JP2011064462A - Axle load measuring instrument, and system and method for confirming measurement accuracy of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a traveling test for confirming the measurement accuracy of an axle load measuring instrument, without performing road regulation, and easily obtain a history of the measurement accuracy. <P>SOLUTION: In the measuring instrument body 5 of the axle load measuring instrument 20A, the license plate number, a known axle load, and a known total weight of a test vehicle are stored beforehand as known data, and a tolerance for the error of an axle load and a tolerance for the error of a total weight are stored beforehand as determining data to be used for determining the measurement accuracy. The test vehicle is identified by photographing the license plates of travelling vehicles with an imaging camera 4 and reading the numbers of the vehicles. Concerning the identified test vehicle, the errors of an axle load and a total weight measured based on load sensors S1-S3, from the known axle load and the known total weight are calculated respectively, and the measurement accuracy is determined depending on whether the errors are within their tolerances. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an axle weight measuring device that measures the axle weight of a vehicle (a vertical force exerted on a road surface by an axle of the vehicle) using a load sensor, and a system for confirming measurement accuracy of the axle weight measuring device, and Regarding the method.

  The axle weight measuring device is generally used to determine whether or not the axle weight of a vehicle such as a truck exceeds the axle weight specified in the vehicle restriction ordinance (see, for example, Patent Document 1). The axle load measuring device measures the axle load of a vehicle by, for example, installing the load sensor embedded in a road in front of a toll booth on a general road or a toll road, and passing the vehicle over the load sensor. Is configured to do.

  In such an axle load measuring device, after completion of the installation work on the road, for example, a weight is placed on a truck, and a test vehicle in which the axle weight of each axle is measured in advance on a truck scale is connected to a load sensor. A test for confirming the measurement accuracy (performance), that is, a so-called travel test, is performed by measuring the axle load by running on the installed road.

  In this running test, the known axle load value of the test vehicle is used as a reference value, and the difference between this reference value and the axle load value of the test vehicle measured by a load sensor installed on the road is taken as an error. Check if it is within range.

  The running test in this case is to run the test vehicle at different speeds as many times as necessary on the road where the load sensor is embedded, measure the axle load for each speed, and the above error is within the allowable range for each measurement. Check if it is within.

  These running tests are performed not only at the time of installation of the axle load measuring device, but also periodically thereafter, for example, every six months or every year, and in each case, it is confirmed whether or not the above error is within an allowable range. To do.

  When the error is not within the allowable range, the axle load measuring device is readjusted or the road is repaired depending on the cause.

JP 2005-127951 A

  Since the axle load measuring device is installed in front of the toll gate entrance on ordinary roads and toll roads, in order to measure multiple times for each speed, only the test vehicle is run and the roads that restrict the passage of ordinary vehicles Although it is necessary to implement regulations, road regulations are undesirable from the environmental and safety aspects because they hinder traffic flow and cause traffic congestion.

  Therefore, if the driving test is performed without performing such road regulation, the test vehicle will be driven in the same manner as a general vehicle. For example, on a highway, the test vehicle does not interfere with the general vehicle. As you can see, it is necessary to go to the toll booth where the driving test is performed, for example, enter the general road from the next toll booth, and return to the toll gate where the driving test is performed again. There is a problem that a lot of time and labor are required.

  In addition, since the running test is performed periodically as described above, for example, every six months or every year, even if the measurement accuracy of the axle load measuring device decreases during that time, the time when it has decreased There is also a problem that the history of measurement accuracy cannot be grasped.

  Furthermore, in the running test, the measured axle load value is recorded on a predetermined sheet of paper or input to a personal computer or the like, so that personnel are required for that purpose and labor costs increase. There is also.

  The present invention has been made in view of the above-described problems, and is capable of performing a running test for confirming the measurement accuracy of the axle load measuring device without restricting the road, and measuring the history of measurement accuracy. The main purpose is to make it easy to grasp.

  (1) The axle load measuring apparatus according to the first aspect of the present invention for achieving the above object measures the axle load of a vehicle based on the output of a load sensor installed on the traveling path of the vehicle and determines the measurement accuracy. An identification means for identifying a test vehicle having a known axle weight among vehicles traveling on the traveling road, known data including the known axle weight of the test vehicle, and Storage means for storing determination data used for determination of measurement accuracy, measurement data including axle load measured based on the output of the load sensor for the test vehicle identified by the identification means, and the storage means Determination means for determining measurement accuracy based on the known data and the determination data of the test vehicle.

  The test vehicle may be a single vehicle or a plurality of vehicles, and the storage unit preferably stores the known data and the determination data in association with each test vehicle.

  The determination unit may include an output unit that displays, prints, or outputs a sound of the determination result, and the output unit outputs not only the determination result but also measurement data, known data, and the like. You may be able to do it.

  According to the first axle load measuring device of the present invention, the identification means identifies a test vehicle having a known axle load value from among the vehicles traveling on the road, and includes the axle load measured for the identified test vehicle. Based on the measurement data, the known data including the known axle load of the test vehicle stored in the storage means, and the determination data used for the determination of the measurement accuracy, the determination means determines the measurement accuracy of the axle load measuring device. Since it did in this way, a test vehicle can drive | work the same travel route as a general vehicle, and the determination of the measurement precision of an axle load measuring apparatus, ie, a traveling test, can be implemented.

  In addition, the test vehicle is equipped with a axle load measuring device, for example, it is possible to perform a running test simply by patrol the toll gate on the highway. There is no need to enter the general road and return to the toll booth where the original driving test is being performed, and moreover, the driving test is not performed every six months or every year as in the past, but in a shorter time. This can be performed irregularly at intervals, and the history of measurement accuracy of the axle load measuring device can be easily grasped.

  In addition, since measurement accuracy is determined using measurement data including the axle weight measured for the test vehicle, the work of writing the measured axle weight on a predetermined sheet or inputting it to a personal computer or the like is required. As a result, the cost required for the running test can be reduced as compared with the prior art.

  In the first aspect of the present invention, in a preferred embodiment, the storage means stores a vehicle number of the test vehicle in association with the known data and the determination data, and the identification means stores the travel path. An image pickup means for picking up a license plate of a traveling vehicle, and a vehicle number reading means for reading a vehicle number based on an image signal of the image pickup means, wherein the vehicle number read by the vehicle number read means is stored in the memory The test vehicle is identified based on whether it is included in the vehicle number of the test vehicle stored in the means.

  According to this embodiment, based on the vehicle number imaged by the imaging means, it is possible to identify a test vehicle having a known axle weight from among the vehicles traveling on the traveling road.

  In the first aspect of the present invention, in another preferred embodiment, the known data includes a known axle weight and a known gross vehicle weight of the test vehicle, and the measurement data is based on an output of the load sensor. It includes the axle weight and total weight of the test vehicle to be measured, and the determination data includes an allowable range of an axle weight error that is an error between the known axle weight and the axle weight of the measurement, and the known vehicle. A tolerance of a total vehicle weight error that is an error between the total weight and the total vehicle weight of the measurement, and the determination means determines that an error between the known axle load and the measurement axle weight is an error of the axle load error. The measurement accuracy is determined based on whether it is within an allowable range and whether an error between the known total vehicle weight and the measured total vehicle weight is within an allowable range of the total vehicle weight error. Judgment.

  According to this embodiment, the error between the measured axle weight of the test vehicle and the known axle weight, and the error between the measured gross weight and the known gross weight are each within an allowable range. Accuracy can be determined.

  In still another preferred embodiment, a transmission unit that transmits a determination result by the determination unit to a higher-level device may be provided.

  According to this embodiment, the host device can manage the measurement accuracy of each axle load measuring device by collecting the determination results from each axle load measuring device installed at each of a plurality of points.

  (2) A measurement accuracy confirmation system for an axle load measuring device according to a second aspect of the present invention includes an axle load measuring device that measures an axle load of a vehicle based on an output of a load sensor installed on a travel path of the vehicle, and the shaft A host device that receives data transmitted by the weight measuring device and confirms the measurement accuracy of the axle weight measuring device, wherein the axle weight measuring device is configured to An identification unit for identifying a test vehicle having a known weight, and a transmission for transmitting, to the host device, measurement data including an axial weight measured based on an output of the load sensor for the test vehicle identified by the identification unit Means for storing the known data including the known axle load of the test vehicle and data for determination used for determination of measurement accuracy, and the storage device from the axle load measuring device. Measurement data Receiving means for receiving, it said received measurement data, on the basis of the known data and the determination data of the test vehicle to be stored in the storage means, and a determination means for determining measurement accuracy.

  According to the measurement accuracy confirmation system of the second axle load measuring device of the present invention, the axle load measuring device identifies a test vehicle having a known axle load from among the vehicles traveling on the traveling road, and identifies the identified test vehicle. Measurement data including the measured axle weight is transmitted to the host device, and the host device determines the axis based on the received measurement data, known data including the known axle weight of the test vehicle, and determination data used for determination of measurement accuracy. Since the measurement accuracy of the heavy measuring device is determined, the running test can be carried out by running the test vehicle on the same running path as the general vehicle.

  Moreover, the test vehicle is equipped with a axle load measuring device, for example, it is possible to perform a running test simply by going around a toll gate on an expressway. In addition, it is not performed every six months or every year, but irregularly at shorter time intervals, and the measurement accuracy history of the axle load measuring device can be easily grasped.

  Further, it is not necessary to write the axle weight measured for the test vehicle on a predetermined sheet or to input and record it on a personal computer or the like, so that the cost required for the running test can be reduced.

  (3) A measurement accuracy confirmation system for an axle load measuring device according to a third aspect of the present invention includes an axle load measuring device that measures an axle load of a vehicle based on an output of a load sensor installed on a traveling path of the vehicle, and the shaft A host device that receives data transmitted by the weight measuring device and confirms the measurement accuracy of the axle weight measuring device, wherein the axle weight measuring device is configured to Identification means for identifying a test vehicle having a known weight, storage means for storing known data including the known axle weight of the test vehicle and determination data used for determination of measurement accuracy, and identification by the identification means For the test vehicle, the measurement accuracy is determined based on the measurement data including the axle load measured based on the output of the load sensor, the known data of the test vehicle stored in the storage means, and the determination data. A determination unit; and a transmission unit that transmits a determination result by the determination unit to the higher-level device, wherein the higher-level device includes a reception unit that receives the determination result and an output unit that outputs the received determination result. I have.

  The axle load measuring device may transmit measurement data other than the determination result, known data, etc. to the host device, and the host device outputs measurement data other than the determination result, known data, etc. by the output means. May be.

  According to the measurement accuracy confirmation system of the third axle load measuring device of the present invention, the axle load measuring device identifies a test vehicle having a known axle load from the vehicles traveling on the road and measures the identified test vehicle. Based on the measurement data including the measured axle load, the known data including the known axle load of the test vehicle, and the determination data used for determining the measurement accuracy, the measurement accuracy of the axle load measuring device is determined and transmitted to the host device, Since the host device can collect the determination results of the measurement accuracy of the axle load measuring device installed at each point, it is possible to perform a running test by running the test vehicle on the same traveling path as a general vehicle. .

  Moreover, the test vehicle is equipped with a axle load measuring device, for example, it is possible to perform a running test simply by going around a toll gate on an expressway. In addition, it is not performed every six months or every year, but irregularly at shorter time intervals, and the measurement accuracy history of the axle load measuring device can be easily grasped.

  Further, it is not necessary to write the axial weight measured for the test vehicle on a predetermined sheet or to input and record it on a personal computer or the like, so that the cost required for the running test can be reduced.

  As a third alternative embodiment of the present invention, the axle load measuring device includes a receiving means for receiving data from the host device, and rewriting for rewriting the storage contents of the storage means based on the data received by the receiving means. And the host device may further include a transmission unit that transmits data to be stored in the storage unit of the axle load measuring device to the axle load measuring device.

  The data is preferably a vehicle number or identification number of a test vehicle, known data corresponding to the test vehicle, or determination data.

  According to this embodiment, by transmitting data from the host device to the axle load measuring device, the axle load measuring device can receive the data and rewrite the contents of the storage means, For example, it is possible to easily change the test vehicle and the determination criteria for the measurement accuracy.

  (4) The method for confirming the measurement accuracy of the axle load measuring device according to the fourth aspect of the present invention provides the measurement accuracy of the axle load measuring device for measuring the axle load of the vehicle based on the output of the load sensor installed on the traveling path of the vehicle. An identification method for identifying test data for identifying a test vehicle having a known axle load, known data including a known axle load of the test vehicle, and determination data used for determination of measurement accuracy. A storage step; an identification step for identifying the test vehicle using the identification data among the vehicles traveling on the travel path; a measurement step for measuring the axle load of the test vehicle; and A determination step for determining measurement accuracy based on measurement data including axle load, the known data of the test vehicle, and determination data.

  According to the measurement accuracy confirmation method of the fourth axle load measuring device of the present invention, a test vehicle having a known axle load is identified from among vehicles traveling on the road using identification data such as a vehicle number, and is identified. The measurement accuracy of the axle load measuring device is determined based on the measurement data including the axle load value measured for the tested vehicle, the known data including the known axle load value of the test vehicle, and the determination data used for determining the measurement accuracy. Since it did in this way, a test test can be made to drive | work a test vehicle on the same traveling path as a general vehicle.

  Moreover, the test vehicle is equipped with a axle load measuring device, for example, it is possible to perform a running test simply by going around a toll gate on an expressway. In addition, it is not performed every six months or every year, but irregularly at shorter time intervals, and the measurement accuracy history of the axle load measuring device can be easily grasped.

  Further, it is not necessary to write the axial weight measured for the test vehicle on a predetermined sheet or to input and record it on a personal computer or the like, so that the cost required for the running test can be reduced.

  According to the present invention, a test vehicle having a known axle weight is identified from among vehicles traveling on a traveling road, measurement data including the axle weight measured for the identified test vehicle, and a known axle weight of the test vehicle are included. Since the measurement accuracy of the axle load measuring device is determined based on the known data and the determination data used for determining the measurement accuracy, the test test is performed by running the test vehicle on the same traveling path as the general vehicle. Can do.

  In addition, the test vehicle is equipped with a axle load measuring device, for example, it is possible to perform a running test simply by going around a toll gate on the highway, and it is performed every six months or every year as in the past. Instead, it can be performed irregularly at shorter time intervals, and the measurement accuracy history of the axle load measuring device can be easily grasped.

FIG. 1 is a diagram schematically showing a configuration example of a measurement accuracy confirmation system of an axle load measuring apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of a main part of the measurement apparatus main body of FIG. FIG. 3 is a block diagram of the host device of FIG. FIG. 4 is a diagram showing a table stored in the storage unit of FIG. FIG. 5 is a diagram showing a table stored in the host device of FIG. FIG. 6 is a flowchart for explaining the operation. FIG. 7 is a diagram schematically showing a configuration example of a measurement accuracy confirmation system of the axial load measuring apparatus according to another embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 schematically shows a configuration example of the axle load measuring apparatus according to the embodiment. Referring to FIG. 1, this axle load measuring device 20 </ b> A is an axle load measuring device installed at a toll gate entrance at point A among a plurality of points A to Z described later on a toll road. The axle load measuring device installed at the toll gate entrance at another point has the same configuration.

  The axle load measuring device 20A installed at the point A includes three load sensors S1 to S3 installed on the travel path 2 on which the vehicle 1 travels, and the light projecting / receiving devices 3a and 3b, and detects the vehicle 1. Based on the outputs of the vehicle detector 3, the imaging camera 4 as an imaging means for imaging the license plate of the vehicle 1, the load sensors S <b> 1 to S <b> 3, the vehicle detector 3, and the imaging camera 4, And a measuring device main body 5 for checking the measurement accuracy and transmitting the measurement and confirmation results to the host device 6 of the management center.

  As shown in FIG. 3 to be described later, in the upper management device 6 of this management center, data of the measurement accuracy confirmation results from the respective axle load measuring devices 20A to 20Z respectively installed at a plurality of points A to Z on the toll road. Are collected.

  The load sensors S <b> 1 to S <b> 3 shown in FIG. 1 are arranged in this order along the traveling direction of the vehicle 1 indicated by an arrow 16, and are embedded in the travel path 2. The concrete illustration of the embedded state in each traveling path 2 of each of the load sensors S1 to S3 is omitted. The load sensor S1 positioned on the upstream side in the traveling direction of the vehicle 1 is a loading plate whose vehicle traveling direction sensor width is equal to or greater than the ground contact length of each tire connected to each axis of the vehicle, and the downstream load sensor. S2 and S3 are weight bar sensors in which the vehicle traveling direction sensor width is smaller than the ground contact length of each tire connected to each axis of the vehicle. These load sensors S1 to S3 include a plurality of load cells, and these load cells are configured to output a load signal corresponding to the load.

  The three load sensors S1 to S3 are arranged in this way when the vehicle 1 vibrates due to unevenness of the road surface of the traveling road 2 or acceleration or deceleration of the vehicle 1 and the axial load value fluctuates instantaneously. In addition, for example, the average of the output values of each of the load sensors S1 to S3 is to suppress the measurement error, but of course, the configuration such as the number and arrangement of the load sensors is limited to this embodiment. Rather, it is optional.

  The vehicle detector 3 detects the entry and exit of the vehicle 1 from the measurement area in order to separate the vehicle whose axle load is to be measured. In this embodiment, the vehicle detector 3 is composed of a photoelectric sensor having a projector 3a and a light receiver 3b as an example, and the period during which the vehicle 1 is shielded from light passing between the projectors 3a and 3b is as follows: The detection output is turned on, otherwise it is turned off. Of course, the vehicle detector 3 is not limited to the photoelectric sensor, and may be another sensor such as an ultrasonic method or a loop coil method.

  In response to the vehicle detector 3 entering the measurement area of the vehicle 1, the measurement device body 5 measures the axial weight and the total vehicle weight of each axis of the vehicle 1 based on the outputs of the load sensors S <b> 1 to S <b> 3. At the same time, the traveling speed of the vehicle 1 is measured.

  In this embodiment, it is configured as follows so that a running test performed to confirm the measurement accuracy at the time of and after the installation of the axle load measuring device 20A can be performed without implementing road regulation. .

  In the running test, for example, a weight is placed on a truck and a test vehicle in which the axle weight of each axle and the total vehicle weight are measured in advance on a truck scale is run. In this embodiment, a test vehicle is used. The axle load is measured by traveling in the same manner as a general vehicle.

  In other words, a plurality of test vehicles travel around the toll gates at a plurality of points A to Z on the toll road mixed with ordinary vehicles. When passing through each toll gate at each of the points A to Z, the vehicle travels at a traveling speed different from the traveling speed at the previous passage. It is also possible to travel a plurality of times at the same travel speed and measure the axle load at the same travel speed.

  As will be described later, the vehicle number of each of the plurality of test vehicles, each known axle weight and each known total weight of each test vehicle are previously stored in the measuring device body 5 as known data, and measurement accuracy is determined. The allowable range of the axle load error rate and the allowable range of the total weight error rate corresponding to the travel speed range to be used are stored in advance as determination data.

  The measuring device body 5 reads the vehicle number of the vehicle 1 imaged by the imaging camera 4 and identifies the test vehicle by whether or not the read vehicle number is included in the vehicle numbers of a plurality of test vehicles stored in advance. When the vehicle is a test vehicle, based on the axial weight and total vehicle weight of each axis measured for the test vehicle, and the axial weight and total vehicle weight of each axis of the test vehicle as known data stored in advance. The error rate of the axle load and the total vehicle weight is calculated respectively, and compared with the allowable range of the error rate to determine whether the measurement accuracy is good or not, and the determination result is transmitted to the host device 6 of the management center. ing.

  FIG. 2 is a block diagram of the main part showing the configuration of the measurement apparatus main body 5 of FIG. 1, and parts corresponding to those in FIG.

  The measuring device main body 5 includes a vehicle number reading unit 7 that reads a vehicle number from an imaging signal from an imaging camera 4 that images a license plate of the vehicle, a vehicle number reading unit 7, load sensors S1 to S3, and a vehicle detector 3. An arithmetic control unit 8 to which an output is given, a storage unit 9, a communication unit 10 communicating with the host device 6 of the management center, a display 17, and a time measuring unit 18 for measuring time are provided.

  The calculation control unit 8 is an A / D conversion unit that converts an analog load signal output from the load sensors S1 to S3 into a digital load signal as a determination unit that calculates and determines the measurement accuracy, and this A / D conversion unit. A CPU for executing various arithmetic processes based on the output is provided.

  The storage unit 9 stores a program memory in which various programs for axle load measurement and a running test are stored, a work memory used for various operations such as calculation, known data and determination data about the test vehicle, and a running test. A table memory for storing the result data is provided.

  As shown in FIG. 3, the host device 6 of the management center is connected to each of the axle load measuring devices 20 </ b> A to 20 </ b> Z installed at each of a plurality of points A to Z by, for example, a LAN (local area network) 15. Then, data of a running test result by the test vehicle passing through each of the points A to Z is collected.

  The host device 6 includes a server main body 11 including a computer, a display 12, a printer 13, and an HDD (hard disk drive) 14 as servers.

  In the table memory of the storage unit 9 of the measuring device main body 5 shown in FIG. 2, as shown in FIG. 4, data necessary for the running test, specifically, the number of a plurality of test vehicles, each test vehicle As the “known data”, the axle weight of each axis, the total vehicle weight, and the “determination data” used for the determination of the measurement accuracy are the axial weight and the total vehicle weight in each travel speed range (in FIG. The table of the allowable range of the error rate is stored.

  According to this table, for example, in the test vehicle having the vehicle number “Kobe 100 is 12-34”, “t” is used as a ton, the axle weight of the first axis is 5.42 (t), and the axle weight of the second axis is 7 .45 (t), the axial weight of the third axis is 6.12 (t), and the total vehicle weight is 18.99 (t). The axle load error rate tolerance range and the vehicle gross weight error rate tolerance range in this vehicle are ± 3% and ± 2% when the running speed is 10 km / h or less, respectively, and the running speed is 10 km / h to 20 km. / 5 for ± 5% and ± 3%, for travel speeds of 20 km / h to 30 km / h, ± 5% and ± 3%, for 30 km / h to 40 km / h, ± 5% and ± 3% 3%, when the traveling speed is 40 km / h to 50 km / h, they are ± 10% and ± 5%, and when the traveling speed exceeds 50 km / h, they are ± 20% and ± 10%. Similarly, for each vehicle number of the test vehicle, the axle weight of each axle, the total vehicle weight, and the error rate allowable range are tabulated.

  Note that the error rate, for example, the error rate of axle load, is obtained by dividing the difference (error) obtained by subtracting the reference value from the measured axle load value by using the axle load value of this table as the reference value. It is a value multiplied by 100.

  The table memory also stores driving test result data, and the test result data is transmitted to the host device 6 of the management sensor. Therefore, the host device 6 collects data of the running test results of the axle load measuring devices 20A to 20Z at the points A to Z.

  FIG. 5 shows a running test by a test vehicle that is transmitted from each of the axle load measuring devices 20A to 20D at four points A to D representatively among a plurality of points A to Z collected by the host device 6. The resulting data is shown. The axle load measuring devices 20A to 20D at the respective points A to D, the axle load measuring device 20A being “lane 1”, the axle load measuring device 20B being “lane 2”, the axle load measuring device 20C being “lane 1”, the axle load. The measuring device 20D measures the axle load in each of the “lane 1”, and “date and time”, “vehicle number”, “item”, “first axis”, “second axis”, “third axis”, respectively. , “Fourth axis”, and “total vehicle weight”, and “items” are items of measurement axle weight (t), measurement speed (km / h), axle load error rate, allowable error rate, and weight determination. is there.

  For example, the case of transmission data from the axle load measuring device 20A at the point “A” will be described. In this transmission data, “1” is displayed in the “lane” column, and “May 5, 2009” is displayed in the “date and time” column. “10:57:47 am of the day” is “Kobe 100 is 12-34” in the “vehicle number” column, and the corresponding test vehicle has passed.

  Then, regarding the test vehicle that has passed over the load sensors S1 to S3 of the axle load measuring device 20A at the point “A”, the “measurement axle weight” of the “first axis” is 5.57 (t), and the “measurement speed” is 41 (km / h), “Axial load error rate” is 2.8 (%), “Allowable error rate” is ± 10 (%), “Weight judgment” is “Good”, “Second axis” “Measurement axle load” is 7.14 (t), “Measurement speed” is 41 (km / h), “Axle load error rate” is −4.2 (%), and “Allowable error rate” is ± 10 (% ), “Weight determination” is “Good”, “Measurement axle weight” of “3rd axis” is 5.98 (t), “Measurement speed” is 42 (km / h), “Axle weight error rate” Is -2.3 (%), the “allowable error rate” is ± 10 (%), the “weight judgment” is “good”, the “total vehicle weight” is 18.69 (t), and the “measurement speed” is 41 (km / h), “Weight error rate” is −1.6 (%), “Allowable error rate” Is higher than ± 5 (%) and the “weight determination” is “good”.

  Next, the operation will be described with reference to FIGS. 1 to 3 and FIGS. 6 (a) and 6 (b). FIG. 6A is a flowchart for explaining the operation of the axle load measuring device 20A, and FIG. 6B is a flowchart for explaining the operation of the host device 6 of the management center.

 With reference to FIG. 6A, first, in the arithmetic control unit 8 in the axle load measuring device 20A, whether or not the vehicle 1 has entered the vehicle detection area is detected by the vehicle detection signal from the vehicle detector 3. Is determined (step n1). When the arithmetic control unit 8 determines that the vehicle 1 has been detected by turning on the vehicle detection 3 from the vehicle detector 3, the arithmetic control unit 8 performs image processing on the imaging signal from the imaging camera 4 and reads the vehicle number (step n2).

  Next, when the axial load of each axis of the vehicle 1 is detected by the load sensors S1 to S3, the arithmetic control unit 8 processes the load signal from each of the load sensors S1 to S3 to obtain the axial load value of each axis. Each is calculated (step n3).

  As this calculation method, for example, three axial weight values respectively measured by the load sensors S1 to S3 are averaged and calculated as a final axial weight value.

  The calculation control unit 8 determines whether or not the vehicle is no longer detected by the vehicle detector 3, that is, whether or not the vehicle has left the measurement area (step n4). When the calculation control unit 8 determines that the vehicle detection from the vehicle detector 3 is OFF and the vehicle has left, the calculation control unit 8 calculates the total weight of the vehicle by adding the axle weights corresponding to the number of axles (step n5). ) And the travel speed is calculated based on the timing at which the load sensors S1 to S3 detect each axis (step n6).

  This travel speed calculation process is performed based on, for example, the difference between the time when the load sensor S1 detects the axle load and the time when the load sensor S2 detects the axle load and the known distance between the load sensors S1 and S2. Similarly, based on the difference between the time when the load sensor S2 detects the axial weight and the time when the load sensor S3 detects the axial weight and the known distance between the load sensors S2 and S3. The second calculation processing is performed for the traveling speed. The two traveling speeds obtained by the first and second calculation processes are averaged to calculate the final traveling speed.

  Next, the arithmetic control unit 8 determines whether or not the vehicle number read in step n2 is included in the vehicle number of the test vehicle stored in advance (step n7), and determines that it is not included. If so, the flowchart ends.

  When the arithmetic control unit 8 determines that the vehicle number read in step n7 is included in the vehicle number of the test vehicle stored in advance, the axle weight, the total vehicle weight and the vehicle weight measured in steps n3 and n5 While calculating the error rate based on the axle weight and total vehicle weight of the test vehicle stored in advance shown in FIG. 4 above, whether or not the error rate is within the allowable range of the error rate, That is, the quality of the measurement accuracy is determined (step n8), and the information is transmitted to the host device 6 (step n9).

  On the other hand, in the host device 6, as shown in the flowchart of FIG. 6B, the server body 11 receives the data of the running test results from the respective axle load measuring devices at the respective points A to Z (step n11). The received data is stored in a recording medium such as a hard disk by controlling the HDD 14 (step n12), and the running test result data shown in FIG. 5 is displayed on the screen of the display 12 (step n13). In response, printing is performed by the printer 13, an alarm is displayed at a point where the pass / fail judgment result is "No" (step n14), and an alarm sound is output if necessary.

  As described above, in the present embodiment, the vehicle number of each vehicle 2 on the travel path 1 is imaged to identify the test vehicle having a known axle load and the like, while based on the outputs of the load sensors S1 to S3. Since the axle weight of the test vehicle is measured, the error rate is calculated from the known axle weight and the measured axle weight, and it is determined whether the error rate is within the allowable range. A traveling test of the axle load measuring device can be performed by traveling on the same traveling path as a general vehicle.

  Furthermore, the test vehicle can perform a running test only by going around a toll gate on an expressway, for example, where an axle load measuring device is installed. As a result, there is no need to travel to the toll gate where the driving test is performed, enter the general road from the next toll gate, and return to the toll gate where the original driving test is performed again. However, it is not performed every six months or every year as in the past, but can be performed irregularly at shorter time intervals, and the history of measurement accuracy of the axle load measuring device can be easily grasped.

 Also, during the running test, the measured axle load was written on a predetermined sheet or input operation for recording on a personal computer or the like, but measurement data and determination results are collected by the host device 6. This eliminates the need for personnel to record the measurement data, thereby reducing the cost required for the running test.

  It should be noted that the contents of the table memory of the storage unit 9 of the measuring device main body 5, for example, the number of the test vehicle shown in FIG. 4 above, the axial weight of each axis for each test vehicle, the total vehicle weight, or the measurement accuracy Data such as an allowable error rate range used for determination can be rewritten from the host device 6. That is, by transmitting data from the host device 6 to the measurement device main body 5, the arithmetic control unit 8 of the measurement device main body 5 rewrites the contents of the table memory of the storage unit 9 based on the received data.

 According to this, it is possible to easily change the content of the running test, for example, the test vehicle and the determination criteria for the measurement accuracy. In particular, it is effective for changing data of the respective axle load measuring devices 20A to 20Z respectively installed at a plurality of points A to Z all at once.

 Next, with reference to FIG. 7, an axle load measuring device according to another embodiment of the present invention will be described. FIG. 7 is a diagram schematically illustrating a configuration example of the axle load measuring device, and corresponds to FIG. 1 described above.

  In the above-described embodiment, the license plate of the vehicle 1 is imaged and the test vehicle is identified by the vehicle number. However, in the axle load measuring device 20A-1 of the embodiment shown in FIG. The vehicle-mounted device 21 that wirelessly transmits the vehicle identification number is mounted, and the identification number transmitted from the vehicle-mounted device 21 when the vehicle-mounted device 21 enters the predetermined distance range is received on the road side of the traveling path 2. The identification number received by the receiver 22 is provided to the measurement apparatus main body 5-1. In the embodiment shown in FIG. 7, the test vehicle is identified by an identification number wirelessly transmitted from the vehicle-mounted device 21 instead of the vehicle number. Other configurations are the same as those of the above-described embodiment.

  In each of the above-described embodiments, the measurement accuracy is determined on the axle load measuring devices 20A and 20a-1, but this is not a limitation. For example, on the axle load measuring device side, the test vehicle is identified. Then, the measurement data including the axle load value measured for the identified test vehicle is transmitted to the host device 6, and the host device 6 side includes the received measurement data of the test vehicle and the known axle load value of the test vehicle stored in advance. The measurement accuracy may be determined based on the known data and determination data indicating an allowable range of error.

The present invention is useful for a running test for confirming the measurement accuracy of the axle load measuring device.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Traveling path 3 Vehicle detector 4 Imaging camera 5 Measuring apparatus main body 6 High-order apparatus 9 Memory | storage part

Claims (6)

Based on the output of a load sensor installed on the traveling path of the vehicle, the axle load measuring device is capable of measuring the axle load of the vehicle and determining the measurement accuracy,
Identification means for identifying a test vehicle having a known axle load from among the vehicles traveling on the travel path;
Storage means for storing known data including the known axle load of the test vehicle and determination data used for determination of measurement accuracy;
Based on the measurement data including the axle load measured based on the output of the load sensor with respect to the test vehicle identified by the identification means, the known data and the determination data of the test vehicle stored in the storage means Determining means for determining measurement accuracy;
A shaft weight measuring device comprising: The storage means stores a vehicle number of the test vehicle in association with the known data and the determination data,
The identification means includes imaging means for imaging a license plate of a vehicle traveling on the road, and vehicle number reading means for reading a vehicle number based on an imaging signal of the imaging means,
The axle load measurement according to claim 1, wherein the test vehicle is identified based on whether the vehicle number read by the vehicle number reading means is included in a vehicle number of the test vehicle stored in the storage means. apparatus. The known data includes a known axle weight and a known gross vehicle weight of the test vehicle;
The measurement data includes the axial weight and the total weight of the test vehicle measured based on the output of the load sensor,
The determination data is an allowable range of an axle load error that is an error between the known axle load and the measured axle load, and a vehicle that is an error between the known vehicle gross weight and the measured vehicle gross weight. Including tolerance of gross weight error,
The determination means determines whether an error between the known axle weight and the measured axle weight is within an allowable range of the axle load error, and the known vehicle total weight and the measured vehicle total weight. The axle load measuring device according to claim 1, wherein the measurement accuracy is determined based on whether or not the error is within an allowable range of the total vehicle weight error. An axle load measuring device that measures the axle load of a vehicle based on an output of a load sensor installed on a travel path of the vehicle, and a host device that receives data transmitted by the axle load measuring device, the axle load measurement A system for checking the measurement accuracy of a device,
The axle load measuring device is
Identification means for identifying a test vehicle having a known axle load from among the vehicles traveling on the travel path, and the axle load measured based on the output of the load sensor for the test vehicle identified by the identification means. Transmission means for transmitting the measurement data including to the host device,
The host device is
Storage means for storing known data including the known axle load of the test vehicle and determination data used for determination of measurement accuracy, receiving means for receiving the measurement data from the axle load measuring device, and Determination means for determining measurement accuracy based on the measurement data, the known data of the test vehicle stored in the storage means, and the determination data;
A measuring accuracy confirmation system for a shaft weight measuring apparatus characterized by An axle load measuring device that measures the axle load of a vehicle based on an output of a load sensor installed on a travel path of the vehicle, and a host device that receives data transmitted by the axle load measuring device, the axle load measurement A system for checking the measurement accuracy of a device,
The axle load measuring device is
An identification means for identifying a test vehicle having a known axle weight among vehicles traveling on the traveling road, known data including the known axle weight of the test vehicle, and determination data used for determination of measurement accuracy are stored. Measuring data including axial load measured based on the output of the load sensor, the known data of the test vehicle stored in the storage means, and the determination for the test vehicle identified by the identification means A determination unit that determines measurement accuracy based on data; and a transmission unit that transmits a determination result by the determination unit to the host device.
The host device is
A receiving unit that receives the determination result; and an output unit that outputs the received determination result.
A measuring accuracy confirmation system for a shaft weight measuring apparatus characterized by A method for confirming the measurement accuracy of an axle load measuring device that measures the axle weight of a vehicle based on an output of a load sensor installed on a traveling path of the vehicle,
A storage step of storing identification data for identifying a test vehicle having a known axle load, known data including a known axle load of the test vehicle, and determination data used for determination of measurement accuracy;
An identification step of identifying the test vehicle using the identification data from among the vehicles traveling on the travel path;
A measuring step for measuring the axle load of the test vehicle;
A determination step of determining measurement accuracy based on measurement data including the measured axle weight of the test vehicle, the known data of the test vehicle, and determination data;
A method for confirming the measurement accuracy of the axle load measuring apparatus characterized by comprising:

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