JP2009199257A - Vehicle type discrimination apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle type discrimination apparatus that can reliably detect vehicle types from small vehicles to large automobiles by providing a vehicle stop space in front of a gate of a parking area, dividing the stop space longitudinally and providing loop coils in the zones respectively. <P>SOLUTION: The vehicle stop space 12 is arranged in front of a gate of a parking area, the stop space 12 is divided longitudinally, and the loop coils 1 to 4 are arranged in the zones respectively. The small vehicle detection loop coil 1 for detecting small vehicles such as two-wheeled vehicles is arranged on a reception apparatus side of the vehicle stop space in front of the gate, and the loop coils 1 to 4 are sequentially selectively oscillated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle type identification device, and in particular, by arranging a stop space of a vehicle in front of a gate of a parking lot, dividing the stop space into several parts in the front and rear, and arranging a loop coil in each division section, from a small vehicle The present invention relates to a vehicle type identification device capable of reliably detecting vehicle types up to large vehicles.

There are unmanned machine-managed parking lots in urban areas, but these parking lots are mainly symmetrical to ordinary passenger cars, and are small vehicles such as bicycles and motorcycles, and large vehicles such as trucks and buses. Can't park.
One reason for this is that it is difficult to mechanically determine the size of small vehicles such as bicycles and motorcycles and automobiles.
Therefore, a vehicle type discriminating device for distinguishing between an automobile and a motorcycle has been proposed (for example, Patent Document 1).
JP 2005-122519 A

In Patent Document 1, a vehicle first enters a vehicle type discrimination device by a front wheel discrimination unit configured by a first sensor and a second sensor and a vehicle front detection unit configured by a third sensor and a fourth sensor. If an entry point is specified and the frontmost part of the vehicle enters the vehicle first, the vehicle is identified as a four-wheeled vehicle. If the front wheel enters the vehicle first, this is designated as a two-wheeled vehicle. Is disclosed.
However, although the technique of Patent Document 1 can determine the difference between a four-wheeled vehicle and a two-wheeled vehicle, it cannot determine the size of a four-wheeled vehicle or the difference between a motorcycle and a bicycle. Therefore, there is a problem that the parking fee cannot be set according to the size of all vehicles such as motorcycles, automobiles, and large automobiles.
The present invention has been made in order to solve the conventional problems, and the object of the present invention is to arrange a stop space for the vehicle in front of the gate of the parking lot and divide the stop space into several parts. An object of the present invention is to provide a vehicle type discriminating device that can detect a vehicle type from a small vehicle to a large vehicle by arranging a loop coil in each division section.

  As a means for achieving the above object, in the vehicle type discriminating apparatus according to claim 1, a plurality of loop coils are installed in the stop space of the vehicle, and the oscillation of each loop coil is selectively operated sequentially.

  In the vehicle type identification device according to claim 2, a parking space in which a small vehicle such as a two-wheeled vehicle and an automobile can be parked, a gate provided at the entrance or exit of the parking space to restrict the progress of the vehicle, and provided in front of the gate In a parking lot provided with a receiving device that receives incoming vehicles or outgoing vehicles, a stop space for the vehicle is arranged in front of the gate, the stop space is divided into several parts before and after, and a loop coil is provided for each division The small vehicle detection loop coil which arrange | positions and detects small vehicles, such as a two-wheeled vehicle, has been arrange | positioned at the reception device side of the stop space of the vehicle just before a gate.

  The vehicle type discriminating device according to claim 3 is the vehicle type discriminating device according to claim 1 or 2, wherein the stop space of the vehicle in front of the gate is divided into three, a small automobile detection loop coil is arranged immediately before the gate, and the small automobile is detected. A medium-sized vehicle detection loop coil for detecting a medium-sized vehicle is disposed behind the loop coil, and a large-sized vehicle detection loop coil is disposed behind the medium-sized vehicle detection loop coil.

  The vehicle type discriminating apparatus according to claim 4 is characterized in that, in the vehicle type discriminating apparatus according to any one of claims 1 to 3, a vehicle height or underfloor height detection device using a photoelectric tube sensor is provided in a stop space of the vehicle.

  The vehicle type discriminating device according to claim 5 is the vehicle type discriminating device according to any one of claims 1 to 4, wherein a loop coil is further arranged inside the loop coil so that the underfloor height of the automobile or the size of the metal object can be detected. .

In this invention, the following effects are acquired by employ | adopting the said structure.
Since a plurality of loop coils are installed in the stop space of the vehicle and the oscillation of each loop coil is selectively operated sequentially, the presence of the metal object can be detected without the loop coils interfering with each other.
In addition, the stop space in front of the gate is divided into several parts in the front and rear, and the loop coils are arranged in the respective divided sections, so that each loop coil divided in the front and rear direction detects the presence or absence of a vehicle, thereby detecting a metal object (vehicle). The size occupied in the front-rear direction can be reliably detected.
For example, it is possible to discriminate bicycles, motorcycles (motorcycles), small cars, trucks, microbuses, and large buses.
In addition, since the small vehicle detection loop coil, the medium vehicle detection loop coil, and the large vehicle detection loop coil are arranged, three-stage discrimination is performed in the vehicle.
Since the small vehicle detection loop coil for detecting small vehicles such as two-wheeled vehicles is arranged on the side of the vehicle passageway just before the gate, the small vehicle can be detected reliably and both the two-wheeled vehicle and the automobile can be detected with one gate. It can correspond to.
Furthermore, since the optical tube sensor is arranged for the vehicle body height and the underfloor height, the accuracy of vehicle type detection can be improved by combining with the detection by the loop coil.
In addition, since multiple loop coils are further arranged inside the loop coil, the underfloor height of the automobile or the size of the metal object can be detected from the difference in the sensitivity of the loop coils.

In general, in a machine-managed parking lot that manages a parking lot unattended, a method is adopted in which a loop coil sensor embedded in the ground detects the presence or absence of a parked vehicle that is a metal object.
In the metal object detection device using the loop coil type sensor, an oscillation circuit including the loop coil as a part of the resonance circuit is configured. In a steady state, the oscillation operation is performed at a constant resonance frequency determined by the impedance including the inductance of the loop coil and the capacitance of the capacitor provided in the resonance circuit. When the metal object approaches the loop coil, the inductance of the loop coil changes, so the oscillation frequency and the crest voltage also change. Therefore, by detecting the change in the oscillation frequency or the change in the crest voltage, it is possible to determine the presence of the metal object, that is, the vehicle and the vehicle type.
The present invention utilizes this loop coil type sensor for vehicle type discrimination. Hereinafter, the best mode for carrying out the present invention will be described.

The vehicle type identification device according to the first embodiment is applied to a parking lot having an entrance gate 10, a reception device 11, and a parking space 12, as shown in FIG. The main components are a loop coil 1 to 4 that is arranged in 12) and detects the presence of a vehicle, and an electric circuit that includes the loop coil as a resonance system and performs arithmetic processing on the signal.
The parking lot includes parking spaces for small vehicles such as motorcycles, carts, and wheelchairs, parking spaces for small vehicles such as small passenger cars and ordinary passenger vehicles, parking spaces for medium-sized vehicles such as trucks and microbuses, large trucks, and large vehicles. It has parking spaces for large vehicles such as buses, trailers, and various work vehicles.

The small vehicle is a vehicle made of a metal object smaller than a small automobile, and includes a bicycle made of a metal object in addition to the bicycle, motorcycle, cart, wheelchair, etc. described above.
As a criterion for judging the small, medium and large vehicles, for example, a vehicle having a front and rear length of less than 6 m is a small vehicle, a vehicle having a front and rear length of 6 m to 10 m is a medium vehicle, and a vehicle having a front and rear length of 10 m is a large vehicle. Set. In addition, this reference | standard can be suitably set with the parking lot to apply.
Various vehicles that have entered from the entrance gate 10 of the parking lot are moved to a target parking space suitable for the vehicle and parked. In addition to four-wheel vehicles, automobiles can also park more vehicles such as trailers.

The gate 10 regulates entry of the vehicle into the parking lot, and as shown in FIG. 2, a bar gate is adopted in which the bar 13 supported at one end rotates from the horizontal direction to the vertical direction around the support portion. Yes. The bar gate restricts the passage of all small vehicles such as automobiles and motorcycles.
In addition, as this gate 10, in order to improve the interruption | blocking property, it is also possible to employ | adopt a door type and a shutter type gate.

On the left and right sides of the stop space of the vehicle, there are provided detection sensors 14 for the vehicle body height and the underfloor height by photoelectric tube sensors.
The detection sensor 14 includes a columnar light emitting unit 15 and a columnar light receiving unit 16, detects a communication state of light rays from the light emitting unit 15 to the light receiving unit 16, and stops between the light emitting unit 15 and the light receiving unit 16. It has a function to measure and detect the vehicle body height and underfloor height.
In the present embodiment, the vehicle type is discriminated by the loop coils 1 to 4, but the discrimination accuracy can be increased by combining the detection sensor 14.
For example, in the case of a vehicle illegally raising the vehicle height, the detection sensitivity by the loop coils 1 to 4 is lowered, but by combining information from this detection sensor, a vehicle having a vehicle body height and an underfloor height above a certain level can be obtained. It can be certified as a medium or large vehicle.
As the detection sensor 14, an ultrasonic sensor may be employed.

The reception device 11 is a device that mechanically receives a user, issues a parking ticket in which a parking time is written by detecting the user's entry, and pays a fee.
In addition to issuing a parking ticket, it is possible to apply an authentication device such as a prepaid card or a credit card, or an authentication device that communicates with a mobile terminal such as a mobile phone as the reception device 11. Other mechanisms may be employed as long as the apparatus includes the will confirmation means.
In this reception device 11, the user receives a parking ticket in which his / her vehicle type is displayed and the usage time is entered by issuing a machine, and at the same time as receiving the gate, the gate is opened and the parking space can be entered.
When leaving the car, you can insert the parking ticket into the checkout machine and automatically check it out.

The stop space 12 in front of the gate 10 has a distance at which a vehicle from a normal passenger car to a large bus can be stopped.
When the vehicle stops just before the gate, the reception device 11 is arranged at a position where the parking ticket can be received by reaching out from the driver's seat through the door. In the case of a medium-sized vehicle, a parking ticket is issued from a slightly higher position corresponding to the driver's seat, and in the case of a large vehicle, a parking ticket is issued from a higher position corresponding to the driver's seat.

  In the reception device 11, in order to receive the parking ticket from the driver's seat through the door, in the state where the driver's seat part is located beside the reception device, if the vehicle body is a small car, the vehicle body is in the front part of the stop space, In the case of a medium-sized automobile, the vehicle main body is located in the entire area extending from the front to the center of the stop space, and in the case of a large automobile, the vehicle main body is located in the entire region before and after the stop space (see FIG. 3).

In the vehicle type identification device of the present embodiment, the small vehicle detection loop coil 2 is disposed immediately before the gate of the stop space, and the medium vehicle detection loop coil 3 for medium vehicle detection is disposed behind the small vehicle detection loop coil 2. A large automobile detection loop coil 4 is disposed behind the medium-sized automobile detection loop coil 3.
And the small vehicle detection loop coil 1 which detects small vehicles, such as a two-wheeled vehicle, is arrange | positioned at the reception apparatus 11 side of the vehicle traffic path just before a gate. Although this small vehicle detection loop coil 1 is accommodated in the small automobile detection loop coil 2, since it includes a sequence circuit to be described later, the loop coils can be partially overlapped.

According to the configuration of the present embodiment, when a user receives a parking ticket from the receiving device 11 to park the vehicle, the small vehicle such as a two-wheeled vehicle stops on the small vehicle detection loop coil 1 and thus the small vehicle detection loop coil. 1 is detected. The small car is detected by the loop coils 1 and 2 to stop on the small car detection loop coil 1 and the small car detection loop coil 2.
The medium-sized vehicle is detected by the loop coils 1, 2, 3 to stop on the small vehicle detection loop coil 1, the small vehicle detection loop coil 2 and the medium-sized vehicle detection loop coil 3. The large vehicle is detected by the loop coils 1 to 4 because it stops on the entire area of the small vehicle detection loop coil 1, the small vehicle detection loop coil 2, the medium-sized vehicle detection loop coil 3, and the large vehicle detection loop coil 4.

  According to the detection, when only the small vehicle detection loop coil 1 detects metal, it is determined that the vehicle is a small vehicle. When only the small vehicle detection loop coil 1 and the small vehicle detection loop coil 2 detect metal, it is determined that the vehicle is a small vehicle. When only the small vehicle detection loop coil 1, the small vehicle detection loop coil 2 and the medium vehicle detection loop coil 3 detect metal, it is determined that the vehicle is a medium vehicle. When the small vehicle detection loop coil 1, the small vehicle detection loop coil 2, the medium vehicle detection loop coil 3 and the large vehicle detection loop coil 4 detect metal, it is determined that the vehicle is a large vehicle.

In FIG. 1, when the vehicle approaches the loop coil, the inductance of the loop coil changes, and the oscillation frequency changes according to this change. And the presence or absence of the vehicle on a loop coil is detected by the change of this oscillation frequency.
FIG. 4 is a graph for explaining the transition of the change in the oscillation frequency.
FIG. 4 shows the change in the oscillation frequency recognized by the discrimination circuit, with the frequency (H _Z ) on the vertical axis and the time (t) on the horizontal axis.
As shown in FIG. 4, when a bicycle, a motorcycle, a small car, a truck, or a bus passes over the loop coil, the oscillation frequency increases with the change in the inductance of the loop coil, and the graph rises. When the vehicle moves away, the oscillation frequency returns to the steady state.
When the vehicle passes over the loop coil, the magnitude of the oscillation frequency varies depending on the size of the metal object. That is, the rise of the oscillation frequency is low because the metal object is small in a lightweight bicycle, and the rise of the oscillation frequency is high because the metal object is large in a large automobile. Therefore, the detection line of the oscillation frequency according to the size of each metal object is set, and when the oscillation frequency exceeding the line is confirmed, the presence of each vehicle can be detected.

The electric circuit includes four resonance circuits 5 including the inductances of the loop coils 1 to 4 as a part of the circuit, and an oscillation circuit combined with any one of the four resonance circuits 5. The common amplifying circuit 6 to be configured, four switching circuits 7 provided between the resonance circuits 5 and the common amplifying circuit 6, switching of the four switching circuits 7 and the discrimination circuits 20 to 24 described later. A sequence circuit 8 that sequentially switches the state at a predetermined cycle, and a vehicle type that detects whether or not the vehicle is within a predetermined frequency range determined in advance based on the oscillation frequency of the loop coil 1 sent from the amplifier circuit. Sensitivity discrimination circuit 20, medium sensitivity discrimination circuit 21, small car discrimination circuit 22, medium car discrimination circuit 23, large car discrimination circuit 24, and reception device, gate open based on signals from each discrimination circuit 20-24 And a controller 25 for controlling the like.
The technique described in Japanese Patent No. 3250755 can be adopted as the metal object detection device including the resonance circuit 5, the amplification circuit 6, the switching circuit, and the sequence circuit 8.

The low-sensitivity discrimination circuit 20 confirms the presence of a metal object, such as a bicycle, a wheelchair, or a cart, smaller than the motorcycle (bike) based on the resonance signal due to the inductance change of the loop coil 1.
The medium sensitivity discriminating circuit 21 also confirms the existence of the motorcycle (bike) based on the resonance signal due to the inductance change of the loop coil 1.
The small automobile discriminating circuit 22 confirms the presence of a normal passenger car or the like based on the resonance signal due to the inductance change of the loop coil 2.
The medium-sized automobile discrimination circuit 23 confirms the presence of a medium-sized vehicle such as a truck based on the resonance signal due to the inductance change of the loop coil 3.
The large automobile discriminating circuit 24 confirms the presence of a large vehicle such as a large bus based on the resonance signal due to the inductance change of the loop coil 4.

  The loop coil 1, the resonance circuit 5, the switching circuit 7, the amplifier circuit 6 and the discrimination circuits 20 and 21 constitute one channel. In the embodiment of FIG. 1 to channel # 4 exist. The four loop coils 1 to 4 may be arranged close to each other in the stop space 12. In some cases, adjacent loop coils may be arranged in a state of being overlapped by half.

  The resonance circuit 5 includes a transformer 5a whose primary side is connected to the loop coil 1, and capacitors 5b and 5c connected to the secondary side of the transformer 5a (see FIG. 5). An LC resonance circuit is constituted by the inductance of the loop coil 1 and the capacitances of the capacitors 5b and 5c viewed through the transformer 5a. That is, the resonance circuit 5 includes the loop coil 1 as one element of the resonance system. A midpoint of connection between the capacitors 5b and 5c is grounded, and a pair of signal lines L1 and L2 are led out from a connection point between the capacitors 5b and 5c and the transformer 5a. One signal line L1 is connected to the input side of the amplifier circuit 6 via the switching circuit 7, and the other signal line L2 is connected to the output side of the amplifier circuit 6 via the switching circuit 7.

  The switching circuit 7 includes a photoswitch 7a connected in series to the input-side signal line L1, a photoswitch 7b connected in series to the output-side signal line L2, and an input-side signal line L1 and an output-side signal. A photo switch 7c connected in parallel with the line L2. The photoswitches 7a to 7c are bidirectional switching elements whose on / off states are controlled in accordance with a control signal from the outside. For example, bidirectional optical MOSFETs are used. The photoswitches 7a and 7b are of a type that is off in a steady state and is on only when a control signal is applied. The photoswitch 7c is on in a steady state and has a control signal. Use a type that turns off only when is applied.

  From the sequence circuit 8 shown in FIG. 1, control signals S1 to S4 are sequentially generated and supplied to each switching circuit and discrimination circuit, respectively. For example, when the control signal S1 is supplied to the channel switching circuit 5 of the small vehicle detection loop coil, the photo switches 7a and 7b of the switching circuit 7 are turned on and the photo switch 7c is turned off. Therefore, the resonance circuit 5 is connected between the output side and the input side of the amplifier circuit 6 to constitute an oscillation circuit. On the other hand, since the control signal S1 is simultaneously supplied to the discriminating circuits 20 and 21, the discriminating circuits 20 and 21 are connected by a mechanism similar to the switching circuit or by a known mechanism to form a series of channels.

  The oscillation circuit starts an oscillation operation at a resonance frequency determined by the capacitance of the resonance circuit 5 and the inductance inherent to the loop coil 1, for example, about 50 kHz, and at a predetermined peak voltage. When there is no metal object (vehicle) in the vicinity of the loop coil 1, the resonance frequency is mainly determined by the inductance inherent to the loop coil 1 and the capacitances of the capacitors 5 b and 5 c of the resonance circuit 5. The oscillation output from the amplifier circuit 6 is supplied to the discriminating circuits 20 and 21, and it is determined whether or not the oscillation frequency is within a predetermined specified frequency range or whether the crest voltage is within a specified range. Detected. For example, when a metal object is present in the vicinity of the loop coil 1, the effective inductance and Q of the loop coil 1 change, the oscillation frequency becomes a frequency deviated from the specified frequency, and the peak voltage deviates from the specified range. Therefore, it is possible to determine the presence / absence of the metal object and the vehicle type by detecting this frequency deviation or wave height voltage deviation. The specified frequency may be common to each channel, or may be set independently for each channel according to variations in characteristics of each channel.

  At this time, since the control signals S2 to S4 are not supplied to the switching circuit 7 and the discrimination circuit of the channels of the other loop coils 2 to 4, the photoswitches 7a and 7b of the switching circuit 7 of the other channels are turned off. ing. Therefore, with respect to the other channels, the amplifier circuit 6 and the resonance circuit 5 are separated from each other, and no oscillation operation is performed. In other words, since a plurality of oscillation circuits do not oscillate simultaneously, unnecessary signals such as beat signals are not generated. In other words, the loop coils 1 to 4 are sequentially and selectively operated by the sequence circuit.

  Further, since the photoswitch 7c is turned on simultaneously with the photoswitches 7a and 7b being turned off, both ends of the capacitors 5b and 5c of the resonance circuit 5 are short-circuited. Therefore, the resonance circuit 5 does not operate as an LC resonance circuit, and no resonance frequency exists. Therefore, it is not affected by the resonance frequency of the loop coil 1 of the adjacent channel # 2 during the measurement of the channel # 1, and accurate detection can be performed.

  The detection frequency of the discrimination circuits 20 to 24 is detected for each channel in synchronization with the synchronization signal SW from the sequencer 5, and only the resonance circuit 5 of the selected channel becomes operable, and the resonances of the other channels are detected. All the circuits 5 are deactivated. Therefore, it is possible to accurately identify in which channel the metal object is present in the vicinity of the loop coils 1 to 4.

When the discrimination circuit 21 determines that the motorcycle is a motorcycle based on the resonance signal of the loop coil 1, a discrimination output indicating that the motorcycle is a motorcycle is sent to the controller. Issue a parking ticket for the motorcycle. The user receives the parking ticket and confirms the opening of the gate before entering.
In the above case, both the low sensitivity discriminating device 20 and the medium sensitivity discriminating device 21 detect the presence of a metal object by a change in the oscillation frequency, but when it is detected that the motorcycle is a motorcycle, Since it is clear that it is not a wheelchair, the discrimination information output is performed so that the discrimination output is not transmitted from the medium sensitivity discrimination device 21 to the low sensitivity discrimination device 20 to the controller.
By this discrimination information output, the discrimination output from the low sensitivity discrimination device 20 to the controller 25 is stopped, and a signal is sent to the controller 25 only from the medium sensitivity discrimination device 21.

When the discrimination circuit 24 determines that the vehicle is a large vehicle from the resonance signal of the loop coil 4, a discrimination output indicating that the vehicle is a large vehicle is sent to the controller 25, and the controller operates the receiving device. Issue a parking ticket for a large car with the time of use. The user receives the parking ticket and confirms the opening of the gate before entering.
In this case, all the loop coils 1 to 4 detect the presence of the metal object by the change of the oscillation frequency. However, since it is clear that the vehicle is not a medium-sized vehicle or less, from the large automobile discrimination circuit 24 Outputs discrimination information so that the discrimination output is not transmitted to the controller below the medium-sized automobile discrimination circuit 23.
By this discrimination information output, the discrimination output from the medium-sized automobile discrimination circuit 23 and below to the controller 25 is stopped, and a signal is sent to the controller 25 only from the large automobile discrimination circuit 24.

In the embodiment described above, the common amplifier circuit 6 is used for each channel. However, the present invention is not limited to this, and an amplifier circuit 6 is provided for each channel # 1 to # 4, and the output of each amplifier circuit 6 is buffered. It may be synthesized via a circuit and supplied to the discrimination circuits 20-24. In this configuration, the switching circuit 7 connected between the resonance circuit 5 and the amplifier circuit 6 is provided with a photoswitch connected in parallel between the input-side signal line and the output-side signal line. The photo switch is turned on in a steady state and turned off only when a control signal is applied.
Also in the case of this configuration, the control signals S1 to S4 from the sequence circuit 8 are supplied to the switching circuit 6 and the discrimination circuits 20 to 24 of each channel, as in the embodiment shown in FIG. For example, when the control signal S1 is supplied to the switching circuit 7 of the channel # 1, the photoswitch 7a of the switching circuit 7 is turned off. Therefore, the resonance circuit 5 is connected between the output side and the input side of the amplifier circuit 6 to form an oscillation circuit. This oscillation circuit has a resonance frequency determined by the capacitance of the resonance circuit 5 and the inductance unique to the loop coil 1. Starts oscillating operation.

  At this time, since the control signals S2 to S4 are not supplied to the switching circuits 6 of the other channels # 2 to # 4, the photoswitch 7a of the switching circuit 7 of the other channels # 2 to # 4 is turned on. Yes. Therefore, for the other channels # 2 to # 4, both ends of the capacitors 5b and 5c of the resonance circuit 5 are short-circuited. Therefore, the resonance circuit 5 does not operate as an LC resonance circuit and no oscillation operation is performed.

Next, a vehicle type identification device according to the second embodiment will be described.
As shown in FIG. 6, the vehicle type identification device according to the second embodiment is configured to detect a small vehicle by the small vehicle detection loop coil 2 without installing the small vehicle detection loop coil 1.
As shown in FIG. 4, since bicycles and motorcycles have smaller variations in loop coil inductance and oscillation frequency than four-wheeled vehicles, it is possible to detect a small vehicle by the difference in oscillation frequency.
In other words, the determination line is measured and set according to the size of the metal object, and when the determination line is exceeded, it is detected that the vehicle is an automobile, and when it is equal to or less than the determination line, it is detected that the vehicle is a small vehicle such as a motorcycle.
Other configurations and operations are the same as those in the first embodiment.

Next, a vehicle type identification device according to the third embodiment will be described.
The vehicle type discriminating apparatus of the first and second embodiments is applied to the entrance of the parking lot, while the vehicle type discriminating apparatus of the third embodiment is applied to the exit of the parking lot.
In the above-described embodiment, the reception device 11 has been described as an entrance reception device such as a ticket issuing machine. However, the vehicle type identification device of the third embodiment is one in which the reception device 11 functions as an exit settlement machine.
A user receives a parking ticket by a ticketing machine at the time of warehousing as in a general parking lot, and performs a procedure by the same method as in the above embodiment at the time of evacuation.
That is, by stopping the vehicle in the stop space before the exit gate, the vehicle type is determined by the same method as in the above embodiment, and the fee according to the vehicle type is settled by the reception device (accounting machine). The gate opens and can be shipped.

Next, a vehicle type identification device according to the fourth embodiment will be described.
In the first and third embodiments, the vehicle type identification device according to the fourth embodiment is configured to be able to detect the underfloor height of a car or the size of a metal object by using the difference in sensitivity between adjacent loop coils. .
In FIG. 1, the loop coil 1 is disposed inside the loop coil 2, but when a metal object is present on the loop coil 1, both the loop coil 1 and the loop coil 2 detect the presence of the metal object. That is, when a metal object exists on the loop coil 1, the inductance change of the loop coil 1 positioned immediately below the metal object is large, and the inductance change of the loop coil 2 adjacent to the outside of the loop coil 1 is small. By using this difference in detection, the vehicle underfloor height or the size of a metal object can be detected.

As shown in Table 1, when the bicycle stops on the loop coil 1, the frequency due to the inductance change of the loop coil 1 immediately below the bicycle is detected according to the size of the metal object, and The loop coil 2 detects (small). These frequency signals are subjected to arithmetic processing by the low sensitivity discriminating device 20, the medium sensitivity discriminating device 21, and the small automobile discriminating device 22 to determine that the bicycle is a bicycle.

  When the motorcycle (motorcycle) stops on the loop coil 1, the frequency due to the inductance change of the loop coil 1 directly below the motorcycle is detected according to the size of the metal object, and the motorcycle is detected. The surrounding loop coil 2 detects (small). These frequency signals are processed by the low sensitivity discriminating device 20, the medium sensitivity discriminating device 21, and the small automobile discriminating device 22 to determine that the vehicle is a motorcycle.

  When a small automobile stops on the loop coil 1, the frequency due to the inductance change of the loop coil 1 directly below the automobile is detected according to the size of the metal object, and the surrounding loop coil 2 is also (large) ) Is detected. These frequency signals are subjected to arithmetic processing by the low sensitivity discriminating device 20, the medium sensitivity discriminating device 21, and the small vehicle discriminating device 22 to determine that the vehicle is a small vehicle.

  When a medium-sized vehicle is stopped on the loop coil 1, a metal object is separated from the loop coil 1 due to the floor height, so that the frequency due to the inductance change of the loop coil 1 directly under the medium-sized vehicle is detected (inside) The loop coil 2 detects (large), and the loop coil 3 detects the presence of a vehicle (metal object). These frequency signals are arithmetically processed by the low sensitivity discriminating device 20, the medium sensitivity discriminating device 21, the small car discriminating device 22, and the medium car discriminating device 23, whereby it is determined that the vehicle is a medium car.

  When a large vehicle stops on the loop coil 1, because of the underfloor height, the metal object is separated from the loop coil 1, so the frequency due to the inductance change of the loop coil 1 directly under the large vehicle is detected (inside) The loop coil 2 detects (large), and the loop coils 3 and 4 detect the presence of a vehicle (metal object). These frequency signals are processed by the low-sensitivity discriminator 20, the medium-sensitivity discriminator 21, the small car discriminator 22, the medium car discriminator 23, and the large car discriminator 23, so that it is determined that the vehicle is a large car. .

  When a small automobile with a high underfloor is stopped on the loop coil 1, since the metal object is separated from the loop coil 1 due to the underfloor height, the frequency due to the inductance change of the loop coil 1 directly under the automobile is detected (small). The surrounding loop coil 2 detects (middle). These frequency signals are processed by the low sensitivity discriminating device 20, the medium sensitivity discriminating device 21, and the small vehicle discriminating device 22 to determine that the vehicle is a small vehicle having a high underfloor height.

As described above, in the fourth embodiment, the vehicle type is determined using the loop coils 1 to 4 as in the first and third embodiments. In addition, the difference in sensitivity between adjacent loop coils is calculated. By utilizing this, it is possible to detect the underfloor height of a car or the size of a metal object.
The difference in sensitivity can be detected by finely setting the detection lines shown in FIG.
In addition, as the arrangement position of the loop coil, it is also possible to arrange the loop coils in multiple layers.

Although the embodiments have been described above, the specific configuration of the present invention is not limited to the above-described embodiments, and design changes and the like within a scope not departing from the gist of the invention are included in the present invention.
For example, in the above embodiment, the vehicle type identification device is applied to a parking lot gate, but it can also be applied to an entrance / exit of a toll road.
In the above-described embodiment, the discrimination of the car is set in three stages. However, it is possible to set a plurality of loop coils, and the loop coils are crossed or arranged in a grid pattern. It is also possible.
Further, as shown in FIG. 7, an ultrasonic sensor and an ultrasonic distance sensor are arranged between the positions corresponding to the loop coils 3 and 4 and the loop coils 2 and 3, and these sensors are used to detect the presence of the vehicle or the height of the vehicle. It is also possible to determine the presence of the vehicle and the vehicle type by combining the loop coils 1 and 2 and the phototube sensor.

1 is a schematic configuration diagram of a vehicle type identification device according to a first embodiment. It is explanatory drawing which shows the structure of a gate and an optical tube sensor. It is explanatory drawing which shows the positional relationship of the vehicle in a stop space. It is explanatory drawing which shows transition of the detection wave height according to vehicle type. It is a circuit diagram which shows the detail of a resonance circuit and a switching circuit. It is a schematic block diagram of the vehicle type discrimination | determination apparatus which concerns on 2nd Example. It is a schematic block diagram of the vehicle type discrimination | determination apparatus provided with the ultrasonic sensor and the ultrasonic distance sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Small vehicle detection loop coil 2 Small vehicle detection loop coil 3 Medium vehicle detection loop coil 4 Large vehicle detection loop coil 5 Resonance circuit 6 Amplification circuit 7 Switching circuit 8 Sequence circuit 10 Gate 11 Reception device 12 Stop space 13 Bar 14 Detection sensor 15 Light emitting part 16 Light receiving part

Claims (5)

  A vehicle type discriminating apparatus having a configuration in which a plurality of loop coils are installed in a stop space of a vehicle and the oscillation of each loop coil is selectively operated sequentially. A parking space where small vehicles such as motorcycles and automobiles can be parked, a gate provided at the entrance or exit of the parking space to restrict the progress of the vehicle, and an entrance vehicle or a delivery vehicle provided in front of the gate In a parking lot with a reception device to perform,
Place a stop space of the vehicle in front of the gate, divide the stop space into several parts before and after, place a loop coil in each division section,
2. The vehicle type identification device according to claim 1, wherein a small vehicle detection loop coil for detecting a small vehicle such as a two-wheeled vehicle is disposed on the reception device side of the stop space of the vehicle immediately before the gate. The stop space of the vehicle in front of the gate is divided into three, and a small automobile detection loop coil is arranged just before the gate,
A medium-sized vehicle detection loop coil for medium-sized vehicle detection is placed behind the small vehicle detection loop coil,
3. The vehicle type discriminating apparatus according to claim 1, wherein a large automobile detection loop coil is disposed behind the medium automobile detection loop coil.   The vehicle type discriminating device according to any one of claims 1 to 3, wherein a vehicle height detecting device using a photoelectric tube sensor is provided in a stop space of the vehicle.   The vehicle type discriminating device according to any one of claims 1 to 4, wherein a loop coil is further arranged inside the loop coil so as to detect an underfloor height of a vehicle or a size of a metal object.