JP7031571B2 - Axial load measuring device, measurement accuracy diagnosis method, and measurement accuracy diagnosis program - Google Patents

Description

The present invention relates to a technique for diagnosing whether or not the measurement accuracy of an axle load sensor that measures an axle load of a traveling vehicle is appropriate.

Conventionally, there has been a device for measuring the weight of a vehicle traveling on a road. This device processes the measurement signals of a plurality of (two or more) axle load sensors embedded in the road in the traveling direction of the vehicle to measure the weight of the traveling vehicle (see Patent Document 1 and the like). As is known, the axle load sensor is a sensor used for measuring the normal force (axle load) when a wheel attached to the axle of a vehicle passes through each axle of the vehicle.

The axle load of the axle is calculated by processing the measurement signals of a plurality of axle load sensors embedded side by side in the traveling direction of the vehicle. For example, for each axle, the average value of the axle load measured by a plurality of axle load sensors for that axle is calculated as the axle load of the axle. Further, the weight of the vehicle is the total sum (total) of the axle loads calculated for each axle of the vehicle.

Further, Patent Document 1 describes a configuration (a configuration for updating the correction coefficient) in which sensitivity is corrected according to the measurement accuracy of the axle load for each axle load sensor without interrupting the measurement of the weight of the vehicle. ing. Specifically, for each axle load sensor, the weight of the vehicle calculated using the measurement data when a predetermined specific vehicle (vehicle whose vehicle data such as the number of axles and total weight is known) passes is true. The correction coefficient that corrects the sensitivity is updated so that it becomes a value.

Japanese Unexamined Patent Publication No. 2010-261825

However, the specific vehicle in Patent Document 1 is
(1) The vehicle must have a total weight (total axle load of each axle) that does not change depending on usage conditions.
(2) The vehicle must have no other vehicle with similar number of axes, distance between axes, axle load, etc.
It must be a vehicle that satisfies the conditions of.

Therefore, a vehicle loaded with cargo, such as a truck or a trailer, does not satisfy the condition (1) above. Further, general passenger cars (for private use and for company use) do not satisfy the above condition (2). For this reason, the specific vehicle had to be a special vehicle rather than a general vehicle. In Patent Document 1, a self-propelled crane is used as a specific vehicle.

If the specific vehicle is a special vehicle, the period from the current travel of the specific vehicle to the next travel of the specific vehicle may be long. In the technique according to Patent Document 1, the period for determining the decrease in the measurement accuracy of the axle load sensor is the period from the running of the specific vehicle this time to the running of the next specific vehicle. Therefore, in the technique according to Patent Document 1, it may not be possible to determine whether or not the measurement accuracy of the axle load sensor has deteriorated over a long period of time.

An object of the present invention is to provide a technique capable of determining whether or not the measurement accuracy of axle load sensors arranged side by side in the traveling direction of a special vehicle is appropriate regardless of whether or not a special vehicle is traveling.

The axle load measuring device of the present invention is configured as shown below in order to achieve the above object.

A plurality of axle load sensors are arranged side by side in the traveling direction of the vehicle. The axle weight sensor may be a single sensor that measures the axle weight of the vehicle, or a pair of sensors (a pair of wheel weight sensors) that measure the wheel weight for each wheel of the vehicle in the vehicle width direction (vehicle). They may be arranged in a direction orthogonal to the traveling direction).

The measurement signal of the axle load sensor is input to the axle load sensor connection portion. The measured value collecting unit collects measured values according to the input measurement signal for each axle load sensor. The totaling unit acquires the totaling result of totaling the collected measured values for each axle load sensor. The difference amount calculation unit calculates the difference amount of the aggregation result between the two axle load sensors. The determination unit determines whether the measurement accuracy of the axle load sensor is appropriate depending on whether the difference amount is within the appropriate range.

Even if the plurality of axle load sensors arranged side by side in the traveling direction of the vehicle have the same measurement accuracy, the measured values of the axle load are not always the same because the traveling vehicle is vibrating. That is, even if the measurement accuracy of the axle load sensor is appropriate, the measured value of the axle load may be close to the true value, relatively small with respect to the true value, or the true value. It may be a relatively large value. However, statistically speaking, if the measurement accuracy of the axle weight sensor is appropriate, if the axle weight is measured for a certain number of axles (thousands to tens of thousands), the true value of the axle weights of these axles The average value of is close to the average value of the measured values of the axle weights of these axles.

From this, the total (total) of the measured values of the axle weights measured for these axles as the aggregated result of the measured values of the axle weights measured for a certain number of axles by the totaling unit for each axle weight sensor. If you obtain the average value of the measured values of the axle weights measured for these axles, the root mean square of the measured values of the axle weights measured for these axles, etc., the aggregated results will be obtained between the axle weight sensors for which the measurement accuracy is appropriate. It will be about the same value. Therefore, it is possible to determine whether or not the measurement accuracy of these axle load sensors is appropriate based on the amount of difference in the aggregated results between the axle load sensors. Therefore, it is possible to determine whether or not the measurement accuracy of the axle load sensors arranged side by side in the traveling direction of the vehicle is appropriate regardless of whether or not the special vehicle is traveling.

In addition, three or more axle load sensors are arranged side by side in the traveling direction of the vehicle, the difference amount calculation unit calculates the difference amount of the aggregation result for each combination of the two axle load sensors, and the judgment unit has an appropriate range of the difference amount. If there is a combination of the two axle load sensors that are not inside, it may be configured to determine that there is the axle load sensor whose measurement accuracy is not appropriate.

Further, in this case, a combination of two axle load sensors whose difference amount is not within the appropriate range is extracted, and if one axle load sensor is common in all the extracted combinations, this common axle is used. It may be determined that the measurement accuracy of the heavy sensor is not appropriate. That is, with this configuration, it is possible to identify the axle load sensor whose measurement accuracy is not appropriate.

Further, the totaling unit may be configured to include an appropriate range setting unit for setting an appropriate range based on the totaling result of totaling the measured values for each axle load sensor. With this configuration, the magnitude (setting range) of the difference in the aggregated results used to determine whether the measurement accuracy of the axle load sensor is appropriate can be determined according to the aggregated results, so that the axle load can be determined. It is possible to improve the accuracy of determining whether the measurement accuracy of the sensor is appropriate.

According to the present invention, it is possible to determine whether or not the measurement accuracy of the axle load sensors arranged side by side in the traveling direction of the vehicle is appropriate regardless of whether or not the special vehicle is traveling.

It is a schematic diagram which shows the vehicle weight measuring system to which the axle load measuring apparatus which concerns on this example is applied. It is a block diagram which shows the structure of the main part of the axle load measuring apparatus which concerns on this example. 3 (A) to 3 (C) are diagrams showing the measurement data of the axle load sensor. It is a figure which shows the calculated data. It is a flowchart which shows the measurement process of the axle load measuring apparatus which concerns on this example. It is a flowchart which shows the measurement accuracy diagnosis processing of the axle load measuring apparatus which concerns on this example. It is a block diagram which shows the structure of the main part of the axle load measuring apparatus which concerns on another example.

Hereinafter, the axle load measuring device according to the embodiment of the present invention will be described.

<1. Application example>
FIG. 1 is a schematic view showing a vehicle weight measuring system to which the axle load measuring device according to this example is applied. The vehicle weight measuring system shown in FIG. 1 includes an axle load measuring device 1, three axle load sensors 2 to 4, and two vehicle detection sensors 6 and 7. The axle load sensors 2 to 4 and the vehicle detection sensors 6 and 7 are connected to the axle load measuring device 1.

As shown in FIG. 1, the vehicle detection sensor 6, the shaft weight sensor 2, the shaft weight sensor 3, the shaft weight sensor 4, and the vehicle detection sensor 7 are arranged (buried) on the road in this order in the traveling direction of the vehicle 100. Has been done. The measurement section for measuring the axle load of the vehicle 100 is a section from the vehicle detection sensor 6 to the vehicle detection sensor 7. The vehicle detection sensor 6 detects the vehicle 100 entering the measurement section. The vehicle detection sensor 7 detects the vehicle 100 leaving the measurement section.

The axle load sensor 2 is a pair of wheel load sensors 2R and 2L arranged in the vehicle width direction of a vehicle 100 traveling on a road. Similarly, the shaft weight sensor 3 is a pair of wheel weight sensors 3R and 3L arranged in the vehicle width direction of the vehicle 100 traveling on the road, and the shaft weight sensor 4 is a pair of wheel weight sensors 4R and 4L. Are arranged in the vehicle width direction of the vehicle 100 traveling on the road. The wheel load sensors 2R to 4R are embedded at positions where the right wheel of the vehicle 100 passes. Further, the wheel load sensors 2L to 4L are embedded at positions where the left wheel of the vehicle 100 passes. The wheel load sensors 2R to 4R and 2L to 4L are, for example, piezoelectric sensors, and output a measurement signal according to the pressing force when the wheel passes through to the axle load measuring device 1. The vehicle detection sensors 6 and 7 are, for example, loop coil sensors, and output a change in inductance as a vehicle detection signal (a signal indicating the presence or absence of the vehicle 100) to the axial weight measuring device 1.

The vehicle detection sensors 6 and 7 may be optical sensors or radio wave sensors that are not embedded in the road.

The wheel load sensors 2R to 4R output a measurement signal for measuring the wheel load of the right wheel to the axle load measuring device 1 for each axle of the vehicle 100 traveling in the measurement section. Further, the wheel load sensors 2L to 4L output a measurement signal for measuring the wheel load of the left wheel to the axle load measuring device 1 for each axle of the vehicle 100 traveling in the measurement section. That is, the axle weight measuring device 1 includes a measurement signal by the wheel weight sensor 2R, a measurement signal by the wheel weight sensor 3R, and a wheel weight sensor for the wheel weight of the right wheel for each axle of the vehicle 100 traveling in the measurement section. The measurement signal by 4R is input. Further, the axle weight measuring device 1 includes a measurement signal by the wheel weight sensor 2L, a measurement signal by the wheel weight sensor 3L, and a wheel weight sensor for the wheel weight of the left wheel for each axle of the vehicle 100 traveling in the measurement section. The measurement signal by 4L is input.

The distance L1 between the axle load sensor 2 and the axle load sensor 3 and the distance L2 between the axle load sensor 3 and the axle load sensor 4 in the traveling direction of the vehicle 100 are different lengths. The traveling vehicle 100 vibrates due to various factors such as unevenness of the road surface, speed, and tire pressure. When both the distance L1 between the adjacent axle load sensor 2 and the axle load sensor 3 and the distance L2 between the adjacent axle load sensor 3 and the axle load sensor 4 are close to an integral multiple of the vibration wavelength of the vehicle 100, the vehicle 100 Weight measurement error may increase. Therefore, in this example, one of the distance L1 between the adjacent axle load sensor 2 and the axle load sensor 3 or the distance L2 between the adjacent axle load sensor 3 and the axle load sensor 4 is an integral multiple of the vibration wavelength of the vehicle 100. The distance L1 and the distance L2 have different lengths so that the other does not approximate an integral multiple of the vibration wavelength of the vehicle 100.

The axle load measuring device 1 of this example accumulates and stores the measured values corresponding to the input measurement signals for each of the wheel load sensors 2R to 4R and 2L to 4L. In this example, this measured value will be described as a wheel load calculated using the input measurement signal. However, this measured value may be any value as long as it is a value corresponding to the input measurement signal. For example, this measured value may be a digital value of the input measurement signal.

Since the traveling vehicle 100 is vibrating, even if the axle load sensors 2 to 4 have substantially the same measurement accuracy, the axle load measurements measured for the same axle load are approximated by the axle load sensors 2 to 4. Not always. That is, in the axle load sensors 2 to 4, even if the measurement accuracy is appropriate, the measured axle load may be close to the true value or relatively small with respect to the true value. , It may be a relatively large value with respect to the true value. However, statistically speaking, if the measurement accuracy of the axle weight sensors 2 to 4 is appropriate, if the axle weight is measured for a certain number of axles (thousands to tens of thousands), the axle weights of these axles will be measured. The average value of the true values of is close to the average value of the measured values of the axle weights of these axles.

From this, as a total result of totaling the measured values of the axle weights measured for a certain number of axles for each of the axle weight sensors 2 to 4, the total (total) of the measured values of the axle weights measured for these axles, If the average value of the measured values of the axle weights measured for these axles, the root mean square of the axle weights measured for these axles, etc. are acquired, the measurement accuracy is appropriate between the axle weight sensors 2 to 4. The results are about the same. On the other hand, there is a certain difference in the above-mentioned tabulation results between the axle load sensors 2 to 4 having different measurement accuracy.

The axle load measuring device 1 of this example acquires the average value of the measured axle load as the above-mentioned aggregation result. The axle load measuring device 1 calculates the absolute value of the difference of the aggregation result (corresponding to the difference amount of the aggregation result in the present invention) for each combination of the two axle load sensors 2 to 4. In this example, the axle load measuring device 1 is
(1) The absolute value of the difference in the aggregated results between the axle load sensor 2 and the axle load sensor 3 (hereinafter, this is referred to as the first determination value X1) is calculated.
(2) The absolute value of the difference in the aggregated results between the axle load sensor 2 and the axle load sensor 4 (hereinafter, this is referred to as a second determination value X2) is calculated.
(3) The absolute value of the difference between the aggregated results between the axle load sensor 3 and the axle load sensor 4 (hereinafter, this is referred to as a third determination value X3) is calculated.

In this example, since the axle load sensors 2 to 4 are three examples, there are three combinations, but when there are four axle load sensors, there are six combinations, and the axle load sensors are. If there are five, there are ten combinations. Further, the first determination value, the second determination value, and the third determination value may be collectively referred to as a determination value.

If the first determination value X1 does not exceed the set threshold value Tth, the axle load measuring device 1 determines that the measurement accuracy of the axle load sensor 2 and the axle load sensor 3 is appropriate. If the first determination value X1 exceeds the set threshold value Tth, the axle load measuring device 1 determines that the measurement accuracy of at least one of the axle load sensor 2 or the axle load sensor 3 is not appropriate. Similarly, if the second determination value X2 does not exceed the set threshold value Tth, the axle load measuring device 1 determines that the measurement accuracy of the axle load sensor 2 and the axle load sensor 4 is appropriate. If the second determination value X2 exceeds the set threshold value Tth, the axle load measuring device 1 determines that the measurement accuracy of at least one of the axle load sensor 2 or the axle load sensor 4 is not appropriate. Further, the axle load measuring device 1 determines that the measurement accuracy of the axle load sensor 3 and the axle load sensor 4 is appropriate if the third determination value X3 does not exceed the set threshold value Tth. If the third determination value X3 exceeds the set threshold value Tth, the axle load measuring device 1 determines that the measurement accuracy of at least one of the axle load sensor 3 or the axle load sensor 4 is not appropriate.

For example, the axle load measuring device 1 is
(A) By comparing the first determination value X1 with the threshold value Tth, it is determined that the measurement accuracy of the axle load sensor 2 and the axle load sensor 3 is appropriate.
(B) By comparing the second determination value X2 with the threshold value Tth, it is determined that the measurement accuracy of at least one of the axle load sensor 2 or the axle load sensor 4 is not appropriate.
(C) When it is determined by comparing the third determination value X3 with the threshold value Tth that the measurement accuracy of at least one of the axle load sensor 3 or the axle load sensor 4 is not appropriate.
It is determined that the measurement accuracy of the axle load sensor 2 and the axle load sensor 3 is appropriate, and the measurement accuracy of the axle load sensor 4 is not appropriate.

As described above, in the axle load measuring device 1 according to this example, is the measurement accuracy of the axle load sensors 2 to 4 arranged side by side in the traveling direction of the vehicle 100 appropriate regardless of whether or not the special vehicle is traveling? You can judge whether or not.

<2. Configuration example>
FIG. 2 is a block diagram showing a configuration of a main part of the axle load measuring device according to this example. The axle load measuring device 1 according to this example includes a control unit 11, an axle load sensor connecting unit 12, a loop coil sensor connecting unit 13, a measured value database 14 (measured value DB 14), and an output unit 15. ing.

The control unit 11 controls the operation of each part of the axle load measuring device 1 main body according to this example. Further, the control unit 11 has a measurement value calculation unit 21, a measurement data generation unit 22, an aggregation unit 23, a difference amount calculation unit 24, and a determination unit 25. The details of the measurement value calculation unit 21, the measurement data generation unit 22, the aggregation unit 23, the difference amount calculation unit 24, and the determination unit 25 included in the control unit 11 will be described later.

The measurement signals of the connected axle load sensors 2 to 4 are input to the axle load sensor connection unit 12. Specifically, the axle load sensors 2R to 4R and 2L to 4L are connected to the axle load sensor connection unit 12, and the measurement signals of the axle load sensors 2R to 4R and 2L to 4L are input. The axle load sensor connection unit 12 converts the input measurement signals of the wheel load sensors 2R to 4R and 2L to 4L into digital values and outputs them to the control unit 11.

Vehicle detection sensors 6 and 7 are connected to the loop coil sensor connection unit 13. The loop coil sensor connection unit 13 detects a change in inductance for each of the vehicle detection sensors 6 and 7, and outputs a vehicle detection signal indicating the presence or absence of the vehicle 100 to the control unit 11.

The measured value DB 14 is a database for accumulating the measured data and the calculated data generated for the vehicle 100 traveling in the measurement section. The measurement data generation unit 22, which will be described later, generates measurement data and calculation data. The details of the measurement data and the calculation data will be described later. The measured value DB 14 corresponds to the measured value collecting unit referred to in the present invention.

The output unit 15 sets the determination result of determining whether or not the measurement accuracy is appropriate for each axle load sensor 2, the measurement data of the vehicle 100 traveling in the measurement section, the calculation data, and the like as necessary as a higher-level device (not shown). ).

Next, the measurement value calculation unit 21, the measurement data generation unit 22, the aggregation unit 23, the difference amount calculation unit 24, and the determination unit 25 included in the control unit 11 will be described.

The measured value calculation unit 21 is a measurement signal (actually, the axle load sensor) when the wheel of the vehicle 100 passes through the wheel load sensors 2R to 4R and 2L to 4L for each wheel load sensor 2R to 4R, 2L to 4L. The wheel load is calculated using the digital value converted at the connection unit 12).

The measurement data generation unit 22 uses the vehicle detection signal input from the loop coil sensor connection unit 13 to divide the wheel load calculated by the measurement value calculation unit 21 into 100 units of vehicles traveling in the measurement section. The measurement data generation unit 22 generates measurement data for each of the axle load sensors 2 to 4. In this example, the measurement data generation unit 22 generates this measurement data for each vehicle.

FIG. 3 is a diagram showing measurement data of the axle load sensor. FIG. 3A is the measurement data of the axle load sensor 2, FIG. 3B is the measurement data of the axle load sensor 3, and FIG. 3C is the measurement data of the axle load sensor 4. The measurement data shown in FIGS. 3A to 3C are for the same vehicle 100. As shown in FIG. 3, this measurement data is associated with a vehicle ID that identifies the vehicle 100. This vehicle ID is not for specifying the vehicle 100, but for each vehicle 100 traveling in the measurement section, the measurement data of the axle load sensor 2, the measurement data of the axle load sensor 3, and the measurement data of the axle load sensor 4. Is associated with.

Further, here, the axle on the most front side of the vehicle 100 is set as the first axis, and the second axis and the third axis are set in order toward the tail side. The wheel load (right) of each axle load sensor 2 to 4 shown in FIG. 3 is a wheel load calculated using the measurement signals of the corresponding wheel load sensors 2R to 4R (in the figure, RA1, RB1, RC1 and the like are shown. It is.). The wheel load (left) of each axle load sensor 2 to 4 shown in FIG. 3 is a wheel load calculated using the measurement signals of the corresponding wheel load sensors 2L to 4L (in the figure, LA1, LB1, LC1 and the like are shown. It is.). Further, the axle load of each axle load sensor 2 to 4 shown in FIG. 3 is a wheel load calculated by using the measurement signals of the corresponding wheel load sensors 2R to 4R and the measurement signals of the corresponding wheel load sensors 2L to 4L. It is the sum with the axle load calculated using.

The measurement data shown in FIG. 3 is an example of the vehicle 100 having three axles, and in the case of the vehicle 100 having two axles, the data related to the third axle is not included. Further, in the case of the vehicle 100 having four or more axles, data related to the fourth axis, the fifth axis, and the like are included according to the number of axles.

Further, the measurement data generation unit 22 generates the calculation data shown in FIG. This calculated data is calculated based on the measurement results of the axle load sensors 2 to 4. Similar to the measurement data shown in FIG. 3, the calculated data is associated with a vehicle ID that identifies the vehicle 100. This vehicle ID is not for specifying the vehicle 100, but is associated with the measurement data shown in FIG. As shown in FIG. 4, in this calculation data, the wheel load (right), the wheel load (left), and the axle load are registered for each axle of the vehicle 100. The wheel load (right) of each axle is an average value of the wheel load calculated by using the measurement signals of the wheel load sensors 2R to 4R for the wheel weight of the wheel. Further, the wheel load (left) of each axle is an average value of the wheel load calculated by using the measurement signals of the wheel load sensors 2L to 4L for the wheel weight of the wheel. The axle load of each axle is the sum of the axle load (right) and the axle load (left) of that axle. The vehicle weight, which is the weight of the vehicle 100, is the sum (total) of the axle load of the vehicle 100.

The measurement data generation unit 22 registers the measurement data of the axle load sensors 2 to 4 generated for each vehicle 100 and the calculation data calculated for the vehicle 100 in the measurement value DB 14.

The measurement data and the calculation data shown in FIG. 3 are associated with the date and time when the vehicle 100 travels in the measurement section.

The aggregation unit 23 aggregates the measurement data of the axle load sensors 2 to 4 registered in the measurement value DB 14 for the vehicle group to be aggregated (thousands to tens of thousands of vehicles 100). Specifically, the aggregation unit 23 calculates the average value of the axle load in the vehicle group to be aggregated for each axle load sensor 2 to 4.

The difference amount calculation unit 24 calculates the absolute value of the difference between the average values of the axle loads calculated by the aggregation unit 23 for each combination of the two axle load sensors 2 to 4. Specifically, the difference amount calculation unit 24
(1) The absolute value (first determination value X1) of the difference between the average value of the axle load calculated for the axle load sensor 2 and the average value of the axle load calculated for the axle load sensor 3 is calculated.
(2) The absolute value (second determination value X2) of the difference between the average value of the axle load calculated for the axle load sensor 2 and the average value of the axle load calculated for the axle load sensor 4 is calculated.
(3) The absolute value (third determination value X3) of the difference between the average value of the axle load calculated for the axle load sensor 3 and the average value of the axle load calculated for the axle load sensor 4 is calculated.

The determination unit 25 uses the first determination value X1, the second determination value X2, and the third determination value X3 calculated by the difference amount calculation unit 24, and the measurement accuracy of the axle load sensors 2 to 4 is appropriate. Is determined. Specifically, the determination unit 25 determines that the measurement accuracy of the axle load sensor 2 and the axle load sensor 3 is appropriate if the first determination value X1 does not exceed the set threshold value Tth. If the first determination value X1 exceeds the set threshold value Tth, the determination unit 25 determines that the measurement accuracy of at least one of the axle load sensor 2 or the axle load sensor 3 is not appropriate. Similarly, if the second determination value X2 does not exceed the set threshold value Tth, the determination unit 25 determines that the measurement accuracy of the axle load sensor 2 and the axle load sensor 4 is appropriate. If the second determination value X2 exceeds the set threshold value Tth, the determination unit 25 determines that the measurement accuracy of at least one of the axle load sensor 2 or the axle load sensor 4 is not appropriate. Further, the determination unit 25 determines that the measurement accuracy of the axle load sensor 3 and the axle load sensor 4 is appropriate if the third determination value X3 does not exceed the set threshold value Tth. If the third determination value X3 exceeds the set threshold value Tth, the determination unit 25 determines that the measurement accuracy of at least one of the axle load sensor 3 or the axle load sensor 4 is not appropriate.

The threshold value Tth is stored in a memory (not shown) provided in the control unit 11.

The control unit 11 of the axle load measuring device 1 is composed of a hardware CPU, a memory, and other electronic circuits. When the hardware CPU executes the measurement accuracy diagnosis program according to the present invention, it operates as a measurement value calculation unit 21, a measurement data generation unit 22, an aggregation unit 23, a difference amount calculation unit 24, and a determination unit 25. Further, the memory has an area for developing the measurement accuracy diagnosis program according to the present invention and an area for temporarily storing data and the like generated when the measurement accuracy diagnosis program is executed. The control unit 11 may be an LSI in which a hardware CPU, a memory, and the like are integrated. Further, the hardware CPU is a computer that executes the measurement accuracy diagnosis method according to the present invention.

<3. Operation example>
The axle load measuring device 1 according to this example determines whether the axle load and the vehicle weight are measured for the vehicle 100 traveling in the measurement section, and whether the measurement accuracy is appropriate for each of the axle load sensors 2 to 4. Judgment Measurement accuracy Diagnosis processing is performed.

FIG. 5 is a flowchart showing a measurement process of the axle load measuring device according to this example. The axle load measuring device 1 waits for the vehicle 100 to enter the measurement section (s1). The control unit 11 detects that the vehicle 100 has entered the measurement section due to a change in the inductance of the vehicle detection sensor 6 connected to the loop coil sensor connection unit 13.

When it is detected that the vehicle 100 has entered the measurement section, the measurement value calculation unit 21 stores the measurement signal for each of the wheel load sensors 2R to 4R and 2L to 4L connected to the axle load sensor connection unit 12. Accumulately memorize in (s2). That is, when it is detected that the vehicle 100 has entered the measurement section, the measurement value calculation unit 21 starts a process of accumulating the measurement signal in the memory for each of the wheel load sensors 2R to 4R and 2L to 4L. do. The time interval for storing the measurement signals of the wheel load sensors 2R to 4R and 2L to 4L is, for example, several tens of msec to several hundreds of msec.

When it is detected that the vehicle 100 has left the measurement section (s3), the measurement value calculation unit 21 accumulates the measurement signal in the memory for each of the wheel load sensors 2R to 4R and 2L to 4L started in s2. The process of storing is terminated (s4). The measured value calculation unit 21 processes the measurement signals accumulated in the memory for each of the wheel load sensors 2R to 4R and 2L to 4L, and calculates the wheel load of each axle (s5).

The measurement signals of the wheel load sensors 2R to 4R and 2L to 4L change when the wheels of the vehicle 100 pass through. Therefore, the measurement value calculation unit 21 can obtain the number of axles of the vehicle 100 by counting the points where the measurement signals of the wheel load sensors 2R to 4R and 2L to 4L have changed. Further, the measurement value calculation unit 21 can extract the measurement signal when the wheel of each axle passes for each of the wheel load sensors 2R to 4R and 2L to 4L, and can calculate the wheel load.

The measurement data generation unit 22 generates the measurement data shown in FIG. 3 for the vehicle 100 that has passed the measurement section this time (s6). This measurement data can be generated based on the wheel load of each axle calculated by the measurement value calculation unit 21 for each wheel load sensor 2R to 4R, 2L to 4L. Further, the measurement data generation unit 22 generates the calculation data shown in FIG. 4 (s7). This calculated data can be generated based on the measurement data generated in s6. That is, this calculation data can also be generated based on the wheel load of each axle calculated by the measured value calculation unit 21 for each wheel load sensor 2R to 4R, 2L to 4L.

The measurement data generation unit 22 stores the measurement data generated in s6 and the calculated data generated in s7 in the measurement value DB 14 (s8), and returns to s1.

As described above, the axle load measuring device 1 accumulates and stores the measurement data shown in FIG. 3 in the measured value DB 14 for each vehicle 100 that has passed the measurement section. Further, the axle load measuring device 1 detects whether the vehicle is an overloaded vehicle 100 or not, and whether the vehicle 100 is in an unevenly loaded state in which the cargo is biased to the left or right, based on the calculated data generated in s7. Can also be done. Further, the calculated data accumulated and stored in the measured value DB 14 can be used as useful information for determining the necessity of road repair work or the like.

Next, the measurement accuracy diagnosis process will be described. FIG. 6 is a flowchart showing a measurement accuracy diagnosis process of the axle load measuring device according to this example. This measurement accuracy diagnosis process is a process executed at an appropriate timing. For example, it may be 0:00 am every Monday, 0:00 am on the first day of every month, 0:00 am on the first day of even or odd months, etc., or at the timing instructed by the administrator. May be good.

The control unit 11 determines the target vehicle group (s11). The number of vehicles 100 belonging to this target vehicle group is several thousand to tens of thousands. For example, the vehicle 100 that has passed the measurement section in the last week, the vehicle 100 that has passed the measurement section in the last month, and the like may be the vehicle 100 belonging to the target vehicle group, and finally the measurement section. The vehicle 100 that has passed through the vehicle 100 may be set as the first vehicle, and may be a predetermined number (thousands to tens of thousands) of vehicles that are continuous with the vehicle 100. Further, the vehicle 100 belonging to the target vehicle group may be limited by the number of axles. For example, the vehicle 100 belonging to the target vehicle group may be provided with conditions such as the vehicle 100 having two axles and the vehicle 100 having three or less axles.

The totaling unit 23 reads out the measurement data stored in the measured value DB 14 for each vehicle 100 belonging to the target vehicle group determined in s11, and measures the vehicle 100 belonging to the target vehicle group for each axle load sensor 2 to 4. The average value of the axle load is calculated as the aggregation result (s12). Since the number of vehicles 100 belonging to the target vehicle group determined in s11 is several thousand to tens of thousands, statistically speaking, the aggregated results are obtained between the axle load sensors 2 to 4 having substantially the same measurement accuracy. The average value of the axle load calculated as is substantially the same. On the other hand, there is a certain difference in the average value of the axle load calculated as the aggregation result between the axle load sensors 2 to 4 whose measurement accuracy is not substantially the same.

The difference amount calculation unit 24 calculates the absolute value of the difference between the average values of the axle loads calculated by the aggregation unit 23 for each combination of the two axle load sensors 2 to 4 as a determination value (s13). Specifically, the difference amount calculation unit 24
(1) The absolute value (first determination value X1) of the difference between the average value of the axle load calculated for the axle load sensor 2 and the average value of the axle load calculated for the axle load sensor 3 is calculated.
(2) The absolute value (second determination value X2) of the difference between the average value of the axle load calculated for the axle load sensor 2 and the average value of the axle load calculated for the axle load sensor 4 is calculated.
(3) The absolute value (third determination value X3) of the difference between the average value of the axle load calculated for the axle load sensor 3 and the average value of the axle load calculated for the axle load sensor 4 is calculated.

The determination unit 25 uses the first determination value X1, the second determination value X2, and the third determination value X3 calculated by the difference amount calculation unit 24, and measures the measurement accuracy for each of the axle load sensors 2 to 4. Is appropriate. Specifically, the determination unit 25 determines whether or not there is a determination value (first determination value X1, second determination value X2, and third determination value X3) that exceeds the set threshold value Tth. (S14). If there is no determination value exceeding the set threshold value Tth, that is, if the first determination value X1, the second determination value X2, and the third determination value X3 are all equal to or less than the threshold value Tth. , It is determined that the measurement accuracy of all the axle load sensors 2 to 4 is appropriate (s15).

Further, if there is a determination value that exceeds the threshold value Tth, the determination unit 25 determines whether or not there is a determination value that does not exceed the threshold value Tth (s16). In s16, it is determined whether or not all of the determination values (first determination value X1, second determination value X2, and third determination value X3) calculated in s13 exceed the threshold value Tth. When all of the determination values calculated in 13 exceed the threshold value Tth, the determination unit 25 determines that there are axle load sensors 2 to 4 whose measurement accuracy is not appropriate (s20). In s20, the determination unit 25 does not specify the axle load sensors 2 to 4 whose measurement accuracy is not appropriate.

Further, when the determination unit 25 determines in s16 that there is a determination value that does not exceed the threshold value Tth, the determination unit 25 determines whether or not there are a plurality of determination values that exceed the threshold value Tth (s17). In other words, in s17, it is determined whether or not there is one determination value that does not exceed the threshold value. If there is one determination value that does not exceed the threshold value, the determination unit 25 determines in s20 that there are axle load sensors 2 to 4 whose measurement accuracy is not appropriate.

When the determination unit 25 determines in s17 that there are a plurality of determination values exceeding the threshold value Tth, the determination unit 25 is common to all combinations of axle load sensors 2 to 4 related to the determination values in the plurality of determination values exceeding the threshold value Tth. It is determined whether or not the axle load sensors 2 to 4 are included (s18). In this example, there are three axle load sensors 2 to 4, so if there are two determination values that exceed the threshold value, the combination of axle load sensors 2 to 4 related to the determination values that exceed this threshold value All include common axle load sensors 2-4. Therefore, in this example, it is not necessary to provide the processing related to s18. On the other hand, when there are four or more axle load sensors, the axle load sensors common to all combinations of axle load sensors 2 to 4 related to the determination values in a plurality of determination values exceeding the threshold value Tth. 2-4 may not be included. That is, the process related to s18 is a necessary process when four or more axle load sensors 2 to 4 are used.

In s18, the determination unit 25 includes the axle load sensors 2 to 4 that are common to all the combinations of the axle load sensors 2 to 4 related to the determination values in the plurality of determination values exceeding the threshold value Tth. If it is determined, it is determined that the measurement accuracy of the common axle load sensors 2 to 4 is not appropriate (s19).

It should be noted that the determination unit 25 includes the axle load sensors 2 to 4 that are common to all the combinations of the axle load sensors 2 to 4 related to the determination values in the plurality of determination values exceeding the threshold value Tth in s18. If not, it is determined in s20 that there are axle load sensors 2 to 4 whose measurement accuracy is not appropriate.

The control unit 11 outputs the determination result (determination result in s15, s19, or s20) by the determination unit 25 from the output unit 15 to the host device (s21), and ends this process.

As described above, in the axle load measuring device 1 according to this example, is the measurement accuracy of the axle load sensors 2 to 4 arranged side by side in the traveling direction of the vehicle 100 appropriate regardless of whether or not the special vehicle is traveling? You can judge whether or not.

In the above example, it is assumed that the average value of the axle load measured for the vehicles 100 belonging to the target vehicle group is calculated as the aggregation result for each axle load sensor 2 to 4, but for each axle load sensor 2R to 4R, 2L to 4L. , The average value of the wheel load measured for the vehicle 100 belonging to the target vehicle group may be calculated as the aggregation result. In this case, if the above-mentioned measurement accuracy diagnosis process is executed using the aggregated results of the wheel load sensors 2R to 4R, it can be determined whether or not the measurement accuracy of the wheel load sensors 2R to 4R is appropriate. Further, if the above-mentioned measurement accuracy diagnosis process is executed using the aggregated results of the wheel load sensors 2L to 4L, it is possible to determine whether or not the measurement accuracy of the wheel load sensors 2L to 4L is appropriate.

Further, in the above example, it is assumed that the axle load sensors 2 to 4 are composed of a pair of wheel load sensors 2R to 4R and 2L to 4L, but even if they are an integrated type that is not divided into left and right. good.

Further, in addition to measuring the wheel load of each wheel of the vehicle 100, the axle load of each axle of the vehicle 100, and the weight of the vehicle 100, the axle load measuring device 1 measures the speed of the vehicle 100 and the distance between the axles of the vehicle 100. The distance and the like may be measured and additionally registered in the calculated data shown in FIG.

<4. Modification example>
FIG. 7 is a block diagram showing a configuration of a main part of the axle load measuring device according to another example. The axle load measurement value 1A according to this example is different from the above example in that it includes a threshold value setting unit 26. In the above example, it is assumed that the threshold value Tth to be compared with the judgment values (first judgment value X1, second judgment value X2, and third judgment value X3) is set in advance, but in this example, it is aggregated. The threshold value setting unit 26 sets the threshold value Tth according to the aggregation result acquired by the unit 23 for each of the axle load sensors 2 to 4. The aggregation result is, for example, the average value of the axle load measured for the vehicles 100 belonging to the target vehicle group.

In this example, the threshold setting unit 26 uses the minimum value of the aggregated result acquired for each of the axle load sensors 2 to 4, the maximum value of the aggregated result acquired for each of the axle load sensors 2 to 4, or every of the axle load sensors 2 to 4. Use one of the average values of the aggregated results obtained in 1 as the reference value. The value to be set as the reference value by the threshold value setting unit 26 may be determined in advance. The threshold value setting unit 26 sets the threshold value Tth based on the reference value. For example, the threshold value setting unit 26 sets a predetermined ratio (for example, 3%, 5%, 10%) of the reference value to the threshold value Tth.

In this way, the threshold value setting unit 26 sets the threshold value Tth according to the measured value of the axle load in the axle load sensors 2 to 4, so that the determination accuracy of whether or not the measurement accuracy is appropriate can be improved.

The threshold value setting unit 26 may execute the process of setting the threshold value Tth between s12 and s14 shown in FIG. That is, the threshold value setting unit 26 may execute the process of setting the threshold value Tth before the process related to s13 shown in FIG. 6 or after the process related to s13.

Further, in the above example, it is assumed that the average value of the axle load measured for the vehicle 100 belonging to the target vehicle group is acquired as the aggregation result for each axle load sensor 2 to 4, but the aggregation result belongs to the target vehicle group. It may be the sum of the axle load measured for the vehicle 100, or the root mean square of the axle load measured for the vehicle 100 belonging to the target vehicle group.

Further, in the above example, the example in which the three axle load sensors 2 to 4 are arranged in the traveling direction of the vehicle 100 has been described, but the number of axle load sensors 2 to 4 arranged in the traveling direction of the vehicle 100 is two or more. If there is, it may be any number.

It should be noted that the present invention is not limited to the above-described embodiment as it is, and at the implementation stage, the components can be modified and embodied within a range that does not deviate from the gist thereof. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in the above-described embodiment. For example, some components may be removed from all the components shown in the embodiments. In addition, components from different embodiments may be combined as appropriate.

Further, the correspondence between the configuration according to the present invention and the configuration according to the above-described embodiment can be described as described in the following appendix.
<Additional Notes> The axle load sensor connection unit (12) to which the measurement signals of a plurality of axle load sensors (2 to 4) arranged side by side in the traveling direction of the vehicle (100) are input, and
A measurement value collection unit (14) that collects measurement values according to the input measurement signal for each of the axle load sensors (2 to 4), and a measurement value collection unit (14).
For each axle load sensor (2 to 4), the aggregate unit (23) that aggregates the collected measured values and acquires the aggregated result, and
A difference amount calculation unit (24) that calculates the difference amount of the aggregation result between the two axle load sensors (2 to 4), and
An axle load measuring device (1) including a determination unit (25) for determining whether the measurement accuracy of the axle load sensor is appropriate depending on whether the difference amount is within an appropriate range.

1, 1A ... Axle weight measurement value 2 ... Axle weight sensor 2 to 4 ... Axle weight sensor 2R to 4R, 2L to 4L ... Wheel weight sensor 2R ... Wheel weight sensor 6, 7 ... Vehicle detection sensor 11 ... Control unit 12 ... Shaft Heavy sensor connection 13 ... Loop coil sensor connection 14 ... Measured value database (measured value DB)
15 ... Output unit 21 ... Measurement value calculation unit 22 ... Measurement data generation unit 23 ... Aggregation unit 24 ... Difference amount calculation unit 25 ... Judgment unit 26 ... Threshold setting unit 100 ... Vehicle

Claims (9)

The axle load sensor connection part where the measurement signals of multiple axle load sensors arranged side by side in the traveling direction of the vehicle are input, and the axle load sensor connection part.
A measurement value collection unit that collects measurement values according to the input measurement signal for each axle load sensor,
A totaling unit that aggregates the collected measured values and acquires the aggregated results for each axle load sensor.
A difference amount calculation unit that calculates the difference amount of the aggregation result between the two axle load sensors,
An axle load measuring device including a determination unit for determining whether the measurement accuracy of the axle load sensor is appropriate depending on whether the difference amount is within an appropriate range. Three or more axle load sensors are arranged side by side in the traveling direction of the vehicle.
The difference amount calculation unit calculates the difference amount of the aggregation result for each combination of the two axle load sensors.
The axle load measuring device according to claim 1, wherein the determination unit determines that there is the axle load sensor whose measurement accuracy is not appropriate if there is a combination of the two axle load sensors whose difference amount is not within the appropriate range. .. The determination unit extracts a combination of the two axle load sensors whose difference amount is not within the appropriate range, and if one of the axle load sensors is common to all the extracted combinations, this is common. The axle load measuring device according to claim 2, wherein it is determined that the measurement accuracy of the axle load sensor is not appropriate. The axle load measurement according to any one of claims 1 to 3, further comprising an appropriate range setting unit for setting the appropriate range based on the aggregation result in which the aggregation unit aggregates the measured values for each axle load sensor. Device. The axle load measuring device according to any one of claims 1 to 4, wherein the aggregation unit acquires an average value of measured values collected as the aggregation result for each axle load sensor. The axle load measuring device according to any one of claims 1 to 5, wherein the axle load sensor is a pair of wheel load sensors arranged in the vehicle width direction. The axle load measuring device according to any one of claims 1 to 6 , further comprising a vehicle weight calculation unit that calculates the weight of the vehicle by using the measurement signals of the plurality of axle load sensors when the vehicle is traveling. A measurement value collection step that collects measurement values according to the measurement signal input from the axle load sensors for each of a plurality of axle load sensors arranged side by side in the traveling direction of the vehicle.
For each axle load sensor, a totaling step for totaling the collected measured values and acquiring the totaling result, and
A difference amount calculation step for calculating the difference amount of the aggregation result between the two axle load sensors, and
A measurement accuracy diagnosis method comprising a determination step for determining whether or not the measurement accuracy of the axle load sensor is appropriate depending on whether or not the difference amount is within an appropriate range. A measurement value collection step that collects measurement values according to the measurement signal input from the axle load sensors for each of a plurality of axle load sensors arranged side by side in the traveling direction of the vehicle.
For each axle load sensor, a totaling step for totaling the collected measured values and acquiring the totaling result, and
A difference amount calculation step for calculating the difference amount of the aggregation result between the two axle load sensors, and
A measurement accuracy diagnosis program that causes a computer to execute a determination step for determining whether or not the measurement accuracy of the axle load sensor is appropriate depending on whether or not the difference amount is within an appropriate range.

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