JP2955049B2 - Toll collection system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a toll road toll collection system, a wireless communication toll collection system to be applied to unmanned such as parking system.

[0002]

2. Description of the Related Art A non-contact IC card in which a wireless tag for individual identification and an IC (integrated circuit) card have a wireless communication function has been put into practical use as an information medium for an FA system and a toll collection system. These information media are collectively referred to as wireless cards).

A conventional example of a toll collection system using this wireless card will be described with reference to FIG.

In FIG. 3, reference numeral 1 denotes an approach path of a vehicle at a tollgate, reference numerals 2 and 21 denote islands for guiding the traffic of the vehicle, and reference numeral 3 denotes a wireless card mounted on the vehicle.

The toll collection system is based on the islands 2 and 2 described above.
An antenna 4 installed on the vehicle 1 toward the approach path 1 of the vehicle;
A reading device 5 that reads information from the wireless card 3 via the antenna 4 is provided.

When the vehicle passes through the communicable area S of the antenna 4 (indicated by a two-dot chain line), communication with the wireless card 3 is performed, and payment processing is performed unattended.

[0007]

However, in the above-mentioned conventional system, the communication area of the antenna 4 is expanded as shown by S 'in order to secure communication time in order to enable communication even while the vehicle is passing at high speed. There is a need. However, when the communication area is expanded, there is a problem of interference with a communication card of a following vehicle or with a communication card of a vehicle in an adjacent lane.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an array antenna at the back of a tread plate along an approach path of a vehicle, and obtains a running speed of the vehicle from a contact signal of the tread plate. Array antenna pointing according to vehicle speed
Scans communication area according to vehicle speed
A phase shift circuit is provided .

[0009]

According to the present invention , the directivity of the array antenna is
Phase shift control according to the vehicle speed, and the communication area becomes the vehicle speed.
Since it is configured to have a phase shift circuit that scans according to
The communication direction of the array antenna moves following the movement of the vehicle without expanding the communication area of the antenna.

[0010]

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

FIG. 1 is a block diagram showing a configuration of a toll collection system according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an approach path of a vehicle, reference numerals 2 and 21 denote islands, and reference numeral 3 denotes a wireless card mounted on a side of the vehicle or held by a driver. Reference numeral 5 denotes a reading device that reads information from the wireless card 3 via the array antenna 6 and the phase shift circuit 7.

6 is an array antenna, 7 is the antenna
Phase shift control of the directivity of the
The communication area is sequentially scanned as shown in the order of SA → SB → SC
Phase shift circuit. Reference numerals 8 and 81 denote known vehicle detection devices, each of which is constituted by a light-transmitting area sensor, provided with a light screen in a direction perpendicular to the road surface to identify the passage of each vehicle.

Reference numeral 9 denotes a well-known tread, which is a vehicle detection device 8,
It is buried on the road surface below the optical axis 81. Reference numeral 10 denotes a speed detection circuit.

As shown in FIG. 2, a plurality of contact members S1, S2,..., S4 are provided inside the tread plate 9 at regular intervals in the traveling direction of the vehicle. To detect the passing speed and acceleration of the vehicle.

The phase shift circuit 7 is controlled in accordance with the detected speed or acceleration, and the communication area of the array antenna 6 is set to S.
Scan sequentially as A, SB,..., SC.

Accordingly, the communication area also moves with the movement of the wireless card 3, so that the communication time can be increased without expanding the communication area.

[0018]

As described above, according to the present invention,
It is possible to eliminate a reading error due to lack of communication time when a vehicle passes at high speed, and it does not expand the communication area even if the vehicle approaches at low speed, so it does not interfere with subsequent vehicles and has high reliability Communication becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a toll collection system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a contact structure of a tread plate.

FIG. 3 is a block diagram showing a configuration of a conventional toll collection system.

[Explanation of symbols]

1 ... approach road, 2, 21 ... island, 3 ... wireless card,
4 ... antenna, 5 ... reader, 6 ... array antenna, 7
... Phase shift circuit, 8,81 Vehicle detection device, 9 ... Tread, 10
... speed detection circuit, S, S ', SA, SB, Sc ... communication area.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-127391 (JP, A) JP-A-60-257375 (JP, A) JP-A-1-232275 (JP, A) JP-A 61-127 167801 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G07B 15/00 G06K 17/00 G06K 19/00 G01B 7/02 G01S 7/46

Claims (1)

(57) [Claims] 1. A vehicle detection device at a tollgate, a tread plate for detecting a running state of a tire of a vehicle, a speed detection circuit for detecting a vehicle speed from a plurality of contact signals of the tread plate, and a vehicle presentation. Array antenna that reads the wireless card to be read, and the speed or the speed detected by the speed detection circuit.
A toll collection system comprising: a phase shift circuit that scans the array antenna in accordance with acceleration to swing a directional angle; and a reading device that reads information of the wireless card via the array antenna.