JP3171522B2 - Car navigation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

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

[0001]

2. Description of the Related Art In a conventional in-vehicle navigation device, when a vehicle is traveling on a general road, a general road map around the road is displayed. The general road map includes various information including highway information, and the general road map is used even when the vehicle is traveling on the highway.

[0002]

In a conventional in-vehicle navigation device, a general road map including specific related information such as an expressway is used for traveling on a general road and traveling on a specific road. For this reason, it was difficult to see the specific road related information required when traveling on the specific road.

Accordingly, the present invention provides an on-vehicle navigation device having switching means for displaying a general road map when a vehicle is not traveling on a specific road and displaying a specific road network when the vehicle is traveling on a specific road. The purpose is to provide. It is another object of the present invention to provide an in-vehicle navigation device that displays various information related to a specific road.

[0004]

[Means for Solving the Problems] Specific roads and general roads
Storage means for storing map information and detection of vehicle position
Detecting means for detecting the
Displays the vehicle position and the map information stored in the storage means.
Display means for indicating, based on an output of the detection means,
If the vehicle is detected to be on an ordinary road,
The map information of a general road is displayed on the display means,
From the position to the specific road read from the storage means
The shortest distance is within a predetermined range and this specific road
The road has a predetermined relationship with the traveling direction of the vehicle, and the vehicle speed
If the speed is higher than the predetermined speed for more than the predetermined time
In this case, the map of the specific road is obtained from the map information of the general road.
System for controlling the display means so that the information can be switched to information and displayed.
Vehicle-mounted navigation, comprising:
Device. In the on-vehicle navigation device,
The control means reads out from the storage means from the own vehicle position.
The range where the shortest distance to the specified specific road is predetermined
If the vehicle is farther away, the map information of the specific road
Switch to map information of general roads and display
Control the steps. In the above-mentioned in-vehicle navigation device,
Map information of the specific road controlled by the control means to be displayable
Is the distance to a facility on a specific road in the vehicle traveling direction.
You. In the above car navigation system, the distance is
Read from the storage means and correspond to the vehicle position.
Vehicle traveling direction from a position on a specific road that satisfies the shortest distance
Is obtained based on the information between the nodes in. the above
Control means can be displayed on the in-vehicle navigation device
The map information of the specific road to be controlled in the vehicle traveling direction
Predicted arrival time and expected arrival time to facilities on a specific road
At least one of them.

The function read from the storage means from the own vehicle position is provided.
The shortest distance to the fixed road is within the predetermined range.
This specific road has a predetermined relationship with the traveling direction of the vehicle.
And the state in which the vehicle speed is equal to or higher than the predetermined speed
If it continues for a specific road,
The display means is controlled so that it can be switched to road map information and displayed.
I will.

[0005]

FIG. 1 is a block diagram showing an on-vehicle navigation device according to the present invention.

The on-vehicle navigation device includes a GPS receiver 1 for detecting a current position, a traveling direction, and a traveling speed of a vehicle using a GPS receiver; a map information storage device 3 including a CD-ROM or the like; An input device 5 as an input means such as a switch; a wireless reception device 7 as a communication means; a display device 20 having a screen 21 for displaying map information such as a CRT or an LCD and a current position of the vehicle; Processing unit (CPU) 11, storage unit (memory) 13, and display device
It comprises a display control section (display controller) 17 for controlling the display of the information processing section 20 and an information processing section 10 having an input / output signal processing section (interface) 15.

The above components will be described in more detail. GPS
The receiving device 1 receives a signal from a GPS artificial satellite with a GPS receiver and detects the current position, traveling direction, and traveling speed of the vehicle.

[0008] The map information storage device 3 stores a general road map and specific roads , for example, a plurality of expressways (expressway network). , Interchange service area, parking area (collectively referred to as nodes)
And node information to which the X and Y coordinates and the type of the node (expressway entrance / exit, etc.) are added as position information corresponding thereto. Further, road information including an angle from the longitude and latitude line to the road, a node connected to the road and a road type (expressway, general road, etc.) is added.

The wireless receiving device 7 is a device for receiving a minimum area communication such as a beacon, and can acquire information such as position information and road type.

FIG. 2 shows an example in which a general road map around the vehicle is displayed on the screen 21 of the display device 20 when the vehicle is traveling on a general road. In FIG. 2, a current position A of the vehicle, a general road B around the current position A, and an expressway network C are displayed together.

Next, a method of determining whether the road on which the vehicle is traveling is an expressway will be described below.

A first determination method is to provide a transmitting device for transmitting an entrance signal at the entrance of a highway and a transmitting device for transmitting an exit signal at an exit, and the radio receiving device 7 receives a highway entrance signal. Next, the information processing unit 10 determines that the vehicle has got on the highway. Then, the information processing section 10 reads out the surrounding highway network from the map information storage device 3 and displays it on the screen 21 of the display device 20. Also, the information processing unit 10
The current position of the vehicle is also displayed based on the detection signal of the PS receiver 1. Conversely, when the wireless receiving device 7 receives the signal of the exit of the highway, the information processing unit 10 determines that the vehicle has traveled from the highway to the general road. And
The information processing section 10 reads out a general road map of the vicinity from the map information storage device 3 and displays it on the screen 21 of the display device 20. The information processing unit 10 also displays the current position of the vehicle based on the detection signal of the GPS receiver 1. Next, a second determination method will be described. The information processing unit 10 calculates the current position of the vehicle detected by the GPS receiving device 1 and the shortest distance to the expressway read from the map information storage device 3, and this shortest distance is within the GPS error range and When the first condition that a highway that is substantially parallel to the traveling direction can be detected and the second condition that the vehicle is at a speed of, for example, 80 km / h or more are satisfied for a predetermined time, for example, 10 minutes, the information processing unit 10 Is
It is determined that the vehicle is traveling on a highway. Then, the information processing section 10 reads out the surrounding highway network from the map information storage device 3 and displays it on the screen 21 of the display device 20. Also,
The information processing unit 10 uses the detection signal of the GPS receiver 1
The current position of the vehicle is also displayed. Conversely, when the shortest distance from the current position of the vehicle to the expressway is more than the GPS error range, the information processing unit 10 determines that the running of the vehicle has changed from the expressway to a general road. That is, the error range is also included.
Depending on whether the vehicle is within a predetermined range of the highway.
To determine if you are on a highway. Then, the information processing unit 10 reads out a general road map of the surroundings from the map information storage device 3 and displays it on the screen 21 of the display device 20. Also,
The information processing unit 10 uses the detection signal of the GPS receiver 1
The current position of the vehicle is also displayed. The third judgment method is
When receiving a signal of an instruction to switch the display to the expressway network from the input device 5, the control processing unit 10 determines that the vehicle has started traveling on the expressway. Conversely, when receiving a signal of an instruction to switch the display to a general road from the input device 5, the control processing unit 10
Determines that the vehicle has finished traveling on the highway. The reading and display of the expressway network or the general road map are the same as those described above, and therefore the description is omitted. However, when receiving a signal prohibiting the automatic switching of the display from the input device 5, the control processing unit 10 does not perform the automatic display switching of the expressway or the general road map.

FIG. 3 shows the screen 21 of the display device 20 on the expressway network.
Shows an example of the display. Details of FIG. 3 will be described later. How to calculate the shortest distance from the current position of the vehicle to the highway,
This will be described with reference to FIGS. The current position detected by the GPS receiver 1 is defined as P (XP, YP), and both ends of the expressway are defined as Q1 (X1, Y1) and Q2 (X2, Y2). P
To the straight line of Q1 and Q2, and extend the perpendicular to the straight line of Q1 and Q2.
Is R (Xr, Yr). If R is on the highway, the distance L from P to R is the shortest distance from the current position to the highway.

Conversely, if R is not on the highway, it is assumed that the shorter of the two distances from both ends Q1, Q2 to P of the highway is the shortest distance L 'from the current position to the highway. The distances L and L 'are obtained by the following equations.

(Equation 1) According to the above distance calculation, the shortest distance from the distance from each highway point to the current position of the vehicle is selected, and the point (R or Q1 or Q2) on the highway at that time is selected.
) Is the correction position of the vehicle.

As shown in FIG. 3, when displaying the expressway network, the range of the expressway network to be displayed is determined by the corrected position A and the traveling direction of the vehicle. Then, the information processing unit 10 extracts nodes and road information related to the expressway within a displayable range from the map information storage device 3, and extracts the screen of the display device 20.
Display at 21. These are expressway exits, service areas and parking areas B. Further, when there is a branch, the driver can give an instruction from the input device and select the road display at the branch destination. Further, as shown in FIG. 3, when displaying the expressway network, the distance from the current position of the own vehicle to the exit of the expressway, the service area, and the parking area B in the traveling direction is displayed. The estimated arrival time and time up to those are displayed.

The method for obtaining each of the above information will be described below.

When calculating the distance, the distance from the corrected position A of the vehicle to the first node is obtained from the node, node information and road information in the traveling direction of the vehicle. Next, the distance between the nodes is added until the exit of the highway, the service area, and the parking area B are detected.
This is performed for all the expressway exits, service areas, and parking areas displayed. The estimated arrival time is obtained by dividing the above obtained distance by the traveling speed. The predicted arrival time is obtained by adding the predicted arrival time to the current time. In the above embodiments, the expressway is described as the specific road. However, the expressway may be a motorway or another toll road.

Further, in the above embodiment, the switching between the general road map and the specific road network is described only in a case where the switching is performed automatically. However, the switching may be performed manually. That is, always
Display switching is not always performed dynamically.

[0019]

As described above, according to the present invention, whether or not a vehicle is traveling on a specific road is determined by using various information. The current position is displayed. If the vehicle is not traveling on a specific road, a general road map and the current position of the vehicle are displayed. For this reason, when the vehicle is traveling on a specific road, the driver can be automatically provided with only necessary information related to the specific road and can easily confirm the information.

According to the present invention, information useful to the driver is displayed by displaying the distance to the exit of the specific road in the traveling direction of the vehicle, the service area and the parking area, and the estimated arrival time and time. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an on-vehicle navigation device of the present invention.

FIG. 2 is a display example of a general road map.

FIG. 3 is a display example of an expressway network.

FIG. 4 shows a shortest distance L from a current position of a vehicle to an expressway.
FIG. 5 is a diagram showing a calculation method of the calculation.

FIG. 5 is a diagram illustrating a calculation method of a shortest distance L ′ from a current position of a vehicle to an expressway.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... GPS receiving device 3 ... Map information storage device 5 ... Input device 7 ... Wireless receiving device 10 ... Information processing part 11 ... Arithmetic processing part (CPU) 13 ... Storage part (memory) 15 ... Input / output signal processing part (Inter Face) 17 Display control unit (display controller) 20 Display device 21 Screen

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-43170 (JP, A) JP-A-3-194417 (JP, A) JP-A-3-138515 (JP, A) 36194 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01C 21/00 G08G 1/0969

Claims (5)

(57) [Claims] 1. Map information of specific roads and general roads is stored.
Storing means, a detecting means for detecting the position of the vehicle, and a detecting means for the detecting means.
The position of the detected vehicle and the information stored in the storage means.
Display means for displaying the map information being displayed, and the vehicle being placed on a general road based on the output of the detection means.
When it is detected that there is a map information of the general road
The storage means is displayed on the display means,
The shortest distance to the specific road read from the column is predetermined
Within this range, and this specific road is in the traveling direction of the vehicle.
And the vehicle speed is equal to or higher than the predetermined speed.
If the road has not been
From the map information of the specified road to the map information of the specific road
Control means for controlling the display means so as to be able to be shown . 2. The vehicle control device according to claim 1, wherein
The shortest distance to the specific road read from the storage means is predicted.
If the specified distance is exceeded, the specified road
Switch from the road map information to the general road map information
Controlling the display means so that display is possible.
The vehicle-mounted navigation device according to claim 1. 3. The method according to claim 2, wherein the control means controls the display to be possible.
The map information of the specific road is the information of the specific road in the vehicle traveling direction.
2. The distance to the facility, according to claim 1,
Car navigation system. 4. The distance is read from the storage means.
That satisfies the shortest distance corresponding to the vehicle position
Information between nodes in the vehicle traveling direction from the position on the road
4. The method according to claim 3, wherein
On-board navigation device. 5. The method according to claim 5, wherein the control means controls the display so that the display is possible.
The map information of the specific road is the information of the specific road in the vehicle traveling direction.
Estimated arrival time to the facility, at least the expected arrival time
3. The method according to claim 1 or 2, wherein
On-board navigation device.