JP4962360B2 - Biological signal detection device - Google Patents

Description

  The present invention relates to a biological signal detection apparatus for detecting a biological signal indicating a cardiac potential or a pulse wave.

  Conventionally, an electrocardiographic sensor and a pulse wave sensor (hereinafter collectively referred to as a biosensor) for measuring an electrocardiogram and a pulse wave are installed on a steering wheel (hereinafter simply referred to as a steering) of a vehicle. A physical condition management device that monitors the physical condition of a vehicle driver by recording a detection signal (an electrocardiogram signal, a pulse wave signal) obtained from a biological sensor by grasping a steering wheel during driving is known (for example, a patent) Reference 1).

In this physical condition management device, the electrocardiographic sensor detects a potential difference generated between each electrode when the left and right hands of the measurement subject are in contact with the pair of left and right electrodes provided on the left and right of the steering rim, and the pulse wave The sensor detects a change in the volume of the blood vessel (change in the blood flow) from the fingertip of the measurement subject using a photoelectric element (light emitting element, light receiving element) provided on the steering spoke.
JP-A-6-22914

  By the way, when a physical condition abnormality of a vehicle driver is read from an electrocardiogram signal or a pulse wave signal (hereinafter collectively referred to as a biological signal) recorded by the physical condition management device, a notification for prompting the driver to stop the vehicle, In addition, it is desired to perform vehicle control and the like (hereinafter collectively referred to as safety ensuring control) in which the brake is automatically operated to stop the vehicle and the vehicle is gradually decelerated.

  In particular, in today's aging society, not only is it necessary to protect the body of elderly people who are driving, but also when the driver is unable to operate due to cardiovascular abnormalities such as a heart attack. From the viewpoint of preventing the occurrence of serious accidents, the importance of such safety control is increasing, and as a result, it is necessary to accurately determine biological signals from the need to accurately determine the physical condition of the vehicle driver. It is required to detect well.

  However, in the conventional physical condition management device, since the biosensor is fixed in advance at a predetermined position of the steering, the fixed position of the biosensor does not always match the steering position of the steering, which is different for each driver. However, there is a problem that the restriction that the position of the hand on the steering wheel must be set to the fixed position occurs.

  In addition, in order to eliminate the above-described restrictions with the conventional physical condition management device, it is necessary to provide a biosensor with a size that covers a wide area on the steering wheel. In this case, the biometric sensor is generated from another electronic device mounted on the vehicle. There is a problem that noise caused by electromagnetic waves or external light around the vehicle easily enters from the electrodes and the photoelectric elements, and as a result, the detection accuracy of the biological signal may be lowered.

  In order to solve the above-described problems, an object of the present invention is to provide a biological signal detection device capable of detecting a biological signal with high accuracy according to a driver.

  The biological signal detection apparatus according to claim 1, which is made to achieve the above object, is an apparatus provided in a vehicle, and detects a biological signal representing a cardiac potential or a pulse wave of a driver of the vehicle. And the living body detection unit is provided on a vehicle member (steering wheel, seat, etc.) that the driver contacts at least during driving, and the installation position is within an adjustment range set in advance according to the vehicle member. It is attached to be adjustable.

  Therefore, according to the biological signal detection device of the present invention, the installation position of the biological detection unit (hereinafter referred to as the detection unit position) is variable even if the biological detection unit has a relatively small shape in order to suppress noise as much as possible. For this reason, the restriction that the contact position on the vehicle member has to be matched with the position of the detection unit is alleviated, and as a result, the biological signal can be accurately detected according to the driver.

Specifically, the biological signal detecting apparatus, the finger radical 113 is the biological detection portion is movably supported within the adjustment range, the drive means provides a driving force for moving the biological detection portion to the support portion , the control unit that controls the drive means.

  If such an adjustment mechanism (supporting unit, driving unit, control unit) is used, even when the living body detecting unit is provided in a place where the driver cannot reach, such as the inside of a vehicle member, for example. The position of the detection unit can be adjusted reliably.

Then, the biological signal detecting apparatus, tangential touch detecting means detects the contact area of the driver within the adjustment range of the vehicle member, the control means, installation of the biological detection portion within the contact range detected by the contact detecting means position intends line the automatic adjustment process for adjusting the.

  According to the biological signal detection device configured as described above, it is possible to automatically adjust the position of the detection unit without causing the driver to perform a special operation, thereby further improving the convenience of the driver. Can do.

Further, the biological signal detecting apparatus, situation acquiring means acquires the traveling conditions of the vehicle, the automatic adjustment process, based on the correspondence between the preset driving situation and position on the vehicle member, the state acquisition means the position on the vehicle member identified from the acquired driving situation by, shall be the installation position of the biological detection portion.

  According to the biological signal detection device configured as described above, the position of the detection unit can be automatically adjusted in accordance with the movement of the driver's body related to the driving situation (for example, heel etc.). Even when the vehicle is traveling, the person to be measured can be concentrated on driving.

Here, the biological signal detection apparatus, determine a constant means, the shape of the cardiac potential or reference waveform is the reference made waveform of the pulse wave, and the waveform shape of the detected biological signal by the biometric detector is similar to determine dolphin not, control means, after the automatic adjustment process, intends row fine adjustment process for matching the installation position of the biological detection portion at a position on the vehicle member when the determination means determines to be similar.

  According to the biological signal detection device configured as described above, the detection unit position adjustment accuracy can be improved by matching the detection unit position with the position where accurate measurement of the biological signal is obtained.

Note that, as described in claim 2 , the correspondence relationship is preferably such that the travel situation acquired by the situation acquisition unit is associated with the position on the vehicle member when it is determined that the determination unit is similar. In this case, adjustment accuracy can be improved at the stage of automatic adjustment processing .
According to another aspect of the biological signal detection apparatus, the operation input unit inputs an operation command from the driver, and the control unit receives a command from the biological detection unit based on the operation command input by the operation input unit. Manual adjustment processing for adjusting the installation position may be performed.
According to the biological signal detection device configured as described above, the position of the detection unit can be indirectly adjusted by the driver himself, for example, via a switch or the like, thereby improving the convenience of the driver. it can.
Note that, as described in claim 4, if the traveling state is the speed of the vehicle or the type of road on which the vehicle is traveling, for example, the difference between high speed traveling and low speed traveling, The movement of the driver's body according to the difference or the like can be reflected in the automatic adjustment of the detection unit position.

In addition, as described in claim 5 , the biological signal detection apparatus preferably prohibits the detection of the biological signal by the biological detection unit when the prohibiting unit exceeds a preset threshold value. In this case, accurate measurement results can be aggregated by omitting measurement of the biological signal when the driver's body movement is large.

The vehicle member may be a steering wheel as described in claim 6. In this case, the driver's hand skin can be directly brought into contact with the living body detection unit, and the biological signal can be simply and accurately. Can be detected.

Embodiments of the present invention will be described below with reference to the drawings.
<Overall configuration>
FIG. 1 is a block diagram showing an outline of a configuration of a biological signal detection device to which the present invention is applied and an in-vehicle LAN to which the biological signal detection device is connected.

  As shown in FIG. 1, an in-vehicle LAN (Local Area Network) 10 to which the biological signal detection device 1 is connected includes an engine electronic control device (hereinafter referred to as an ECU) 2 that executes engine control, A navigation device 4 is connected together with various ECUs such as an ESC ECU 3 that executes vehicle stability control (hereinafter referred to as ESC) that ensures traveling stability during vehicle turning.

  Among these, the engine ECU 2 transmits the detection data (vehicle speed) from the vehicle speed sensor 11 to the biological signal detection device 1 via the in-vehicle LAN 10, and the inter-vehicle distance from the preceding vehicle and the vehicle's own vehicle via the in-vehicle LAN 10. Data such as a target acceleration and a fuel cut request is received from an inter-vehicle control ECU (not shown) that controls the speed. And it is comprised so that an internal combustion engine (here gasoline engine) may be controlled so that it may be in the driving | running state specified from the received data.

  The ESC ECU 5 transmits detection data (brake operation state, yaw rate) from the brake depression amount sensor 12 and the yaw rate sensor 13 to the biological signal detection device 1 via the in-vehicle LAN 10. The engine output and the braking force of each wheel are automatically controlled in order to suppress the side slip that occurs when entering a slippery road surface curve and ensure the stability of the vehicle. .

  Based on the detection data from the GPS device 14 and the input data from the map data input device 15, the navigation device 4 displays a map around the vehicle, sets a route to a set destination, and controls guidance by voice. And road data indicating the road type (general road, highway) at the current position of the vehicle is transmitted to the biological signal detection apparatus 1 via the in-vehicle LAN 10.

<Configuration of biological signal detection device>
The biological signal detection device 1 is provided in a vehicle and includes a biological sensor group 21 for detecting the biological state of the driver, a pressure sensor 22 for detecting pressure received from a part of the driver's body, and the biological sensor group 21. A drive unit 23 for moving the installation position of the vehicle, a bus controller 24 for transmitting and receiving various data via the in-vehicle LAN 10, an operation input unit 25 for inputting various settings and operation commands by a vehicle user, and sensors 21 , 22 and a non-volatile memory (for example, EEPROM) 26 for storing various data input via the bus controller 24, a display unit 27 for displaying images, and an audio output unit 28 for outputting audio. , Various processes are executed in accordance with inputs from the sensors 21, 22, the bus controller 24 and the operation input unit 25, and the drive unit 23, the display unit 27, and the audio output unit 2 And a control unit 20 for controlling.

  The biosensor group 21 includes an electrocardiographic sensor 21a that outputs an electrocardiographic signal representing a driver's electrocardiogram using a pair of electrode portions 40 (see FIG. 2A), and an optical element 50 (FIG. a) and a pulse wave sensor 21b that outputs a pulse wave signal representing the driver's pulse wave. The drive unit 23 includes a first drive motor 23a for moving the electrocardiographic sensor 21a and a second drive motor 23b for moving the pulse wave sensor 21b.

  FIG. 2 is an explanatory diagram showing an arrangement state of the biosensor group 21, the pressure sensor 22, and the drive unit 23 in the vehicle according to the present embodiment. 2A is a front view of a steering wheel (hereinafter simply referred to as a steering) 30 as viewed from the driver's seat side, and FIG. 2B is a side view of the steering 30. FIG.

  As shown in FIG. 2A, the left and right grip portions of the steering rim in the steering 30 are provided with a pair of left and right electrode portions 40 (left electrode portion 40L, right electrode portion 40R) and these electrode portions 40 around the steering wheel. A rim side support portion 31 that is movably supported in the direction is provided. In addition, each electrode part 40 (40L, 40R) of this embodiment consists of the 1st electrode 41 (41L, 41R) and the 2nd electrode 42 (42L, 42R), as shown in FIG.2 (b). It is configured as an electrode pair. Further, a pressure sensor 22 is provided in a movable range of the electrode portion 40 in the steering rim in order to detect an operator's grip position with respect to the steering 30.

  On the other hand, a light emitting diode (LED: light emitting element) 51, a photodiode (PD: light receiving element) 52, and these optical elements 50 (LED 51, PD 52) can be moved in the left-right direction of the steering wheel 30. And a spoke-side support portion 32 to be supported on the respective sides.

  The electrocardiographic sensor 21a uses the electrode unit 40 to output a signal based on a potential difference generated between the electrode units 40L and 40R when the left and right hands of the person to be measured contact the electrode unit 40. Is configured to output as

  Further, the pulse wave sensor 21b uses the optical element 50 described above, and the light emitted from the LED 51 toward the measurement subject reaches the capillary artery passing through the measurement subject's body, and in the blood flowing through the capillary artery The PD 52 is configured to output a signal based on the received light amount as a pulse wave signal when the PD 52 receives a part of the scattered light reflected without being absorbed by the hemoglobin.

FIG. 3 is a schematic diagram for explaining the mechanism of the rim-side support portion 31.
As shown in FIG. 3, the rim side support portion 31 is a so-called rack-and-rack comprising a rack 31 a formed integrally with the electrode portion 40 and cut into a flat bar and a pinion 31 b which is a small-diameter circular gear. When a rotational force is applied to the pinion 31b by the pinion via the worm 31c connected to the first drive motor 23a, the electrode unit 40 has a mechanism that can move to the end of the rack 31a. That is, the rim side support portion 31 is configured to be able to adjust the installation position of the electrode portion 40 within the movable range in the circumferential direction of the steering wheel 30 in accordance with the number of pulses input to the first drive motor 23 a.

  The spoke-side support portion 32 is substantially the same as the configuration of the rim-side support portion 31, and therefore illustration and detailed description thereof are omitted. However, depending on the number of pulses input to the second drive motor 23b, the optical element 50 is used. Is configured to be adjustable within a movable range in the left-right direction of the steering wheel 30.

  Returning to FIG. 1, the display unit 27 is a color display device such as a liquid crystal display, an organic EL display, a CRT, or a head-up display, any of which may be used, and a dedicated device for the device. You may provide, and the thing already installed for the navigation apparatus 4 may be used.

  The operation input unit 25 includes, for example, a touch switch integrated with the display unit 27, a mechanical switch, a remote controller, or the like, any of which may be used, an operation command for moving the biosensor group 21, A setting command for setting an adjustment mode, which will be described later, is input.

  The memory 26 includes waveform data indicating a waveform (hereinafter referred to as a reference waveform) serving as a reference for cardiac radio waves and pulse waves, setting data indicating various settings made by the driver via the operation input unit 25, and a biosensor group. Sensor position data indicating 21 installation positions (hereinafter simply referred to as sensor positions) is stored.

  Further, the memory 26 stores signal data (hereinafter referred to as biological signal data) obtained by A / D-converting detection signals (electrocardiographic signals, pulse wave signals; hereinafter collectively referred to as biological signals) from the biological sensor group 21. An area for storing a preset retention period (hereinafter referred to as a signal storage area), an area for storing sensor position data in association with the road type and vehicle speed (hereinafter referred to as a position storage area), etc. Is provided.

  The control unit 20 is configured around a well-known microcomputer including a CPU, ROM, RAM, I / O, a bus line connecting these components, and the like based on a program stored in the ROM. The biological signal measurement process and the sensor position adjustment process described in the above are executed. Although not shown, the control unit 20 includes an A / D conversion circuit, A / D converts signals input from the biological sensor group 21 (and the pressure sensor 22), and converts the converted signal data. It is configured to store in the memory 26.

  In addition to the above processing, the control unit 20 receives a biological signal from the biological sensor group 21 and writes a biological signal data in the signal storage area of the memory 26 (hereinafter referred to as data writing processing) The sensor position is calculated based on the number of pulses output to the drive unit 23, and the process of storing the sensor position data representing the calculated sensor position in the memory 26 (hereinafter referred to as sensor position calculation process) is executed. Has been.

  In the data writing process, the contact impedance between the plurality of (four in the present embodiment) electrodes 41 and 42 and the driver's hand is measured, and the left and right electrode portions 40 used for measuring the electrocardiogram waveform are measured. When a set is set and a plurality of sets of electrode units 40 can be set, an electrocardiographic waveform is measured using each set of electrode units, and the noise is reduced by adding the measurement results. We are processing.

<Biological signal measurement processing>
Here, the biological signal measurement processing executed by the CPU of the control unit 20 will be described in detail along the flowchart shown in FIG. This process is started when the biological signal detection apparatus 1 is turned on, and is executed in parallel with a sensor position adjustment process described later until the power is turned off. In addition, as an initial setting when the power is turned on, the processing flag indicating the progress status of the data writing process is set to 0 indicating that the biological signal data is not being written to the signal storage area of the memory 26.

  First, when this process is started, in S110, the detection data (vehicle speed, brake operation state, yaw rate) of each sensor 11-13 is acquired from the engine ECU 2 and the ESC ECU 3 via the in-vehicle LAN 10, and from the navigation device 4. Get road data (road type).

  In the subsequent S120, it is determined whether or not the vehicle is stopped based on the data representing the vehicle speed and the brake operation state acquired in S110. If an affirmative determination is made, the process proceeds to S140, and if a negative determination is made, the process proceeds to S130. Proceed to

  In S130, based on the data representing the yaw rate acquired in S110, it is determined whether or not the rotation angle of the vehicle is within a preset threshold. If the determination is affirmative, the vehicle is considered to be traveling straight. If the determination is negative and the determination is negative, it is determined that the vehicle is traveling on a curved road and the process proceeds to S145.

  In S140 that proceeds when the vehicle is considered to be stopped or traveling straight ahead in S120 or S130, it is determined whether or not the processing flag is set to 1. If the determination is affirmative, the process returns to S110. If a negative determination is made, the process proceeds to S150.

  On the other hand, in S145 that proceeds when it is determined that the vehicle is traveling on a curved road in S130, it is determined whether or not the processing flag is set to 0. If the determination is affirmative, the process returns to S110 and negative. If it is determined, the process proceeds to S155.

In S150, the data writing process is started, and the process proceeds to S160. On the other hand, in S155, the data writing process is stopped, and the process proceeds to S165.
In subsequent S120, it is determined whether or not the biological signal data is being written to the signal storage area of the memory 26 (that is, whether or not the data writing process is being performed). If the determination is affirmative, the process proceeds to S130. If a negative determination is made, the process proceeds to S135.

  In S160, the process flag indicating the progress status of the data writing process is set to 1 indicating that data is being written, and the process returns to S110. On the other hand, in S165, the processing flag is set to 0 indicating that data is not being written, and the process returns to S110.

<Sensor position adjustment processing>
Here, the sensor position adjustment process executed by the CPU of the control unit 20 will be described in detail with reference to the flowchart shown in FIG. This process is started when the biological signal detection apparatus 1 is turned on, and is executed in parallel with the previous biological signal measurement process until the power is turned off. This process is performed to adjust the installation positions of the electrocardiographic sensor 21a and the pulse wave sensor 21b in the steering 30. In order to avoid duplication of explanation and make it easy to understand, the electrocardiographic sensor 21a is representatively used. It will be handled.

  First, when this process is started, in S210, in order to move the sensor position to the initial position stored in the memory 26, a signal (hereinafter referred to as a positive / negative pulse number corresponding to the moving distance of the electrode unit 40). A pulse signal) is output to the first drive motor 23a. Note that the initial position is stored in the memory 26 by a manual adjustment process described later. Further, the sensor position after the movement here is stored in the memory 26 by the sensor position calculation process.

  In subsequent S220, based on the setting data stored in the memory 26, it is determined whether or not the setting related to the adjustment mode (mode setting) is set to the manual mode for manually adjusting the sensor position. When it judges, it progresses to S230, and when it judges negative, it progresses to S240. As the adjustment mode, in addition to the manual mode, an automatic mode for automatically adjusting the sensor position can be set, and either one of these is preset by the driver via the operation input unit 25. The

In S230, the driver himself performs a manual adjustment process for manually adjusting the sensor position via the operation input unit 25, and returns to S220.
On the other hand, in S240, the detection data (vehicle speed, brake operation state, yaw rate) of each sensor 11-13 is acquired from the engine ECU 2 and ESC ECU 3 via the in-vehicle LAN 10, and the road data (road type) is acquired from the navigation device 4. And these data are memorize | stored in RAM as situation data showing the driving | running | working condition of a vehicle.

  In subsequent S250, the situation data acquired in S240 and the situation data stored in the RAM in the previous main process are compared to determine whether or not the vehicle driving situation has changed. If the determination is negative, the process returns to S250. Note that the change in the driving situation here includes a case where the ignition switch of the vehicle changes from the OFF state to the ON state.

In S260, an automatic adjustment process for automatically adjusting the sensor position based on a position where the driver grips the steering (hereinafter referred to as a gripping position) is executed, and the process returns to S220.
<Manual adjustment processing>
Next, the manual adjustment process executed in S230 of the previous sensor position adjustment process will be described in detail with reference to the flowchart shown in FIG.

  First, when this processing is started, in S310, whether or not an operation command for moving the electrocardiographic sensor 21a up and down is input via the operation input unit 25 (for example, whether or not a switch is pressed). If the determination is affirmative, the process proceeds to S320. If the determination is negative, the process waits as it is.

  In S320, the sensor position in the steering 30 is adjusted by outputting a pulse signal for moving the sensor position to the first drive motor 23a in accordance with the operation command input in S310. Here, the sensor position after the movement is stored in the memory 26 by the sensor position calculation process.

  In subsequent S330, it is determined whether or not a state in which an operation command is not input from the operation input unit 25 has continued for a preset stop time. If the determination is affirmative, operation by the driver (for example, pressing of a switch) is stopped. If the determination is negative, the process returns to S320.

  In S340, the phase relationship between the electrocardiogram waveform obtained by the data writing process during the stop time in S330 and the reference waveform (here, the reference electrocardiogram waveform) indicated by the waveform data stored in the memory 26. The number is calculated, and it is determined whether or not the correlation coefficient is equal to or greater than a predetermined value (for example, 0.75). If the determination is affirmative, it is considered that both are similar and the process proceeds to S350. If a negative determination is made, the process proceeds to S360.

  The electrocardiographic waveform mainly includes a P wave reflecting the electrical excitation of the atrium, a Q, R, and S wave reflecting the electrical excitation of the ventricle, and a process in which the excited ventricular cardiomyocytes repolarize. The R wave has the highest wave height (potential difference). The reference electrocardiographic waveform means a waveform that serves as an index for determining whether or not an electrocardiographic signal has been properly acquired from the driver, and each of the P, Q, R, S, and T waves (R wave) It is indicated by a general average value such as a wave height or a measured value measured in advance by the driver.

  In S350, the sensor position when determined to be similar in the previous S340 is set as the initial position, the set initial value is stored in the memory 26, and this process is terminated. On the other hand, in S360, the display unit 27 and the audio output unit 28 notify that the sensor position needs to be readjusted, and the process returns to S310 again.

  That is, in this process, as shown in FIG. 7A, when the wave height (for example, the height of the R wave) is significantly different from the time axis, it is considered that the electrocardiographic waveform is not accurately measured. On the other hand, as shown in FIG. 7B, when the wave height (for example, the height of the R wave) is substantially constant with respect to the time axis, it is considered that the electrocardiographic waveform is accurately measured. Yes.

<Automatic adjustment processing>
Next, the automatic adjustment process executed in S260 of the sensor position adjustment process will be described in detail with reference to the flowchart shown in FIG.

  First, when this process is started, in S410, based on the data representing the vehicle speed and the road type acquired in S240 of the previous sensor position adjustment process, the same vehicle speed (a vehicle speed within a certain range is acceptable) and road When it is determined whether or not there is a sensor position (hereinafter referred to as a storage position) associated with the type and stored in the position storage area of the memory 26, the process proceeds to S420 if an affirmative determination is made, and the negative determination is made The process proceeds to S430.

  In S420, the sensor position in the steering 30 is adjusted by outputting a pulse signal for moving the sensor position to the storage position determined to exist in S410 to the first drive motor 23a, and the process proceeds to S450. Here, the sensor position after the movement is stored in the memory 26 by the sensor position calculation process.

On the other hand, in S430, the operator's grip position with respect to the steering wheel 30 is acquired from the pressure sensor 22, and the process proceeds to S440.
In S440, the sensor position in the steering 30 is adjusted by outputting a pulse signal for moving the sensor position to the gripping position acquired in S430 to the first drive motor 23a, and the process proceeds to S450. Note that the sensor position after the movement here is also stored in the memory 26 by the sensor position calculation process.

  In S450, based on the electrocardiogram waveform obtained by the data writing process during the standby time set in advance and the reference electrocardiogram waveform indicated by the waveform data stored in the memory 26, S340 in the previous manual adjustment process. In the same manner as described above, the similarity determination is performed. If an affirmative determination is made, the process proceeds to S470, and if a negative determination is made, the process proceeds to S460.

  In S460, a small number of preset pulse signals are output to the first drive motor 23a, and the process returns to S450 again. By repeating these steps, an electrocardiogram waveform close to the reference electrocardiogram waveform (FIG. 7B). The sensor position in the steering wheel 30 is finely adjusted so as to reach the position where the reference can be obtained. Note that the sensor position after the movement here is also stored in the memory 26 by the sensor position calculation process.

  In S470, the sensor position determined to be similar in the previous S450 is stored in the position storage area of the memory 26 in association with the data representing the vehicle speed and road type acquired in S240 of the previous sensor position adjustment process. This process ends.

  In the above embodiment, the biosensor group 21 is the biometric detection unit, the rim side support unit 31 and the spoke side support unit 32 are support units, the drive unit 23 is drive means, the sensor position adjustment process is control means, and the operation input unit 25. Is the operation input means, the pressure sensor 22 is the contact detection means, the engine ECU 2 and the navigation device 4 are the status acquisition means, S340 and S450 are the determination means, and S130 and S155 are the prohibition means.

<Effect of this embodiment>
As described above, in the biological signal detection device 1 of the present embodiment, the electrocardiographic sensor 21a and the pulse wave sensor 21b are provided on the steering rim and the steering spoke in the steering 30, and the rim side support portion 31 and the spoke side. The support portion 32 is attached so that the installation position can be adjusted within a movable range on the steering wheel 30.

  Therefore, according to the biological signal detection device 1 of the present embodiment, in order to suppress noise as much as possible, even if the biological sensor group 21 has a relatively small shape, the grip position of the steering wheel 30 must be matched to the sensor position. Is mitigated, and as a result, the biological signal can be detected with high accuracy according to the driver.

  Further, in the sensor position adjustment process, if the vehicle is running, the automatic adjustment process for automatically adjusting the sensor position is limited to the case where the running situation changes, and therefore the movement of the sensor position is frequently used. Without this, the person to be measured can be concentrated on driving as much as possible.

  In the sensor position adjustment process, the sensor position (initial position) at the time of power activation is set by the manual adjustment process. Therefore, when the power is turned on again, the sensor position is set to the position manually set by the driver himself last time. It moves automatically and it is possible to start manual adjustment from the position after this movement, thereby reducing the time and labor required for manual readjustment.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is possible to implement in various aspects.

  For example, in the automatic control process of the above embodiment, the sensor position is finely adjusted when the electrocardiogram waveform obtained by the data writing process is not similar to the reference electrocardiogram waveform, but this step may be omitted. Absent. Furthermore, a probability similar to the reference electrocardiogram waveform may be stored for each sensor position in the steering 30, and the sensor position may be moved to a storage position having the highest probability.

  Further, in the biological signal measurement process of the above embodiment, execution of the automatic adjustment process is prohibited when the rotation angle of the vehicle exceeds a preset threshold using the yaw rate sensor, but is not limited thereto, For example, the acceleration sensor in the direction of gravity may be prohibited when the vehicle vibration is large.

  By the way, although each electrode part 40 (40L, 40R) of the said embodiment is comprised as an electrode pair which consists of two electrodes 41 (41L, 41R) and 42 (42L, 42R), respectively, it is limited to this. For example, as shown in FIG. 9, it may be configured by four electrodes 41L, 41R to 44L, 44R, respectively. In this case, it is possible to improve the measurement accuracy of the biological signal by a known noise reduction process. Furthermore, an electrode may be additionally installed on the shift knob or door side.

  In the above embodiment, the electrocardiographic sensor 21a is installed so as to be movable in the circumferential direction of the steering rim, and the pulse wave sensor 21b is installed so as to be movable in the left-right direction of the steering spoke. However, the installation state is limited to this. However, the installation positions of the both may be replaced, or only one of them may be provided. Moreover, these sensors 21a and 21b may have a support mechanism that can move in the height direction with respect to the installation surface.

  Furthermore, in the above-described embodiment, the pressure sensor 22 provided on the steering rim is used to detect the gripping position of the operator with respect to the steering 30. However, the present invention is not limited to this. You may use the indoor camera which images.

  Or you may provide a steering heater and a steering cooler in the installation position of the pressure sensor 22 of the said embodiment. Furthermore, a temperature sensor that detects the temperature of the driver's hand held by the steering wheel 30 may be provided, and temperature control of the steering heater and the steering cooler may be performed according to the detection result of the temperature sensor.

  In the present embodiment, the electrocardiographic waveform is measured using the electrocardiographic sensor 21a provided in the steering 30, but the present invention is not limited to this, and as shown in FIG. You may use the electrode part 60 provided in the surface and the backrest surface, and the pressure-sensitive sensor 70 provided so that a seat belt could be slid. Furthermore, a support mechanism for movably supporting the installation position (electrode position) of the electrode unit 60 is provided in the driver seat, and position adjustment control is performed to automatically adjust the electrode position according to the driver's physique. May be.

The block diagram which shows the outline | summary of the structure of the biological signal detection apparatus to which this invention was applied, and in-vehicle LAN to which a biological signal detection apparatus is connected. Explanatory drawing which shows an example of arrangement | positioning states, such as a biosensor. Schematic for demonstrating the mechanism of a rim | limb side support part. The flowchart which shows the detail of the biometric signal measurement process which CPU performs. The flowchart which shows the detail of the sensor position adjustment process which CPU performs. The flowchart which shows the detail of the manual adjustment process performed by S230 of a sensor position adjustment process. The graph which shows an electrocardiogram waveform and a pulse waveform. The flowchart which shows the detail of the automatic adjustment process performed by S270 of a sensor position adjustment process Schematic which shows the structure of the electrode part 40 in other embodiment. Explanatory drawing which shows an example of the arrangement | positioning state of the biosensor in other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Living body signal detection apparatus, 2 ... Engine ECU, 3 ... ESC ECU, 4 ... Navigation apparatus, 10 ... In-vehicle LAN, 11 ... Vehicle speed sensor, 12 ... Brake depression amount sensor, 13 ... Yaw rate sensor, 14 ... GPS apparatus, 15 ... Map data input device, 20 ... control unit, 21 ... biosensor group, 21a ... electrocardiographic sensor, 21b ... pulse wave sensor, 22 ... pressure sensor, 23 ... drive unit, 23a ... first drive motor, 23b ... second drive Motor, 24 ... Bus controller, 25 ... Operation input section, 26 ... Memory, 27 ... Display section, 28 ... Audio output section, 30 ... Steering, 31 ... Rim side support section, 32 ... Spoke side support section, 40 ... Electrode section 50: Optical elements.

Claims (6)

A biological signal detecting device that is provided in the vehicle,
A biological detection unit for detecting a biological signal representing the cardiac potential or pulse wave of the driver of the vehicle;
A support unit for supporting the living body detection unit movably within the adjustment range;
Drive means for applying a driving force for moving the living body detection unit to the support unit;
Contact detection means for detecting a contact range of the driver within the adjustment range of the vehicle member;
Status acquisition means for acquiring the running status of the vehicle;
Determining means for determining whether the shape of a reference waveform that is a waveform serving as a reference of the cardiac potential or the pulse wave is similar to the shape of the waveform of the biological signal detected by the biological detection unit;
Control means for controlling the drive means and performing automatic adjustment processing for adjusting the installation position of the living body detection unit within the contact range detected by the contact detection means;
With
The living body detection unit is provided on a vehicle member that the driver contacts at least during driving, and is installed so that the installation position can be adjusted within an adjustment range set in advance according to the vehicle member ,
In the automatic adjustment process, the position on the vehicle member specified from the traveling situation acquired by the situation acquisition unit based on the correspondence between the traveling situation set in advance and the position on the vehicle member is The installation position of the living body detection unit,
The biological signal is characterized in that, after the automatic adjustment process, the control means performs a fine adjustment process for matching an installation position of the biological detection unit with a position on the vehicle member when it is determined that the determination means is similar. Detection device. The correspondence relationship is a traveling condition obtained by the status obtaining means, according to claim 1, wherein the determination means is characterized in that the position on the vehicle member when it is judged to be similar is associated Biological signal detection device. Comprising an operation input means for inputting an operation command by the driver;
3. The biological signal according to claim 1, wherein the control unit performs a manual adjustment process of adjusting an installation position of the biological detection unit based on the operation command input by the operation input unit. Detection device. The running situation, the speed of the vehicle, or, a biological signal detecting apparatus according to any one of claims 1 to 3, wherein the vehicle is a road type of traveling. If it exceeds a threshold rotational angle is set in advance of the vehicle, according to any one of claims 1 to 4, characterized in that it comprises a prohibiting means for prohibiting the detection of the biological signal by the biometric detection unit Biological signal detection device. It said vehicle member, the biological signal detection apparatus according to any one of claims 1 to 5, characterized in that a steering wheel.