JP3019793B2 - Navigation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an on-vehicle navigation device.

[0002]

2. Description of the Related Art In recent years, map data obtained by digitizing each point on a road on a map is stored in a storage medium such as a CD-ROM, and a certain range including the current position is recognized while the current position of the vehicle is recognized. In-vehicle navigation system has been developed which reads out the map data group of the area from the storage medium, displays it on the display as a map around the current location of the vehicle on the display, and automatically displays the own vehicle position indicating the current location of the vehicle on the map. Is being transformed.

[0003]

When the vehicle travels using such an on-vehicle navigation device, the traveling route data is stored and held, and when necessary, the traveling route is confirmed based on the stored data. It is very convenient because it helps you to follow the same route.

Accordingly, an object of the present invention is to provide an in-vehicle navigation device that displays a driving route on a display in an easily viewable manner and can be used for guidance of directions.

[0005]

According to the first aspect of the present invention,
What is claimed is: 1. A navigation device which recognizes a current position of a vehicle and scrolls and displays a surrounding map together with the current position, comprising: storage means for storing past running trajectories as running route information; and a display command of a running route based on the running route information. And a route display control unit that responds to the display command and displays the map while scrolling the map in a mode of following the travel route based on the travel route information.

Further, an on-vehicle navigation device according to a second aspect of the present invention includes an operation unit for changing a speed of following the traveling route, and the route display control means displays the traveling route in response to an operation of the operation unit. It is characterized by changing the speed of tracing.

[0007]

According to the present invention, it is possible to confirm a traveling route that has traveled in the past and to refer to the route when traveling.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a vehicle-mounted navigation device according to the present invention. In the drawing, reference numeral 1 denotes an azimuth sensor for detecting a traveling azimuth of a vehicle by, for example, terrestrial magnetism (earth magnetic field), 2 denotes an angular velocity sensor for detecting an angular velocity of the vehicle, and 3 denotes a distance sensor for detecting a traveling distance of the vehicle. Reference numeral 4 denotes a GPS (Global Positioni) for detecting an absolute position of a vehicle from latitude and longitude information.
The detection output of each of these sensors (devices) is supplied to the system controller 5.

The system controller 5 has an interface 6 for performing processing such as A / D (analog / digital) conversion to which detection outputs of the respective sensors (devices) 1 to 4 are inputted.
Calculates the traveling distance, traveling direction, current position coordinates (longitude, latitude), etc. of the vehicle based on output data of each sensor (device) 1 to 4 sequentially sent from the interface 6 while performing various image data processing. (Central Processing Circuit) 7 for performing the processing, and a ROM (Read / Write) in which various processing programs of the CPU 7 and other necessary information are written in advance
(Only memory) 8 and a RAM (random access memory) 8 in which information necessary for executing a program is written and read.

As an external storage medium, for example, a CD-ROM as a read-only nonvolatile storage medium, and, for example, a D-type as a writable and readable nonvolatile storage medium
AT (Digital Audio Tape) is used. As an external storage medium, a CD-ROM or DA
Not limited to T, it is also possible to use a non-volatile storage medium such as an IC card.

The CD-ROM previously stores map data obtained by digitizing (digitizing) each point on the road of the map. The stored information is read from this CD-ROM by a CD-ROM driver 10. CD
The read output of the ROM driver 10 is decoded by the CD-ROM decoder 11 and sent out to the bus line L.

On the other hand, the DAT is used as a so-called backup memory, and the recording or reading of information is performed by the DAT deck 12. When the power supply of the vehicle is cut off, information such as the current position coordinates of the vehicle stored immediately before in the RAM 9 is supplied as backup data to the DAT deck 12 via the DAT encoder / decoder 13 and stored in the DAT. When the power is turned on, the DAT storage information is read by the DAT deck 12. The read information is a DAT encoder /
The data is transmitted to the bus line L via the decoder 13 and is stored in the RAM 9.

The turning on and off of the vehicle power is detected by a detection circuit 14 which monitors the output level of a so-called accessory switch SW of the vehicle.

The vehicle power from a battery (not shown) via the accessory switch SW is stabilized by the regulator 15 and supplied as power to each section of the apparatus.

The output voltage of the regulator 15 does not fall instantaneously when the accessory switch SW is turned off due to the time constant of the circuit, and backup data is stored in the DAT as a backup memory during the fall. become.

When the vehicle is running, the CPU 7 calculates the azimuth of the vehicle based on the output data of the azimuth sensor 1 at a predetermined cycle by a timer interrupt, and executes an interrupt for each constant mileage based on the output data of the distance sensor 3. The current position coordinates of the vehicle are obtained from the traveling distance and the traveling direction, and map data of a certain area including the current position coordinates is stored in a CD-RO.
M, and temporarily collects the collected data in the RAM 9 as a buffer memory.
To supply.

The display device 16 renders a display 17 such as a CRT, a graphic memory 18 such as a V (Video) -RAM, etc., and maps data sent from the system controller 5 on the graphic memory 18 as image data. A display controller 20 controls the display of the map on the display 17 based on the image data output from the graphic controller 19 that outputs the image data.

The input device 21 is provided by a trajectory key for giving a display command of a traveling locus as a traveling route, a keyboard including a speed UP key and a DOWN key for instructing acceleration and deceleration of a display speed for following the traveling locus displayed as the traveling route. In other words, various commands such as a display command of the driving route and a command to accelerate or decelerate the display speed following the driving route are issued to the system controller 5 by a key input by the user.

Next, the processing procedure of collecting travel locus data as travel route information executed by the CPU 7 will be described with reference to the flowchart of FIG.

This subroutine reads a map data group of a certain area including the current position from the CD-ROM while recognizing the current position of the vehicle every time the vehicle travels a predetermined distance da, and displays the map data as a map around the current position of the vehicle on the display 17. It is called and executed at a predetermined timing during the execution of a main routine (not shown) for displaying the vehicle position indicating the current position of the vehicle on the map while displaying it on the map.

The CPU 7 first determines whether or not the vehicle has traveled a fixed distance db (≧ da) based on the output data of the distance sensor 3 (step S21). The point coordinates of the current position obtained by the current position recognition and the point data group such as the map number including the coordinates are stored in the address area designated by the write address pointer of the ring buffer in the RAM 9 as the traveling route information storage means ( (Step 22) Then, the write address pointer is advanced by one data group (Step S)
23).

By repeating this process every time the vehicle travels a predetermined distance db, a number of point data groups corresponding to the storage capacity are sequentially stored in the ring buffer as travel trajectory data. When it exceeds, the running locus data is updated to the new running locus data in order from the old running locus data.

When storing the traveling locus in the ring buffer, the traveling locus data may be sequentially stored in all the storage areas of the ring buffer, or the start address and the end address of a specific area of the ring buffer may be stored. The travel locus data may be stored in an area specified by the delimiter pointer and sequentially defined by the delimiter pointer.

Next, a procedure for displaying a traveling route, which is executed by the CPU 7 when an instruction to display the traveling route is made by a key input on the input device 21, will be described with reference to the flowchart of FIG.

In response to a key input command from the input device 21, the CPU 7 first sets a read address pointer to an address at which, for example, a starting point data group of the traveling route is stored (step S31). Is read from the ring buffer (step S32), a map data group of a certain range of area centered on the point coordinates based on the read point data group is obtained from the buffer memory (for example, the graphics memory 18), and the map and the point are obtained. The display device 16 is controlled to display the coordinates on the display 17 with the cursor (step S33), and then the read address pointer is advanced by one data group (step S34).

Subsequently, the CPU 7 determines whether or not the read address pointer matches the write address pointer (step S35). If the two pointers do not match, the next read address pointer matches with the preceding delimiter pointer. It is determined whether or not (step S36).

If the read address pointer does not match the write address pointer and the delimiter pointer, it means that the display of the travel route has not been made to the final travel point, and the apparatus waits for a predetermined time in the standby mode (step S).
37) Then, the program proceeds to step S32. The reason for waiting for a predetermined time in the standby mode in step S37 is to scroll the map in the cycle of the time, and the processing procedure in this standby mode will be described later.

By repeating the above processing, the point data group is sequentially read from the ring buffer, and the map is displayed on the display 17 in the standby mode in step S37 so that the coordinate position of the point according to the point data group is centered. The traveling route is displayed by scrolling at the cycle set by.

If the read address pointer matches the write address pointer or the delimiter pointer, it means that the display of the travel route has been made to the final travel point, and the CPU 7 performs a series of operations for displaying the travel route. Is completed.

Next, the processing procedure of the above-mentioned standby mode will be described with reference to the flowchart of FIG.

The CPU 7 first sets an initial value in a timer counter (step S41), and then sets the input device 21
It is determined whether there is a key input for instructing acceleration or deceleration of the display speed following the travel route from (step S4)
2).

If there is a key input for instructing acceleration or deceleration, the CPU 7 increases or decreases the initial value of the timer counter by an amount corresponding to the input time, for example, the input time (step S43), and then waits for a unit time. (Step S44).

If there is no key input for commanding acceleration or deceleration, the program proceeds directly to step S44. After waiting for the unit time, the CPU 7 counts down the count value N of the timer counter by "1" (step S5).
45) Then, it is determined whether or not the count value N is 0 (step S46). If N ≠ 0, the program returns to step S42. If N = 0, the program returns to step S32 in FIG. Return.

According to the processing in the standby mode, a command for accelerating or decelerating the display speed is given by a key input on the input device 21, thereby changing the scroll cycle of the map when displaying the traveling route and following the traveling route. The display speed can be set freely.

In the above embodiment, the point data groups are read out in the order stored in the ring buffer as the traveling locus data, and the traveling route is displayed in such a manner that the traveling route is traced from the start point to the end point. By setting the read address pointer to the end point address and returning the read address pointer by one data group in step S34, the point data group is read in the reverse order of the storage order, and the traveling route is moved from the end point to the start point. It is also possible to display in a tracing manner.

[0036]

According to the present invention, it is possible to confirm a traveling route that has traveled in the past and to refer to the route when traveling.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating a processing procedure for collecting a traveling locus.

FIG. 3 is a flowchart showing a processing procedure for displaying a traveling route.

FIG. 4 is a flowchart illustrating a processing procedure in a standby mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Orientation sensor 2 ... Distance sensor 5 ... System controller 10 ... CD-ROM driver 16 ... Display device 17 ... Display

 ──────────────────────────────────────────────────続 き Continuing from the front page Judge Takashi Murayama Judge Yutaka Kihara Judge Akiyoshi Sato (56) References JP-A-63-184010 (JP, A) JP-A-62-111398 (JP, A) JP JP-A-63-91512 (JP, A) JP-A-63-113800 (JP, A)

Claims (2)

(57) [Claims] 1. A navigation device for recognizing a current position of a vehicle and scrolling and displaying a surrounding map together with the current position, wherein a storage means for storing a past traveling locus as traveling route information; Display command means for displaying a travel route; and route display control means for responding to the display command and displaying the map while scrolling the map in a mode of following the travel route based on the travel route information. Navigation device. 2. An operation unit for changing a speed of following the travel route, wherein the route display control means changes a speed of following the travel route in accordance with an operation of the operation unit. The navigation device according to claim 1.