JPH02238317A - Navigation apparatus for vehicle - Google Patents

Abstract

PURPOSE:To certainly correct the present position of one's own car by simple operation by providing a position correcting means for altering the present display position of a vehicle on map data at the position of the nearest crossing corresponding to correction indication. CONSTITUTION:When correction indication is issued, that is, when a setting switch 9 is pressed, processings S2, S3 are executed and one's own car P on a map picture is forcibly moved to the nearest crossing 11 and the present position thereof is corrected. After the processing S3 is executed, said processing returns to the processing S1 to become loop operation and, as a result, at each time when the correction indication is issued, the present position of one's own car P is successively moved to the position of the nearest crossing to be corrected. That is, at each time when the setting switch 9 is pressed, one's own car P is successively moved from a crossing I1 to a crossing I2 and from the crossing I2 to a crossing I3 to reach the crossing position nearest to each of the crossings and the present position thereof is corrected.

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention superimposes and displays the current position of a vehicle obtained by dead reckoning navigation etc. on pre-prepared map information to guide the traveling of the vehicle. The present invention relates to a vehicle navigation device.

<<Prior Art>> A so-called vehicle navigation device that superimposes and displays the current position of the own army on pre-prepared map information and guides the movement of the own army has conventionally been disclosed in, for example, Japanese Patent Laid-Open No. 61-209.
It is disclosed in Japanese Patent Application No. 316, etc., and is well known. Such vehicle navigation devices use dead reckoning, which performs positioning (estimation) based on the distance and direction of the vehicle from a reference point, and global positioning, which performs positioning by receiving radio waves from satellites. The vehicle's current location is determined through satellite navigation using the Positioning Satellite System (GPS).

However, in this case, although the magnitude varies depending on the accuracy of the positioning method used, it is unavoidable that errors (positioning errors) occur due to positioning, and due to the accumulation of positioning errors, the position on the map and the current position of the army This may cause a large discrepancy in the map, and there is a risk that the own army will be displayed in a clearly different position on the map compared to the buildings and other identifying objects visible outside the vehicle.

For this reason, vehicle navigation devices are generally configured so that the current position of the own troops can be arbitrarily corrected manually.In other words, by operating a movement instruction switch, the own troops on the display screen can be moved in both vertical and horizontal directions. It was equipped with a position correction function that changed the current position of the own army and set a new one, thereby correcting positional deviations.

《Problem to be solved by the invention》 However, with the above-mentioned position correction function, although it is possible to move the current position of your army to any point on the map information by operating the movement instruction switch, conversely speaking, the display screen It was necessary to precisely align the upper army to a new point by operating a movement instruction switch, and there was a problem in that the operation was surprisingly complicated and time-consuming. In particular, correction of the current position is often performed at intersections where the actual position can be easily confirmed while waiting for a traffic light, etc. Therefore, there has been a demand for improved operability.

The present invention has been made in view of the above-mentioned background, and an object of the present invention is to provide a vehicle navigation device that can reliably correct the current position of a vehicle with a simple operation, that is, has good operability in correction work. is its purpose.

<<Means for Solving the Problems>> The present invention provides a method for determining the current position of a vehicle obtained by dead reckoning navigation or the like.
In a vehicle navigation device that superimposes the display on pre-prepared map information and changes the display position in response to a correction instruction, the current display position of the vehicle is displayed in response to a correction instruction as the closest intersection position on the map information. It is characterized by comprising a position correction means for changing the position.

<<Operation>> With the above configuration, when a correction instruction is issued, the current position of the vehicle is changed to the closest intersection position on the map information by the position correction means.

In other words, the current position of the vehicle can be reliably corrected to the nearest intersection position by simply issuing a correction instruction.

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

FIG. 1 is a configuration diagram showing a preferred embodiment of a vehicle navigation device according to the present invention.

This vehicle navigation device uses a compact disc (CD) in which map information such as road maps is stored in advance in a controller 1 consisting of a so-called control computer.
)2, and a CRT 4 that displays an image with the current position of the vehicle superimposed on map information.
G receives radio waves from satellites and determines the current position of its own troops.
A PS receiver 5, a vehicle speed sensor 6 that outputs a detection signal according to the vehicle speed to calculate the distance traveled by the own vehicle, and a left rear wheel RL and a right rear wheel RR to calculate the traveling direction of the own vehicle. A wheel rotation sensor 7 that detects the rotation of each vehicle wheel and outputs a signal, a geomagnetic sensor 8 that detects the running direction of the own troops, and a setting switch 9 that gives a correction instruction to the position correction function according to the present invention. Under the control of the controller 1, the current state of the own vehicle is determined by satellite navigation using the GPS receiver 5, or dead reckoning navigation using a combination of the vehicle speed sensor 6 and the geomagnetic sensor 8, or the vehicle speed sensor 6 and the wheel rotation sensor 7. Measure the position, superimpose it on the map information from the CD2 sent from the CD driver 3, and display it on the CRT.
4 to guide the movement of the own army.

FIG. 2 is a flowchart schematically showing a portion (subroutine) related to the position correction function in the control program of the controller 1. In other words, this vehicle navigation device is equipped with a so-called position correction function that allows the current position of the own troops to be corrected by manual operation, and in this embodiment, the position correction function is a subroutine shown in FIG. This subroutine is executed by operating the controller 1 according to this subroutine.

This subroutine, that is, the position correction function, loops this processing S1 until the setting switch 9 is pressed, that is, until a correction instruction is issued.

However, this loop state is canceled when a correction instruction is issued, and in the next process S2, a search is made for the intersection closest to the current position of the own army. This search is performed within a predetermined search range centered around the current location of the vehicle, and if there is no intersection within the search range, the search is performed several times by sequentially expanding the search range. However, there is an upper limit to the expansion of the search range. Also, the coordinate data of the intersections involved in such a search are naturally stored in the CD 2 and read into the controller 1 from the CD driver 3.

Then, in process S3, the intersection obtained by the above search is set as the new current position of the own army, that is, the current position of the own vehicle is forcibly changed to the intersection position closest to it, and then the process returns to process S1, and a loop operation is performed. Become.

FIG. 3 shows an example of a map screen displayed on the CRT 4, and is a schematic diagram for explaining the operation of the subroutine shown in FIG.

That is, according to such a configuration, when a correction instruction is issued, that is, when the setting switch 9 is pressed, processing S2 and processing S3 are executed, and the own vehicle P on the map screen is moved to the nearest intersection (1). It is forcibly moved and its current position is corrected. After executing the process S3, the process returns to the process S1 and operates in a loop, so that each time a correction instruction is issued, the current position of the own vehicle P is sequentially moved and corrected to the nearest intersection position. In other words, each time the setting switch 9 is pressed, the vehicle P moves from the intersection l1 to the intersection I2.
The vehicle is sequentially moved from intersection ■2 to intersection ■3 to the closest intersection position, and its current position is corrected.

Therefore, by simply pressing the setting switch 9, the current position of the own troops can be reliably corrected to the nearest intersection position, and the operability of the correction work can be favorably improved.

As mentioned above, correction of the current position is often carried out at intersections where it is easy to confirm the actual position while waiting for a traffic light, etc. In such a case, simply pressing the setting switch 9 will correct the current position. The present invention, which allows for correction work, has very good operability and is highly effective.
0 By the way, FIG. 4 is a conceptual diagram illustrating control of the map screen by the controller 1.

In this vehicle navigation device, map information stored in the CD 2 is read into the controller 1 from the CD driver 3 and displayed on the screen on the CRT 4.
As shown in the figure, even if the CRT 4 is currently displaying the map information area ■, the area
A total of eight areas surrounding area (2) are read, so to speak, a peripheral area group for area (2) is constructed. When the own vehicle P moves to any of the outer area groups, the screen display scrolls to the movement area (area ■ in FIG. 4), and the outer area group for that area is then stored in the controller 1. Read control is performed to construct.

In other words, when the CRT4 screen display scrolls and switches from area ■ to area ■, areas ■, ■, ■
Discard it and create a new area [phase]. Control is performed to read 03@.

This is intended to create a group of peripheral areas for the currently displayed area in the controller 1 in advance, and to process scrolling and the like at high speed.

However, in the above map information reading control, own vehicle P
If an outer peripheral area group was constructed for each area when scrolling as the area moves, reading from the CD driver 3 would become frequent, which would interfere with other controls other than the reading control in the controller 1. Therefore, even if the vehicle P moves to an area, the outer area group for that area is not immediately constructed, and the outer area group that the own vehicle P is currently reading into the controller 1 is located on the outer side. In cases where there is a high possibility of moving to a nearby area and leaving the outer area group, or when the friendly force P stays in any of the outer area groups for a predetermined period of time or more, the outer area group for the area in question is changed. This is a newly constructed control, and the reading control with hysteresis is performed for the amount of movement of the vehicle P on the outer area group that is currently being read and the elapsed time after movement, thereby making the above intersection search more efficient. I am able to do it well.

<<Effects of the Invention>> As described above in detail in the embodiments, the vehicle navigation system according to the present invention. According to the present invention, when a correction instruction is issued, the current position of the vehicle is repositioned by the position correction means to the nearest intersection position on the map information. In other words, the current position of the vehicle can be reliably corrected to the nearest intersection position by simply issuing a correction instruction. This results in
The operability of correction work at intersections where there is a high demand for correction work can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a vehicle navigation device according to the present invention, FIG. 2 is a flowchart of a portion of the control program related to the position correction function, and FIG. 3 is a schematic diagram illustrating the operation of the subroutine shown in FIG. 2. FIG. 4 is a conceptual diagram illustrating control of the map screen. P... Vehicle (own army) 11, 12.13... Intersection 1.9...
・・・・・・Position correction means (controller, setting switch) Figure 2, Figure 4

Claims (1)

[Claims] In a vehicle navigation device that superimposes and displays the current position of a vehicle obtained by dead reckoning navigation etc. on pre-prepared map information and changes the display position in response to a correction instruction, A navigation device for a vehicle, comprising a position correction means for changing the current display position to the closest intersection position on map information.