JP2005092403A - Road traffic system and on-vehicle device used for the road traffic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road traffic system recognizing a lane during traveling to contribute to support of the traveling of a vehicle when a plurality of lanes are present, and to provide an on-vehicle device used for the road traffic system. <P>SOLUTION: This road traffic system has: a reading means 5 provided in the vehicle, reading an arrangement pattern comprising a PN code installed on the lane; a database 10 storing code information corresponding to the arrangement pattern for supporting the traveling of the vehicle; and a retrieval means 9 retrieving the arrangement pattern read by the reading means 5. The arrangement pattern differs in each the lane. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a road traffic system and an in-vehicle device used in the road traffic system.

Conventionally, a road traffic system is known in which a magnetic marker is embedded at a predetermined interval on a road, and a magnetic sensor magnetic pole magnetic pole array pattern is read using a magnetic sensor to identify the position of the vehicle (for example, , See Patent Document 1).
JP 2001-28095 A

  By the way, in highways, there are usually a plurality of lanes such as traveling lanes, overtaking lanes, etc., but by reading the PN code, these lanes can be identified, which lane is being traveled, If the vehicle speed can be automatically limited or the vehicle can be automatically guided from one lane to another lane, it is desirable to contribute to the reduction of traffic jams, traffic accidents, and the like.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to recognize driving lanes and contribute to driving support of a vehicle when there are a plurality of lanes. An object of the present invention is to provide a road traffic system that can be used and a vehicle-mounted device used in the road traffic system.

  The road traffic system according to claim 1 is provided with reading means for reading an arrangement pattern formed of a PN code provided in a vehicle and installed in a lane, and code information corresponding to the arrangement pattern for supporting traveling of the vehicle. It comprises a stored database and search means for searching for an arrangement pattern read by the reading means, wherein the arrangement pattern is different for each lane.

  The road traffic system according to claim 2 is characterized in that the vehicle has auto-cruising means, and the auto-cruising means performs control for each lane based on the arrangement pattern.

  The road traffic system according to claim 3 is characterized in that the database is provided in the vehicle.

  The road traffic system according to claim 4 is characterized in that the database is provided in a server.

  The road traffic system according to claim 5 is characterized in that the search means is provided in the vehicle.

  The road traffic system according to claim 6 is characterized in that the search means is provided in a server.

  The in-vehicle device according to claim 7 is provided with a reading means for reading an arrangement pattern formed of a PN code provided in a vehicle and installed in a lane, and code information corresponding to the arrangement pattern for assisting the traveling of the vehicle. Is stored, and search means for searching for the arrangement pattern read by the reading means, the arrangement pattern being different for each lane.

  The vehicle-mounted device according to claim 8 is characterized in that the vehicle has auto-cruising means, and the auto-cruising means performs control for each lane based on the arrangement pattern.

  According to the first to eighth aspects of the present invention, when there are a plurality of lanes, it is possible to recognize the lane being traveled and contribute to the support of travel of the vehicle.

  According to the second and eighth aspects of the present invention, since the vehicle is further provided with auto-cruising means, the vehicle speed is automatically controlled for each lane, and the vehicle is automatically guided from one lane to another lane. It is possible to perform control for each lane such as to do.

  Embodiments of a road traffic system according to the present invention and in-vehicle devices used therefor will be described below with reference to the drawings.

  FIG. 1 shows an example of a road traffic system according to the present invention. In FIG. 1, reference numeral 1 denotes an expressway (running road), reference numeral 2 denotes a magnetic marker (magnetic nail) embedded in the expressway 1, reference numeral 3 is a vehicle.

  As shown in FIGS. 1 and 2, the magnetic marker 2 is arranged with a predetermined interval, and either one of the N pole and the S pole is directed to the road surface. Here, the following arrangement pattern follows an M-sequence pattern which is a kind of PN code.

  The highway 1 is composed of a plurality of lanes 1A to 1N, and the PN code arrangement pattern of each lane is different. For example, the lane 1A is a traveling lane, the lane 1B is an overtaking lane, and the number of PN code arrangement patterns is selected according to the number of lanes. Note that 1A 'to 1N' are opposite lanes.

  Here, an M sequence (maximum periodic sequence or maximum length sequence) is used for the PN code, and the order n of the M sequence is “7”.

  There are nine connection methods for the generation method using the shift register of the M-sequence array pattern of order n = 7, and nine different array patterns are obtained.

  An example of the M-sequence connection method is shown in FIG. FIG. 3A shows the exclusive OR of the contents of the seventh register D7 and the contents of the first register D1, and feeds back the contents of the exclusive OR circuit EX1 to the first register D1. This is referred to as the symbol (7, 1). FIG. 3B shows an exclusive OR of the contents of the seventh register D7 and the contents of the third register D3, and the contents of the exclusive OR circuit EX2 are fed back to the first register D1. This is denoted as symbol (7,3). FIG. 3C shows the exclusive OR of the contents of the seventh register D7 and the contents of the third register D3, and the exclusive OR of the contents of the exclusive OR circuit EX2 and the contents of the second register D2. The logical sum is taken, the exclusive OR of the contents of the exclusive OR circuit EX3 and the contents of the first register D1 is taken, and the contents of the exclusive OR circuit EX1 are fed back to the first register D1. This is indicated by the symbol (7, 3, 2, 1). When the remaining connection methods are expressed only by symbols, (7, 4, 3, 2), (7, 6, 4, 2), (7, 6, 3, 1), (7, 6, 5, 2) , (7,6,5,4,2,1), (7,5,4,3,2,1), and since these connection methods are common technical knowledge, explanation of the contents is omitted.

  The vehicle 1 is provided with a vehicle-mounted device 4 as shown in FIG. The in-vehicle device 4 includes a reading unit 5 that reads the arrangement pattern. The reading unit 5 includes a magnetic sensor 6, an amplifier circuit 7, and a magnetic marker determination circuit 8, and the magnetic sensor 6 detects a change in magnetism caused by the magnetic marker 2. The detection signal of the magnetic sensor 6 is input to the amplifier circuit 7, amplified and input to the magnetic marker determination circuit 8.

  Based on the detection signal, the magnetic marker determination circuit 8 determines whether it is N pole (for example, corresponding to binary code “1”) or S pole (corresponding to binary code “0”), The waveform is shaped and a “0” or “1” clock signal is output to the shift register 8A bit by bit.

  The shift register 8A outputs the contents to the arithmetic processing unit (CPU) 9 bit by bit. The arithmetic processing unit 9 detects the array patterns PN1 to PNn of the magnetic marker 2 based on the output of the shift register 8A, and accesses the database 10.

The database 10 stores code information corresponding to the array patterns PN1 to PNn to support traveling. For example, the relationship between the PN code shown in Table 1 below and the vehicle speed limit speed is stored as a table.

The arithmetic processing unit 9 searches the array patterns PN1 to PNn read by the reading unit 5 and the code information stored in the database 10, and acquires code information corresponding to the array patterns PN1 to PNn.

  The arithmetic processing device 9 receives a vehicle speed signal from the vehicle speed detection device 11, and controls the vehicle 3 based on the vehicle speed signal and the code information acquired from the database 10.

  The vehicle 3 is equipped with a vehicle speed control module (acceleration indicating actuator) 12 that constitutes a part of the auto-cruising means, and the arithmetic processing unit 9 is operated in the lane in which the vehicle 3 is traveling, for example, in the direction of the arrow Z. As a result, a traveling speed instruction signal is output to the vehicle speed control module 12 so that the vehicle 3 travels at a speed limit corresponding to the lane 1A.

  The vehicle speed control module 12 outputs a throttle control signal to the engine throttle control device 12A or a signal for applying a brake to the brake control device 12B based on the speed instruction signal from the arithmetic processing unit 9.

  The arithmetic processing unit 9 executes a predetermined process based on the operation of the operation unit 13, outputs a signal for displaying the traveling lane on the display unit 14 as necessary, and violates the speed limit. In that case, an audio signal indicating a warning is output to the audio device 15.

  That is, when the vehicle 1 starts traveling, as shown in FIG. 5, the magnetic marker determination circuit 8 determines whether or not a detection signal of the magnetic marker 2 is obtained (S.1). When the detection signal is obtained, the magnetic marker determination circuit 8 inputs 1 bit to the shift register 8A and shifts the data (S.2). The arithmetic processing unit 9 determines whether or not n bits of detection signals have been captured (S.3), and repeats the processes of S.1 to S.3 until n (n = 127) bits of detection signals have been captured.

  When the reading of the n-bit detection signal is completed, the arithmetic processing unit 9 accesses the database 10 to search the corresponding PN code, and reads the speed limit value corresponding to the PN code read from the database 10 (S .4). Next, the arithmetic processing unit 9 compares the detection signal value from the vehicle speed detection unit 11 with the speed limit value to determine whether or not the speed of the vehicle 1 is within the speed limit of the lane (S.5). . When the traveling speed of the vehicle 1 is within the speed limit, the process returns to S.1 and the processes of S.1 to S.5 are repeated, and when the traveling speed of the vehicle 1 is outside the speed limit, the vehicle speed control module. The vehicle speed control module 12 outputs a throttle control signal to the engine throttle control device 12A based on the speed command signal or outputs a signal for applying a brake to the brake control device 12B. A signal for displaying the speed limit information is output on the display unit 14 and an audio signal indicating a warning is output to the audio device 15 (S.6).

It is a figure which shows an example of the road traffic system concerning this invention. It is a figure which shows the relationship between the arrangement pattern of a PN code concerning this invention, and a lane. It is explanatory drawing for demonstrating an example of the production | generation method by the shift register of the PN code concerning this invention, (a) shows the production | generation pattern of the PN code by the (7,1) connection method, (b) is (7 , 3) shows a PN code generation pattern by the connection method, and (c) shows a PN code generation pattern by (7, 3, 2, 1). It is explanatory drawing which shows the block circuit of the vehicle equipment concerning this invention. It is a figure which shows the flowchart of the vehicle-mounted apparatus concerning this invention.

Explanation of symbols

4 ... In-vehicle device 5 ... Reading means 9 ... CPU (search means)
10 ... Database

Claims (8)

  A reading means for reading an arrangement pattern comprising a PN code provided in a vehicle and installed in a lane; a database in which code information corresponding to the arrangement pattern is stored to support the running of the vehicle; and the reading means And a search means for searching the read arrangement pattern, wherein the arrangement pattern is different for each lane.   2. The road traffic system according to claim 1, wherein the vehicle has an auto cruise means, and the auto cruise means performs control for each lane based on the arrangement pattern.   The road traffic system according to claim 1 or 2, wherein the database is provided in the vehicle.   The road traffic system according to claim 1 or 2, wherein the database is provided in a server.   The road traffic system according to any one of claims 1 to 4, wherein the search means is provided in the vehicle.   The road traffic system according to any one of claims 1 to 4, wherein the search means is provided in a server.   A reading means for reading an arrangement pattern comprising a PN code provided in a vehicle and installed in a lane; a database in which code information corresponding to the arrangement pattern is stored to support the running of the vehicle; and the reading means Searching means for searching the read arrangement pattern, wherein the arrangement pattern is different for each lane.   8. The vehicle-mounted device according to claim 7, wherein the vehicle includes an auto-cruising unit, and the auto-cruising unit performs control for each lane based on the arrangement pattern.

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