JP2008197821A - Doze warning device and warning method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a doze warning device and a warning method for it for awaking a driver more surely. <P>SOLUTION: The doze warning device 10 awaking the driver when sleepiness of the driver is detected is provided with on-vehicle devices 15, 16, 17, and 18 relating to a driving attitude and a warning control means 14b making a request for change of the driving attitude to the on-vehicle devices 15, 16, 17 and 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drowsiness warning device for awakening a driver when a driver's drowsiness is detected, and a warning method for a drowsiness warning device.

When a driver's drowsiness is detected, it may be possible to wake up the driver by turning on a warning lamp or blowing a buzzer. In some cases, it may not be effective. Therefore, a dozing warning device has been proposed that performs window opening, seat belt tightening, steering handle / seat vibration, air conditioning control, and the like when a driver's drowsiness is detected (see, for example, Patent Document 1). .)
JP 2005-62911 A

  However, the opening of windows and the control of air conditioning are not effective when the windows of the vehicle are originally open, and cannot be applied to an open car. Moreover, even if the user is temporarily awakened by tightening the seat belt, the person may fall into a dozing state again. In addition, the vibration of the steering wheel / seat is less effective when traveling on an unpaved road surface or when wearing thick clothes. That is, there is a problem that the range of applicability of any of the dozing alarm devices described in Patent Document 1 is narrow.

  In view of the above problems, an object of the present invention is to provide a drowsiness warning device and a warning method for a drowsiness warning device that can wake a driver more reliably.

  In view of the above-described problems, the present invention provides an in-vehicle device (for example, a steering computer 15, a steering device 16, a power seat computer 17, The power seat 18) and warning control means for requesting the on-vehicle device to change the driving posture when the driver's drowsiness is detected.

  According to the present invention, since the body feels uncomfortable by changing the driving posture, unlike a sound or vibration, awakening can be surely promoted regardless of the vehicle environment.

  In one embodiment of the present invention, a seat control unit that requests a change in at least one of a seat seat height or a front-rear position is provided. According to the present invention, the driving posture can be changed depending on the seat seat height or the front-rear position.

  In one embodiment of the present invention, a steering control unit that requests a change in at least one of a telescopic position and a tilt position of the steering is provided.

  According to the present invention, the driving posture can be changed by the telescopic position or the tilt position of the steering. Compared to changing the seat position, the distance between the in-vehicle device and the driver does not change, so the driver does not have to move the body and compare the distance to the in-vehicle device, and operate the vehicle immediately Can do.

  It is possible to provide a drowsiness warning device and a drowsiness warning device warning method that can wake the driver more reliably.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

  The doze warning device 10 according to the present embodiment, when detecting the driver's doze, changes the driving posture or adjusts the room temperature, thereby making the driver feel uncomfortable and urging the driver. Since the driving posture directly affects the driver, unlike a warning sound or vibration, a warning can be reliably issued regardless of the vehicle environment. The driving posture includes not only what is determined by adjusting the driver's seat but also what is determined by adjusting the steering position.

  FIG. 1 shows an example of a block diagram of a dozing alarm device 10 of the present embodiment. The dozing warning device 10 includes a dozing detection device 20 and a warning device 30, and the dozing detection device 20 will be described in the embodiment by requesting the warning device 30 to give a warning to the driver when a dozing or drowsiness is detected. Execute warnings to the driver. In many cases, drowsiness refers to a state in which sleepiness is relatively strong, and sleepiness refers to a state in which sleepiness is relatively weak.

  First, the dozing detection device 20 will be described. The dozing detection device 20 includes a camera 11, an image processing ECU 12, a biological sensor 13, and a driving support ECU (DSS ECU (Electronic Control Unit), hereinafter simply referred to as DSS) 14.

  The camera 11 is arranged, for example, so as to face the driver's face on the steering column. The camera 11 has a photoelectric conversion element such as a CCD (Charge Coupled Device), photoelectrically converts incident light according to its intensity, and outputs a digital image (face) of a predetermined luminance gradation (for example, 256 gradations). Image). The biosensor 13 is a sensor for detecting driver drowsiness, such as an electroencephalograph, a pulse sensor, a body temperature sensor, and a skin potential sensor. The biometric sensor 13 supplements the image processing of the face image to improve the accuracy of dozing detection, or detects dozing alone.

  The image processing ECU 12 and the DSS 14 are a CPU that executes a program, a RAM that serves as a work area for executing the program, a RAM that temporarily stores data, an EEPROM (Electronically Erasable and Programmable Read Only Memory), data An input / output interface as an interface, a communication controller that communicates with other ECUs, a ROM that stores programs, and the like are configured by a microcomputer connected by a bus. When the CPU executes the program, the face orientation detection means 12a, the open / close detection means 12b, the dozing detection means 14a, and the warning control means 14b are realized.

  A brief description will be given of detection of dozing by processing of a face image. FIG. 2 is a diagram illustrating an example of face image processing. The face orientation detection means 12a detects the outline and center line of the face from the sequentially inputted face images, and the open / close detection means 12b sequentially sets a predetermined eyeball tracking region including the nostril position and the eye position. The eye opening / closing in the eyeball tracking area is detected for each face image.

  The face orientation detection means 12a detects the outline of the face in order to determine the approximate position of the face from the face image. For example, the face orientation detection unit 12a uses the fact that the background is stationary with respect to the face image, and the pixel value (luminance) changes for each pixel between the sequentially input face images. Are stored. Then, the difference between pixel values at the same position is counted for a predetermined number of face images, a vertical histogram of the counted values is created, and the peak of the integrated value is taken as the horizontal face contour position.

  The face direction detecting means 12a detects the contour of the face in the vertical direction from the edge information. Based on the edge information, the face parts such as eyebrows, eyelids, nostrils, mouth corners, upper and lower lip borders, and the like are detected. Since the parts of the human face are arranged symmetrically, the face direction detection means 12a detects the center line of the face so that the number of left and right edge information is substantially equal. By tracking the obtained center line, the degree of face orientation indicating the direction in which the driver is facing the face is detected.

  Then, a continuous black region (region surrounded by edge information) estimated as eyebrows from the center line of the obtained face is detected as the left and right objects of the center line, and this is determined as the upper contour. Further, the edge information below the eyebrows and straddling the center line of the face and continuing more than a predetermined amount is regarded as the boundary between the upper and lower lips and determined as the lower contour of the face. In this way, the face contour position is obtained.

  When the face outline is detected, the open / close detection means 12b sets an eye tracking region based on the nostril position. The nostril position is determined by binarizing a slightly longer nostril detection area along the center line of the face, and determining a continuous black pixel area having nostril characteristics (shape, size, two horizontally present) as the nostril position. To do. Then, the open / close detection means 12b uses the statistical data of the relationship between the nostril and the eye position to set a predetermined area as an eyeball tracking area based on the nostril position. Once the eyeball tracking area is set, eye opening / closing is detected from the eye tracking area, and if the state where eye opening / closing is not detected continues, detection is performed again from the contour of the face.

  Then, the open / close detection means 12b detects the open / close of the eye by monitoring the upper eyelid and the lower eyelid of the eyeball tracking area. The open / close detection means 12b detects edge information of the eyeball tracking region, searches for edge information from the top to the bottom in order from the left pixel row of the eyeball tracking region, and if the edge information can be searched, the right-right pixel Do the same search for the column. Therefore, if this search is completed to the right end, the upper pixel position is obtained. Similarly, the pixel position of the lower eyelid is obtained by searching the eyeball tracking area from the bottom upward.

  Note that the position of the upper eyelid may be determined based on whether or not the position of the upper eyelid detected in this way changes greatly while a predetermined number of face images are obtained. This is because the driver in an awake state blinks every predetermined time, but the position of the upper eyelid moves more compared to other eye parts (for example, lower eyelids, eyebrows and eyeglass frames) This is because it is considered that the position of the upper eyelid is accurately detected when the position of the upper eyelid moves greatly.

  The open / close detection means 12b calculates the difference (vertical distance) between the upper and lower eyelid pixel positions in order from the left, and sets the maximum number of pixels as the eye opening. Even when the driver closes his eyes, the eye opening is detected from the upper and lower eyelid positions through the same process.

  Since the DSS 14 receives the eye opening for each face image, the dozing detection means 14a compares the threshold for determining the opening and closing of the eye with the opening of the eye. If the eye is small, it is determined that the eye is closed.

  Then, the dozing detection unit 14a determines that the driver is dozing when the eye-closing time is equal to or longer than the predetermined time Ts. In the process of the driver transitioning from the awake state to the dozing state, the frequency of closing the eyes gradually increases although the predetermined time Ts is not reached, so the number of times the eyes are closed for a predetermined time (for example, 30 seconds) is counted. When the number of closed eyes becomes equal to or greater than a predetermined value, it may be determined that there is a drowsiness or drowsiness.

  The warning device 30 will be described. The warning device 30 includes a steering computer 15 that controls the steering device 16, a power seat computer 17 that drives and controls the power seat 18 in the driver's seat, a buzzer output device 21 that sounds an alarm sound, and a meter ECU 19 that controls a warning lamp 22.

  FIG. 3 shows a schematic view of the steering device 16. The steering device 16 has an electric tilt / telescopic function, and the tilt position and the telescopic position can be varied independently.

  A steering shaft 32 extending from the steering wheel 31 is rotatably held by an upper column 33, a middle column 39, and a lower column 38. The upper column 33 is attached to a fork portion 34 formed at the rear end of the middle column 39 through a tilt hinge pin 34a so as to be tiltable. By swinging the upper column 33 as appropriate using the tilt hinge pin 34a as a fulcrum, The tilt position (angle) of the steering wheel 31 can be adjusted.

  The middle column 39 is inserted into the lower column 38 and is slidable in the axial direction together with the upper column 33. Therefore, the telescopic position (height) of the steering wheel 31 can be adjusted by sliding the middle column 39 with respect to the lower column 38 fixed to the vehicle body side.

  The tilt position of the steering wheel 31 is adjusted by the electric tilt actuator 40. When the electric motor 41 of the electric tilt actuator 40 rotates, the electric tilt actuator 40 expands and contracts, and the upper column 33 swings around the tilt hinge pin 34a.

  The telescopic position of the steering wheel 31 is adjusted by an electric telescopic actuator 35 having the same structure as the electric tilt actuator 40. When the electric motor 36 of the electric telescopic actuator 35 rotates, the electric telescopic actuator 35 expands and contracts, and the middle column 39 slides relative to the lower column 38 with the lower column 38 and the pin 37 which is a connecting portion as a fulcrum.

  Therefore, the tilt position is adjusted by controlling the electric tilt actuator 40, and the telescopic position is adjusted by controlling the electric telescopic actuator 35. Note that the arrow A direction is tilted up, the B direction is tilted down, the C direction is telescopic long, and the D direction is called telescopic short.

  FIG. 4 shows a schematic diagram of the power seat 18. The power seat 18 can control the front-rear position, the reclining angle of the seat back 45, and the seating surface height of the seat bottom 46 (hereinafter collectively referred to as the seat position).

  The front-rear position adjusting mechanism 47 includes a pair of left and right lower rails 47b fixed to the vehicle body floor 47a, and an upper rail 47c assembled to the lower rail 47b so as to be slidable in the front-rear direction, and the seat bottom 46 is fixed to the upper rail 47c. A screw shaft is coaxially disposed on the pair of upper rails 47c, and a seat slide motor 47d and a screw shaft are coupled to the pair of upper rails 47c via a transmission mechanism. On the other hand, a nut that engages with the screw shaft is non-rotatably attached to the lower rail 47b. Accordingly, when the seat slide motor 48d is rotated, the screw shaft is rotated, and the upper rail 47c is also moved in the front-rear direction integrally with the screw shaft.

  The height adjustment mechanism 48 has a structure in which an upper frame 48a and a lower frame 48b are slidably connected to an X-shaped link mechanism 48c, and a pair of link mechanisms 48c in the vehicle width direction within the range of the slide amount. By acting like a panda graph around the pin 48e, the distance between the upper frame 48a and the lower frame 48b, that is, the height can be adjusted. A rotary shaft of a vertical motor 48d is connected to a shaft that connects the pair of link mechanisms 48c to each other via a ball screw. By this ball screw, the rotation of the vertical motor 48d is converted into the raising / lowering operation of the upper frame 48a.

  The reclining mechanism 49 includes a lower arm 49a fixed to a pair of upper rails 47, an upper arm 49b assembled to the lower arm 49a so as to be pivotable in the front-rear direction via a gear box 49c, and a reclining motor 49d fixed to the upper arm 49b. By driving 49d, the upper arm 49b rotates in the front-rear direction with respect to the lower arm 49a, whereby the reclining angle of the seat back 45 can be adjusted.

  Returning to FIG. 1, the meter ECU 19 provides warnings such as vehicle status such as speed and engine speed, half-door, etc. based on various sensor signals, switch signals, and requests from each ECU. Display to the driver or turn on a predetermined lamp to inform the driver. The buzzer output device 21 is a sound source circuit and a speaker for outputting an alarm sound such as a buzzer, and the warning lamp 22 is a lamp or HUD on the instrument panel that is turned on when a driver's sleep is detected. (Head Up Display) such as a floodlight device visually alerts the driver.

  The snooze warning device 10 of this embodiment warns the driver with a warning sound or a warning lamp 22 when a snooze is detected, and controls the steering position or the seat position to make the driver feel uncomfortable directly. Prompt.

  By the way, the vehicle detects obstacles in front of or behind the host vehicle with a millimeter wave radar device, etc., and the distance from the irradiation of the millimeter wave radar to the obstacle is reflected by the obstacle. The distance and the relative velocity with the obstacle can be detected by the change in the frequency of the reflected wave. When an obstacle is detected and the possibility of a collision becomes high, the DSS 14 issues a warning to the driver by sounding an alarm sound by the buzzer output device 21 or lighting the warning lamp 22, and at the same time, performs braking with a relatively small deceleration. Alerts in addition to the vehicle (hereinafter simply referred to as initial warning). When the possibility of a collision further increases and the collision becomes unavoidable, the seat belt is wound up or the vehicle is urgently braked to protect the occupant from the impact.

  If the driver is asleep when there is an obstacle ahead, it will be difficult to deal with the driver immediately if the driver wakes up due to the initial warning. Take it out.

  In the present embodiment, a dozing warning device 10 that gives a driver a sense of incongruity by changing a driving posture and promotes awakening will be described.

[Change of seat position]
FIG. 5 shows a flowchart of a control procedure for awakening the driver based on the seat position when the doze warning device 10 detects doze. The flowchart in FIG. 5 starts when, for example, the dozing warning device 10 is set to ON.

  The dozing detection means 14a compares the eye opening detected for each face image with a predetermined threshold value to determine whether the eye is closed, and based on this, determines whether the dozing is detected (S10). . The dozing detection here is, for example, a relatively light dozing (sleepiness).

  When dozing is not detected (No in S10), the dozing warning device 10 repeats the determination in step S10 each time the eye opening is detected.

  When dozing is detected (Yes in S10), the warning control unit 14b requests the power seat computer 17 to change the seat position (S20).

  The change of the seat position may be any of the front and rear positions (front or rear), the seat height (high or low), or the reclining angle (small inclination or large inclination with respect to the vertical) or a combination thereof. However, when the front-rear position is set to the front or the reclining angle is set to a small inclination angle, it is preferable because the driver can feel a tight feeling.

  Further, for example, at the front and rear positions, the arm for operating the steering wheel 31 extends by changing to the rear side, and the arm for operating the steering wheel 31 is contracted by changing to the front side. Can give a sense of incongruity. Moreover, if it is seat surface height, a viewpoint will become high by changing to a higher position, a viewpoint will become low by changing to a lower position, and a driver | operator can be given a sense of incongruity in any case. In addition, if the angle is a reclining angle, the arm that operates the steering wheel 31 extends by changing the inclination angle to a larger value, and the arm that operates the steering wheel 31 contracts by changing the inclination angle to a smaller value. The driver can feel uncomfortable. When the driver feels uncomfortable due to the change of the seat position, it is considered that the driver operates the switch for adjusting the seat position, and therefore the driver's awakening by the operation can be expected.

  Note that the change of the seat position may be performed alternately or randomly at every predetermined time, instead of changing the front / rear position, the seat surface height, or the reclining angle to any one of them. Accordingly, the seat position is continuously changed, and the driver can be effectively awakened.

  Next, the dozing detection unit 14a determines whether or not the closed eye state is still detected even when the seat position is changed (S30). This closed eye is a closed eye corresponding to sleepiness that is determined to have no effect of changing the seat position. When the closed eye state is not detected (No in S30), it is considered that the driver has been awakened by the change of the seat position, and thus the process is terminated.

  When the closed eye state is detected (Yes in S30), the warning control unit 14b requests the meter ECU 19 to sound an alarm sound by the buzzer output device 21 (S40). Therefore, when the driver does not wake up due to the change of the seat position, the wake-up can be urged by the warning sound.

  As described above, since the driver is directly warned by changing the seat position, the driver can feel a sense of incongruity regardless of surrounding noise and music, and can be awakened.

[Change of steering position]
Next, a control procedure for awakening the driver by the steering position when the dozing warning device 10 detects a dozing will be described with reference to the flowchart of FIG. The flowchart of FIG. 6 starts when, for example, the dozing alarm device 10 is turned on.

  The dozing detection means 14a compares the eye opening detected for each face image with a predetermined threshold value to determine whether the eye is closed, and based on this, determines whether the dozing is detected (S10). . The dozing detection here is, for example, a relatively light dozing (sleepiness).

  When dozing is not detected (No in S10), the dozing warning device 10 repeats the determination in step S10 each time the eye opening is detected.

  When dozing is detected (Yes in S10), the warning control unit 14b requests the steering computer 15 to change the steering position (S21).

  The change in the steering position may be tilt up, tilt down, telesco long, telesco short, or a combination of these, but when changing to at least one of tilt up and telesco long, the driver feels cramped. This is preferable.

  Further, for example, if the tilt up or the tilt down is performed, the relationship between the steering wheel 31 and the operation direction of the arm changes, so that the driver can feel uncomfortable. Further, when telescoping, the arm for operating the steering wheel 31 contracts, so that the driver can feel uncomfortable. Further, when a telescopic short-circuit occurs, the arm for operating the steering wheel 31 is extended, so that the driver can feel uncomfortable. When telescoping, the distance to the brake pedal, etc. remains constant compared to when the seat position is changed to the rear, so the driver can decelerate without adjusting the leg position relative to the brake pedal. Is possible.

  The change of the steering position may be switched alternately or randomly between tilt up and tilt down, telescopic long and telescopic short. As a result, the driver can continuously feel a sense of incongruity and the driver can be effectively awakened.

  Next, the dozing detection unit 14a determines whether or not the closed eye state is still detected even when the steering position is changed (S30). This closed eye state is an eye closed corresponding to drowsiness to the extent that it is determined that there is no effect of changing the steering position. If the closed eye state is not detected (No in S30), it is considered that the driver has awakened due to the change in the steering position, and thus the process is terminated.

  When the closed eye state is detected (Yes in S30), the warning control unit 14b requests the meter ECU 19 to sound an alarm sound by the buzzer output device 21 (S40). Therefore, when the driver does not wake up due to the change of the steering position, the wake-up can be urged by the warning sound.

  As described above, since the driver is directly warned by changing the steering position, the driver feels uncomfortable regardless of the surrounding noise and music, and can be awakened. The seat position and the steering position may be changed in combination.

  The snooze warning device 10 of the present embodiment can directly make the driver feel uncomfortable and promote arousal. The change of the driving posture can be executed without being known to other occupants unlike the alarm sound and the lamp lighting, so that it is possible to prevent the passenger from feeling troublesome.

  In addition, if the driver is awakened after changing the seat position or steering position, if the control is to return these to the original position, there will be a warning when some sleepiness is detected, or there will be a false detection of dozing However, since the driver does not feel so troublesome, it is effective as a warning for a drowsiness that is relatively drowsy. Further, since the steering device 16 and the power seat 18 can be used as warning means as they are, a new device used only for awakening is not necessary, and an increase in cost can be suppressed.

  In the present embodiment, a drowsiness warning device 10 that makes the driver feel uncomfortable by changing the room temperature and promotes awakening will be described.

  FIG. 7 shows an example of a block diagram of the dozing alarm device 10 in the present embodiment. In FIG. 7, the same components as those in FIG. 7 includes a body ECU 24 in which the warning device 30 controls the air conditioner ECU 23 and the window motor 25.

  The air conditioner ECU 23 controls the temperature, the air volume, the air outlet, the compressor capacity, and the like based on the temperature inside and outside the vehicle, the set temperature, the amount of solar radiation, the evaporator temperature, and the like. The body ECU 24 is connected to a window actuator 25 serving as a power source for opening and closing the door window 26. The window actuator 25 opens and closes the door window 26 in the opening direction or the closing direction while the operation switch is being opened and closed. The window actuator 25 detects the position (the upper end of the glass) by the rotation pulse of the window motor, and stops the door window 26 when the door window 26 reaches the top dead center or the bottom dead center.

  FIG. 8 is a flowchart of a control procedure in which the dozing alarm device 10 controls the room temperature to make the driver feel uncomfortable and wake up. The flowchart of FIG. 8 starts when, for example, the dozing alarm device 10 is set to ON.

  The dozing detection means 14a compares the eye opening detected for each face image with a predetermined threshold value to determine whether the eye is closed, and based on this, determines whether the dozing is detected (S10). . The dozing detection here is dozing in the process of shifting from the awake state to the dozing state based on whether or not the number of closed eyes per predetermined time is not less than a predetermined value.

  When dozing is not detected (No in S10), the dozing warning device 10 repeats the determination in step S10 each time the eye opening is detected.

  When dozing is detected (Yes in S10), the warning control unit 14b requests the air conditioner ECU 23 or the body ECU 24 to change the room temperature (S22).

  The change in the room temperature is a change that makes the driver feel uncomfortable, and an air conditioner may be used or the opening / closing of the door window 26 may be used. Since it is preferable to change the room temperature in an uncomfortable direction in order to give a sense of incongruity, the air conditioner ECU 23 controls the room temperature to be higher than the set room temperature in the season when it is easy to feel heat such as early summer or summer. Further, in the season when it is easy to feel cold, such as autumn, early winter, and winter, the air conditioner ECU 23 controls the room temperature to be lower than the set room temperature.

  The body ECU 24 closes the door window 26 when the door window 26 is open in a season when it is easy to feel heat, such as early summer or summer, and closes the door window 26 when it is easy to feel cold, such as autumn, early winter, or winter. If closed, the door window 26 is opened. The opening and closing of the door window 26 can be executed in a shorter time than the room temperature control by the air conditioner, so that the immediate effect is high. It is preferable to control the opening / closing of all door windows 26 that can be opened / closed as well as the driver's seat. In a rainy state, the driver's awakening may be promoted by opening the door window 26 of the driver's seat and rebounding the rain sound or raindrops.

  Next, the dozing detection unit 14a determines whether or not the closed eye state is still detected even when the room temperature is controlled (S30). If the closed eye state is not detected (No in S30), it is considered that the driver has been awakened by the room temperature control, and thus the process ends.

  When the closed eye state is detected (Yes in S30), the warning control unit 14b requests the meter ECU 19 to sound an alarm sound by the buzzer output device 21 (S40). Therefore, when the driver does not wake up due to the control of the room temperature, the wakeup can be promoted by the alarm sound.

  As described above, by changing the room temperature, the driver can feel uncomfortable and can be awakened. In addition, the driver may be awakened by combining the change of the seat position and the steering position and the room temperature control.

  The dozing alert device 10 of the present embodiment can surely wake the driver by making the driver feel uncomfortable.

It is an example of the block diagram of a dozing alarm device. It is a figure which shows the image processing example of a face image. It is an example of the schematic diagram of a steering device. It is an example of the schematic diagram of a power seat. It is a flowchart figure of the control procedure which awakens a driver by a seat position, when a dozing warning device detects dozing. It is a flowchart figure of the control procedure which awakens a driver by a steering position, when a dozing warning device detects dozing. It is an example of the block diagram of a dozing alarm device (Example 2). It is a flowchart figure of the control procedure which a dozing warning device controls room temperature, makes a driver | operator uncomfortable, and promotes awakening.

Explanation of symbols

10 dozing alarm device 12 image processing ECU
13 Biosensor 14 Driving support ECU
14a Dozing detection means 14b Warning control means 15 Steering computer 16 Steering device 17 Power seat computer 18 Power seat 19 Meter ECU
20 dozing detection device 23 air conditioner ECU
24 body ECU
26 Door window 30 Warning device

Claims (4)

In the doze warning device that awakens the driver when the driver's sleepiness is detected,
An in-vehicle device related to the driving posture;
When the driver's sleepiness is detected, warning control means for requesting the on-vehicle device to change the driving posture;
A drowsiness warning device comprising:   The dozing warning device according to claim 1, further comprising a seat control unit that requests a change in at least one of a seat seat height or a front-rear position of the seat.   The doze warning device according to claim 1, further comprising a steering control unit that requests a change of at least one of a telescopic position and a tilt position of the steering. In the warning method of the dozing warning device that wakes up the driver when the driver's sleepiness is detected,
A step in which the drowsiness detection means detects the driver's sleepiness;
When the driver's drowsiness is detected, the warning control means requests the in-vehicle device related to the driving posture to change the driving posture; and
A drowsiness warning device warning method comprising:

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