JP4650193B2 - Overloading vehicle detection system and detection method - Google Patents

Description

  The present invention relates to a detection system and a detection method for detecting an overloaded vehicle using an axle load sensor provided on a road surface.

  In order to preserve the structure of the road or prevent traffic hazards, the Road Law (Act No. 180 of 1927) restricts the width, weight, height, and length of vehicles to a certain range. Anything that exceeds the maximum limit shall not be allowed to pass through the road without permission from the road administrator (Minister of Land, Infrastructure, Transport and Tourism or prefecture). The specific maximum value is stipulated in the Vehicle Restriction Ordinance. Therefore, a system that measures the weight, dimensions, etc. of a traveling vehicle has been used in the past in order to control vehicles that violate laws and regulations that are unauthorized due to excess weight.

  As a system for measuring the weight of a traveling vehicle, an axle weight measurement system is known in which an axle weight sensor is embedded in a road surface and the total weight of the vehicle is measured based on the axle weight obtained from the axle weight sensor. The axle load sensor is a sensor that detects a load in the vertical direction that the axle of the traveling vehicle applies to the road surface, that is, an axle load, and is composed of a rod-like sensor including a piezoelectric element such as a crystal. The following Patent Document 1 describes an example of an axle load measuring system using an axle weight sensor.

  As a method for detecting an overloaded vehicle in which the weight of the load exceeds a specified value, there are methods described in Patent Documents 2 to 5, for example. In Patent Document 2, the allowable load of the vehicle is accurately found by comparing the data of the total length, the distance between the axes, and the number of axes detected from the vehicle speed with the registered vehicle specifications, and this is measured. Overloading is determined by comparing with the total vehicle weight. In patent document 3, based on the vehicle number detected by the camera, the vehicle weight and the permitted load weight of the special vehicle corresponding to the vehicle number are acquired from the total processing device, and from the added value of the acquired vehicle weight and the permitted load weight However, when the total weight measured by the axle weight meter is heavier, this special vehicle is determined to be an overloaded vehicle. In Patent Document 4, total weight setting means for setting and storing the total vehicle weight is provided, and the total vehicle weight is compared with the integrated value of the axle weight per vehicle, and the integrated value exceeds the total vehicle weight. In the event of an overload, an overload warning is issued. In Patent Document 5, first and second sensors for measuring axle weight are provided, and the axle weights of the lorries detected by the first and second sensors are both set values corresponding to the allowable weight of the lorries. An overload warning signal is issued when the value exceeds.

JP 2001-101568 A JP 2000-149184 A JP 2002-183882 A JP-A-8-285665 Japanese Patent No. 3074368

  In the conventional overloading vehicle detection method as described above, in order to determine overloading, it is necessary to obtain the permitted load load data of the vehicle, and for that purpose, means for identifying the vehicle And storage means for storing the permitted load capacity of the vehicle is required. However, the permitted load data is enormous, and it is difficult to easily obtain it as a database. Even if it can be obtained, the amount of data is enormous, so a large-capacity storage device is required and the cost increases. Furthermore, since it is possible to determine overload only for vehicles in which permitted load data is stored, other vehicles cannot be determined, and vehicles that cannot be identified, For example, even in the case of a vehicle whose vehicle number cannot be read, there is a problem that it is not possible to determine overloading. In particular, vehicles that are intentionally overloaded are often crafted such as bending the number plate so that the vehicle number cannot be read, making it difficult to determine overloading.

  The present invention solves the above-described problems, and the object of the present invention is not to use a means for specifying a vehicle or a storage means for storing data on the permitted load capacity of the vehicle. Another object is to detect overloaded vehicles. Another object of the present invention is to detect an overloaded vehicle using an existing axle load measuring system.

An overload vehicle detection system according to the present invention includes an axle load sensor disposed on a road surface, a measurement unit that measures the axle load and the number of axes of a traveling vehicle based on a detection output of the axle load sensor, and the measurement unit. When the number of axes measured in step 2 is 2, the axle load ratio of the traveling vehicle is compared with a predetermined threshold, and the traveling vehicle is suspected of being overloaded or overloaded based on the comparison result. And a determination means for determining a vehicle . Here, the “shaft weight ratio” is the ratio of the rear shaft axle weight to the front axle axle weight of the vehicle,
Axial weight ratio = defined by the rear axle weight / front axle weight. In the present invention, the threshold value ranges from a minimum axle weight ratio when the distribution ratio of the weight of the loaded load to the front axle is a maximum value to a maximum axle weight ratio when the distribution ratio is the minimum value. Set to a range value.

Further, the overload vehicle detection method according to the present invention includes an axle load sensor provided on the road surface, a measuring means for measuring the axle load and the number of axes of the traveling vehicle, and whether or not the traveling vehicle is an overloaded vehicle. A method for detecting an overloaded vehicle using a determination unit that performs a step of measuring a shaft weight and the number of axes of a traveling vehicle based on a detection output of a shaft weight sensor, and a measured number of axes. in the case of but two axes, the decision means compares the axle load ratio and the threshold value of the traveling vehicle, based on the comparison result, the vehicle with the traveling vehicle is suspected overloaded vehicles or overloaded Determining.

  The detection of the overloaded vehicle in the present invention is based on the following principle. In general, in a vehicle such as a truck (hereinafter referred to as “two-axis vehicle”) having only two front and rear axles, the weight of the front axle and the rear axle when no load is loaded. It has been found statistically that the ratio to axle load is approximately 2: 1. It has also been statistically found that the load capacity (maximum load capacity) of the load that can be loaded on the two-axis vehicle is approximately equal to the total weight of the vehicle when empty. The load of the loaded load is mainly applied to the rear shaft, but a part is also distributed to the front shaft. Although this distribution ratio varies depending on the loading condition of the load, it is statistically known that at least 1/50 of the load and at most 1/6 of the load are distributed to the front shaft. As will be described in detail later, when a load having the maximum loading capacity is loaded, the axle load ratio becomes the maximum when the distribution ratio to the front axle is 1/50, which is a value of 1.9. Further, when the distribution ratio to the front shaft is 1/6, the shaft weight ratio is minimum, which is 1.4. Therefore, using this axle weight ratio, for example, vehicles with an axle weight ratio smaller than 1.4 are vehicles that comply with the loading capacity, and vehicles with an axle weight ratio of 1.4 to 1.9 are suspected of being overloaded. A vehicle having an axle weight ratio of greater than 1.9 can clearly be determined as an overloaded vehicle that does not comply with the loading capacity. Since the above principle applies to all the two-axis vehicles, by using this principle, it is possible to detect an overloaded vehicle without specifying the vehicle.

  As described above, in the present invention, the axle load ratio of the vehicle is compared with the threshold value, and based on the comparison result, it is determined whether or not the vehicle is an overloaded vehicle, so that no means for specifying the vehicle is required. In addition, the storage means for storing the permitted payload data becomes unnecessary, and it is possible to determine an overloaded vehicle with respect to a general traveling vehicle with a simple configuration. Further, overloading can be determined even for a vehicle for which data is not registered or a vehicle in which the vehicle number cannot be read and the vehicle cannot be specified. Furthermore, since the axle load ratio can be obtained from the output of the axle load sensor, it can be easily realized using an existing axle load measuring system.

  The system of the present invention includes a reading unit that reads license plate information of a traveling vehicle, and a display that displays a warning together with the license plate information read by the reading unit for a traveling vehicle that is determined as an overloaded vehicle by the determination unit. And a means. According to this, it is possible to suppress malicious overloading by notifying the driver of excess weight.

  The system of the present invention further includes reading means for reading the license plate information of the traveling vehicle, and recording means for recording the license plate information read by the reading means for the traveling vehicle determined to be an overloaded vehicle. It may be provided. According to this, it is possible to strengthen overload control by accumulating license plate information of overloaded vehicles and making it a so-called black list.

  According to the present invention, it is possible to determine an overloaded vehicle with a simple configuration without using a means for specifying a vehicle or a storage means for storing data on permitted payload. Further, it can be easily realized by using an existing axle load measuring system.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of an overloaded vehicle detection system 100 according to the present invention. Here, the road which has the lane 1 and the lane 2 as a one side multiple lane is mentioned as an example.

  In the lane 1, 10 is a vehicle traveling in the direction of the arrow, 11 is an axle weight sensor that detects the axle weight of the vehicle 10, and 12 and 13 are loop coils for detecting the vehicle 10. The axial load sensor 11 and the loop coils 12 and 13 are both embedded in the road surface. The inductance of the loop coils 12 and 13 changes when the vehicle 10 passes over them, and the vehicle 10 is detected based on the change in inductance. The axle load sensor 11 is composed of a rod-shaped sensor provided with a piezoelectric element, and a plurality (three in the figure) are arranged at predetermined intervals in the traveling direction of the vehicle 10. When the axle weight of the vehicle 10 is applied to the axle weight sensor 11, a current proportional to the axle weight is output from each of the axle weight sensors 11. Reference numeral 14 denotes an axle weight measuring unit that measures the axle weight and the number of axes of the traveling vehicle from the detection output of the axle weight sensor 11.

  In the lane 2, 21 is an axle load sensor, 22 and 23 are vehicle detection loop coils, and 24 is an axle load measuring unit that measures the axle load and the number of axes of the traveling vehicle from the detection output of the axle load sensor 21. These are the same as the axle load sensor 11, the loop coils 12 and 13, and the axle load measuring unit 14 of the lane 1, respectively.

  Reference numeral 15 denotes a roadside control unit that determines whether or not the traveling vehicle is an overloaded vehicle based on the measurement results of the axle load measuring units 14 and 24 and performs processing such as calculating the total weight of the overloaded vehicle. . The axle load measuring units 14 and 24 and the roadside controller 15 are provided in the vicinity of the axle load sensors 11 and 21 and the loop coils 12, 13, 22, and 23. The axle load measuring units 14 and 24 and the roadside control unit 15 may be separate units or may be housed together in the same unit. Reference numeral 16 denotes a host device composed of, for example, a simple server, and is installed in a management office in another place away from the axle load measuring units 14 and 24 and the roadside control unit 15. The roadside control unit 15 transmits predetermined data to the host device 16.

  Reference numerals 17 and 27 denote cameras for picking up images of the traveling vehicle, which are arranged above the loop coils 13 and 23. The cameras 17 and 27 constitute one embodiment of the reading means in the present invention. Reference numerals 18 and 28 are display boards each composed of an LED display for displaying a warning to the traveling vehicle, and are arranged overhead several hundred meters from the cameras 17 and 27. The display boards 18 and 28 constitute an embodiment of the display means in the present invention. Outputs of the cameras 17 and 27 are given to the roadside control unit 15, and the display boards 18 and 28 are controlled by the roadside control unit 15.

  FIG. 2 is a block diagram showing an electrical configuration of the axle load measuring unit 14. Since this configuration is the same for the axial load measuring unit 24, the block diagram of the axial load measuring unit 24 is not shown. In FIG. 2, 141 is a vehicle detection unit that detects a vehicle based on changes in the inductance of the loop coils 12 and 13, 142 is a converter that converts the current output from the axle load sensor 11 into a voltage, and performs amplification and A / D conversion. 143 is a timing circuit that counts the current time, 144 is a communication unit that communicates with the roadside control unit 15, 145 is a storage unit that includes a memory such as a ROM or a RAM, and 146 is an entire unit. It is a CPU that controls operations and performs operations such as axle load and the number of axes. Data such as axle load and the number of axes are temporarily stored in the storage unit 145 together with the time measured by the timing circuit 143 and the vehicle information obtained by the vehicle detection unit 141. The communication unit 144 transmits data such as axle load stored in the storage unit 145 to the roadside control unit 15. The axle load measuring units 14 and 24 constitute an embodiment of the measuring means in the present invention.

  FIG. 3 is a block diagram showing an electrical configuration of the roadside control unit 15. Reference numeral 151 denotes a data processing unit that processes data sent from the axial load measuring units 14 and 24 and the cameras 17 and 27, and includes a microcomputer, an image processing circuit, and the like. Reference numeral 152 denotes a display control unit that controls display on the display boards 18 and 28, 153 denotes a communication unit that communicates with the host device 16, and 154 denotes a storage unit that includes a memory such as a ROM or a RAM. The data processing unit 151 determines whether or not the traveling vehicle is an overloaded vehicle according to a procedure described later based on the measurement results of the axle load measurement units 14 and 24, and based on the measurement result, the total weight of the traveling vehicle. Is calculated. The data processing unit 151 processes the license plate information image of the vehicle captured by the cameras 17 and 27. The data processing unit 151 constitutes an embodiment of the determination means in the present invention. The display control unit 152 creates a predetermined warning message based on the determination result of overloading in the data processing unit 151 and the calculation result of the vehicle weight, and sends it to the display plates 18 and 28 together with the license plate information of the vehicle. Send. The communication unit 153 transmits the weight of the vehicle determined by the data processing unit 151 as an overloaded vehicle, license plate information, and the like to the host device 16. The storage unit 154 stores determination results and calculation results in the data processing unit 151, license plate information, and the like.

  FIG. 4 is a block diagram showing the electrical configuration of the host device 16. The host device 16 is configured as a simple server. 161 is a communication unit that communicates with the roadside control unit 15, 162 is a storage unit that stores data received from the roadside control unit 15, 163 is a data file provided in the storage unit 162, and 164 displays the received data. A monitor 165 such as a liquid crystal display is a warning light that is turned on when an overloaded vehicle is detected. The data file 163 stores license plate information, weight data, and the like of overloaded vehicles. This data file 163 constitutes one embodiment of the recording means in the present invention.

  Next, an overloaded vehicle detection method according to the present invention will be described. FIG. 5 is a diagram for explaining the principle of overload detection. FIG. 5A shows an unloaded state where no load is loaded on the vehicle, and FIG. 5B shows a loaded state where a load is loaded on the vehicle. Reference numeral 10 denotes a biaxial vehicle (truck), 10a denotes a front axle of the biaxial vehicle 10, 10b denotes a rear axle of the biaxial vehicle 10, and 10c denotes a load loaded on the biaxial vehicle 10.

  In general, it has been statistically found that the ratio of the axle weight of the front axle to the axle of the rear axle when the biaxial vehicle 10 is in an empty state is approximately 2: 1. Therefore, in the empty state of FIG. 5 (a), for the sake of simplicity, assuming that the axle weight of the front shaft 10a of the biaxial vehicle 10 is Wa = 1 (unit is tons, the same applies hereinafter), the rear shaft 10b The axial weight is Wb = 0.5. The total weight Z (when empty) of the biaxial vehicle 10 at this time is Z = 1 + 0.5 = 1.5. In addition, the load capacity (maximum load capacity) of a load that can be loaded on an unloaded two-axle vehicle may be approximately equal to the total weight (1.5 in this case) of the unloaded vehicle. Statistically known. Therefore, the two-axle vehicle 10 in an unloaded state can be loaded with a load up to 1.5, and if the load exceeds 1.5, it is overloaded.

As shown in FIG. 5B, when a load 10c having a weight W of 1.5 (maximum loading capacity) is loaded on the biaxial vehicle 10, the load of the load 10c is mainly applied to the rear shaft 10b. , A part is also distributed to the front shaft 10a. Although this distribution ratio varies depending on the loading condition of the load 10c, it is statistically known that at least 1/50 of the load 10c, and at most 1/6 of the load 10c is distributed to the front shaft 10a. In FIG. 5B, out of the weight W (= 1.5) of the load 10c, if the weight distributed to the front shaft 10a is α and the weight distributed to the rear shaft 10b is β, the axis of the front shaft 10a The weight is Wa = 1 + α, and the weight of the rear shaft 10b is Wb = 0.5 + β. At this time, the total weight Z of the biaxial vehicle 10 loaded with the load 10c is:
Z = (1 + α) + (0.5 + β) = 1.5 + (α + β) = 1.5 + 1.5 = 3.0
It becomes. Further, if the axial weight ratio (= the axial weight of the rear shaft 10b / the axial weight of the front shaft 10a) is γ, the axial weight ratio γ is
γ = (0.5 + β) / (1 + α) (1)
As required.

Here, when the distribution ratio of the weight W of the load 10c to the front shaft 10a is 1/6 (maximum value), the values of α and β are as follows.
α = W × (1/6) = 1.5 × (1/6) = 0.25
β = 1.5−α = 1.5−0.25 = 1.25
Therefore, the axial load ratio γ in this case is obtained by substituting α and β into the equation (1).
γ = (0.5 + 1.25) / (1 + 0.25) = 1.4
It becomes.

Further, when the distribution ratio of the weight W of the load 10c to the front shaft 10a is 1/50 (minimum value), the values of α and β are as follows.
α = W × (1/50) = 1.5 × (1/50) = 0.03
β = 1.5−α = 1.5−0.03 = 1.47
Therefore, the axial load ratio γ in this case is obtained by substituting α and β into the equation (1).
γ = (0.5 + 1.47) / (1 + 0.03) = 1.9
It becomes.

  From the above, when the distribution ratio of the weight W of the load 10c to the front shaft 10a is 1/50, the shaft weight ratio γ becomes the maximum value 1.9, and when the distribution ratio to the front shaft 10a is 1/6, the shaft The weight ratio γ has a minimum value of 1.4. Then, as the weight W of the load 10c to be loaded increases, the axle load applied to the rear shaft 10b increases. Therefore, when W exceeds 1.5, the axle load ratio becomes larger than the value obtained above. On the other hand, as the weight W of the loaded load 10c decreases, the axle load applied to the rear shaft 10b decreases. Therefore, when W is less than 1.5, the axle load ratio becomes smaller than the value obtained above. Therefore, if the axle load ratio is smaller than 1.4, the biaxial vehicle 10 is regarded as a vehicle that complies with the loading capacity, and there is no problem. On the other hand, if the axle load ratio is larger than 1.9, the biaxial vehicle 10 can be regarded as an overloaded vehicle carrying a load that clearly exceeds the specified weight. The biaxial vehicle 10 having an axle weight ratio of 1.4 to 1.9 is a so-called gray zone vehicle that is suspected of being overloaded. In the present invention, based on the principle described above, it is determined whether the traveling vehicle is an overloaded vehicle by comparing the axle load ratio with a threshold value.

  Next, a specific method for detecting an overloaded vehicle and a process when overloading is detected will be described. FIG. 6 is a flowchart showing a series of procedures for overloading in the system of FIG. In addition, since the process in the lane 1 and the lane 2 is the same, the process in the lane 1 is demonstrated below. In step S <b> 1, the axle weight measuring unit 14 measures the axle weight and the number of axes based on the output of the axle weight sensor 11. The axle load is obtained, for example, by adding the outputs of a plurality of axle load sensors 11 (three in FIG. 1) for each of the front axle 10a and the rear axle 10b and calculating an average value thereof. The number of axes is obtained from the number of times that any of the plurality of axle weight sensors 11 detects the axle weight within a predetermined time, for example. These calculations are performed by the CPU 146 (FIG. 2) of the axle load measuring unit 14.

  In step S2, it is determined whether or not the value of the number of axes measured by the axle load measuring unit 14 is 2, that is, whether or not the traveling vehicle is a 2-axis vehicle. If the traveling vehicle is not a biaxial vehicle (step S2: NO), the process returns to step S1 to measure the axle load and the like for the next vehicle. If the traveling vehicle is a biaxial vehicle (step S2: YES), step Proceeding to S <b> 3, the measured data such as axle load is transmitted to the roadside control unit 15. At this time, the time information at the time of detecting the axial load timed by the time measuring circuit 143 is also transmitted.

  The roadside control unit 15 calculates the above-described axle load ratio γ using the axle weight value of the front shaft 10a and the axle weight value of the rear shaft 10b received from the axle weight measuring unit 14 (step S4). Then, the calculated axle load ratio γ is compared with a threshold value to determine whether the axle load ratio γ is larger than the threshold value (step S5). This determination is performed in the data processing unit 151 of FIG. For example, the threshold is set to 1.9 (maximum value). If the axle load ratio γ is not larger than the threshold value (step S5: NO), the biaxial vehicle is regarded as a vehicle that observes the loading capacity, and the process returns to step S1 to perform measurement for the next vehicle. On the other hand, if the axle load ratio γ is larger than the threshold (step S5: YES), it is determined that the biaxial vehicle is an overloaded vehicle that does not comply with the loaded capacity (step S6), and the process proceeds to step S7. .

  In step S <b> 7, the camera 17 picks up an image of the license plate of the vehicle determined to be an overloaded vehicle. When the license plate information is acquired by this imaging, the road-side control unit 15 subsequently transmits a warning message and the vehicle license plate information captured by the camera 17 to the display board 18 and displays them on the display board. 18 is displayed (step S8). FIG. 7 shows an example of warning display in this case. Here, the overweight message M and the license plate information N are alternately displayed at regular time intervals. Thus, by displaying the warning message M together with the license plate information N on the display plate 18, it is possible to notify the driver of the excess weight and to suppress malicious overloading.

  Next, in step S <b> 9, the roadside control unit 15 transmits overloaded vehicle data to the host device 16. This data includes time information and the like in addition to the weight of the vehicle determined to be overloaded and license plate information. When the host device 16 receives this data, the warning lamp 165 (FIG. 4) is lit in step S10. When the warning lamp 165 is turned on, the attendant learns that an overloaded vehicle has been detected, and performs an operation for guiding the vehicle to a retracted lane (not shown) bypassed from the lane. The pull-in lane is provided with a stationary weight meter that measures the weight of the vehicle when it is stationary.

  In parallel with the lighting of the warning lamp 165 as described above, the host device 16 records the data received from the roadside control unit 15 in the data file 163 (FIG. 4) of the storage unit 162 in step S11. As a result, license plate information of overloaded vehicles is accumulated to create a so-called black list, and overload control can be strengthened based on this list.

  In the above example, it is determined whether or not the vehicle is a biaxial vehicle (step S2) in the axle load measuring unit 14, and if the vehicle is a biaxial vehicle, measurement data is transmitted to the roadside control unit 15 (step S3). However, all the measurement data of the axle load measuring unit 14 is transmitted to the roadside control unit 15, and the roadside control unit 15 determines whether or not the vehicle is a biaxial vehicle. You may make it determine whether or not.

  Thus, according to the above-described embodiment, it is possible to determine that the vehicle is an overloaded vehicle if the axle load ratio is greater than the threshold value by comparing the axle load ratio of the vehicle with the threshold value. Since this principle applies to all two-axle vehicles, according to the method of the present invention, an overloaded vehicle can be detected without specifying the vehicle. Accordingly, a means for specifying the vehicle is not required, and a storage means for storing the permitted load data is not required. Therefore, the overloaded vehicle can be determined with a simple configuration. Further, overloading can be determined even for a vehicle in which data is not registered or a vehicle in which the vehicle cannot be identified, for example, a vehicle in which the vehicle number cannot be read because the license plate is bent or otherwise crafted. Furthermore, since the axle load ratio can be obtained from the outputs of the axle load sensors 11 and 21, the present invention can be easily realized using an existing axle load measuring system.

  In addition, although the detection target of overloading according to the present invention is limited to a two-axis vehicle, an actual survey has confirmed that an actual overloading vehicle has an overwhelmingly large number of two-axis vehicles. By detecting overloading, most overloaded vehicles can be controlled.

  In the above embodiment, since the threshold value of the axle load ratio is set to the maximum value of 1.9, it is possible to reliably detect only vehicles that are clearly considered to be overloaded. However, the present invention is not limited to this, and the threshold value may be set to a minimum value of 1.4. In this case, a gray zone vehicle suspected of being overloaded can also be detected. Further, the threshold value may be set to an arbitrary value between 1.4 and 1.9 or a value slightly larger than 1.9.

  In the above-described embodiment, a plurality of axle load sensors 11 and 21 are arranged in the traveling direction of the vehicle, but one axle load sensor may be provided. Furthermore, in the said embodiment, although the example which used the rod-shaped sensor as an axial load sensor was given, this invention is applicable also to the system using a loading plate type sensor as an axial load sensor.

It is a figure which shows an example of the overloaded vehicle detection system which concerns on this invention. It is a block diagram of an axial weight measurement part. It is a block diagram of a roadside control part. It is a block diagram of a high-order apparatus. It is a figure explaining the principle of overload detection. It is the flowchart which showed a series of procedures of the overloading process. It is an example of the warning display displayed on a display board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle 10a Front shaft 10b Rear shaft 10c Load 11, 21 Axle load sensor 12, 13, 22, 23 Loop coil 14, 24 Axle load measurement unit 15 Road side control unit 16 Host device 17, 27 Camera 18, 28 Display board 100 Overload Loading vehicle detection system

Claims (5)

Axle load sensor deployed on the road surface,
Measuring means for measuring the axle weight and the number of axes of the traveling vehicle based on the detection output of the axle weight sensor;
When the number of axes measured by the measuring means is two , the axle weight ratio, which is the ratio of the axle weight of the rear axle to the axle weight of the front axle of the traveling vehicle , is compared with a predetermined threshold, and the comparison A determination means for determining that the traveling vehicle is an overloaded vehicle or a vehicle suspected of being overloaded based on the result ,
The threshold value is a value in a range from the minimum axle load ratio when the weight ratio of the load to be loaded to the front axle is the maximum value to the maximum axle load ratio when the distribution ratio is the minimum value. An overloaded vehicle detection system characterized by being set . The detection system according to claim 1,
The detection system for an overloaded vehicle, wherein the threshold value is a value in a range of 1.4 to 1.9. The detection system according to claim 1,
Reading means for reading the license plate information of the traveling vehicle;
Display means for displaying a warning together with license plate information read by the reading means for a traveling vehicle determined as an overloaded vehicle by the determining means;
An overloaded vehicle detection system, further comprising: The detection system according to claim 1,
Reading means for reading the license plate information of the traveling vehicle;
Recording means for recording license plate information read by the reading means for a traveling vehicle determined as an overloaded vehicle by the determining means;
An overloaded vehicle detection system, further comprising: An overload vehicle detection method using an axle load sensor disposed on a road surface, a measurement unit that measures the axle load and the number of axes of a traveling vehicle, and a determination unit that determines whether the traveling vehicle is an overload vehicle. There,
Based on the detection output of the axle load sensor, the measuring means measures the axle weight and the number of axes of the traveling vehicle;
If the number of axes measured is biaxial, the determination means compares the axle load ratio is the ratio of the axle load of the rear shaft for axle loads front axle of the traveling vehicle and a predetermined threshold value, the Determining , based on the comparison result, the traveling vehicle as an overloaded vehicle or a vehicle suspected of being overloaded ,
The threshold value is a value in a range from the minimum axle load ratio when the weight ratio of the load to be loaded to the front axle is the maximum value to the maximum axle load ratio when the distribution ratio is the minimum value. An overloaded vehicle detection method characterized by being set .

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