JP3462036B2 - Display method of navigation device for mobile object - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device mounted on a moving body such as an automobile, and more particularly, to a map such as a cathode ray tube to display a map and the current position of the automobile, a running locus, etc. The present invention relates to a display method of a navigation device for a mobile body, which provides travel information to the user.

[0002]

2. Description of the Related Art Generally, a navigation device mounted on a moving body such as an automobile stores a national map or a regional map divided into a plurality as map information in a map storage means.
The map information is read out in response to the operator's request and displayed on a display such as a cathode ray tube to provide a map for traveling.

Further, the present position of the vehicle is calculated by the calculation based on the detection signals from the distance sensor which detects the traveling distance of the vehicle and the direction sensor which detects the traveling direction. A triangular mark indicating the current position of the vehicle and a running locus are displayed at a plurality of consecutive points so that the position of the vehicle can be visually recognized on the map on the screen (for example, Japanese Patent Laid-Open No. 58-53711, JP-A-59-39800, JP-A-60-165511
(See Japanese Patent Publication).

In the above-mentioned conventional device, when the function key is operated while the vehicle is traveling, a map showing the current position is displayed on the screen as the vehicle is traveling, and information necessary for traveling is displayed. Is provided.

[0005]

However, in the above-mentioned conventional device, when the vehicle is traveling, it takes a long time from the key operation until the desired map is displayed on the screen, and there is a waiting time before starting. There was a problem with it.

That is, when it is desired to set the starting point of the vehicle to a predetermined geographical coordinate, for example, at home, first, a detailed map is selected from the wide area map by key operation and displayed on the screen,
After selecting a desired district map from this detailed map, it is necessary to set the center of geographical coordinates in the center of the screen. At this time, a desired map is selected while looking at the map displayed on the screen, but the detailed district map is divided into a plurality of map blocks and stored according to the screen. When each map block is read out from the device and displayed on the screen of the display device, each map block is sequentially drawn. Therefore, it takes several tens of seconds until all map blocks are completely drawn.

The present invention has been made in view of the above problems, and speeds up the time for reading out map data or the like from the map storage means and drawing it on the screen of the display unit so that the center of the geographical coordinates is located at the center of the screen. The display method of a navigation device for mobiles that greatly reduces the waiting time when setting a map and simplifies map selection and current position setting operations
It is intended to provide the law .

[0008]

Means for Solving the Problems A display method of mobile navigation system according to the present invention, stores the map in a predetermined storage medium, and displays on the display device the map read from the storage medium , Displayed on the display device
In a navigation device configured to superimpose a current position display on a map, the map is divided into a plurality of areas, and the divided map is displayed as a base map and a road display on the map block. The line type data to be stored is separately stored in a storage medium, and when the navigation device starts displaying, a map block including predetermined geographical coordinates and a plurality of map blocks adjacent to the map block are extracted from the storage means. , The road display is first displayed on the display device, and thereafter, the road display is restored on the display device based on the line type data corresponding to the map block including the predetermined geographical coordinates and a plurality of map blocks adjacent to the map block. It is configured to display.

Further, the predetermined geographic coordinates are set and displayed in the approximate center of the display device.

The predetermined geographical coordinates are the current position of the moving body.

[0011]

In the present invention, the table of the navigation device is
A map that contains the specified geographical coordinates that will be the base map at the start of display.
The block and a plurality of map blocks adjacent to the map block are displayed first, and then the map block and the map block including predetermined geographical coordinates based on the line type data are displayed .
The road display of a plurality of adjacent map blocks is restored.

Further, a map block is displayed so that a predetermined geographical coordinate is set substantially in the center of the display device, and the predetermined geographical coordinate is set substantially in the center of the display device.

Further, the predetermined geographical coordinates are the current position of the moving body, and the map block including the current position of the moving body and the road are displayed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a navigation device for a mobile body, FIG. 2 is a front view of a display device, and FIG. 3 is a schematic configuration diagram for explaining the principle of the present invention. In the figure, (1) is a control unit including various I / O circuits (2), (3) and (4) and input / output ports (5) and (6), and a CPU (7)
A CRT controller (hereinafter abbreviated as CRT / C) (9), etc., receives a stabilized power supply from a vehicle battery via a constant voltage circuit and operates to control various devices. .

(2) is a first I / O interface circuit, which is a navigation (1
1), traffic information (12) for receiving road conditions, wireless telephone (13) for automobiles, air conditioner (14) for indoor air conditioning,
Each mode such as a television (15), a radio (16), a tape (17) and a CD (18), which are audiovisual sources, can be selected via the function switches (SW1) to (SW8). The function switches (SW1) to (SW8) are the CRT (26) shown in FIG.
It is arranged on the front panel (26b) of the above, and a drive signal is given to the CPU (7) by a pressing operation to operate each device.

Further, the first I / O interface circuit (2) receives a radio wave from an artificial satellite via an antenna and can confirm or determine the current position and moving speed of the automobile (GPS device ( 19) and a fluxgate-type geomagnetic detector fixed to the vehicle to detect the geomagnetism by decomposing it into a vehicle traveling direction component and its vertical component,
A direction sensor (20) that outputs a signal corresponding to this as the traveling direction θ of the vehicle is connected.

(3) is a second I / O interface circuit, which is connected to a distance sensor (21) which detects the rotation of the wheel by an electromagnetic pickup, a reed switch or the like and outputs a pulse signal proportional to the rotation speed. ing. In addition,
The azimuth sensor (20) and the distance sensor (21) serve as current position detection means for obtaining the current position data of the vehicle and the travel locus data.

Reference numeral (4) is a third I / O interface circuit, which is a television tuner (22), a radio tuner (23), a tape deck (24) and a CD deck (2).
Video / audio equipment such as 5) is connected. This CD deck (25) has a CD-ROM which is a map storage means.
(25a) is provided, and the navigation (1
At the time of selecting 1), various map information and line diagram data, which will be described later, are read out and can be displayed on the CRT (26).
As the above CD / ROM (25a), NIKK
EI. ELECTRONICS. November 26, 1987
A memory for storing map information described in the Japanese issue (NO434) is adopted, and map information such as national maps, regional maps, regional maps, and district maps is stored as vector data. Further, in this example, the maps are classified into three types, that is, wide area, standard, and detailed, each having a different scale, and the map information is stored so as to include the same area. The district map is divided into four areas corresponding to the four quadrants of the screen (26a) of the CRT (26), and four map blocks are partial maps, and one map block that is a part of this partial map. 4 times the screen of CRT (26) (26
The data is sequentially stored in the CD / ROM (25a) as map information so as to be the background of a). In addition, a diagram connecting points on this district map, such as a road,
A diagram showing a river, a bridge, etc. is decomposed into diagram data and stored, and character data such as characters and symbols, and service data such as hotels and golf courses as service symbols are also stored. And the roads, rivers,
A specific item such as a bridge is stored with a plurality of color codes in order to be displayed in various colors. Also,
In addition to this color code, it has a plurality of memory tables in which a large number of color palette color codes are stored so that the above items can be displayed in other colors. Further, the dot data for shadowing the screen (26a) and the dot data for shadowing the area for displaying the icon as the touch pattern on the screen (26a) are also stored.

(7) is a CPU, which controls the operation of the video / audio equipment based on the selection operation of the function switches (SW1) to (SW8), and the CD.
The map information etc. is read from the ROM (25a) and the CRT (2
The control signal for displaying on the screen (26a) of 6) is C
Give to RT C (9). Also, INT (interrupt circuit)
The pulse signal from the distance sensor (21), the GPS signal from the GPS device (19) and the signals of the X and Y components from the azimuth sensor (20) are received via (7a), and the arithmetic processing is executed to drive the vehicle. The traveling locus and the current position, which are the route information, are obtained and a display signal is output.

(8) is a RAM for temporary storage which is a temporary storage means. As shown in the schematic view of FIG.
In the process in which U (7) performs arithmetic processing, the above-mentioned CD-ROM (2
The power source is always backed up from the on-vehicle battery so that the data read from 5a) can be temporarily stored and held. Then, when the map information is read out, the line drawing data is also read out, and when the desired map is selected, the data is taken out so that various line drawings are superposed on the map. Further, in order to display the traveling locus on the screen (26a) of the CRT (26), a memory table for storing position data is provided. In this example, the CD / ROM (25
It has a plurality of endless memory tables corresponding to the map information of different maps stored in a).

(9) CRT / C which is a display control means
(CRT controller), which receives a command for outputting a display signal from the CPU (7) and expands the travel route information in the display RAM (10), and also expands the expanded map data and character data. It outputs a video signal and a sync signal for displaying the traveling route information and the like on the CRT (26). The above CPU
(7) is the above 4 stored in the CD-ROM (25a)
Of the partial map information which is a map block, wide area, standard and detailed map information, map information corresponding to one designated scale and traveling locus information corresponding to this map information are stored in the memory table of the RAM (8). It is designed to be read from and displayed on the map of the traveling locus.

Reference numeral (10) is a display RAM, which is a pattern for displaying operation keys for driving the above-mentioned various devices as touch switches on the screen (26a) in addition to additional information such as map numbers and types of scales. The data is stored.
As the pattern data, the current position mark (M) displayed in a triangle on the screen (26a) of the CRT (26).
(See Fig. 3), multiple points (dots) that are continuous along the travel path
The locus display pattern, which is the first mode for displaying with,
The trajectory non-display pattern, which is the second mode for deleting the displayed trajectory from the screen (26a), is the CPU.
It is stored as a switching unit that gives a switching signal to (7), that is, a touch switch. Although not shown, a scroll key pattern that constitutes a map moving means for arbitrarily moving the map displayed on the screen (26a),
The current position mark (M) displayed on the screen (26a)
When the correction position mark which is the correction position mark display means for correcting the position of the position, the return pattern which is the map movement return means for returning the moved map to the original position and the present position mark (M) are moved, A correction pattern or the like, which is a current position mark correcting means for moving to the position of the use position mark, is stored. Furthermore, although illustration is omitted,
The enlargement / reduction pattern for selecting the map scale is also stored.

(26) is a CRT which is a display,
The map, the traveling route, the current position and the like of the specific area are displayed in color by the video signal and the synchronizing signal from the CRT / C (9). Further, various operation keys of the touch switch section described later are displayed on a predetermined touch area, and the TV tuner (22) is turned on by pressing the function switch (SW5) to display a TV image. There is.

Reference numerals (27) and (29) denote light emitting units connected to the CPU (7) through the output port (6), and (28) and
Reference numeral (30) is a light receiving portion connected to the CPU (7) through the input port (5), which is disposed on the surface of the CRT (26) and constitutes a touch panel portion of the touch switch. . Although not shown in the figure, the touch panel section divides the touch area in the row direction and the column direction into a large number, and when a specific touch area among the touch areas is touch-operated, the touch area is changed to the row direction. The infrared light passing through the intersection with the column direction is cut off, and drive signals for giving various instructions are output. Specifically, when the screen (26a) is touched, the operation pattern is displayed on the inner peripheral portion of the screen (26a), and when any of the patterns is touched, the operation start or stop setting of each device, time, It is possible to set numerical values and the like.

Next, the operation of the navigation device for a moving body constructed as described above will be described with reference to the flow charts shown in FIGS. 4 and 8 to 12. First of all, when the key switch is turned on at the start of driving the car,
Upon receiving the power supply from the vehicle-mounted battery, the electric system of each part is activated. When the CPU (7) of the control unit (1) is powered on, it is activated by the stabilized power supply, initialization is performed in step S11 of the flowchart shown in FIG. 4, and the arithmetic processing shown in the main routine of FIG. Number 10
It is repeated at a cycle of about msec. Next, step S
In step 12, function key processing is performed, and subsequently, in step S13, touch switch input processing is performed. At this time, in step S14, for example, when the operator presses the function switches (SW6) and (SW4) of the radio (16) and the air conditioner (14), the process proceeds to step S15 and the screen (26a) of the CRT (26).
Displays a radio mode pattern as shown in FIG. 5 or an air conditioner mode pattern as shown in FIG.
Then, by touching the area of the switch pattern provided on the display screen of each mode, the selected device can be operated according to the desired setting. Even during such operation, the process proceeds to step S16, and the CPU
(7) executes current position calculation processing and the like. First, as shown in the flowchart of FIG. 8, the distance traveled by the vehicle is detected by the distance sensor (21) in step S21. Next, in step S22, the distance sensor (2
Upon receiving the pulse signal from 1), the interrupt calculation of the current position is performed at a predetermined time interval. Then, in step S23, the current position data and the traveling locus data obtained by this calculation are sequentially stored in the RAM (8) for temporary storage. With this, when the car starts running,
It is possible to obtain travel route information such as a travel distance and a travel locus to the current position.

First, when the automobile is driven, as shown in the flow chart of FIG. 9, a pulse signal is output from the distance sensor (21) and C is transmitted via the INT (7a).
Given to PU (7). Then, the number of pulses N is added by the CPU (7) to obtain the traveling distance up to the present (step S31).

Next, as the vehicle runs, the interrupt processing routine shown in the flowchart of FIG. 10 is started.
First, in step S41, for a certain period of time, for example, 1
The number of pulses N from the vehicle speed sensor is read at intervals of seconds. Next,
In step S42, the number of pulses N at this time is multiplied by the unit traveling distance d, for example, 39.25 cm, to obtain the traveling distance D for each fixed time. And
In step S43, the azimuth θ from the azimuth sensor (20) is read. Then, in step S44, the position of the vehicle on the two-dimensional coordinates is obtained from the azimuth θ and the traveling distance D by the following equation.

Δx = D · cos θ △ y = D · sin θ

Thereafter, the current position (x, y) of the vehicle is obtained from the coordinates (Δx, Δy) calculated in step S45 and the coordinates (xo, yo) of the starting point by the following equation.

Xn + 1 ← xn + Δx yn + 1 ← yn + △ y

As a result, the running distance D to the current position, which changes moment by moment, is obtained, and the latitude and longitude are fixed at regular intervals, so that the current position (x, y) can be known. This data is sent to the RAM (8) for temporary storage and is sequentially stored therein. In the RAM (8), while the data at the current position (x, y) is written,
Old data is erased one after another, which is a so-called endless method. Further, even if the automobile is stopped and the key switch is turned off, the data of the current position (x, y) and the traveling distance D can be held.

Incidentally, in step S46, the count of the pulse number N is cleared. Then, step S4
In step 7, the GPS signal is received from the GPS device (19) and the arithmetic processing for performing the GPS processing is executed. As a result, the absolute value of the latitude and longitude is determined every fixed time, for example, every second, so that the travel route information can be corrected. By the way, when the vehicle is to be departed, the navigation (11) is operated to set the departure point to a predetermined geographical coordinate, for example, the home on the district map which is a detailed map.

Now, when the function switch (SW1) of the navigation (11) is pressed, the CRT
On the screen (26a) of (26), as shown in FIG. 7, a menu is displayed, and a setting pattern which is a touch area for selecting a map and the current position is displayed. As a result,
The map display mode shown in the flowchart of 1 is started,
If the map selection setting pattern is touched when the menu is displayed on the screen (26a) in step S51, it is determined in step S52 whether the map is selected or the current position. When the pattern at the current position is touched, the process proceeds to step S53, but since the map selection is set at this time, the CD / RO storing the map information is stored.
The map information of the Japan map is read from M (25a), and as shown in FIG. 13 (a), the screen (26) of the CRT (26) is displayed.
A map of Japan is displayed in a) (step S54).
Next, when a part of the region, for example, the Kinki pattern, is pressed from the map of Japan, the region map is selected in step S55, and the screen (26a) is switched. As a result, the process proceeds to step S56, and a map of the Kinki region is displayed as shown in FIG. 13 (b). Then, in step S57, if a part of this local map, for example, Hyogo prefecture is selected and the pattern is pressed, the process proceeds to step S58, and as shown in FIG. 13 (c), a regional map centered on Hyogo prefecture is displayed on the screen ( 26a)
Is displayed in. Further, when a desired area is selected from this area map and the area on the screen (26a) is touched, the process proceeds to step S59, and area map selection processing is performed.
At this time, a command signal is output from the CPU (7) to the CRT / C (9) in step S60, which is the coordinate setting means, and the coordinates of the home, which is a predetermined geographical position, are the CRT.
It is instructed to set the center of the screen (26a) of (26).

As a result, the map information of the map block including the above coordinates and the map information of the map block adjacent to this map block are read out from the CD / ROM (18) and temporarily stored in step S61 which is the data storage means. Is stored in the RAM (8) for use in the computer. Along with this, the process proceeds to step S62, where the map information is sent to the CRT (26) and the screen (26a) has a map block centered on the coordinates of the home and a total of four map blocks adjacent thereto. Is drawn.

Step S63 is the first drawing means, C
The point data and line type data of the map block including the above coordinates are read from the D-ROM (25a) and stored in the RAM (8) for temporary storage. Then, this data is C
Since it is immediately sent to the RT (26), the screen (26a) is restored as a diagram showing roads, rivers, bridges and the like. Step S64 is the second drawing means, which is the CD / ROM (2
5a) RAM for temporary storage for reading out part of the point data and line type data of the adjacent map blocks
Store in (8). Then, this data is CRT (2
Since it is immediately sent to 6), the screen (26a) is restored with a diagram continuous with the diagram of the central map block and is drawn on the district map as shown in FIG. 13 (d). The desired district map is displayed. A drawing like this
The map information and various data are read from the CD-ROM (18), stored in the RAM (8) for temporary storage, and at the same time transferred to the CRT (26). The map is displayed on the screen (26a) within a few seconds from. As a result, the CRT (26) screen (26
The home and vehicle positions, which are the geographical centers of the map drawn in the center of a), are set.

After that, when the car is oscillated, the CD / R
The map information is sequentially read from the OM (18), and the CRT (2
The map drawn on the screen (26a) of 6) is automatically switched according to the traveling direction, so-called scrolling is performed and the traveling information is provided to the driver. In this state, stop driving, turn off the key switch, and navigate (1
When the power of 1) is turned off, the current position at this time is stored in the RAM (8) for temporary storage. Next, an operation of selecting the current position when the vehicle starts traveling again will be described. First, the key switch is turned on, and the function switch (SW1) of the navigation (11) shown in FIG. 1 is pressed.

Next, in order to set the starting point to the current position prior to traveling, the current position area setting pattern displayed on the screen (26a) of the CRT (26) is pressed.
The arithmetic processing of the subroutine shown in is executed. At this time, a command signal is output from the CRT (26),
In step S71 in which C (9) is the coordinate setting means, the coordinates of the own vehicle at a predetermined geographical position are CRT (2
It is instructed to set it at the center of the screen (26a) of 6). As a result, step S72, which is the data storage means
At, the map information of the map block including the coordinates of the vehicle position and the map information adjacent to this map block are read out and stored in the RAM (8) for temporary storage. Then, in step S73, this map information is sent to the CRT (26), and the screen (26a) displays a map composed of a map block centered on the coordinates of the own vehicle and a map block adjacent to the map block. It In step S74, which is the first drawing means, the point data and line type data of the map block including the above coordinates are read from the RAM (8) for temporary storage and stored in the RAM (8) for temporary storage. At this time,
Since this data is immediately sent to the CRT (26), various diagrams are restored on the screen (26a).

Further, step S75 which is the second drawing means.
Then, part of the point data and line type data of the adjacent map blocks are read from the CD / ROM (18) and stored in the RAM (8) for temporary storage. Then, this data is immediately sent to the CRT (26), so that a diagram that is continuous with the diagram of the central map block is restored on the screen (26a) and drawn on the district map. Since such a drawing is made within a few seconds after the setting operation of the current position is performed, the current position of the own vehicle becomes the center of the map displayed on the screen (26a) and the current position is departed. It becomes possible to start the car as a point.

As described above, in this embodiment, the area map, which is a detailed map, is divided into four map blocks and stored, and the line map corresponding to this map is divided into C blocks.
It is stored in the D / ROM (18), and when the map is selected or the current position is set at the start of navigation, the map information and various data are read from the CD / ROM (18) for temporary storage. It is stored in the RAM (8) and is drawn on the screen (26a) of the CRT (26). Therefore, the time from the setting operation to the display on the screen (26a) is several seconds, and there is a waiting time such that the map block is drawn in the quadrant of the screen (26a) which is predetermined as in the past. Since the time runs out, the time for displaying the map on the screen (26a) during traveling of the automobile is significantly shortened. Also, the screen (2
When the map is drawn in 6a), the coordinates of the map indicating the current position are set in the center of the screen (26a), so that if the drawing of the map block including the own vehicle position is completed, the own vehicle position can be quickly changed. It is possible to recognize and immediately start running.

When a map is drawn on the screen (26a) of the CRT (26), a predetermined geographical coordinate (xo, yo) can be set at the center of the screen (26a) based on a command signal. After the traveling of the automobile is stopped, it is not necessary to re-determine the position of the vehicle each time the vehicle starts to move again, and there is an effect that the complicated handling operation is released.

[0041]

As described above, the present invention is a navigation system.
Display at the start of the ® emission devices, the road display with no map block is displayed on the above, to shorten the time you do not see the map on the screen, to reduce the discomfort of the user, then, the road by line type data of the map block The display can be restored and the information required by the user can be provided.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a front view of a display device.

FIG. 3 is a schematic explanatory diagram for explaining the principle of the present invention.

FIG. 4 is a flowchart showing an overall calculation process of a main routine in a control unit.

FIG. 5 is a diagram illustrating a type of menu displayed on the screen of the display unit.

FIG. 6 is a diagram illustrating a type of menu displayed on the screen of the display unit.

FIG. 7 is a diagram illustrating a type of menu displayed on the screen of the display unit.

FIG. 8 is a flowchart showing a calculation process of a main routine.

FIG. 9 is a flowchart showing a calculation process based on a distance pulse from a distance sensor.

FIG. 10 is a flowchart showing an interrupt calculation routine based on a distance pulse from a distance sensor and a signal from an azimuth sensor.

FIG. 11 is a flowchart showing detailed calculation processing of a map selection setting routine.

FIG. 12 is a flowchart showing detailed calculation processing of a current position setting routine.

13A to 13D show display examples of maps drawn on a display.

[Explanation of symbols]

1: control unit, 7: CPU, 8: temporary storage means (RA
M), 9: CRT / C, 10: RAM for display, 11:
Navigation, 20: direction sensor, 21: distance sensor, 25a: map storage means (CD / ROM), 26: display (CRT)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tominaga Toshimichi 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Kazuhiro Yokouchi 2-33 Miwa, Mita Mitsubishi Electric Corporation Ceremony Company Mita Factory (72) Inventor Hirofumi Goto 2-33 Miwa, Mita City Mitsubishi Electric Corporation Ceremony Company Mita Factory (72) Inventor Katsumi Okawa 2-33 Miwa, Mita City Mitsubishi Electric Corporation Ceremony Company Mita Seisakusho (56) Reference JP-A-59-42413 (JP, A) JP-A-62-154063 (JP, A) (58) Research field (Int.Cl. ⁷ , DB name) G09B 29/10 G08G 1/0969

Claims (3)

(57) [Claims] 1. A map is stored in a predetermined storage medium, and the map read from the storage medium is displayed on a display device.
At the same time, display the current location on the map displayed on the display device.
In a navigation device configured to be displayed in an overlapping manner, the map is divided into a plurality of areas, and the divided map is used as a base map and line type data for displaying a road display on the map block. The map block including the predetermined geographical coordinates set and a plurality of map blocks adjacent to the map block are extracted from the storage means at the start of display of the navigation device, Display on the display device first,
After that, the road display is restored based on the line type data corresponding to the map block including the predetermined geographical coordinates and a plurality of map blocks adjacent to the map block, and is displayed on the display device. For displaying a navigation device for a mobile body. 2. A method of displaying a navigation device for a mobile body according to claim 1, wherein the predetermined geographical coordinates are set and displayed substantially in the center of the display device.
Law . 3. The method for displaying a navigation device for a mobile body according to claim 1, wherein the predetermined geographical coordinate is a current position of the mobile body.