JPH06111193A - Traffic information display device for vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] When the road traffic information of an area that is not displayed on the CRT screen is received, the road map including the position of the own vehicle and the point related to the road traffic information is used to drive the own vehicle. (EN) Provided is a road traffic information display device which can be appropriately displayed according to a state. [Structure] When traffic information indicating that traffic congestion has occurred in a predetermined wide area not displayed on the screen of the CRT 1 is received, the control unit CU causes the vehicle position and the traffic congestion occurrence point. A road map including and is displayed on the CRT screen at a scale as large as possible, and then this scale is changed according to the traveling of the own vehicle. With this, while displaying the location of traffic congestion,
A precise road map that is as large as possible is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle traffic information display device.

[0002]

2. Description of the Related Art A road map around a vehicle position is displayed on a CRT screen mounted on an automobile, and various road traffic information such as a vehicle position or a traffic congestion occurrence point is also displayed on the road map. BACKGROUND ART A vehicle traffic information display system for informing a driver has been conventionally known. And
In such a traffic information display system, normally, a sensor that detects various kinds of information for calculating the vehicle position, a tuner that receives a radio signal including traffic information transmitted from a transmitting station, and a road map are stored. A control unit that includes a CD-ROM and that displays a road map or the like with predetermined characteristics on a CRT screen is provided.

By the way, in general, a CRT screen cannot display a very fine figure on the screen because of its structure. Therefore, in the conventional road traffic information display system, the road map normally displayed on the CRT screen is displayed at a relatively large scale (for example, 1/2500) so that the surrounding road shape can be displayed as accurately as possible. It However, when such a large scale is used, only a relatively narrow road map can be displayed on the CRT screen. Therefore, there is a problem that only the road traffic information in a relatively narrow area can be obtained from the CRT screen.

Accordingly, a relatively large scale (for example, 1/2
500), when the road map is displayed, and when the traffic information regarding the area not displayed on the CRT screen is received, the vehicle position is automatically set for a predetermined time,
A road traffic information display system has been proposed in which the scale is switched to a small scale (for example, 1/25000) so that the point related to the traffic information is displayed on the same CRT screen (for example, actual Kaihei 1- No. 133700).

[0005]

However, in the conventional traffic information display system as disclosed in, for example, Japanese Utility Model Laid-Open No. 1-133700, the position of the vehicle and the position of the traffic information at the time when the traffic information is received. Since the scale is uniquely determined by the positional relationship with and the subsequent change in the running state of the own vehicle is not taken into consideration, there is a problem that an appropriate road map is not displayed according to the running state of the own vehicle.

The present invention has been made in order to solve the above-mentioned conventional problems, and when road traffic information about an area which is not displayed on the CRT screen is received, the position of the vehicle and An object of the present invention is to provide a road traffic information display system capable of appropriately displaying a road map including points related to road traffic information according to the traveling state of the vehicle.

[0007]

In order to achieve the above object, as shown in FIG. 1, a first invention is to display a current traveling position of a vehicle and a map around the traveling position on a display screen with a predetermined display characteristic. The display means A1 for displaying, the road traffic information receiving means A2 for receiving road traffic information, and the fact that a predetermined traffic situation has occurred in a predetermined area around the current traveling position of the vehicle by the road traffic information receiving means A2. When received, the display means A is arranged so that the position where the traffic situation is occurring and the current traveling position of the vehicle are displayed on the same display screen.
In the vehicle traffic information display device provided with the display characteristic changing unit A3 for changing the display characteristic of No. 1, the display characteristic changing unit A3 displays the current traveling position of the vehicle and the position where the traffic situation occurs. In accordance with the change in the relationship, the display means A
There is provided a vehicle traffic information display device characterized in that the display characteristic No. 1 is automatically changed.

According to a second invention, in the vehicle traffic information display device according to the first invention, the display characteristic changing means A3 is
After changing the display characteristics of the display means A1 due to the occurrence of a predetermined traffic situation, the display characteristics of the display means A1 are sequentially changed according to the approach of the current traveling position of the vehicle to the position where the traffic situation occurs. Provided is a vehicle traffic information display device characterized by being restored to the previous display characteristics.

[0009]

EXAMPLES Examples of the present invention will be specifically described below.
The road traffic information display device according to the present invention is basically
The road map around the vehicle position is displayed on the CRT screen at a predetermined scale, and the position of the vehicle and various traffic information transmitted from the transmitting station are also displayed on the CRT screen at the same time. The traffic information in the area corresponding to the existing road map is displayed. In addition to this, CRT
Road traffic information that informs that a predetermined traffic situation has occurred in an area that is not displayed on the road map on the screen,
For example, when the traffic information that informs the occurrence of traffic congestion is received, a road map including the position of the own vehicle and the point where the above traffic situation occurs (for example, the traffic congestion occurrence point) is appropriate for the traveling of the own vehicle. It is designed to be displayed on the CRT screen at a reduced scale.

As shown in FIG. 2, specifically, the road traffic information display device substantially displays the road map around the vehicle, the vehicle position, and the road traffic information on the screen of the CRT 1.
And a control unit CU for controlling an image (information) to be displayed on the CRT screen, an information detecting section SE for detecting various kinds of information necessary for detecting the own vehicle position, and a transmission station. Tuner TU that detects traffic information from multiplexed FM radio waves and sends it to control unit CU
It consists of and.

The control unit CU includes a CPU 2 which is a microprocessor, a ROM 3 which stores a control program and the like, a RAM 4 which is used as a work area, and a CD-ROM 5 which stores a road map.
And an interface 6 serving as an input / output port for various signals. And the control unit CU
Controls the image displayed on the screen of the CRT 1 according to various input information and road map data in the CD-ROM 5. The information detecting section SE is composed of a geomagnetic sensor 7 and a wheel rotation speed sensor 8.

The tuner TU includes a high-frequency amplifier 12 that performs high-frequency amplification on the multiplexed FM radio wave received by the antenna 11, and a local oscillation signal oscillated from a local oscillator 18 into the multiplexed signal amplified by the high-frequency amplifier 12. , A frequency mixer 13 for mixing the intermediate frequency, an intermediate frequency amplifier 14 for amplifying the intermediate frequency, and an F for detecting an ordinary FM broadcast signal from the multiplexed signal output from the intermediate frequency amplifier 14.
It is composed of an M detector 15 and an FM multiple detector 16 which detects a road traffic information coded signal from the above multiplexed signal. Here, the FM broadcast signal detected by the FM detector 15 is transmitted to the speaker 17 and converted into audio. The road traffic information coded signal detected by the FM multiplex detector 16 is input to the interface 6 of the control unit CU.

Hereinafter, C by the control unit CU
Image control of the RT screen will be described. The control unit CU basically controls the CRT 1 as follows. a) The vehicle position is calculated based on the geomagnetic sensor detection value and the wheel rotation speed detection value, and a road map around the vehicle position is set so that the vehicle position becomes the center.
It is displayed on the CRT screen at a basic scale (for example, 1/2500). Therefore, as the vehicle position changes, CR
The road map displayed on the T screen changes automatically. The vehicle position is displayed in the center of the screen in principle. b) In principle, all the various road traffic information in the area corresponding to the road map actually displayed on the CRT screen is CR.
Display on T screen.

C) Road traffic information indicating that a predetermined important road traffic situation has occurred in an area which is not displayed on the road map on the CRT screen and is within a predetermined range, for example, When the road traffic information that informs the occurrence of traffic congestion is received, a road map including the position of the own vehicle and the point where the above important road traffic situation has occurred (for example, the traffic congestion occurrence point) at the largest possible scale. CR
Display on T screen. Then, after that, the scale is changed (scrolled) according to the traveling of the own vehicle. Therefore, when the own vehicle is traveling toward the point where the important road traffic situation occurs, the scale gradually increases as the vehicle approaches.

When the control of the above c) is performed, the road map displayed on the CRT screen is, for example, FIG. 4 → FIG. 5 → FIG.
→ Change as shown in Fig. 7. 4 to 7, V indicates a vehicle, W indicates a road, and L indicates traffic congestion. Further, x _{0 to} x ₃ indicate positions on the road W. That is, as shown in FIG. 4, when the vehicle V is traveling at the basic scale, the region R ₁ is displayed on the CRT screen, and the region displayed at this time is limited to a narrow range, but the road shape is precise. Is displayed in. Here, when traffic congestion L occurs at the position x ₀ , the scale becomes smaller as shown in FIG.
₂ is displayed on the CRT screen, and the vehicle position x ₁ and the traffic jam position x ₀
The positional relationship of can be recognized. Then, for example, as shown in FIG. 6, when the host vehicle V advances to the position x ₂ , the scale becomes large according to the position x ₂ of the host vehicle V and the region R
₃ is displayed on the CRT screen, and at this time, the road map as precise as possible (large scale) is displayed while displaying the traffic jam position x ₀ . Further, as shown in FIG. 7, when the vehicle V travels and reaches the position x ₃ , the scale returns to the basic scale and the region R ₄ is displayed on the CRT screen. In this way, it is possible to recognize the most precise road shape according to the progress of the own vehicle while recognizing the positional relationship between the vehicle position and the traffic congestion position from the time when the traffic congestion L occurs until the traffic congestion L approaches. become.

In the above-mentioned image control by the control unit CU, the control of a) and b) is an ordinary control which is generally performed, and therefore the description thereof is omitted. Only the control will be described according to the flowchart shown in FIG.

In step # 1, the flag F is set to 0 as an initial value. This flag F is an area outside the area displayed on the CRT screen and within a predetermined range.
A flag that is set to 1 (hereinafter referred to as a wide area) when a certain important road traffic situation occurs and is set back to 0 when the scale of the CRT screen returns to the basic value (1/2500). Is.

At step # 2, the initial vehicle position is set. In this embodiment, based on the geomagnetic sensor detection value (azimuth) and the distance calculated from the wheel rotation speed sensor detection value (vehicle speed), a relative displacement vector with respect to the own vehicle position at the start of driving is calculated. This is because it is necessary to first input the position at the start of driving to the control unit CU in order to calculate the current position of the own vehicle.

In step # 3, the detected value of the geomagnetic sensor
(Azimuth) and the distance calculated from the wheel rotation speed sensor detection value (vehicle speed) are input, and in step # 4, the displacement vector from the start of operation is calculated based on the azimuth and the distance. The current vehicle position is calculated from the displacement vector and the vehicle position at the start of driving. In step # 5,
The frequency automatic sweep control is performed, the road traffic information coded signal is detected, and this road traffic information coded signal is input in step # 6.

In step # 7, it is compared whether or not the road traffic information indicating that a predetermined important road traffic situation (hereinafter, referred to as traffic jam for convenience) has occurred in the wide area is input. To be judged. As shown in FIG. 8, in this embodiment, the wide area is set to a fan-shaped area a centered on the vehicle position V ₁ . That is, the area a is an area in which the vehicle is likely to pass. Here, in the region a, the central angle is α in both rotation directions rather than the semicircle whose chord is the straight line N orthogonal to the traveling direction of the vehicle.
Each has a large fan shape. In this way, a margin is provided in the direction opposite to the traveling direction by α so that even if the road is bent over 90 °, it can be dealt with as much as possible. In addition, in FIG.
₁ is a road, L ₁ and L ₂ are traffic jams, respectively, and D ₁
Is an area displayed when the minimum scale (1/25000) is set, and D ₂ is an area displayed when the basic scale (1/2500) is set. In addition, here, α is set to 30 °.

If it is determined in step # 7 that the information indicating that traffic congestion is occurring in the wide area is not input (NO), the scale is reduced to the basic scale (1/2) in step # 12.
500), the flag F is reset to 0 in step # 13, the road map is displayed on the CRT screen at the basic scale (1/2500) in step # 11, and then the process returns to step # 3.

If it is determined in step # 7 that the information indicating that traffic congestion is occurring is input (Y
ES), if it is determined that F = 0 in step # 8 (Y
ES), that is, if a new traffic jam occurs this time, in step # 9, a scale as large as possible is set within the range including the vehicle position and the traffic jam point, and flag F is set in step # 10. 1 is set, and the road map is displayed on the CRT screen at the above scale in step # 11, and then the process returns to step # 3.

On the other hand, if it is determined in step # 8 that F ≠ 0 (= 1) (NO), except in step # 14 that it is determined that the traffic information is changed, step # 1
In step 5, the scale is changed so that the scale includes the position of the vehicle and the traffic jam position and is as large as possible according to the movement of the vehicle, and then the road map is CR at the above scale in step # 11.
After being displayed on the T screen, the process returns to step # 3.

Specifically, for example, as shown in FIG. 9, when traffic congestion L ₁ occurs in the wide area a in the state of the basic scale (1/2500), the scale is first changed to 1/25000. However, when the own vehicle V ₁ advances after this and the traffic congestion L ₁ enters the area b, for example, the scale is changed to 1/12500 (becomes larger). Further, when the vehicle V ₁ progresses and the traffic congestion L ₁ can be displayed on the CRT screen at the basic scale (1/2500), the scale is returned to the basic scale (1/2500). .

It should be noted that the traveling azimuth may not be the azimuth detected at each sampling time, but may be the azimuth calculated from the traveling position every 5 minutes, for example. In this way, it is possible to prevent the traveling direction from changing suddenly even when the vehicle turns at an intersection, and therefore, for example, α in area b
May remain at 30 ° and α in area a may be narrowed to 10 °.

As described above, according to such control, the occupant can recognize the mutual positional relationship between the traveling position of the vehicle and the place indicated by the road traffic information, and the vehicle can be moved along with the movement of the traveling position of the vehicle. It is also possible to recognize a detailed road map near the traveling position of.

[0027]

According to the first aspect of the present invention, the occupant can recognize the mutual positional relationship between the traveling position of the vehicle and the place indicated by the road traffic information, and move the traveling position of the vehicle. Accordingly, it is possible to recognize a detailed road map near the traveling position of the vehicle.

According to the second invention, basically, the same operation and effect as those of the first invention can be obtained. Further, as the vehicle approaches a point where a predetermined traffic situation occurs, the display characteristics are restored to the original display characteristics, so that the control is stable.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of first and second inventions corresponding to claims 1 and 2. FIG.

FIG. 2 is a system configuration diagram of a vehicle traffic information display device according to the present invention.

FIG. 3 is a flowchart showing a control method of CRT screen display by the control unit.

FIG. 4 is a diagram showing an area displayed on a CRT screen when a basic scale is set.

FIG. 5 is a diagram showing an area displayed on the CRT screen when a small scale is set due to traffic congestion or the like in an area not displayed on the CRT screen at the basic scale.

FIG. 6 is a view similar to FIG. 5 in a state in which the scale is increased as the vehicle advances.

FIG. 7 is a view similar to FIG. 5 in a state where the vehicle has further advanced and the scale has been returned to the basic scale.

FIG. 8 is a diagram showing a method of setting a wide area.

FIG. 9 is a diagram showing a change in a wide area as a vehicle advances.

[Explanation of symbols]

 CU ... control unit TU ... tuner 1 ... CRT 2 ... CPU

Claims (2)

[Claims] 1. A display means for displaying a current traveling position of a vehicle and a map around the traveling position on a display screen with predetermined display characteristics, a road traffic information receiving means for receiving road traffic information, and a road traffic information receiving means. When it is received by the means that a predetermined traffic situation has occurred in a predetermined area around the current traveling position of the vehicle, the position where the traffic situation occurs and the current traveling position of the vehicle are displayed on the same display screen. In a vehicle traffic information display device provided with display characteristic changing means for changing the display characteristic of the display means so as to be displayed, the display characteristic changing means generates the current traveling position of the vehicle and the traffic condition. A vehicle traffic information display device, characterized in that the display characteristics of the display means are automatically changed according to a change in the relationship with the position where the vehicle is located. 2. The vehicle traffic information display device according to claim 1, wherein after the display characteristic changing unit changes the display characteristic of the display unit due to occurrence of a predetermined traffic condition, the current traveling position of the vehicle is displayed. A vehicle traffic information display device, characterized in that the display characteristics of the display means are sequentially returned to the display characteristics before the change according to the approach to the position where the traffic situation is occurring.