JPS6115362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current position display device for a motor vehicle that displays the current position of a motor vehicle on a scheduled travel course preset on a road map.

Generally, when driving a car, in order to provide appropriate guidance so that the driver does not deviate from the planned course and get lost, a device is installed in the driver's seat that displays the current location using a road map. Various methods have been devised.

The present invention relates to such a display device, and in particular, detects a planned driving course drawn in advance on a road map by scanning the detection element for each unit of travel of the car to search for the planned driving course and detecting the planned driving course. To provide a current position display device for a car, which displays the current position of the car by a display element integrated with the detection element by shifting the element according to the distance traveled by the car. .

Further, the present invention appropriately rotates a road map set in advance according to the movement of the detection element according to the planned driving course, so that the planned driving course at the point where the current position of the vehicle is displayed is always oriented in the direction in which the vehicle is traveling. A current position display device for a vehicle that makes it clear to the driver the correspondence between the current position displayed on the planned course and the actual surrounding road conditions and facilitates recognition of the terrain. This is what we provide.

The current position display device for automobiles according to the present invention is
- A planned driving course is drawn in advance on a road map set on the orthogonal coordinates of Y using a substance that can be detected by an optical or electromagnetic sensing element, and the driving distance is determined according to the vehicle's travel distance detection signal. By causing the detection element to perform search scanning, that is, scanning, on the X-Y orthogonal coordinates using a preprogrammed external control signal, the display element provided integrally with the detection element moves along the planned course. This is what I decided to do as I went along.

In addition, the current position display device for a vehicle according to the present invention detects the declination rate of the detection and display element on the X-Y orthogonal coordinates when the detection and display element moves along the planned travel course as described above. However, the X-Y orthogonal coordinates are rotated accordingly.

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

FIG. 1 shows a display drive section in a current position display device for an automobile according to the present invention, and a substrate 1 (formed integrally with the case of this display drive section).
A turntable 4 is attached to the top of the turntable 4 through a rotational bearing 2 and has a transparent plate 3 on the top surface, a pulse motor 6 for rotationally driving the turntable 4 in the θ direction through a belt 5, etc. A Y-direction drive shaft 7 forming an X-Y orthogonal coordinate system on the table 4 and an X-direction drive shaft 8 slidably attached to the Y-direction drive shaft 7 (as shown in FIG. It has a guide member 8 that is loosely fitted, and a guide roller 10 that cooperates with a guide groove 9 formed on the turntable 4 side is provided at the other end), and can move on this X-direction drive shaft 8. The photodetecting element 1 is attached to this as shown in FIG.
1 and a light emitting element 12 are integrally provided, and an X-direction drive shaft 8 along the Y-direction drive shaft 7.
The scanning member 13 on the Y-direction drive shaft 7 is moved by means such as a wire 14 and a pulley 15 provided as appropriate, and a pulse motor 16 for driving the scanning member 13 on the Y-direction drive shaft 7 using a wire 17 and a pulley 18. The X-direction drive pulse motor 19 is driven through the X-direction drive pulse motor 19. In addition,
A θ limit switch 20 (operated by a protrusion 21 provided on a part of the turntable 4) is attached to the display drive unit to limit the rotation of the turntable 4 to, for example, 360°.

In addition, in the current position display device for automobiles according to the present invention, a road map with a planned travel course drawn in advance is set on the turntable 4 of the display drive unit configured as described above. As shown, this road map is formed to be transparent to light. That is, in this road map 22, road patterns, place names, etc. are printed on a transparent substrate 23 using light-transmissive ink, and a printed layer 25 is formed by covering the transparent film sheet 24 over the transparent substrate 23. It is designed to protect. On this road map 22, a planned travel course 26 according to the road map is written using, for example, a highly viscous colored pencil that can block light from the outside. Therefore, below the turntable 4 (transparent plate 3),
When the scanning member 13 of the display drive section to which the photodetecting element 11 is attached is moved, it is possible to detect that the scanning member 13 of the display drive section to which the photodetecting element 11 is attached is moved below the planned travel course 26 and that the light from the outside is suddenly cut off. I'm starting to be able to do it. It should be noted that an illumination lamp (not particularly shown) is attached to the display drive section so that light can always be radiated onto the road map 22.

FIG. 3 shows the overall configuration of a current position display device for a car according to an embodiment of the present invention, which includes a display drive unit A configured as described above and a drive of the scanning member 13 in this display drive unit A. and a drive control section B that performs control and rotation control of the turntable 4. This drive control section B includes a control circuit 27 consisting of, for example, a microcomputer, in which the scanning operation of the scanning member 13 is programmed in advance, a mileage pulse detector 28 that detects the mileage of the automobile, and this detector 28. The scanning control signal from the control circuit 27 is read in accordance with the output ΔL of the X-direction drive control signal.
S1 is sent to the X-direction drive circuit 30 (a circuit that gives a drive command to the X-direction drive pulse motor 19), and the Y-direction drive control signal S2 is sent to the Y-direction drive circuit 31.
(a circuit that gives a drive command to the Y-direction drive pulse motor 16) and a detection signal S3 from the photodetector element 11 of the display drive section A.
an input/output interface circuit 29 that stops reading the scanning control signal from the control circuit 27 in response to (sent via the amplifier 32);
It is composed of: The control circuit 27 also controls the X-direction drive circuit 30 to control positional changes x and y on the X-Y orthogonal coordinates of the scanning member 13 after scanning for each unit traveling distance ΔL of the automobile.
and read from each output of the Y direction drive circuit 31,
Based on the position detection signals x and y, the deflection angle θ on the X-Y orthogonal coordinates of the scanning member 13 at that point in time is determined.
is determined by calculation, and the program is set to send the declination signal S4 via the input/output interface circuit 29 to the θ direction drive circuit 33 (a circuit that gives a drive command to the θ direction rotation drive pulse motor 6). has been done. In this case, the argument angle θ is given by the following equation.

θ'=tan ^-1 y/x The operation of the current position display device for an automobile according to the present invention configured as described above will be explained below.

First, at the time of departure, the planned travel course 26 is written on the road map 22 set on the turntable 4 of the display drive unit A with a highly viscous colored pencil as described above, and the scanning member 1 is placed at the starting point on the course 26.
3, and then turn on the power switch (not particularly shown) of this current position display device. The subsequent mileage of the car is detected by the mileage pulse detector 28, and the unit mileage Δ
Each time L is detected, a scanning control signal from the control circuit 27 is sent via the input/output interface circuit 29 to drive control signals S1 and S2 in the X and Y directions to the X direction drive circuit 30 and the Y direction drive circuit 31, respectively. Sent. As a result, the pulse motor 19 for driving in the X direction and the pulse motor 1 for driving in the Y direction
6 are driven as appropriate, and the scanning member 13 performs a predetermined scanning operation. This scanning operation is performed by linear scanning or circular scanning within a certain range on the X-Y orthogonal coordinates. By scanning this scanning member 13,
When the light detecting element 11 detects a light-blocking state when the light comes under the planned running course 26, the detection signal is sent to the input/output interface circuit 2 via the amplifier 32.
9, thereby stopping the scanning of the scanning member 13. Therefore, the scanning member 13 stops directly below the planned travel course 26, and the light emitting element 12 provided integrally therewith provides an optical display of the current position. Furthermore, if the car travels a unit distance Δ
After advancing by L, corresponding scanning by the scanning member 13 is performed sequentially in the same manner as described above.
As a result, the scanning member 13 moves along the planned travel course 26 drawn on the road map 22.

In addition, the scanning member 1 according to each unit traveling distance ΔL
3, each drive amount x, y of the X and Y axes is determined by the control circuit 2 based on the outputs of the X direction drive circuit 30 and the Y direction drive circuit 31.
7, the declination angle θ of the current position is determined by calculation as described above, and according to the result, the declination signal S4 is sent to the θ direction drive circuit 33 to drive the pulse motor for θ direction rotation drive. Drive 6. Therefore, the turntable 4 of the display drive unit A is rotated by the angle θ so that the planned travel course 26 of the portion where the current position is displayed by the light emitting element 12 always faces in the direction of travel of the vehicle.

Note that the current position display device for a car according to the present invention is not limited to the embodiments described above; for example, the photodetecting element 11 and the light emitting element 12 are provided separately for each drive system. It is also possible to provide the light-emitting element 12 to follow the scanning detection of the planned travel course 26 by the light-detecting element 11 and to move the light-emitting element 12 thereto. Furthermore, instead of performing the scanning detection of the planned travel course 26 previously drawn on the road map 22 by the scanning member 13 photoelectrically using the photodetector element 11 as described above, it is also possible to perform scanning detection using other means such as magnetic ink. The planned travel course can be electromagnetically detected using a magnetic sensing element.
Furthermore, the detection of the deviation angle θ at the current position on the planned travel course 26 is not limited to the above-mentioned arithmetic processing by the control circuit 27, but is performed based on the deviation angle θ based on the travel distance detection signal and the position detection signal on the X or Y axis, for example. angle θ
may be calculated, or the actual declination rate of the vehicle may be directly detected using a gyroscope or the like. Furthermore, although the display drive section shown in FIG. 1 uses wires and pulleys as the drive mechanism for the scanning member 13, a screw mechanism or the like may be used instead to drive the scanning member 13. Needless to say.

As described above, the current position display device for an automobile according to the present invention includes a display drive unit having an X-Y drive mechanism for a scanning member and a θ drive mechanism for a turntable that sets a road map, and a scanning operation of the scanning member that is preprogrammed. a control signal is given to the display drive section in response to a travel distance detection signal of the automobile, and a change in the declination angle of the current position on the scheduled travel course is calculated by reading the necessary signal; and a drive control section that supplies the declination signal as a θ drive signal to the display drive section, and the device follows a scheduled driving course that is pre-written on a road map according to the driving condition of the vehicle. The current position can be displayed with high precision, and since the part of the planned driving course where the current position is displayed is always facing in the direction of travel of the car, the driver can easily see the current position displayed on the planned driving course. It has various excellent advantages such as being able to easily confirm the correspondence between the position and the actual surrounding road conditions.

[Brief explanation of the drawing]

FIGS. 1a and 1b are a plan view and a side sectional view showing an example of the configuration of a display drive section of a current position display device for a vehicle according to an embodiment of the present invention, and FIG. 2 is a diagram drawn on a road map in the same embodiment. FIG. 3 is a block diagram showing an embodiment of the present invention. A...display drive unit, B...drive control unit, 3...
Transparent plate, 4... Turntable, 6... Pulse motor for driving rotation in the θ direction, 11... Light detection element, 1
2...Light emitting element, 13...Scanning member, 16...Y
directional drive pulse motor, 19...X-direction drive pulse motor, 22...road map, 23...transparent substrate, 24...transparent film sheet, 25...printing layer, 26...planned travel course, 27... ... Control circuit, 28 ... Mileage pulse detector, 29 ... Input/output interface circuit, 30 ... X direction drive circuit, 31 ... Y direction drive circuit, 32 ... Amplifier.

Claims (1)

[Scope of Claims] 1. A scanning device in which a detection element for detecting a planned driving course written in advance on a road map set on a table and a display element for displaying the current position on the planned driving course are integrally attached. a display drive unit having an X-Y coordinate drive mechanism for the member; and a control signal is given to the display drive unit in response to a unit mileage detection signal of the vehicle to search for a preprogrammed travel course for the scanning member. A current position display device for a motor vehicle, comprising: a drive control section that performs a search operation for the vehicle, and stops the search operation in response to a detection signal of a planned travel course from the detection element. 2. A light detection element is used as a detection element, and the top surface of the table is made of a transparent plate, and a map is drawn on the transparent substrate using light-transmitting ink as a map set on the table. The vehicle according to item 1 above, characterized in that the road map is covered with a transparent film sheet, and the planned driving course is written on the road map with a light-shielding material. Current position display device.