JP2017086201A - Passenger state detection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of detecting a passenger state by suppressing the influence of a body motion of a passenger when performing an operation.SOLUTION: A detection apparatus includes: a heart rate sensor 12 for detecting a heart rate of a passenger; an operation detection part 22 for detecting the passenger operating equipment disposed in a vehicle; a calculation process part 18 for calculating a heart rate fluctuation value of the passenger on the basis of the detection result of the heart rate sensor 12, and, in a case where the operation detection part 22 detects the passenger operating equipment, calculating a heart rate fluctuation value produced by eliminating, as an abnormal value, a heart rate fluctuation value corresponding to a period of time where the passenger operating the equipment.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an occupant state detection device that detects the state of an occupant who has boarded a vehicle.

  In Patent Document 1, a plurality of state quantity detection units that are arranged at positions corresponding to a plurality of different parts of the occupant and detect a state quantity relating to the state of the occupant of the vehicle, and based on the detected state quantity, An occupant state detection device including biological information detection means for detecting biological information has been proposed.

JP 2007-061490 A

  However, in Patent Document 1, it is proposed that the state quantity detection means for detecting the state quantity relating to the state of the occupant is arranged at a plurality of different parts. There is room for improvement because the effects of For example, a body movement caused by an operation of a switch or the like while traveling increases the heart rate, and the state quantity related to the state of the occupant may not be accurately analyzed.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to improve the detection accuracy of the occupant state by suppressing the influence of body movement during the operation of the occupant.

  In order to achieve the above object, an invention according to claim 1 includes a detection unit that detects an occupant's heart rate, an operation detection unit that detects an occupant's operation on a device provided in the vehicle, and The heart rate fluctuation value of the occupant is calculated based on the detection result, and when the operation detection unit detects the operation of the occupant on the device, the heart rate corresponding to the time when the operation of the occupant on the device is performed A calculation processing unit that calculates the heartbeat fluctuation value excluding the fluctuation value as an abnormal value.

  According to the first aspect of the present invention, the detection unit detects the occupant's heart rate, and the operation detection unit detects the operation of the occupant on the device provided in the vehicle.

  In the calculation processing unit, the occupant's heart rate fluctuation value is calculated based on the detection result of the detection unit. Here, when an operation of the occupant on the device is detected by the operation detection unit, a heart rate fluctuation value excluding the heart rate fluctuation value corresponding to the time when the operation of the occupant on the device is performed as an abnormal value is calculated. . Thereby, the influence by the body movement at the time of a passenger | crew's operation can be suppressed, and the detection precision of a passenger | crew state can be improved.

  As described above, according to the present invention, there is an effect that it is possible to improve the detection accuracy of the occupant state by suppressing the influence of the body movement during the operation of the occupant.

It is a block diagram which shows schematic structure of the passenger | crew state detection apparatus which concerns on this embodiment. It is a figure which shows the heart rate fluctuation (dotted line) including the change of a heart rate fluctuation (solid line) when a passenger | crew has not performed any operation, and the change of body movement by switch operation, steering operation, etc. FIG. It is a flowchart which shows an example of the flow of the process performed by the heartbeat sensing ECU of the passenger | crew state detection apparatus which concerns on this embodiment.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram illustrating a schematic configuration of an occupant state detection device according to the present embodiment.

  The occupant state detection device 10 includes a heart rate sensor 12 as a detection unit, a heart rate sensing ECU 14 as a calculation processing unit, and an operation detection unit 22.

  The heart rate sensor 12 is provided, for example, in a seat back of a vehicle seat, a seat cushion, a steering wheel, etc., detects the occupant's heart rate as the occupant's biological information, and outputs the detection result to the heart rate sensing ECU 14. As the heart rate sensor 12, for example, a vibration sensor or a pressure sensor may be used.

  The operation detection unit 22 includes various switches 24 provided on the vehicle, a steering angle sensor 26 that detects the amount of steering operation, and the like. It outputs to sensing ECU14. As specific detection examples of the operation detection unit 22, for example, various operations such as a steering operation, a shift operation, a parking brake operation, a brake operation, and an accelerator operation are detected. As another operation to detect, you may detect operation to a mirror, a sheet | seat, a horn, a wiper, a direction indicator etc. including a room mirror, a door mirror, etc., for example. Or you may detect operation to a navigation system, audio, an air-conditioner, a glove box, etc.

  The heartbeat sensing ECU 14 includes a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The heartbeat sensing ECU 14 functions as a filter processing unit 16, a calculation processing unit 18, and a result output unit 20, which will be described later, when a program stored in advance in the ROM is expanded in the RAM and executed by the CPU.

  The filter processing unit 16 performs a filtering process using various filters such as a band pass filter, a low pass filter, and a high pass filter on the detection value of the heart rate sensor 12 to extract a signal having a predetermined frequency component. The result is output to the calculation processing unit 18. That is, the noise component of the detection result of the heart rate sensor 12 is removed by filtering processing.

  The calculation processing unit 18 calculates a heartbeat fluctuation, which is a periodic variation of the occupant's heartbeat interval, as the occupant state, and outputs the calculation result to the result output unit 20. Further, the calculation processing unit 18 performs processing for suppressing the influence on the heartbeat fluctuation due to the body movement of the occupant. Specifically, by detecting various operations of the occupant to the device mounted on the vehicle from the detection result of the operation detection unit 22 and excluding the heartbeat fluctuation value during the operation as an abnormal value, the detection accuracy of the heart rate is improved. We are trying to improve. For example, FIG. 2 shows the change of the heart rate fluctuation calculated by the calculation processing unit 18 over time. A solid line indicates a change in heart rate fluctuation when the occupant is not performing any operation, and a dotted line indicates a heart rate fluctuation including a change in body movement due to a switch operation, a steering operation, or the like. As shown in FIG. 2, heart rate fluctuations fluctuate due to body movement caused by switch operation or steering operation, and the actual heart rate fluctuations of the occupant cannot be detected accurately. Therefore, in the present embodiment, when various operations by the occupant are detected by the operation detection unit 22, the heart rate fluctuation value during the time when the operation is detected is excluded as an abnormal value. In this embodiment, the heart rate fluctuation value corresponding to the time when the operation is detected is excluded as an abnormal value, but the detection result of the heart rate corresponding to the time when the operation is detected is excluded as an abnormal value. A heart rate fluctuation value may be calculated.

  The result output unit 20 outputs the calculation result of the calculation processing unit 18. As an output method, the calculation result of the calculation processing unit 18 may be output in response to a request from another ECU or the like. Alternatively, a display unit may be provided to display and output the calculation result.

  Next, processing performed by the heartbeat sensing ECU 14 of the occupant state detection device 10 according to the present embodiment configured as described above will be described. FIG. 3 is a flowchart illustrating an example of a flow of processing performed by the heartbeat sensing ECU 14 of the occupant state detection device 10 according to the present embodiment. Note that the processing in FIG. 3 is started when, for example, an ignition switch (not shown) is turned on.

  In step 100, the heartbeat sensing ECU 14 starts acquiring the detection result of the heartbeat sensor 12 and proceeds to step 102.

  In step 102, the filter processing unit 16 starts the filtering process of the detection value of the heart rate sensor 12 and proceeds to step 104.

  In step 104, the heartbeat sensing ECU 14 starts acquiring the operation detection result of the operation detection unit 22 and proceeds to step 106.

  In step 106, the calculation processing unit 18 analyzes the heartbeat fluctuation and proceeds to step 108. That is, the calculation processing unit 18 calculates a heart rate fluctuation value by obtaining a periodic variation of the occupant's heart rate interval from the heart rate detected by the heart rate sensor 12.

  In step 108, the heart rate sensing ECU 14 determines whether or not an operation is detected by the operation detection unit 22. The determination is made by, for example, determining whether the operation of various switches 24 or the steering operation is detected by the steering angle sensor 26. If the determination is affirmative, the process proceeds to step 110, and if the determination is negative Goes to step 112.

  In step 110, the calculation processing unit 18 excludes the heartbeat fluctuation value corresponding to the time when the operation is detected by the operation detection unit 22 as an abnormal value, and proceeds to step 112. In other words, since the heart rate fluctuation value corresponding to the operation detection is affected by body movement, by excluding the heart rate fluctuation value corresponding to the time as an abnormal value, the influence of the body movement during the operation of the occupant is suppressed. The detection accuracy of the occupant state can be improved.

  In step 112, the heartbeat sensing ECU 14 determines whether or not to end the analysis of heartbeat fluctuation. This determination is made, for example, by determining whether an ignition switch (not shown) is turned off or whether a predetermined condition for ending the analysis of heartbeat fluctuation is satisfied. If the determination is negative, the process returns to step 106 and the above-described processing is repeated. If the determination is affirmative, the series of processing ends.

  As described above, in the present embodiment, when the occupant is performing some operation, the heart rate fluctuation value corresponding to the time during which the operation is performed is excluded as an abnormal value. It is possible to prevent the influence of body movement.

  In addition, although the process performed by heartbeat sensing ECU14 in said embodiment was demonstrated as a software process performed by running a program, it is good also as a process performed by hardware. Alternatively, the processing may be a combination of both software and hardware. The program stored in the ROM may be stored and distributed in various storage media.

  Furthermore, the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

10 Occupant state detection device 12 Heart rate sensor (detection unit)
14 Heart rate sensing ECU (calculation processing unit)
18 Calculation processing unit 22 Operation detection unit

Claims (1)

A detector for detecting the occupant's heart rate;
An operation detection unit that detects an operation of an occupant to an apparatus provided in the vehicle;
The heart rate fluctuation value of the occupant is calculated based on the detection result of the detection unit, and when the operation of the occupant to the device is detected by the operation detection unit, the time when the occupant operation to the device is performed A calculation processing unit for calculating the heartbeat fluctuation value excluding the corresponding heartbeat fluctuation value as an abnormal value;
An occupant state detection device.

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