JPH0782599B2 - Car location equipment - Google Patents

Description

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

[Conventional technology]

FIG. 5 is a functional system diagram showing a conventional car location system shown in, for example, Japanese Patent Application No. 59-45701. In FIG. 5, 1 is a road network and 2 is installed at main points of the road network 1. A sign post 3 having a position information transmission function 11 for transmitting position information in a broadcast manner, 3 is a signal arrival area where the position information transmitted by this sign post 2 can be received,
4 is an on-vehicle device equipped with a position information receiving and transmitting function 12, which is mounted on a vehicle, receives the position information, and transmits the received position information together with the identification code of the vehicle. A center device having a position information reception and information processing function 13 which is arranged in a centrally managed center, receives position information from the vehicle-mounted device 4, processes it, and displays the current position of each vehicle. .
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. Is calculated, and the traveling direction is detected to update the data. Thereafter, the present position of the automobile 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 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 it is not possible to predict its current position. 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 has the destination code from the center device. The center device also has a function of receiving and holding the road guidance information and a function of giving a direction instruction to the driver from the destination code stored and receiving the road guidance information. It is provided with a function of processing the transmitted destination code, the position information received from the vehicle-mounted device, and the elapsed time from the time of receiving the position information to predict the current position of the vehicle and display it.

[Action]

The in-vehicle device according to the present invention gives the driver a direction instruction at the intersection based on the road guidance information received from the sign post and the destination code received and held from the center device to guide the optimum route of the vehicle. At the same time, the position information of the passed sign post is transmitted to the center device, and the center device identifies the same information as the road guidance information, the received position information, and the destination code transmitted to the car, which is the same as the on-vehicle device. The optimum route is selected, the current position of the vehicle is tracked and predicted based on the elapsed time from the time of signal reception, and the predicted position is displayed.

〔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 reachable area indicating the receivable range of both information from the sign post 2, 4
Is mounted on an automobile, receives position information from the sign post 2, and transmits the received position information together with an identification code of the automobile, a mileage, and the like, and a position information receiving and transmitting function 12 and a center device 5. The destination code to be transmitted is received, and the destination code receiving and retaining function 15 for retaining the one addressed to the car concerned and the road guidance information from the sign post 2 are received and received. An in-vehicle device equipped with a road guidance information reception and optimum direction instruction function 16 for giving a driver a direction instruction at an intersection based on the destination code holding the road guidance information, and 5 is the operation of a plurality of vehicles. A destination code determination and transmission function, which is arranged in a center that collectively manages, determines the destination codes for instructing the destination of each automobile, and transmits the destination codes. And the information received from the on-vehicle device 4 is processed to process the information equivalent to the road guidance information, the received position information, the destination code transmitted to the car, and the current position of each car is tracked and predicted. A center device having a position information receiving and information processing function 13 for displaying the information.

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., all over the country, 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 For each location code, combine direction indications at some intersections on the optimum route to the destination and distances from the sign post 2 to those intersections to coarsen remote areas and finer suburbs. This is a read-only memory (hereinafter referred to as ROM) that stores road guidance information that has been compressed into about 100 words. Further, 22a and 23a are P / S converters for reading position information or road guidance information from the ROM 21 and converting the code,
b and 23b are modulators for FS modulating the outputs of the P / S converters 22a and 23a, 2
2c and 23c amplify the outputs of the modulators 22b and 23b to the antennas 22d and 23d.
It is a wireless transmitter that transmits more. 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 from each other in the traveling direction of the vehicle, and the vehicle passing through the signal arrival area 3 has a different traveling direction. The two pieces of information are received in different orders.

FIG. 3 is a block diagram showing the details of the vehicle-mounted device 4. In the figure, 41a and 42a are antennas, and 41b and 42b are antennas.
Radio receivers for receiving and amplifying position information from the sign post 2 received at 41a or 42a, road guidance information, or destination code from the center device 5, 41c, 42c
Is a demodulator for FS demodulating the output of the wireless receiver 41b or 42b, 41d, 42d is a S / P converter for code-converting the output of the demodulator 41c or 42c, and 43 is a travel distance determined by counting axle pulses, etc. A mileage measuring device that is measuring, 44 is a processing circuit that processes the output of the S / P converters 41d, 42d, mileage measuring device 43, 45a is position information output by the processing circuit 44, a vehicle identification code, etc. P / S converter for code conversion, 45b is P / S converter 4
The modulator for FS modulating the output of 5a, 45c is a wireless transmitter for amplifying the output of modulator 45b and transmitting it from the antenna 41a, and 46a is a visual indication of the direction indication at the crossing point output by the processing unit 44. 46b is a voice output unit for giving it to the driver by voice, and 47 is a coaxial relay for switching between transmission and reception of the antenna 21a.

FIG. 4 is a block diagram showing the details of the center device 5. In the figure, 51a is an antenna, 51b is a radio receiver for receiving and amplifying position information, identification code, etc. from each vehicle-mounted device 4 received by the antenna 51a, and 51c is an output of the radio receiver 51b.
FS demodulator for demodulation, 51d is an S / P converter for converting the output of the demodulator 51c, 52 is a destination code for indicating the destination of each car, and the output of the S / P converter 51d A data processing device that processes each vehicle to track each vehicle and predict the respective current position, 53a is a P / S converter that performs code conversion of the destination code output from the data processing device 52, and 53b is a P / S conversion A modulator for FS modulating the output of the device 53a, 53c is a wireless transmitter for amplifying the output of the modulator 53b and transmitting from the antenna 51a, and 54 is a visual display of the current position of each vehicle tracked and predicted by the data processing device 52. Large display devices 55a to 55c are a CRT display, a keyboard, and a printer connected to the data processing device 52.

Next, the operation will be described. The center device 5 outputs to each of the automobiles whose operation is controlled by the data processing device 52, a combination of each identification code and a destination code indicating a destination, and outputs the combination from the antenna 51a. The vehicle-mounted device 4 mounted on each vehicle receives this by the antenna 42a, selects the one addressed to the vehicle by the processing circuit 44 based on the identification code, and holds it. When a vehicle whose destination code is held in the processing circuit 44 of the on-vehicle device 4 thus mounted enters the signal arrival area 3, the on-vehicle device 4 is ordered by the antenna 41a in the order corresponding to the traveling direction. Receives location information and road guidance information. 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 makes a condition comparison with the road guidance information received based on the traveling direction determined in this way, the destination code received from the center device 5 and held, and selects the corresponding one word. Then, according to the traveling distance output from the traveling distance measuring device 43, the direction indicators at some intersections on the optimal route to the destination recorded therein are sequentially displayed.
a to the audio output unit 46b. As a result, the driver is given a direction indication at each intersection visually and audibly to guide the optimum route to the destination. At the same time, the processing circuit 44 outputs the received position information, the identification code of the vehicle concerned, etc. to the P / S converter 45a, controls the switching of the coaxial relay 47, and transmits it to the center device 5 from the antenna 41a. .

The center device 5 visually displays the current position of the vehicle on the large display device 54 based on the position information and the identification code received by the data processing device 52. Where the data processing device
52 includes information equivalent to the road guidance information transmitted by each sign post 2, and the one corresponding to the sign post 2 through which the car has passed is selected from among them based on the received position information. Be done. Next, a condition comparison is performed with the selected information based on the destination code transmitted to the vehicle, the traveling direction of the vehicle, and the like,
The same one word as that selected by the vehicle-mounted device 4 is selected to 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 54 by operating the keyboard 55b. Further, the display can be output to the CRT display 55a, the printer 55c, 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 received and held from the center device, the driver is given a direction instruction at the intersection to reach the destination. In addition to guiding the optimum route of the car, the center device selects the same optimum route by the same method to track and predict the current position of the car, so highly accurate position prediction is possible and data transmission is possible. Even if the number of times is limited, it is possible to monitor the current positions of many automobiles with sufficient accuracy, and since the destination code is given from the center device, centralized management by the center becomes possible, Since the driver does not have to perform the destination code setting operation, it is an effective car location used for operation management of taxis with many destinations, patrol cars requiring emergency, etc. The effect of Yon device is 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 destination code receiving and holding function, 16 is a road guidance information receiving and optimum direction indicating function, 17 is a destination code determining and transmitting function. 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 a transmission position of position information of an installation position in a traveling direction of a vehicle. A sign post with a transmission function to transmit road guidance information that combines direction instructions at intersections for the purpose of adding a destination code to the identification code for identifying the vehicle for operation management. A center device having a transmission function for transmitting, a reception function for receiving the position information and road guidance information transmitted from the sign post, and the identification code and destination code transmitted from the center device, and the position information The direction of travel of the vehicle is determined from the order in which the road guidance information is received, and the destination is determined based on the determined direction of travel and the road guidance information selected based on the received destination code. An in-vehicle device having a notification function for informing a driver of a direction instruction of an intersection on the optimal route to the vehicle, and a vehicle-mounted device having a transmission function for transmitting the position information and the identification code. A receiving function for receiving the information, a built-in information function that contains the same information as the road guidance information transmitted by the sign post, and the current position of the vehicle is displayed by the received position information and the identification code. An optimum route to the destination selected from the information built-in function based on the received destination code,
A car location device having a display function of predicting and displaying a current position of a vehicle based on an elapsed time from a reception point of the information.