JPH0236952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving route display device for displaying driving conditions such as a current position, a driving trajectory, and a traveling direction of an automobile or the like.

In general, when driving at night or in unfamiliar areas, a road map is installed in the driver's seat in advance to provide appropriate guidance so that the driver does not deviate from the planned course and get lost. A device has been developed that displays information such as the current location.

Conventionally, in this type of travel route display device,
The distance detection section detects the distance traveled by the vehicle according to the vehicle speed, and the direction detection section uses a rate-type gyroscope to detect the angular velocity of changes in the yaw direction. The current position of the vehicle on the travel route is calculated from each detected value, and the result is displayed on the road map as point information that changes every moment.

However, in such conventional driving route display devices, detection errors due to drifts of automobiles accumulate, and point information indicating the current position displayed on a map with a complex and close-knit road network is There is a high possibility that the vehicle will deviate from its current course and display its current position on a different road, and the driver will not be able to distinguish between whether the error is due to an error in the device or whether the vehicle is traveling on the wrong course. , it has become very confusing.

The present invention has been made in consideration of the above points, and
In addition to displaying the current location using point information as in the past, the road map also continuously displays the travel trajectory of the vehicle within a certain section from the fixed location to the current location and the direction of travel at the current location. Even if the current position on the map deviates from the predetermined course due to the above-mentioned detection error, it is possible to determine which road the vehicle is currently traveling on by comparing the travel trajectory up to that point with the road shape on the map. It is an object of the present invention to provide a driving route display device that can be easily operated.

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

FIG. 1 shows the basic circuit configuration of the driving route display device according to the present invention, which is composed of a photoelectric type, electromagnetic type, or mechanical contact type sensor that outputs a pulse signal proportional to the number of tire rotations. A distance detector 1 that generates a signal according to the direction of the vehicle, and a rate type gyroscope that detects the angular velocity of yaw change, etc., outputs a signal proportional to the direction or the amount of change in direction depending on the direction of travel of the vehicle. The distance detector 2 counts the pulse signals from the distance detector 1 to measure the traveling distance of the vehicle, and determines the traveling direction of the vehicle from the output of the direction detector 2. A signal processing unit (CPU) 3 that calculates the position on the secondary coordinates of the vehicle for each unit mileage based on the detection signal of the unit and performs centralized control of the entire device.
and a travel trajectory storage device that sequentially stores the data of the position on the secondary coordinates that changes every moment obtained by the signal processing device 3, and holds it as finite continuous position information corresponding to the current position of the vehicle. (RAM) 4, and a CRT display device that continuously updates and displays the distance traveled by the vehicle, the travel trajectory in a certain section to the current location, the current direction of travel, the required time, etc. in accordance with the output from the signal processing device 3;
A display command is sent to a display device 5 such as a liquid crystal display device and the signal processing device 3, and the display commands are sent to the display device 5, such as a liquid crystal display device, to change the direction of the travel trajectory displayed on the display device 5, to move the display position, to display a partial enlargement of the travel trajectory, and to display the display scale. The vehicle is configured with an operating device 6 that can appropriately change display format settings such as selection of , and search a traveling trajectory.

The operation of the travel route display device according to the present invention configured as described above will be explained below.

First, when the car is running, the operating device 6
Accordingly, the starting point and the display scale of the display device 5 corresponding to the road map used for guidance are appropriately set. Afterwards,
When the car starts running, the distance detector 1 sends one pulse signal for each unit distance traveled to the signal processing device 3, which counts the number of pulses to measure the distance traveled.
The output of the direction detector 2 is also sent to a signal processing device 3, where the direction in which the vehicle is traveling at each moment is determined. The signal processing device 3 calculates the current position (x, y) on the X-X coordinates according to a preset scaling factor based on the detected changes in the travel distance and direction of the vehicle as described above. It is determined by calculation every moment, and the calculation results are sequentially sent to the display device 5 and also sent to the traveling trajectory storage device 4 to be stored and held. Note that the stored contents are constantly read out and continuously sent to the display device 4. at the same time,
A direction signal at the current position is sequentially sent from the signal processing device 3 to the display device 5. As shown in FIG. 2, on the display device 5, a mark M1 indicating the current position B with directionality and a mark M2 indicating the travel trajectory from the starting point A to the current position B are displayed to show the driving state of the vehicle. This will be done in a simulated manner. In addition, the display mark M1 of the current position B is
For example, a ROM that stores mark information such as a large number of triangles, arrows, etc. with various directions in advance.
is provided in the signal processing device 3, and using the direction detection signal as an address, appropriately directional mark information is called up and sent to the display device 4, where it is displayed together with the current position. Also,
A search mark M3 can be arbitrarily written on the travel trajectory display mark M2 displayed on the display device 5 according to an operation instruction from the operating device 6 so that a check can be made during the travel route. . Furthermore, as shown in FIG. 2, the display device 5 displays a display D1 (this is a signal processing (It is sufficient to incorporate a timer that operates only when driving into the device 3), as well as a display D2 of the total distance traveled up to that point,
Alternatively, an auxiliary display such as a display D3 of the scale factor set by the operating device 6 is made as appropriate. In addition,
Since the display device 5 has a limit to the traveling trajectory displayed on it, when the limit is exceeded, a new starting point A' is set using the operating device 6 to allow the vehicle to continue traveling. good.

In this way, by comparing the travel trajectory up to the current location displayed on the display device 5 with the road shape on the map, the driver can easily determine which road the vehicle is traveling on. becomes possible. At this time, even if there is an accumulated error due to long-term distance relationships, the position on the planned course can be confirmed by comparing it with the road map using, for example, the last characteristic curve part as a reference, and the current position can be determined from that part. The only difference is the cumulative error up to that point, and position confirmation can be performed relatively accurately. At that time, if a search mark is written on the travel trajectory as appropriate, it will be easier to compare it with the road map. In addition, since the driving trajectory for a certain period of time is displayed and maintained, it is possible to simultaneously grasp the distance and direction of the vehicle in relation to past passing points. By changing the trail ratio, moving the display position according to the map, rotating the display direction of the driving trajectory according to the direction of travel of the own vehicle, or enlarging the past passing points, the own vehicle's Position confirmation can be performed efficiently and in detail.

Further, FIG. 3 shows a specific example of the configuration of the travel route display device according to the present invention.

In this configuration, first, the rate output of the direction detector 2 is sent to the interface circuit 8 for serial communication via the A/D converter 7, and the number of output pulses of the distance detector 1 is sent to the counter 9. and the result is sent to the interface circuit 8. Note that a timer 10 is provided in parallel on the output side of the counter 9, and the timer 10 detects when the counter 9 does not operate for a certain period of time or more, thereby detecting that the automobile is in a stopped state. Further, a detector 11 is provided to detect whether the automobile is moving forward or backward, and when the vehicle is moving backward, the detection signal is sent to the interface circuit 8, and the distance detector 1 and direction detector 2 between them are sent.
I am trying to make corrections for each input from . The operating device 6 is composed of an operating input switch group 61 and an operating input encoder 62 (priority encoder) that sends various command signals to the interface circuit 8 according to the combination of the switch contacts. In the figure, I indicates an operation interrupt signal, and E indicates an encoder output. Further, a digital switch circuit 12 for sensitivity adjustment is provided on the input side, thereby making it possible to correct variations due to changes over time, installation errors, etc. on the input side. Further, the signal processing device 3 includes a CPU 13 for performing centralized control;
An address decoder 14 decodes the address specified by the address decoder 14, a ROM 15 from which a pre-stored control program is read according to the decoder output and sends the data to the CPU 13, and a rate detection value and a distance detection value. The data read from the RAM 16 in accordance with the address from the CPU 13 is stored in a RAM 16 in which data of the position on the corresponding two-dimensional coordinates or data of auxiliary display such as mileage is stored. RAM1
It consists of a video RAM controller 18, an address multiplexer 19, and a CRT logic controller 20 for storing data in the CRT 7. In addition, 21 in the figure is a main power switch linked to the ignition switch of a car, for example.
Reference numeral 22 indicates an oscillator for controlling a clock signal for the CPU 8. Further, in the figure, CLK indicates a serial communication clock signal, S1 indicates a serial communication output, and S2 indicates a serial communication input. Furthermore, the display device 5 sends horizontal and vertical synchronizing signals H and V to the CRT display 51 in response to commands from the CRT logic controller 20.
It is composed of a CRT controller 52 and a shift register 54 that sends data read from the video RAM 17 to the CRT display 51 in synchronization with a clock signal from a CRT clock oscillator 53.

As described above, the travel route display device according to the present invention includes a first detector that detects the travel distance of a moving object such as a car, a second detector that detects the direction of the travel, and and a signal processing device that calculates the position on the secondary coordinates for each unit traveling distance of the moving body based on each output of the second detector;
A traveling trajectory storage device that sequentially stores the data of positions on the secondary coordinates that change every moment obtained by the signal processing device and holds the contents as continuous position information of the moving object, and the data in the storage device. A display device that continuously displays the traveling trajectory of a moving object according to the current position and a mark of the current position with directionality based on a direction detection signal, and an operation device that changes the setting of the display format. This configuration has the excellent advantage that the current position of a moving object on a road map and the direction of movement at that position can always be accurately grasped.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing one embodiment of the travel route display device according to the present invention, FIG. 2 is a diagram showing one display form of the display device in the same embodiment, and FIG. 3 is a specific circuit diagram of the present invention. FIG. 2 is a block diagram showing a configuration example. 1...Distance detector, 2...Direction detector, 3...Signal processing device, 4...Travel trajectory storage device, 5...Display device,
6...Operation device.

Claims (1)

[Claims] 1. Distance detector 1 that detects the travel distance of a moving object
, a direction detector 2 that detects the direction of the moving body, a signal processing device 3 that calculates the position on two-dimensional coordinates for each unit traveling distance of the moving body based on the output of each of these detectors, and the signal processing device 3 a travel trajectory storage device 4 that sequentially stores data of positions on two-dimensional coordinates that change every moment determined by the device, and holds the contents as continuous position information of the moving body;
The traveling trajectory of the moving object is displayed as a mark on the screen corresponding to the road map according to the data in the storage device, and a mark of the current position with directionality is displayed based on the detection signal from the direction detector. A driving route display device comprising a display device 5 that allows the user to move the vehicle, and an operating device 6 that can move the display marks of the current position and the travel trajectory by an external operation. 2. The driving route according to item 1 above, characterized in that a search mark can be arbitrarily written on the display mark of the driving trajectory displayed on the display device 5 by an operation instruction from the operating device 6. Display device.