JPH025245B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current position display device for a moving body such as an automobile, which displays the moving status of the moving body, such as the current position, movement trajectory, and direction of movement.

In general, when driving a car at night or in an unfamiliar area, a system that provides appropriate guidance to prevent the driver from deviating from the planned driving course and getting lost, the driver's car is shown on a preset road map. BACKGROUND ART A current position display device for a moving object has been developed that displays the movement status such as the current position, movement trajectory, and direction of movement.

Conventionally, in this type of current position display device for a moving object, a distance detector detects the distance traveled by the vehicle according to the vehicle speed, and a direction detector detects the direction of travel of the vehicle and the amount of change thereof. Then, calculate the current position of the vehicle on the travel route from each of these detected values, store the result in a storage device, and display it on the display screen as continuous point information that changes every moment. The driver can confirm the current location by comparing the displayed content with a transparent sheet-like road map set in advance on the display screen.

However, with such conventional current position display devices for moving objects, when stopping the engine when parking while driving, it is difficult to prevent the battery from being over-discharged due to the engine being stopped for a relatively long period of time. In order to do this, when the engine is stopped, the power to the current position display device is also turned off at the same time, but when the power is turned off, the data such as the movement trajectory and current position that has been stored in the storage device until then is deleted. As a result, the start position and direction of travel must be initialized again on the display screen before the vehicle starts running, which is complicated.

The present invention has been made in consideration of the above points, and
The map is set in advance by converting the map into digital information pixel by pixel in raster mode and storing it in a storage medium, and prior to driving, map information of the area to be traveled is read from the storage medium and displayed on the screen. In addition to making it easy to use, especially when the power is turned off in the middle of driving, it is possible to check the movement trajectory and current position.
A device for displaying the current position of a mobile object that can continuously display the movement status without losing data on the traveling direction or map information of the initially set driving area. It provides:

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the current position display device for a moving object according to the present invention is a moving body comprising a photoelectric, electromagnetic, or mechanical contact type sensor that outputs a pulse signal proportional to the number of tire rotations. Distance detector 1 that generates a signal according to the distance traveled by the body
and a direction detector 2 that outputs a signal proportional to the direction or change in direction of the moving body depending on the direction of movement of the moving body, which is composed of a rate-type gyroscope that detects the angular velocity in the yaw direction, for example, and A map information storage medium 3 in which map information digitalized in units of pixels is stored according to a predetermined address, a storage medium reproducing device 4 that reads necessary map information from the storage medium 3, and the distance detection device The moving distance of the moving object is measured by counting pulse signals from the detector 1, and the moving direction of the moving object is determined from the output of the direction detector 2. A signal processing unit (CPU) 5 that performs central control of the entire device and momentary changes determined by the signal processing unit 5 calculates the position on two-dimensional coordinates for each unit traveling distance of . It sequentially stores position data on two-dimensional coordinates to store information on the current position and movement trajectory, and also stores information on the moving direction of the mobile object at the current position while updating it sequentially, and stores a map of the area where it is scheduled to travel. A non-volatile memory device (RAM) that stores address information for
6, displaying a map image on the screen according to the map information read from the storage medium 3;
Based on the position data stored in the storage device 6, the display device 7 displays the current position of the moving object, the trajectory of movement up to that point, the current direction of travel, etc. on the same screen every moment, and a display command is given to the signal processing device 5. In addition to specifying the address for selecting the map to be displayed on the display device 7, changing the direction of the displayed map and the trajectory, shifting the display position, enlarging a portion of the map and the trajectory, selecting the display scale, etc. It is comprised of an operating device 8 that can appropriately change display format settings, search for maps and travel trajectories, and the like.

The operation of the current position display device for a moving body according to the present invention configured as described above will be explained below.

First, when a moving object such as a car is traveling, when the driver uses the operating device 8 to specify the address of a map in the area in which the driver is scheduled to travel, such as by specifying a map number, a signal is generated in response to the address specification input for the map selection. The processing device 5 reads the map information in a predetermined memory block from the map information storage medium 3 via the storage medium playback device 4, and sends the read map information to the display device 7 to display a map of the planned driving area on the screen. Display. At this time, the signal processing device 5 stores address information for map selection in the storage device 6, stores the map information read from the storage medium 3 in an internal video RAM, and constantly reads map information from the RAM. By reading out the map and applying it to the display device 7, a predetermined map is continuously displayed on the screen of the display device 7. In addition, as a means of accessing the map to be displayed on the screen, key operations on the operating device 8 may be used to sequentially display maps of multiple regions stored in the map information storage medium 3 on the display device 7 while accessing the map in the planned driving area. Needless to say, it is possible to take appropriate measures such as having the user select a map to display.

Next, by key input from the operating device 8,
After displaying the current position display mark and the direction display mark indicating the moving direction of the moving object at the current position on the screen of the display device 7, the operating device 8
Shift the current position display mark to the starting point position on the displayed map by operating the switch, and rotate the direction display mark so that it matches the moving direction of the moving object at the starting point to initialize each display mark. have them do it. However, if a device capable of detecting the absolute direction, such as a geomagnetic compass, is used as the direction detector 2, it is not necessary to initialize the direction display mark M2 as described above.

After that, when the moving object starts running, one pulse signal is sent from the distance detector 1 for each unit distance traveled to the signal processing device 5, and the distance traveled is measured by counting the number of pulses there. At the same time, the output of the direction detector 2 is also sent to the signal processing device 5, where the moving direction of the moving body at every moment is determined. In the signal processing device 5,
Based on the travel distance and change in direction of the moving object detected as described above, the current position (x, y) on the X-Y coordinates is calculated according to the preset map scale. The data on the current position of the moving body determined moment by moment is sequentially sent to the display device 7 and also sent to the storage device 6 where it is stored and held. Note that the written content is always read out and continuously sent to the display device 7. At the same time, a direction signal at the current position is sequentially sent from the signal processing device 5 to the display device 7, and the direction information is stored in the storage device 6 while being updated sequentially. As shown in FIG. 2, for example, the display device 7 has a display mark M1 indicating the current position of the mobile object on the travel schedule map displayed on the screen, and a display mark M1 indicating the traveling direction of the mobile object at the current position. The display mark M2 shown and the movement locus display mark M3 from the starting point to the current position are displayed in a simulated manner following the movement state of the moving body.

With the current position display device for a moving object according to the present invention, even if the engine is stopped for temporary parking while the moving object is traveling and the power to the current position display device is turned off, the current position display device can still display the area in which the moving object is scheduled to travel. Map address information, previous movement trajectory and current location,
Each piece of information regarding the direction of travel is stored in a non-volatile storage device 6, and when the engine is restarted and the power is turned on when the moving object is restarted, the map and the moving object immediately before the power is turned off are displayed on the screen of the display device 7. The movement status of the vehicle is displayed, and the movement status of the planned travel area can be continuously displayed on the map.

Furthermore, the invention of the present application stores the address information of the map in the area where the vehicle is scheduled to be traveled in a non-volatile manner in the storage device 6 in advance, so that the mobile object can be operated regardless of whether the power is turned off or turned on again during the guidance. As the movement progresses, the address information stored in the storage device 6 is sequentially read out and a predetermined map is displayed on the screen while being updated, thereby providing continuous driving guidance for the moving object. It becomes something that can be effective.

Further, FIG. 3 shows a specific example of the configuration of a current position display device for a moving body according to the present invention.

In this configuration, the signal processing device 5 includes a main CPU 51 for performing arithmetic processing and centralized control, and a clock signal from a clock generation circuit 57 by decoding the contents instructed by the main CPU 51. A timing and address control circuit 52 generates timing signals for controlling each part in synchronization with the control output, and a predetermined control program stored in advance is read out according to its control output, and the data is sent to the main CPU 51 for control purposes.
The ROM 53 stores continuous position data on the two-dimensional coordinates of the moving object according to the distance detection value and direction detection value and address information for map selection input from the operating device 8, and also detects the direction at the current position. a RAM 54 that stores values while updating them sequentially (in this case, the storage device 6 is provided inside the signal processing device 5);
It consists of a video RAM 55 that temporarily stores current position display marks, direction display marks, movement trajectory display marks, and map image information, and a parallel input/output and interrupt control circuit 56 that connects the main CPU 51 with the outside. Also,
The rate output of the direction detector 2 is converted into a digital value by the AD converter 9 and given to the data bus DATA BUS of the signal processing device 5.
The pulse signal output is sent to a timing and address control circuit 52 and counted by an internal counter. Further, a detector 10 is provided to detect whether the moving body is moving forward or backward, and when the moving body is moving backward, the detection signal is sent to the parallel input/output and interrupt control circuit 56, and from the distance detector 1 and direction detector 2 between them. Each input is corrected. The operating device 8 is also provided with a switch encoding CPU 11 that reads the input states of the operating input switches and provides various command signals to the parallel input/output and interrupt control circuit 56.

As described above, the current position display device for a moving object according to the present invention includes a distance detector for detecting the moving distance of the moving object, a direction detector for detecting the direction accompanying the movement, and a device for displaying the current position of a moving object in which map information is stored in advance at a predetermined address. a digitized map information storage medium stored in accordance with the above, a storage medium playback device that reads necessary map information from the storage medium, and a digitized map information storage medium that reads out necessary map information from the storage medium; A signal processing device that calculates the position of A non-volatile storage device that stores information on the moving direction of the moving object while being updated sequentially and also stores address information of a map in the area where the moving object is scheduled to travel, and a map image that is stored in accordance with the map information read from the storage medium. A display device that displays the movement status of a moving body on the same screen as a mark based on information stored in the non-volatile storage device, and a map selection designation and mark display that is displayed on the display device. It is configured with an operating device that allows initial settings to be made, and can easily display a map of the area where the vehicle is scheduled to travel on the screen of the display device, and can accurately display the state of travel on the map. In particular, it has an excellent advantage in that even if the power is temporarily turned off during traveling, the data necessary for display can be stored and retained, and the current position of the moving body can be continuously displayed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the current position display device for a moving body according to the present invention, FIG. 2 is a diagram showing an example of display contents on the display device of the same embodiment, and FIG. FIG. 2 is a block diagram showing a specific example of a circuit configuration. 1... Distance detector, 2... Direction detector, 3...
Map information storage medium, 4...Storage medium playback device, 5
...Signal processing device, 6...Non-volatile storage device,
7...Display device, 8...Operation device.

Claims (1)

[Claims] 1 a distance detector that detects the moving distance of a moving object;
A direction detector that detects the direction of movement; a map information storage medium that stores digitized map information in accordance with a predetermined address; and a storage medium that reads necessary map information from the storage medium. a reproduction device, a signal processing device that determines the position of the moving object on two-dimensional coordinates based on the output of each of the detectors, and data on the position on the two-dimensional coordinates that changes every moment as determined by the signal processing device. A non-volatile memory that sequentially stores information on the current position and movement trajectory, sequentially updates and stores information on the moving direction of the moving object at the current position, and stores map address information in the area where the moving object is scheduled to travel. Displaying a map image on a screen according to the map information read from the storage device and the storage medium, and marking the movement state of the mobile object on the same screen based on the information stored in the nonvolatile storage device. A current position display device for a moving object, which includes a display device for displaying images and an operation device for selecting and specifying a map to be displayed on the display device and initializing a mark.