JPH0782600B2 - Car location equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a car location device using a car navigation system.

[Prior Art] FIG. 5 is a functional system diagram showing a conventional car location system disclosed in, for example, Japanese Patent Application No. 59-45701, in which 1 is a road network and 2 is a main road network. A sign post 3 provided with a position information transmission function 11, which is installed at a point and transmits position information by broadcast, is a signal arrival area where the position information transmitted by this sign post 2 can be received,
4 is mounted on an automobile, receives the position information, and transmits the received position information together with the identification code of the automobile. The in-vehicle device 5 having the position information receiving and transmitting function 12 is arranged at a center that collectively manages the operation of a plurality of vehicles, receives the position information from the in-vehicle device 4 and processes the information, A center device having a position information receiving and information processing function 13 for displaying a position.
Here, the output of the sign post 2 is small, and the signal arrival area 3 is a limited narrow range centered on the arrangement point of the sign post 2.

Next, the operation will be described. When an automobile equipped with the in-vehicle device 4 enters the signal arrival area 3 and receives the position information from the sign post 2, the presence or absence of the change is identified by comparing with the stored position information, and if there is a change, it is stored. The location information being updated is updated, and the new location information and the identification code of the vehicle itself are transmitted. The center device 5 that has received the position information and the identification code displays the current position of the vehicle by processing them and refers to the new data and the data up to the previous time to refer to the average speed based on the travel distance and the travel time. And the traveling direction are detected to update the data, and thereafter, the present position of the vehicle is predicted based on these data and the elapsed time and displayed.

[Problems to be solved by the invention]

Since the conventional car location system is configured as described above, it is not possible to predict the traveling route such as whether the car will go straight at the intersection, turn right or left, so the current position cannot be predicted. However, the ambiguity increases with the lapse of time after receiving the position information, and there is a problem that a highly accurate car location system cannot be obtained.

The present invention has been made to solve the above problems, and utilizes prediction of a traveling route based on a car navigation system to accurately and accurately detect a vehicle even when the number of data transmissions is limited. It is an object to obtain a car location device capable of predicting the current position.

[Means for solving problems]

The car location device according to the present invention is installed between the intersections of the road network with the function of transmitting the road guidance information to the sign post, and the vehicle-mounted device is provided with the destination setting means. , The function to send the destination code set to it together with the location information and the identification code of the vehicle,
And a function to give a direction instruction to the driver from the road guidance information and the destination code, and the center device has information equivalent to the road guidance information and the destination code and position information sent from the vehicle-mounted device. And the function of displaying the time by predicting the current position of the automobile by processing the time elapsed from the time when the signal is received. [Operation] Based on the information and the destination code set in the destination setting means, the driver is given a direction instruction at the crossing point to guide the optimum route of the vehicle, and the destination code and the position information of the passed sign post. To the center device, and the center device selects the same optimum route as the in-vehicle device from the information equivalent to the road guidance information and the received destination code, Tracking predict the current position of the motor vehicle and displays it on the basis of the elapsed time from the reception.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, 1 is a road network, 2 is a main point between the intersections of the road network 1, and the position information transmission function 11 for transmitting position information in a broadcast manner, and broadcast Road guidance information transmission function that sends road guidance information to
14 is a sign post, 3 is a signal arrival area indicating the receivable range of both the information from the sign spot 2,
Reference numeral 4 denotes a vehicle equipped with a destination setting means, which receives the position information from the sign post 2 and sets the received position information together with the destination code, the identification code of the vehicle, and the traveling distance. The position information reception / transmission function 12 to be transmitted and the road guidance information from the sign post 2 are received, and based on the received road guidance information and the set destination code, etc. An in-vehicle device 5 which has a function of receiving road guidance information and an optimum direction instruction function 15 for giving a direction instruction is arranged in a center that collectively manages the operation of a plurality of vehicles.
Position information reception and information processing that receives information from the vehicle and processes information equivalent to the road guidance information, received position information, destination code, and the like, tracks and predicts the current position of each vehicle, and displays the predicted position. A center device having a function 13.

FIG. 2 is a block diagram showing the details of the sign post 2. In the figure, 21 is classified into areas having a hierarchical structure according to the levels of regions, prefectures, wards / counties / cities, towns / villages / chomes, etc., and each area has a predetermined number of digits. By categorizing by number, the point number of each point is determined, the position information of the installation position of the sign post 2 according to this point number, and the purpose of expressing all over the country by the above point number according to the up / down traveling direction By combining the direction indications at several intersections on the optimal route to the destination and the distances from the sign post 2 to those intersections for each land code, coarse remote areas and finer suburbs This is a read-only memory (hereinafter referred to as ROM) that stores road guidance information compressed into about 100 words. Further, 22a and 23a are P / S converters that read position information or road guidance information from the ROM 21 and perform code conversion, and 22b and 2a.
3b is a modulator for FS modulating the outputs of the P / S converters 22a, 23a, 22c,
Reference numeral 23c is a wireless transmitter that amplifies the outputs of the modulators 22b and 23b and transmits them through the antennas 22d and 23d. Here, the aerial line 22d for transmitting the position information and the aerial line 23d for transmitting the road guidance information are arranged at positions slightly deviated in the traveling direction of the vehicle,
The vehicle passing through the signal arrival area 3 is configured to receive the both information in different orders depending on the traveling direction.

FIG. 3 is a block diagram showing the details of the vehicle-mounted device 4. In the figure, 41a and 45d are antennas and 41b is an antenna 41a.
A radio receiver for receiving and amplifying position information and road guidance information from the sign post 2 received in step 41c, a demodulator 41c for FS demodulating the output of the radio receiver 41b, and 41d for transcoding the output of the demodulator 41c S / P converter, 42 is a destination switch as a destination setting means for setting a destination code by the point number, 43 is a mileage measuring device for measuring the mileage by counting axle pulses, 44 Is a processing circuit that processes the outputs of the S / P converter 41d, the destination switch 42, and the mileage measuring device 43, and 45a is a code conversion of the position information, the destination code, the vehicle identification code, etc. output by the processing circuit 44. P / S converter, 4
5b is a modulator that FS modulates the output of the P / S converter 45a, 45c is a wireless transmitter that amplifies the output of the modulator 45b and transmits it from the antenna 45d, and 46a is a direction indicator at the intersection point output by the processing unit 44. Is a display that gives the driver a visual indication and 46b is a voice output unit that gives the driver a voice.

FIG. 4 is a block diagram showing the details of the center device 5. In the figure, 51a is an antenna, 51b is a wireless receiver for receiving and amplifying the position information, destination code, identification code, etc. from each vehicle-mounted device 4 received by the antenna 51a, and 51c is the output of the wireless receiver 51b. Demodulator for demodulation, 51d is an S / P converter that performs code conversion of the output of the demodulator 51c, and 52 is data that processes the output of the S / P converter 51d to track each vehicle and predict the current position of each vehicle. A processing device, 53 is a large-sized display device for visually displaying the current position of each vehicle tracked and predicted by the data processing device 52, and 54a to 54c are CRTs to which the data processing device 52 is connected.
Display, keyboard, and printer.

Next, the operation will be described. The driver of the automobile sets the destination code of the destination to be reached in the destination switch 42 in advance. When such an automobile enters the signal arrival area 3, the on-vehicle device 4 mounted therein receives the position information and the road guidance information in the order corresponding to the traveling direction. The processing circuit 44 determines whether the traveling direction of the vehicle is up or down according to the reception order. The processing circuit 44 performs a condition comparison with the received road guidance information on the basis of the traveling direction, the destination code set in the destination switch 42, etc., selects the corresponding one word and records it. Directional indications at some intersections on the optimum route of the destination are sequentially output to the display device 46a and the voice output unit 46b according to the traveling distance output from the traveling distance measuring device 43. As a result, the driver is given a direction instruction at each intersection visually and audibly, and the optimum route guidance to the destination is performed. At the same time, the processing circuit 44
The received position information, the destination code set in the destination switch 42, and the identification code of the vehicle are output to the P / S converter 45a and transmitted to the center device 5 through the antenna 45d.

The center device 5 visually displays the current position of the vehicle on the large display device 53 based on the position information and the identification code in the information received by the data processing device 52. Here, the data processing device 52 has built-in information equivalent to the road guidance information transmitted by each sign post 2, and the sign post 2 through which the car passes from among them based on the received position information. The one corresponding to is selected. Next, a condition comparison is performed with the selected information based on the received destination code, the traveling direction of the vehicle, etc.
Select the same word as that selected in step 1, and select the optimum route for the vehicle. After that, based on the elapsed time from the time of receiving the information and the average speed of the vehicle calculated so far in the same manner as in the conventional case, the vehicle is tracked on the selected optimum route. The current position at every moment is predicted and visually displayed on the large display device 53 by operating the keyboard 54b. Further, the display can be output to the CRT display 54a, the printer 54c, etc., if necessary.

〔The invention's effect〕

As described above, according to the present invention, by using the road guidance information from the sign post and the destination code set in the destination setting means, the driver is given a direction instruction at the intersection, and the optimum route to the destination is given. In addition to performing guidance, the center device also selects the same optimum route by the same method and tracks and predicts the current position of the car, so accurate position prediction is always possible and the number of data transmissions is limited. Even in the case of receiving a car, there is an effect that a car location device that can monitor the current positions of a large number of cars with sufficient accuracy can be obtained.

[Brief description of drawings]

FIG. 1 is a functional system diagram showing a car location device according to an embodiment of the present invention, FIG. 2 is a block diagram showing details of a sign post thereof, and FIG. 3 is a block diagram showing details of an on-vehicle device. FIG. 4 is a block diagram showing the details of the center device, and FIG. 5 is a functional system diagram showing a conventional car location system. 1 is a road network, 2 is a sign post, 3 is a signal arrival area,
4 is an in-vehicle device, 5 is a center device, 11 is a position information transmission function, 12 is a position information reception and transmission function, 13 is a position information reception and information processing function, 14 is a road guidance information transmission function, 15
Is a function for receiving road guidance information and indicating an optimum direction, and 42 is a destination setting means (destination setting switch). In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An optimum route guidance for a destination code indicating a destination from a position which is installed between intersections of a road network and which is different from the transmission position of the positional information of the installation position in the traveling direction of the vehicle. A sign post having a transmission function for transmitting road guidance information in which a direction instruction at a crossing point is combined, a reception function for the position information and the road guidance information transmitted from the sign post, the position information and the road The direction in which the vehicle is traveling is determined based on the order in which the guidance information is received, and the optimal route to the destination is determined based on the determined traveling direction and the road guidance information selected based on the destination code set by the built-in destination setting means. An in-vehicle device having an informing function for informing a driver of a direction instruction of an intersection point above, and a transmitting function for transmitting the position information, the destination code, and an identification code for identifying a vehicle; A receiving function for receiving the information transmitted from the mounting device, an information built-in function for incorporating the same information as the road guidance information transmitted by the sign post, and the current position of the vehicle by the received position information and the identification code. A display for predicting and displaying the current position of the vehicle based on the optimal route to the destination selected from the information built-in function based on the received destination code and the elapsed time from the time of receiving the information. A car location device including a center device having a function.