JPS5985600A - Advance direction identifier for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [1] Technical Field of the Invention The present invention relates to an improved device for identifying the traveling direction of a vehicle such as a bus traveling along a predetermined route. A trigger signal is sent alternately to paired antennas on the road (8), and the traveling direction of the vehicle is determined from the number of the received antenna, the reception order, and the arrangement of antennas on the vehicle travel route stored in the central operation control unit. It is something that identifies.

[2] Background technology A plurality of pole-mounted antennas are arranged in a predetermined order in the direction of vehicle travel on a vehicle travel path, and vehicle direction information is transmitted by switching these antennas and communicating between the vehicle and a ground station. Communication devices that capture information are well known. For example, JP-A-5
In the invention of No. 6-16464.1, a trigger signal is transmitted from a roadside transceiver to a vehicle intermittently and by sequentially switching transmission antennas. When the vehicle enters the communication area with the road antenna and receives the trigger signal, the signal transmitter/receiver mounted on the vehicle responds to the road antenna and starts communication. After communication is completed, the on-vehicle reception will be locked and no trigger signals will be accepted from the on-road transmitter/receiver! It has been pierced.

In this way, for example, if the antenna number that intersects with the antenna in FIG. 1 is 1 or 8, then 11. The moving direction of the vehicle is a, and conversely, if it is 2 or 4, it can be seen that the vehicle is moving in the direction a.

[8] Problems with the prior art According to the prior art described above, there is no problem in identifying the direction of travel of the vehicle when the vehicle is traveling normally by sequentially communicating with roadside transceivers along a predetermined traveling route. , when the direction of travel of the vehicle changes frequently, and the distance between paired antennas belonging to the same roadside transceiver is short and the communication area overlaps, such as when changing direction in a bus depot area, or when paired antennas belong to the same roadside transmitter/receiver. J: The vehicle changes direction and runs in the opposite direction at the halfway point.
The disadvantage is that it is difficult to distinguish between normal driving and normal driving.

[4.] Purpose of the Invention The purpose of the present invention is to solve the problems of the prior art described above, and to make it possible to identify the direction in which a vehicle is traveling even when the arrangement of roadside transceivers and the order of communication with onboard equipment do not match. This device provides a device that prevents vehicles from changing direction in areas under heavy pressure where the spacing between the two antennas is very short due to space constraints.
5 (this is particularly effective when a vehicle is present in the communication area with both antennas).

[5] Configuration of the Invention The configuration of the present invention will be explained using FIG. 2. A mobile station, such as a bus, is equipped with a receiving and transmitting antenna and a wireless transmitter/receiver. In contrast, a roadside transmitter/receiver (roadside device) connected to the central operation control unit by a communication line, and a roadside antenna that transmits trigger signals from the roadside device to the mobile station or receives signals from the mobile station are fixed on the ground. Configure the station.

The roadside antennas are arranged in one or more pairs along the vehicle travel path, and when the roadside device transmits a trigger signal to the vehicle by alternately using the roadside antennas, a response is made and the vehicle moves. Communication begins between the station and the ground station. At this time, the traveling direction of the vehicle can be identified by identifying the numbers of the communicating mobile station and roadside antenna, and comparing the identification results with a solid device that has previously stored the positions of the roadside device and roadside antenna on the vehicle's travel route. can.

In the present invention, when identifying the traveling direction of a specific vehicle in the above configuration, the mobile station side can respond by responding only once from the roadside device to signals from the same vehicle that are responded to via the same antenna. In addition to reducing the signal processing load, the on-vehicle transceiver is locked after responding once to a signal transmitted from the same on-road antenna, but after a certain period of time or when the on-vehicle receiver responds to the same on-road antenna. When a trigger signal is received via another connected roadside antenna, it is configured to be able to communicate again with the same roadside transceiver.

[6] Best Mode for Carrying Out the Invention In the configuration diagram of the embodiment shown in FIG. Transmitter/receivers 6, 6' and 7.7' are paired antennas arranged along the direction of the vehicle, 8 is a communication line, and 9
1 is a central control unit, 10 is an output device, and 11 is a communication line.

Next, the procedure for communicating between a moving vehicle and a station on the ground will be explained. The road a5 transmits a trigger signal by alternately switching the antennas 6 and 7 at a frequency of, for example, 50 times per second. When the vehicle enters an area where it can communicate with the vehicle via the antenna, and the on-vehicle device 2 receives a trigger signal from the antenna 6, for example, communication is started. When the on-vehicle device 2 completes communication, the on-vehicle reception is locked only to the antenna 6, and the trigger signal sent from the antenna is no longer accepted. Next, the vehicle advances and the on-board aircraft 2 connects to the road antenna 7.
When a trigger signal is received through the antenna, it is locked to the antenna, as in the case of the antenna 6, and at the same time,
The locking mechanism for the antenna 6 is configured to be released.

If the communication areas of the on-road antenna 6 and the adjacent antenna 7 do not overlap as described in item 1 above, it is sufficient to lock the reception of the onboard unit to each on-road antenna. When a vehicle enters a point where the communication areas of Received. However, even in such a case, the above-mentioned lock function only works for one antenna for one roadside vehicle, and all trigger signals with different antenna numbers are In response to the trigger signal, the onboard device [receives] -
[Reply] - [Lock] - [Received from antenna of other number]
- [Unlocking] - [Responding to the roadside device via the antenna of another number] - [Locking to the antenna of another number] It will constantly respond to the roadside device.

In the present invention, in response to the above-mentioned response from Todai,
On the roadside transmitter/receiver side, the ``previously communicated in-vehicle device number'' for each antenna is extracted from the response signal of the vehicle and stored.
From the contents of the on-vehicle response signal, the same on-vehicle response after the second reception is ignored for each on-road antenna, and the on-vehicle response to the response is not transmitted to the on-vehicle, but the central control The same shall be applied to device 9.

All of the above-mentioned communications are performed by program commands from the central controller 9. The result of the above communication is recorded and outputted to the output device 10, and data is supplied to other control systems via the communication line 11, for example, to control lamps for bus priority signal control or to bus stops. The bus is displayed on the display system along with the entry time of the bus and display information related to the bus, such as bus number, bus passing time, bus system, etc.

In the embodiment of the present invention, as shown in FIG. 3, there are 4.
4 antennas 617.6'l7' were installed, and these 4 antennas were installed.
Communication is performed while switching between two antennas.

In other words, the communicating antenna number is 6-7, or 7'=6
If the order is 'upward direction', 7-6, or 6'-7'
If the order is , it is sufficient to set it as the "downward direction".

The central control unit issues predetermined commands regarding which vehicle number and what kind of command to issue when going up, and the central control unit confirms whether the vehicle is passing a specific point in the up or down direction and sends the related parts. Sends control signals, etc. to the location.

Next, the processing routine carried out in the microcomputer of the road machine in the above configuration will be explained with reference to FIG.

When the power is turned on, this routine is started and the antenna number used for communication is set to 1″ of the initial field [Step ■]
From then on, the process of [steps ■ to ■] is performed while sequentially switching the antenna numbers until the power is turned off. [Step■]
In this step, a trigger signal is transmitted to the on-vehicle transceiver, and this step is performed unconditionally in response to antenna switching.

[Step ■] waits for a certain period of time after transmitting the trigger, and if there is no onboard response, it is determined that there is no onboard transceiver with which to communicate, and the process moves to [Step ■]. If there is an on-board response within a certain period of time, the process moves to [step (2)] where communication data with the on-board transceiver is transmitted to the central control unit. In [Step ■], the previous communication vehicle number stored for each roadside antenna and the communication vehicle number extracted from the current vehicle response are compared, and if they are the same, subsequent processing is unnecessary [Step ■].
], but if they are not the same, process [steps ■ to ■]. [Step ■] memorizes the car number with which the current communication was made for each antenna, and [Step ■] transmits the road response to the on-vehicle transceiver.

[Step ■] is a routine for switching antenna numbers. If the number of antennas is n, the antenna numbers are l-2, 2-3, ... (n -1)-+n, and n-+1. This process realizes the following processing.

Next, the processing routine of the microcomputer of the on-vehicle transceiver will be explained with reference to the flowchart of FIG. When the power is turned on, this routine is activated and repeats the processing of [steps ■ to ■] until the power is turned off. In [Step ■], a trigger signal is received from the roadside transceiver. [Step■
] If there is no trigger signal, the process returns to receiving the next trigger signal, and as soon as the reception of the l trigger signal is completed [Step ■]
Next, it is checked whether the roadside antenna number belonging to the target roadside device is locked. If the vehicle is locked, the process returns to [step ■], and if it is not locked, an on-vehicle response is performed [step ■] and an on-road response is received [step ■]. As soon as step (2) is completed, whether the process ends normally or abnormally, the process returns to step (2).

[7] Effects of the Invention The present invention provides a bus garage where the direction of the vehicle is frequently changed when identifying the traveling direction of the vehicle based on the array and identification number of the roadside antennas through which the vehicle communicates and the order in which the vehicle passes. It is also effective even when driving indoors, etc., and since the spacing between paired antennas is short, the direction of travel of the vehicle can be reliably identified even when the communication areas from the same on-vehicle unit overlap.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the prior art. FIG. 2 is a detailed diagram of the present invention, in which (1) shows a ground station and (2) shows a mobile station. FIG. 3 is an embodiment showing a two-shell configuration of the communication device of the present invention. 4th. It is a diagram showing the communication data flow of the IY-th road transmitter/receiver and the communication data flow of the 5th jA-exit vehicle. DESCRIPTION OF SYMBOLS 1... Vehicle, 2... On-vehicle transceiver, 3... Vehicle antenna, 4... Pillar, 5... Road transceiver, 6゜6
', 7, 7'...Road antenna, 8...Communication line, 9...Central control unit, lO...Output device, 11
...Interconnection communication line. Ren 2 figure 3 figure "7------" 1 ■4 figure 75 figure 563

Claims (2)

[Claims] (1) When a vehicle enters the communication area between a roadside transceiver placed along a predetermined vehicle travel route and the roadside transceiver, a trigger signal is sent to the vehicle, and an identification signal is sent from the vehicle. In a vehicle traveling direction identification device consisting of one pair or multiple pairs of receiving and transmitting roadside antennas for receiving responses including responses, means for alternately switching the antennas of the roadway transceiver, A means of repeatedly communicating with an antenna with an antenna number after a certain period of time has elapsed after communication, or after communicating with another antenna connected to the same on-road device, and after communication is completed, transmitting the antenna number from the road transceiver to the central control unit. A vehicle traveling direction identification device that identifies the traveling direction of the vehicle based on the order of transmitted and communicated antenna numbers. (2) When a vehicle enters the communication area between a roadside transceiver placed along a predetermined travel route and the roadside transceiver, a trigger signal is sent to the tram, and a vehicle number identification signal is sent. In a vehicle traveling direction identification device comprising one pair or multiple pairs of receiving and transmitting roadside antennas for receiving responses related to the vehicle, including responses from a wireless transmitter/receiver mounted on the vehicle, means for identifying a vehicle number from a response signal from a vehicle; a means for storing the identified vehicle number; and a communication vehicle identified and stored from a response from a previous vehicle received via the same road antenna. A vehicle traveling direction identification device comprising means for comparing a number and a newly stored vehicle number, and means for canceling communication with the vehicle if the two numbers are the same as a result of the comparison.