JPH0330151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a driving trajectory display device for a vehicle, and particularly to a display device that superimposes and displays a current driving map and a driving trajectory on a display section of the driver's seat. It is something.

[Prior Art] In-vehicle navigators are well known for informing the driver of the current driving position of the vehicle, and have the advantage of freeing the driver from the tedious work of opening an atlas to check the driving position. This is extremely useful, especially when driving on unfamiliar routes. Conventional general navigators display a desired map on a display screen installed in front of the driver's seat, such as a CRT, or attach a map sheet, detect the current position of the vehicle using a direction and distance sensor, and display the map on the screen. It consists of a configuration that displays the trajectory sequentially.

Therefore, in such conventional devices, since the scale of the map displayed on the screen is constant, it is possible to display a map of the optimal size for driving on highways and on city roads near the destination. There was a problem with not being able to give directions.

Therefore, in order to solve such problems, vehicle travel trajectory display devices that can display maps of different scales have been proposed in the past. Different map data is stored in the memory, and the scale can be changed arbitrarily by the driver's switch operation.

In addition, as other conventional equipment,
114715, the optical system of the display section is equipped with a magnification adjustment device, which makes it possible to obtain projection images of different scales from one original image.

[Problems to be Solved by the Invention] However, each of the conventional devices described above has a problem in that changing the scale is complicated.

In other words, in the former conventional technology in which the scale is changed by the driver's switch operation, a specified scale is selected using a keyboard, etc., but the keyboard key arrangement is complicated when changing multiple types of scales. It may be difficult to install such a large keyboard on the instrument panel of the driver's seat, which has limited storage space, and the operation of specifying the scale is complicated, which may reduce the driver's concentration on driving. Ta. In addition, with conventional devices, the scale is changed while the map is displayed on the display screen, which takes a long time to change the scale, which is inconvenient when you want to quickly check direction information while driving. There was a problem that occurred.

In addition, with conventional devices using the latter optical system, when the screen is enlarged, details may become unclear because the same original image is used, and the desired effect may not be achieved in actual use. I had a problem that I couldn't do it.

The present invention provides an improved vehicle that can quickly change the scale with a simple operation and obtain desired direction information even while driving, from a map covering a wide area to a detailed enlarged map. The object of the present invention is to provide a travel trajectory display device for use in vehicles.

[Means for Solving the Problems] In order to achieve the above object, the present invention has at least a scale mode selection key and a scale instruction selection key on an operation unit such as a keyboard, and displays the scale separately from the normal map display. A display circuit for instructing a scale mode and displaying the scale mode on the screen is provided, and a scale selection circuit is further provided for reading map data of the selected scale. This has the advantage that the scale mode can be displayed on the screen at the same time as the map is displayed or independently, and the scale can be quickly changed.

[Function] According to the present invention, in normal driving conditions, the display unit displays the current driving map and the driving trajectory in an overlapping manner, and when scaling is required, the scale mode selection key on the operation unit A scale mode is displayed on the screen, and a desired scale is selected from this scale mode using a scale instruction selection key provided on the operation section, and the desired scale is quickly selected upon completion of the operation. The map is replaced with the reduced scale, and even after the map is replaced, the previous travel trajectory can be accurately displayed at a position corresponding to the reduced scale.

[Embodiments] Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 schematically shows a circuit of a preferred embodiment of the invention.

In FIG. 1, a display section 10 such as a CRT is provided in front of the driver's seat of the vehicle in an area that is easily visible to the driver, such as an instrument panel. The trajectories are displayed superimposed.

A characteristic feature of the present invention is that in addition to the map and travel trajectory on the screen of the display section 10, a scale mode is displayed as necessary, and each of these individual display data is displayed on the display section 10. A mixer 12 is provided for supplying.

A map ROM 14 is provided to store desired map data including the current position of the vehicle. In the present invention, the map ROM 14 stores a plurality of types of map data of different scales for the same area. Map data of a desired scale can be read out at any time, such reading operation is performed by the map data selection circuit 16, and the selected map data is supplied to the mixer 12 by the map display circuit 18.

The map display is displayed as a still image on the screen, and a trajectory display circuit 20 is provided to superimpose and display the trajectory of the vehicle on such a map. A desired travel trajectory is sequentially displayed on the map based on the signal, that is, the travel direction and distance information.

A characteristic feature of the present invention is that the scale of the map can be changed arbitrarily and that a scale mode is displayed on the screen when changing the scale.For this purpose, a scale mode display circuit 24 is provided, and a scale mode display circuit 24 is provided. Map data corresponding to map ROM
14, a scale selection circuit 26 is provided.

In order to set the scale, an operation section 28 including a keyboard etc. is provided near the display section 14 or at a location that is easy for the driver to operate, and from this operation section normal map display and scale mode switching signals are sent. The scale selection input in the scale mode is also performed.

The map data stored in the map ROM 14 is shown in Figures 2 to 5. Figure 2 shows an example of a map of a certain area, and this map is drawn at the maximum scale, so that it covers a wide area. Although it covers the area, it is almost impossible to identify the detailed road conditions.

Therefore, the map ROM 10 of the present invention stores a plurality of types of map data of different scales for this same area, and as shown in FIG. The map data is divided and stored in the map ROM 14 as shown in FIG. 5 as map data of three different scales shown in FIG.

That is, in FIG. 4, the maximum scale screen shown in FIG. 2 is indicated by a, and all nine areas A to I are displayed on one screen.

Screens with a smaller scale than this are shown as b to e, each representing 4 of the 9 areas in the whole area.
Shown in combination.

Further, smaller scale screens are designated f to n, each representing one of the nine minimum areas. As shown in FIG. 5, the map data a to n shown in FIG. 4 are sequentially stored in the addresses assigned to the areas shown in FIG. 2, respectively. Therefore, by specifying the start address of each of these stored contents, it is possible to arbitrarily read map data of a necessary scale.

FIG. 6 shows an example of a keyboard 30 provided on the operation unit 28 for switching between the map and scale mode, setting an initial position, or changing the scale in the map mode, and this keyboard has numeric keys 30a. , reset key 30b, input key 3
0c, a scale mode selection key 30d, a scale instruction selection key 30e, and a map mode selection key 30f, and desired data can be input by operating each key.

In the embodiment, the map and the scale mode are displayed on separate and independent screens, and when the scale mode is selected, the scale mode is displayed on the screen of the display unit 10 instead of the map display shown in FIG. FIG. 7 shows an example of such a scale mode screen, and the scale scale is 1/8000, 1/4000, and 1/1000, respectively, according to the three types of scales.
0a, and a cursor 10b that can be moved between the respective scales according to the selected scale. The scale scale 10a is a still image, and in the embodiment, it is read from display data provided in the map data selection circuit 16, and since the cursor 10b is a moving display, the scale scale in the scale mode display circuit 24 is read out from display data provided in the map data selection circuit 16. A display signal is read out from the radiator generator. FIG. 8 shows details of the map data selection circuit 16.
By designating the address B of the ROM 14, the map data at the predetermined address shown in FIG. 2 can be read out.

A multiplexer 34 and an adder circuit 3 are used to determine the preset value of the preset counter 32.
6 is provided, and the multiplexer 34 outputs a map selector 38, a map selection signal, and a scale designation signal A ₂ to
_A5 Then, the display signal corresponding to the scale display 10a from the scale data memory 40 is switched,
Signals A ₁ , M ₄ supplied at the start of the device, respectively
The corresponding signal is then selected by _M2 .
The map selector 38 allows the driver to set any map included in the current vehicle position by inputting from the keyboard 30 or the like, or the map selector 38 allows the driver to set any map included in the current vehicle position by inputting from the keyboard 30 or the like, or to always select predetermined large map data as it is from the multiplexer 34 when starting the device. may be supplied to

Any display data selected by the multiplexer 34 in this manner is supplied to the preset counter 32 via the adder circuit 36.
In the case of the scale change shown in FIG. 4, it is necessary to select a map enlarged according to the current location of the vehicle, and for this purpose, the current location data C is supplied to the adder circuit 36, and the scale signal A is The scale specified by ₂ to _A5 and this current location data are added together to provide the preset counter 32 with a preset value for selecting desired map data in the map ROM 14.

FIG. 9 shows an example of a map display circuit for displaying the map data read from the map ROM 14 on the display unit 10, and the map data E is
The data is written to the video RAM 44 via the port 42, and when the writing for one screen is completed, the end detection circuit 46 detects the I/O port 42 and the video RAM 44.
44 are respectively inverted to the read state and sent to the mixer 12, and the stored contents of the video RAM 44 are sent out. Scanning of video RAM 44 is specified by address counter 48.

FIG. 10 shows details of the trajectory display circuit 20 for displaying the trajectory of the vehicle, and the initial position data I input from the keyboard 30 at the start of the vehicle is converted to the map by the coordinate conversion circuit 50. After the coordinate data outputted from the adder circuit 36 of the data selection circuit 16 is operated, and especially after the coordinate transformation on the screen during scaling, the adder circuit 5 of the next stage
In step 2, the trajectory data K is added to the traveling detection signal H and the output thereof, the locus data K, is supplied to the matching circuit 54.
Travel locus data is recorded in the video RAM 56, and an address counter 56 is provided to scan addresses during writing/reading of the video RAM 56, and the writing or reading of the video RAM 56 is controlled. The function of the address counter 56 is to write and update data T for a predetermined travel distance, for example, every 50 m, in the travel detection section ₂₂ , which will be described later. RAM5
6 writes space on the entire screen and temporarily erases the travel trajectory up to that point.

Writing/reading of the position screen of the address counter 58 is detected by an end detection circuit 60, and input/output of the video RAM 56 is controlled by an I/O port 62.

When writing a normal running trajectory, the multiplexer 64 is switched by the output of the matching circuit 54 that compares the running data K and the address signal, and when the scanning address of the video RAM 56 and the running trajectory data match, The multiplexer 64 selects a predetermined character, such as a black circle, from the video RAM 56.
This is done at each timing T. Furthermore, in the case of the reduced scale mode, since the travel trajectory becomes a nuisance on the screen, the multiplexer 64 writes space on the entire screen, and as a result, the travel trajectory is erased from the screen. The video RAM 56 and I/O port 62 are supplied with the timing signal T, the scale mode M2, and the map mode return signal M4 from an OR circuit 66.

FIG. 11 shows details of the travel detection unit 22, and as described above, the matching circuit 68 compares the travel distance of the vehicle with a predetermined distance, for example, 50 m, and outputs the timing signal T. On the other hand, the direction detection section 70 detects the direction signal of the vehicle, and after converting it into a digital signal by the AD converter 72, the distance conversion circuit 74 converts the scale data A ₂ to
_A5 is calculated and supplied to the trajectory display circuit 22 as a running detection signal.

FIG. 12 shows an example of the operation section 28,
As mentioned above, the operating section 28 is provided with the keyboard 30 shown in FIG. 6, the input signal thereof is converted into a signal by the decoder 76, and the initial position data at the time the vehicle starts traveling is stored in the key memory 78.
Furthermore, the map/scale mode signal is outputted from the control key decoder 80 as signals M ₁ to _{M 4} .

The initial position signal of the key memory 78 is controlled to switch with the current position data K by the multiplexer 82,
The current location is stored in memory 84. Switching of the multiplexer 82 is performed by a signal _M4 from the map mode selection key 30f, and input switching is performed when the display mode is returned from the scale mode to the map mode.

The reset key 30b in FIG. 6 is used to reset travel trajectory data and other data, and sets the initial state of the device when a new vehicle starts traveling. Furthermore, the input _M1 acts as a trigger for supplying initial position data and other information at the start of travel selected by the key 30a to various parts.

In the present invention, the scale mode selection key 3
0d and scale instruction selection key 30e, the signal _M2 obtained by operating the former key is used to display the display mode in place of the map that has been displayed on the screen, and In the latter case, an arbitrary scale is selected in the scale mode, and after such a scale is selected, the device returns from the scale mode to the map display by outputting the signal _M4 from the map mode selection key 30f. can do.

FIG. 13 shows a preferred embodiment of the scale selection selection circuit 26, which includes a ring counter 86, which is reset by turning on the engine key 88, and then selected by the number of operations of the scale instruction selection key 30e. can be output as signals _A2 to _A5 .

FIG. 14 shows details of the scale mode display circuit 24 in the present invention, and this scale mode display circuit 24 is almost the same as the locus display circuit 20,
The cursor 10 shown in FIG.
Performs the writing and reading operations of b. The position of the cursor 10b is determined by signals A ₂ to _{A 5} from the scale selection circuit 26.
This signal is converted by the decoder 92 to write the cursor in the video RAM 90. The multiplexer 94 controls the switching between the cursor and the space, puts the cursor in a writeable state by applying a signal _M2 , and puts the cursor on the screen in a writable state by applying a signal _M4 for converting to map mode. erased and removes obstacles to normal map display.

The embodiment of the present invention has the above configuration, and its operation will be explained below.

When the vehicle starts running, the maximum scale map as shown in FIG. The display of the travel trajectory based on the travel detection signal from the lever travel detection unit 22 continues.

Next, when the scale mode selection key 30d of the keyboard 30 is operated during normal driving, the map on the screen up to that point is erased, and the scale scale 10a and cursor 10b shown in FIG. 7 are displayed on the screen instead. will be displayed.

Here, the driver can obtain a desired scale by operating the scale instruction selection key 30e a predetermined number of times, and in the embodiment, operating the key 30e once selects a scale of 1/8000, and pressing the key 30e respectively. 2
1/3 times and 3 times in a row, respectively.
4000, and 1/1000 scale can be obtained.

FIG. 15 shows a state in which the scale instruction selection key 30e is operated twice to move the cursor 10b to the 1/4000 scale; at this time, the scale selection circuit 26 supplies the corresponding scale signal to the map data selection circuit 16. Therefore, predetermined map data from the map RAM 14 is read out.

After the scale has been selected, when the map mode selection key 30f is pressed, a screen display showing a detailed part with the scale factor reduced to half is performed as shown in FIG.

[Effects of the Invention] As described above, according to the present invention, a change in scale is indicated by the scale mode displayed on the screen, that is, by a scale scale and a cursor, and accurate scale changes can be made quickly and without erroneous operations. It becomes possible to do so.

Furthermore, according to the device of the present invention that separately displays the scale mode, the scale can be quickly changed within the circuit, and there is no need for waiting time as in the past, so there is no delay even when the vehicle is running. A detailed map of the vicinity of the current location can be displayed on the screen very quickly, which is extremely useful for assisting driving.

[Brief explanation of drawings]

FIG. 1 is an overall block circuit diagram showing a preferred embodiment of the vehicle traveling trajectory display device according to the present invention, and FIG.
The figure is a plan view showing an example of the maximum scale map display, Figure 3 is an explanatory diagram showing the map in Figure 2 divided into nine areas, and Figure 4 is a different scale for each area in Figure 3. An explanatory diagram showing the allocation state of
6 is an explanatory diagram showing the keyboard of the operation unit in FIG. 1. FIG. 7 is an explanatory diagram showing an example of display of the selection mode in this embodiment. Fig. 8 is a block circuit diagram showing details of the map data selection circuit in Fig. 1, Fig. 9 is a block circuit diagram showing details of the map display circuit in Fig. 1, and Fig. 10 is a block circuit diagram showing details of the map display circuit in Fig. 1. 11 is a block circuit diagram showing details of the traveling detecting section 22 in FIG. 1; FIG. 12 is a block circuit diagram showing details of the operating section 28 in FIG. 1;
13 is a preferred circuit diagram of the scale selection circuit 26 in FIG. 1, FIG. 14 is a block circuit diagram showing details of the scale mode display circuit in FIG. 1, and FIG.
The figure is an explanatory diagram showing the movement state of the cursor in the scale mode, and FIG. 16 is an explanatory diagram showing an example of the map after the scale has been changed. 10...Display unit, 14...Map ROM, 16...
...Map data selection circuit, 18...Map display circuit,
20...Trajectory display circuit, 22...Traveling detection unit, 2
3...Scale mode display circuit, 26...Scale selection circuit, 28...Operation unit, 30...Keyboard.

Claims (1)

[Scope of Claims] 1. A map ROM 14 that stores a plurality of types of map data of different scales for the same area, and a map ROM 14 based on an input signal from an operation unit 28 that allows a map of a preset area to be selected. a map data selection circuit 16 that reads desired map data from;
Display unit 10 based on the read map data.
a map display circuit 18 that displays a map of the area selected by the vehicle; a travel detection section 22 that detects the traveling direction and distance of the vehicle; and a travel trajectory displayed on the display section 10 based on signals from the travel detection section 22. In a vehicle travel trajectory display device including a trajectory display circuit 20 that displays a map in a superimposed manner, the operating section 28 is provided with a scale mode selection key 30d and a scale instruction selection key 30e, and according to the operation of the scale mode selection key 30d. A scale mode display circuit 24 that displays a scale mode on the display section 10, and a map ROM that selects and instructs the displayed scale according to the operation of the scale instruction selection key 30d.
14, and a scale selection circuit 26 for reading map data of a selected scale from 14, and by selecting an arbitrary scale mode on the display screen, a map of the selected scale including the current location can be displayed. Features: Vehicle travel trajectory display device.