JP2019070873A - Alarm information notification device - Google Patents

Abstract

To improve accuracy of detecting a driving state of a driver.SOLUTION: An alarm information notification device 1 includes: an acquisition section 161 for acquiring a physical amount indicating a motion of a seat belt b; a determination section 162 for determining whether or not a frequency component of a change of a physical amount after the acquisition section 161 has acquired a physical amount equal to or more than a predetermined threshold contains a frequency component equal to or more than a predetermined frequency; and a notification section 163 for notifying of alarm information when the determination section 162 determines that the frequency component of the change of the physical amount after acquisition of the physical amount equal to or more than the predetermined threshold contains the frequency component equal to or more than the predetermined frequency.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a warning information notification device.

  Various techniques have been proposed for detecting the state of the driver while driving the vehicle. For example, in Patent Document 1, attention is paid to the fact that the web does not move because the driving operation is not performed when the driver is asleep, so that the driver can easily detect a nap of the vehicle. When it is determined that there is an alarm sound, a technique is disclosed that generates an alarm sound from a speaker.

Registered Utility Model No. 3207515

  Safety can be improved if the driver can be notified that it is difficult to drive due to other factors as well as sleepiness. Although the technology disclosed in Patent Document 1 can detect drowsiness by the fact that the web (hereinafter referred to as a seat belt) does not move, when the driver falls down and convulses due to epilepsy or heart disease, driving Although it is difficult for a person to continue driving, it may not be possible to detect that the driving is difficult. Therefore, there is room for improvement in detection of the driver's driving state.

  Then, this invention is made in view of these points, and an object of the present invention is to provide art which improves detection accuracy of a driver's driving state.

  In the warning information notification device according to one aspect of the present invention, an acquisition unit that acquires a physical quantity indicating movement of a seat belt, and a frequency of a change in the physical quantity after the acquisition section acquires the physical quantity equal to or greater than a predetermined threshold. A determination unit that determines whether the component includes a frequency component equal to or higher than a predetermined frequency, and a frequency component of change in the physical amount after the determination unit acquires the physical amount equal to or higher than the predetermined threshold value; And a notification unit that notifies warning information when it is determined that the frequency component higher than the predetermined frequency is included.

  For example, the acquisition unit acquires the amount of extension of the seat belt as the physical quantity, and the determination unit determines the frequency of the change in the amount of extension after the acquisition unit acquires the amount of extension equal to or greater than a predetermined extension threshold. It is determined whether the component includes a frequency component equal to or higher than a predetermined frequency, and the notification unit determines the frequency of the change in the amount of elongation after the determination unit acquires the amount of elongation equal to or greater than a predetermined elongation threshold. When it is determined that the component includes a frequency component higher than a predetermined frequency, warning information is notified.

  For example, the acquisition unit acquires the extension speed of the seat belt as the physical quantity, and the determination unit is a frequency component of the change in the speed after the acquisition unit acquires the speed equal to or higher than a predetermined speed threshold. Determines whether the frequency component of the predetermined frequency or more includes, and the notification unit determines that the frequency component of the change in the velocity after the determination unit acquires the velocity equal to or greater than the predetermined velocity threshold. When it is determined that a frequency component higher than a predetermined frequency is included, warning information is notified.

  For example, the acquisition unit acquires the acceleration of the expansion of the seat belt as the physical quantity, and the determination unit determines the frequency component of the change in the acceleration after the acquisition unit acquires the acceleration equal to or higher than a predetermined acceleration threshold. Determines whether the frequency component of a predetermined frequency or more is included, and the notification unit determines that the frequency component of the change in the acceleration after the determination unit acquires the acceleration equal to or more than a predetermined acceleration threshold. When it is determined that a frequency component higher than a predetermined frequency is included, warning information is notified.

  The determination unit determines whether or not the intensity of a frequency component higher than the predetermined frequency is higher than the intensity of a frequency component lower than the predetermined frequency component, and the notification unit determines that the predetermined unit The warning information may be notified when it is determined that the strength of the frequency component higher than the frequency is larger than the strength of the frequency component less than the predetermined frequency component.

  The determination unit determines whether the intensity of a frequency component higher than the predetermined frequency is larger than the maximum value of the intensities of a plurality of frequency components less than the predetermined frequency component, and the notification unit determines The warning information may be notified when the unit determines that the strength of the frequency component higher than the predetermined frequency is larger than the maximum value of the strength of the plurality of frequency components less than the predetermined frequency component.

  According to the present invention, it is possible to improve the detection accuracy of the driving state of the driver.

It is a figure for demonstrating the outline | summary of embodiment. It is a figure which shows the function structure of the alert information notification apparatus which concerns on embodiment. It is a figure which shows typically the time change of the amount of extension of a seat belt. It is a figure for demonstrating determination of a frequency component. It is a figure which shows typically the time change of the extension speed of a seat belt. It is a figure which shows typically the time change of the acceleration of expansion of a seat belt. It is an operation | movement flowchart of the warning information notification apparatus which concerns on embodiment.

<Overview of Embodiment>
FIG. 1 is a diagram for explaining the outline of the embodiment. The outline of the embodiment will be described with reference to FIG. In FIG. 1, it is assumed that the driver U is driving a vehicle equipped with the warning information notification device. FIG. 1A is a schematic view assuming that the driver is operating in a normal state. In FIG. 1A, the driver holds the steering wheel and faces the front to drive the vehicle. At this time, the seat belt b extends along the body of the driver U.

  FIG. 1B is a schematic view that assumes that the driver U has difficulty driving the vehicle. In FIG. 1 (b), the driver U releases his hand from the steering wheel, falls over so as to cover the steering wheel and convulses, which makes driving difficult. At this time, the seat belt b extends longer than when the driver U is in a normal state. In addition, the seat belt b vibrates due to the driver U being cramped. The warning information notification device notifies warning information when the vibration of the seat belt b is detected. Hereinafter, the functional configuration of the warning information notification device will be described in detail.

<Functional Configuration of Warning Information Notification Device 1 According to Embodiment>
FIG. 2 is a diagram showing a functional configuration of the warning information notification device 1 according to the embodiment. The warning information notification device 1 includes a sensor 11, a communication unit 12, an audio output unit 13, a display unit 14, a storage unit 15, and a control unit 16.

  The sensor 11 is a sensor that detects a physical quantity that indicates the movement of the seat belt b. The sensor 11 is, for example, a displacement sensor that detects an expansion amount of the seat belt b, a speed sensor that detects an expansion speed of the seat belt b, or an acceleration sensor that detects an acceleration of the expansion of the seat belt b. The sensor 11 may be at least one of a displacement sensor, a velocity sensor, or an acceleration sensor. The communication unit 12 is a communication module for transmitting and receiving information to and from an external device via a network. The network is, for example, the Internet.

  The audio output unit 13 is a speaker for outputting audio. The display unit 14 is a display installed on a meter panel of a vehicle equipped with the warning information notification device 1 in order to display various types of information.

  The storage unit 15 is, for example, a read only memory (ROM) or a random access memory (RAM). The storage unit 15 stores various programs for causing the control unit 16 to function. The control unit 16 implements the functions of the acquisition unit 161, the determination unit 162, and the notification unit 163 by executing the program stored in the storage unit 15.

  The acquisition unit 161 acquires a physical quantity that indicates the movement of the seat belt b. Specifically, the acquisition unit 161 acquires time-series data of the physical quantity detected by the sensor 11. For example, when the sensor 11 is a displacement sensor, the acquisition unit 161 acquires the amount of extension of the seat belt b as a physical quantity. For example, when the sensor 11 is a speed sensor, the acquisition unit 161 acquires the speed of extension of the seat belt b as a physical quantity. For example, when the sensor 11 is an acceleration sensor, the acquisition unit 161 acquires the acceleration of the expansion of the seat belt b as a physical quantity. The acquisition unit 161 notifies the determination unit 162 of the acquired physical quantity.

  The determination unit 162 determines whether the frequency component of the change in physical quantity after the acquisition unit 161 acquires the physical quantity equal to or more than the predetermined threshold value includes the frequency component equal to or more than the predetermined frequency. Specifically, the determination unit 162 analyzes the physical quantity acquired in a predetermined period, and specifies the frequency component of the physical quantity. The determination unit 162 specifies the frequency component by performing, for example, Fourier analysis, but the invention is not limited to this, and the frequency component may be specified by a known frequency analysis method. The determination unit 162 determines whether the identified frequency component includes a frequency component equal to or higher than a predetermined frequency.

  The predetermined threshold is a falling estimation threshold necessary for the determination unit 162 to estimate that the driver U has fallen to the front. The estimated threshold value necessary to estimate that the driver U has fallen to the previous position is determined by the manufacturer of the warning information notification device 1 by experiment or the like in consideration of the room necessary for not presuming that the driver U has fallen to the previous position. It should be determined. The specific value of the predetermined threshold may be determined appropriately according to the sensor 11 to be used.

  The predetermined period is a determination time necessary for the determination unit 162 to determine that the seat belt b is vibrating by analyzing the physical quantity. The determination time may be determined by an experiment or the like by the manufacturer of the warning information notification device 1 in consideration of a room necessary for not erroneously determining that the seat belt b is vibrating. The determination unit 162 may determine the unit time based on vehicle information such as the traveling speed of the vehicle or the type of the vehicle. The determination unit 162 may determine the unit time based on road information of the road on which the vehicle is traveling and environment information such as whether or not another vehicle is present around the vehicle. The determination unit 162 may appropriately determine the unit time according to the type of physical quantity acquired by the acquisition unit 161.

  The predetermined frequency is a vibration determination threshold value necessary for the determination unit 162 to determine that the seat belt b is vibrating. The vibration determination threshold value may be determined by the manufacturer of the warning information notification device 1 in consideration of a room necessary for not erroneously determining that the seat belt b is vibrating. The specific value of the predetermined frequency is to use the same value regardless of the sensor 11 in consideration of the fact that the vibration of the physical amount generated by the spasm is equivalent regardless of the type of the physical amount. preferable.

  For example, when the obtaining unit 161 obtains the amount of extension of the seat belt b, the determination unit 162 determines that the frequency component of the change in the amount of extension after the obtaining unit 161 obtains the amount of extension equal to or greater than a predetermined extension threshold. It is determined whether a frequency component higher than the frequency is included. The predetermined elongation threshold is a collapse estimation threshold necessary to estimate that the driver U has fallen forward.

  FIG. 3: is a figure which shows typically the time change of the elongation amount of the seat belt b. In FIG. 3, the horizontal axis indicates time t, the vertical axis indicates the amount of extension E of the seat belt b, and the broken line L0 indicates the extension threshold. In FIG. 3, the plot of the time change of the amount of extension of the acquired seat belt b is shown. As shown in FIG. 3, at time T, the amount of elongation equal to or greater than the elongation threshold was obtained. The determination unit 162 specifies the frequency component of the change in the amount of elongation by performing frequency analysis on the amount of elongation acquired after the amount of elongation equal to or greater than the elongation threshold is acquired.

  The determination unit 162 may determine whether the intensity of the frequency component higher than the predetermined frequency is higher than the intensity of the frequency component lower than the predetermined frequency component. For example, the determination unit 162 determines whether the intensity of the frequency component higher than the predetermined frequency is larger than the maximum value of the intensities of the plurality of frequency components less than the predetermined frequency component.

  FIG. 4 is a diagram for describing determination of frequency components. In FIG. 4, the horizontal axis indicates the frequency component, and the vertical axis indicates the intensity of the frequency component. FIG. 4: is the schematic diagram which carried out the Fourier analysis of the time change of the extension amount of the seat belt b, and plotted the relationship between the frequency component of extension amount, and intensity | strength. In FIG. 4, a plot of frequency components (f0, f1, f2, f3) less than a predetermined frequency K indicated by alternate long and short dashed lines and frequency components (f4) higher than the frequency K is shown as frequency components. The determination unit 162 specifies the maximum value I of the intensities of the plurality of frequency components (f1, f2, and f3) except for the frequency component f0 which is the direct current component of the change in elongation amount of the frequency component f0. In FIG. 4, the maximum value I of the intensities of the plurality of frequency components (f 1, f 2, and f 3) less than the predetermined frequency component is indicated by a broken line.

  Whether the intensity of the frequency component (f4) above the frequency K is greater than the maximum value I after the determination section 162 determines that the frequency component of the change in the expansion amount specified contains a frequency component above the frequency K It is determined whether or not. By doing this, the determination unit 162 can improve the accuracy of detecting the vibration of the seat belt b.

  For example, when the acquisition unit 161 acquires the extension speed of the seat belt b, the determination unit 162 determines that the frequency component of the change in speed after the acquisition unit 161 acquires the speed equal to or higher than the predetermined speed threshold has a predetermined frequency. It is determined whether the above frequency components are included. The predetermined speed threshold is a falling estimation threshold necessary for the determination unit 162 to estimate that the driver U has fallen to the front.

  FIG. 5: is a figure which shows typically the time change of the speed of elongation of the seat belt b. In FIG. 5, the horizontal axis indicates time t, the vertical axis indicates the speed v of the extension of the seat belt b, and the broken line L1 indicates the speed threshold. In FIG. 5, the plot of the time change of the elongation speed of the acquired seat belt b is shown. As shown in FIG. 5, at time T, a velocity equal to or higher than the velocity threshold was acquired. The determination unit 162 identifies the frequency component of the change in velocity by, for example, performing Fourier analysis on the velocity acquired after the velocity equal to or higher than the velocity threshold is acquired. The determination unit 162 determines whether the identified frequency component includes a frequency component equal to or higher than a predetermined frequency.

  For example, when the acquisition unit 161 acquires the acceleration of elongation of the seat belt b, the determination unit 162 determines that the frequency component of the change in acceleration after the acquisition unit 161 acquires the acceleration equal to or higher than the predetermined acceleration threshold has a predetermined frequency. It is determined whether the above frequency components are included. The predetermined acceleration threshold is a collapse estimation threshold necessary for the determination unit 162 to estimate that the driver U has fallen to the front.

  FIG. 6 is a view schematically showing a time change of acceleration of extension of the seat belt b. In FIG. 6, the horizontal axis indicates time t, the vertical axis indicates the acceleration a of the extension of the seat belt b, and the broken line L2 indicates the acceleration threshold. In FIG. 6, the plot of the time change of the elongation acceleration of the acquired seat belt b is shown. As shown in FIG. 6, at time T, a velocity equal to or higher than the acceleration threshold was acquired. The determination unit 162 specifies the frequency component of the change in acceleration by, for example, performing a Fourier analysis on the acceleration acquired after the velocity equal to or higher than the acceleration threshold is acquired. The determination unit 162 determines whether the identified frequency component includes a frequency component equal to or higher than a predetermined frequency.

  The notification unit 163 notifies warning information when the determination unit 162 determines that the frequency component of the change in physical quantity after acquiring the physical quantity equal to or more than the predetermined threshold value includes the frequency component equal to or more than the predetermined frequency. The warning information is state information obtained by estimating the state of the driver U, confirmation information for confirming that the driver U is difficult to drive, or abnormality information indicating that the driver U is difficult to drive. The state information is, for example, voice data for causing the voice output unit 13 to output a voice indicating that the vibration of the seat belt b is detected. The state information is image data for displaying text or an image indicating that the vibration of the seat belt b has been detected, for example, on the display unit 14.

  The confirmation information is, for example, audio data to be output to prompt the audio output unit 13 to perform an operation indicating that the driver U is normal. The operation indicating normality is, for example, an operation of raising the body where the driver U has fallen and making the amount of extension of the seat belt b equal to or less than a predetermined extension threshold value. The confirmation information is, for example, text or image data displayed on the display unit 14 in order to prompt the driver U to perform an operation indicating normality.

  If the notification unit 163 determines that the operation indicating normality is not performed, the notification unit 163 notifies the predetermined external device of the abnormality information via the communication unit 12. The predetermined external device is, for example, a police and related organizations, a medical institution such as a hospital, a group that manages and operates a road on which a vehicle is traveling, or a communication terminal set by a driver.

  The notification unit 163 may notify the vehicle control device installed in the vehicle of the warning information. The vehicle control device is a control device that controls various devices mounted on the vehicle, such as a steering angle, a speed, or a hazard lamp of the vehicle. For example, when the vehicle control device acquires, as warning information, abnormality information indicating that the driver U is difficult to drive from the notification unit 163, the vehicle control device controls the vehicle to stop. For example, the vehicle control device blinks the hazard lamp and controls the steering angle to decelerate the vehicle and head toward the roadside zone or shoulder of the road on which the vehicle travels. The vehicle control device stops the vehicle at a roadside zone or shoulder of the road. Thus, since the vehicle control device can stop the vehicle, the notification unit 163 can reduce the occurrence of an accident of the vehicle.

  For example, when the acquisition unit 161 acquires the elongation speed of the seat belt b, the notification unit 163 determines that the frequency component of the change in the amount of elongation after the determination unit 162 acquires the amount of elongation equal to or greater than a predetermined elongation threshold. The warning information is notified when it is determined that the frequency component higher than the frequency is included. For example, when the acquisition unit 161 acquires the elongation speed of the seat belt b, the notification unit 163 determines that the frequency component of the change in speed after the judgment unit 162 acquires the speed equal to or higher than the predetermined speed threshold has a predetermined frequency. If it is determined that the above frequency components are included, warning information is notified. For example, when the acquisition unit 161 acquires the acceleration of elongation of the seat belt b, the notification unit 163 determines that the frequency component of the change in acceleration after the determination unit 162 acquires the acceleration equal to or higher than the predetermined acceleration threshold has a predetermined frequency. If it is determined that the above frequency components are included, warning information is notified.

  FIG. 7 is an operation flowchart of the warning information notification device 1 according to the embodiment. The flow of the operation of the warning information notification device 1 according to the embodiment will be described with reference to FIG. First, the acquisition unit 161 acquires the physical quantity detected by the sensor 11 (step S1). Next, the determination unit 162 determines whether or not a physical quantity equal to or greater than a predetermined threshold has been acquired (step S2). If the determining unit 162 determines that a physical amount equal to or greater than a predetermined threshold is not acquired (No in step S2), the determining unit 162 waits until the acquiring unit 161 acquires a physical amount equal to or greater than the predetermined threshold. If the determining unit 162 determines that a physical quantity equal to or greater than a predetermined threshold has been acquired (Yes in step S2), it determines a frequency component of a change in physical quantity acquired after acquiring a physical quantity equal to or greater than the predetermined threshold (step S3).

  The determination unit 162 determines whether the identified frequency component includes a frequency component equal to or more than a predetermined value (step S4). If the determination unit 162 determines that the identified frequency component does not include a frequency component equal to or greater than a predetermined value (No in step S4), the process ends. If the determination unit 162 determines that the identified frequency component includes a frequency component equal to or higher than a predetermined value (Yes in step S4), the notification unit 163 notifies warning information (step S5). By repeating the above operation, the warning information notification device 1 can notify the warning information.

[Effect of warning information notification device 1 according to the embodiment]
As described above, the warning information notification device 1 can improve the detection accuracy of the driving state of the driver U. In particular, the determination unit 162 of the warning information notification device 1 determines whether the frequency component of the change of the physical quantity after acquiring the physical quantity equal to or more than the predetermined threshold value includes the frequency component equal to or more than the predetermined frequency. By doing this, the warning information notification device 1 can detect that the body of the driver U is spasm. Generally, when the driver U develops epilepsy or heart disease, the body of the driver U convulses, so the warning information notification device 1 detects that the body of the driver U is convulsing, whereby the driver U drives It can detect that it is a difficult state. Further, the notification unit 163 notifies warning information when the determination unit 162 determines that the seat belt b is vibrating. By doing this, the warning information notification device 1 can notify the warning information when detecting that the driver U is in a difficult driving state.

  As mentioned above, although the present invention was explained using an embodiment, the technical scope of the present invention is not limited to the range given in the above-mentioned embodiment, and various modification and change are possible within the range of the gist. is there. For example, a specific embodiment of device distribution and integration is not limited to the above embodiment, and all or a part thereof may be functionally or physically distributed and integrated in any unit. Can. In addition, new embodiments produced by any combination of a plurality of embodiments are also included in the embodiments of the present invention. The effects of the new embodiment generated by the combination combine the effects of the original embodiment.

1 warning information notification device 11 sensor 12 communication unit 13 voice output unit 14 display unit 15 storage unit 16 control unit 161 acquisition unit 162 determination unit 163 notification unit

Claims (6)

An acquisition unit that acquires a physical quantity that indicates the movement of the seat belt;
A determination unit that determines whether a frequency component of a change in the physical quantity after the acquisition unit acquires the physical quantity equal to or greater than a predetermined threshold value includes a frequency component equal to or higher than a predetermined frequency;
A notification unit that notifies warning information when it is determined that the frequency component of the change of the physical quantity after acquiring the physical quantity equal to or more than the predetermined threshold value includes the frequency component of the predetermined frequency or more. When,
Warning information notification device comprising: The acquisition unit acquires an expansion amount of a seat belt as the physical quantity,
The determination unit determines whether the frequency component of the change in the elongation amount after the acquisition unit acquires the elongation amount equal to or greater than a predetermined elongation threshold value includes a frequency component equal to or higher than a predetermined frequency.
The notification unit warns when it is determined that the frequency component of the change in the elongation amount after the determination unit acquires the elongation amount equal to or more than a predetermined elongation threshold value includes a frequency component of a predetermined frequency or more. To notify,
The warning information notification device according to claim 1. The acquisition unit acquires a speed of extension of a seat belt as the physical quantity,
The determination unit determines whether the frequency component of the change in velocity after the acquisition unit acquires the velocity equal to or higher than a predetermined velocity threshold value includes a frequency component equal to or higher than a predetermined frequency.
The notification unit notifies warning information when it is determined that the frequency component of the change in velocity after the determination unit acquires the velocity equal to or higher than a predetermined velocity threshold value includes a frequency component higher than or equal to a predetermined frequency. Do,
The warning information notification device according to claim 1 or 2. The acquisition unit acquires, as the physical quantity, an acceleration of elongation of a seat belt,
The determination unit determines whether the frequency component of the change in the acceleration after the acquisition unit acquires the acceleration equal to or higher than a predetermined acceleration threshold value includes a frequency component equal to or higher than a predetermined frequency.
The notification unit notifies warning information when it is determined that the frequency component of the change in the acceleration after the determination unit acquires the acceleration equal to or higher than a predetermined acceleration threshold includes a frequency component equal to or higher than a predetermined frequency. Do,
The warning information notification device according to any one of claims 1 to 3. The determination unit determines whether the intensity of a frequency component higher than the predetermined frequency is higher than the intensity of a frequency component lower than the predetermined frequency component.
The notification unit notifies warning information when the determination unit determines that the intensity of the frequency component higher than the predetermined frequency is higher than the intensity of the frequency component lower than the predetermined frequency component.
The warning information notification device according to any one of claims 1 to 4. The determination unit determines whether the intensity of the frequency component higher than the predetermined frequency is larger than the maximum value of the intensities of the plurality of frequency components less than the predetermined frequency component.
The notification unit notifies warning information when the determination unit determines that the intensity of the frequency component higher than the predetermined frequency is greater than the maximum value of the intensities of the plurality of frequency components less than the predetermined frequency component. Do,
The warning information notification device according to claim 5.

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