means during the time from the present time to a certain time before, and outputs each to the judging means. The determining means determines the presence or absence of a human body on the device based on the output of the time measuring means.

Further, when a human body rides on a device such as a seat or bed and the weight of the human body is applied to the device, the body motion of the human body is added to the body motion detecting means arranged in the device, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the plurality of time measuring means. At least one of the time measuring means measures the time when the output of the signal processing means is within a predetermined range for each time measuring means during the time from the present time to a certain time ago, and each of them serves as the judging means. Further, at least one of the time measuring means other than the above measures the time when the output of the signal processing means is within a predetermined range for each time measuring means during a time different from the other time measuring means. Then, each is output to the determination means, and the determination means determines the presence or absence of a human body on the device based on the outputs of the plurality of time measuring means.

When a human body rides on a device such as a seat or a bed and the weight of the human body is applied to the device, the body motion detecting means provided in the device is added with the body motion of the human body, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the time measuring means. In the time measuring means, first, the constant converting means divides the output of the signal processing means into a plurality of stages and outputs a constant corresponding to each stage, and then a counter adds the constants outputted by the constant converting means. Output to the determination means. The determination means determines the presence or absence of a human body on the device based on the output of the counter of the time measurement means.

Further, when a human body rides on a device such as a seat or bed and the weight of the human body is applied to the device, the body motion detecting means provided in the device is added with the body motion of the human body, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the time measuring means. The time measuring means measures and outputs the time when the output of the signal processing means is within a predetermined range, and the judging means judges the presence or absence of a human body on the equipment by the outputs of the signal processing means and the time measuring means. To do.

When a human body rides on a device such as a seat or a bed and the weight of the human body is applied to the device, the human body motion is added to the body motion detecting means arranged in the device, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the time measuring means. The time measuring means measures and outputs the time when the output of the signal processing means is within a predetermined range, and the determining means measures the time when the output of the signal processing means is within the predetermined range. The presence or absence of a human body on the device is determined only by the output of the signal processing means regardless of the output of the means.

When a human body rides on a device such as a seat or a bed and the weight of the human body is applied to the device, the body motion detecting means provided in the device is added with the body motion of the human body, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the plurality of time measuring means. One of the plurality of time measuring means measures and outputs the time when the output of the signal processing means is within a predetermined range, and the determining means determines the output of the time measuring means in advance. If it is within the range, the presence or absence of the human body on the device is determined only by the output of the signal processing means regardless of the output of the other time measuring means.

When a human body rides on a device such as a seat or a bed and the weight of the human body is applied to the device, the body motion detecting means provided in the device is added with the body motion of the human body, and the body motion detecting means is generated. It outputs a signal according to the body movement. This output signal fluctuates due to minute body movements of the human body, and this fluctuation component is processed by the signal processing means and output to the first judging means. In the first determining means, the possibility of the presence or absence of a human body on the device at the present time is determined by the output of the signal processing means, and is output to the time measuring means as the magnitude of the possibility of being present or absent. Then, the time when the output of the first determination means is within a predetermined range is measured and output,
The second determination means determines the presence or absence of a human body on the device based on the outputs of the first determination means and the time measurement means.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the present embodiment. Here, the case where it is installed in a seat as a device for supporting a human body is shown. In FIG. 1, 1 is a body movement detecting means, 2 is a signal processing means, 3 is a time measuring means, and 4 is a judging means. The signal processing means 2 is composed of an amplifying means 2-a, a filter 2-b, and a smoothing means 2-c, and the time measuring means 3 is composed of a storage section 3-a and a time measuring section. .
The body movement detecting means 1 uses a piezoelectric element in this embodiment, and converts the vibration due to the body movement of the human body into an electric signal by the piezoelectric effect of the piezoelectric element. Incidentally, the human body detection device of the present invention is not limited to a piezoelectric element in the system of the body movement detecting means, but a pressure sensor, a resistance type displacement sensor, an infrared ray as long as the body movement can be converted into an electric signal. Any element such as a sensor may be used.

When a human body sits on the seat 5, the seat 5
The body movement detecting means 1 disposed in the body is deformed, and a voltage is generated by the piezoelectric effect. In this generated signal, a large signal temporarily appears due to the impact of sitting when seated, but when the human body is at rest, small body movement signals due to the heartbeat and breathing of the human body appear. If there is no human body, the output signal will be zero. When an object is placed on the seat 6, a large signal appears momentarily at the moment it is placed, but the output signal becomes zero because the object does not have minute movements due to heartbeat or breathing like the human body. . In the signal processing means 2, the output signal from the body movement detecting means 1 is amplified by the amplifying means 2-a, filtered by the filter 2-b to a required frequency component, and smoothed by the smoothing means 2-c. Is smoothed by and output to the time measuring means 3. The time measuring unit 3 stores the output of the signal processing unit 2 for a certain period of time in the storage unit 3-a, and the time measuring unit 3-c is within a predetermined range from the stored outputs of the signal processing unit 2. In the case of, the time is measured and output to the determination means 4, and the determination means 4 determines the presence / absence of a person.

The operation of the structure of the first embodiment will be described below. FIG. 2 shows an example of the output of the signal processing means when a person is sitting still on the seat 5. Here, FIG.
(A) is a normal person, (b) is a victim, (c)
Indicates the case where there is no human body, Tm in the figure is the time for which the signal processing means is stored in the storage section of the output time measuring means, Vj is the judgment value for the output of the signal processing means for determining whether or not to measure the time, Further, ΔTj is a time interval for determining the presence of a human body. As shown in (a), in the case of a healthy person,
A sufficiently large output can be obtained for Vj even at rest,
As shown in (b), in the case of an injured person, the blood pressure is lowered due to a decrease in the discharge pressure of the heart, so that the body movement is small and the output of the body movement detecting means is also small. Output is smaller. Therefore, an output that is Vj or less may appear, although it is temporary. When the signal becomes small as described above, the presence of the human body can be reliably determined by further reducing the value of Vj. However, if Vj is too small, a person may walk near the seat even when there is no human body. However, there is a possibility that a human body may be erroneously determined to be present due to a weak environmental vibration due to the traffic of a nearby vehicle, and there is a limit to the determination based on only the output of the signal processing means 2. However, in the present embodiment, at the time of determining the presence / absence of a human body, the presence of a person is used by using the time td when the value becomes equal to or less than the determination value Vj during a time Tm from a certain time before that time to the time Is being determined. In (b),
The time during which the output of the signal processing means falls below Vj during Tm is Tm-t1 because the time above Vj is t1. On the other hand, in (c), as shown in the figure, a signal that exceeds Vj appears temporarily due to the vibration of the traffic of the automobile, and the time is t2 during the time Tm here. However, in the case where there is no human body, the level is generally low, so the time for exceeding Vj is short, and in many cases t1 >> t2. Therefore, by setting an appropriate tj such that t1>tj> t2, the presence of the human body can be reliably determined even when the determination is delicate.

Further, in this embodiment, the time measuring means 3 is provided with a storage section 3-a. If the determination interval Tj is made longer than the required Tm, the time can be measured during that time, so a storage unit is not always necessary. However, if environmental vibration is large, Tm may need to be long. In some cases, it is effective to provide a storage unit to prevent Tj from becoming long. In this embodiment, Tj is 1 / Tm.
2

As described above, in the human body detecting apparatus according to the present embodiment, the output of the body movement detecting means is processed by the signal processing means, and the output of the time measuring means which operates according to the output of the signal processing means is used for the equipment. Since the existence of the person above is determined,
Even if the signal of the person is small, the presence or absence of the person can be reliably determined.

Further, since the storage unit is provided in the time measuring means, the determination interval can be shortened regardless of the measuring time of the time measuring means.

Next, a second embodiment of the present invention will be described.
FIG. 3 shows a block diagram of the human body detecting apparatus according to the present embodiment. This embodiment is different from the first embodiment of the present invention in that there are a plurality of time measuring means, each of which operates independently according to the output of the signal processing means, and that the device for detecting a human body is not a seat. The point is that it is a bed.

In the human body detecting means of the first embodiment, since there is only one time measuring means, it is judged whether the output of the signal processing means is present or absent, and then a finer judgment is made according to the length of each time. Can be said to have been doing. However, if an erroneous determination is made in the determination stage before the time measurement, the erroneous determination will increase even if the time measurement is performed. Therefore, the human body detecting means of the present embodiment has a plurality of time measuring means, and each of them operates independently according to the output of the signal processing means.

In the present embodiment, there are five time measuring means, four of which have different output conditions of the signal processing means for measuring time, but the same constant time before the determination time. From the time to the determination time, the remaining one measures the time in the case where the output range of the predetermined signal processing means is different from the other four.

The operation of the second embodiment will be described. First, FIG. 4 shows an example of the output of the signal processing means. In the figure, (a) shows a case of a healthy person, and (b) shows a case of an unhealthy person. As shown in the figure, even in the case of an unhealthy person, not only a small signal but also a somewhat large signal is regularly generated. This is because the vibration when pumping blood in the left and right atrium of the heart to the blood vessels appears larger than other conditions, and the thing due to the vibration of the diaphragm during breathing, but in any case,
It is a substance that appears regularly due to the reaction of the living body. Therefore,
More accurate human body detection by dividing the output of the signal processing means into a plurality of criteria using a plurality of criteria, and determining the presence or absence of a human body by the size of the appearance time of each output. Can be done. In FIG. 4, the output of the signal processing means is divided into four, and the time measuring means corresponding to each range is operated. That is, when V <V _j1, the time measuring means 1 operates. When V _j1 <V <V _j2 , the time measuring means 2 operates. When V _j2 <V <V _j3 , the time measuring means 3 operates. V _j3 <V The time measuring means 4 operates. The outputs of the respective time measuring means are t1, t2, t3 and t4.
And these are output to the determination means. The determination means determines the presence or absence of a human body by performing the following calculation using these four outputs. That is, TVc> TV
When j, there is a human body.

However, TVc = a × t1 + b × t2 + c ×
t3 + d × t4 Here, a, b, c, and d are constants, and in the present embodiment, a = −3 b = −1 c = 1 d = 3. Further, TVj is set as TVj = 0.

In FIG. 4, (a) shows a state in which a healthy person is sitting on the seat, (b) shows a case of a sick person, and (c) shows a case where no person is sitting. From the figure, the value of TVc is (a) TVc (a) = 3 × t4 + t3 (b) TVc (b) = 3 × t4 + t3-t2 (c) TVc (c) = t3-t2-3 × t1 In the above equation, t1, t2, t3, and t4 all take positive values, so when there is a person, in TVc (a), especially t4.
Due to the effect of the multiplication constant d = 3, TVc (a) >> 0, and TVc (b) also has an output exceeding Vj3, and from t3> t2, TVc (b) >> 0. On the other hand, in the case of no person (c), a large signal is continuously generated for a certain period of time due to environmental vibration as shown in the figure, and t3> t
Even if it becomes 2, the level of environmental vibration is much smaller than the signal when a person is seated, so it does not exceed Vj3, and almost no Vj1 when there is no normal vibration.
Because of the following small levels, t1> 0,

[0037]

[Equation 1]

Up to the condition (1), there is no erroneous determination that there is a human body, and therefore, if the constant is appropriate, it is possible to detect the human body more reliably without being affected by environmental vibration.

Further, the human body detecting apparatus of the present embodiment further comprises another time measuring means, and the output of the signal processing means is within a predetermined range during a time different from the other time measuring means. If you are measuring the time. This is because when other time measuring means is used to determine the presence of the human body from the short-term signal trends, the presence of the human body is delicate by observing the relatively long-term signal trends. It is used to make a reliable judgment.

FIG. 5 shows the output of the signal processing means determined by using this time measuring means. (A) shows the case where a human body exists, (b) shows the case where a human body does not exist. here,
It measures and outputs the time when the output Vo of the signal processing means becomes Vj4 or more during the time from the current time to Tm2 before to the Tm1 time. Where V
j4 is set to a value slightly smaller than Vj2 but larger than Vj1. In the case of (a), there is fluctuation in the minute movement due to the respiration of the human body or the beating of the heart, and in the case of a person with weak activity in the body such as a victim, it may be obtained from the signal processing means in the short term. The output power can be quite low. In that case, in the short-term determination, it is erroneously determined that no person exists when the short-term output decreases due to fluctuation.
However, such malfunction can be prevented by observing the signal trend for a relatively long time. In (a), T
The output of the signal processing means becomes Vj2 or less during the time of m1, and it is erroneously determined that there is no person only by the short-term determination. However, when it is seen during the time of Tm2, the output is almost Vj4 or more, and Vj4 or more. Is the judgment value Tj
By comparing with 5, it can be determined that there is a human body.

It should be noted that these constants and threshold values are not limited to the above values, and the optimum values change depending on the environment in which the seat is placed. Becomes

As described above, the human body detecting apparatus of the present invention has a plurality of time measuring means, and each of them operates independently according to the output of the signal processing means, so that the human body can be detected more reliably without being affected by environmental vibration. Will be possible.

Further, according to the present invention, when one time measuring means of the plurality of time measuring means has an output of the signal processing means within a predetermined range during a time different from the other time measuring means. Since the time is measured, it is possible to more reliably make a determination when the presence of the human body is delicate.

Next, a third embodiment of the present invention will be described.
FIG. 6 shows the human body detection apparatus of this embodiment. This embodiment is different from the second embodiment of the present invention in that instead of a plurality of time measuring means, there is a constant converting means 3-a and a counter 3-b, and the constant converting means 3-a is a signal processing means. 2 output is divided into multiple stages and the constant corresponding to each stage is counter 3-
The counter 3-b has an upper limit value and a lower limit value, and adds the numerical values output from the constant converting means 3-a within that range, and outputs the result to the determining means 4.

In the human body detecting means of the second embodiment of the present invention, highly accurate judgment can be realized by providing a plurality of time measuring means, but the system is complicated because a plurality of time measuring means are required. Therefore, there is a drawback that storage means and calculation speed are required. Therefore, in the human body detection apparatus according to the present embodiment, the constant converting means 3-a and the counter 3-b are provided instead of the plurality of time measuring means.
-A indicates that the output of the signal processing means 2 is divided into a plurality of stages and outputs a constant corresponding to each stage to the counter 3-b. The counter 3-b has an upper limit value and a lower limit value, and within the range, the constant converting means. The numerical values output from 3-a are added and output to the determination means 4.

The operation of the third embodiment will be described. In the constant converting means 3-a, the output of the signal processing means 2 is sampled at a constant time interval Δt, and this is divided into four according to the value, as in the second embodiment, and four constants are provided for each. Is output to the counter 3-b. That is, when V <V _j1 , e = −3 when V _j1 <V <V _j2 , e = −1 when V _j2 <V <V _j3 , and when e = 1 V _j3 <V, e = 3.

On the other hand, the counter 3-b receives this constant value every .DELTA.t and successively adds it. 7 to 10 show the value of the counter 3-b in each state. When the human body exists as shown in FIG. 7, the counter value C is e> 0, and therefore a positive value is added to increase the counter value. On the contrary, when the human body does not exist as shown in FIG. 8, e <0 and C is a negative value. Is added and becomes smaller. Here, since the counter has an upper limit value and a lower limit value, in many cases, it is constant at the upper limit value when a human body exists and at the lower limit value when a human body does not exist. However, as shown in FIG. 9, in the case of a human body such as an unhealthy person with small body movements, the upper limit value may not be constant even if a human body exists, and as shown in FIG. In some cases, the lower limit value may not be constant even if no human body is present. In this case, the presence / absence of a human body is determined using C as thresholds Cte and Ctn. That is, the human body exists when C> Cte, and the human body does not exist when C ≦ Ctn. Further, FIG. 7 also shows a case where the human body is not present while sitting on the chair. In such a case, The value of the counter 3-b gradually increases from the lower limit value and increases,
When C> Cte, the determination changes from absent to presence. Therefore, even if the output of the signal processing unit temporarily increases due to noise or environmental vibration, the determination is made unless the state continues for a while. Since it does not change, it is possible to make a highly reliable determination. This is the same when the presence shown in FIG. 8 changes to the absence.

Therefore, it can be said that the human body detecting means of the present embodiment can realize the highly accurate determination as described in the second embodiment of the present invention.

In this embodiment, Cte and Ctn are
Cte> Ctn is set in order to reliably grasp the change in state and make the determination.

Further, these constants and threshold values are not limited to the above values, and the optimum values change depending on the environment in which the seat is placed. Therefore, it is necessary to carry out an operation to make optimum settings according to the usage situation. Becomes

As described above, since the human body detecting apparatus of this embodiment uses the constant converting means and one counter instead of using a plurality of time measuring means, it is possible to detect a human body with high accuracy with a simple structure. it can.

Next, a fourth embodiment of the present invention will be described.
FIG. 11 shows a block diagram of the human body detecting apparatus of this embodiment.
The present embodiment is different from the first embodiment of the present invention in that the judging means 4 detects the human body by using not only the output of the time measuring means 3 but also the output of the signal processing means 2.

In the human body detecting means of the first embodiment of the present invention, the human body is detected by using the output of the time measuring means 3. Therefore, when the judgment is changed, it changes after a lapse of a fixed time. This time depends on a constant for making a judgment, and when a subtle judgment needs to be made, the output of the signal processing means 2 for a longer time is examined to make the judgment, and therefore there is a drawback that the change in the judgment becomes slow. It was Therefore, the determination unit 4 of the human body detection apparatus according to the present embodiment is the time measurement unit 3
In addition to the output of, the output of the signal processing means 2 is also used to detect the human body.

The operation of the fourth embodiment will be described. FIG. 12 shows the output of the time measuring means 3 and the output of the signal processing means 2 when the human body is seated on the seat 5. In the figure, the human body is seated on the seat 5 at the time point A. (B) shows the output of the time measuring means 3. When this is seen, the output after the person sits down gradually increases with the passage of time since the output shows the time elapsed from the time of sitting down, and after the sitting Tj At the time point B after passing, the output exceeds the threshold value Tj and it is judged that the person is present for the first time. The human body detection threshold value Tj is set to a time of several seconds in order to detect an unhealthy person with a small body movement, but it is necessary to further lengthen this to increase the certainty, and only the time measuring means 3 is used. In the case of the existing determination, as the certainty of the determination increases, the time from the absence of the human body after sitting to the determination of changing to the presence becomes longer. On the other hand, looking at the output of the signal processing means 2 in (a), when a person sits down, a large body movement is applied to the body movement detecting means 1 arranged in the seat 5, so that the output of the signal processing means 2 is also increased. Since it increases rapidly, it is possible to shorten the time until the determination that the human body is seated after being seated by directly using the output of the signal processing means 2. In the human body detection apparatus of this embodiment, the seating determination threshold value Vs is used, and at the time C when the output of the signal processing unit 2 exceeds Vs, it is determined that the user is present regardless of the output of the time measuring unit 3.

Assuming that an output that exceeds Vs for a very short time is output due to the influence of noise or the like, it operates only when the output of the signal processing means 2 exceeds a certain value. It is also possible to provide the time measuring means and to use this output to judge the seating. That is, if the output of the signal processing means 2 exceeds Vs and the output of the second time measuring means exceeds a constant value Td 'which is sufficiently smaller than Tj, it is judged that the person is present at least Td'. The state is a condition for the human body determination, and it is necessary to continuously output a high value for a certain period of time, so that the influence of noise can be reduced. A block diagram in this case is shown in FIG. The method using the second time measuring means is different from the plurality of time measuring means described in the second embodiment of the present invention in that when the output of the time measuring means exceeds a certain value, another time measuring means is used. Regardless of whether they are present or not, they may exist independently of each other.

As described above, in the human body detecting apparatus of the present embodiment, the presence or absence of the human body on the equipment is determined by using the output of the signal processing means in addition to the output of the time measuring means, so that immediately when the human body is seated. You can change the decision from absent to seated.

Further, a second time measuring means is provided which operates only when the signal processing means exceeds a certain value, and the presence of a person is determined by the output of this time measuring means regardless of the outputs of other time measuring means. Therefore, the influence of noise can be reduced.

Next, a fifth embodiment of the present invention will be described.
FIG. 14 shows a block diagram of the human body detection apparatus of this embodiment.
The present embodiment is different from the fourth embodiment of the present invention in that the signal processing means has two filters, a first filter and a second filter, each of which outputs independently and is based on the outputs of the two filters. Has a first judging means for judging the possibility of the presence of a human body on the seat, and the time measuring means operates based on the output of the first judging means, and outputs the first judging means and the time measuring means. It is the point that it comprises a second judging means for judging the presence or absence of a human body on the seat based on the output.

In the human body detecting apparatus according to the above-described embodiment of the present invention, the time measuring means 3 is operated based on the output of the signal processing means 2. However, when the use environment of the seat 5 is special and the human body exists. When the magnitude of the output of the signal processing means 2 and the magnitude of the output of the signal processing means 2 when there is no human body are close to each other, it is difficult to determine the presence or absence of the human body. Therefore, in the human body detection apparatus according to the present embodiment, the first determination means 7
The possibility of the presence of a human body on the seat 5 is determined based on the output of the signal processing means 2, and the time measuring means 3 is operated by this determination.

The operation of the fifth embodiment will be described. Here, as a particularly vibrating environment, a case where the seat 5 is placed in a living room under the elevated railway is shown. Under the elevated railway, a large vibration is generated when the train passes over the elevated, and this vibration is transmitted to the seat 5 through the structure of the living room, and the body movement detecting means 1
Signal is generated from. When the train formation is long, vibration is applied for a correspondingly long time, so that the output of the body movement detecting means 1 also becomes long and an erroneous determination often occurs. In this embodiment, in order to eliminate such a malfunction, the vibration due to the passage of the train and the vibration due to the presence of the human body are separated by the frequency of the vibration, so that the presence or absence of the human body can be determined even if the same magnitude signal is generated. . FIG. 15 shows a frequency analysis result of vibration caused by body movement of a human body and a frequency analysis result of vibration caused by passage of a train. The vibration frequency of the human body is 0.1 as shown in (a).
Respiratory signals from Hz to 1 Hz and heartbeat vibrations from 0.5 Hz to 5 Hz appear regularly. Further, the human body is soft due to a large amount of water, and vibrations with a high frequency are blocked and thus are not transmitted so much. Therefore, the vibrations transmitted from the human body to the body movement detecting means 1 have a large component of 10 Hz or less. Coarse body movements also appear in addition to this, although irregular and relatively high frequency components also appear, but the output obtained is considerably larger than the output due to respiration and heartbeat, so if there is coarse body movement, environmental vibration Since it is almost impossible to make an erroneous judgment sufficiently larger than the signal by, it is not described here. On the other hand, when the train is passing, the vibration of the train is transmitted to the track, and the vibration is transmitted to the floor of the living room through the elevated structure and is transmitted to the seat 5. In this case, the vibration changes to the structure of the elevated structure or the structure of the floor surface, but since the hardness of the structure is generally high, the vibration of several tens Hz is also stably transmitted as shown in (b). Therefore, the vibration of the human body and the vibration due to the passage of the train have different frequency components, and the body movement detecting means 1
Since the frequency component of the output of is also changed, it is possible to distinguish the vibrations of the two to some extent by analyzing the frequency, and it is possible to judge the possibility of the presence of a person on the seat 5.

In the human body detecting apparatus of this embodiment, the body movement detecting means 1 is constructed by using the first filter 2-d for detecting the human body vibration and the second filter 2-e for detecting the vibration due to the passage of the train. The output is processed, the first determination means 7 determines the possibility of the presence of a human body on the seat 5 from these two outputs, and the time measuring means 3 is determined by the possibility of the presence of this human body. The presence of the human body on the seat 5 is determined by the output of the time measuring means 3 and the output of the first determining means 7. FIG. 16 shows the result of separating the vibration of the human body and the vibration of the train by the outputs of the two filters. In the figure, the horizontal axis represents the output of the second filter 2-e that detects the vibration due to the passage of the train, and the vertical axis represents the output of the first filter 2-d that detects the vibration of the human body, the output of the two filters. The current state is shown on the figure according to the size of. First, in the case where a human body exists and the train does not pass, there is vibration of the human body but no vibration due to the passage of the train, so that it is plotted in the A section on the left side of the figure. When there is no human body and there is no train vibration, there is no signal in both outputs, so the focus is on the vicinity B at the origin. Human body does not exist,
In addition, when there is vibration of the train, only the vibration due to the passage of the train is large, and therefore it is dispersed on the lower right side C in the figure. Finally,
When a human body is present and a train is passing, both outputs have large signals, and therefore the signals are dispersed to the upper right side D. Since the above four areas overlap each other, the presence of a person cannot be simply determined from the two outputs, but the possibility of a person being present with respect to the outputs of the two filters can be determined. In the present embodiment, the first judging means 7 divides the judgment possibility into four stages as shown in FIG. 16 (b), from 1 to 1 showing the stages of these possibilities according to the outputs of the two filters. Numerical values up to 4 are output. Here, it is indicated that the smaller the number, the lower the possibility that a person exists. Time measuring means 3
Then, receiving the output of the first judging means 7, the constant converting means 3-a allocates the constants to each. That is, when the possibility of existence is 1, e = −3, when the possibility of existence is 2, e = −1, when the possibility of existence is 3, e = 1, and when the possibility of existence is 4, e = 3. These constants are added by the counter 3-b and output to the second judging means 8, and the second judging means 8 outputs the human body based on the output of the counter 3-b in the same manner as the third embodiment. The possibility of existence is determined.

The constants and thresholds described above are not limited to the above values, and the optimum values change depending on the seated environment. Is required.

As described above, the human body detecting apparatus of this embodiment is
It has first judging means for judging the possibility of the presence of a human body on the seat based on the output of the signal processing means, and judges the presence or absence of the human body on the seat by this output and the output of the time measuring means operated by this output. Therefore, the environmental vibration is particularly large, and it is difficult to determine the presence of the human body on the device only by the output of the signal processing means. Even when complicated processing is required, the presence of the human body on the device can be reliably determined. .

Although the human body detecting apparatus of this embodiment uses two filters for discriminating between environmental vibration and human body vibration as the judging method of the first judging means, it does not prescribe the judging method. Therefore, any method may be used as long as it is not determined only by the magnitude of the output of the signal processing means. For example, more filters may be used to cope with a more complicated environment, or the output of the signal processing means may be converted from the time axis to the frequency axis by FFT or the like without using the filters, and the first determination means may be used. The possibility of the presence of a human body on the device may be determined.

According to the human body detecting apparatus of the present invention as described above, the presence / absence of the human body on the device supporting the human body can be accurately determined. Further, it is possible to provide a human body detection device that does not malfunction even if the device is placed under various vibration environments, due to the influence of vibration. As a result, vacant seats in a theater or an automobile can be accurately grasped, and can be used for air conditioning and sound field control.

[0066]

As described above, according to the human body detecting apparatus of the present invention, the following effects can be obtained.

(1) The output of the body motion detecting means is processed by the signal processing means, and the output of the time measuring means having a storage section which operates according to the output of the signal processing means is used to detect the presence of a person on the equipment. Since the presence / absence is determined, the presence of a person can be reliably detected in a short determination time regardless of the measurement time of the time measuring means even when the signal of the person is small.

(2) Since there are a plurality of time measuring means, and each of them operates independently according to the output of the signal processing means, it is possible to detect the human body more reliably without being affected by environmental vibration.

(3) One of the plurality of time measuring means measures the time when the output of the signal processing means is within a predetermined range during a time different from the other time measuring means. Therefore, it is possible to more reliably make a determination when the presence of the human body is delicate.

(4) Instead of using a plurality of time measuring means, a constant converting section and one counter are used.
Highly accurate human body detection is possible with a simple configuration.

(5) Since the presence / absence of a human body on the equipment is determined by using the output of the signal processing means in addition to the output of the time measuring means, it is possible to immediately change the determination from absence to presence when the human body is seated. it can.

(6) The output of the time measuring means which operates when the output of the signal processing means reaches a predetermined value is used, and when the output of this time measuring means exceeds a certain value, the other time measuring means Since it is determined that there is a human body on the device regardless of the output, when the human body is seated, the determination can be immediately changed from absent to seated and the influence of noise can be reduced.

(7) A first judging means for judging the possibility of the presence of a human body on the seat based on the output of the signal processing means is provided, and on the seat by this output and the output of the time measuring means operated by this output. Since the presence or absence of the human body is determined, the environmental vibration is particularly large, and it is difficult to determine the presence of the human body on the device only by the output of the signal processing means, and even when complicated processing is required, the human body on the device is detected. Existence can be reliably determined.

[Brief description of drawings]

FIG. 1 is a block diagram of a human body detection device according to a first embodiment of the present invention.

FIG. 2 (a) is an output diagram of the signal processing means of the same apparatus in the case of a healthy person. (B) is an output diagram of the signal processing means of the same apparatus in the case of a non-healthy person. (C) is a person of the signal processing means of the same apparatus. Output diagram without

FIG. 3 is a block diagram of a human body detection device according to a second embodiment of the present invention.

FIG. 4 (a) is an output diagram of the signal processing means of the same apparatus in the case of a healthy person. (B) is an output diagram of the signal processing means of the same apparatus in the case of an unhealthy person. (C) is a person of the signal processing means of the same apparatus. Output diagram without

FIG. 5 is an output diagram of the signal processing means of the device in the case of an unhealthy person.

FIG. 6 is a block diagram of a human body detection device according to a third embodiment of the present invention.

FIG. 7 (a) is an output diagram of a signal processing unit when a healthy person of the device is sitting (b) is an output diagram of a counter when a healthy person of the device is sitting (c) a healthy person of the device is sitting Output diagram of the judgment means

FIG. 8A is an output diagram of a signal processing unit when a healthy person of the device stands up. FIG. 8B is an output diagram of a counter when a healthy person of the device stands up. Output diagram of the judgment means when a healthy person stands up

FIG. 9 (a) is an output diagram of the signal processing means of the same device when an unhealthy person is sitting (b) is an output diagram of a counter when the unhealthy person of the device is sitting (c) Output diagram of the judgment means when an unhealthy person is sitting

FIG. 10 (a) is an output diagram of the signal processing means of the same apparatus when there is no human body, (b) is an output diagram of a counter of the same apparatus when there is no human body, and (c) shows a determination means of the same device when there is no human body. Output diagram

FIG. 11 is a block diagram of a human body detection device according to a fourth embodiment of the present invention.

FIG. 12 (a) Output diagram of signal processing means when the human body of the same device is sitting (b) Output diagram of time measuring means when the human body of the same device is sitting (c) Human body of the same device is sitting In the case of using only the time measuring means, an output diagram of the determining means (d) An output diagram of the determining means in the case of using the signal processing means when the human body of the device is sitting

FIG. 13 is a block diagram of a human body detection device when the second time measuring means of the same device is provided.

FIG. 14 is a block diagram of a human body detection device according to a fifth embodiment of the present invention.

FIG. 15 (a) is a frequency analysis diagram of the output of the body movement detecting means in the presence of a human body of the same apparatus; and (b) shows the output of the body movement detecting means of the same apparatus in the absence of a human body when a train passes by. Frequency analysis chart

FIG. 16 (a) is a distribution chart of the output of the signal processing means of the apparatus, and (b) is a decision output table diagram of the first decision means of the apparatus.

FIG. 17 is a block diagram of a human body detection device in a conventional example.

[Explanation of symbols]

 1 body motion detecting means 2 signal processing means 2-a amplifying means 2-b filter 2-c smoothing means 2-d first filter 2-e second filter 2-f first smoothing means 2- g Second smoothing means 3 Time measuring means 3-a Storage section 3-b Time measuring section 3-c Constant generating means 3-d Counter 4 Judging means 5 Seats 6 Beds 7 Second time measuring means 8 First Judgment means 9 Second judgment means

Claims (9)

[Claims] 1. A body movement detecting means disposed on a supporting portion of a device for supporting a human body such as a seat or a bed, a signal processing means for processing an output of the body movement detecting means, and an output of the signal processing means. A human body detection device comprising: a time measuring unit that operates in accordance with the above; and a determining unit that determines the presence of a human body on the device based on the output of the time measuring unit. 2. The human body detecting apparatus according to claim 1, wherein the time measuring means has a storage means and stores the output of the signal processing means from a certain time before the present time to the present time. 3. A plurality of time measuring means, each of which is provided when the output of the signal processing means during the time from a certain time before the present time to the present time is within each predetermined range for each time measuring means. The human body detection device according to claim 1, which measures and outputs time. 4. A time when a plurality of time measuring means are provided, at least one of which is different from the other time measuring means when the output of the signal processing means is within a predetermined range of the time measuring means. The human body detection device according to claim 1, which measures and outputs 5. A body movement detecting means disposed in a human body supporting portion of a device for supporting a human body such as a seat or a bed, a signal processing means for processing an output of the body movement detecting means, and the signal processing means. A constant conversion means for dividing the output of the step into a plurality of steps and outputting a constant corresponding to each step, a counter having an upper limit value and a lower limit value for adding the numerical values output from the constant conversion means within the range, and A human body detection device comprising a determination means for determining the presence of a human body on the device based on the output of a counter. 6. A body movement detecting means arranged in a supporting portion of a device for supporting a human body such as a seat or a bed, a signal processing means for processing an output of the body movement detecting means, and an output of the signal processing means. A human body detecting device comprising: a time measuring unit that operates in accordance with the above; and a determining unit that determines the presence of a human body on the device by the output of the signal processing unit and the time measuring unit. 7. The human body detecting apparatus according to claim 6, wherein the determining means determines the presence of a human body regardless of the output of the time measuring means when the output of the signal processing means at the present time is within a predetermined range. 8. A plurality of time measuring means are provided, one of which operates only when the output of the signal processing means at the present time is within a predetermined range, and the output of the time measuring means is a constant value. The human body detection device according to claim 1, wherein the presence of the human body is determined regardless of the outputs of other time measuring means at the above time. 9. A body movement detecting means disposed on a human body supporting portion of a device for supporting a human body such as a seat or a bed, a signal processing means for processing an output of the body movement detecting means, and the signal processing means. First determining means for determining and outputting the possibility of the presence of a human body on the device based on the output of, the time measuring means operating according to the output of the first determining means, and the first determining means. A human body detection device comprising: second determination means for determining the presence of a human body on the device based on the output of the time measuring means.