JPH10318765A - Vehicle-mounted navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a safe operation without any need for manual operation by automatically displaying an enlarged map around an intersection where a vehicle tries to bend from its driving state when it approaches the intersection. SOLUTION: A storage medium reading device 4 reds a map database 3 where a plurality of types of map data with a different scale are recorded for a same region and desired map data from the map database. An image- processing device 7 displays the map of a region being selected based on map data that are read by a memory 5 for storing the map data and the storage medium reading device 4. An own vehicle position processing device 2 detects the position of a vehicle and a direction instruction detection device 6 detects the indication direction of a direction indicator. Then, the controller operates the storage medium reading device 4 according to signals from the own vehicle position processing device 2 and tan operation part 9, displays a selected map and the position of the vehicle on the image-processing device 7, performs a judgment, for example, from data regarding own vehicle position, speed, and velocity from the device 2, and automatically displays the enlarged map of a front intersection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle navigation device, and more particularly to an on-vehicle navigation device for displaying an enlarged map around a front intersection on a normal scale map.

[0002]

2. Description of the Related Art In-vehicle navigation devices for displaying the position of a vehicle on a map screen are well known. In a conventional in-vehicle navigation device, when a route from a departure point to a destination is set by a route search unit, or when an intersection to be turned on a route is set by manually inputting, a turn on the set route should be performed. The enlarged map around the intersection is displayed only when the vehicle enters a certain range of the intersection.

[0003]

In the above-described conventional on-vehicle navigation device, it is necessary to set a route from the departure point to the destination by some method and to guide the route, and the vehicle travels on the set route. The enlarged display around the intersection is automatically performed only when the vehicle is traveling.

However, when the driver tries to turn at an intersection other than an intersection on the path set by the driver while the vehicle is traveling, if the driver wants to see an enlarged map around the intersection before turning, the driver must perform a manual operation. . Performing such an operation during traveling distracts the driver's attention and may cause an accident.

The present invention has been made in view of the above points, and has as its object to reduce the distance from the front intersection, the traveling speed or the acceleration, without requiring the driver to perform manual operation. It is an object of the present invention to provide an in-vehicle navigation device that automatically displays an enlarged map around an intersection based on a direction indication.

[0006]

According to the present invention, there is provided an on-vehicle navigation device comprising: a map database in which a plurality of types of map data of different scales are recorded for the same area; and a record for reading desired map data from the map database. A medium reading device, a memory for storing the map data, a video processing device for displaying a map of a region selected based on the map data read by the recording medium reading device, and a vehicle position for detecting the vehicle position A processing device, a direction indication detection device that detects an indication direction of a direction indicator, and a signal from the host vehicle position processing device and the operation unit to operate the recording medium reading device, and the selected map and the host vehicle position are displayed. In an in-vehicle navigation device having a controller for displaying on a video processing device, an on-vehicle navigation device is provided. Position, it is determined from the signal from the data and the direction instruction detecting device on the velocity or acceleration is to automatically display the enlarged map of the forward intersection.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An on-vehicle navigation device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a vehicle-mounted navigation device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a main controller composed of a microcomputer or the like, which controls the entire apparatus.

Reference numeral 2 denotes an own-vehicle position processing device, which includes an autonomous navigation sensor 2a such as a speed sensor and a direction sensor, a GPS (global positioning, system) receiver 2b, and an own-vehicle position calculating device 2c. Calculation is performed and the data is output to the main controller 1.

The map database 3 is composed of a CD-ROM or the like, and stores a plurality of types of map data of different scales for the same area. The recording medium reading device 4 reads map data of an area designated by the main controller 1 from the map database 3 and supplies the map data to the main controller 1. The main memory 5 stores a plurality of types of map data supplied from the main controller 1 and having different scales.

The direction indication detecting device 6 determines a direction indication state based on a signal from the direction indicator, and outputs a signal indicating the direction indication to the main controller 1. The video processing device 7
It comprises a graphic controller 7a, a video RAM 7b and a display device 7c.

The graphic controller 7a develops and stores map screen data calculated from the map data by the main controller 1 in the video RAM 7b, and displays the map screen data in the RAM 7b on a display device 7c such as an LCD.

The voice output device 8 outputs a voice guide message as appropriate according to a command from the main controller 1. The operation unit 9 includes a key or a remote controller, performs initial settings such as a current position and a destination before using the apparatus, and activates the apparatus.

[0013] The navigation device for a vehicle having the above-described structure includes:
After startup, a map screen including the own vehicle position calculated by the own vehicle position processing device 2 is normally displayed on the display device 7c together with the own vehicle position as shown in FIG.

When the driver decelerates to turn at the next intersection and operates the turn signal, an enlarged map around the intersection in front of the vehicle is displayed on a normal scale map as shown in FIG. You.

FIG. 4 shows an operation when an enlarged map around an intersection is automatically displayed. Step S1 is executed at regular intervals from a normal display state (START) as shown in FIG. 3 to determine whether or not the intersection is within a specified range. If the intersection is not within the specified range, the display returns to the normal display state (START), and if the intersection is within the specified range, the process proceeds to step S2.

In step S2, it is determined from the data from the host vehicle position calculation device 2c whether or not the acceleration of the host vehicle is a negative value or more than a specified value. If not, the normal display state (START) Returning to step S3, if it is equal to or greater than the specified value, the process proceeds to step S3.

In step S3, it is determined from the data from the own-vehicle position calculating device 2c whether or not the speed of the own vehicle is within a specified value.
TART), and if within the specified value, step S
Move to 4.

In step S4, it is determined whether or not a direction is instructed by the direction indicator. If the direction is not instructed, the display returns to the normal display state (START). If the direction is instructed, step S5 is performed. Move to

In step S5, as shown in FIG. 2, an enlarged map around the intersection is displayed on a normal reduced-scale map. This display is continued until the vehicle position moves away from the intersection by a certain distance, and when the vehicle moves by a certain distance, the display returns to the normal display state (START).

Although the embodiment is constructed as described above, the invention is not limited to this. For example, the conditions for displaying an enlarged map around an intersection are determined based on the distance from the intersection, the speed of the own vehicle, and the presence or absence of a direction instruction. Is also good. Alternatively, the determination may be made based on the distance from the intersection and the presence or absence of a direction instruction.

[0021]

According to the on-vehicle navigation device of the present invention, an enlarged map around the intersection where the vehicle is about to turn automatically is displayed from the running state of the vehicle when approaching the intersection. This eliminates the need for manual operation when the user wants to view an enlarged map around the intersection other than the above, and has the effect of enabling safe driving.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing an example of a display screen of the on-vehicle navigation device.

FIG. 3 is a diagram showing another example of a display screen of the on-vehicle navigation device.

FIG. 4 is a flowchart showing the operation of the on-vehicle navigation device.

[Explanation of symbols]

Reference Signs List 1 main controller 2 own vehicle position processing device, 2a autonomous navigation sensor, 2b
GPS receiver, 2c own vehicle position calculation device 3 Map database 4 Recording medium reading device 5 Main storage memory 6 Direction detection detection device 7 Image processing device, 7a Graphic controller, 7
b Video RAM, 7c Display device 8 Audio output device 9 Operation unit

Claims (1)

[Claims] 1. A map database in which a plurality of types of map data of different scales are recorded for the same area, a recording medium reading device for reading desired map data from the map database, and a memory for storing the map data. A video processing device that displays a map of a region selected based on the map data read by the recording medium reading device, a vehicle position processing device that detects a vehicle position, and a pointing direction of a direction indicator. In-vehicle navigation comprising a direction indication detecting device, and a controller for operating the recording medium reading device in response to signals from the host vehicle position processing device and an operation unit, and displaying the selected map and host vehicle position on the video processing device. In the device, the data and the direction instruction detection relating to the vehicle position, speed or acceleration from the vehicle position processing device are provided. An in-vehicle navigation device characterized by automatically displaying an enlarged map of an intersection in front of the vehicle, based on a signal from an output device or the like.