JP7322745B2 - Driving support device - Google Patents

Description

The present invention relates to a driving assistance device.

From the viewpoint of safety, some vehicles issue an alarm when they detect that the driver is asleep to call the attention of the driver. For example, when an image of the driver is captured and the eyes are closed for a predetermined time or longer, it is detected that the driver is dozing off.

JP 2019-113925 A

However, there are individual differences in the eyes of each driver, and the movement of the eyes may also differ depending on the driving situation. Since it is difficult to detect a dozing state with high accuracy in this way, there is a risk that a false alarm will be issued even in cases where an alarm is not actually necessary.

Accordingly, the present invention has been made in view of these points, and an object of the present invention is to suppress issuance of false alarms.

In one aspect of the present invention, a state determination unit that determines whether or not the driver of the vehicle is in a dozing state, and if the state determination unit determines that the driver is in the dozing state, the alarm unit issues an alarm. and a condition determination unit that determines whether or not any one of a plurality of suppression conditions for suppressing the issuance of the alarm is satisfied, and the alarm control unit determines whether the one suppression condition is satisfied. Provided is a driving support device that suppresses the issuance of the warning when it is determined that the above conditions are satisfied.

Further, the alarm control unit may stop the alarm when it is determined that the one suppression condition is satisfied.

Further, when it is determined that the one suppression condition is satisfied, the warning control unit may increase a threshold for determining whether or not to issue the warning.

Further, the warning control unit may cancel the suppression of issuing the warning when a cancellation condition corresponding to the suppression condition for suppressing the issuing of the warning is satisfied.

Further, the suppression condition may include a condition corresponding to the travel time of the vehicle, a condition corresponding to the speed of the vehicle, and a condition corresponding to the driving operation of the driver.

ADVANTAGE OF THE INVENTION According to this invention, it is effective in the ability to suppress issuance of a false alarm.

1 is a schematic diagram for explaining the configuration of a driving assistance device 1 according to one embodiment of the present invention; FIG. It is a figure for demonstrating an example of an issuance suppression condition and suppression release conditions. 9 is a flowchart for explaining an example of doze alarm processing;

<Configuration of driving support device>
A configuration of a driving assistance device according to one embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a schematic diagram for explaining the configuration of a driving assistance device 1 according to one embodiment.
The driving assistance device 1 is mounted on a vehicle such as a truck, for example, and assists the driving of the vehicle driver. The driving support device 1 includes a detection device 4, an alarm device 6, and a control device 10, as shown in FIG.

The detection device 4 detects the state of the driver. For example, the detection device 4 captures an image of the driver with a camera, and detects the driver's eye opening degree, face direction, face position, and the like while driving.
Further, the detection device 4 detects the state of the vehicle. For example, the detection device 4 has various sensors for detecting the running time of the vehicle, the vehicle speed, and the driving operation of the driver. The detection device 4 detects, for example, a brake operation (specifically, a brake pedal operation) and a winker operation as the driving operation.

The alarm device 6 is an alarm unit that issues an alarm to the driver. The alarm device 6 issues an alarm to alert the driver, for example, when the driver is asleep. The alarm device 6 may issue a plurality of alarms depending on whether the driver is asleep. For example, the alarm device 6 issues the first alarm in the case of light doze, and the alarm level is higher than the first alarm in the case of advanced doze (severe or aggravated). Issue the second alarm.

The alarm device 6 includes, for example, a speaker that sounds an alarm or the like, a display that displays a warning screen, and a vibration generator that generates vibration. Note that the alarm device 6 may issue an alarm by combining at least two of sound, display, and vibration.

A control device 10 controls the operation of the detection device 4 and the alarm device 6 . The control device 10 causes the alarm device 6 to issue an alarm when it is determined that the driver is dozing off while the vehicle is running.

The control device 10 has a storage unit 20 and a control unit 30, as shown in FIG.
The storage unit 20 includes, for example, ROM (Read Only Memory) and RAM (Random Access Memory). The storage unit 20 stores programs and various data for the control unit 30 to execute. The storage unit 20 also stores information such as a first threshold value and a second threshold value for determining whether to issue an alarm, which will be described later.

The control unit 30 is, for example, a CPU (Central Processing Unit). The control unit 30 executes the program stored in the storage unit 20 to perform dozing alarm processing. The control unit 30 functions as a state determination unit 32, an alarm control unit 34, and a condition determination unit 36, as shown in FIG.

The state determination unit 32 determines whether or not the driver is in a dozing state based on the detection result of the state of the driver by the detection device 4 . If the state of the driver satisfies a predetermined condition (for example, if the state of the driver's eyes is closed for longer than a predetermined time), the driver is in a dozing state. I judge. Moreover, the state determination unit 32 can determine the degree of the dozing state. The state determination section 32 outputs the determination result to the alarm control section 34 .

The alarm controller 34 controls the operation of the alarm device 6 . The alarm control unit 34 causes the alarm device 6 to issue an alarm when the state determination unit 32 determines that the person is in a dozing state (for example, determines that the degree of dozing is equal to or greater than the determination threshold value). For example, the alarm control unit 34 issues a first alarm when the degree of dozing is greater than a first threshold, and issues an alarm level when the degree of dozing is greater than a second threshold (larger than the first threshold). to issue a second alarm with a high

The condition determination unit 36 determines conditions related to control of issuing an alarm from the alarm device 6 . For example, the condition determination unit 36 determines whether or not any one of a plurality of issuance suppression conditions for suppressing the issuance of an alarm is satisfied, based on the vehicle state detection result of the detection device 4 . The condition determination unit 36 outputs to the alarm control unit 34 when one condition for suppressing the issuance is satisfied.

For example, as shown in FIG. 2, the command suppression conditions include a condition corresponding to the running time of the vehicle, a condition corresponding to the vehicle speed, and a condition corresponding to the driving operation of the driver. However, it is not limited to this, and the issuing suppression condition may include conditions from other viewpoints.

FIG. 2 is a diagram for explaining an example of the condition for restraining the command and the condition for canceling the restraint. Here, as shown in FIG. 2, the command suppression conditions are set for operation time, vehicle speed, brake operation, and blinker operation. Regarding the operating time, as an example, when the vehicle speed is less than 5 km/h for 10 minutes or more, the condition for suppressing the issuance is satisfied. As for the vehicle speed, as an example, when the vehicle speed becomes less than 40 km/h during deceleration and 5 seconds later, the issuance suppression condition is satisfied. As for the brake operation, as an example, the issuance suppression condition is satisfied immediately after the start of the operation of the brake pedal. As for the winker operation, as an example, the warning suppression condition is satisfied immediately after the start of the winker operation.

In addition, the condition determination unit 36 determines whether or not the restraint release condition is satisfied from the vehicle state detection result of the detection device 4 . As shown in FIG. 2, the restraint cancellation condition is set corresponding to the command restraint condition. For example, regarding the operation time, as an example, when the vehicle speed is 1 km/h or more for 30 minutes or more, the suppression cancellation condition is satisfied. As for the vehicle speed, the suppression cancellation condition is satisfied 60 seconds after the vehicle speed reaches 60 km/h or more during acceleration. As for the brake operation, the suppression release condition is satisfied when 10 seconds have passed since the brake pedal operation was completed. As for the blinker operation, the restraint cancellation condition is satisfied when 10 seconds have elapsed since the blinker operation was completed.

The alarm control unit 34 suppresses issuing of an alarm or cancels suppression of issuing an alarm based on the determination result of the condition determination unit 36 . The warning control unit 34 suppresses the issuance of the warning when the condition determination unit 36 determines that the one issuance suppression condition is satisfied. For example, the warning control unit 34 stops the warning when it is determined that one warning suppression condition is satisfied. As a result, even if the detection device 4 erroneously detects that the driver is asleep, the warning device 6 does not issue an alarm, thereby suppressing issuance of an erroneous alarm.

Note that the warning control unit 34 may increase the threshold for determining whether to issue an alarm when it is determined that the condition for suppressing the issuing of an alarm is satisfied. For example, when it is determined that the issuance suppression condition is satisfied, the alarm control unit 34 increases the first threshold to make it difficult to issue the first alarm. This can suppress the erroneous issuance of the first alarm. Note that the alarm control unit 34 does not have to increase the value of the second threshold value for the second alarm.

In addition, when the suppression canceling condition corresponding to the condition for suppressing the issuance of the warning is satisfied, the warning control unit 34 cancels the suppression of the issuance of the warning. That is, the alarm control unit 34 cancels the alarm suppression state when the condition determination unit 36 determines that the suppression cancellation condition is satisfied. Therefore, the alarm control unit 34 issues an alarm when the state determination unit 32 determines that the person is dozing. Note that, when the suppression canceling condition is satisfied, the alarm control unit 34 restores the first threshold, which has been increased in value due to the fulfillment of the issuance suppression condition, to the original value.

<Drowsy alarm processing>
The flow of dozing alarm processing will be described with reference to FIG.
FIG. 3 is a flowchart for explaining an example of doze alarm processing. The dozing alarm process shown in FIG. 3 is performed while the vehicle is running.

First, the control device 10 causes the detection device 4 to detect the state of the running vehicle (step S102). For example, the detection device 4 detects the running time of the vehicle, vehicle speed, brake operation, blinker operation, and the like.

Next, the condition determination unit 36 of the control device 10 determines whether or not an issuance suppression condition (see FIG. 2) for suppressing the issuance of an alarm is satisfied from the detection result of the detection device 4 (step S104). For example, when the detection device 4 detects that the winker operation has been performed, the condition determination unit 36 determines that the warning suppression condition is satisfied immediately after the start of the winker operation.

If it is determined in step S104 that the warning suppression condition is satisfied (Yes), the warning control unit 34 increases the determination threshold for issuing a warning (step S106). For example, the alarm control unit 34 increases the first threshold of the first alarm.

After that, the alarm control unit 34 determines whether or not the degree of dozing of the driver determined by the state determination unit 32 is equal to or greater than the determination threshold value (step S108). Specifically, the warning control unit 34 determines whether or not the driver's degree of dozing off is equal to or greater than the determination threshold whose value was decreased in step S106.

If it is determined in step S108 that the degree of dozing is equal to or greater than the determination threshold (Yes), the alarm control unit 34 causes the alarm device 6 to issue an alarm (eg, first alarm) (step S110). The warning device 6 issues a warning to alert the driver who is driving (or to encourage the driver who is dozing off to wake up).

<Effects of this embodiment>
The driving assistance device 1 of the embodiment described above determines whether or not any one of a plurality of warning issuance suppression conditions is satisfied. Then, when it is determined that one issuance suppression condition is satisfied, the driving support device 1 suppresses the issuance of the warning by the warning device 6 .
As a result, even if the detection device 4 erroneously detects that the driver is asleep, the alarm device 6 does not issue an alarm if any one of the plurality of notification suppression conditions is satisfied. Therefore, it is possible to suppress issuance of an erroneous alarm due to erroneous detection of a dozing state while the vehicle is running.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

1 driving support device 4 detection device 6 alarm device 32 state determination unit 34 alarm control unit 36 condition determination unit

Claims (2)

a state determination unit that determines whether the driver of the vehicle is in a dozing state;
an alarm control unit that causes an alarm unit to issue an alarm when the state determination unit determines that the degree of dozing is equal to or greater than a determination threshold value and that the user is in the dozing state;
a condition determination unit that determines whether or not the driver's driving operation satisfies a suppression condition for suppressing issuance of the warning;
with
When it is determined that the suppression condition is satisfied, the warning control unit increases the determination threshold value for whether or not to issue the warning, and suppresses the issuance of the warning.
Driving assistance device. The alarm control unit cancels the suppression of the issuance of the alarm when a cancellation condition corresponding to the suppression condition that suppresses the issuance of the alarm is satisfied.
The driving support device according to claim 1 .

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