JP2011013113A - Navigation system, on-vehicle unit, navigation method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a technique that a user who operates a navigation system achieving a navigation function in an on-vehicle unit by receiving data about a navigation such as a map image and the like from a data providing apparatus, easily predicts which direction the user chooses in order to return to the original route on the basis of a display screen of the on-vehicle unit, while the vehicle deviates from a navigation route, and a reroute processing is carried out by the data providing apparatus.SOLUTION: The on-vehicle unit brings a display means to display a guidance screen using one map image, when such the event cannot be detected that the current position deviates from the navigation route, and brings the display means to display a guidance screen using a plurality of map images stored in a memory means, when the event can be detected that the current position deviates from the route. Therefore, the user can check a wide range of map by using the plurality of images stored in the on-vehicle unit and easily predict which direction the user chooses in order to return to the original route.

Description

  The present invention relates to a technique for realizing a navigation function by providing a map image from a data providing device to an in-vehicle device mounted on a vehicle.

Using the global positioning system (GPS = Global Positioning System), position data indicating where the vehicle is currently on the earth is calculated, and the vehicle position mark is superimposed on the map image based on this position data. There is known a car navigation system that displays an object on a display of an in-vehicle device. FIG. 1 is a block diagram showing this car navigation system. The in-vehicle device is mounted on a vehicle such as the automobile 5. The position data is calculated based on radio waves emitted from three or more GPS satellites 4 received by the in-vehicle device. As shown in FIG. 2, the vehicle position mark a and the map image are superimposed by causing the vehicle position mark a to be fixedly displayed at a predetermined position of the map image displayed on the display and setting the vehicle position mark a as the current position. The map image is updated and displayed according to the position data that changes as the vehicle moves. That is, a display as if the host vehicle position mark a is moving is performed by updating and displaying the surrounding map according to the movement of the vehicle. For example, the map images in FIG. 2 are updated and displayed from G1 to G2, and from G2 to G3.

  In addition, with the improvement of the performance of mobile terminals such as mobile phones and PDAs (Personal Digital Assistants), navigation systems using GPS have also been realized in these mobile terminals. In such a navigation system, the functions are shared between the mobile terminal and the server that performs wireless communication with the mobile terminal. For function sharing, for example, the mobile terminal is in charge of the position data acquisition function, the destination setting function, the map matching function, the display function, etc., and the server is the map image storage function, route search function, and map image cutout I am in charge of functions. By performing the function sharing in this way, resources are distributed and shared to reduce costs.

  However, when a user carrying a terminal equipped with a navigation system gets on a vehicle equipped with a car navigation system, resources for realizing the navigation function are duplicated. As a system that eliminates resource duplication and effectively uses resources, a car navigation system that shares the data necessary for navigation while distributing the resources has been proposed for in-vehicle devices, portable terminals, and servers. Yes. For example, Patent Document 1 discloses a technique in which a vehicle-mounted device acquires a map image used for car navigation from a server by communication via a mobile phone.

  In such a system, data communication between the mobile terminal and the server, and data communication between the mobile terminal and the vehicle-mounted device are performed by wireless communication or wired communication, but their communication speed is not sufficient. The vehicle position mark a may not be superimposed on an appropriate position on the map image. For example, when the vehicle moves at a high speed of 40 km or more and the position data acquired from the GPS communication unit mounted on the vehicle changes quickly, the acquisition processing of the map image with a relatively large amount of data is performed at the communication speed. Due to a delay or the like, a map image appropriate for the vehicle position mark a cannot be superimposed and displayed on the display unit of the in-vehicle device. That is, the relationship between the map image displayed on the display unit of the in-vehicle device and the position of the vehicle position mark a is not consistent, and there is a possibility that the function as the car navigation system cannot be fully exhibited. Therefore, contrary to the conventional case where the vehicle position mark a indicating the current position is fixedly displayed and the map image around the current position is updated and displayed, the map image is fixedly displayed and maintained. However, it is conceivable to update and display the vehicle position mark a so as to move with respect to the map image. In this case, it is only necessary to update and display the map image only when the map on which the vehicle position mark a is displayed moves away from the map, and it is not necessary to update the map image frequently. That is, there is no significant delay in acquiring the map image in the in-vehicle device 1, and it is possible to match the positional relationship between the map image displayed on the in-vehicle device and the vehicle position mark a.

  In addition, it is possible to further match the map image by appropriately performing the update timing. Specifically, the in-vehicle device pre-fetches a plurality of clipped map images cut out from the map image around the route set based on the current position and the destination from the mobile terminal and the server, The image is stored in advance in the storage unit of the in-vehicle device. In other words, when the map image is updated, the next map image is stored in the storage unit of the vehicle-mounted device before the update, so that the update of the map image is not delayed, and the matching between them is performed. It can be done reliably.

Japanese Patent Laid-Open No. 2002-107169

  By the way, when the vehicle travels away from the set route, the map image displayed on the display unit of the vehicle-mounted device is not appropriate as a guide image to the destination. For this reason, data related to navigation is provided from the external data providing apparatus (in the above example, the mobile terminal and the server) to the in-vehicle device (in the above example, data is transmitted by wireless communication). In the navigation system, when the vehicle deviates from the route, a reroute process is performed in the data providing device, and a new route is acquired based on the current position and the destination. Then, a map image including a new route is provided to the in-vehicle device from the data providing device.

  However, the in-vehicle device has a plurality of reasons such as a reroute processing time in the data providing device and a communication delay between devices (for example, between the mobile terminal and the server or between the mobile terminal and the in-vehicle device). If the map image acquisition process takes time and the reroute process is performed, it takes time to display the map image including the new route. For this reason, the display unit cannot display a map image that guides the route from the current position of the vehicle to the destination. In other words, while performing the reroute process, the in-vehicle device displays an inappropriate map image before the reroute process on the display unit for users who want to travel off the route and return to the original route. As a result, the user may drive the vehicle increasingly off the original route.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique that makes it easy to predict which direction the user can return to the original route during the reroute process.

  In order to solve the above-mentioned problem, the invention of claim 1 is a navigation system comprising an in-vehicle device mounted on a vehicle and having a display means, and a data providing device for providing navigation-related data to the in-vehicle device. The data providing device includes a current position acquisition unit that acquires a current position of the vehicle, a first route acquisition unit that acquires a route to the destination of the vehicle, and the current position when the current position deviates from the route. Generate a plurality of map images used for guiding the route, the second route obtaining unit reacquiring a new route from the current position to the destination, and the size of the display unit of the in-vehicle device according to the screen. Map image generation means; and transmission means for sequentially transmitting the plurality of generated map images to the in-vehicle device, wherein the in-vehicle device includes the data providing device. Receiving means for sequentially receiving the plurality of map images from, storage means for storing the map images received in the receiving means, detecting means for detecting that the current position deviates from the route, and the current position When it is not detected that the vehicle has deviated from the route, a guide screen using one map image is displayed on the display unit, and when it is detected that the current position has deviated from the route, it is stored in the storage unit. Display control means for causing the display means to display a guidance screen using the plurality of map images.

  In the navigation system according to claim 1, when the display means detects that the current position deviates from the route, the display means stores a plurality of information stored in the storage means. The entire composite image of the map image is displayed on the display means.

  Further, the invention of claim 3 is the navigation system according to claim 2, wherein the in-vehicle device further includes an operation means for accepting a user operation, and the display means has the current position deviating from the route. Is detected, a part of the composite map image of the plurality of map images stored in the storage means is displayed on the display means, and is scrolled according to the user operation so that another one of the composite map images is displayed. The part is displayed on the display means.

  According to a fourth aspect of the present invention, in the navigation system according to any one of the first to third aspects, the in-vehicle device further includes an input unit that inputs a traveling speed of the vehicle, and the display unit When it is detected that the position deviates from the route, the number of map images used for the guidance screen is determined according to the traveling speed.

  In the navigation system according to any one of claims 1 to 3, the vehicle-mounted device further includes determination means for determining a traveling area in which the vehicle is traveling based on the map image. The display means determines the number of the map images used for the guidance screen based on a travel area when it is detected that the current position deviates from the route.

  Further, the invention according to claim 6 is the navigation system according to any one of claims 1 to 5, wherein the in-vehicle device includes a position receiving unit that receives the current position of the vehicle from the data providing device, and the vehicle. Deriving means for deriving the current position of the vehicle based on a signal from an external device provided, and the display control means, when the current position is not detected to deviate from the route, the data The vehicle position mark is displayed in the guidance screen based on the current position received from the providing device, and when it is detected that the current position deviates from the route, the vehicle position mark is detected based on the derived current position. The vehicle position mark is displayed on the guidance screen.

  According to a seventh aspect of the present invention, there is provided an in-vehicle device that is mounted on a vehicle and receives a navigation-related data from a data providing device and displays a guidance screen on a display means. When the position deviates from a predetermined route, a new route from the current position to the destination is re-acquired, and the route of the route is sized according to the screen of the display means from the data providing device. Receiving means for sequentially receiving a plurality of map images used for guidance; storage means for storing the map images received in the receiving means; and detecting means for detecting that the current position of the vehicle deviates from the route. If it is not detected that the current position of the vehicle deviates from the route, a guide screen using a single map image is displayed on the display means, and the current position is displayed. But and a display control means for displaying a guidance screen using a plurality of map images stored in the storage unit on the display means when it is detected that deviates from the route.

  The invention of claim 8 is a navigation method in a navigation system having an in-vehicle device mounted on a vehicle and having a display means, and a data providing device for providing navigation-related data to the in-vehicle device. A step of acquiring a current position of the vehicle; a step of acquiring a route to the destination of the vehicle by the data providing device; and a case where the current position deviates from the route of the data providing device. Re-acquiring a new route from the current position to the destination; and a plurality of data providing devices used for guiding the route having a size adapted to the screen of the display unit of the in-vehicle device. Generating a map image; and the data providing device sequentially sends the generated map images to the in-vehicle device. A step of sequentially receiving the plurality of map images from the data providing device, a step of storing the received map image in a storage unit, and A step of detecting that the current position has deviated from the route; and if the in-vehicle device does not detect that the current position has deviated from the route, a guidance screen using one map image is displayed on the display means. A step of displaying, and a step of displaying on the display means a guidance screen using a plurality of map images stored in the storage means when the in-vehicle device detects that the current position deviates from the route; Execute.

  The invention of claim 9 is a program that is mounted on a vehicle and that can be executed by a computer included in an in-vehicle device that receives data related to navigation from a data providing device and displays a guidance screen on a display means, The data providing device re-acquires a new route from the current position to the destination when the current position of the vehicle deviates from a predetermined route, and execution of the program by the computer A step of sequentially receiving a plurality of map images used for guiding the route having a size adapted to the screen of the display means from the data providing device; and a step of storing the received map images in a storage means; Detecting that the current position of the vehicle deviates from the route; and the current position of the vehicle is the route. If it is not detected that the vehicle has deviated from the route, a step of displaying a guidance screen using one map image on the display unit, and if the current position is deviated from the route, is stored in the storage unit. And displaying a guidance screen using a plurality of map images on the display means.

  According to the first to eighth aspects of the invention, the in-vehicle device uses only a plurality of map images stored in the storage means while detecting that the current position has deviated from the route and performing route reacquisition. Since the guidance screen is displayed on the display means, the user can confirm the guidance screen showing a relatively wide area map, and can easily predict which direction the user can return to the route.

  In particular, according to the invention of claim 2, the in-vehicle device uses only a plurality of map images stored in the storage means while detecting that the current position has deviated from the route and performing route reacquisition. Since the displayed guidance screen is displayed on the display means, the user can check at a glance the entire composite map image of a plurality of map images, and can easily predict which direction the user can return to the route.

  In particular, according to the invention of claim 3, the in-vehicle device detects that the current position has deviated from the route, and combines only a plurality of map images stored in the storage means while performing route reacquisition. Since a part of the map image is displayed on the display means, and the other part of the composite map image is displayed on the display means by scrolling according to the user operation, the user can check the guidance screen showing a relatively wide area map. It is easy to predict which direction you can return to the route.

  In particular, according to the invention of claim 4, the vehicle-mounted device uses only a plurality of map images stored in the storage means while detecting that the current position has deviated from the route and performing route reacquisition. The guidance screen is displayed on the display means, and the number of map images used for the guidance screen is determined according to the traveling speed, so the amount of information necessary for the guidance screen is adjusted to an appropriate one, and the user is directed to which direction It is easy to predict whether you can return to the route.

  In particular, according to the invention of claim 5, the vehicle-mounted device uses only a plurality of map images stored in the storage means while detecting that the current position has deviated from the route and performing route reacquisition. The display screen is displayed on the display means, and the number of map images used for the guidance screen is determined according to the travel area, so that the necessary amount of information is adjusted according to the characteristics of the travel area, and the user It is easy to predict in which direction you can return to the route.

  In particular, according to the invention of claim 6, the in-vehicle device is detected based on a signal from an external device provided in the vehicle while detecting that the current position has deviated from the route and performing route reacquisition. Since the vehicle position mark is updated and displayed in the guidance screen based on the current position derived by the means, the user can recognize where he / she is traveling without receiving the current position data from the data providing apparatus.

FIG. 1 is a diagram illustrating the configuration of a navigation system. FIG. 2 is a diagram illustrating the configuration of the navigation system. FIG. 3 is a diagram showing a display map image in the navigation system. FIG. 4 is a system block diagram of the in-vehicle device. FIG. 5 is a system block diagram of the mobile terminal. FIG. 6 is a system block diagram of the server. FIG. 7 is a flowchart showing the operation of the navigation system. FIG. 8 is a diagram showing a route vicinity map image in the navigation system. FIG. 9 is a flowchart showing the operation of the navigation system. FIG. 10 is a diagram showing a route vicinity map image in the navigation system. FIG. 11 is a flowchart showing the operation of the navigation system. FIG. 12 is a diagram showing a display map image in the navigation system. FIG. 13 is a flowchart showing the operation of the navigation system. FIG. 14 is a diagram showing a display map image in the navigation system. FIG. 15 is a flowchart showing the operation of the navigation system. FIG. 16 is a flowchart showing the operation of the navigation system. FIG. 17 is a diagram showing a display map image in the navigation system. FIG. 18 is a diagram illustrating the configuration of the navigation system.

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

<Embodiment>
<1. First Embodiment>
<1.1 Navigation system configuration>
FIG. 3 is a configuration diagram illustrating the navigation system 100 according to the first embodiment. The navigation system 100 includes an in-vehicle device 1 mounted on a vehicle such as an automobile 5, a mobile terminal 2 that is a data providing device, and a server 3. The in-vehicle device 1 transmits and receives data related to navigation by performing short-range wireless communication with the mobile terminal 2 based on, for example, the Bluetooth (registered trademark) standard. For communication, wired communication such as USB connection may be used. The mobile terminal 2 performs short-range wireless communication with the in-vehicle device 1 to transmit / receive data related to navigation, etc., and performs wireless communication with the GPS satellite 4 to receive data for measuring the current position. Furthermore, the mobile terminal 2 performs wireless communication with the server 3 to transmit / receive data related to navigation. The GPS satellite 4 wirelessly communicates with the portable terminal 2 and transmits data for measuring the current position. The server 3 performs wireless communication with the mobile terminal 2 to transmit / receive data related to navigation. In the navigation system 100, the in-vehicle device 1, the mobile terminal 2, and the server 3 realize a navigation function to be described later based on navigation-related data acquired through such communication.

In the navigation system 100 of the present embodiment, the mobile terminal 2 and the server 3 operate in cooperation to provide navigation-related data to the in-vehicle device 1. Therefore, it can be said that the combination of the portable terminal 2 and the server 3 is a data providing apparatus that provides data related to navigation to the in-vehicle device 1.
(System block diagram)
(In-vehicle device)
FIG. 4 is a system block diagram of the in-vehicle device 1. The in-vehicle device 1 includes a control unit 10 that performs various controls in order to realize a navigation function or a music playback function, a map image that serves as a guidance screen that highlights a route to a destination and guides the destination. And a display / operation unit 11 (for example, a touch panel) for receiving user operations, an operation unit 12 for receiving other user operations, a sound output unit 13 for outputting music, sound effects during operation, and data necessary for control A short-range wireless communication unit 15 capable of communicating with a communication partner within a predetermined distance, for example, within a radius of 10 to 100 m in accordance with the Bluetooth (registered trademark) standard, and an input / output unit 16 (I / F). The input / output unit 16 includes a rotation detection unit 6 (for example, a gyro sensor) that detects the rotation of a vehicle connected to the in-vehicle network 8 (for example, a control area network), and a vehicle speed detection unit 7 that detects a moving speed of the vehicle. A signal indicating a detection value from (for example, a vehicle speed sensor) or the like is received via the in-vehicle network. The rotation detection unit 6 and the vehicle speed detection unit 7 are external devices provided separately from the vehicle-mounted device 1 in the vehicle.

  When realizing the navigation function, the guidance screen is displayed on the display / operation unit 11. In addition, data related to navigation such as map images and position data provided from the mobile terminal 2 is received by the short-range wireless communication unit 15, and data related to navigation transmitted from the in-vehicle device 1 to the mobile terminal 2 is also included in the short-range wireless communication unit 15. Send by.

  The control unit 10 is constituted by a microcomputer provided with a CPU and the like. The control unit 10 realizes a function related to the navigation system when the CPU performs arithmetic processing according to a program stored in a predetermined memory (for example, ROM). This program is stored in advance in the storage unit 14 or the like, but may be updated by communication with an external server, reading of a recording medium storing the program, or the like.

  The main navigation functions realized by the control unit 10 include the following (A) to (G).

  (A) Superimposition in which the control unit 10 superimposes and displays the vehicle position mark a on the display / operation unit 11 at an appropriate position of the map image based on the map image and the position data received by the short-range wireless communication unit 15. Display function.

  (B) An image synthesis function in which the control unit 10 synthesizes a plurality of map images stored in the storage unit 14.

  (C) The vehicle position mark update function in which the control unit 10 updates and displays the display position of the vehicle position mark a on the display / operation unit 11 based on the coordinate data received at a predetermined cycle by the short-range wireless communication unit 15. .

  (D) An autonomous navigation display function in which the control unit 10 updates and displays the display position of the host vehicle position mark a based on the detection values from the rotation detection unit 6 and the vehicle speed detection unit 7 received by the input / output unit 16.

  (E) A map image storage function in which the control unit 10 performs control to maintain a predetermined number of clipped map images received from the mobile terminal 2 and store the same in the storage unit 14.

  (F) When the coordinate data is included in the predetermined update position in the cut-out map image displayed on the display / operation unit 11 by the control unit 10, the cut-out map image to be displayed next is updated. Map image update function to be displayed.

  (G) A new guidance end determination function that terminates navigation when the control unit 10 includes coordinate data at the destination in the cut-out map image displayed on the display / operation unit 11.

  Details of these functions will be described later.

Moreover, the control part 10 controls each part of the vehicle equipment 1 in order to perform a step required in order to implement | achieve the navigation function mentioned later.
(Mobile device)
FIG. 5 is a system block diagram of the mobile terminal 2. The mobile terminal 2 includes a control unit 20 that performs various controls in order to realize a call function, a navigation function, and the like, a display unit 21 that displays a telephone number when making a call, an operation unit 22 that receives a user operation, A sound output unit 23 for outputting the voice of the other party during a call, a sound effect during operation, or a ring tone when receiving an e-mail; a sound input unit 24 for inputting a voice spoken with the other party during a call; A storage unit 25 (for example, Flash Memory) that stores data necessary for control, a call communication unit 26 that transmits and receives call data to communicate with other portable terminals through wireless communication, and a signal transmitted from the GPS satellite 4 are received. A GPS communication unit 27, a communication unit 28 that transmits and receives data related to the server and navigation by wireless communication, and a predetermined distance, for example, a radius of 10-10 A short-range wireless communication unit 29 capable of data communication with a communication partner within 0 m according to the Bluetooth (registered trademark) standard is provided.

  In a scene where the navigation system 100 of the present embodiment functions, the portable terminal 2 is carried by the user (vehicle driver) and is therefore located in the vehicle. Therefore, the GPS communication unit 27 acquires current position data that is current position data of the vehicle.

  The control unit 20 is configured by a microcomputer provided with a CPU and the like. The control unit 20 realizes a navigation-related function by the CPU performing arithmetic processing according to a program stored in a predetermined memory (for example, ROM). This program is stored in advance in the storage unit 25 or the like, but may be updated by communication with an external server, reading of a recording medium storing the program, or the like.

  The main navigation functions realized by the control unit 20 include the following (H) to (K).

  (H) A cut-out map image generation function that cuts out a map image that can be displayed on the display / operation unit 11 of the vehicle-mounted device 1 from the route periphery map image received from the server 3 (hereinafter referred to as a cut-out map image).

  (I) A coordinate calculation function for calculating where in the coordinates of the map image the vehicle position mark a is located based on the position data received by the GPS communication unit 27 by the control unit 20.

  (J) A map matching function that corrects the coordinate data so that the control unit 20 can superimpose the map image at an appropriate position on the map image.

  (K) A route departure determination function in which the control unit 20 determines whether the coordinate data has deviated from the route included in the map image.

  Details of these functions will be described later.

In addition, the control unit 20 controls each unit of the mobile terminal 2 in order to execute steps necessary for realizing a navigation function described later.
(server)
FIG. 6 is a system block diagram of the server 3. The server 3 controls the control unit 30 that performs various controls in order to realize a content providing function such as navigation information, and performs administrator operations to perform settings necessary for control or maintenance of control programs and control data. Operation unit 31 that accepts, display unit 32 that displays a setting screen or a maintenance screen, a storage unit 33 that accumulates content such as a map image, and a communication unit that transmits and receives data related to navigation with the portable terminal 2 by wireless communication 34 is provided.

  The control unit 30 is configured by a microcomputer provided with a CPU and the like. The control unit 30 realizes a navigation-related function when the CPU performs arithmetic processing according to a program stored in a predetermined memory (ROM).

  The main navigation functions realized by the control unit 30 include the following (L) to (M).

  (L) A route creation function for creating a route based on the current position data and destination data of the vehicle (including a function for creating a new route when the vehicle deviates from the route).

  (M) A route surrounding image creation function for cutting out a map image around the created route from the storage unit 33.

  Details of these functions will be described later.

  Further, the control unit 30 controls each unit of the server 3 in order to execute steps necessary for realizing a navigation function described later.

<1.2 Navigation system control processing>
<Mobile linkage control processing>
(In-vehicle device)
The control process which the control part 10 with which the vehicle equipment 1 is provided performs is demonstrated. When the ignition key of the vehicle is operated by the user and the ACC (accessory) is turned on by the user, the control unit 10 is supplied with electric power from the power source (battery), and can execute various control processes. When the control unit 10 is in a state where various control processes can be executed, the control process corresponding to the content operated by the user in the display / operation unit 11 or the operation unit 12 is executed. For example, the in-vehicle device 1 displays a menu for allowing the user to select various functions such as a navigation function, a music playback function, or a mobile link function on the display / operation unit 11, and the user can When the cooperation function is selected, the control unit 10 executes a control process for realizing the mobile cooperation function.

  In order to realize the mobile link function, it is necessary to execute pairing control in order to establish communication with the mobile terminal 2 or the server 3. Here, in the pairing control, the control unit 20 of the mobile terminal 2 controls the short-range wireless communication unit 21 to establish wireless communication with the short-range wireless communication unit 15 of the in-vehicle device 1. Control that establishes wireless communication with the communication unit 34 of the server 3 by controlling the communication unit 28.

The control unit 10 of the in-vehicle device 1 displays a plurality of content providing service menus on the display / operation unit 11 after the pairing control is established. For example, the menu includes a navigation providing service, a music providing service, or a news providing service. When the navigation service is selected, the control unit 10 of the in-vehicle device 1 executes the selected navigation system in cooperation with the mobile terminal 2 and the server 3.
(Mobile device)
A control process executed by the control unit 20 included in the mobile terminal 2 will be described. When the power button provided on the mobile terminal is turned on by the user, the control unit 20 is supplied with power from the power source (battery) and can execute various control processes. When the control unit 20 is in a state where various control processes can be executed, the control process corresponding to the content of the operation of the operation unit 22 by the user is executed. For example, the mobile terminal 2 is configured such that the user can operate various functions such as a call function, an internet browsing function, or a mobile link function in the operation unit 22. When the user selects the mobile link function using the operation unit 22, the control unit 20 executes a pairing control process in order to realize the mobile link function.

When the navigation service is selected in the in-vehicle device 1 after establishing the pairing control, the control unit 20 executes the navigation providing service in cooperation with the in-vehicle device 1 and the server 3.
(server)
A control process executed by the control unit 30 included in the server 3 will be described. When the power button provided on the server 3 is operated and turned on by the administrator, the control unit 30 is supplied with power from the power source (commercial power source) and can execute various control processes. When the control unit 30 is in a state where various control processes can be executed, the control process or the content provision control process corresponding to the content of the operation of the operation unit 31 by the administrator is executed. That is, when execution of content provision control processing is selected by the operation of the operation unit 31 by the administrator, the control unit 30 provides content such as a map image in response to a request from a client such as the in-vehicle device 1 or the portable terminal 2. To do. When there is a pairing control execution request from the mobile terminal 2 as a client to realize the mobile link function, the pairing control is executed in response to this request.

  When the navigation service is selected in the in-vehicle device 1 after establishing the pairing control, the control unit 30 executes the navigation providing service in cooperation with the portable terminal 2 and the server 3.

  Hereinafter, control of the vehicle-mounted device 1, the portable terminal 2, and the server 3 when the navigation providing service is selected by the user from the content providing service menu displayed on the display / operation unit 11 of the vehicle-mounted device 1 will be described. .

<1.2.1 Navigation control processing>
In FIG. 7, a navigation providing service executed by the navigation system 100 will be described.

  In S <b> 100, the control unit 10 displays a destination setting screen on the display / operation unit 11. The destination setting screen is a screen on which the user can enter a location where he / she wants to go. When the destination is input by the user on this screen and the enter button is operated, the in-vehicle device 1 transmits the destination data to the mobile terminal 2.

  In S <b> 200, the control unit 20 of the mobile terminal 2 transmits the destination data received from the in-vehicle device 1 to the server 3.

  In step S <b> 201, the control unit 20 transmits the position data received and measured from the GPS communication unit 27 included in the mobile terminal 2 to the server 3.

<Route creation process>
In S300, the control unit 30 of the server 3 uses the route creation function to create a travel route based on the received destination data, position data, and map image stored in the storage unit 33 (map image base). For example, the route is created by referring to the characteristics associated with the road existing from the current position of the map image to the destination and combining the roads according to the concept of each route.

<Route surrounding image creation processing>
In S <b> 301, the control unit 30 of the server 3 cuts out the map image around the created route from the storage unit 33 by the route surrounding image creation function. For example, a route periphery map image 1000 shown in FIG.

  In S <b> 302, the control unit 30 of the server 3 transmits the extracted route vicinity map image 1000 to the mobile terminal 2, and proceeds to C. When the process shifts to C, the processes after S303 shown in the flowchart of FIG. 9 are executed.

<Map image cutout processing>
In S202, the control unit 20 of the mobile terminal 2 causes the map image generation function to store the received route periphery map image 1000 in the storage unit 25, and from the stored route periphery map image, the display / operation unit of the in-vehicle device 1 11 is generated by cutting out a map image having a size suitable for display on the screen 11. The reason why such processing is performed is that the route periphery map image 1000 includes the entire route, so that the size is too large to be displayed on the display / operation unit 11 of the in-vehicle device 1. By this process, a plurality of map images having different ranges along the route are cut out.

  For example, the control unit 20 cuts out the map images M1 to M19 in the route periphery map image 1000 in FIG. 8 and allows the display / operation unit 11 of the in-vehicle device 1 to display the map images.

  A method for cutting out the cut-out map image will be specifically described. The control unit 20 executes the following process. The control unit 20 cuts out the first cut-out map image M1 from the route surrounding map image 1000 so as to satisfy the following condition. Include the start position on the route (first condition). The amount of map image to be cut out is set to a data amount suitable for displaying on the display / operation unit 11 of the in-vehicle device 1 (second condition). The map direction is such that the north is upward (third condition). The start position is set below the cut-out map image M1 (fourth condition). The start position is set to approximately the center in the left-right direction of the cut-out map image M1 (fifth condition).

  Next, the control unit 20 cuts out the next cut-out map image M2 from the route surrounding map image 1000 so as to satisfy the following conditions. A position where a route overlaps with an update area c (described later) around the previous cut-out map image M1 is set as a start position, and this start position is included (first condition). The map image amount is set to a data amount suitable for displaying on the display / operation unit 11 of the in-vehicle device 1 (second condition). The map direction is such that the north is upward (third condition). The start position is the vertical edge of the cut-out map image when the update area is vertical, and the horizontal edge when the update area is horizontal (fourth condition). In the fourth condition, when the start position is the vertical edge of the cut-out map image, the start position is set to the substantially vertical center, and when the start position is the horizontal edge of the cut-out map image, the start position Is approximately the center in the left-right direction (fifth condition).

  Such processing is repeated up to the last cut-out map image M19 including the destination.

  That is, when the map image is updated in the display / operation unit 11 of the vehicle-mounted device 1, the control unit 20 always has the vehicle position mark a at the substantially vertical center of the vertical edge of the map image or the horizontal edge. A process of cutting out a map image that is located at approximately the center in the left-right direction and that can be displayed in a north-up direction with the top of the map direction being north is executed.

  Thus, when the map image is updated, the vehicle position mark a is always displayed at either the vertical center of the vertical edge of the map image or the approximate horizontal center of the horizontal edge, and Since the map image display is always north on the map direction, the vehicle position mark a is displayed at a fixed position in the map image when the map image is updated, and the user does not lose sight of the vehicle position mark a. A navigation system can be used.

  In S204, the control unit 20 of the mobile terminal 2 transmits a predetermined number, for example, four clipped map images. Note that unique address data is assigned to the cut-out map image on the vertical axis (X) and the horizontal axis (Y). This address data functions at the time of image composition processing described later.

<Coordinate data calculation process>
In S203, the control unit 20 of the portable terminal 2 receives the position data of the vehicle at that time based on the signal transmitted from the GPS satellite 4 by the GPS communication unit 27 by the coordinate data calculation function. Based on this position data, the control unit 20 of the portable terminal 2 calculates coordinate data indicating the position of the vehicle position mark a in the extracted map image. The coordinate data is composed of numerical values on the vertical axis (X) and the horizontal axis (Y), for example, X: Y = 350: 20.

<Map matching process>
Further, the control unit 20 of the portable terminal 2 receives data (data indicating speed, gear speed, direction, etc.) from various sensors provided in the vehicle from the in-vehicle device 1 by the map matching function, and these data and coordinate data. Based on the map matching. Map matching is to determine whether there is any similarity between the vehicle travel locus calculated based on the detection data of various sensors and the road line in the cut-out map image. This means that the position is “true”, the difference coefficient k between the coordinate set to “true” and the coordinate data is obtained, and this is used as a correction term to multiply the coordinate data calculated by the coordinate data calculation process by the correction term.

  In S205, the control unit 20 of the mobile terminal 2 transmits the coordinate data after the map matching to the in-vehicle device 1, and proceeds to B. When the process moves to B, the process from S206 shown in the flowchart of FIG. 9 is executed. The in-vehicle device 1 stores the extracted map image and the coordinate data in the storage unit 14.

<Superimposed display processing>
In S101, the control unit 10 of the in-vehicle device 1 displays the received clipped map image and the own vehicle position mark a based on the coordinate data on the display / operation unit 11 by the superimposed display function, and shifts to A. . When the process moves to A, the processes after S102 shown in the flowchart of FIG. 9 are executed. The superimposed display means that the cut-out map image M1 and the vehicle position mark a are superimposed on a point determined by the coordinate data on the map image M1.

  Next, in S206 in the flowchart of FIG. 9, the control unit 20 of the portable terminal 2 calculates coordinate data in the same manner as the process in S203.

<Route deviation judgment processing>
In S207, the control unit 20 of the mobile terminal 2 deviates from the route included in the extracted map images M1 to M19 or the route surrounding map image 1000 in which the calculated coordinate data is stored in the storage unit 14 by the route departure determination function. Judge whether or not. Specifically, for example, the coordinate data deviates from the route based on the fact that the coordinate data has departed from the route to the extent that it cannot be corrected by map matching, or the traveling direction of the vehicle is different from the traveling direction of the route. Judge that For example, as shown in FIG. 10, it is determined whether or not the vehicle position mark a displayed on M5 has deviated from the route b. When the control unit 20 determines that the coordinate data deviates from the route, the control unit 20 proceeds to S208 (Yes in S207). If it is not determined that the coordinate data deviates from the route, the process proceeds to S209 (No in S209).

  In S208, the control unit 20 of the mobile terminal 2 transmits a deviation notification to the in-vehicle device 1 and the server 3, and proceeds to α. When the process proceeds to α, the processes in and after S201 shown in the flowchart of FIG. 7 are executed. That is, this process means a reroute process executed by the mobile terminal 2. If the control unit 20 does not determine that the coordinate data deviates from the route, the control unit 20 proceeds to S209 (No in S207).

  In S102, the control unit 10 of the in-vehicle device 1 determines whether or not a deviation notification has been received, and when determining that it has been received, proceeds to S103 (YES in S102). If control unit 10 does not determine that the deviation notification has been received, control unit 10 proceeds to S104 (No in S102). The control unit 10 detects the departure by receiving the departure notification. Note that the control unit 10 may execute a route departure determination process performed by the control unit 10 of the mobile terminal 2.

  In S303, the control unit 30 of the server 3 determines whether or not a deviation notification has been received. If it is determined that it has been received, the control unit 30 proceeds to β (Yes in S303). If it transfers to (beta), the process after S300 shown in the flowchart FIG. 7 will be performed. That is, this process means a reroute process executed by the server 3. If control unit 30 does not determine that a deviation notification has been received, control unit 30 proceeds to S304 (No in S303).

  In S303, the control unit 30 of the server 3 determines whether or not the termination condition of the server 3 is satisfied. Whether or not the termination condition of the server 3 is satisfied means an instruction to stop a navigation function, which is a server content providing service, or stop of power supply. If it is determined that the termination condition is satisfied, the control is terminated (Yes in S304). If it is determined that the end condition is not satisfied, the control after S303 is repeated (No in S304).

<Image composition processing>
In S103, the control unit 10 of the in-vehicle device 1 executes an image composition process by the image composition function. The image composition process will be described based on the flowchart of FIG.

  In S <b> 110, the control unit 10 of the in-vehicle device 1 displays a guidance screen using a plurality of map images stored in the storage unit 14 on the display / operation unit 11. That is, the control unit 10 synthesizes a predetermined number of map images stored in the storage unit 14, for example, four map images out of four. An enlarged view when the vehicle position mark a deviates from the route b in the map image of M5 shown in FIG. 10 is shown in G4 of FIG. If the control unit 10 determines that the situation is as indicated by G4 in FIG. 10, the map unit synthesizes four map images from M5 to M8 as shown by G5 in FIG. The entire image is resized to a size that can be displayed on the display / operation unit 11 of the in-vehicle device 1. The map image combining process is executed based on unique address data assigned to the map image. To describe this composition processing in detail, a plurality of unique addresses assigned to the X-axis and the Y-axis of the cut-out map image are given to all the cut-out map images, and the adjacent cut-out map images are consecutive. The same address data is assigned to the address of the area to be processed. The control unit 10 connects points at which the unique addresses assigned to the cut-out map image match each other. By performing this operation for all of the plurality of extracted map images, the synthesis process is realized. Further, the control unit 10 processes the image by, for example, blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G5 in FIG.

  In S <b> 111, the control unit 10 of the in-vehicle device 1 displays the resized composite map image on the display / operation unit 11.

  Regarding the image composition processing, in other words, in the image composition processing, a plurality of extracted map images stored in the storage unit 14 are combined and combined so that the routes included in the extracted map image are continuous, and the combined image is also displayed. The map image is reduced so that the entire image can be displayed on the display / operation unit 11 of the vehicle-mounted device. A process of displaying (for example, black) is executed.

<Autonomous navigation display processing>
The control unit 10 of the in-vehicle device 1 appropriately displays the vehicle position mark a by the autonomous navigation display function without being based on the data received from the portable terminal 2 and the server 3 that are data providing devices. The autonomous navigation display function will be described. Since the control unit 10 executes the reroute process in cooperation with the portable terminal 2 and the server 3 which are data providing apparatuses, the data providing apparatus preferentially executes the process. Periodic reception of the coordinate data of the vehicle position mark from the terminal 2 is delayed. Therefore, the control unit 10 determines the current map image based on the detection values from the rotation detection unit 6 and the vehicle speed detection unit 7 received via the in-vehicle network 8 and the coordinate data immediately before the reception process is stopped. The coordinate data of the vehicle position mark a at is predicted.

  In S113, the control unit 10 calculates the degree of movement based on the vehicle speed data from the coordinate data immediately before reception, and calculates how much the direction is changed based on the rotation data. Predict. Therefore, the control unit 10 can update and display the vehicle position mark a in the composite map image even if the reception processing of the coordinate data from the portable terminal 2 is delayed, and the user can recognize the area where the vehicle is traveling. .

  In contrast to the method of actively displaying the vehicle position mark a based on GPS (hereinafter referred to as active navigation display), this method of displaying autonomously based on vehicle travel data is referred to as autonomous navigation display.

  In S <b> 114, the control unit 10 of the in-vehicle device 1 determines whether or not predetermined data has been received from the mobile terminal 2. If it is not determined that the predetermined data has been received, the process returns to S113 and the subsequent processing is repeated (No in S114). If it is determined that the predetermined data has been received, the synthesis process routine is terminated, and the flow returns to the flowchart of FIG. When the process shifts to γ, the processing after S101 shown in the flowchart of FIG. 7 is executed. That is, this process is a process in the in-vehicle device 1 after the mobile terminal 2 that is a data providing apparatus and the server 3 cooperate to execute the reroute process.

<Vehicle position mark update process>
The control unit 10 of the vehicle-mounted device 1 updates and displays the vehicle position mark a on the display / operation unit 11 based on the coordinate data received from the mobile terminal 2 at a predetermined cycle by the vehicle position mark update function.

  In S209, the coordinate data calculated in S206 is transmitted to the in-vehicle device 1 at a predetermined cycle, for example, a 3-second cycle.

  In S104, the control unit 10 of the vehicle-mounted device 1 in the map image displayed on the display / operation unit 11, every time coordinate data is received from the mobile terminal 2, the vehicle position mark is set to a point determined by the coordinate data in the map image. a is updated and displayed. At this time, the display of the map image on the display / operation unit 11 is maintained. That is, the control unit 10 updates and displays the vehicle position mark a so as to move relative to the map image while displaying and maintaining the map image fixedly.

<Map image storage processing>
The control unit 10 of the in-vehicle device 1 stores a predetermined number of extracted map images in the storage unit 14 by the map image storage function. The maximum number of sheets that the control unit 10 stores the extracted map image in the storage unit 14 is determined, for example, four. The four cut map images stored in the storage unit 14 by the control unit 10 are, for example, in the order in which the cut map images M1 to M19 illustrated in FIG. 8 are arranged in ascending order.

  Accordingly, initially, the cut-out map images M1 to M4 are stored in the storage unit 14, and the cut-out map image M1 currently displayed on the display / operation unit 11 by the control unit 10 is used as the next cut-out map. When updating to the image M2, the cut-out map image M1 before the update is deleted from the storage unit 14, the mobile terminal 2 is requested to transmit a new cut-out map image M5, and the cut-out received from the mobile terminal 2 The map image M5 is stored in the storage unit 14. In other words, the storage control performed by the control unit 10 is FIFO (First In First Out) control, and the maximum number of clipped map images stored in the storage unit 14 is set to four, and the latest clipped map image is stored after the storage. This is a control to delete the old cut map image.

  When the control unit 20 of the portable terminal 2 receives the cut-out map image transmission request from the in-vehicle device 1, the control unit 20 transmits the cut-out map image required next by the in-vehicle device 1. That is, in this example, the cut-out map image of M5 whose order is continuous with M4 is transmitted.

  By executing such a map image storage process, before updating the clipped map image in the display / operation unit 11 of the vehicle-mounted device 1, the clipped map image to be displayed next is stored in the storage unit 14 of the vehicle-mounted device 1. The update display delay of the map image does not occur. Further, when the vehicle position mark a deviates from the route b, it is possible to execute the image composition process, and by appropriately deleting the unnecessary cut image, the capacity of the storage unit 14 can be appropriately maintained and It is possible to provide storage capacity for control.

  This map image storing process will be described with reference to the flowchart of FIG.

  In S105, the control unit 10 of the in-vehicle device 1 determines whether or not the number of clipped map images stored in the storage unit 14 is less than a predetermined number. For example, the predetermined number is four. When it is determined that there are fewer than four sheets, the process proceeds to S106 (Yes in S105). If it is not determined that there are fewer than four sheets, the process proceeds to S107 (No in S105). Here, the situation where the number of clipped map images stored in the storage unit 14 is less than four is a cut map before the map image is updated from the storage unit 14 by the control unit 10 in S111, which will be described later. This is when the image is erased.

  In S <b> 106, the control unit 10 of the in-vehicle device 1 requests the mobile terminal 2 to transmit a new clipped map image because the number of clipped map images stored in the storage unit 14 is less than four.

  In S <b> 210, the control unit 20 of the mobile terminal 2 determines whether a cut map image transmission request is received from the in-vehicle device 1. When the control unit 20 determines that the cut-out map image transmission request has been received from the in-vehicle device 1, the control unit 20 transmits the cut-out map image to be stored next in the in-vehicle device 1, and proceeds to S212 (S210). No). If the control unit 20 does not determine that a cut map image transmission request has been received from the in-vehicle device 1, the control unit 20 proceeds to S212 without transmitting the cut map image to the in-vehicle device (Yes in S210).

<Guidance end determination process>
In S107, the control unit 10 of the in-vehicle device 1 determines whether or not the coordinate data received from the mobile terminal 2 is included in the destination by the guidance end determination function. That is, since the purpose of the navigation system 100 is to guide the user to the destination, the navigation system 100 regards that the vehicle has reached the destination when the coordinate data is included in the destination included in the map image. To stop. Accordingly, when the control unit 10 determines that the coordinate data received from the mobile terminal is included in the destination, the control unit 10 proceeds to S108 and transmits an end notification indicating that the guidance has ended to the mobile terminal 2 (Yes in S107). ). If it is not determined that the coordinate data is included in the destination, the process proceeds to S109 (No in S107).

  In S212, the control unit 20 of the mobile terminal 2 determines whether or not an end notification has been received. When it is determined that the end notification has been received, the control unit 20 ends navigation control such as coordinate data calculation processing and coordinate data transmission processing (Yes in S212). If it is not determined that the end notification has been received, the processing from S206 is repeated (No in S212).

<Map image update processing>
In S109, the control unit 10 of the vehicle-mounted device 1 determines whether or not the coordinate data received from the mobile terminal 2 is included in the update area c of the extracted map image M1 illustrated in FIG. Here, the update area c is an area having a predetermined width around the map image displayed on the display / operation unit 11, that is, an edge. The position where the update area c and the route b overlap is the update position cb, and the map image is updated when the vehicle position mark a is located at the update position cb. Since the vehicle is assumed to move along the route, in the present embodiment, it is determined that the vehicle position mark a is located at the update position cb when the coordinate data is included in the update area c. It has become. This update area c is an area that overlaps the peripheral area of the start position of the map image to be updated and displayed next, and allows the user to recognize that it has continuity with the previous map image when updated and displayed. . If it is not determined that the coordinate data is included in the update area c of the map image, the process returns to S104, and the processes after S104 are repeated (No in S109). When it is determined that the coordinate data is included in the update area c of the map image, the process proceeds to S110 (Yes in S109).

  In S110, the next cut-out map image M2 is read from the storage unit 14, updated and displayed on the display / operation unit 11, and the process proceeds to S111. The cut-out map image to be updated and displayed is stored in the storage unit 14 before being updated by the map image storage process performed by the control unit 10 in cooperation with the mobile terminal 2, so that it is appropriate without delaying the update display. Can be executed at the timing. Thereafter, the same map image update processing is executed for the cut map images M2 to M19 shown in FIG.

  In S111, erase control of the oldest image, which is a part of control in the map image storage process, is performed. That is, the control unit 10 of the in-vehicle device 1 erases the oldest map image in order to maintain the maximum number of four images to be stored in the storage unit 14 because the storage unit 14 has more than four. The oldest map image means a cut-out map image displayed before updating.

  As described above, in the navigation system 100 according to the present embodiment, when the user moves the vehicle away from the set route, the mobile terminal 2 that is the data providing device and the server 3 cooperate to execute the reroute processing. Since it takes time from the start of the reroute processing until the in-vehicle device 1 acquires the cut-out map image and displays it on the display / operation unit 11 due to a communication speed delay or the like, The first control unit 10 combines only a plurality of map images stored in the storage unit 14, and displays the entire combined map image on the display / operation unit 11, so that the user can go in any direction. This makes it easier to predict whether you can return to the route.

  Further, while the mobile terminal 2 that is the data providing apparatus and the server 3 are executing the reroute process in cooperation, the data providing apparatus preferentially executes the process, so that the mobile terminal 2 in the in-vehicle device 1 is executed. However, the in-vehicle device 1 receives the detected values from the rotation detection unit 6 and the vehicle speed detection unit 7 received via the in-vehicle network 8 and the coordinates immediately before the reception processing is stopped. By predicting the coordinate data of the vehicle position mark a in the current map image based on the data, the vehicle position mark a can be updated and displayed in the composite map image, and the user is driving the vehicle. The area can be recognized.

<2. Second Embodiment>
Next, a second embodiment will be described. Compared with the first embodiment, the second embodiment performs different processing with respect to the image composition processing performed in S103 shown in FIG. Below, it demonstrates centering on difference with 1st Embodiment.

<Image composition processing>
In the present embodiment, the control unit 10 of the in-vehicle device 1 executes an image composition process using an image composition function. In the present embodiment, the control unit 10 acquires the vehicle speed value x based on the detection value received by the input / output unit 16 from the vehicle speed detection unit 7 via the in-vehicle network 8, and the storage unit according to the acquired vehicle speed value x. 14 changes the number of composite images stored in the plurality of images. Therefore, in the first embodiment, the number of map images stored in the storage unit 14 is four, but in the present embodiment, the number of map images stored in the storage unit 14 is six. The composite number of maps can be flexibly changed according to the vehicle speed value x. In order to exhibit this function, in the map image storage process of S105 in the flowchart of FIG.

  In S103, the image composition processing in the present embodiment performed by the control unit 10 of the in-vehicle device 1 will be described with reference to the flowchart of FIG.

  In S115, the control unit 10 determines whether or not the acquired vehicle speed value x is 0 km / h or more (first determination), and then determines whether or not the acquired vehicle speed value x is 40 km / h or more (second determination). Next, it is determined (third determination) whether or not the acquired vehicle speed value x is 60 km / h or more. The control unit 10 determines the vehicle speed value x in this order, and executes the processes in the later order with the determination result being “true”. For example, when the vehicle speed value x is 50 km / h, the control unit 10 determines that the first determination is “true”, the second determination is “true”, and the third determination is “false”. Since the result after the determination result is the result of the second determination, the processing at the time of this determination is executed. In other words, when the vehicle speed value x is 0 km / h or more and less than 40 km / h, the process proceeds to S116. When the vehicle speed value x is 40 km / h or more and less than 60 km / h, the process proceeds to S117. When the vehicle speed value x is 60 km / h or more, the process proceeds to S116.

  In S116, the control unit 10 of the in-vehicle device 1 is stored in the storage unit 14 because the vehicle speed value x acquired based on the detection value received from the vehicle speed detection unit 7 is 0 km / h or more and less than 40 km / h. Of the six map images, four map images are combined. As shown in G6 of FIG. 14, four map images from M5 to M8 are synthesized. The map image combining process is executed based on unique address data assigned to the map image. Further, the control unit 10 processes the image by, for example, blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G7 in FIG.

  In S117, the control unit 10 of the in-vehicle device 1 is stored in the storage unit 14 because the vehicle speed value x acquired based on the detection value received from the vehicle speed detection unit 7 is 40 km / h or more and less than 60 km / h. Of the six map images, five map images are combined. As shown in G7 of FIG. 14, five map images from M5 to M9 are synthesized. The map image combining process is executed based on unique address data assigned to the map image. Further, the control unit 10 processes the image by, for example, blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G7 in FIG.

  In S118, since the vehicle speed value x acquired based on the detection value received from the vehicle speed detection unit 7 is 60 km / h or more, the control unit 10 of the in-vehicle device 1 has six maps stored in the storage unit 14. Six map images of the images are combined. As shown in G8 of FIG. 14, six map images from M5 to M10 are synthesized. The map image combining process is executed based on unique address data assigned to the map image. Further, the control unit 10 processes the image by, for example, blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G8 in FIG.

  Since the process of S119-S122 is the same as S111-S114 of the flowchart FIG. 11, description is abbreviate | omitted.

  When the user runs the vehicle deviating from the set route, the mobile terminal 2 that is the data providing device and the server 3 cooperate to execute the reroute process, but the vehicle-mounted device 1 is extracted from the start of the reroute process. Since it takes time to acquire an image and display it on the display / operation unit 11 due to a communication speed delay or the like, the control unit 10 of the vehicle-mounted device 1 is stored in the storage unit 14 during that time. In addition, by combining only a plurality of map images and displaying the entire combined map image on the display / operation unit 11, it is easy for the user to predict which direction the user can return to the route. .

  However, if the composite map image is not adapted to the speed of the vehicle, the user often feels inconvenient. For example, when the user is driving the vehicle at a vehicle speed of 60 km / h or higher, if the control unit 10 displays the entire composite map image based on the four map images on the display / operation unit 11, the vehicle speed is 60 km. / H or more, it is conceivable that the map image of the vehicle position mark a in the map image will be moved in a blink of an eye, and the map image ahead of the vehicle position mark a is displayed / There is a situation in which the operation unit 11 is not sufficiently displayed and it is difficult for the user to predict the operation.

  On the other hand, when the user is driving the vehicle at a vehicle speed of 40 km / h or less, if the control unit 10 displays the entire composite map image based on the six map images on the display / operation unit 11, the vehicle speed Is 40 km / h or less, the vehicle position mark a of the map image moves slowly through one map image. In this case, the user would like to make a prediction while knowing the details of the map image of the area that is currently running, but the entire six composite map images with small map images are displayed on the display / operation unit 11. As a result, it becomes difficult for the user to make the prediction.

  According to the present embodiment, while it takes time due to the reroute process in the navigation system 100, the control unit 10 of the in-vehicle device 1 changes the number of composite map images displayed on the display / operation unit 11 according to the vehicle speed. Therefore, it is possible to display a composite map image appropriate for making it easier to predict which direction the user can return to the route.

<3. Third Embodiment>
Next, a third embodiment will be described. In the third embodiment, as compared with the first embodiment, another process is performed with respect to the image composition process performed in S103 shown in FIG. Below, it demonstrates centering on difference with 1st Embodiment.

<Image composition processing>
In the present embodiment, the control unit 10 of the in-vehicle device 1 executes an image composition process using an image composition function. In the present embodiment, the control unit 10 determines which area is traveling based on the cut-out map image stored in the storage unit 14, and combines the areas according to the determination result. The number of map images to be changed is changed. Therefore, in the first embodiment, the number of map images stored in the storage unit 14 is four, but in the present embodiment, the number of map images stored in the storage unit 14 is six. The composite number of map images can be flexibly changed according to the travel area. In order to exhibit this function, in the map image storing process in S105 of the flowchart in FIG. 9, the number stored and maintained in the storage unit 14 is six.

  In S103, the image composition processing in the present embodiment performed by the control unit 10 of the in-vehicle device 1 will be described based on the flowchart of FIG.

  In S123, the control unit 10 determines whether or not the traveling area is a tunnel based on the extracted map image stored in the storage unit 14. When it is determined that the traveling area is a tunnel, the process proceeds to S124. If it is not determined that the travel area is a tunnel, the process proceeds to S125.

  In S <b> 124, the control unit 10 of the in-vehicle device 1 synthesizes six map images among the six map images stored in the storage unit 14. As shown in G8 of FIG. 14, six map images from M5 to M10 are synthesized. The map image combining process is executed based on unique address data assigned to the map image. Further, the control unit 10 processes the image by, for example, blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G8 in FIG.

  In S125, the control unit 10 determines whether there is no signal within a predetermined distance in the traveling direction from the current position of traveling based on the extracted map image stored in the storage unit 14, for example, within 10 km. To do. When it is determined that there is no signal within 10 km, the process proceeds to S126. If it is not determined that there is no signal within 10 km, the process proceeds to S127.

  In S <b> 126, the control unit 10 of the in-vehicle device 1 synthesizes five map images among the six map images stored in the storage unit 14. As shown in G7 of FIG. 14, six map images from M5 to M9 are synthesized. The map image combining process is executed based on unique address data assigned to the map image. Further, the control unit 10 processes the image by, for example, blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G7 in FIG.

  In S <b> 127, the control unit 10 of the in-vehicle device 1 synthesizes four map images among the six map images stored in the storage unit 14. As shown in G8 of FIG. 14, four map images from M5 to M8 are synthesized. The map image combining process is executed based on unique address data assigned to the map image. Further, the control unit 10 processes the image by blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G6 in FIG.

  The processing of S128 to S131 is the same as S111 to S114 of the flowchart in FIG.

  When the user runs the vehicle deviating from the set route, the mobile terminal 2 that is the data providing device and the server 3 cooperate to execute the reroute process, but the vehicle-mounted device 1 is extracted from the start of the reroute process. Since it takes time to acquire an image and display it on the display / operation unit 11 due to a communication speed delay or the like, the control unit 10 of the vehicle-mounted device 1 is stored in the storage unit 14 during that time. In addition, by combining only a plurality of map images and displaying the entire combined map image on the display / operation unit 11, it is easy for the user to predict which direction the user can return to the route. .

  However, there are many cases where the user feels inconvenient unless the composite map image is adapted to the area where the vehicle is traveling. For example, when the user is driving a vehicle in a tunnel, if the control unit 10 displays the entire composite map image based on four map images on the display / operation unit 11, the travel area is a tunnel. In addition, it is conceivable that the majority of the map image will be displayed as tunnels and mountains, etc., and the map image after the vehicle travels through the tunnel is insufficient, making it difficult for the user to predict it. appear.

  In addition, when the user is driving the vehicle on a road having no signal within a predetermined distance in the traveling direction from the current position, for example, within 10 km, the control unit 10 displays the entire composite map image based on the four map images. If displayed on the display / operation unit 11, the traveling speed of the vehicle tends to be relatively high because the traveling area is a 10 km road with no signal. In this case, since the traveling speed of the vehicle is relatively fast, it is conceivable that the vehicle position mark “a” of the map image moves quickly in the composite map image composed of four images. The previous map image is not sufficiently displayed on the display / operation unit 11, and it is difficult for the user to predict the map image.

  According to the present embodiment, while it takes time due to the reroute process in the navigation system 100, the control unit 10 of the in-vehicle device 1 determines the number of composite map images to be displayed on the display / operation unit 11 according to the traveling area of the vehicle. Therefore, it is possible to display an appropriate composite map image in order to make it easier to predict which direction the user can return to the route.

<4. Fourth Embodiment>
Next, a fourth embodiment will be described. In the fourth embodiment, as compared with the first embodiment, another process is performed with respect to the image synthesis process performed in S103 shown in FIG. Below, it demonstrates centering on difference with 1st Embodiment.

<Image composition processing>
In the present embodiment, the control unit 10 of the in-vehicle device 1 executes an image composition process using an image composition function. In the present embodiment, a composite map obtained by synthesizing a plurality of map images stored in the storage unit 14 in accordance with an operation amount of a user operation received by the control unit 10 by the display / operation unit 11 or the operation unit 22. The image is cut out to a size displayed on the display / operation unit 11 and displayed there. That is, the control unit 10 scrolls and displays the composite map image to be displayed on the display / operation unit 11 according to the user operation amount received by the display / operation unit 11 or the operation unit 22. For example, the control unit 10 combines the cutout map images M5 to M8 shown in FIG. 17, and the control unit 10 displays the size e to be displayed on the display / operation unit 11 from the combined map image. 11 or according to the operation amount of the user operation received by the operation unit 22 and displayed on the display / operation unit 11.

  In S103, the image composition processing in the present embodiment performed by the control unit 10 of the in-vehicle device 1 will be described based on the flowchart of FIG.

  In S <b> 132, the control unit 10 synthesizes the map images of the four map images stored in the storage unit 14.

  In S <b> 133, the control unit 10 of the in-vehicle device 1 includes a plurality of maps stored in the storage unit 14 according to the operation amount of the user operation received by the display / operation unit 11 or the operation unit 22 by the control unit 10. A composite map image obtained by combining the images is cut out to the size of the display / operation unit 11. The map image combining process is executed based on unique address data assigned to the map image. Further, the control unit 10 processes the image by, for example, blackening the map data c that is insufficient when displaying the entire combined map image as indicated by G7 in FIG.

  In S <b> 134, the control unit 10 of the in-vehicle device 1 displays the extracted map image on the display / operation unit 11.

  The processing in S135 and S136 is the same as S113 and S114 in the flowchart of FIG.

  When the user runs the vehicle deviating from the set route, the mobile terminal 2 that is the data providing device and the server 3 cooperate to execute the reroute process, but the vehicle-mounted device 1 is extracted from the start of the reroute process. Since it takes time to acquire an image and display it on the display / operation unit 11 due to a communication speed delay or the like, the control unit 10 of the vehicle-mounted device 1 is stored in the storage unit 14 during that time. In addition, by synthesizing a plurality of map images and displaying the entire combined map image on the display / operation unit 11, it is easy for the user to predict which direction the user can return to the route.

  However, if the composite map image is not made according to the user's intention, the user often feels inconvenient. For example, a user may drive a vehicle at various speeds, and may want to make a prediction by displaying a map ahead of the current driving area by increasing the speed of the vehicle. You may want to make a prediction while knowing the details of the map image of the area you are currently driving at a slower speed. In such a case, a situation occurs in which the map image according to the user's intention cannot be displayed and the user has difficulty in predicting the map image.

  According to the present embodiment, while the rerouting process in the navigation system 100 takes time, the control unit 10 of the in-vehicle device 1 displays the image of the composite map image displayed on the display / operation unit 11 by the user display / operation unit 11. Alternatively, since it is changed according to the operation amount received by the operation unit 22, it is possible to display an appropriate composite map image to make it easier to predict which direction the user should go to return to the route.

<5. Fifth embodiment>
Next, a fifth embodiment will be described. In the first to fourth embodiments, the navigation system has been described as including the in-vehicle device 1, the portable terminal 2 that is a data providing device, and the server 3, but as shown in FIG. It is good also as the navigation system 101 which is not provided with the portable terminal 2 comprised including the server 3 which is the vehicle equipment 1 and a data provision apparatus.

  In this case, communication is performed between the in-vehicle device 1 and the server 3 to realize a navigation function. The vehicle-mounted device 1 includes a communication unit that communicates with the server 3 to transmit and receive data related to navigation, and the server 3 includes a communication unit that communicates with the vehicle-mounted device 1 and transmits and receives data related to navigation.

  In the above-described embodiment, the control unit 20 of the mobile terminal 2 has been described as executing the map image cutting process by the map image generation function. In this case, the control unit 30 of the server 3 executes the process. Although it has been described that the control unit 20 calculates coordinate data based on position data by the coordinate data calculation function and executes a transmission process to the in-vehicle device 1, in this case, the control unit 10 of the in-vehicle device 1 executes the process. Processing in which the control unit 20 determines whether or not the coordinate data has deviated from the extracted map image or the route included in the route surrounding map image by the route departure determination function, and transmits a departure notification to the server 3 when the departure has occurred. In this case, the control unit 10 of the in-vehicle device 1 executes the process. Moreover, although demonstrated that the control part 20 performed a map matching process based on the vehicle information acquired from the vehicle equipment 1 by the map matching function, in this case, the control part 10 of the vehicle equipment 1 performs the process.

  In the fifth embodiment, the GPS communication unit is provided in the in-vehicle device 1, and the control unit 10 of the in-vehicle device 1 performs a process of calculating the current position data of the vehicle received by the GPS communication unit into coordinate data at a predetermined timing. Execute.

  The control unit 10 of the in-vehicle device 1 realizes each function described above based on the calculated coordinate data.

  In the navigation system of the fifth embodiment, the server 3 provides navigation-related data to the in-vehicle device 1. Therefore, only the server 3 is a data providing apparatus that provides data related to navigation to the in-vehicle device 1.

  Note that the mobile terminal 2 may have the same function as the server 3 of the present embodiment. In this case, only the mobile terminal 2 becomes a data providing apparatus that provides data related to navigation to the in-vehicle device 1.

<6. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible. Other embodiments will be described below. Of course, you may combine the form demonstrated below suitably.

  In the first and second embodiments described above, the GPS communication unit is described as being provided in the mobile terminal 2 in the navigation system, but the GPS communication unit may be provided on the vehicle side. In this case, the control unit 10 of the in-vehicle device 1 is communicably connected to the GPS communication unit, derives the current position data of the vehicle based on the signal received by the GPS communication unit, and outputs the derived one data at a predetermined timing. It transmits to the portable terminal 2. The position data is acquired by the mobile terminal 2 when the short-range wireless communication unit 21 of the mobile terminal 2 receives the position data. The control unit 20 of the portable terminal 2 calculates coordinate data based on the received position data, and transmits the coordinate data to the in-vehicle device 1 at a predetermined timing. The control unit 10 of the in-vehicle device 1 updates and displays the vehicle position mark a on the map image displayed on the display / operation unit 11 based on the coordinate data. Moreover, the control part 20 of the portable terminal 2 receives position data from the vehicle equipment 1 at a predetermined timing, and executes route deviation determination processing based on this position data. While performing the reroute process, the position data can be derived based on the signal obtained by the GPS communication unit, and the vehicle position mark a can be updated and displayed in the composite map image based on the derived position data. .

  In the above embodiment, the coordinate data is transmitted from the portable terminal 2 to the in-vehicle device 1 as the current position data of the vehicle. However, the portable terminal 2 carries an image including only the own vehicle position mark a as the position data. It transmits from the terminal 2, and the vehicle equipment 1 may be made to superimpose the image on a map image as one layer.

  Further, in the above-described embodiment, it has been described that various functions are realized in software by the arithmetic processing of the CPU according to the program. However, some of these functions are realized by an electrical hardware circuit. Also good. Conversely, some of the functions realized by the hardware circuit may be realized by software.

  Furthermore, each process in the flowchart for explaining the control of each embodiment is shown as one series for the sake of convenience, but each control unit processes each process in parallel, or the priority order is set and processed. It may be anything. For example, the own vehicle position mark update process and the map image update process executed by the control unit 10 of the in-vehicle device 1 do not need to be executed in the order shown in FIG. 9 and are executed at a cycle set for each process. However, it may be executed based on a set priority order, or executed when a predetermined event occurs, and each control unit performs control after each process. Mediation may be performed to achieve the above.

DESCRIPTION OF SYMBOLS 1 In-vehicle apparatus 2 Portable terminal 3 Server 4 GPS satellite 10 Control part 11 Display / operation part 15 Short-range wireless communication part 20 Control part 21 Short-range wireless communication part 27 GPS communication part 28 Communication part 33 Storage part 34 Communication part

Claims (9)

A navigation system comprising an in-vehicle device mounted on a vehicle and having a display means, and a data providing device for providing navigation-related data to the in-vehicle device,
The data providing device includes:
Current position acquisition means for acquiring the current position of the vehicle;
First route acquisition means for acquiring a route to the destination of the vehicle;
Second route acquisition means for re-acquiring a new route from the current location to the destination when the current location deviates from the route;
Map image generating means for generating a plurality of map images used for guiding the route, the size of which matches the screen of the display means of the in-vehicle device;
Transmitting means for sequentially transmitting the plurality of generated map images to the in-vehicle device;
With
The in-vehicle device is
Receiving means for sequentially receiving the plurality of map images from the data providing device;
Storage means for storing the map image received in the receiving means;
Detecting means for detecting that the current position deviates from the route;
When it is not detected that the current position deviates from the route, a guide screen using one map image is displayed on the display means, and when it is detected that the current position deviates from the route, the memory is stored. Display control means for displaying on the display means a guide screen using a plurality of map images stored in the means;
A navigation system comprising: The navigation system according to claim 1,
When it is detected that the current position has deviated from the route, the display control means causes the display means to display the entire composite image of a plurality of map images stored in the storage means. And navigation system. The navigation system according to claim 1,
The in-vehicle device is
Operation means for accepting user operations;
Further comprising
When it is detected that the current position deviates from the route, the display control unit causes the display unit to display a part of a composite image of a plurality of map images stored in the storage unit, and the user A navigation system, wherein the display unit displays another part of the composite image by scrolling according to an operation. The navigation system according to any one of claims 1 to 3,
In-vehicle devices
Input means for inputting the traveling speed of the vehicle;
Further comprising
The navigation system according to claim 1, wherein the display control means determines the number of the map images used for the guidance screen according to the traveling speed when it is detected that the current position deviates from the route. The navigation system according to any one of claims 1 to 3,
In-vehicle devices
Determining means for determining a traveling area in which the vehicle is traveling based on the map image;
Further comprising
The navigation system according to claim 1, wherein the display control means determines the number of the map images used for the guidance screen based on a travel area when it is detected that the current position deviates from the route. The navigation system according to any one of claims 1 to 5,
The in-vehicle device is
Position receiving means for receiving the current position of the vehicle from the data providing device;
Derivation means for deriving a current position of the vehicle based on a signal from an external device provided in the vehicle;
Further comprising
The display control means includes
If it is not detected that the current position deviates from the route, the vehicle position mark is displayed in the guidance screen based on the current position received from the data providing device,
When it is detected that the present position has deviated from the route, a navigation system is characterized in that a vehicle position mark is displayed in the guidance screen based on the derived present position. An in-vehicle device that is mounted on a vehicle and receives data related to navigation from a data providing device and displays a guidance screen on a display means,
The data providing device re-acquires a new route from the current position to the destination when the current position of the vehicle deviates from a predetermined route,
Receiving means for sequentially receiving a plurality of map images for use in guiding the route, the size being adapted to the screen of the display means, from the data providing device;
Storage means for storing the map image received in the receiving means;
Detecting means for detecting that the current position of the vehicle deviates from the route;
When it is not detected that the current position of the vehicle deviates from the route, a guide screen using one map image is displayed on the display means, and when it is detected that the current position deviates from the route Display control means for displaying on the display means a guidance screen using a plurality of map images stored in the storage means;
An in-vehicle device comprising: A navigation method in a navigation system having an in-vehicle device mounted on a vehicle and having a display means, and a data providing device for providing navigation-related data to the in-vehicle device,
The data providing device acquiring a current position of the vehicle;
The data providing device obtaining a route to the destination of the vehicle;
The data providing device, when the current position deviates from the route, reacquiring a new route from the current position to the destination;
A step of generating a plurality of map images used for guiding the route, the data providing apparatus having a size matched to a screen of the display unit of the in-vehicle device;
The data providing device sequentially transmitting the generated map images to the in-vehicle device; and
The in-vehicle device sequentially receiving the plurality of map images from the data providing device;
The vehicle-mounted device stores the received map image in a storage means;
The in-vehicle device detecting that the current position has deviated from the route;
When the on-vehicle device does not detect that the current position has deviated from the route, a step of displaying a guide screen using one map image on the display means;
When the on-vehicle device detects that the current position has deviated from the route, displaying a guidance screen using a plurality of map images stored in the storage unit on a display unit;
The navigation method characterized by performing. A program that is mounted on a vehicle and that can be executed by a computer included in an in-vehicle device that receives data related to navigation from a data providing device and displays a guidance screen on a display unit,
The data providing device re-acquires a new route from the current position to the destination when the current position of the vehicle deviates from a predetermined route,
Execution of the program by the computer causes the computer to
Sequentially receiving a plurality of map images for use in guiding the route from the data providing device, the size of which matches the screen of the display means;
Storing the received map image in the storage means;
Detecting that the current position of the vehicle deviates from the route;
If it is not detected that the current position of the vehicle deviates from the route, displaying a guidance screen using a single map image on the display means;
A step of displaying on the display means a guide screen using a plurality of map images stored in the storage means when it is detected that the current position deviates from the route;
A program characterized by having executed.

Images