JP2619065B2 - Navigator device for vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle navigator device that samples traveling position data of a vehicle in accordance with the traveling speed of the vehicle and displays this on a screen as locus data. .

[Prior Art] In order to facilitate driving on unknown land or at night, the traveling path displayed on a CRT (cathode ray tube) is illuminated with the current position of a car, which is constantly changing, calculated by a data processing device. A navigator device configured to overlap and display points is used.

This type of apparatus obtains current position data by inputting an azimuth signal output from a terrestrial magnetism detection type azimuth sensor and a traveling distance detected from a movement amount sensor to a data processing apparatus. As shown in the figure, a bright spot indicating the current position of the car is displayed on the CRT (1), while every time the vehicle travels a predetermined distance, the position data at this time is sampled and stored in a memory (not shown), and then read as locus data. On the paths (2) and (3) that have been traveled so far, the display is made as bright spots indicated by black circles at equal intervals regardless of the traveling speed.

[Problems to be Solved by the Invention] By the way, if the traveling speed is high, the vehicle is traveling on a straight road, and if the locus data is displayed with a coarser density than when traveling on a section where the vehicle speed is low, Despite being sufficient, even when the traveling speed is high, the above-described apparatus samples position data at the same interval as when the traveling speed is low, and stores this in the memory as locus data. A large memory is required.

The present invention has been made in view of the above problems,
An object of the present invention is to provide a vehicle navigator device in which the position data sampling interval is made variable in accordance with the traveling speed of the vehicle, the frequency of memory usage during high-speed traveling is reduced, and the capacity is reduced. It is in.

[Means for Solving the Problems] A vehicular navigator device according to the present invention includes a vehicle speed sensor for detecting the speed of a vehicle, a current position detecting means for detecting a current position of the vehicle, and a current position at a predetermined distance. And a means for determining a predetermined distance interval in accordance with the speed of the vehicle.

[Operation] A vehicle navigator device according to the present invention detects a vehicle speed by a vehicle speed sensor, and stores a current position in a memory at a predetermined distance interval determined in accordance with the magnitude of the vehicle speed. It is something to memorize.

Embodiment An embodiment of the device of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a block diagram showing an embodiment of the apparatus according to the present invention. In FIG. 2, reference numeral (7) indicates a radio wave transmitted from, for example, an artificial satellite or a Loran station (not shown) captured by an antenna (5). , This is input to the receiver (6), and the latitude,
A hyperbolic radio navigation device for detecting the longitude to determine the current position of the vehicle is shown. (8) is a geomagnetic detection type direction sensor for similarly determining the current position of the vehicle,
It is configured so that these can be selected and used.
(9) is a displacement sensor that detects the number of revolutions of the propeller shaft of the automobile and outputs a vehicle speed signal, and integrates the output to output the traveling distance. The vehicle speed signal is sent to a sampling circuit (12) described later. The mileage is connected to be input to the data processing device (14). Connected to the counter on the input side of the sampling circuit (12) (11) is sampled when the pulse output from the clock pulse generator (10) for counting a predetermined number, a vehicle speed signal V _m to the sampling circuit (12) Pulse Is output, and at the start of the next counting, the content of the counting is cleared to zero by the control signal from the data processing device (14), and the counting is restarted. (1
3) is a map data memory for inputting and storing map data written in a fixed memory such as a ROM card, and (16) a map input to the map data memory (13) as shown in FIG. In addition to drawing, the current position data of the vehicle calculated by the data processing device (14) is displayed as a bright spot (4), and the traveling path (2),
(3) A CR in which position data sampled at intervals corresponding to the vehicle speed is displayed as a bright point indicated by a black circle.
T (cathode ray tube), and (15) a locus data memory for storing and reading sampled position data as locus data.

The data processing device (14) is multiplied by a coefficient C from the sampling circuit (12) to the vehicle speed signal V _m sampled at predetermined time intervals, the vehicle speed large, the position data sampled distance setting value corresponding to the small D _s = CV _m, and when this set value exceeds the preset maximum set value D _max. and the minimum set value D _min. , the set value D _s is changed to the maximum set value D _max. or the minimum set value D _min. maintaining and outputs, a large set value D _s of the vehicle speed is at the maximum setting value D _max. and the minimum setting value D _min. width, is programmed to output a variable output corresponding to small. Thus in contrast to the travel distance D output the set value D _s from the movement amount sensor (9) obtained, and outputs a coincidence signal when the running distance D and set value D _s is matched, this Hyperbolic radio navigation system as sampling signal (7)
Alternatively, the position data calculated based on the azimuth signal output from the azimuth sensor (8) and the travel distance output from the movement amount sensor (9) is sampled and stored in the memory (15) as locus data. It is programmed to be read out so as to display a bright spot on a later path.

Incidentally, the travel distance D, which is output from the moving amount sensor (9) to compare the set value D _s is after match detection of the travel distance D and the set value D _s is returned to zero, the next set value D _s in addition to being controlled from the comparison start of to count up again, at the time coincidence detection between the travel distance D and the set value D _s, the counter (11)
Is output so as to output a control signal for clearing the counting content.

The operation of the thus constructed apparatus will be described with reference to the flowchart of this apparatus shown in FIG.

Now, when the car starts traveling toward the destination, the count of the counter (11) is cleared to zero (step 41), and the counter (11) starts counting pulses transmitted from the clock pulse generator (10). (Step 42). When the counter (11) has counted a predetermined number of pulses (step 43),
Sampling pulses are input to the sampling circuit (12), output from the moving amount sensor (9) The vehicle speed signal V _m is detected (step 44), is input to the data processing unit (14). The vehicle speed signal V _m is multiplied by a coefficient C, and calculates the position data sampled distance setting value D _s = CV _m corresponding to the vehicle speed (step 45).

On the other hand, on the CRT (16), position data calculated based on the azimuth signal output from the hyperbolic radio navigation device (7) or the azimuth sensor (8) and the traveling distance output from the movement amount sensor (9) are displayed. have been displayed as a bright spot as shown in FIG. 3 (4) (step 46), the travel distance D, which is output from the moving amount sensor (9) matches the set value D _s (step 47 ), The current position data at this time is sampled, stored in the memory (15) as locus data (step 48), read out when the vehicle advances to the next sampling point, and used as locus data in FIG. Is displayed on the CRT (16) as a bright point indicated by a black circle, and the process returns to step 41 again to repeat the above processing.

Thus, as shown in FIG. 3, the trajectory data is displayed at a long interval on the traveling road (2) having a high speed and at a short interval on the traveling road (3) having a low speed. .

[Effect of the Invention] As described above, according to the present invention, the current position is stored at predetermined distance intervals corresponding to the magnitude of the speed of the vehicle. The current position is increased by increasing the predetermined distance when the speed is high due to the large width of the road, and by decreasing the predetermined distance when the user does not know the road well or when the road is narrow and the speed is low. Can be efficiently stored in the memory, and when the current position stored in the memory is used as the trajectory data,
A change in the speed of the vehicle can be easily recognized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an embodiment of the apparatus of the present invention, FIG. 3 is a view showing current position data and trajectory data displayed on a cathode ray tube, FIG. FIG. 5 is a flow chart showing the procedure of an embodiment of the apparatus of the present invention, and FIG. 5 is a view showing current position data and trajectory data displayed by the conventional apparatus. In the drawing, (2): a path with a high traveling speed, (3): a path with a low traveling speed, (4): current position data, (5) ...
... antenna, (6) ... receiver, (7) ... hyperbolic radio navigation system, (8) ... azimuth sensor, (9) ... movement amount sensor, (10) ... clock pulse generator, (11) ) Counter, (12) Sampling circuit, (13) Map data memory, (14) Data processor, (15)
Track data memory, (16) ... CRT.

Claims (1)

(57) [Claims] A vehicle speed sensor for detecting a speed of the vehicle; a current position detecting means for detecting a current position of the vehicle; a memory for storing the current position at predetermined distance intervals; Means for determining in accordance with the magnitude of the speed of the vehicle.