WO2019194233A1

WO2019194233A1 - Vehicle-mounted system and display device

Info

Publication number: WO2019194233A1
Application number: PCT/JP2019/014837
Authority: WO
Inventors: 洋一成瀬
Original assignee: 株式会社デンソー
Priority date: 2018-04-04
Filing date: 2019-04-03
Publication date: 2019-10-10
Also published as: JP2019182068A; JP6844575B2

Abstract

This vehicle-mounted system (1) is provided with a detection unit (10), a setting unit (34) and a determination unit (35). The detection unit is configured to detect the brightness at least in front of the vehicle. The setting unit is configured to set the display mode of displayed images. The determination unit is configured to determine whether or not an oncoming vehicle is in a lit state in which the headlights of the oncoming vehicle are lit. If the determination unit determines the lit state, then the setting unit sets the display state without referring to a detected output value, or minimizing the effect of the detected output value on the display state setting.

Description

In-vehicle system and display device

Cross-reference of related applications

This international application claims priority based on Japanese Patent Application No. 2018-72578 filed with the Japan Patent Office on April 4, 2018, and is based on Japanese Patent Application No. 2018-72578. The entire contents are incorporated by reference into this international application.

This disclosure relates to an in-vehicle system that displays an image.

In order to improve the visibility of the image displayed by the display device, a technique for adjusting the display mode such as the luminance of the image according to the surrounding environment is used. In the following Patent Document 1, in a display device mounted on a vehicle, inappropriate brightness due to detection of a brake lamp and a tail lamp of a preceding vehicle by using two optical sensors that detect brightness in different directions. A technique for suppressing the adjustment has been proposed.

JP 2004-314860 A

However, as a result of detailed studies by the inventor, the technique disclosed in Patent Document 1 requires two sensors that face different directions, which complicates the device configuration and restricts the design of the interior of the vehicle. Was found.

One aspect of the present disclosure is to provide a technique for displaying an image in an appropriate display mode without requiring a plurality of optical sensors.

One aspect of the present disclosure is an in-vehicle system that is mounted on a vehicle and configured to display an image forward when viewed from a vehicle occupant, and includes a detection unit, a setting unit, and a determination unit. . The detection unit is configured to detect at least brightness in front of the vehicle. The setting unit is configured to set a display mode of an image to be displayed based on a plurality of output values of the detection unit having different detected timings. The determination unit is configured to determine whether or not it is a lighting state in which a headlamp of an oncoming vehicle that is a vehicle that runs facing the vehicle is lit. The setting unit does not refer to at least one output value detected when the determination unit determines that the lighting state is set, or at least one detected when the setting unit determines that the lighting state is not set. The display mode is set with a smaller influence on the display mode setting than one output value.

According to such a configuration, by recognizing the presence of a vehicle whose headlamp is lit, the display mode of the image is caused by a change in brightness that temporarily changes due to the headlamp of the oncoming vehicle. It can suppress changing. Therefore, it is possible to display an image of an appropriate display mode without requiring a plurality of optical sensors, particularly a sensor for detecting the brightness above the vehicle.

Another aspect of the present disclosure is an in-vehicle system that is mounted on a vehicle and configured to display an image in front of a vehicle occupant, and includes a detection unit, a setting unit, a determination unit, Is provided. The detection unit is configured to detect at least illuminance in front of the vehicle. The setting unit is configured to set a display mode of an image to be displayed based on a plurality of illuminances detected at different timings. The determination unit is configured to determine whether or not a plurality of illuminances exceeds a predetermined threshold. When it is determined that at least one illuminance is greater than or equal to the threshold, the setting unit does not refer to the at least one illuminance, or sets the display mode more than at least one illuminance determined not to be greater than or equal to the threshold. The display mode is set with a small influence.

According to such a configuration, when the illuminance exceeds a predetermined threshold, it is possible to suppress the change in the display mode of the image due to the change in brightness at that time. The situation where the illuminance is too high is likely to be temporary, for example, when the headlight of an oncoming vehicle is lit. Therefore, it is possible to suppress the change in the display mode of the image due to the temporarily changing brightness without requiring a plurality of optical sensors, particularly a sensor for detecting the brightness above the vehicle. .

Yet another aspect of the present disclosure is a display device that is mounted on a vehicle and configured to display an image forward when viewed from a passenger of the vehicle, the acquisition unit, a setting unit, and a determination unit . The acquisition unit is configured to acquire an output value of a detection unit configured to detect at least brightness in front of the vehicle. The setting unit is configured to set a display mode of a displayed image based on a plurality of output values having different detected timings. The determination unit is configured to determine whether or not it is a lighting state in which a headlamp of an oncoming vehicle that is a vehicle that runs facing the vehicle is lit. The setting unit does not refer to at least one output value acquired when the determination unit determines that the lighting state is set, or at least one acquired when it is determined that the lighting state is not set The display mode is set with a smaller influence on the display mode setting than the output value.

According to such a configuration, similarly to the above-described vehicle-mounted system according to one aspect of the present disclosure, a plurality of optical sensors, in particular, a sensor that detects the brightness above the vehicle is not required, and an image with an appropriate display aspect is obtained. Can be displayed.

Note that the reference numerals in parentheses described in this column and in the claims indicate correspondence with specific means described in the embodiments described later as one aspect, and limit the technical scope of the present disclosure. Not what you want.

It is a block diagram which shows the structure of a vehicle-mounted system. It is a side view which shows arrangement | positioning of RLS and an image display part. It is a block diagram which shows the structure of a control part. It is a flowchart of a brightness | luminance setting process. It is a figure explaining the time-dependent change of the illumination intensity outside a vehicle at the normal time, and the sampling method of illumination intensity. It is a figure explaining the time-dependent change of the illumination intensity outside a vehicle when an oncoming vehicle lights a headlamp, and the sampling method of illumination intensity. It is a figure explaining the time-dependent change of the illumination intensity outside a vehicle when an oncoming vehicle lights a headlamp, and the sampling method of illumination intensity. It is a graph which shows the relationship between the illuminance outside the vehicle and the HUD luminance shown in the luminance-illuminance table.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[1. Embodiment]
[1-1. Constitution]
An in-vehicle system 1 shown in FIG. 1 is used by being mounted on a vehicle such as an automobile. Hereinafter, a vehicle on which the in-vehicle system 1 is mounted is described as a host vehicle, and a vehicle other than the host vehicle is described as another vehicle. The in-vehicle system 1 includes a rain light sensor (hereinafter, RLS) 10, an oncoming vehicle detection device 20, and a head-up display (hereinafter, HUD) 30.

The RLS 10 is a sensor that detects the brightness in front of the vehicle 3 as shown in FIG. In the present embodiment, an illuminance sensor is used as the RLS. The RLS 10 can detect brightness and can detect raindrops. Note that a sensor or device other than the illuminance sensor may be used as long as the brightness in front of the vehicle 3 can be detected.

The oncoming vehicle detection device 20 is an inter-vehicle communication device having a communication module (not shown). The oncoming vehicle detection device 20 can execute communication with a device mounted on another vehicle. The oncoming vehicle detection device 20 acquires information such as the position of other vehicles located around the host vehicle, the road on which the vehicle is traveling, the traveling direction, and on / off of the headlamps by inter-vehicle communication. The oncoming vehicle detection device 20 may use another device that can acquire the information of the other vehicle described above. For example, the oncoming vehicle detection device 20 may be road-to-vehicle communication instead of vehicle-to-vehicle communication, or a communication system using a network such as the Internet.

The HUD 30 includes an image display unit 31 and a control unit 32. As shown in FIG. 2, the image display unit 31 emits a light beam based on the image toward the windshield 5 that is a projection target member. The windshield 5 is configured to be positioned in the direction in which the display light is emitted by the image display unit 31. The emitted light beam is reflected by the windshield 5 and travels to the viewpoint of the driver 7 as an example of a passenger. The driver can visually recognize the virtual image 9 in front of the vehicle 3.

The image displayed as the virtual image 9 may include vehicle information and foreground information. The vehicle information is numerical information indicating the traveling state of the vehicle 3, for example. This numerical information includes, for example, information such as vehicle speed, engine speed, and remaining fuel. The foreground information is information that supplements the foreground visually recognized by the driver through the windshield 5. This foreground information includes, for example, information on the position and traveling direction of pedestrians and other vehicles, the route to be traveled, and the like. The member to be projected is not limited to the windshield 5 but may be a known combiner.

The control unit 32 sends a control signal for controlling a light source and a liquid crystal panel (not shown) included in the image display unit 31 to the image display unit 31. As shown in FIG. 3, the control unit 32 includes a microcomputer having a CPU 41 and a semiconductor memory (hereinafter, memory 42) such as a RAM or a ROM. Various functions of the control unit 32 are realized by the CPU 41 executing a program stored in a non-transitional physical recording medium. In this example, the memory 42 corresponds to a non-transitional tangible recording medium that stores a program. Also, by executing this program, a method corresponding to the program is executed. The control unit 32 may include one microcomputer or a plurality of microcomputers.

As shown in FIG. 1, the control unit 32 includes an acquisition unit 33, a setting unit 34, a determination unit 35, and an output unit 36. The method of realizing the functions of the respective units included in the control unit 32 is not limited to software, and some or all of the functions may be realized using one or a plurality of hardware. For example, when the function is realized by an electronic circuit that is hardware, the electronic circuit may be realized by a digital circuit, an analog circuit, or a combination thereof.

The acquisition unit 33 acquires a signal output from the RLS 10. In other words, the acquisition unit 33 acquires the illuminance in front of the vehicle 3 from the RLS 10. This illuminance parameter corresponds to the output value.

The setting unit 34 sets the display mode of the displayed image based on a plurality of illuminances detected at different timings by the RLS 10. In the present embodiment, an average value of a plurality of illuminances sampled at a predetermined cycle within a predetermined period is calculated. The setting unit 34 sets the brightness of the displayed image based on the calculated average illuminance. Note that the determination unit 35 described later determines whether or not the lighting state is present. And about the at least 1 illumination intensity detected when it determines with it being a lighting condition, the setting part 34 gives the setting of a display mode rather than the at least 1 illumination intensity detected when it determines with it not being a lighting condition Reduce the influence and set the display mode. Details of the characteristic processing of the setting unit 34 will be described later. The lighting state is a state in which the headlamp of an oncoming vehicle that is another vehicle that runs opposite to the vehicle 3 is on.

The determination unit 35 is configured to determine whether or not the lighting state is present. This determination is performed with reference to the information on the other vehicle acquired by the oncoming vehicle detection device 20 described above.

The output unit 36 outputs an image to be displayed and information indicating a display mode such as luminance to the image display unit 31. In the image display part 31, the display light which shows the image input by the output part is irradiated so that it may become a set display mode.

[1-2. processing]
Next, luminance setting processing executed by the CPU 41 of the control unit 32 will be described with reference to the flowchart of FIG. This process is started when the HUD 30 is activated.

First, in S1, the CPU 41 acquires the illuminance in front detected by the RLS 10.

In S2, the CPU 41 determines, based on the output from the oncoming vehicle detection device 20, whether there is an oncoming vehicle that irradiates the headlamp toward the host vehicle, that is, whether the lighting state described above is present. To do. If it is determined that the above-described oncoming vehicle exists, the CPU 41 proceeds to S5. On the other hand, if it is determined that the oncoming vehicle does not exist, the CPU 41 proceeds to S3.

In S3, the CPU 41 executes normal illuminance acquisition control. FIG. 5 shows an example of a change with time in the illuminance outside the vehicle. The illuminance outside the vehicle is the illuminance detected by the RLS 10. The sampling frequency is n, and the illuminance is periodically sampled every 1 / n seconds. Note that the sampling timing may be adjusted by the CPU 41 acquiring illuminance at a predetermined cycle, or may be adjusted by the RLS 10 outputting at a predetermined cycle.

In S4, the CPU 41 calculates an average value (hereinafter, average illuminance) of m times of sampling results. In other words, an average value of a plurality of illuminances acquired in a predetermined period in the past from the present time is calculated. The average illuminance can be obtained by employing various average value calculation methods, and for example, an arithmetic average or a weighted average can be used. After S4, the process proceeds to S7.

In S5, the CPU 41 executes control for suppressing the influence of the headlamp in setting the luminance of the image. Specifically, by executing any one of the following (i) to (iv), the influence of the plurality of illuminances acquired in the lighting state on the average illuminance is reduced. In the description of S5, when an oncoming vehicle is detected, it is when it is determined that the lighting state is present.

(I) Illumination Sampling Frequency Reduction FIG. 6 shows an example of a change in illuminance outside the vehicle when an oncoming vehicle is detected at a timing indicated by a broken line. During the period until the oncoming vehicle is detected, the illuminance outside the vehicle is low, and after detecting the oncoming vehicle, the illuminance is temporarily increased by the headlamp of the oncoming vehicle.

The sampling frequency is frequency n until an oncoming vehicle is detected. Here, the illuminance is referred to a times within the predetermined period described above, and the average value of the a samples is calculated as the average illuminance for changing the image luminance.

When an oncoming vehicle is detected, the sampling frequency is changed to frequency m. Here, m <n. At this time, if the number of times that sampling can be performed within a predetermined period is b, b <a. When the predetermined period crosses the timing when the oncoming vehicle is detected, the number of times that sampling can be performed is a number between a and b.

By lowering the sampling frequency in this way, the number of times the detected illuminance is acquired when there is a high possibility of being greatly affected by the headlights of the oncoming vehicle is reduced, and the effect that the illuminance has on the average illuminance is affected. Get smaller.

It should be noted that the predetermined period during which illuminance sampling is performed may be changed before and after detection of an oncoming vehicle. It is sufficient that the frequency after at least the oncoming vehicle is detected is lowered.

(Ii) Increase in the number of reference samples of average illuminance By increasing the number of samplings for calculating the average illuminance than in normal times, the influence of temporary illuminance change is reduced. Specifically, the reference period of the illuminance sample for calculating the average illuminance is set to a long period until the past so that the ratio of the illuminance acquired before detecting the oncoming vehicle is increased. For example, in FIG. 7, until the oncoming vehicle is detected, the average illuminance is calculated with reference to a plurality of illuminances detected in the period c. When the oncoming vehicle is detected, the average illuminance is calculated in the period d longer than the period c. Is calculated.

Since the samples with a plurality of illuminances referenced by increasing the sampling period in this way are increased, the influence of the plurality of illuminances acquired on the average illuminance when receiving a large influence from the headlight is reduced.

Note that the method for increasing the number of samples of the plurality of illuminances to be referred to is not limited to this, and various methods that increase the ratio of the plurality of illuminances acquired before detecting the oncoming vehicle may be used. . For example, the illuminance may be detected at a frequency higher than the frequency n in advance, and the sampling frequency may be increased for the period before the oncoming vehicle is detected without changing the period for referring to the sample. As a result, the influence on the average illuminance of at least one illuminance acquired when not affected by the headlamp is increased, and the influence of at least one illuminance acquired when affected by the headlamp is reduced. Can be small.

(Iii) Exclude from reference sample of average illuminance Among at least one sample having a illuminance equal to or higher than a predetermined threshold among a plurality of illuminance samples acquired during a period in which it is determined that the lighting state is on, the average illuminance is calculated Do not use to do. As a result, it is possible to reduce the influence of at least one illuminance acquired when there is a high possibility of being greatly affected by the headlamp on the average illuminance. Note that all of at least one illuminance sample acquired during the period in which it is determined that the lighting state is on may be excluded from the calculation of the average illuminance.

Note that the method for calculating the average illuminance when the reference sample is excluded is not particularly limited. For example, the average illuminance may be calculated with a sample that is less than the reference sample, or the average illuminance calculated before the oncoming vehicle is detected at the current time (that is, after the oncoming vehicle is detected). The average illuminance may be used as it is.

(Iv) Others For example, at least one illuminance sample acquired during a period in which it is determined that the lighting state is on may determine the average illuminance so that the weight is reduced. In addition to this, it is possible to use various methods such that the influence of at least one illuminance sample acquired during the lighting state is reduced.

In S6, the CPU 41 calculates the average illuminance based on the plurality of illuminances acquired by the sampling method determined in S5. Here, as in S4, various average value calculation methods can be employed.

In S7, the CPU 41 refers to the luminance-illuminance table. The luminance-illuminance table is a table in which HUD luminance with respect to illuminance outside the vehicle is shown. Here, the illuminance outside the vehicle is the average illuminance obtained in S4 or S6. The HUD luminance is the luminance of the image displayed by the image display unit 31. As shown in FIG. 8, the higher the illuminance outside the vehicle, the higher the HUD luminance. By having such a relationship between the illuminance outside the vehicle and the HUD luminance, the brighter the vehicle exterior, the brighter the image is displayed, and the driver can view the image better.

In S8, the CPU 41 changes the luminance of the image displayed by the HUD 30 to the luminance set in S7. Thereafter, the brightness setting process in FIG. 4 is terminated.

[1-3. effect]
According to the embodiment described in detail above, the following effects can be obtained.

(1a) When the in-vehicle system 1 detects a lighting state in which the headlight of an oncoming vehicle is lit, the in-vehicle system 1 sets the brightness of the displayed image by reducing the influence of at least one illuminance acquired at that time To do. Therefore, it is possible to prevent the brightness of the image from being changed due to a temporary environmental change in which the headlight of the oncoming vehicle is received, and the driver from being dazzled. Therefore, an image with appropriate luminance can be displayed without the need for a plurality of optical sensors, particularly a sensor for detecting the brightness above the vehicle.

(1b) Since the in-vehicle system 1 can detect the lighting state by communication such as inter-vehicle communication, it is possible to suppress an increase in the number of sensors necessary for setting the brightness of the image.

[2. Other Embodiments]
As mentioned above, although embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, and can carry out various modifications.

(2a) In the above embodiment, the in-vehicle system 1 has exemplified the configuration in which an image is displayed by a head-up display, but is not limited thereto. For example, the in-vehicle system 1 may be a display device such as a liquid crystal display or an EL display, and may be a display device that is disposed in front of the passenger of the vehicle 3.

(2b) In the above embodiment, the luminance is exemplified as an example of the display mode of the image set according to the average illuminance, but the set display mode may be other than the luminance. Further, the luminance and the display mode other than the luminance may be set at the same time. For example, the color of the image, the size of the image or character, the contrast, etc. may be set according to the average illuminance.

(2c) In the above embodiment, the average illuminance is calculated by reducing the influence of at least one illuminance detected when it is determined that the lighting state is present, but is detected when it is determined that the lighting state is present. The at least one illuminance may not be referred to. By comprising in this way, the influence of the at least 1 illumination intensity acquired when it determines with it being a lighting condition can be reduced more highly.

(2d) In the above embodiment, the configuration for determining whether or not the lighting state is present is exemplified. However, it may be determined whether or not the illuminance detected by the RLS 10 exceeds a predetermined threshold without determining whether or not the lighting state is present. And when setting the display mode of an image according to the result of the determination, you may be comprised so that the process mentioned above, such as reducing the influence of the acquired at least 1 illumination intensity, may be performed.

(2e) In the above embodiment, the configuration in which it is detected that the headlight of the oncoming vehicle is lit by communication processing such as inter-vehicle communication or road-vehicle communication is illustrated. However, it may be detected that the headlight of the oncoming vehicle is lit by a method other than this. For example, a camera that captures the front of the vehicle 3 may be provided as the oncoming vehicle detection device 20, and it may be detected that the headlamps of the oncoming vehicle are lit by performing image processing on a captured image of the camera. Alternatively, it may be determined that the headlamp of the oncoming vehicle is lit when the output value of the RLS 10 is equal to or greater than a predetermined threshold.

(2f) In (iii) of S5 in the above embodiment, the method of calculating the average illuminance without referring to the illuminance exceeding a predetermined threshold when it is determined that the lighting state is present. However, even when the lighting state is not determined, the average illuminance may be calculated without referring to the illuminance greater than or equal to a predetermined threshold.

(2g) In the above embodiment, the RLS 10 has exemplified the configuration for detecting the illuminance in front of the vehicle 3. However, as long as the range includes the front of the vehicle 3, the illuminance may be widely detected other than the front of the vehicle 3.

(2h) A plurality of functions of one constituent element in the above embodiment may be realized by a plurality of constituent elements, or a single function of one constituent element may be realized by a plurality of constituent elements. . Further, a plurality of functions possessed by a plurality of constituent elements may be realized by one constituent element, or one function realized by a plurality of constituent elements may be realized by one constituent element. 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 from the wording described in the claims are embodiments of the present disclosure.

(2i) In addition to the in-vehicle system 1 described above, a non-transitional device such as a display device including a control unit 32 constituting the in-vehicle system 1, a program for causing a computer to function as the control unit 32, a semiconductor memory in which the program is recorded, etc. The present disclosure can also be realized in various forms such as an actual recording medium and a display mode setting method.

Claims

An in-vehicle system (1) mounted on a vehicle and configured to display an image forward as viewed from a passenger of the vehicle,
A detection unit (10) configured to detect at least brightness in front of the vehicle;
A setting unit (34) configured to set a display mode of an image to be displayed based on a plurality of output values of the detection units detected at different timings;
A determination unit (35) configured to determine whether or not a headlight of an oncoming vehicle that is a vehicle that runs opposite to the vehicle is in a lighting state;
The setting unit does not refer to at least one of the output values detected when the determination unit determines that the lighting state is present, or detects when it is determined that the lighting state is not the case. The vehicle-mounted system which sets the said display mode by making the influence which it has on the setting of the said display mode smaller than the said at least 1 said output value.
The in-vehicle system according to claim 1,
The display mode is an in-vehicle system including at least the brightness of an image.
The in-vehicle system according to claim 1 or 2,
The in-vehicle system, when the setting unit determines that the lighting state is determined by the determining unit, increases a period for acquiring the plurality of output values compared to a case where it is determined that the lighting state is not determined .
The in-vehicle system according to claim 1 or 2,
The setting unit is configured to set the display mode based on the plurality of output values acquired in a predetermined period.
The vehicle-mounted system in which the predetermined period when the determination unit determines that the lighting state is present is longer than the predetermined period when the determination unit determines that the lighting state is not included.
It is an in-vehicle system according to any one of claims 1 to 4,
When the determination unit determines that the lighting state is the lighting state, the setting unit sets the display mode without referring to the one or more output values whose brightness exceeds a predetermined threshold. system.
The in-vehicle system according to any one of claims 1 to 5,
The determination unit detects that the headlight of the oncoming vehicle is lit by vehicle-to-vehicle communication or road-to-vehicle communication, and the brightness of the front of the vehicle exceeds a predetermined threshold by the detection unit. The vehicle-mounted system which determines with the said lighting condition at least any one of them when it is determined.
An in-vehicle system (1) mounted on a vehicle and configured to display an image forward as viewed from a passenger of the vehicle,
A detection unit (10) configured to detect at least the illuminance in front of the vehicle;
A setting unit (34) configured to set a display mode of a displayed image based on a plurality of the illuminances detected at different timings;
A determination unit (35) configured to determine whether or not the plurality of illuminances exceed a predetermined threshold,
When the setting unit determines that at least one of the illuminances is equal to or greater than the threshold, the setting unit does not refer to the at least one illuminance, or more than at least one of the illuminances determined not to be equal to or greater than the threshold. An in-vehicle system that sets the display mode while reducing the influence on the setting of the display mode.
It is an in-vehicle system given in any 1 paragraph of Claims 1-7,
The in-vehicle system displays the image by a head-up display.
A display device (30) mounted on a vehicle and configured to display an image forward when viewed from a passenger of the vehicle,
An acquisition unit (33) configured to acquire at least an output value of the detection unit (10) configured to detect brightness in front of the vehicle;
A setting unit (34) configured to set a display mode of an image to be displayed based on a plurality of the output values detected at different timings;
A determination unit (35) configured to determine whether or not a headlight of an oncoming vehicle that is a vehicle that runs opposite to the vehicle is in a lighting state;
The setting unit does not refer to at least one of the output values acquired when the determination unit determines that the lighting state is the lighting state, or acquires when it is determined that the lighting state is not the case. A display device that sets the display mode with a smaller influence on the setting of the display mode than the at least one output value.