JP3860474B2 - In-vehicle / portable map display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an on-vehicle / portable map display device, and more particularly to an on-vehicle / portable map display device that can correct a current position on a road using road data.
[0002]
[Prior art]
The in-vehicle navigation system detects the current position by satellite navigation or self-contained navigation, draws a map image around the current position using map data for map drawing, and displays it on the liquid crystal display. .
By the way, if there is an error in the current position detected by satellite navigation or self-contained navigation, the current position mark is displayed at a position off the road on the map image, resulting in an unnatural display state. Therefore, in the conventional vehicle-mounted navigation device, after correcting the current position data on the road by map matching such as projection method and pattern matching method using the road data, the current position detected by satellite navigation or self-contained navigation, As shown in FIG. 8, the map image MI is drawn together with the current position mark VM and displayed on the screen. The current position mark VM is on a certain road RD of the map image MI.
[0003]
[Problems to be solved by the invention]
However, when the conventional in-vehicle navigation device is used for both portable use and when walking on a general road RDb for both vehicles and pedestrians as shown in FIG. If the current position P detected by navigation approaches the vehicle-only road RDa due to an error, the current position may be erroneously corrected on the vehicle-only road RDa by map matching (reference P in FIG. 9 ) . ´). The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an on-vehicle / portable map display device that can correctly perform map matching when used in both on-vehicle and portable.
[0004]
[Means for Solving the Problems]
In the on-vehicle / portable map display device according to claim 1 of the present invention, current position detecting means for detecting the current position, storage means for storing map drawing map data and map matching road data, road data Correction means for correcting the current position detected by the current position detection means by map matching, display means for displaying a map image together with the current position mark, and a map of a certain range including the current position using map data In the vehicle-mounted / portable map display device having a map display control unit that draws an image together with the current position mark and displays the image on the display unit, the vehicle mode display unit includes a use mode switching unit that switches the use mode between the in-vehicle mode and the portable mode. Two types of road data for vehicles and pedestrians are prepared for the road data stored in the storage means. For mounting mode, performs map matching by using the road data for a vehicle, use mode is the case of a cellular mode, it has to perform map matching by using the road data for pedestrians, it is characterized in.
According to a second aspect of the present invention, the usage mode switching means switches the usage mode in accordance with a usage mode switching operation by the user.
According to a third aspect of the present invention, the use mode switching means detects attachment / detachment of the device to / from the gantry fixed to the vehicle, and sets the use mode to the in-vehicle mode when the device is attached to the gantry and to the portable mode when the device is removed from the gantry. It is characterized by the fact that it has been switched.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, one embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram of a vehicle-mounted / portable navigation device according to the present invention.
Reference numeral 1 denotes an on-vehicle / portable navigation device as an example of an on-vehicle / portable map display device, which uses satellite navigation from a map memory unit that stores map data for map drawing at a predetermined scale and road data for map matching. Map data necessary for displaying the map image around the detected current position is read, and a map image of a certain range including the current position as a center is drawn together with the current position mark using the read map data and displayed on the screen. In this case, when using in-vehicle, the current position detected by satellite navigation is drawn on the screen together with the current position mark based on the current position data corrected on the road by map matching using road data for vehicles. When using with a mobile phone, the current position data detected by satellite navigation is corrected on the road by map matching using road data for pedestrians, and a map image is drawn with the current position mark on the screen based on the current position data. Can be made.
[0006]
Of the in-car / portable navigation device 1, 2 is a GPS receiver that periodically detects the current position and current direction by satellite navigation, 3 is a liquid crystal dot matrix display unit, and 4 is a map drawing map for each area. It is a map memory unit in which data, vehicle road data and pedestrian road data for performing map matching by area are stored. Here, the vehicle road data is road data of a road on which the vehicle can travel, and the pedestrian road data is road data of a walkable road. Reference numeral 5 denotes an operation unit that performs an operation of switching the use mode of the apparatus between the in-vehicle mode and the portable mode. 6 is a map display control unit having a microcomputer configuration. Among these, 7 is a use mode switching unit that performs a process for switching the use mode of each unit in accordance with a use mode switching operation in the operation unit 5, and 8 is detected by the GPS receiving unit 2. A map matching unit that corrects the current position on the road by map matching using the road data stored in the map memory unit 4, and when the use mode is the in-vehicle mode, the current position detected by the GPS receiving unit 2 is On the road by map matching using road data for vehicles, and when the use mode is the mobile mode, the current position detected by the GPS receiver 2 is displayed on the road by map matching using pedestrian road data. Correct it. Reference numeral 9 denotes an image storage area for one screen of the display unit 3, an image memory unit for storing a map image, and 10 a drawing unit. The map data stored in the map memory unit 4 is used to center the current position. A map image with the north facing upward is drawn in the image memory unit 9 and the current position mark is drawn at the center of the drawn map image in the direction corresponding to the current azimuth. Reference numeral 11 denotes a video conversion unit that reads an image stored in the image memory unit 9 and outputs it to the display unit 3 while converting it into a predetermined video signal to display a map image with a current position mark on the screen.
[0007]
The vehicle-mounted / portable navigation device 1 is formed in a rectangular box shape that can be held with one hand, and is mounted on a cradle 21 fixed to a dashboard 20 at the front of the vehicle interior of the vehicle as shown in FIG. It can be attached detachably.
[0008]
FIG. 3 is a flowchart showing map display control processing by the map display control unit 6, FIG. 4 is an explanatory diagram of map matching in the portable mode, and FIG. 5 is an explanatory diagram showing a display example on the display unit 3. The operation of the above-described embodiment will be described with reference to FIG. It is assumed that the current mode flag F (0: in-vehicle mode, 1: portable mode) stored in advance in a built-in memory (not shown) of the use mode switching unit 7 is 0 indicating the in-vehicle mode. In addition, the in-vehicle / portable navigation device 1 is supplied with predetermined DC power from an internal battery unit (not shown) to each unit.
[0009]
(1) On-vehicle mode When the user wants to use the on-vehicle / portable navigation device 1 in the on-vehicle mode, as shown in FIG. 2, the on-vehicle / portable navigation device 1 is mounted on the gantry 21 fixed to the dashboard 20 in the vehicle cabin. Put on. When the power key (not shown) of the in-car / portable navigation device 1 is pressed to turn on the power, the GPS receiver 2 periodically detects and outputs the current position and current direction by satellite navigation. On the other hand, when the power is turned on, the map display control unit 6 first checks the use mode switching unit 7 for F. Since it is 0 here, the map matching unit 8 and the drawing unit 10 are switched to the in-vehicle mode (steps S10 and S11 in FIG. 3). ). Subsequently, the map display control unit 6 inputs the current position and current direction from the GPS receiving unit 2, and the map matching unit 8 performs map matching using the vehicle road data around the current position stored in the map memory unit 4. The current position input from the GPS receiver 2 is corrected on the road on which the vehicle can travel (steps S12 and S13). Then, the drawing unit 10 uses the map data around the current position stored in the map memory unit 4 based on the current position data corrected by the map matching unit 8 to point north with the corrected current position as the center. The map image thus drawn is drawn in the image memory unit 9, and the current position mark for the in-vehicle mode is drawn at the center of the map image in the direction corresponding to the current direction input from the GPS receiving unit 2 (step S14). . The image drawn in the image memory unit 9 is converted into a predetermined video signal by the video conversion unit 11, and is output to the display unit 3 and displayed on the screen (step S15). As shown in FIG. 5A, the current position mark VM for in-vehicle mode on the road RDc on which the vehicle can travel is displayed at the center of the map image MI, as shown in FIG. It can be confirmed with.
[0010]
After step S15, the use mode switching unit 7 checks whether or not the use mode switching operation has been performed by the operation unit 5 (step S16), and since NO in this case, the map display control unit 6 confirms that F is 0 ( Step S17), returning to step S12, the same processing as described above is repeated. As a result, the current position mark VM relatively moves on the map image MI as the vehicle moves.
[0011]
(2) Mobile mode After that, when the user wants to take the in-vehicle / portable navigation device 1 out of the vehicle and use it in the mobile mode, the in-vehicle / portable navigation device 1 is removed from the gantry 21 and the operation unit 5 is used to switch the use mode. I do. Then, the use mode switching unit 7 determines YES in step S16, and inverts F to 1 (step S18). Then, the map matching unit 8 and the drawing unit 10 are switched to the portable mode (steps S10 and S19 in FIG. 3). Subsequently, the map display control unit 6 inputs the current position and the current direction from the GPS receiving unit 2, and the map matching unit 8 uses the pedestrian road data around the current position stored in the map memory unit 4 to perform map matching. Thus, the current position input from the GPS receiver 2 is corrected on a road on which a pedestrian can walk (steps S20 and S21). At this time, as shown in FIG. 4, when the user is walking on a vehicle and a pedestrian general road RDb near the vehicle dedicated road RDa, the current position P detected by satellite navigation is an error and the vehicle dedicated road RDa Even if the vehicle is closer, the current position is corrected correctly on the general road RDb because the pedestrian road data does not include the data of the vehicle exclusive road RDa (reference P ′ in FIG. 4).
[0012]
Thereafter, the drawing unit 10 uses the map data around the current position stored in the map memory unit 4 based on the current position data corrected by the map matching unit 8 to face north with the corrected current position as the center. The map image is drawn in the image memory unit 9, and the current position mark for the portable mode is drawn at the center of the map image in the direction corresponding to the current direction input from the GPS receiving unit 2 (step S22). ). The image drawn in the image memory unit 9 is converted into a predetermined video signal by the video conversion unit 11, and is output to the display unit 3 and displayed on the screen (step S15). As shown in FIG. 5 (2), the current position mark MM is displayed at the center of the map image MI on the screen. Since the current position mark MM is on the general road RDb, not the vehicle-only road RDa, You can check the location correctly on the map. Further, it can be easily seen that the current position mark MM is switched to the portable mode.
[0013]
After step S15, the use mode switching unit 7 checks whether or not the use mode switching operation has been performed by the operation unit 5 (step S16). Since NO in this case, the map display control unit 6 confirms that F is 1 ( Step S17), returning to step S20 , the same processing as described above is repeated. As a result, the current position mark MM relatively moves on the map image MI as the user walks.
[0014]
According to this embodiment, when the user switches to the in-vehicle mode, the current position is corrected by map matching using the vehicle road data. When the user switches to the mobile mode correctly, the current position is corrected by map matching using the pedestrian road data, so the current position mark on the map image is a road on which the pedestrian can walk Get on top correctly. Further, it can be easily understood from the shape of the current position mark whether the use mode is switched to the in-vehicle mode or the portable mode.
[0015]
In the above-described embodiment, the use mode is switched by the user performing a switching operation with the operation unit 5. However, the present invention is not limited to this, and the use mode is automatically linked to the attachment / detachment to the gantry 21. You may make it switch to.
For example, as shown in FIG. 6, a projection 23 is provided on the bottom 22 of the gantry 21A, and the projection is provided on the side of the in-car / portable navigation device 1A when the on-vehicle / portable navigation device 1A is mounted on the gantry 21A. 23 is provided with a switch portion (microswitch or the like) 12 that closes a contact point when an actuator (not shown) is pushed. The switch unit 12 outputs a switch signal that is L level when the contact is closed and H level when the contact is open. Then, the use mode switching unit 7A checks the level of the switch signal output from the switch unit 12 instead of checking the value of F in step S10 of FIG. 3, and the in-vehicle / portable navigation device 1A is mounted on the mount 21A. If the switch signal is at the L level, the process proceeds to step S11. Conversely, if the in-vehicle / portable portable navigation apparatus 1A is detached from the gantry 21A and is at the H level, the process proceeds to step S19. Similarly, instead of checking the value of F in step S17 in FIG. 3, the level of the switch signal is checked. If the vehicle-mounted / portable navigation device 1A is mounted on the gantry 21A and the switch signal is at the L level, the step is performed. On the contrary, if the vehicle-mounted / portable navigation device 1A is detached from the mount 21A and is at the H level, the process may proceed to step S20. According to the example of FIG. 6, even if the user does not particularly perform a use mode switching operation, if the vehicle-mounted / portable navigation device 1 </ b> A is mounted on the mount 21 </ b> A for use in a vehicle, it is detected that the device is mounted and automatically If the vehicle-mounted / portable navigation device 1A is removed from the gantry 21A for portable use, it is detected that it has been removed and automatically enters the mobile mode, saving labor.
[0016]
Further, for example, as shown in FIG. 7, male power terminals 24 and 25 capable of supplying power (+ B) from a car battery to the outside are provided on the bottom 22 of the gantry 21B, and the in-vehicle / portable navigation apparatus 1B. On the side, female-type power terminals 13 and 14 that are detachably fitted to the male-type power terminals 24 and 25 when the on-vehicle / portable navigation device 1B is mounted on the mount 21B are provided. Furthermore, in addition to the built-in battery unit (secondary battery type) 15 that supplies a predetermined DC voltage + V to each unit, the in-car / portable navigation device 1B receives a predetermined DC voltage + V from an external power source (+ B) from a car battery. The DC / DC converter unit 16 that is formed and supplied to each unit and the + B power supply to the female power supply terminals 13 and 14 are detected, and an external power supply detection signal of L level when power is supplied and H level when power is not supplied Is provided. Then, the use mode switching unit 7B checks the level of the external power supply detection signal output from the external power supply detection unit 17 instead of checking the value of F in step S10 of FIG. When the external power source detection signal is attached to the gantry 21B and the external power detection signal is at the L level, the process proceeds to step S11. Conversely, when the vehicle-mounted / portable navigation device 1B is detached from the gantry 21B and is at the H level, the process proceeds to step S19. To do. Similarly, instead of checking the value of F in step S17 in FIG. 3, the level of the external power supply detection signal is checked, and the in-vehicle / portable portable navigation device 1B is mounted on the gantry 21B and the external power supply detection signal is at the L level. In this case, the process proceeds to step S12. Conversely, when the vehicle-mounted / portable portable navigation apparatus 1B is detached from the gantry 21B and is at the H level, the process may proceed to step S20. In the example of FIG. 7 as well, even if the user does not perform any operation mode switching operation, if the vehicle-mounted / portable navigation device 1B is mounted on the gantry 21B for use in a vehicle, the mounting is detected and the vehicle-mounted mode is automatically detected. Thus, if the in-vehicle / portable navigation device 1B is removed from the gantry 21B for portable use, the removal is detected and the portable mode is automatically entered, saving labor.
[0017]
【The invention's effect】
According to the present invention, when the use mode is switched to the in-vehicle mode, the current position is corrected by map matching using the vehicle road data. Therefore, the current position mark on the map image is correctly displayed on the road where the vehicle can travel. take, on the contrary, when the switching to the mobile mode, because the current position by the map matching by using the road data for the pedestrian is modified, the current position mark on the map image is pedestrian properly ride on a possible walk road.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an in-vehicle / portable navigation device according to an embodiment of the present invention.
2 is an explanatory diagram of a method for installing the vehicle-mounted / portable navigation device of FIG. 1 on a vehicle. FIG.
FIG. 3 is a flowchart showing map display control processing by a map display control unit in FIG. 1;
FIG. 4 is an explanatory diagram of map matching processing in a portable mode by a map matching unit in FIG.
5 is an explanatory diagram showing a screen display example on the display unit in FIG. 1. FIG.
6 is a configuration diagram showing a modification of the vehicle-mounted / portable navigation device of FIG. 1; FIG.
7 is a block diagram showing another modification of the in-vehicle / portable navigation device of FIG. 1. FIG.
FIG. 8 is an explanatory diagram showing a screen display example in a conventional in-vehicle navigation device.
FIG. 9 is an explanatory diagram of problems of conventional map matching.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1A, 1B Car-mounted / portable navigation apparatus 2 GPS receiving part 3 Display part 4 Map memory part 5 Operation part 6 Map display control part 7, 7A, 7B Usage mode switching part 8 Map matching part 9 Image memory part 10 Drawing part DESCRIPTION OF SYMBOLS 11 Image | video conversion part 12 Switch part 13, 14 Female-type power supply terminal 15 Built-in battery part 16 DC / DC converter part 17 External power supply detection part 21, 21A, 21B Base 23 Protrusion 24, 25 Male type power supply terminal

Claims (3)

Current position detection means for detecting the current position, storage means for storing map drawing map data and map matching road data, and current position detected by the current position detection means by map matching using the road data Display means for displaying the map image together with the current position mark, display means for displaying the map image together with the current position mark, and a map display control for drawing a range of map images including the current position using the map data together with the current position mark and displaying on the display means A vehicle-mounted / portable map display device comprising:
With use mode switching means for switching the use mode between the in-vehicle mode and the mobile mode,
Prepare two types of road data to be stored in the storage means for vehicles and for pedestrians,
The correction means is that map matching is performed using road data for vehicles when the use mode is in-vehicle mode, and map matching is performed using road data for pedestrians when the use mode is portable mode. ,
An on-vehicle / portable map display device characterized by the above. The usage mode switching means switches the usage mode according to the usage mode switching operation by the user,
The on-vehicle / portable map display device according to claim 1. The use mode switching means detects the attachment / detachment of the device to / from the base fixed to the vehicle, and switches the use mode to the in-vehicle mode when attached to the base and the portable mode when detached from the base. ,
The on-vehicle / portable map display device according to claim 1.

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