JPH07103779A - Vehicle-mounted navigation device - Google Patents

Abstract

PURPOSE:To enable a path to be seen easily by calculating the distance to a set destination from a detected current location and then switching the scale of a road map accordingly. CONSTITUTION:The current location of a vehicle is obtained by obtaining the driving trace of the vehicle based on the vehicle driving distance and advancing azimuth which are detected by signals from a vehicle sensor 1 and an azimuth sensor 2 and then matching it to the road map. A controller 6 obtains the current location and at the same time inputs a destination which is set by an input device 4. Then, a scale factor for displaying the road map from the current location to the destination on the display screen of a display 7 is calculated, the scale of the road map is switched, and then the current location and destination are displayed on the map, thus switching to a more detailed map closer to the destination and enabling a path to be visually and easily recognized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted navigation device for displaying the current position of a vehicle on a road map and guiding an occupant to a destination.

[0002]

2. Description of the Related Art A vehicle-mounted navigation device that presets a point for changing the scale of a road map displayed on a display and automatically changes the scale of the road map when a vehicle reaches near the scale changing point. Is known (for example, see Japanese Patent Laid-Open No. 1-196513). With this device, for example, the destination is set as a scale change point, and when the vehicle reaches the vicinity of the destination, it is automatically changed to a detailed road map, and the roads around the destination are enlarged and displayed to show the route to the destination. Is easy to see.

There is also known an on-vehicle navigation device which displays a traveling route from a departure place to a destination on a display screen of a display (for example, Japanese Patent Publication No.
-14286). In this device, the scale ratio of the road map is set so that the starting point and the destination are located on the outer periphery of the rectangular area set on the display.

[0004]

However, in the former vehicle-mounted navigation device, when the current position and the destination are not displayed on the screen of the display, the direction and distance to the destination cannot be known, and thus, it is roughly There is a problem that even such a route cannot be grasped. Further, since the detailed map cannot be switched until the destination which is the scale change point is reached, there is a problem that the displayed map is difficult to see and it is difficult to visually recognize the route to the destination.

In the latter on-vehicle navigation device, when the distance from the departure place to the destination is long, the scale ratio of the map becomes large, and the road map reduced to a large scale ratio is displayed to the destination. Therefore, there is a problem that the map is difficult to see and it is difficult to visually recognize the route.

An object of the present invention is to provide a vehicle-mounted navigation device in which a detailed road map is sequentially switched as the distance from the present position to the destination or the waypoint is shortened so that the route to the destination or the waypoint can be easily visually recognized. To do.

[0007]

The present invention will be described with reference to FIG. 1, which is a claim correspondence diagram, and the invention of claim 1 is a present position detecting means 100 for detecting the present position of a vehicle.
On-vehicle equipment including a destination setting means 101 for setting a destination, a storage means 102 for storing a road map, and a control means 104 for reading a road map around the present location from the storage means 102 and displaying it on the display means 103. It is applied to navigation devices. Then, the distance calculating means 105 for calculating the distance from the current position detected by the current position detecting means 100 to the destination set by the destination setting means 101.
And the distance calculation means 10 is controlled by the control means 104A.
The above-described object is achieved by switching the scale of the road map according to the distance to the destination calculated in 5.
Further, in the vehicle-mounted navigation device according to the second aspect, the display means 10 displays the present location and the destination by the control means 104B.
The road map is switched to the scale displayed on the screen of No. 3. The vehicle-mounted navigation device according to claim 3 includes a waypoint setting means 106 for setting a waypoint on the route to the destination. When the waypoint is set by the waypoint setting means 106, the distance calculation means 105A causes The distance from the current location detected by the current location detection means 100 to the transit location set by the transit location setting means 106 is calculated, and the control means 104C calculates the distance according to the distance to the transit location calculated by the distance calculation means 105A. The map scale is switched. The vehicle-mounted navigation device according to claim 4 is a route calculation unit 107 that calculates a route from the current position to the destination, and a branch point on the route calculated by the route calculation unit 107 is set as a waypoint to the destination. When the transit point is set by the transit point setting means 106A, the distance calculating means 105B sets the transit point set by the transit point setting means 106A from the current location detected by the current location detecting means 100. Calculate the distance to
The control means 104D switches the scale of the road map according to the distance to the waypoint calculated by the distance calculation means 105B. In the vehicle-mounted navigation device according to claim 5, when the waypoints are set by the waypoint setting means 106 and 106A by the control means 104E, the current location and the waypoints are displayed on the screen of the display means 103 at a reduced scale road map. Is to be switched.

[0008]

In the vehicle-mounted navigation device according to the first aspect, the scale of the road map being displayed is switched according to the distance from the current position to the destination. As a result, as the destination approaches, the road map is switched to a detailed one, the route to the destination is easily visible, and the occupant can be reliably guided to the destination. In the vehicle-mounted navigation device according to claim 2,
The road map is switched to a scale where the current location and the destination are within the display screen. As a result, even if the distance between the current location and the destination is long, a rough route can be grasped from the time of departure, the route is switched to a detailed road map as the destination approaches, and the route to the destination can be easily viewed. In the vehicle-mounted navigation device according to the third aspect, when the waypoint is set on the route to the destination, the scale of the road map is switched according to the distance from the current position to the waypoint. As a result, an arbitrary waypoint can be set on the route to the destination, the detailed road map is switched as the waypoint approaches, and the route to the waypoint can be easily confirmed. In the vehicle-mounted navigation device according to claim 4, a route from the current position to the destination is calculated, a branch point on the route is automatically set as a waypoint to the destination, and the route is determined according to the distance from the current place to the waypoint. To change the scale of the road map. As a result, the road branch point is automatically set as the waypoint without the need to set the waypoint,
Operability is improved. In the vehicle-mounted navigation device according to the fifth aspect, the road map is switched to a scale in which the present location and the waypoint are included in the display screen. As a result, a rough route can be grasped from the time of departure even if the distance between the present location and the waypoint is long, and the route is switched to a detailed road map as the waypoint approaches, making it easier to visually recognize the route to the waypoint.

[0009]

【Example】

—First Embodiment— FIG. 2 shows the configuration of the first embodiment. In the figure, a vehicle speed sensor 1 is attached to, for example, a transmission of a vehicle and generates a predetermined number of pulse signals per revolution of a speedometer pinion (not shown). The traveling speed of the vehicle can be detected by detecting the number of pulses or pulse cycle generated from the vehicle speed sensor 1 per unit time, and the traveling distance of the vehicle can be detected by counting the number of pulses. The direction sensor 2 detects the traveling direction of the vehicle. G
The PS receiver 3 receives GPS signals transmitted from a plurality of satellites, performs GPS positioning calculation, and detects the current position, traveling direction, etc. of the vehicle. The input device 4 inputs information such as the current location and destination and various commands, and the storage device 5 stores road map data.

The control device 6 is composed of a microcomputer and its peripheral parts, calculates the present position of the vehicle, the scale of the displayed map, the optimum route, and displays them on the display 7. The current location of the vehicle is calculated by self-contained navigation. That is, the traveling locus of the vehicle is calculated based on the traveling distance and the traveling direction of the vehicle detected by the signals from the vehicle speed sensor 1 and the direction sensor 2, and the traveling locus is collated with a road map to perform map matching, Calculate your current location. The current position of the vehicle calculated by the self-contained navigation is corrected as necessary by the current position calculated by the GPS positioning calculation described above.

FIG. 3 is a flow chart showing the main control program of the microcomputer. The operation of the first embodiment will be described with reference to this flowchart. In step S2, the current position of the vehicle is calculated and the destination set by the input device 4 is input. In the following step S4, it is determined whether or not the current location is equal to the destination, that is, whether or not the vehicle has reached the destination. If the destination is reached, the execution of the program is terminated, otherwise, to step S6. move on. In step S6, the subroutine shown in FIG. 4 is executed to calculate the scale factor for displaying the road map from the current position to the destination on the display screen of the display 7, and the scale of the road map is switched and the switched road is changed. Display the current location and destination of the vehicle on the map. Next, in step S8, the subroutine shown in FIG. 5 is executed to determine a reference area centered on the destination that serves as a determination reference when switching the scale of the road map. That is, the scale of the road map is switched when the vehicle reaches the reference area. In step S10, the subroutine shown in FIG. 6 is executed to determine whether or not the vehicle has reached the reference area.

In step S12, it is determined whether or not more detailed road map data than the road map currently displayed on the display 7 is stored in the storage device 5, and if there is detailed road map data, the process proceeds to step S6. If not returned, the process proceeds to step S14. That is, as the vehicle gets closer to the destination, the detailed road map is sequentially switched, and when there is no more detailed road map data, the process proceeds to step S14.
In step S14, the current position of the vehicle is calculated and displayed. In a succeeding step S16, it is determined whether or not the destination is reached, and when the destination is reached, the execution of the program is ended, and if not, the process returns to the step S14.

FIG. 4 is a flowchart showing a scale ratio calculation / scale switching routine. The current position is calculated in step S30, and the process proceeds to step S32. Here, when the east-west direction on the road map is set to the X-axis and the north-south direction is set to the Y-axis, the coordinates of the current position of the vehicle are set to (Xs, Ys), and the coordinates of the destination or the waypoint are set to (Xg , Yg). Further, as shown in FIG. 7, the horizontal axis on the screen 7a of the display 7 is the U axis corresponding to the X axis, and the vertical axis is the V axis corresponding to the Y axis. It is assumed that the center of 7a is the origin O and is represented by UV coordinates. In addition, screen 7
A rectangular area 7b having a horizontal length ix and a vertical length iy is set on a. The size of the rectangular area 7b is set according to the size of the screen 7a, display contents, and the like. Step S32
In, at the present location S (Xs, Ys), as shown in FIG.
To the destination or waypoint G (Xg, Yg) from the actual linear distance | Xs-Xg | in the X-axis direction to the horizontal length ix of the rectangular area 7b of the screen 7a, and the current location S
From (Xs, Ys) to the destination or transit point G (Xg, Y
g)) actual linear distance in the Y-axis direction | Ys-Yg |
And the ratio of the vertical length iy of the rectangular area 7b to ry,
rx and ry are calculated by the following equations.

## EQU1 ## rx = ix / | Xs-Xg | (1)

Ry = iy / | Ys-Yg | (2)

In step S34, the magnitudes of rx and ry are compared. If rx≤ry, the process proceeds to step S36 and rx
Is set to the scale factor r, and if rx> ry, step S38.
Go to and set ry to scale factor r. Step S40
Then, the current location (Xs, Ys) and the destination or transit point (X
The coordinates of the middle point C between (g, Yg) are (Xo, Yo), and Xo, Yo are calculated by the following equation.

## EQU00003 ## Xo = (Xs-Xg) / 2 (3)

## EQU00004 ## Yo = (Ys-Yg) / 2 (4)

In step S42, as shown in FIGS. 9 and 10, the route on the XY coordinates from the current position S (Xs, Ys) to the destination or stopover G (Xg, Yg) is set to the midpoint C thereof. Coordinate conversion is performed so that (Xo, Yo) is located at the origin O of the UV coordinates, and the route is reduced using the scale ratio r calculated in the above step. by this,
The current position S (Xs, Ys) moves to the point S ', and as the map shrinks, the point S "(U
s, Vs). Also, the destination or transit point G
(Xg, Yg) moves to the point G ', and further the G "point (Ug, V on the outer circumference of the rectangular area 7b as the map shrinks.
Go to g). Here, Us, Vs, Ug, and Vg are calculated by the following equation.

## EQU00005 ## Us = r (Xs-Xo) (5)

## EQU6 ## Vs = r (Ys-Yo) (6)

## EQU00007 ## Ug = r (Xg-Xo) (7)

(8) Vg = r (Yg-Yo) (8) In step S44, the scale of the road map is switched according to the scale ratio r, and the reduced road map is displayed on the display 7 as shown in FIG. , Current position S "(Us, V
A mark 8 indicating the current position of the vehicle is displayed on s), and a mark 9 indicating the destination or the stopover is displayed on the destination or stopover G "(Ug, Vg). After that, the process returns to the main program of FIG. To do.

FIG. 5 shows a reference area determination routine for switching the scale. In step S60, a straight line distance I from the current position to the destination or waypoint is calculated as shown in FIG. In the subsequent step S62, the reference area is determined. Here, a circle having a radius R centering on the destination or the waypoint is used as the reference area.

(U−Xg) ² + (V−Yg) ² = R ² (9) Further, the ratio of the radius R and the actual distance I from the current position to the destination or the waypoint is k Then,

## EQU10 ## R / I = k (10) The radius R is determined by appropriately determining the ratio k. When the reference area is decided, it returns to the main program.

FIG. 6 shows a routine for determining arrival at the reference area. 14, it is assumed that the vehicle approaches the destination or the transit point G ″ and moves to the point P (Up, Vp). At step S70, the current location P (Up, Vp).
It is determined whether or not is within a circle having a radius R centered at the destination or waypoint G ″ (Ug, Vg), that is, within the reference area. This determination is based on the following equation.

[Equation 11] (Up-Ug) ² + (Vp-Vg) ² ≤ R ² (11) If the equation (11) is satisfied, it is determined that the vehicle has arrived within the reference area and returns to the main program. Then equation (11)
Is not established, the process proceeds to step S72. If the current position of the vehicle is not reached within the reference area, the current position of the vehicle is calculated and the P point coordinates (Up, Vp) are updated, and the mark 8 is displayed at the calculated current position, and step S7 is performed.
Return to 0.

-Second Embodiment-In this second embodiment, a point designated by an occupant in advance is set as a waypoint to the destination, or the branch point obtained in the optimum route calculation is reached to the destination. Automatically set as a stopover point. The configuration of the second embodiment is similar to that of the first embodiment shown in FIG. 2, and the description thereof is omitted. 15 and 16 are flowcharts showing the main program of the second embodiment. The operation of the second embodiment will be described with reference to this flowchart. Step S80
At, the current position of the vehicle is calculated and the destination set by the input device 4 is input. Continuing step S
At 82, it is determined whether or not the occupant sets a waypoint,
When the waypoint is set by the input device 4, the process proceeds to step S84 to input and store the set waypoint. Step S8
At 6, it is determined whether or not the occupant has instructed the calculation of the optimum route to the destination, and when the route calculation is instructed by the input device 4, the process proceeds to step S88, and the optimum route from the current position to the destination is calculated. , Set a branch point on the way as a waypoint,
Remember.

In step S90, it is determined whether or not the current position is equal to the destination, that is, whether or not the vehicle has reached the destination, and if the destination is reached, the program execution is terminated. Proceed to S92. Step S
At 92, the subroutine shown in FIG. 17 is executed, and a detailed road map is sequentially displayed as the route is approached.
To display. In step S94, it is determined whether or not the vehicle has arrived at the route point on the stored route, and if it has arrived, the process proceeds to step S98, and if not, step S96.
Go to. In step S96, the current position is calculated and displayed, and the process returns to step S94. When the vehicle reaches the stopover on the route, it is determined in step S98 whether or not the destination is next. If the destination is the destination, the process proceeds to step S110. If not, the process proceeds to step S100. In step S100, the next waypoint is read out from the memory, and step S90 is executed.
Return to and repeat the above process for the next waypoint. If the destination is next, the subroutine shown in FIG. 17 is executed in step S110, and a detailed road map is sequentially displayed on the display 7 as the destination is approached. In a succeeding step S112, it is determined whether or not the vehicle has reached the destination, and when the vehicle reaches the destination, the execution of the program is ended. If the vehicle has not reached the destination yet, the process proceeds to step S114. In step S114, the current position is calculated and displayed, and the process returns to step S112.

FIG. 17 is a flowchart showing a detailed map display routine. In step S130, the subroutine shown in FIG. 4 is executed to calculate the scale factor for displaying the road map from the current location to the destination on the display screen of the display 7, and the scale of the road map is switched and the switched road is changed. Display the current location and destination of the vehicle on the map.
Next, the routine proceeds to step S132, where the subroutine shown in FIG. 5 is executed to determine the reference area centered on the destination which is the determination reference when switching the scale of the road map. That is, the scale of the road map is switched when the vehicle reaches the reference area. In step S134, the subroutine shown in FIG. 6 is executed to determine whether the vehicle has reached the reference area. In step S136, it is determined whether more detailed road map data than the road map currently displayed on the display 7 is stored in the storage device 5,
If there is detailed road map data, the process returns to step S130, and if not, the process returns to the main program. As a result, as the vehicle approaches the destination or the transit point, the detailed road map is sequentially switched, and when there is no more detailed road map data, the process returns to the main program.

In the configuration of the above embodiment, the vehicle speed sensor 1, the azimuth sensor 2, the GPS receiver 3 and the control device 6 are the present location calculating means, the input device 4 is the destination setting means and the waypoint setting means, and the storage device. Reference numeral 5 constitutes a storage means, display 7 constitutes a display means, and control device 6 constitutes a control means, a distance calculation means, and a route calculation means.

[0022]

As described above, according to the first aspect of the invention, the scale of the road map being displayed is switched according to the distance from the current position to the destination. Switching to a road map makes it easier to visually recognize the route to the destination, and it is possible to reliably guide the occupant to the destination. According to the invention of claim 2, since the road map is switched to a scale in which the current location and the destination are included in the display screen, even if the distance between the current location and the destination is long, a rough route can be grasped from the time of departure. As a result, the route is switched to a detailed road map as the destination approaches, making it easier to visually recognize the route to the destination. According to the invention of claim 3,
When a stopover is set on the route to the destination, the scale of the road map is switched according to the distance from the current position to the stopover, so any stopover can be set on the route to the destination. , As the waypoint approaches, it switches to a detailed road map, and the route to the waypoint can be easily confirmed. According to the invention of claim 4, a route from the current location to the destination is calculated, and a branch point on the route is automatically set as a waypoint to the destination, and according to the distance from the current location to the waypoint. Since I changed the scale of the road map,
Even if the setting operation of the waypoint is not performed, the road branch point is automatically set as the waypoint, and the operability is improved. According to the invention of claim 5, the road map is switched to a scale in which the current location and the waypoint are included in the display screen. Therefore, even if the distance between the current location and the waypoint is long, the rough route can be grasped from the departure point. As a result, the detailed road map is switched as the route approaches, and it becomes easier to visually recognize the route to the route.

[Brief description of drawings]

[Fig.1] Claim correspondence diagram

FIG. 2 is a block diagram showing the configuration of the first embodiment.

FIG. 3 is a flowchart showing a main program of the first embodiment.

FIG. 4 is a flowchart showing a scale ratio calculation and scale switching routine.

FIG. 5 is a flowchart showing a reference area determination routine for scale reduction switching.

FIG. 6 is a flowchart showing a routine for determining arrival at a reference area.

FIG. 7 is a diagram showing a screen of a display and a rectangular area set in the screen.

FIG. 8 is a diagram showing a relationship between a straight line route from a current location to a destination or a waypoint and a display screen.

FIG. 9 is an explanatory diagram for converting an XY coordinate system of a present location and a destination or a waypoint into a UV coordinate system of a display screen.

FIG. 10 is an explanatory diagram for setting a current location and a destination or waypoint on the outer circumference of a rectangular area set on the display screen.

FIG. 11 is a diagram showing a display example in which a road map from a current location to a destination or a waypoint is reduced and displayed.

FIG. 12 is a diagram showing a straight line distance from a current location to a destination or a waypoint.

FIG. 13 is a diagram illustrating a reference area centered on a destination or a waypoint.

FIG. 14 is a diagram showing a display example of a display that displays a state in which a vehicle is approaching a destination or a waypoint.

FIG. 15 is a flowchart showing a main program of the second embodiment.

FIG. 16 is a flowchart showing a main program of the second embodiment following FIG. 15.

FIG. 17 is a flowchart showing a detailed map display routine of the second embodiment.

[Explanation of symbols]

1 vehicle speed sensor 2 direction sensor 3 GPS receiver 4 input device 5 storage device 6 control device 7 display 7a screen 7b rectangular area 8 current position mark 9 destination or waypoint mark 100 current location detection means 101 destination setting means 102 storage means 103 Display means 104, 104A, 104B, 104C, 104D, 1
04E control means 105, 105A, 105B distance calculation means 106, 106A waypoint setting means 107 route calculation means

Claims (5)

[Claims] 1. A present location detecting means for detecting a present location of a vehicle, a destination setting means for setting a destination, a storage means for storing a road map, and a display means for reading out a road map around the present location from the storage means. In a vehicle-mounted navigation device having a control means for displaying the distance, a distance calculation means for calculating a distance from the current location detected by the current location detection means to the destination set by the destination setting means is provided, The means switches the scale of the road map according to the distance to the destination calculated by the distance calculation means. 2. The vehicle-mounted navigation device according to claim 1, wherein the control unit switches the road map to a scale at which the present location and the destination are displayed on the screen of the display unit. In-vehicle navigation device. 3. The vehicle-mounted navigation device according to claim 1, further comprising a waypoint setting means for setting a waypoint on a route to a destination, and the waypoint setting means sets the waypoint. Then, the distance calculation means calculates the distance from the current location detected by the current location detection means to the waypoint set by the waypoint setting means, and the control means calculates the waypoint calculated by the distance calculation means. An in-vehicle navigation device characterized by switching the scale of a road map according to the distance to. 4. The vehicle-mounted navigation device according to claim 1 or 2, wherein route calculation means for calculating a route from a current location to a destination and branch points on the route calculated by the route calculation means are provided. When the waypoint is set by the waypoint setting means, the distance calculation means sets the waypoint from the current location detected by the current location detection means. A vehicle-mounted navigation device, wherein a distance to the waypoint set by the means is calculated, and the control means switches the scale of the road map according to the distance to the waypoint calculated by the distance calculation means. 5. The vehicle-mounted navigation device according to claim 3, wherein the control unit displays the current location and the transit point when the transit point is set by the transit point setting unit. An on-vehicle navigation device characterized in that a road map is switched to a reduced scale displayed on the screen of the means.