JP5216169B2 - Biological detection system - Google Patents

Description

  The present invention relates to a living body detection system for confirming whether a person remains in a vehicle.

  In many cases, it is necessary to ensure safety by confirming that all passengers in the vehicle have got off the vehicle or that there are no people remaining in the vehicle.

  For example, in a mechanical parking lot, it is necessary to ensure that all occupants have got off the vehicle accommodated in the parking lot in order to ensure safety. In addition, it is an essential requirement to confirm that all passengers have got off the shuttle bus. In particular, if the passenger is an infant, if left in the vehicle, there is a risk of serious danger, and it cannot be neglected to confirm that there are no passengers remaining in the vehicle. In addition, there are many accidents in which infants are trapped in the trunk of the vehicle, and it is necessary to know if there are people in the trunk before it becomes important.

  On the other hand, preventing entry into a research facility or factory facility or leaving without proper procedures is an important issue for companies that require state-of-the-art research, and whether there are unauthorized visitors to the research facility or factory facility. Alternatively, it is necessary to confirm whether a suspicious person is lurking in the vehicle passing through the gate in order to confirm whether there is a person leaving the site secretly.

  Several methods have been proposed as a system for confirming that all occupants in a vehicle have exited or that there are no people remaining in the vehicle, but most of them have applied load changes to seats in the vehicle. A sensor for detection is provided. In these methods, there is a problem that it is indistinguishable from the case where luggage is placed in the seat.

  Patent Document 1 below discloses an example in which a living body detection system is employed for confirming getting off in a mechanical parking lot. In the living body detection system of this document, a vibration detection sensor is provided in the vehicle, and a signal resulting from the breathing of the living body is detected in the vibration detected by the sensor, so that the passenger in the vehicle has got off the vehicle. I have confirmed. Furthermore, the publication also discloses a method for detecting a living body using an infrared sensor as a detection sensor.

In the living body detection method of this document, since a vibration detection sensor for detecting human breathing as vibration or an infrared sensor for detecting heat of the human body is provided in the vehicle to be detected, it is necessary to provide a sensor in the vehicle in advance. There is a problem that the applicable vehicles are limited.
JP 2006-265822 A

  As described above, the conventional living body detection method in a vehicle requires that a sensor be provided in the vehicle in advance, and can be applied only to a specific vehicle provided with the sensor. There is a problem that it cannot be applied.

  In view of the above problems, an object of the present invention is to provide a living body detection system that can detect whether or not a person remains in a vehicle for all vehicles without the need to mount a special sensor or the like on the vehicle. And

In order to achieve the above object, a living body detection system according to claim 1 includes a detection stage installed outside a parked vehicle so that wheels of the vehicle can be placed thereon, and vibrations of the detection stage. characterized by comprising a vibration detecting sensor for detecting that a transmitting means for transmitting a detection signal obtained by the vibration detecting sensor, and a bio-signal detecting means for detecting the presence of the biological signal during the detection signal of the vibration detecting sensor And According to a second aspect of the present invention, there is provided a living body detection system including a contact pad that is installed outside a parked vehicle and is in contact with a vehicle body of the vehicle, a vibration detection sensor that detects vibration of the contact pad, and the vibration detection sensor. Transmission means for transmitting the obtained detection signal and biological signal detection means for detecting the presence or absence of a biological signal in the detection signal of the vibration detection sensor are provided. The transmission means may be wired or wireless.

According to each of the first and second aspects of the present invention , the vibration of the vehicle is detected by the detection stage or the contact pad provided outside the stopped vehicle and the vibration detection sensor , and the biological signal component is included in the detection signal. By detecting whether or not there is a living body in the vehicle, it can be detected . Since the detection means is provided independently of the vehicle, it can be applied to an unspecified vehicle.

According to the invention of claim 1, the vibration detection unit, a detection stage of forming the wheels of a vehicle can be placed, since the form of the vibration detecting sensor for detecting vibration of the detection stage, the vehicle By simply moving and stopping the vehicle with the wheels placed on the detection stage, it is possible to detect the vibration of the vehicle and easily detect whether a person remains in the vehicle from the detection signal.

According to the invention of claim 2, since the vibration detecting means is formed of the contact pad that contacts the vehicle body of the vehicle and the vibration detection sensor that detects the vibration of the contact pad , the contact pad contacts the vehicle. It is possible to detect vibrations in the vehicle simply by making it happen, and easily detect whether a human remains in the vehicle from the detection signal.

The invention according to claim 3 is the living body detection system according to claim 1 or 2 , wherein the biological signal detection means detects the presence or absence of a living body by detecting a heartbeat signal. It is possible to detect whether or not there is a living body in the vehicle by detecting a signal or a parameter specific to a heartbeat signal.

The invention according to claim 4 is the living body detection system according to claim 1 or 2 , wherein the biological signal detection means detects the presence or absence of a living body by detecting a respiratory signal, It is possible to detect whether or not there is a living body in the vehicle by detecting a signal or a parameter specific to a respiratory signal.

The invention according to claim 5 is the living body detection system according to claim 3 or 4 , wherein the living body signal detection means performs a Fourier transform operation on a signal from a vibration detection sensor installed outside the vehicle body. and detecting the presence or absence of biological by the subjected detected the fundamental and harmonics of the heart rate signal or the respiratory signal.

  Since the conventional biological detection system has a configuration in which a biological detection sensor is provided in the vehicle, there is a problem that it can be applied only to a specific vehicle and cannot be applied to an unspecified vehicle.

  The living body detection system of the present invention realizes detection of whether or not a person is present in an unspecified vehicle, and detects the vibration of the vehicle by a detection stage or detection pad having a simple configuration. The presence of the living body in the vehicle is determined by detecting a signal specific to the biological signal from the detection signal.

  Since the living body detection system of the present invention is provided with the detection stage or the detection pad independently of the vehicle, any vehicle can perform the living body detection.

  Embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment.

  FIG. 1 is an explanatory diagram showing a vibration detection stage and a flow of vibration detection of the living body detection system according to the first embodiment of the present invention, and FIG. 2 shows details of the detection stage.

  The detection stage 1 is provided at a place where a vehicle such as a passage can stop. Although it is displayed in a state of being embedded in the road in FIG. 1, a configuration in which the vehicle is placed on the road may be used if there is no problem in placing the wheel. In the case of a mechanical parking lot, it is provided on the floor of the cage on which the vehicle is placed. As will be described later, the detection stage 1 is provided with a piezoelectric ceramic sensor 6 which is a vibration detection sensor, and the detection signal is sent to the monitoring device 9 by the signal transmission means 8.

  In this embodiment, the signal transmission means 8 is formed by the wireless transmission means 8 a provided in the detection stage 1 and the wireless reception means 8 b provided in the monitoring device 9. In general, the wireless transmission / reception means is used in this embodiment in consideration of the fact that the detection stage 1 and the monitoring device 9 are generally separated from each other. However, the present invention is not limited to this. You can use a wired cable.

  FIG. 2 shows details of the detection stage 1 in a cross-sectional view. The support plate 2 is supported by a support spacer 3 so that the weight of the vehicle can be supported when the vehicle wheel rides on the support plate 2. Further, a sensor mounting plate 5 having elasticity is fixed to the support plate 2 via a sensor mounting spacer 4, and a piezoelectric ceramic sensor 6 is bonded to the sensor mounting plate 5. Further, a block 7 is provided below the piezoelectric ceramic sensor 6 so as to contact the piezoelectric ceramic sensor 6. The support plate 2, the support spacer 3, the sensor mounting spacer 4, the sensor mounting plate 5, and the block 7 are made of steel, but wood or the like may be used.

  The output of the piezoelectric ceramic sensor 6 is connected to the wireless transmission means 8 a and is transmitted to the wireless reception means 8 b provided in the monitoring device 9.

  The monitoring device 9 detects a biological signal from the signal obtained by the signal amplification shaping means 10 for amplifying and shaping the output of the piezoelectric ceramic sensor 6, the FFT operation means 11 for performing a Fourier transformation process on the signal, and the Fourier transformed signal. It comprises a biological signal detection means 12 and an alarm device 13 that issues an alarm when it is detected that the signal contains a biological signal.

  Next, the operation of the living body detection system of this embodiment will be described. After the vehicle wheel for performing the living body detection is placed on the detection stage 1 and stopped, the engine is stopped, and all passengers including the driver are alighted.

  Even when the vehicle is stopped, various vibrations are generated in the vehicle, and when a human remains in the vehicle, vibrations generated by the human body, such as vibration due to body movement, vibration due to breathing, or vibration due to heartbeat Is included in the vibration detected from the vehicle. That is, since the vibration of the vehicle is transmitted to the piezoelectric ceramic sensor 6 via the sensor mounting plate 5 via the vehicle wheel mounted on the detection stage 1, the piezoelectric ceramic sensor 6 is used when a person remains in the vehicle. The detected vibration signal of the vehicle includes a signal specific to the living body. By analyzing this signal, it can be detected that the living body signal is included.

  The vehicle vibration signal detected by the piezoelectric ceramic sensor 6 is sent to the signal amplification / shaping means 10 via the transmission means 8 to amplify the signal so that it can be easily post-processed. Shape it. Here, a heart rate signal is detected as a biological signal, and a filter that passes a signal of 10 Hz or less is used.

  FIG. 3 shows the output signal of the piezoelectric ceramic sensor 6 that is passed through the signal amplification and shaping means 10 and the output of the result obtained by Fourier transforming the signal by the FFT operation means 11. FIG. 3A is a graph showing the vibration signal before the Fourier calculation processing by the FFT calculation means 11 and the time course of the measured value of the pulse wave by the pulse oximeter measured at the same time. FIG. 3B shows a result obtained by performing a Fourier calculation process on the vibration signal of FIG. FIG. 3 (c) shows the result of the Fourier calculation process performed by the FFT calculation means 11 on the pulse wave measurement value obtained by the pulse oximeter of FIG. 3 (a).

  As is clear from FIG. 3C, it can be seen that the fundamental wave and its harmonics clearly appear in the human pulse wave. Therefore, when the vehicle vibration signal obtained from the detection stage 1 is output by performing a Fourier calculation process on the FFT calculation means 11, FIG. 3 (b) is located at substantially the same position as the harmonic of FIG. 3 (c). Harmonics are seen. That is, it can be seen that when a person is in the vehicle, a waveform corresponding to the harmonics of the heartbeat signal is noticeable.

  The biological signal detection means 12 determines whether or not a heartbeat signal, that is, a biological signal is included in the vibration signal by detecting the fundamental wave of the heartbeat signal and its harmonics using the above principle. That is, when the fundamental wave of the heartbeat signal and its harmonics are significant, it can be determined that there is a person in the vehicle.

  In the above description, the example of detecting a heartbeat signal is described as a method of detecting a biological signal from a vibration signal of a vehicle. However, the present invention is not limited to this, and a biological signal is detected by detecting a respiratory signal as a biological signal. Is also possible. In that case, the living body can be detected by detecting the fundamental wave and its harmonics in the vicinity of the fundamental frequency of 0.3 Hz of the respiratory signal.

  If the biological signal detection means 12 determines that there is a biological signal, the alarm device 13 warns that a person remains in the vehicle.

  FIG. 4 is an explanatory diagram showing a vibration detection unit and a detection flow of the living body detection system according to the second embodiment of the present invention. The vibration detection of the vehicle is performed by the vibration detection pad 21 that detects the vibration of the vehicle by contacting a part of the vehicle, and is transmitted to the monitoring device 9 by the wireless transmission means 8. In this embodiment, wireless transmission means is used. However, if there is no problem, the transmission means may use a cable.

  The vibration detection pad 21 is configured to detect vibration by being brought into contact with the vehicle body of the vehicle, and a piezoelectric ceramic sensor for detecting vibration is incorporated therein. The output of the piezoelectric ceramic sensor is transmitted by the wireless transmission means 8a to the wireless reception means 8b provided in the monitoring device 9.

  The monitoring device 9 includes a signal amplification shaping means 10 that amplifies and shapes the output of the piezoelectric ceramic sensor, an FFT calculation means 11 that performs a Fourier transform process on the signal, and a living body that detects a biological signal from the Fourier transformed signal. The signal detection means 12 and an alarm device 13 that issues an alarm when it is detected that a biological signal is included in the signal. The configuration of the monitoring device 9 is the same as that of the first embodiment, and the biological signal detection method of the system is the same as that of the first embodiment.

  In the above description, the heart rate signal and the respiration signal are each used as an index for detecting a biological signal independently. However, the present invention is not limited to this, and the two signals may be detected simultaneously.

  In the above embodiment, the method for detecting the presence or absence of the biological signal by detecting the fundamental wave and the harmonics of the heartbeat signal or the respiratory signal is used as means for determining the presence or absence of the biological signal, but the present invention is not limited to this. Other determination methods may be used.

  In the conventional biometric detection method in a vehicle, it is necessary to provide a sensor in the vehicle in advance, which can be applied only to a specific vehicle provided with the sensor and cannot be applied to an unspecified vehicle. there were.

  The living body detection system of the present invention includes vibration detection means for detecting the vibration of the vehicle in contact with the vehicle body or wheels of the stopped vehicle. The vibration detection means detects any vehicle vibration, The presence or absence of a biological signal can be detected in the detection signal.

  If the present invention is used in a mechanical parking lot, it is possible to detect a living body even when the user leaves the vehicle and puts a foot on the cage, and further safety can be obtained. In addition, when there are passengers on the shuttle bus, especially in the case of infants, even if there is a mistake in the call or visual confirmation, it can be easily detected by the living body detection system of the present invention. Can avoid the danger. Furthermore, it is possible to avoid a serious situation by applying the living body detection system of the present invention to a trunk confinement accident of a vehicle such as an infant.

  On the other hand, the entrance or exit of suspicious persons to the premises such as research facilities and factories was difficult to detect by the conventional method such as visual inspection or confirmation of the number of people when lurking in the truck bed etc. According to the biological monitoring system of the invention, it can be easily found. From this, it is considered that the living body monitoring system of the present invention can be used for border inspection and the like.

  As described above, the living body monitoring system of the present invention is excellent in living body detection capability and can be applied to unspecified vehicles, and thus contributes greatly to the industry.

It is explanatory drawing which shows the outline | summary of the 1st Embodiment of this invention. It is sectional drawing which shows the detail of the detection stage of the 1st Embodiment of this invention. It is a graph which shows a detection result. It is explanatory drawing which shows the outline | summary of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Detection stage 2 Support plate 3 Support spacer 4 Sensor mounting spacer 5 Sensor mounting plate 6 Piezoelectric ceramic sensor 7 Block 8 Wireless transmission means 8a Wireless transmission means 8b Wireless reception means 9 Monitoring device 10 Signal amplification shaping means 11 FFT calculation means 12 Biological signal Detection means 13 Alarm device 21 Vibration detection pad

Claims (5)

A detection stage installed outside the stopped vehicle so that the wheels of the vehicle can be placed thereon, and a vibration detection sensor for detecting vibration of the detection stage ;
Transmission means for transmitting a detection signal obtained by the vibration detection sensor ;
A biological signal detection system comprising: biological signal detection means for detecting presence or absence of a biological signal in a detection signal of the vibration detection sensor . A contact pad that is installed outside the parked vehicle and makes contact with the vehicle body of the vehicle ; and a vibration detection sensor that detects vibration of the contact pad ;
Transmission means for transmitting a detection signal obtained by the vibration detection sensor ;
A biological signal detection system comprising: biological signal detection means for detecting presence or absence of a biological signal in a detection signal of the vibration detection sensor . The living body detection system according to claim 1 or 2 , wherein the living body signal detection means detects the presence or absence of a living body by detecting a heartbeat signal. The biological signal detecting means, a biological detection system according to claim 1 or 2, characterized by detecting the presence or absence of biological by detecting the respiration signal. It said vital sign detecting means, biological by detecting the fundamental and harmonics of the heart rate signal or the respiratory signal is subjected to Fourier transform operation on the signal from the vibration detection sensor installed outside of the vehicle body The living body detection system according to claim 3 , wherein the presence or absence of the detection is detected.

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