JP2922966B2 - Vehicle passage control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a special place in a vehicle traveling path, that is, a doorway of a parking lot, a doorway of a facility for a special vehicle, or a tollgate on a toll road. A vehicle passage control device for controlling vehicle passage restricting means for preventing the passage of vehicles and permitting only vehicles satisfying certain conditions to automatically permit unconditional passage of specific vehicles. About.

[Conventional technology and its problems]

There are special locations in the vehicle operation location that need to be controlled to temporarily regulate the operation of the vehicle. In other words, the purpose is to provide five parking places for vehicles coming to banks and department stores, to enter and exit parking lots with commercial purposes to collect usage fees, and to establish facilities that require entry restriction only to specific vehicles. At the entrance or exit, or at the entrance or exit of a road with a toll section, once stop the operation of the vehicle, pay the fee or confirm that the vehicle meets the conditions, etc. Let it pass.

Many of the passage control devices used in such places are automated. Typical of the passage restricting means are a circuit breaker and a traffic light, which are usually in a state of blocking the passage of a vehicle. Vehicles approaching these are blocked from passing, and stop at the stop position specified by the immediately preceding stop line or the like.

A stopped vehicle is detected by a vehicle detector using a change in inductance of a loop coil buried on a road surface or reflection (or interruption) of infrared rays, and the following procedure is usually performed based on the detection. That is, banks,
In the parking lots of department stores and toll parking lots, check the empty space for parking and issue a parking ticket at the entrance, or return the parking ticket or toll ticket or pay the fee at the exit, toll road In the toll booth, predetermined procedures such as issuance of a toll ticket at the entrance or payment of the toll at the exit are taken, and for vehicles that meet the predetermined conditions, the vehicle passage restriction means is released. , Traffic will be allowed.

Similarly, at the doorway of a specific facility, after procedures such as confirmation of a vehicle, a passenger, or a task by a guard are completed, the vehicle passage restricting means is released, and traffic is permitted.

By the way, if the vehicle to be subjected to the passage control among the above-mentioned points is only a general vehicle, there is no inconvenience even if only a standard condition check is performed, and automation is becoming widespread.

However, inconvenience arises when a vehicle that should be treated specially together with a general vehicle (hereinafter, referred to as a specific vehicle) wants to pass through the same point.

In other words, in the case of a bank, department store, etc. where specific vehicles are mixed, vehicles used by the facility owner may use the same entrance as well as ordinary visitors vehicles. But it is necessary to enter. Also, in the case of a toll parking lot, it is necessary to freely enter and exit a vehicle for which a specific contract is made in advance. Furthermore, on toll roads, emergency vehicles and road maintenance vehicles must be allowed to pass unconditionally, and at entrances and exits to confidential or specially secured facilities, permission is recognized and traffic is allowed. The general public must be blocked.

In such a case, conventionally, the following measures have been taken.

(B) A method of releasing the vehicle passage restricting means by means of a special operation by a passenger using a password, an operation using a special key, or confirming an ID card with a magnetic card reader, provided that the passenger stops. It is necessary to get off and perform a predetermined operation, which is complicated.

(B) A method of releasing the blocking by the vehicle passage restricting means by the remote control operation by the small radio, but the small remote control transmitter is brought into the vehicle and at the same time, the vehicle traffic restricting means side
It is necessary to separately install a receiver and a receiving antenna, which complicates the device. In addition, in the case where a VHF band radio wave is used for the remote control device, there is a possibility that a nearby electronic facility may be adversely affected.

[Problems to be solved by the invention]

The present invention solves the drawbacks of the above-described conventional devices requiring vehicle passage control, and provides a simple device that detects a vehicle using a common loop coil, identifies a specific vehicle, and automatically permits the vehicle to pass. The task is to provide.

[Means for solving the problem]

In order to solve the above problems, according to the present invention, a vehicle passage control device includes: a code generator for setting a code indicating that the vehicle is a specific vehicle;
A code conversion circuit that converts the code into a sequential signal, a modulator that modulates this signal at a specific frequency from an oscillator, and a transmission coil that radiates the output of the modulator as an electromagnetic wave having a specific frequency. A vehicle-mounted transmitting means mounted on a vehicle, a vehicle passage restricting means for preventing or allowing the vehicle to pass on a vehicle traveling road, and a loop coil disposed on a road surface immediately before the vehicle passing restricting means, A vehicle detector connected to the loop coil,
A vehicle detector that uses a frequency different from the specific frequency radiated from the transmission coil and outputs a signal corresponding to a series of inductance changes occurring in the loop coil when a traveling vehicle passes on the loop coil, The electromagnetic wave of the specific frequency radiated from the transmitting coil is selectively received and demodulated, and the identification code is identified from the signal. When the code is a predetermined code, the specific vehicle identification is performed. Specific vehicle identification means for outputting a signal, and based on the specific vehicle identification signal, the vehicle passage restriction means is set to be in a state of permitting the passage of vehicles.

[Action]

On the loop coil, when the specific vehicle transmits an electromagnetic wave mixed with the determined identification code from the transmission coil, the electromagnetic wave is received by the loop coil, and the identification code in the signal is extracted and confirmed. The vehicle is controlled to allow passage of a specific vehicle. The specific frequency of the electromagnetic wave received by the loop coil radiated from this specific vehicle is different from the frequency used by the vehicle detector and is clearly distinguished, so that it can be easily applied without affecting the detection operation. Thus, the loop coil can be used for both functions of vehicle detection and identification of a specific vehicle code.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to the drawings based on examples.

FIG. 1 is an embodiment to which the apparatus of the present invention is applied.
FIG. 2 shows a plan view of a parking lot.

Control of a general vehicle according to the present embodiment will be described below.
At the entrance and exit of the parking lot, vehicle passage restricting means (5) are provided, respectively, which are controlled by the specific vehicle identifying means (6) to prevent or allow the traffic of entering and exiting vehicles.

Loop coils (1), (2), (3) and (4) are embedded on the road surface before and after the vehicle passage restricting means (5), and each terminal is connected to a vehicle detector (10). The loop coils (1) and (3) are further connected to a specific vehicle identification means (6).

In this embodiment, the specific vehicle identification means (6)
Control signals from a parking ticket issuing machine (8), a toll collection machine (9), a vehicle detector (10), and the like are input, and predetermined processing is performed based on these signals. ), And includes a control part for controlling the entrance and exit of the vehicle, but is a well-known part, and therefore, description thereof is omitted in the following description.

The entering vehicle advances from the entrance to just before the vehicle passage restricting means (5), and immediately before the vehicle passage restricting means (5),
When the vehicle stops on the loop coil (1), the inductance of the loop coil (1) changes, and the specific vehicle identification means (6) detects this and issues a parking ticket. When the driver of the vehicle receives the parking ticket from the parking ticket issuing machine (8), the specific vehicle identification means (6) is connected to the vehicle passage restriction means (5).
To raise the arm and release the blocking state. The vehicle reaches the loop coil (2) through the vehicle passage restricting means (5). Upon detecting this, the specific vehicle identification means (6) controls the vehicle passage restriction means (5) and lowers the arm to bring the vehicle into the traffic blocking state again.

On the other hand, when the exiting vehicle advances to just before the vehicle passage restricting means (5) provided at the exit and stops on the loop coil (3), the inductance of the loop coil (3) changes, and the specific vehicle identification occurs. The means (6) detects this, calculates the parking fee, and displays it on the toll collection machine (9). When the driver of the vehicle pays the parking fee to the toll collector (9), the specific vehicle identification means (6) operates the vehicle passage restriction means (5) to raise the arm and release the blocking state. The vehicle reaches the loop coil (4) through the vehicle passage restricting means (5). Upon detecting this, the specific vehicle identification means (6) controls the vehicle passage restriction means (5) and lowers the arm to bring the vehicle into the traffic blocking state again.

The specific vehicle identification means (6) also manages the number of vehicles entering and exiting the parking lot, and stores the current number of vehicles in the parking lot based on the number of vehicles entering and exiting the vehicle. In the case of, the full indicator lamp (7) is turned over to indicate that the vehicle is full, and the parking ticket issuance is suspended.

The control described above is performed on a general vehicle, and the specific vehicle identification means (6) performs different control on the specific vehicle. This operation will be described in detail below.

A control device constituting the present invention controls transmission means mounted on a specific vehicle to be identified, and controls such as detecting an electromagnetic wave signal from the transmission means and identifying a code included in the signal. And specific vehicle identification means.

First, a description will be given of the on-vehicle transmission means constituting the present invention. In FIG. 3, the specific vehicle (19)
Oscillator (21) and transmitting coil (20) connected to it
Is placed. As shown in the block diagram of FIG. 4, the oscillating device (21) includes an oscillator (22) for generating a signal of a predetermined frequency, a code generator (23) for setting a code indicating that the vehicle is a specific vehicle, and A code conversion circuit (24) for converting into a sequential electrical code by a predetermined procedure, and a modulator (26) to which an output of the code conversion circuit (24) is added and an output of the oscillator (22) is FSK-modulated by the code. Contains. The oscillation frequency of the oscillation device (21) is set to about 3 to 10 KHz. It is used by the receiving vehicle detector (10)
This is so that the signal can be clearly separated from a signal of 30 to 100 KHz and that the operation is not mutually affected. In addition,
(25) is a communication control circuit for controlling the operations of the code generator (23) and the code conversion circuit (24). A transmission amplification circuit (24) is connected to the output of the modulator (26), and the signal is amplified and applied to a transmission coil (20) mounted on the bottom surface of the vehicle body. Therefore, an electromagnetic wave corresponding to the modulated signal is radiated from the transmission coil (20).

Next, another part of the present invention, that is, the specific vehicle identification means (6) connected to the loop coils (1) and (3) will be described. As shown in the block diagram of FIG. 2, the loop coils (1) and (3) are connected in parallel to a high-frequency transformer (9) and a high-impedance buffer (11). The vehicle detector (10) to which the loop coils (1) and (3) are connected via the high-frequency transformer (9) is an existing one, and monitors the inductance change of the loop coils (1) and (3). And detects that the inductance has changed under the influence of the vehicle, and issues a vehicle detection signal. In this detection operation, a high-frequency current of about 30 to 100 KHz is used. The high impedance buffer (11) is, for example, a resistor having a high resistance value and connected to the loop coils (1) and (3) so as not to hinder the above-described vehicle detection operation. It has no effect on this, but it passes signals of 3 to 10 KHz from specific vehicles. A signal corresponding to the electromagnetic wave signal transmitted by the specific vehicle via the high impedance buffer (11) and the following low-frequency transformer (12) is demodulated. Low-pass transformer (12)
Is for passing only low-frequency signals, and a low-pass filter may be used instead. The signal that has passed through the low-pass transformer (12) is amplified by a subsequent receiving amplifier circuit (13), then demodulated by a demodulator (14) to extract a code, and further converted by a code conversion circuit (15). After the conversion, the code is identified by the code identification circuit (16). The code discrimination circuit (16) simultaneously compares a code group previously set and stored with the obtained code, and outputs a specific vehicle detection signal when it is determined that the vehicle is a specific vehicle. The means (5) is operated to allow the specific vehicle to pass. The specific vehicle identification means (6) returns the vehicle passage restricting means (5) to the passage blocking state after the specific vehicle has passed.

A single code may be used for the identification described above, but a different code may be assigned to each specific vehicle. In this case, for example, passage records detected at a number of points on the expressway can be centrally managed and totaled, and used for purposes such as grasping the operation state of each vehicle.

〔The invention's effect〕

As described above, according to the present invention, the vehicle passage control device includes: a code generator that sets a code indicating that the vehicle is a specific vehicle;
A code conversion circuit that converts the code into a sequential signal, a modulator that modulates this signal at a specific frequency from an oscillator, and a transmission coil that radiates the output of the modulator as an electromagnetic wave having a specific frequency. The vehicle-mounted transmission means mounted on the vehicle, on the vehicle travel path, vehicle passage restricting means for preventing or allowing the vehicle to pass, and a loop coil disposed on the road surface immediately before the vehicle passage restriction means, A vehicle detector connected to the loop coil, wherein a frequency different from a specific frequency radiated from the transmission coil is used, and a series of inductances generated in the loop coil when a traveling vehicle passes on the loop coil. A vehicle detector that outputs a signal corresponding to the change, and an electromagnetic wave of the specific frequency connected to the loop coil and radiated from the transmission coil Selectively receiving and demodulating, identifying the identification code from the signal, and a specific vehicle identification means for outputting a specific vehicle identification signal when the code is a predetermined one, based on the specific vehicle identification signal. Since the vehicle passage restricting means is configured to allow the vehicle to pass through, it is possible to automatically perform a desired vehicle passage permitting operation for a specific vehicle different from that for a general vehicle. Becomes

In addition, a frequency different from the frequency used for vehicle detection, for example, 3
Low frequency of about 10KHz is used, and the transmission coil and loop coil are placed horizontally with each other and only have to function when facing a short distance, so the electromagnetic wave used is also weak, thus adversely affecting nearby electronic equipment Nothing.

In many cases, a loop coil is already installed at a location to which the present invention is applied for the purpose of vehicle detection, and there is an advantage that the loop coil can be used as it is.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a parking lot provided with the device of the present invention, and FIG. 2 is a block diagram of an embodiment of a specific vehicle identification means and a vehicle detector constituting the present invention. FIG. 3 is a partial cross-sectional side view of a vehicle on which a vehicle-mounted transmitting unit is mounted and a loop coil embedded in a road surface according to the present invention. FIG. 4 is a block diagram of an embodiment of a vehicle-mounted transmitting unit constituting the present invention. Each figure is shown. (1), (3) ... loop coil, (5) ... vehicle passage restricting means, (6) ... specific vehicle identification means, (10) ... vehicle detector, (20) ... transmitting coil, ( 22) Oscillator, (23) Code generator, (24) Code conversion circuit, (26) Modulator.

Claims (1)

(57) [Claims] A code generator for setting a code indicating that the vehicle is a specific vehicle; a code conversion circuit for converting the code into a sequential signal; a modulator for modulating the signal with a specific frequency from an oscillator; An on-vehicle transmitting means mounted on a vehicle, comprising: a transmitting coil for radiating an output of the modulator as an electromagnetic wave of a specific frequency; and a vehicle passing on or off a vehicle traveling path for preventing or allowing the vehicle to pass. Regulating means, a loop coil disposed on a road surface immediately before the vehicle passage regulating means, and a vehicle detector connected to the loop coil, wherein a frequency different from a specific frequency radiated from the transmission coil is used. A vehicle detector that outputs a signal corresponding to a series of inductance changes generated in the loop coil when a traveling vehicle passes over the loop coil; Connected to the transmitter, selectively receives and demodulates the electromagnetic wave of the specific frequency radiated from the transmitting coil, identifies the identification code from the signal, and identifies the specific vehicle identification signal when the code is a predetermined one. And a specific vehicle identification unit that outputs a vehicle passage control device, wherein the vehicle passage control unit is configured to set the vehicle passage restriction unit in a state of permitting the passage of the vehicle based on the specific vehicle identification signal.