JP6428376B2 - Information display device - Google Patents

Description

  The present invention relates to an information display device mounted on a vehicle.

  There is known a technique for displaying an image in a scenery seen from a driver's seat through a windshield to assist a driver's driving (see, for example, Patent Document 1). In the vehicle described in Patent Document 1, a virtual preceding vehicle is displayed in a scene that can be seen through the windshield from the viewpoint that the presence of the preceding vehicle to be followed reduces the burden on the driver. This virtual preceding vehicle is always displayed while the driver sets a travel route from the current position to the destination and route guidance is being performed.

JP 2008-37167 A

  By the way, in a situation where there is a vehicle (approaching vehicle) traveling behind the host vehicle at a close distance (for example, a situation where the driver is driving from behind), the driver of the host vehicle will exceed an unnecessary speed. Sometimes. In the vehicle described in Patent Document 1, although the effect of suppressing unnecessary speed excess due to the presence of a virtual preceding vehicle can be expected, the virtual preceding vehicle is displayed even in a situation where no approaching vehicle exists, There was a problem that the driver's field of view was obstructed unnecessarily.

  An object of the present invention is to suppress an unnecessary speed excess in a situation where an approaching vehicle exists while securing a driver's field of view in a situation where no approaching vehicle exists.

  One aspect of the present invention is an information display device mounted on a vehicle, and includes an approach determination unit and a vehicle image display unit. The approach determination unit determines whether there is an approaching vehicle that satisfies the approaching traveling condition indicating that the vehicle is traveling at a close distance behind the vehicle. The vehicle image display unit displays a preceding vehicle image representing a virtual preceding vehicle on the scenery seen through the windshield from the driver's seat on the condition that the approach determining unit determines that an approaching vehicle exists. Execute. According to such a configuration, unnecessary speed excess can be suppressed in a situation where an approaching vehicle exists while securing a driver's field of view in a situation where no approaching vehicle exists.

It is a block diagram which shows the structure of a vehicle. It is a figure showing the driver's seat of a vehicle. It is a flowchart of a speed excess suppression process. It is a flowchart of a low-speed driving | running | working warning process. It is a figure (1) showing a preceding vehicle image. It is a figure showing a displacement image. It is a figure (2) showing a preceding vehicle image. It is a figure (3) showing a preceding vehicle image.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. Further, the reference numerals used in the description of the following embodiments are also used in the claims as appropriate, but this is used for the purpose of facilitating the understanding of the present invention, and limits the technical scope of the present invention. Not intended.

[1. Constitution]
A vehicle 1 shown in FIG. 1 includes a front camera 11, a rear camera 12, a sonar 13, a vehicle speed sensor 14, an in-vehicle camera 15, a steering sensor 16, a speaker 17, a head-up display (hereinafter referred to as “HUD”) 18, and a HUD control device. 19 and a human machine interface control unit (hereinafter referred to as “HCU”) 20.

The front camera 11 images the front of the vehicle 1 and outputs the captured image to the HCU 20 as a front image signal.
The rear camera 12 captures the rear of the vehicle 1 and outputs the captured image to the HCU 20 as a rear image signal.

  The sonar 13 transmits an ultrasonic wave behind the vehicle 1 and receives a reflected wave thereof, and detects a distance to the target reflecting the ultrasonic wave, an orientation of the target with respect to the vehicle 1, and the like. The sonar 13 outputs a sonar signal representing the detection result to the HCU 20.

The vehicle speed sensor 14 detects the traveling speed of the vehicle 1 and outputs a vehicle speed signal representing the detection result to the HCU 20.
The in-vehicle camera 15 images the face of the driver driving the vehicle 1 and outputs the captured image to the HCU 20 as an in-vehicle image signal.

  The steering sensor 16 detects the pressure applied to the steering wheel when the driver grips the steering wheel, and outputs a steering signal representing the detection result to the HCU 20.

The speaker 17 is provided in the passenger compartment of the vehicle 1 and outputs sound to the driver.
The HUD 18 is a device that projects various images on the windshield of the vehicle 1 and displays these images so as to be superimposed on the scenery seen from the driver's seat of the vehicle 1 through the windshield. The HUD 18 includes a liquid crystal panel, a backlight that illuminates and transmits the liquid crystal panel, and a concave mirror that reflects an image generated by the light of the backlight transmitted through the liquid crystal panel toward the windshield. As shown in FIG. 2, the HUD 18 displays an image on a landscape that is an area on the windshield of the vehicle 1 and that is visible through the area 19 a located in front of the driver's seat.

  The HUD control device 19 includes a known microcomputer centered on a CPU, ROM, and RAM, and displays an image on the HUD 18 based on a command from the HCU 20. Further, the HUD control device 19 acquires data representing the forward image signal from the HCU 20, and executes a display optimization process to be described later based on the acquired data.

  The HCU 20 includes a known microcomputer centered on a CPU, a ROM, and a RAM, and executes an overspeed suppression process (FIG. 3) and a low-speed traveling warning process (FIG. 4), which will be described later, based on the acquired various signals. The HCU 20 performs HUD control on an image representing a virtual preceding vehicle (hereinafter referred to as “preceding vehicle image”, see FIG. 5) as an image for suppressing an unnecessary excess speed of the vehicle 1 during the overspeed suppression processing. It is displayed on the device 19. Further, the HCU 20 displays an image (hereinafter referred to as “displacement image”) that changes so as to move away from the front of the vehicle 1 as an image for prompting acceleration of the vehicle 1 in the low-speed traveling warning process on the HUD control device 19. Let In the present embodiment, the displacement image is an image in which the cat overtakes the vehicle 1 (see FIG. 6).

[2. processing]
[2-1. Overspeed suppression processing]
Next, the overspeed suppression process executed by the HCU 20 will be described with reference to the flowchart of FIG. The overspeed suppression process is started when the ignition switch of the vehicle 1 is turned on.

  First, the HCU 20 determines whether or not there is a preceding vehicle in S11 (S represents a step). Here, the HCU 20 determines that there is a preceding vehicle when it is determined that there is a vehicle traveling ahead in the same traveling lane of the vehicle 1 based on the front image signal. On the other hand, if not, the HCU 20 determines that there is no preceding vehicle. Whether or not the vehicle ahead of the vehicle 1 is traveling in the same traveling lane is determined by recognizing a white line based on the front image signal. When the HCU 20 determines that a preceding vehicle exists (S11: YES), the HCU 20 executes the process of S11 again.

  On the other hand, when it is determined that there is no preceding vehicle (S11: NO), the HCU 20 determines whether there is a vehicle (approaching vehicle) that satisfies the approach traveling condition (S12). The approaching traveling condition referred to here is a condition representing traveling behind the vehicle 1 at a close distance. In the present embodiment, the state where the vehicle 1 is traveling behind the vehicle 1 within the first determination reference distance (for example, 20 [m]) in the same travel lane continues for the determination reference time (for example, 20 seconds) or more. Is the approaching traveling condition. Here, the HCU 20 recognizes the presence of the vehicle behind the vehicle 1 based on the rear image signal, and determines the distance from the recognized vehicle based on the rear image signal and the sonar signal. Whether the vehicle behind the vehicle 1 is traveling in the same traveling lane may be determined by recognizing a white line based on the rear image signal, and based on the direction of the vehicle with respect to the vehicle 1 represented by the sonar signal. It may be determined. If the HCU 20 determines that there is no approaching vehicle (S12: NO), the HCU 20 returns to the above-described S11 and repeats the processes after S11.

On the other hand, when it is determined that an approaching vehicle exists (S12: YES), the HCU 20 determines whether or not the driver is in a tensioned state (tensed state) (S13). Here, the HCU 20 is in a tension state when both of the following conditions (1) and (2) are satisfied and at least one of the conditions (a) to (c) is satisfied. If not, it is determined that the driver is not in a tension state.
(1) The average traveling speed of the vehicle 1 has increased by a predetermined value or more from the time when it is determined in S12 that an approaching vehicle exists.

This condition is a condition in consideration of the fact that the driver tends to increase the traveling speed of the vehicle 1 when the driver is in tension due to the presence of an approaching vehicle. The HCU 20 satisfies the condition (1) based on the vehicle speed signal. It is determined whether or not is established. Specifically, the HCU 20 determines whether or not the condition (1) is satisfied as follows. That is, the HCU 20 calculates the average traveling speed every time the vehicle 1 travels 1 [km]. The HCU 20 compares the calculated average traveling speed with the latest average traveling speed before the determination every time the average traveling speed is calculated from the time when it is determined in S12 that an approaching vehicle exists. It is determined whether or not the traveling speed has increased by a predetermined value (for example, 20 [km / h]) or more.
(2) The first determination reference speed Th1 [km / h] in which the traveling speed of the vehicle 1 is set to be greater than 0 [km / h] and is equal to or lower than the speed limit of the road on which the vehicle 1 is traveling. h].

This condition is a condition in consideration that the driver does not tend to drive the vehicle 1 at an excessively low speed compared to the speed limit when the driver is in tension due to the presence of an approaching vehicle. Based on the above, it is determined whether or not the condition (2) is satisfied. In the present embodiment, the first determination reference speed Th1 [km / h] is a speed that is 10 [km / h] slower than the speed limit (when the speed limit is v [km / h], Th1 = v−10) ) And when the traveling speed of the vehicle 1 is equal to or lower than the first determination reference speed Th1 [km / h], it is determined that the vehicle speed is excessively low. Thus, in the present embodiment, the first determination reference speed Th1 [km / h] varies according to the speed limit of the road on which the vehicle 1 is traveling. Further, since the first determination reference speed Th1 [km / h] is set to be larger than 0 [km / h], if the vehicle 1 is not traveling, the condition (2) is not satisfied, and as a result, The image (preceding vehicle image) displayed in this process is not displayed. For this reason, the preceding vehicle image is not displayed in a situation in which an approaching vehicle exists when the vehicle 1 is not traveling (that is, when the traveling speed is 0 [km / h]) such as waiting for a signal. The condition (2) is also a condition for preventing the preceding vehicle image displayed in the present process and the displacement image displayed in the low-speed traveling warning process (the process of FIG. 4) described later from being displayed simultaneously. .
(A) The driver confirms the rearview mirror a predetermined number of times (for example, three times) within a predetermined time (for example, 10 seconds).

This condition is a condition that the number of times the driver's rearview mirror is confirmed, and the HCU 20 determines whether or not the condition (a) is satisfied by detecting the driver's line of sight based on the in-vehicle image signal.
(B) The similarity between the driver's facial expression and the expression during tension is high.

The HCU 20 determines whether or not the condition (b) is satisfied by detecting the facial expression of the driver based on the in-vehicle image signal and comparing the detected facial expression with a pre-stored facial expression during tension.
(C) The pressure applied to the steering wheel is greater than or equal to a predetermined value.

  This condition is a condition that the force with which the driver grips the steering wheel is strong, and the HCU 20 determines whether or not the condition (c) is satisfied based on the steering signal.

The HCU 20 determines whether or not the driver is in a tension state based on the above conditions (1), (2), and (a) to (c).
When the HCU 20 determines that the driver is not in a tension state (S13: NO), the HCU 20 returns to S11 described above, and repeats the processes after S11. On the other hand, when the HCU 20 determines that the driver is in a tension state (S13: YES), the HCU 20 proceeds to S14. That is, the HCU 20 executes the processes after S14 only when there is no preceding vehicle, there is an approaching vehicle, and the driver is in a tension state.

  In S14, the HCU 20 causes the HUD control device 19 to perform display optimization processing (S14). The display optimization process here is a process for displaying an image that the driver recognizes that the vehicle is actually traveling in front of the vehicle 1, and specifically, based on the front image signal. This is a process of calculating the size and position of the preceding vehicle image to be displayed by the HUD 18. For example, the HUD control device 19 recognizes the white line ahead of the vehicle 1 and calculates the size of the preceding vehicle image that does not protrude from the recognized white line. Further, when the recognized white line is curved, the HUD control device 19 calculates the position of the preceding vehicle image that appears to travel along the white line.

  Next, the HCU 20 causes the HUD control device 19 to display the preceding vehicle image for a predetermined time (for example, 10 seconds), and causes the speaker 17 to output sound (S15). In the present embodiment, the HCU 20 displays a police car image as a preceding vehicle image as shown in FIG. The HCU 20 also displays a character image (a character image “continue”) that prompts the user to follow the police car along with the police car image. In addition, when the traveling speed of the vehicle 1 does not exceed the speed limit of the road, the HCU 20 causes the speaker 17 to output a voice that gives the driver a sense of security (for example, a voice saying “Safe driving”). After executing the process of S15, the HCU 20 returns to S11 described above and repeats the processes after S11.

[2-2. Low-speed driving warning process]
Next, the low-speed traveling warning process executed by the HCU 20 will be described with reference to the flowchart of FIG. Note that the low-speed traveling warning process is started when the ignition switch of the vehicle 1 is turned on.

  First, the HCU 20 determines whether there is a preceding vehicle based on the forward image signal (S21). When the HCU 20 determines that a preceding vehicle exists (S21: YES), the HCU 20 executes the process of S21 again.

  On the other hand, when the HCU 20 determines that there is no preceding vehicle (S21: NO), the HCU 20 determines whether there is a vehicle (following vehicle) that satisfies the rearward traveling condition based on the rear image signal and the sonar signal ( S22). The backward running condition here is a condition indicating that the vehicle 1 is running behind the vehicle 1. The rear running condition is different from the approach running condition described above in that the criterion of the judgment reference distance is different, and the judgment reference distance (second judgment reference distance) of the rear running condition is set longer than the first judgment reference distance. The In the present embodiment, the state where the vehicle 1 is traveling behind the vehicle 1 within the second determination reference distance (for example, 100 [m]) in the same traveling lane continues for the determination reference time (for example, 20 seconds) or more. It is assumed that the vehicle is traveling backward. The HCU 20 determines that there is a subsequent vehicle when it is determined that there is a vehicle that satisfies the rearward traveling condition, and determines that there is no subsequent vehicle otherwise. When the HCU 20 determines that there is no subsequent vehicle (S22: NO), the HCU 20 returns to S21 described above and repeats the processes after S21.

  On the other hand, if the HCU 20 determines that the following vehicle is present (S22: YES), the traveling speed of the vehicle 1 is greater than 0 [km / h] based on the vehicle speed signal, and the second determination reference speed. It is determined whether it is less than Th2 [km / h] (S23). Specifically, the HCU 20 first determines whether the traveling speed of the vehicle 1 is equal to or lower than the second determination reference speed Th2 [km / h] (first determination). Then, when an affirmative determination is obtained in the first determination, the HCU 20 determines whether the traveling speed of the vehicle 1 is greater than 0 [km / h] (second determination). If the affirmative determination is also obtained in the second determination, the HCU 20 has the traveling speed of the vehicle 1 higher than 0 [km / h] and equal to or lower than the second determination reference speed Th2 [km / h]. Is determined. On the other hand, if the HCU 20 makes a negative determination in either the first determination or the second determination, the traveling speed of the vehicle 1 is greater than 0 [km / h] and the second determination Does not fall under the reference speed Th2 [km / h] or less (that is, the traveling speed of the vehicle 1 is 0 [km / h] or is larger than the second determination reference speed Th2 [km / h]) ). Further, in the present embodiment, the second determination reference speed Th2 [km / h] is the first determination reference speed Th1 [km] in the tension state determination (determination in S13 of FIG. 3) in the above-described overspeed suppression process. / H] is set to the same speed. Therefore, in the present embodiment, the determination in S23 determines whether or not the vehicle 1 is traveling at an excessively low speed compared to the speed limit.

  The HCU 20 has a traveling speed of the vehicle 1 of 0 [km / h] or greater than the second determination reference speed Th2 [km / h] (that is, the vehicle 1 is not traveling or travels). If it is determined that the vehicle is not traveling at an excessively low speed (S23: NO), the process returns to S21 described above, and the processes after S21 are repeated. On the other hand, the HCU 20 has a traveling speed of the vehicle 1 higher than 0 [km / h] and equal to or lower than a second determination reference speed Th2 [km / h] (that is, the vehicle 1 travels at an excessively low speed). (S23: YES), the process proceeds to S24. That is, the HCU 20 executes the processes after S24 only when there is no preceding vehicle, there is a following vehicle, and the vehicle 1 is traveling at an excessively low speed. When the traveling speed of the vehicle 1 is 0 [km / h] (that is, the vehicle 1 is not traveling), a negative determination is obtained in S23, and the processing after S24 is not executed. Images (displacement images) are not displayed. For this reason, the displacement image is not displayed in a situation where there is a following vehicle when the vehicle 1 is not traveling (that is, when the traveling speed is 0 [km / h]) such as waiting for a signal.

  In S24, the HCU 20 causes the HUD control device 19 to execute the display optimization process similar to S14 in the overspeed suppression process (FIG. 3). Then, the HCU 20 causes the HUD control device 19 to display the displacement image for a predetermined time (for example, 10 seconds), and causes the speaker 17 to output sound (S25). In the present embodiment, as shown in FIG. 6, the HCU 20 displays an image such that a cat overtakes the vehicle 1 and moves away from the vehicle 1 as a displacement image. In addition, the HCU 20 causes the speaker 17 to output a sound that prompts the driver to accelerate the vehicle 1 (for example, a sound “traveling speed is slow”). After executing the processing of S25, the HCU 20 returns to S21 described above and repeats the processing after S21.

[3. effect]
According to the embodiment detailed above, the following effects can be obtained.
(1a) In the present embodiment, the HCU 20 determines whether or not an approaching vehicle is present in the overspeed suppression process, and if it is determined that an approaching vehicle is present, the preceding vehicle image is sent to the HUD control device 19. Display. That is, the preceding vehicle image is not displayed in a situation where no approaching vehicle exists. Further, in a situation where there is an approaching vehicle, an increase in the speed of the vehicle 1 is hindered by the presence of the preceding vehicle image. Therefore, in this embodiment, unnecessary speed excess can be suppressed in a situation where an approaching vehicle is present while securing a driver's field of view in a situation where no approaching vehicle exists. In addition, it is possible to give the driver a psychological reassurance by making the driver think that traveling at the current traveling speed is based on the preceding vehicle image (that is, he is not responsible).

  (1b) In this embodiment, the HCU 20 determines whether or not the driver is in a tension state in the overspeed suppression process, and HUD controls the preceding vehicle image on the condition that the driver is determined to be in a tension state. It is displayed on the device 19. Therefore, it is possible to prevent the driver's field of view from being unnecessarily blocked in the following cases. That is, even if an approaching vehicle is present, the driver maintains a normal mental state without displaying the preceding vehicle image, and sometimes does not exceed the speed. If the preceding vehicle image is displayed in such a case, the driver's field of view is unnecessarily blocked. Therefore, by adding the condition that the driver is in tension as in the present embodiment, there is an approaching vehicle, but the preceding vehicle image is displayed when the driver is not in tension (that is, there is a tendency not to exceed the speed). It can be suppressed that the driver's field of view is unnecessarily obstructed.

  (1c) In this embodiment, the HCU 20 displays a police car image as the preceding vehicle image. Since the police car normally travels at a traveling speed equal to or less than the speed limit, the vehicle 1 follows the police car, so that the driver is limited in speed compared to the case where the preceding vehicle image is an image of a vehicle other than the police car. The driving inside can be further encouraged. Further, in the vicinity of the police car, the driver tends to comply with the traffic rules, so that it is possible to further suppress unnecessary speed excess compared to the case where the preceding vehicle image is a vehicle other than the police car.

  (1d) In the present embodiment, the HCU 20 determines whether or not there is a following vehicle in the low-speed traveling warning process, and determines whether or not the traveling speed of the vehicle 1 is equal to or lower than the second determination reference speed. . Then, the HCU 20 is a displacement image that is an image for accelerating acceleration on the condition that it is determined that the following vehicle is present and that the traveling speed of the vehicle 1 is equal to or lower than the second determination reference speed. Is displayed on the HUD control device 19. Accordingly, when there is a subsequent vehicle behind the vehicle 1 and the vehicle 1 is traveling at a low speed, the driver can be prompted to accelerate, and consequently, the subsequent vehicle can be prevented from being disturbed by the low-speed traveling. it can. In addition, the displacement image is an image that changes so as to move away from the front of the vehicle 1, but the driver routinely views the scenery where an object (specifically, another vehicle) passes the vehicle 1 and moves away from the vehicle 1. It is a sight to see. Therefore, in the present embodiment, acceleration is urged by the scenery that the driver sees on a daily basis. Therefore, acceleration is performed without further diverting the driver's attention compared to, for example, prompting acceleration by displaying a text message by the HUD 18. Can be encouraged.

  (1e) In the present embodiment, the size and position of an image to be displayed are calculated based on an image captured by the front camera 11. Since the road situation is acquired on the spot by the front camera 11, the preceding vehicle image and the displacement image having a shape suitable for the road shape ahead of the vehicle 1 can be obtained without the road situation information stored in the car navigation device or the like. Can be displayed.

[4. Contrast with terms in claims]
In the present embodiment, the HCU 20 corresponds to an example of an information display device, S12 corresponds to an example of processing as an approach determination unit, S13 corresponds to an example of processing as a tension determination unit, and S15 corresponds to a vehicle image display unit. And S22 corresponds to an example of a process as a subsequent determination unit. Further, S23 corresponds to an example of processing as a speed determination unit, and S25 corresponds to an example of processing as a displacement image display unit.

[5. Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention can take a various form, without being limited to the said embodiment.

  (5a) In the above embodiment, the HCU 20 displays a police car image or a cat image as the preceding vehicle image and the displacement image, but the present invention is not limited to this. For example, the HCU 20 may be able to display a large vehicle as the preceding vehicle image. As the large vehicle, for example, a truck shown in FIG. 7 or a trailer (not shown) may be displayed. When a large vehicle such as a truck is displayed, the driver can recognize that he / she cannot pass even if he / she wants to pass, and as a result, he / she can feel that he / she cannot help even if the speed of the vehicle 1 cannot be increased. As a result, it is possible to avoid an unnecessary speed excess by the driver. Further, the HCU 20 may be able to display vehicles other than the above-described police cars and large vehicles.

  Moreover, HCU20 may be able to display the vehicle deform | transformed as shown in FIG. 8, for example as a preceding vehicle image. When a deformed vehicle is displayed, the driver visually recognizes the vehicle, which is more relaxed and less relaxed than when a real vehicle is displayed. The burden can be further reduced. Further, the HCU 20 may be able to display, for example, an anthropomorphic vehicle as the deformed vehicle.

  The HCU 20 may display, for example, an image of a rabbit or a turtle as a displacement image. Further, the HCU 20 may be capable of displaying a character as a displacement image. The character here means an object that the driver does not actually see while driving, and examples include characters of anime and manga, deformed animals, and the like. By displaying characters that match the driver's taste and characters that are caressed, the effect of relieving the driver's tension can be expected.

  Note that not only the image displayed as the displacement image but also the image displayed as the preceding vehicle image may be selectable in accordance with the driver's preference or the like. In any example, it may be notified that the running speed of the vehicle 1 is not legally problematic by visual means such as the HUD 18 or an indicator, or auditory means such as the speaker 17.

  (5b) The approaching traveling condition and the backward traveling condition are not limited to those in the above embodiment. Moreover, in the said embodiment, although the conditions of determination about the driver | operator's tension | tensile_strength were high similarity with a driver's facial expression and the facial expression at the time of tension, it is not restricted to this. The determination condition may be, for example, a condition based on the driver's sweat amount (for example, a condition that the driver's sweat amount is a predetermined amount or more). Further, the determination condition may be a condition based on how the driver holds the steering wheel. In this case, for example, when the condition that the driver has the steering wheel with one hand is satisfied, it may be determined that the driver is not in a tension state. In the above embodiment, in the determination of the degree of tension, a specific condition (the above conditions (1) and (2)) is a necessary condition for the driver to be in a tension state (in other words, an AND condition). For example, all conditions may be OR conditions.

  (5c) In the above embodiment, the necessary condition for displaying the preceding vehicle image is that an approaching vehicle exists and the driver is in a tension state, but is not limited thereto. For example, only the presence of an approaching vehicle may be a necessary condition. That is, it is not necessary for the driver to be in tension. Similarly, the necessary condition for displaying the displacement image is not limited to that of the above embodiment.

  (5d) In the above embodiment, the first determination reference speed Th1 [km / h] and the second determination reference speed Th2 [km / h] are set to the same speed. May be set. In this case, in order not to display the preceding vehicle image and the displacement image at the same time as in the above embodiment, the second determination reference speed Th2 [km / h] is greater than the first determination reference speed Th1 [km / h]. May be set lower. Moreover, in the said embodiment, although the preceding vehicle image and the displacement image were not displayed simultaneously, it is not restricted to this, You may display simultaneously. Moreover, in the said embodiment, although HCU20 performed both the overspeed suppression process and the low speed driving | running | working warning process, it is not restricted to this, You may perform only an overspeed suppression process.

  (5e) In the above embodiment, the HCU 20 acquires the situation behind the vehicle 1 from the rear camera 12 and the sonar 13, and determines whether there is an approaching vehicle and a following vehicle based on the acquired situation. Not limited. For example, the HCU 20 may acquire the situation behind the vehicle 1 from a laser device or the like and execute the determination.

  (5f) In the above embodiment, the HCU 20 acquires the driver's state from the front camera 11, and makes a determination on the driver's tension state based on the acquired state, but is not limited thereto. For example, the HCU 20 may perform the above determination by acquiring the driver's state using an electrocardiographic sensor installed in the driver's seat.

  (5g) The functions of one constituent element in the above embodiment may be distributed as a plurality of constituent elements, or the functions of a plurality of constituent elements may be integrated into one constituent element. Further, at least a part of the configuration of the above embodiment may be replaced with a known configuration having the same function. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified only by the wording described in the claim are embodiment of this invention.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 11 ... Front camera, 12 ... Rear camera, 13 ... Sonar, 14 ... Vehicle speed sensor, 15 ... In-vehicle camera, 16 ... Steering sensor, 17 ... Speaker, 18 ... HUD, 19 ... HUD control device, 19a ... Area 20 ... HCU.

Claims (6)

An information display device (20) mounted on a vehicle,
An approach determination unit (S12) for determining whether or not there is an approaching vehicle that satisfies the approaching traveling condition indicating that the vehicle is traveling at a close distance behind the vehicle;
A tension determination unit (S13) for determining a tension state of a driver driving the vehicle;
If the approach determination unit determines that the approaching vehicle exists , and the tension determination unit determines that the driver is in a tensioned state, the front of the driver's seat of the vehicle A vehicle image display unit (S15) that executes a process of displaying a preceding vehicle image representing a virtual preceding vehicle in a landscape that can be seen through the glass;
An information display device comprising: The information display device according to claim 1 ,
A subsequent determination unit (S22) for determining whether or not there is a subsequent vehicle that satisfies a rearward traveling condition indicating that the vehicle is traveling behind the vehicle;
A speed determination unit (S23) for determining whether or not the traveling speed of the vehicle is equal to or lower than a predetermined determination reference speed set to be equal to or lower than a speed limit of a road on which the vehicle is traveling;
The vehicle on condition that the subsequent determination unit determines that there is a vehicle following the vehicle and the speed determination unit determines that the traveling speed of the vehicle is equal to or lower than the determination reference speed. A displacement image display unit (S25) that executes a process of displaying a displacement image that changes so as to move further forward in the scene,
An information display device further comprising: An information display device (20) mounted on a vehicle,
An approach determination unit (S12) for determining whether or not there is an approaching vehicle that satisfies the approaching traveling condition indicating that the vehicle is traveling at a close distance behind the vehicle;
On the condition that the approaching vehicle has determined that the approaching vehicle is present, a process of displaying a preceding vehicle image representing a virtual preceding vehicle on the scenery seen through the windshield from the driver's seat of the vehicle is executed. A vehicle image display unit (S15);
A subsequent determination unit (S22) for determining whether or not there is a subsequent vehicle that satisfies a rearward traveling condition indicating that the vehicle is traveling behind the vehicle;
A speed determination unit (S23) for determining whether or not the traveling speed of the vehicle is equal to or lower than a predetermined determination reference speed set to be equal to or lower than a speed limit of a road on which the vehicle is traveling;
The vehicle on condition that the subsequent determination unit determines that there is a vehicle following the vehicle and the speed determination unit determines that the traveling speed of the vehicle is equal to or lower than the determination reference speed. A displacement image display unit (S25) that executes a process of displaying a displacement image that changes so as to move further forward in the scene,
An information display device comprising: An information display device according to any one of claims 1 to 3 , wherein
The vehicle image display unit is an information display device capable of displaying a police car as the virtual preceding vehicle. An information display device according to any one of claims 1 to 4 , wherein
The vehicle image display unit is an information display device capable of displaying a large vehicle as the virtual preceding vehicle. An information display device according to any one of claims 1 to 5 , wherein
The vehicle image display unit is an information display device capable of displaying a vehicle deformed as the virtual preceding vehicle.