JP4720205B2 - Axial load measuring device, axial load measuring system, and measuring accuracy monitoring method - Google Patents

Description

  The present invention relates to a measure for lowering the measurement accuracy of an axle load measuring device that measures a vertical force applied to a road surface by an axle of a vehicle, that is, an axle load.

  In order to obtain information on road maintenance and traffic regulation, measurement data such as the total weight of large vehicles measured by the axle load measurement device is collected by the host device, and statistical processing is performed on the collected data. . The axle load measuring device measures the vertical force (axle weight) applied to the road surface by the axle of the traveling vehicle based on the output signal of the axle load meter embedded in the running road, and adds the axle weight of each axis to obtain the total weight. Ask. There are two types of axle weights: a loading plate type and a rod type. The loading plate type axle weight meter detects the entire axle load of the traveling vehicle with a loading plate wider than the ground contact width of the tire. The axle weight meter detects the partial pressure value of the axle weight with a sensor that is narrower than the ground contact width of the tire. In a rod-type shaft weight meter, the shaft weight is calculated by integrating the partial pressure values.

  However, since the traveling vehicle vibrates due to road surface unevenness and acceleration / deceleration, the instantaneous value of the axle load fluctuates, so an accurate value can be obtained simply by measuring the axle load at one location on the road. I can't. For this reason, a measurement error may be made small by arrange | positioning a plurality of axle weight meters along a traveling path, and averaging the measured value of each axle weight meter. Furthermore, it has been proposed that three or more axle load gauges are arranged at unequal intervals, the center value of the vibration is estimated from the measurement values of each axle load gauge, and this center value is used as the axle load. (For example, Patent Document 1). In addition, the axle load after the time t1, t2,... Tn has elapsed since the traveling vehicle entered the measurement area with a plurality of axle weight meters provided in the measurement area, and a predetermined value is assigned to each measured value. It has also been proposed to obtain the axial weight in which the influence of the vibration is canceled by performing the arithmetic processing (for example, Patent Document 2). Patent Document 3 below shows a method for calculating the distance between axles with high accuracy using two axle weights. Patent Documents 4 and 5 listed below relate to sensitivity calibration of an electronic balance and correction of measurement values. Patent Document 6 below shows the appearance of a wheel crane.

  By the way, drought (including deformation of asphalt road surface due to heat) occurs on the road surface due to secular change. As shown in FIG. 10, initially, the upper surface of the axle load gauge 7 and the road surface 4a are on the same plane (FIG. 10 (a)), but the upper surface of the axle load gauge 7 is separated from the road surface 4a by the growth of the ridge 4b. It will be in the state which protruded (Drawing 10 (b)). Since the vibration of the vehicle changes due to the flange 4b, the measurement error of the axle load becomes large even if the above method is used. In other words, the measurement accuracy of the axle load measuring device decreases with the passage of time. Therefore, a test vehicle having a known axle weight is periodically run on the axle weight meter 7 as many times as necessary, and the measured value of the axle weight is compared with the known axle weight so that the measured value is within a predetermined accuracy range. It is necessary to verify whether it exists. If it is out of the accuracy range, the axle load measuring device is corrected by adjusting the amplification factor of the output signal of the axle load meter 7 so that the measurement accuracy can be obtained. If the predetermined measurement accuracy cannot be obtained even by this correction, the road surface 4a is repaired. For example, in the case where the shaft weight meter 7 is a quartz piezoelectric rod type sensor, the upper surface of the shaft weight meter 7, that is, the upper surface of an aluminum holding body surrounding the crystal that outputs a current proportional to the partial pressure of the shaft weight. And the road surface 4a is flattened (FIG. 10C).

JP 2000-121418 A (Claims 1-2, paragraphs 0026-0036) Japanese Patent No. 3350915 (Claim 1, paragraphs 0020-0051) JP 11-232586 A (summary) Japanese Patent No. 2513390 (paragraphs 0001 to 0011) Japanese Unexamined Patent Publication No. 2000-039356 (Abstract) Japanese Unexamined Patent Publication No. 2000-143160 (FIGS. 1 and 2)

  However, in the above-mentioned conventional one, it is necessary to prepare a test vehicle with a known axle load and run it as many times as necessary, which requires a lot of cost and labor, and verifies the measurement accuracy of the axle load measuring device. It is not realistic to do it frequently. For this reason, the ridge 4b may grow before the verification, and the measurement value may be out of the accuracy range. In such a case, since it is unclear when the measured value is out of the accuracy range, there is a problem that the reliability of the measured value is impaired. Axle load measuring devices are used for warnings of special vehicles in addition to the purpose of obtaining information necessary for road maintenance and traffic regulation, so it is required for axle load measuring devices that the measured values are within the accuracy range. .

The present invention solves the above-mentioned problems, and the problem is that the measurement accuracy of the axle load measuring device is out of the allowable range without running a test vehicle having a known axle load. It is to determine and notify.

The axle load measuring device according to the first aspect of the invention is an axle load measuring device that measures the axle load of a traveling vehicle based on an output signal of an axle load meter installed on a travel path, and is data that can be measured by the axle load meter. Te, a specific vehicle discrimination information for discriminating a specific vehicle is a specific running vehicle from other vehicles, a storage unit for storing a permissible range of the weight measurement value of a particular vehicle, corresponding to the specific vehicle identification information Specific vehicle determination means for determining whether or not the traveling vehicle is a specific vehicle based on the traveling vehicle information that is information and data measured by the axle load meter and the specific vehicle determination information, and a specific vehicle determination When the means determines that the traveling vehicle is a specific vehicle, the weight determination means for determining whether the weight measurement value of the traveling vehicle is within the allowable range, and the weight determination value of the traveling vehicle is: It is judged that it is out of the allowable range When, and an output means for outputting the determination result.
Here, the above-described weight measurement values are measurement values such as total weight and front axle weight. Further, the specific vehicle determination unit and the weight determination unit correspond to the arithmetic control unit shown in the embodiment, and the output unit corresponds to the communication unit and the warning light shown in the embodiment. The data that can be measured by the axle load meter or the measured data includes not only the axle weight but also at least one of the number of axes, the distance between the axes, the total weight, and the like.

  By doing so, when the weight measurement value of a specific vehicle goes out of the allowable range, that is, when the measurement accuracy of the axle load measuring device decreases due to the occurrence of wrinkles, etc. Since the content indicating that is output, the point in time when the measurement accuracy falls outside the allowable range is clarified, and this is recognized by a host device or a person (such as a road administrator) connected to the axle load measuring device. The As a result, it is possible to prevent the measured values after that point in the host device from being used as road management information. Further, it becomes possible for a person to immediately take measures according to the situation (verification of an axle load measuring device performed by running a test vehicle having a known axle load, repair of a road, etc.). Further, since it is recognized that the measurement accuracy of the axle load measuring device is outside the allowable range without running the test vehicle, it is possible to reduce the cost and labor required for monitoring the measurement accuracy.

Moreover, certain vehicle identification information is data that can be measured by the axle load meter, since the traveling vehicle information is the data measured by the axle load meters, even without separately providing other instruments, the traveling vehicle specific vehicle It can be determined whether or not. In addition, the accuracy of determination can be increased by determining the number of axes and the distance between the axes in the determination target.

  In the embodiment of the first invention, the specific vehicle discrimination information includes data on the inter-axis distance of the specific vehicle. By doing this, the traveling vehicle can be narrowed down by the distance between the axes where the measured value is hardly affected by dredging, so the measured values such as front axle weight and total weight that are affected by dredging are narrowed down under severe conditions. Even if it does not exist, it becomes possible to distinguish a specific vehicle from a running vehicle.

  Furthermore, in the embodiment of the first invention, the weight determination means determines whether or not the moving average value of the weight measurement value of the traveling vehicle information is within the allowable range. By doing in this way, the instability of the determination resulting from the measurement error of the weight measurement value can be reduced.

  Furthermore, in the embodiment of the first invention, the specific vehicle is a specific vehicle type of a self-propelled crane. This self-propelled crane does not change the total weight or the front axle weight due to cargo loading like a dump truck, so it is possible to measure axle weight by determining whether the weight measurement value of a specific vehicle is within the allowable range. It can be reliably determined that the measurement accuracy of the apparatus is out of the allowable range or has been lowered.

In the axle load measurement system according to the second aspect of the invention, an axle load measuring device that measures the axle load of the traveling vehicle based on an output signal of an axle load meter installed on the traveling road, and a measurement result transmitted by the axle load measuring device. in axle load measurement system that includes a host device for receiving the upper device is data that can be measured by the axle load meter, specific to determine the specific vehicle is a specific running vehicle from other vehicles A storage unit that stores vehicle determination information and an allowable range of a weight measurement value of a specific vehicle, a specific vehicle determination unit that determines whether or not the traveling vehicle is a specific vehicle, and a specific vehicle determination unit that identifies the traveling vehicle When it is determined that the vehicle is a vehicle, the weight determination unit that determines whether or not the weight measurement value of the traveling vehicle is within the allowable range, and the weight determination unit determines that the weight measurement value of the traveling vehicle is outside the allowable range. Is determined. And an output means for outputting a result. The axle load measuring device transmits the traveling vehicle information, which is information corresponding to the specific vehicle discriminating information and measured by the axle load meter, to the upper device, and the specified vehicle determining means of the upper device receives the information. It is determined whether the traveling vehicle is a specific vehicle based on the traveling vehicle information and the specific vehicle determination information.
Here, the above-described weight measurement values are measurement values such as total weight and front axle weight. The specific vehicle determination means and the weight determination means correspond to the arithmetic control unit of the host device shown in the embodiment, and the output means corresponds to the display unit of the host device shown in the embodiment.

  By doing so, when the weight measurement value of a specific vehicle goes out of the allowable range, that is, when the measurement accuracy of the axle load measuring device decreases due to the occurrence of wrinkles, etc. Since the content indicating the effect is output, the same effect as the first invention can be obtained.

According to a third aspect of the present invention, there is provided a method for monitoring measurement accuracy of a axle load measuring apparatus for measuring the axle load of a traveling vehicle based on an output signal of an axle load meter installed on a traveling road. In this, it is data that can be measured by the axle load meter, and is information corresponding to specific vehicle determination information for determining a specific vehicle that is a specific traveling vehicle from other traveling vehicles, and specific vehicle determination information, It is determined whether or not the traveling vehicle is a specific vehicle based on the traveling vehicle information that is data measured by the axle weight meter, and when it is determined that the traveling vehicle is the specific vehicle, the weight measurement value of the traveling vehicle Is determined to be within a predetermined allowable range of the weight measurement value of the specific vehicle, and when it is determined that the weight measurement value of the traveling vehicle is outside the allowable range, the determination result is output.
Here, the above-described weight measurement values are measurement values such as total weight and front axle weight.

  By doing so, when the weight measurement value of a specific vehicle goes out of the allowable range, that is, when the measurement accuracy of the axle load measuring device decreases due to the occurrence of wrinkles, etc. Since the content indicating the effect is output, the same effect as the first invention can be obtained.

According to the present invention, when the measurement accuracy of the axle load measuring device is determined outside the allowable range, the output contents to that effect, together with the time becomes clear, this is a human (road administrators, etc. Therefore, it is possible to prevent the measurement value of the axle load measuring apparatus whose measurement accuracy is out of the allowable range from being used as road management information or the like. Further, it becomes possible for a person to immediately take measures according to the situation (verification of an axle load measuring device performed by running a test vehicle having a known axle load, repair of a road, etc.). Furthermore, since a reduction in the measurement accuracy of the axle load measuring device is recognized without causing the test vehicle to travel, the cost and labor involved in monitoring the measurement accuracy can be reduced.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the axle load measuring device. The axle load measuring device 1 includes a loop coil 5 for detecting the entry of the vehicle 3 into the measurement region R, a loop coil 6 for detecting the exit of the vehicle 3 from the measurement region R, two loop coils 5, 6 is composed of three axle load scales 7a to 7c embedded in a measurement region R between 6 and an arithmetic control unit 2 installed on the road side. The axle weight meter 7 is not limited to three, and is preferably three or more. In the present embodiment, the description will be made in the case of using three axle weights 7. When the vehicle 3 passes over the loop coils 5 and 6 embedded in the travel path 4, the inductances of the loop coils 5 and 6 change. Based on this change, the vehicle detection unit 21 of the arithmetic control unit 2 enters the vehicle 3. And detect exit. Detection information of entry and exit of the vehicle 3 is temporarily stored in the internal memory of the arithmetic control unit 20 of the arithmetic control unit 2.

  The three axle load gauges 7a to 7c are arranged at unequal intervals so as to compensate for the fluctuation of the axle load due to the vibration of the vehicle 3 described above, and the installation interval D1 of the axle load gauges 7a and 7b is more axial. It is shorter than the installation interval D2 of the weights 7b, 7c. Hereinafter, when the axle weights 7a to 7c are not specified, they are simply expressed as the axle weight meter 7. In the present embodiment, a quartz piezoelectric bar sensor is used as the axial weight meter 7, but a loading plate type, for example, may be used. The output signal (axle weight signal) of each axle weight meter 7 is subjected to current / voltage conversion, amplification and A / D conversion by the signal conversion unit 22 of the arithmetic control unit 2, and an A / D converted digital signal. Is temporarily stored in the internal memory of the arithmetic control unit 20. Further, when each axle weight meter 7 detects the axle weight, the time is read from the timer circuit 24, and this time is also stored. The arithmetic control unit 20 uses this digital signal and the time to determine the axle weight, the total weight, the number of axles (hereinafter referred to as the number of axles), the distance between axles (hereinafter referred to as the inter-axis distance), and the like. Further, using the detection information of the entry and exit of the vehicle 3 obtained by the vehicle detection unit 21, the output signal of the axle load meter 7 and the traveling vehicle 3 are associated with each other.

  The communication unit 25 transmits measurement data (axial weight, etc.) received from the arithmetic control unit 20 to the host device 8 (for example, a host computer), and passes the data received from the host device 8 to the arithmetic control unit 20. In addition, the timer circuit 24 outputs the current time according to a request from the arithmetic control unit 20. The warning lamp 26 is turned on by a signal from the calculation control unit 20.

  In the present embodiment, the axle load measuring apparatus 1 determines whether the measured value of the total weight of a vehicle whose number of axes, total weight, etc. are known (hereinafter, this vehicle is referred to as a specific vehicle) is within a predetermined allowable range. If it is determined that it is out of the allowable range, the host device 8 is notified accordingly. First, selection of a specific vehicle will be described. For this selection, a vehicle manufacturer's catalog or the like is used. Since the specific vehicle is a vehicle used for determination of measurement accuracy, the following two conditions must be satisfied. First, it is a vehicle in which the total weight (total value of the axle weight of each axis) does not change. Accordingly, dump trucks for loading cargo are not targeted for specific vehicles, but are for self-propelled cranes. Second, since the specific vehicle is determined from the traveling vehicle 3 based on the inter-axis distance, the front axle weight, and the like, the vehicle does not have any other vehicle that approximates the inter-axis distance, the front axle weight, or the like.

  For example, since there is only one vehicle having two shafts, an inter-axis distance of 3.5 m ± 0.05 m, and a front axle weight of 10 tons or more, this vehicle type is selected as a specific vehicle here. . This vehicle type (wheel crane "Panther 250" sold by Kobelco Crane Co., Ltd.) has 2 axles, an inter-shaft distance of 3.5 m, a front axle weight of 13.25 tons, and a total weight of 26.5 tons. . The wheel crane is a self-propelled crane in which a full swing crane is mounted on a lower traveling body supported by two or three or more axles. Further, since the measurement accuracy is determined by the measured value of the total weight of the specific vehicle, it is also a condition for the specific vehicle that the number of units sold is somewhat large.

  When a specific vehicle is selected, specific vehicle determination information and specific vehicle weight information are determined and stored in advance in the storage unit 23 of the arithmetic control unit 2 as shown in FIG. The specific vehicle discrimination information is information for discriminating a specific vehicle from other vehicles. The number of axes (2), the lower limit value of the inter-axis distance (3.5 m-0.05 m), and the upper limit value of the inter-axis distance ( 3.5 m + 0.05 m), and the lower limit of the front axle load (11.93 tons = 13.25 tons × 0.9). The specific vehicle weight information is information for determining whether or not the measured value of the total weight of the specific vehicle is within a predetermined accuracy range. The lower limit value of the measured total weight (23.85 tons = 26.5 tons × 0.9), and the upper limit of the total weight (29.15 tons = 26.5 tons × 1.1).

  In this case, the allowable range of decrease in measurement accuracy is set within ± 10% in consideration of measurement error of axle load, but the measurement error is obtained from the number of axle load gauges 7 and the output signal of axle load gauge 7. Because it depends on the algorithm, ± 10% is an example of an allowable range of measurement accuracy, that is, an allowable range of measured values. Even if a measurement error of + 10% occurs in the measured value of the front axle weight of 10 tons or less, it does not exceed the lower limit value (11.93 tons) of the front axle weight of the specific vehicle. In addition, the storage of the specific vehicle determination information and the like in the storage unit 23 is performed by transmitting information input by the host device 8 to the axle load measuring device 1.

  Next, collection of axle load signals of the vehicle 3 traveling in the measurement region R will be described. First, when the entry of the vehicle 3 is detected by the loop coil 5, the collection of axle load signals of the vehicle 3 is started, and this collection is performed until the exit of the vehicle 3 is detected by the loop coil 6. The axle weight signals output from the three axle weight meters 7 are pre-processed by the signal conversion unit 22 and the calculation control unit 20, and the axle load signal after the pre-processing is calculated together with the detection time of the axle load. Saved in the internal memory. For example, when the number of axes of the traveling vehicle 3 is two, the front axle weight signal from the three axle weight gauges 7 and the rear axle weight signal from the three axle weight gauges 7 are stored in the internal memory.

  FIG. 3 is a flowchart showing processing for the axial load signal. The axle load signal for each traveling vehicle 3 stored in the internal memory of the arithmetic control unit 20 as described above is processed according to this flowchart. First, when the axle load signals for one traveling vehicle 3 are obtained (S1: YES), the arithmetic control unit 20 obtains the number of axes, the inter-axis distance, and the axle weight of each axis using the axle load signal, and further The total weight is obtained by adding the axial weight of each axis (S2). At this time, the detection time of the axial load described above is also used. The number of axes is obtained from the number of times any axle weight meter 7, for example, the axle weight gauge 7a, detects the axle weight of the vehicle 3. The axial load of each axis is obtained by, for example, averaging the measured values obtained from the three axial load signals, or as shown in Patent Document 1 above, based on the three measured values, the center value of the vibration waveform of the axial load. Obtain by estimation.

The distance between the axes is obtained by a method similar to that disclosed in Patent Document 3 above, for example. With reference to FIG. 4, the method for obtaining the inter-axis distance will be described. The axle load measuring device 1 obtains the distance between the axes using output signals (axle weight signals) of the axle weight meters 7a and 7b. In the figure, D1 is an installation interval between axle weights 7a and 7b, L is an inter-axis distance between a front wheel 3a (front axle) and a rear wheel 3b (rear axle) of the traveling vehicle 3, and T1 is an axle weight gauge 7a on the front wheel 3a. T2 is the time from detection by the axle load gauge 7b, T2 is the time from when the rear wheel 3b is detected by the axle load gauge 7a until it is detected by the axle load gauge 7b, and T3 is the axle load gauge 7a The time from when the front wheel 3a is detected until the rear wheel 3b is detected, T4 is the time from when the front wheel 3a is detected by the axle load balance 7b until the rear wheel 3b is detected. And the distance L between axes | shafts is calculated | required by following formula (1).
L = (D1 · T3 / T1 + D1 · T4 / T2) / 2 (1)
In FIG. 4, although the inter-axis distance L is longer than the installation distance D1 of the axle weights 7a and 7b, the inter-axis distance L is obtained by the equation (1) even when the inter-axis distance L is shorter than the installation distance D1. Can do. For the vehicle 3 having three or more axes, the distance between the axes, that is, a plurality of inter-axis distances is obtained in the same manner.

  Returning to the description of FIG. Next, the arithmetic control unit 20 determines whether or not the traveling vehicle 3 is a specific vehicle (S3). This determination is performed by comparing the specific vehicle determination information (FIG. 2) with the number of axes obtained in the above step S2, and the traveling vehicle 3 is the specific vehicle when the following three conditions are satisfied. It is determined that there is. First, the number of axes of the traveling vehicle 3 matches the number of axes of the specific vehicle determination information. Second, the distance between the axes of the traveling vehicle 3 (measured value of the distance between the axes) is not less than the lower limit value and not more than the upper limit value of the inter-axis distance of the specific vehicle determination information. Third, the front axle weight (measured value of front axle weight) of the traveling vehicle 3 is equal to or greater than the lower limit value of the front axle weight of the specific vehicle determination information.

  When it is determined by the determination (S3) that the traveling vehicle 3 is a specific vehicle (S3: YES), the arithmetic control unit 20 determines that the traveling vehicle 3 (here, the traveling vehicle 3 is a specific vehicle). After storing the total weight (measured value of total weight) in the storage unit 23, the average value of the most recent predetermined number (for example, five) of total weight stored in the storage unit 23, that is, the moving average value of the total weight Is calculated (S4). Next, the arithmetic control unit 20 determines whether or not the calculated moving average value of the total weight is within an allowable range (S5). This determination is performed based on whether or not the moving average value is included in a range defined by the lower limit value and the upper limit value of the total weight of the specific vehicle weight information (FIG. 2). The use of the moving average value for this determination is not an essential matter of the present invention, but the use of the moving average value reduces the instability of the determination due to the measurement error of the axle load.

  When it is determined that the moving average value is not within the allowable range (S5: NO), that is, when the measurement accuracy of the axle load measuring device 1 is outside the allowable range, the arithmetic control unit 20 lights the warning lamp 26. Further, a message indicating that the measured value of the axle load measuring device 1 is outside the allowable range, that is, a message indicating the determination result is transmitted from the communication unit 25 to the host device 8 (S7). The warning lamp 26 remains lit until a predetermined reset operation is performed. Generally, since the axle load measuring device 1 is not always monitored by a person, this lighting state is confirmed at the time of maintenance and inspection. On the other hand, the host device 8 that has received the message displays a message such as “The measured value of the axle weight measuring device at 300 m east of the national highway No. 171 XX is out of the allowable range” on a display unit (not shown). Further, instead of transmitting the message, the moving average value and the specific vehicle weight information (the lower limit value and the upper limit value of the total weight) are transmitted to the host device 8 to determine whether or not the moving average value is outside the allowable range. The host device 8 may make the determination.

  After transmitting the message, the arithmetic control unit 20 determines the number of axes, the distance between the axes, the axial weight of each axis, and the total weight of the traveling vehicle 3 (here, the traveling vehicle 3 is a specific vehicle) obtained in step S2. Data (measured value) is transmitted to the host device 8 (S8), and thereafter, it waits for the axial load signals of the next traveling vehicle 3 to be aligned (S1). At this point in time, it is known that the measurement accuracy is outside the allowable range, so that the data is handled as reference information in the host device 8.

  On the other hand, if it is determined in step S3 that the traveling vehicle 3 is not a specific vehicle (S3: NO), and if it is determined in step S5 that the moving average value is within the allowable range (S5: YES), the calculation is performed. The control unit 20 transmits the data (measured values) of the number of axes of the traveling vehicle 3, the distance between the axes, the axial weight and the total weight of each axis obtained in step S <b> 2 to the host device 8 (S <b> 8). Wait until the axle load signals of the traveling vehicle 3 are aligned (S1). The data is stored in the host device 8 and used as road management information. Incidentally, after the measurement accuracy once falls outside the allowable range (S5: NO), these data are handled as reference information in the host device 8.

  As described above, when the measured value of the total weight of the specific vehicle (specifically, the moving average value of the measured value) is out of the allowable range, that is, the measurement accuracy of the axle load measuring device 1 due to the occurrence of wrinkles, etc. When the value falls outside the allowable range, a message indicating that the measured value of the axle load measuring device 1 is out of the allowable range is transmitted to the host device 8. Based on this message, the host device 8 also displays a message having the same content, so that the person (road manager or the like) is informed that the measurement accuracy is out of the allowable range. As a result, the point in time when the measurement accuracy of the axle load measuring device 1 falls outside the allowable range is clarified, and measurement data after that point can be prevented from being used as road management information. Then, it becomes possible for the road administrator or the like to immediately verify the axle load measuring device 1 and repair the road performed by running the above-described test vehicle. In addition, since one of the specific vehicle determination information is the distance between the shafts that is hardly affected by the wrinkle, the traveling vehicle 3 does not need to determine the measured values such as the front axle weight and the total weight that are affected by the wrinkle under severe conditions. The specific vehicle can be discriminated from.

  In the embodiment described above, the determination as to whether or not the traveling vehicle 3 is a specific vehicle is performed using the number of axes, the distance between the axes and the front axle weight, but the determination is made using other data. It may be. For example, instead of the front axle weight, the axle weight or the total weight of the second axis from the head may be used, or the total weight and a plurality of inter-axis distances may be used. May be used.

  In the above embodiment, the axle load measuring device 1 determines whether or not the traveling vehicle 3 is a specific vehicle and whether or not the moving average value is within an allowable range. May be. In this case, the axle load measuring device 1 executes only steps S1, S2, and S8 in FIG. 3, and executes processing corresponding to steps S3 to S6 using data such as the number of axes received by the host device 8. In this case, “lights the warning light” in S6 is “displays a message on the display unit of the host device that the measured value of the axle weight measuring device on the national highway 171 OO intersection east 300 is outside the allowable range”, for example. It becomes. Furthermore, in the said embodiment, although one specific vehicle was used, multiple specific vehicles may be sufficient.

  Next, a second embodiment of the present invention will be described. In this embodiment, it is determined whether the traveling vehicle 3 is a specific vehicle using the image data of a specific vehicle. Therefore, the vehicle has shape characteristics and the shape does not change due to cargo loading, such as a self-propelled crane characterized by the positional relationship and size relationship between the crane section and the driver's seat section, and the shape of the crane section. A self-propelled crane or the like is selected as a specific vehicle.

  FIG. 5 shows the configuration of the axial load measuring apparatus of the present embodiment. However, the internal configuration of the arithmetic control unit 2 and the host device 8 are not shown. This axle load measuring device 1a is the same as the axle load measuring device 1 of FIG. 1 except that it includes a camera 9 that is an imaging means for taking an image of the traveling vehicle 3, but in the storage unit 23 of the arithmetic control unit 2. The image data of the specific vehicle (hereinafter also referred to as image data for determination) is stored in advance as specific vehicle determination information instead of the above-described number of axes (FIG. 2). Also, the axle load signal processing is the same as in FIG. 3 except that the method for determining a specific vehicle (step S3 in FIG. 3) is different. The camera 9 is installed at a position of about 6 m above the ground so that shooting of the vehicle 3 to be shot is not hindered by a vehicle traveling in the front. For example, the upstream loop coil 5 causes the vehicle 3 to move at a predetermined timing. The front part of the traveling vehicle 3 is photographed when detected. The camera 9 is connected to the arithmetic control unit 20 (FIG. 1) of the arithmetic control unit 2, images the traveling vehicle 3 in accordance with a signal from the arithmetic control unit 20, and sends the captured image data to the arithmetic control unit 20. .

  Then, the arithmetic control unit 20 compares the image data of the traveling vehicle 3 with the above-described image data for determination, that is, by applying pattern matching processing to the two image data, the traveling vehicle 3 becomes the specific vehicle. Is determined (processing corresponding to step S3 in FIG. 3). Here, the image data for determination is obtained by photographing a specific vehicle at a production factory, or obtained by photographing a specific vehicle at the same position as the position where the traveling vehicle 3 is photographed. When the latter is used, the determination accuracy by the pattern matching process is higher than when the former is used. Further, the image data for determination is not limited to the image of the entire front surface of the specific vehicle, and may be an image of only the characteristic portion.

  Also in the present embodiment, when the moving average value of the measured value of the total weight of the specific vehicle is out of the allowable range, that is, due to the occurrence of wrinkles, the measurement accuracy of the axle load measuring device 1a is reduced and out of the allowable range. Since the message indicating that the measured value is out of the allowable range is transmitted to the upper device 8 at the time, the same effect as in the previous embodiment can be obtained. Further, since the specific vehicle is determined from the traveling vehicle 3 using the image data without using the measured value such as the total weight, the specific vehicle is determined from the traveling vehicle regardless of the change in the measurement accuracy of the axle load measuring device 1a. it can.

  In the present embodiment described above, the traveling vehicle 3 is photographed by one camera 9, but a second camera is installed at a position different from the camera 9, and the first camera 9 and the second camera are used. You may make it image | photograph the traveling vehicle 3 by a stereo system. In this case, the arithmetic control unit 20 obtains the size of the traveling vehicle 3 (for example, the vehicle width and the width of the characteristic portion at a predetermined height position) from the difference between the two image data generated by the parallax between the two cameras. The storage unit 23 stores in advance an upper limit value and a lower limit value of the size of the specific vehicle as specific vehicle determination information. Then, in addition to the determination by the pattern matching process, the arithmetic control unit 20 determines whether or not the size of the traveling vehicle 3 obtained from the captured image data is included in the range defined by the upper limit value and the lower limit value. Judgment based on is also performed. Thereby, the accuracy of determination can be improved.

  Further, in this embodiment, the camera 9 is installed further downstream than the loop coil 6 on the downstream side, and the front surface of the traveling vehicle 3 is photographed. However, the camera is located on the side of the loop coil 5 on the upstream side. It may be installed, and when the loop coil 5 detects the vehicle 3 or when the axle load meter 7a located at the most upstream detects the axle load, the side surface portion of the traveling vehicle 3 may be photographed. In this case, the image data for determination is image data obtained by photographing the side portion of the specific vehicle. Furthermore, in this embodiment, the paint colors and patterns of the specific vehicle were not mentioned, but the paint colors and patterns are common to most of the specific vehicles, and there are no other models of similar colors and patterns. If it is known, pattern matching processing may be performed including colors and patterns. If it does in this way, the accuracy of judgment of whether traveling vehicle 3 is a specific vehicle can be raised.

  Next, a third embodiment of the present invention will be described. FIG. 6 shows an axle load measuring system including an axle load measuring device and a host device. In the present embodiment, the host device 8a accumulates measurement data such as the total weight transmitted by the axle load measuring device 1b, and determines a decrease in measurement accuracy of the axle load measuring device 1b based on the accumulated measurement data. The host device 8a includes a communication unit 82 that receives measurement data from the axle load measuring device 1b, a storage unit 81 such as a hard disk that stores the received measurement data, a display unit 83 such as a liquid crystal display, and an operation unit such as a keyboard. 84 and a calculation control unit 80 for controlling and calculating each unit. The host device 8a is the same as that shown in FIG. 1 in hardware, but the processing executed by the arithmetic control unit 80 is different. The axle load measuring device 1b is the same as that shown in FIG. 1 in hardware, but the arithmetic control unit 20 does not execute steps S3 to S7 in FIG. 3 (only S1, S2, and S8 are executed). ) Is different from that shown in FIG.

  The measurement data transmitted by the axle load measuring device 1b installed in each place is received by the communication unit 82, and sequentially written and accumulated in a transaction file for each axle load measuring device 1b of the accumulation unit 81. As described above, the measurement data includes the number of axes, the distance between the axes, the axial weight of each axis, and the total weight. When a predetermined operation is performed on the operation unit 84 or when a certain period of time elapses, the arithmetic control unit 80 performs information processing on the transaction file and writes information necessary for road management in the output file, and also outputs the output file. Is displayed on the display unit 83 in a format that is easy for a person (such as a road manager) to understand. As output files created for each axle load measuring device 1b, there are a traveling number file by total weight and a traveling number file by maximum axle weight.

  FIG. 7A and FIG. 7B show the contents of the total number of traveling vehicles by weight file. This file is actually created from a transaction file in which measurement data for approximately 2.5 months of the axle load measuring device 1b installed at a certain point is accumulated. The total weight category and vehicle type (T1.1) Etc.) indicates the number of vehicles traveling. Here, the total weight exceeds 20 tons, and the total weight exceeding 60 tons is omitted because the number of running vehicles is small. “T” of type Tm.n indicates that the traveling vehicle 3 is a single vehicle in which the driver's seat and the loading platform are integrated, and “m” is the number of axes of the driver's seat (number of axles), “n”. Is the number of axes of the loading platform. "S" of type Sp.q-r represents a trailer vehicle in which a traveling unit and a trailer are rotatably connected, "p" is the number of axes on the front side of the traveling unit, and "q" is a rear part of the traveling unit. The number of axes on the side, “r”, is the number of trailer axes. These types are identified based on the number of axes measured and the distance between the axes. “Others” includes those having 7 or more axes, and “total number” is the total number of traveling vehicles of all types (including “others”).

  From FIG. 7A and FIG. 7B, in type T1.1, the total weight is 28.1 to 29.0 tons, and there is a peak of the number of vehicles (97 vehicles), and in “total number”, the total weight is 35.1 to 36. It can be seen that there is a peak (1608 units) in the 0.0-ton class. Further, it is known from the past results of analyzing the accumulated data that the peak position of the number of traveling vehicles, that is, the total weight category where the peak exists does not change if the axle load measuring device 1b is periodically verified. Therefore, when the peak position fluctuates beyond a predetermined amount, the measurement accuracy of the axle load measuring device 1b is lowered. In addition, since the number of axes is 3 or more except for the type T1.1, it is easy to determine whether or not the traveling vehicle 3 is the type T1.1.

  FIG. 8 shows the contents of the maximum number-of-travel-by-axis traveling number file. This file is created based on the same measurement data as the total number of running vehicles by total weight, and indicates the number of running vehicles for each maximum axle classification and vehicle type. The maximum axle weight is the maximum axle weight among a plurality of axle weights. Here, the case where the maximum axle weight exceeds 10 tons is targeted, and those having the maximum axle weight exceeding 30 tons are omitted because the number of traveling vehicles is small. From FIG. 8, in type T1.1, there is a peak in the number of traveling vehicles (53 units) in the section with the maximum axle weight of 20.1 to 21.0 tons, and the number of traveling units in the section of 13.1 to 14.0 tons. It can be seen that there are (65 units). The reason why the number of traveling vehicles is smaller than that in FIGS. 7A and 7B is that a vehicle having a total weight of more than 20 tons has a high ratio of three or more axles.

  Next, a method for determining a decrease in measurement accuracy of the axle load measuring device 1b from a change in the peak position of the number of traveling vehicles will be described. Here, the measurement accuracy is reduced based on the fluctuation of the total weight category (35.1 to 36.0 tons) in which the peak of the number of traveled vehicles (1608) in the “total number of vehicles” file by total weight exists. A determination method will be described. Although it is possible to make a determination based on the fluctuation of the peak in the type T1.1, the reliability of the determination is increased by adopting the peak in the “total number” that is large in number. In addition, since significant measurement data can be accumulated in a short period of time, it is possible to detect a decrease in measurement accuracy early (with a short cycle).

  FIG. 9 shows the flow of processing in this embodiment. Since it is a condition that the measurement accuracy of the axle load measuring device 1b is sufficient in order to accumulate the correct data of the total number of traveling units by total weight, first, a person (such as a road administrator) verifies the axle load measuring device 1b. Perform (S11). This verification is performed by running a test vehicle having a known weight as described above, and the running path 4 is repaired as necessary. After the verification is completed, the calculation control unit 80 accumulates the measurement data received from the axle load measuring device 1b in the accumulation unit 81 for a certain period (for example, for 2.5 months) (S12). This certain period is called a first certain period. Here, only the total weight of the measurement data is necessary, but in order to obtain road management information, the number of axes, the distance between the axes, and the axial weight of each axis are also accumulated.

  After the first fixed period has elapsed, the calculation control unit 80 creates the above-mentioned traveling number by weight total file from the measurement data accumulated during the period (S13). In FIGS. 7A and 7B, the width of the total weight category is 1 ton. However, by increasing or decreasing the category width, the number of traveling vehicles and the peak value of the number of traveling vehicles change. Decide and create the optimal number of vehicles by total weight. The arithmetic control unit 80 repeatedly creates a file while changing the section width on a trial basis, and determines the section width at which the optimum file is created. In this case, the division width may be determined by a collaborative work between the host device 8a and a person (such as a road manager). Here, it is assumed that the total number of travel number files shown in FIGS. 7A and 7B are optimal files.

  Next, based on the content of the total number of traveling units by weight file, the calculation control unit 80 determines the total weight category (hereinafter referred to as the first total weight category) where the peak number of traveling units exists (S14). Since the peak is determined by the relative relationship between the number of vehicles traveling in the first gross weight category and the number of vehicles traveling in the preceding and following gross weight categories, the range of the preceding and following gross weight categories (this is called the peak search range) is also determined. . In FIG. 7A, if the section of 35.1 to 36.0 tons is the first total weight section, for example, the range of 32.1 to 39.0 tons is the peak search range. Although the number of peaks is one here, the same processing is performed even when there are a plurality of peaks.

  Further, the calculation control unit 80 accumulates the measurement data received from the axle load measuring device 1b in the accumulation unit 81 for a certain period (for example, one month) (S15). This certain period is called the second certain period. Then, a total number of traveling number file is created from the accumulated measurement data (S16). This file is created based on the same total weight classification as the total weight-based traveling number file created in step S13. Next, the calculation control unit 80 determines the total weight category (hereinafter referred to as the second total weight category) in which the peak of the number of running vehicles exists within the above-described peak search range based on the contents of the created total number of running vehicles by total weight file. Determine (S17). And when this 2nd gross weight division and said 1st gross weight division are the same (S18: YES), it judges that the measuring system of axle load measuring device 1b has not fallen, and is a calculation control part. 80 again accumulates new measurement data in the accumulating unit 81 (S15). This step S18 is repeatedly executed, but the lengths of the first and second fixed periods for accumulating the measurement data are determined so that no soot grows when the step 18 is first executed. Yes.

  On the other hand, when the first gross weight category and the second gross weight category are different (S18: NO), the calculation control unit 80 displays a message indicating that the measurement accuracy of the axle load measuring device 1b is reduced. 83 (S19). A road manager or the like who sees this message determines whether or not the verification of the axle load measuring device 1b is necessary by checking the contents of a series of total number of running vehicles by total weight from the past to the present, etc. ( S20). When it is determined that the verification is unnecessary (S20: NO), the arithmetic control unit 80 stores new measurement data in the storage unit 81 again when detecting that a predetermined operation is performed on the operation unit 84 (S15). ). When it is determined that the verification is necessary (S20: YES), the road administrator or the like verifies the axle load measuring device 1b as described above (S21). After the verification is completed, when the arithmetic control unit 80 detects that a predetermined operation has been performed by the operation unit 84, it stores new measurement data in the storage unit 81 again (S12).

  As described above, the calculation control unit 80 checks whether or not the total weight classification in which the peak of the traveling number distribution is present has changed every certain period, and the measurement accuracy of the axle load measuring device 1b is reduced, so that the total When the weight classification changes, a message to that effect is displayed on the display unit 83. In this way, a decrease in measurement accuracy is notified to a person (such as a road manager), and the point in time when the measurement accuracy decreases is clarified. Then, a road administrator or the like can immediately take appropriate measures (for example, verification of the axle load measuring device 1b or repair of the road) by confirming the history of the traveling number file by total weight.

  In the present embodiment described above, when the first total weight section and the second total weight section are different from each other, it is determined that the measurement accuracy of the axle load measuring device 1b is lowered. However, depending on the width of the total weight category, the peak of the number of traveling vehicles may be steep or gradual. In addition, the number of traveling vehicles in each total weight category is often located at the center of the category, or is often located at the end. Therefore, when the first total weight category and the second total weight category differ by a predetermined number (for example, two) or more according to the situation, it may be determined that the measurement accuracy is lowered. In the present embodiment, the decrease in measurement accuracy is determined based on the accumulated total weight measurement data. However, the decrease in measurement accuracy is determined based on the measurement data such as the maximum axle weight and the front axle weight. May be.

  Further, in the present embodiment, a first total number-of-travel-units-by-weight file is created from the measurement data (step S12 in FIG. 9) accumulated during the first fixed period (2.5 months) (step S13). 2nd, 3rd,... Traveled vehicle files by total weight are created from the measurement data (step S15) accumulated during the 2nd, 3rd,. (Step S16). Instead, the second fixed period is set as a half-month, and a second traveling number file by total weight is created from the measurement data accumulated in the half-month and the second period after the first fixed period, You may make it produce the 3rd traveling number file according to total weight from the measurement data accumulate | stored in the 2nd and 3rd period.

  Further, in the present embodiment, the decrease in the measurement accuracy is determined based on whether or not the total weight category where the peak of the number of running vehicles has changed, but when the change amount of the total weight category and the measurement accuracy can be associated with each other It is also possible to determine whether or not the measurement accuracy is within an allowable range based on the amount of change. Furthermore, in the present embodiment, a decrease in measurement accuracy is determined based on whether or not the total weight category in which the peak of the traveling number distribution is present has changed. However, when the traveling number distribution has a valley, there is a valley. A decrease in measurement accuracy can also be determined based on whether the total weight category has changed.

It is a figure which shows the structure of the axial load measuring apparatus in 1st Embodiment. It is a figure which shows specific vehicle discrimination information and specific vehicle weight information. It is a flowchart which shows the process with respect to an axial load signal. It is a figure for demonstrating how to obtain | require the distance between axes | shafts. It is a figure which shows the structure of the axial load measuring apparatus in 2nd Embodiment. It is a figure which shows the axial load measuring system in 3rd Embodiment. It is a figure which shows the content of the traveling number file according to total weight. It is a figure which shows the content of the traveling number file according to total weight. It is a figure which shows the content of the traveling number file according to the maximum axle weight. It is a figure which shows the flow of the process in 3rd Embodiment. It is a figure which shows generation | occurrence | production of a dredging, and road surface repair.

Explanation of symbols

1, 1a, 1b Axle load measuring device 3 Vehicle (traveling vehicle)
4 Traveling path 5, 6 Loop coil 7, 7a-7c Axle weight 8, 8a Host device 9 Camera (imaging means)
20 Arithmetic control unit (calculation control unit of axle load measuring device)
23 storage unit 25 communication unit (output means of axle load measuring device)
26 Warning light (output means of axle load measuring device)
80 Arithmetic control unit (calculation control unit of host device)
81 storage unit 83 display unit (output means of host device)
R Measurement area

Claims (6)

In the axle weight measuring device that measures the axle weight of the traveling vehicle based on the output signal of the axle weight meter installed in the travel path,
Data that can be measured by the axle weight meter, storing specific vehicle determination information for determining a specific vehicle that is a specific traveling vehicle from other traveling vehicles, and an allowable range of a weight measurement value of the specific vehicle A storage unit;
It is information corresponding to the specific vehicle determination information, and it is determined whether or not the traveling vehicle is a specific vehicle based on the traveling vehicle information that is data measured by the axle load meter and the specific vehicle determination information Specific vehicle determination means to perform,
A weight determination unit that determines whether or not a weight measurement value of the traveling vehicle is within the allowable range when the specific vehicle determination unit determines that the traveling vehicle is a specific vehicle;
An axle load measuring apparatus comprising: an output unit that outputs a determination result when the weight determination unit determines that the weight measurement value of the traveling vehicle is outside the allowable range. In the axial load measuring apparatus according to claim 1 ,
The specific vehicle determination information includes data on an inter-axis distance of a specific vehicle. In the axial load measuring device according to claim 1 or 2 ,
The axle weight measuring device, wherein the weight judging means judges whether or not a moving average value of weight measured values of the traveling vehicle information is within the allowable range. In the axial load measuring device according to any one of claims 1 to 3 ,
The specific vehicle is a specific vehicle type of a self-propelled crane. Axle weight measurement comprising an axle weight measuring device that measures the axle weight of a traveling vehicle based on an output signal of an axle weight meter installed on the road and a host device that receives the measurement results transmitted by the axle weight measuring device. In the system,
The host device is
Data that can be measured by the axle weight meter, storing specific vehicle determination information for determining a specific vehicle that is a specific traveling vehicle from other traveling vehicles, and an allowable range of a weight measurement value of the specific vehicle A storage unit;
Specific vehicle determination means for determining whether or not the traveling vehicle is a specific vehicle;
A weight determination unit that determines whether or not a weight measurement value of the traveling vehicle is within the allowable range when the specific vehicle determination unit determines that the traveling vehicle is a specific vehicle;
Output means for outputting the determination result when the weight determination means determines that the weight measurement value of the traveling vehicle is outside the allowable range;
The axle load measuring device is information corresponding to the specific vehicle discrimination information, and transmits traveling vehicle information that is data measured by the axle load meter to the host device,
The specific vehicle determination unit determines whether or not the traveling vehicle is a specific vehicle based on the received traveling vehicle information and the specific vehicle determination information. In the monitoring method of the measurement accuracy of the axle load measuring device that measures the axle weight of the traveling vehicle based on the output signal of the axle load meter installed on the travel path,
A data that can be measured by the axle load meters, and the specific vehicle discrimination information for discriminating a specific vehicle is a specific running vehicle from other vehicles, is information corresponding to a particular vehicle identification information, the It is determined whether or not the traveling vehicle is a specific vehicle based on traveling vehicle information that is data measured by the axle load meter ,
When it is determined that the traveling vehicle is a specific vehicle, it is determined whether the weight measurement value of the traveling vehicle is within a predetermined allowable range of the weight measurement value of the specific vehicle;
When it is determined that the weight measurement value of the traveling vehicle is outside the allowable range, the determination result is output.

Images