JP6223815B2 - Axle load measuring device - Google Patents

Description

  The present invention relates to an axle weight measuring apparatus that measures the axle weight of a vehicle, and more particularly to an axle weight measuring apparatus that measures the axle weight of the vehicle in a running state.

  A vibration force of a relatively low frequency (several Hz to several tens Hz) due to the spring characteristics of the suspension of the vehicle, road surface unevenness, and the like is applied to each wheel (tire) of the vehicle in a running state. Therefore, in order to accurately measure the axle weight of the vehicle in the running state, it is necessary to suppress the influence of this vibration force. Conventionally, for example, there is a technique disclosed in Patent Document 1 as a technique for that purpose.

  According to this prior art, a plurality of, more specifically, three or more measuring instruments are provided on the road surface on which the vehicle travels. Each measuring instrument is arranged such that when the vehicle travels on the road surface, the wheels or axles of the vehicle pass through the respective measuring platforms in order. Then, as the wheel or axle passes through each weighing platform, the weight of the wheel or axle, that is, wheel weight or axle weight, is measured. When the wheel load is measured, the axial load is obtained by adding the measured values of the left and right wheel loads. Furthermore, by obtaining the average value of the measured values of the axle load by each measuring instrument, the average value in which the influence of the above-described vibration force is suppressed is obtained, which is the axis that is the final measured value of the axle load. A double final measurement is obtained, that is, an accurate axial load measurement is performed.

  In addition, this conventional technique is provided with a function of diagnosing whether any span abnormality has occurred in any of the measuring instruments and correcting the span abnormality when it has occurred. Specifically, when a wheel or axle passes multiple times on each weighing platform, the weight measurement value (wheel weight measurement value or axle weight measurement value) of the wheel or axle is measured for each weighing instrument. An average value is calculated. Then, the calculated average value for each measuring instrument is compared with each other, and the result of this comparison is compared with a predetermined allowable value, so that a span abnormality occurs in any measuring instrument. A determination is made whether or not Here, when it is determined that a span abnormality has occurred in any of the measuring instruments, the average value of the weight measurement values determined by the measuring instrument in which the span abnormality has been determined and the other non-span abnormality are determined. Based on the average value of the weight measurement values by the measuring instrument, the span of the measuring instrument determined to have the span abnormality is corrected. Then, using the weight measurement value by this span-corrected weighing instrument and the weight measurement value by each other normal measuring instrument, in the same manner as described above, that is, all the weighing instruments are normal. The final axial load measurement value is obtained in the same manner as that, and so on, the axial load measurement is tentatively continued.

JP 2012-42219 A

  As described above, in the prior art, when a span abnormality occurs in any of the measuring instruments, the span of the measuring instrument in which the span abnormality has occurred is corrected, and then all the measuring instruments including the measuring instrument having the span corrected are corrected. Provisional axle load measurement is performed using (weight measurement value). In this provisional axle load measurement, for example, it may be possible to exclude a measuring instrument in which a span abnormality has occurred from the axle load measurement. However, in the prior art, such operation is difficult. . This is because, if a measuring instrument in which a span abnormality has occurred is excluded from the axial load measurement, the effect of measuring the axial load by using a plurality of measuring instruments, that is, the effect of suppressing the influence of the above-described vibration force is weakened. On the contrary, it is said that an inappropriate result may be obtained (see particularly paragraph 0013 of Patent Document 1).

  By the way, the span abnormality may be caused by the deterioration of the measuring instrument over time. In this case, the span fluctuates (drifts) in a relatively short period of time. May fluctuate significantly in one direction. Even when such a span anomaly accompanied by a sudden span fluctuation occurs, the conventional technology, as described above, the average value of the weight measurement value by the measuring instrument in which the span anomaly has occurred and the other normal weighings. A span correction is made on the basis of the average value of the weight measurements by the vessel, i.e. on the basis of these average values obtained over a corresponding period of time. Axial load measurement is performed using all the measuring instruments. For this reason, there is a problem that the span correction cannot properly follow a span abnormality accompanied by a rapid span fluctuation, and as a result, accurate axial load measurement cannot be realized.

  Therefore, the present invention realizes accurate axial weight measurement by providing a plurality of wheel load meters, and also when the abnormality occurs in any of these multiple wheel load meters, the accurate shaft weight measurement is performed. It is an object of the present invention to provide an axle load measuring device that can continue the above.

In order to achieve this object, the basic configuration of the axle load measuring apparatus of the present invention includes a pair of left and right wheel load gauges, an axle load calculating means, and an abnormality determining means. Of these, the pair of left and right wheel scales are provided at each of three or more measurement positions different from each other in the traveling path of the vehicle in the traveling direction of the vehicle, that is, three (sets) or more. Then, the pair of left and right wheel weight meters provided at each measurement position measures the left and right wheel weights substantially simultaneously and individually for each axle of the vehicle when the axle passes through the measurement position. . Further, the wheel load calculating means, based on the wheel load measurement value that is the wheel load measurement value obtained by each wheel load meter obtained for each axle, the axle load final value that is the final measurement value of the axle weight. Obtain the measured value. In parallel with this, the abnormality determining means determines whether or not an abnormality has occurred in any of the wheel scales based on the wheel weight measurement values of the respective wheel scales. Here, for example, when it is determined by the abnormality determining means that no abnormality has occurred in any of the wheel scales, that is, all of the wheel scales are normal, the axle load calculating means Based on the wheel load measurement values obtained by the respective weigh scales, the final axle load measurement value is obtained. On the other hand, when it is determined by the abnormality determining means that an abnormality has occurred in any one of the wheel weight gauges, the axle load calculating means sets the wheel weight gauge in which the abnormality has occurred as an invalid weight gauge, and A normal wheel load gauge other than the weight scale is set as an effective wheel load gauge. Determine the duplicate final measurement.

That is, according to the basic configuration of the present invention , when all the wheel scales are normal, axial load measurement is performed using all these wheel scales. Thereby, accurate axial load measurement in which the influence of the above-described vibration force is suppressed is realized. In parallel with this, it is determined whether or not an abnormality has occurred in any of the wheel scales, so that an abnormality diagnosis is performed. Then, when it is determined by this abnormality diagnosis that an abnormality has occurred in one of the wheel scales, the wheel scale in which the abnormality has occurred is set as an invalid wheel load scale. In addition, a normal wheel load meter other than the invalid wheel load meter is regarded as an effective wheel load meter. Then, using only the effective wheel load meter, that is, excluding the invalid wheel load meter, the axle load measurement is performed, so that the axle load measurement is tentatively continued. In this provisional axle load measurement, the axle load measurement is performed in a manner according to the abnormal state including the disposition of the invalid wheel load gauge, that is, in a manner different from when all the wheel weight gauges are normal. Is called. As a result, accurate axial load measurement is realized even if it is provisional.

In the basic configuration of the present invention, when provisional axle load measurement is performed, the abnormality determination means is further based on the above-described abnormality mode and the wheel load measurement value by each effective wheel load meter. Thus, one aspect of the present invention is configured by determining whether or not an abnormality has occurred in each of the effective wheel scales . In short, even when temporary axle load measurement is performed, abnormality diagnosis may be performed for each effective wheel load meter used for the temporary axle load measurement.

Here, in the basic configuration of the present invention , depending on the above-described abnormality mode, particularly when the abnormality occurs in a plurality of wheel scales (when there are a plurality of invalid wheel scales), Even with such a procedure, accurate axial load measurement may not be realized, that is, an accurate final axial load measurement value in which the influence of the vibration force is sufficiently suppressed may not be obtained. In order to cope with such a case, the following abnormal mode determination means is provided in the basic configuration of the present invention, and another mode of the present invention is configured . That is, the abnormality mode determination means includes the arrangement of the wheel load gauge (invalid wheel load gauge) in which the abnormality has occurred when the abnormality determination means determines that an abnormality has occurred in any of the wheel load gauges. It is determined whether or not the abnormal mode satisfies a condition for realizing accurate axle load measurement, more specifically, a condition for obtaining an axle load final measurement value with an accuracy of a predetermined level or more. And, for example, when it is determined that the abnormal mode satisfies the condition, that is, accurate axial weight measurement can be realized (probability), a provisional axis according to the procedure according to the abnormal mode The weight measurement is performed. Specifically, the shaft weight final measurement value is obtained by the shaft weight calculation means. On the other hand, when the abnormal condition does not satisfy the condition , that is, when accurate axle load measurement cannot be realized (it is expected), the axle load measurement is stopped. The calculation for obtaining is stopped.

  Furthermore, in the present invention, the following alarm output means may be provided. That is, the alarm output means outputs an alarm indicating that the abnormality determination means determines that an abnormality has occurred in any of the wheel scales. By providing such an alarm output means, it is possible to recognize from the alarm that an abnormality has occurred in any one of the wheel scales, that is, that there is an invalid wheel load scale. The alarm referred to here may be output in an auditory form such as a buzzer sound or voice, or may be output in a visual form such as text or light.

  Further, the alarm may include invalid wheel gauge information indicating which wheel gauge has an abnormality, that is, which wheel gauge is an invalid wheel gauge. . According to such an alarm including invalid wheel loader information, it is possible to intuitively recognize which wheel load gauge has an abnormality, that is, which wheel load gauge is an invalid wheel load gauge. Can do.

  In addition, the above-described abnormal state determination means is provided, and when it is determined by the abnormal state determination means that the above-mentioned abnormal state does not satisfy the above-mentioned conditions, that is, accurate axial load measurement can be realized. If not, an alarm including information indicating that, information prompting early repair, and the like may be output.

  As described above, according to the present invention, when all of the plurality of wheel scales are normal, accurate axial weight measurement is realized using all these wheel scales. When an abnormality occurs in any of the wheel weight gauges, the wheel weight gauge in which the abnormality has occurred is set as an invalid weight gauge, and a normal weight gauge other than the invalid weight gauge is used as an effective weight gauge. On that basis, only the effective wheel load meter is used, that is, the invalid wheel load meter is excluded, so that the axle load measurement is performed tentatively. In this case, the abnormal mode including the arrangement of the invalid wheel load meter is included. The axle load measurement is performed in an appropriate manner according to the conditions. Thereby, even if it is provisional, accurate axial load measurement is continued, and particularly accurate axial load measurement is realized compared to the conventional case.

It is a figure which shows the whole schematic structure of one Embodiment of this invention. It is the illustration figure which looked at a certain pair of right-and-left each wheel scale which comprises the measurement part in the embodiment from the back along a driving direction of a vehicle. It is the illustration figure which looked at the same weight scale from the right side perpendicular to the traveling direction of the vehicle. It is an illustration figure which shows notionally the shift register comprised by the calculating part in the indicator in the same embodiment. It is an illustration figure which shows an example of the abnormal state of the measurement part in the embodiment. It is an illustration figure which shows another example of the abnormal state. It is an illustration figure which shows another example of the abnormal state. It is an illustration figure which shows another example of the abnormal state. It is an illustration figure which shows another example of the abnormal state. It is a flowchart which shows roughly the content of the calculation task performed by the calculating part in the indicator in the same embodiment.

  An embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the axle load measuring apparatus 10 according to the present embodiment includes a weighing unit 20 installed on a linear travel path 200 on which a vehicle 100 travels, and the weighing unit 20 (strictly, the weighing unit 20). And an indicator 30 to which each wheel weight meter 22, 22, 22, 24, 24, and 24), which will be described later, is connected. In FIG. 1, the vehicle 100 travels in the direction indicated by the white arrow 300, that is, travels from the left side to the right side. Further, although not understood from FIG. 1 (as can be seen from FIGS. 2 and 3 described later), the road surface of the traveling road 100 is horizontal. Such an axle load measuring device 10 is applied to, for example, a toll gate on an expressway.

  The weighing unit 20 includes a plurality of, for example, three left wheel weights 22, 22, and 22, and three right wheel weights 24, 24 that are paired with the left wheel weights 22, 22 and 22, respectively. And 24. That is, a total of three pairs of left and right wheel load scales 22 and 24 are provided. These wheel scales 22, 22, 22, 24, 24, and 24 have the same specifications.

  Of the pair (one set) of left and right wheel load gauges 22 and 24, each upper surface (load application surface) of the road surface 200 is one of the road surfaces of the road 200 at a certain first measurement position P <b> 1. And the left wheel 102 must pass through the upper surface of the left wheel load gauge 22 and the right wheel 104 passes through the upper surface of the right wheel load gauge 24 for each axle of the vehicle 100 traveling on the travel path 200. It is arranged so that it always passes. Specifically, as shown in FIG. 2, the left wheel scale 22 has a substantially rectangular flat plate-like weighing platform 22a that forms the upper surface thereof, and one or more, for example, three loads that support the weighing platform 22a. Load sensors 22b, 22b and 22b as detection means, and a substantially rectangular flat plate shape as a base provided substantially symmetrically (plane-symmetrically) with the weighing table 22a with the load sensors 22b, 22b and 22b interposed therebetween The base 22c. The load sensors 22b, 22b and 22b have the same specifications as each other, and are arranged at equal intervals along the longitudinal direction of the upper surface of the weighing table 22a (and the lower surface of the base 22c). As these load sensors 22b, 22b, and 22b, those in which a load cell is adopted in each load detection unit are appropriate, but others, for example, those in which a quartz piezoelectric sensor is adopted in the load detection unit. It may be. Then, the left wheel weight scale 22 has its upper surface (of the weighing platform 22a) forms a part of the road surface of the traveling road 200 as described above, in other words, the upper surface is the same height as the road surface of the traveling road 200, In addition, the upper surface is arranged so that the longitudinal direction of the upper surface is perpendicular to the traveling direction 300 of the vehicle 100, and more specifically, it is installed in a substantially rectangular concave pit 202 formed in the traveling path 200. . Similarly, the right wheel scale 24 having the same specifications as the left wheel scale 22 also has a weighing platform 24 a, three load sensors 24, 24 and 24, and a base 24. In the right wheel load scale 24, the upper surface (of the weighing platform 24 a) forms a part of the road surface of the traveling path 200, and the longitudinal direction of the upper surface is perpendicular to the traveling direction 300 of the vehicle 100. Specifically, it is disposed in a pit 204 having a substantially rectangular concave shape formed on the travel path 200. Note that the one long side of the upper surface of the left side weighing scale 22 and the one long side of the upper surface of the right side weighing scale 24 are on the same straight line, the other long side of the upper surface of the left side weighing scale 22 and the right side. The other long side of the upper surface of the wheel load gauge 24 is on another same straight line. The one short side of the upper surface of the left wheel weight scale 22 and the one short side of the upper surface of the right wheel weight scale 24 are parallel to each other at an appropriate distance. The other short side of the upper surface and the other short side of the upper surface of the right wheel weight 24 are also parallel to each other at a distance.

  The left wheel weight scale 22 arranged at the first measurement position P1 measures the weight of the left wheel 102 passing through its upper surface, that is, the left wheel weight wL, and strictly speaking, the load applied to its upper surface. Outputs an analog load signal representing the magnitude of. Strictly speaking, the output signals of the three load sensors 22b, 22b and 22b described above are combined with each other and output as the analog load signal. On the other hand, the right wheel weight meter 24 arranged at the first measurement position P1 measures the weight of the right wheel 104 passing through the upper surface thereof, that is, the right wheel weight wR, and strictly applied to the upper surface of the wheel. An analog load signal indicating the magnitude of the load is output. Strictly speaking, the output signals of the three load sensors 24b, 24b and 24b described above are combined with each other and output as an analog load signal of the right-hand weight meter 24. The left and right wheel weight gauges 22 and 24 arranged at the first measurement position P1 are assigned individual identification codes (ID). For example, the left wheel weight gauge 22 is assigned an identification code S1L. The right wheel load gauge 24 is assigned an identification code S1R. Thereafter, the left and right wheel scales 22 and 24 arranged at the first measurement position P1 may be expressed by using respective identification codes S1L and S1R.

  A pair of left and right wheel weight gauges 22 and 24 different from the first measurement position P1 is arranged at a position different from the first measurement position P1 on the travel path 200, for example, from the first measurement position P1. It is arranged at a second measurement position P2 at a predetermined distance D12 toward the traveling direction 300 of the vehicle 100. Each of the left and right wheel scales 22 and 24 arranged at the second measurement position P2 also forms a part of the road surface of the traveling road 200 in the same manner as arranged at the first measurement position P1. At the same time, for each axle of the vehicle 100 traveling on the travel path 200, the left wheel 102 always passes the upper surface of the left wheel load gauge 22, and the right wheel 104 always passes the upper surface of the right wheel load gauge 24. So that it is arranged. The left wheel weight meter 22 disposed at the second measurement position P2 measures the left wheel weight wL of the vehicle 100, strictly speaking, an analog load signal indicating the magnitude of the load applied to the upper surface of the vehicle. Output. On the other hand, the right wheel weight meter 24 disposed at the second measurement position P2 measures the right wheel weight wR and strictly outputs an analog load signal indicating the magnitude of the load applied to the upper surface of the right wheel weight wR. The left and right wheel weight gauges 22 and 24 arranged at the second measurement position P2 are also given individual identification codes, for example, the left wheel weight scale 22 is given an identification code S2L. The right wheel load gauge 24 is assigned an identification code S2R. Thereafter, the left and right wheel scales 22 and 24 arranged at the second measurement position P2 may also be expressed using the respective identification codes S1L and S1R.

  Further, the remaining pair of left and right wheel load gauges 22 and 24 are located in a traveling direction 300 of the vehicle 100 from a position different from the first measurement position P1 and the second measurement position P2 of the travel path 200, for example, the second measurement position P2. It is arranged at a third measurement position P3 at a predetermined distance D23. The left and right wheel load scales 22 and 24 arranged at the third measurement position P3 also form a part of the road surface of the traveling road 200 and the respective vehicle 100 traveling on the traveling road 200. For each axle, the left wheel 102 is disposed so as to necessarily pass through the upper surface of the left wheel weight meter 22, and the right wheel 104 is disposed so as to necessarily pass through the upper surface of the right wheel weight meter 24. The left wheel weight meter 22 arranged at the third measurement position P3 measures the left wheel weight wL of the vehicle 100 and strictly outputs an analog load signal indicating the magnitude of the load applied to the vehicle. . On the other hand, the right wheel weight meter 24 arranged at the third measurement position P3 measures the right wheel weight wR, and strictly speaking, outputs an analog load signal indicating the magnitude of the load applied to itself. The left and right wheel scales 22 and 24 arranged at the third measurement position P3 are also provided with individual identification codes. For example, the left wheel scale 22 is provided with an identification code S3L. The right wheel load gauge 24 is assigned an identification code S3R. Thereafter, the left and right wheel scales 22 and 24 arranged at the third measurement position P3 may be expressed using the respective identification codes S3L and S3R.

  Note that the distance D12 between the first measurement position P1 and the second measurement position P2 and the distance D23 between the second measurement position P2 and the third measurement position P3 are equivalent to each other (D12 = D23). It is also possible to make a difference (D12 ≠ D23). The mutual distances D12 and D23 are, for example, about 1 [m] to about a dozen [m].

  In addition, each wheel load meter S1L, S2L, S3L, S1R, S2R, and S3R in the present embodiment is a dynamic measurement method that requires the vehicle 100 to be in a traveling state for wheel load measurement. . Specifically, as shown in FIG. 3, each wheel scale S1L, S2L, S3L, S1R, S2R, and S3R in the traveling direction 300 of the vehicle 100 has a size Da on each wheel of the vehicle 100. It is shorter than the ground contact length Db of 102 or 104 (Da <Db). On the other hand, there is known a hydrometer of the static and double measurement type in which the dimension of the upper surface in the traveling direction 300 of the vehicle 100 is longer than the contact length Db of each wheel 102 or 104 of the vehicle 100. . According to the static and double measurement type wheel load gauge, the vehicle 100 does not need to be in a traveling state, and for example, the case where the vehicle 100 is stationary or traveling at an extremely low speed can be handled. be able to. However, the static load measurement type wheel load scale is more expensive than the dynamic measurement method. That is, according to the present embodiment, by adopting the dynamic measurement method that is cheaper than the static measurement method as each wheel weight meter S1L, S2L, S3L, S1R, S2R, and S3R, Cost reduction of the whole axle load measuring apparatus 10 including each wheel scale S1L, S2L, S3L, S1R, S2R, and S3R is achieved. Incidentally, the wheel load measurement procedure by the dynamic measurement type wheel load meter is disclosed in, for example, the above-mentioned Patent Document 1 (particularly, paragraphs 0040 to 0042 of the specification), and is well known. The description is omitted. Further, the wheel load measurement procedure using a static and double measurement type wheel load meter is disclosed in Patent Document 1 (particularly, paragraphs 0032 to 0039 of the specification) and is well known.

  As described above, the weighing unit 10 is connected to the indicator 30. Strictly speaking, each wheel weight meter S1L, S2L, S3L, S1R, S2R, and S3R is connected to the amplification unit 32 in the indicator 30. The amplifying unit 32 has an amplification circuit (not shown) corresponding to each of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R, and these wheel scales S1L, S2L, Each analog load signal from S3L, S1R, S2R and S3R is amplified. Then, each analog load signal amplified by the amplification unit 32 (each amplification circuit) is input to the A / D conversion unit 34. Note that, on the input side or output side of the amplifying unit 32, relatively high frequencies (for example, 100 [100 [, for example) included in each analog load signal as an input signal to the amplifying unit 32 or an output signal of the amplifying unit 32 are provided. Hz] or higher) may be provided.

  The A / D conversion unit 34 has A / D conversion circuits (not shown) corresponding to the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R, and these A / D conversion circuits Each analog load signal from the amplifying unit 32 is converted into a digital load signal. Then, each digital load signal after conversion by the A / D conversion unit 34 (each A / D conversion circuit) is input to the calculation unit 36.

  The calculation unit 36 generates a noise component having a relatively low frequency (for example, about several tens [Hz]) included in each digital load signal for each digital load signal from the A / D conversion unit 34. Appropriate digital filtering processing such as moving average processing for attenuation is performed. Then, the calculation unit 36 obtains a final measurement value WX of the axial load wX based on the digital load signal after the digital filtering process, as will be described later.

  Various processes performed by the calculation unit 36 including the calculation of the final axial load measurement value WX are performed by a CPU (Central Processing Unit) (not shown) constituting the calculation unit 36. The operation of the CPU is controlled by a control program stored in a memory (not shown) that constitutes the calculation unit 36. Further, the calculation unit 36 (CPU) has an operation unit 38 as a command input unit for inputting various commands to the calculation unit 36 and a display as an information output unit for displaying various information according to control by the calculation unit 36. Are connected to each other. The operation unit 38 and the display unit 40 may be integrated with each other, for example, a touch screen.

  Now, in this embodiment, when the vehicle 100 passes along the travel path 200, for each axle of the vehicle 100, the left wheel 102 first passes over the left wheel scale S1L disposed at the first measurement position P1. At the same time, the right wheel 104 passes over the right wheel weight scale S1R arranged at the first measurement position P1. Thereafter, the left wheel 102 passes over the left wheel scale S2L arranged at the second measurement position P2, and at the same time, the right wheel 104 passes over the right wheel scale S2R arranged at the second measurement position P2. pass. Thereafter, the left wheel 102 passes over the left wheel scale S3L arranged at the third measurement position P3, and at the same time, the right wheel 104 is over the right wheel scale S3R arranged at the third measurement position P3. Pass through. Then, the axial load final measurement value WX is obtained in the following manner.

  That is, based on the digital load signal after the above-described digital filtering processing corresponding to the left wheel weight meter S1L when the left wheel 102 passes over the left wheel weight meter S1L at the first measurement position P1, the left wheel weight is determined. A measured value W1L of the left wheel load wL by the total S1L is obtained. Then, based on the digital load signal after the above-described digital filtering processing corresponding to the right wheel weight meter S1R when the right wheel 104 passes over the right wheel weight meter S1R at the first measurement position P1, the right wheel weight is determined. A measured value W1R of the right wheel weight wR by the total S1R is obtained. Similarly, based on the digital load signal after the above-described digital filtering processing corresponding to the left wheel load gauge S2L when the left wheel 102 passes over the left wheel load gauge S2L at the second measurement position P2, A measured value W2L of the left wheel weight wL by the left wheel weight meter S2L is obtained. Then, based on the digital load signal after the above digital filtering process corresponding to the right wheel weight meter S2R when the right wheel 104 passes over the right wheel weight meter S2R at the second measurement position P2, the right wheel weight is determined. A measured value W2R of the right wheel weight wR by the total S2R is obtained. Further, based on the digital load signal after the above-described digital filtering processing corresponding to the left wheel weight meter S3L when the left wheel 102 passes over the left wheel weight meter S3L at the third measurement position P3, the left wheel weight is determined. A measured value W3L of the left wheel weight wL by the total S3L is obtained. Then, based on the digital load signal after the above-described digital filtering processing corresponding to the right wheel weight meter S3R when the right wheel 104 passes over the right wheel weight meter S3R at the third measurement position P3, the right wheel weight A measured value W3R of the right wheel weight wR by the total S3R is obtained. It is assumed that necessary adjustments such as zero adjustment and span adjustment are appropriately made in advance for each of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R.

  Then, the left wheel weight measurement value W1L by the left wheel weight meter S1L at the first measurement position P1 and the right wheel weight measurement value W1R by the right wheel weight meter S1R at the first measurement position P1 are summed, that is, Based on the following equation 1, the axial weight measurement value W1X at the first measurement position P1 is obtained.

<< Formula 1 >>
W1X = W1L + W1R

  Similarly, by the sum of the left wheel load measurement value W2L by the left wheel load meter S2L at the second measurement position P2 and the right wheel load measurement value W2R by the right wheel load meter S2R at the second measurement position P2, That is, based on the following formula 2, the axial load measurement value W2X at the second measurement position P2 is obtained.

<< Formula 2 >>
W2X = W2L + W2R

  Further, the left wheel weight measurement value W3L by the left wheel weight meter S3L at the third measurement position P3 and the right wheel weight measurement value W3R by the right wheel weight meter S3R at the third measurement position P3, that is, the following Based on Expression 3, the axial load measurement value W3X at the third measurement position P3 is obtained.

<< Formula 3 >>
W3X = W3L + W3R

  Then, the axle load measurement value W1X at the first measurement position P1 based on the equation 1, the axle load measurement value W2X at the second measurement position P2 based on the equation 2, and the axle load measurement at the third measurement position P2 based on the equation 3. Axial load final measurement value WX is obtained by averaging the value W3X, that is, based on the following Equation 4. The obtained axial weight final measurement value WX is displayed on the display unit 40. The axial load final measurement value WX is stored in the above-described memory, and is output to an external device (not shown) as necessary.

<< Formula 4 >>
WX = (W1X + W2X + W3X) / 3

  As described above, according to the present embodiment, the average value of the three axial weight measurement values W1X, W2X, and W3X obtained at the first to third measurement positions P1, P2, and P3 that are different from each other is the final axial weight measurement. By setting the value WX, the accurate final axle load measurement value WX in which the influence of the vibration force described above is suppressed is obtained, that is, accurate measurement of the axle load wX of the vehicle in the running state is realized. The effect of suppressing the influence of this vibration force will be verified as follows.

  First, for comparison purposes, a configuration in which only a pair of left and right wheel load gauges SL and SR similar to those in the present embodiment is provided at a certain position on the travel path 200 is assumed. In this configuration, the sum of the measured values WL and WR of the left and right wheel weights wL and wR by the pair of left and right wheel weight meters SL and SR is set as the axial load final measured value WX. That is, the axial load final measurement value WX is obtained based on the following equation (5).

<< Formula 5 >>
WX = WL + WR

  Here, for example, it is assumed that the above-described vibration force appears as sine wave noise of a · sin (ω · t) in each of the left and right wheel weight measured values WL and WR by the left and right wheel weight meters SL and SR. Here, a is an amplitude, ω is an angular frequency, and t is time (timing). Then, assuming that the left and right wheel load measurement values WL and WR obtained at a certain timing t = t0 are applied to Equation 5, Equation 5 is expressed as Equation 6 below.

<< Formula 6 >>
WX = {wL + a · sin (ω · t0)} + {wR + a · sin (ω · t0)}
= (WL + wR) + 2 · a · sin (ω · t0)
∵ WL = wL + a · sin (ω · t0)
WR = wR + a · sin (ω · t0)

  Here, even if the frequency f (= ω / (2 · π)) of the vibration force noise a · sin (ω · t) is constant, each of the left and right sides depends on the speed of the vehicle 100 traveling on the road 200. The phase t of the vibration force noise a · sin (ω · t) appearing in each of the wheel load measurement values WL and WR changes, that is, the vibration force noise component 2 · a included in the shaft load final measurement value WX (Equation 6). The magnitude of sin (ω · t0) changes. In particular, in the application to the toll gate of the expressway described above, the traveling speed of the vehicle 100 ranges from a few [km / h] to several tens [km / h]. In view of these things, the vibration force noise a · sin (ω · t) can be regarded as a kind of random noise.

  Further, for example, assuming that the standard deviation σ of the variation amount nb of the vibration force noise a · sin (ω · t) is σ = 2 · α, in the configuration for comparison based on Expression 6 (Expression 5) The variation amount Nb of the final axial load measurement value WX due to the vibration force noise a · sin (ω · t) is equal to the vibration force noise a · sin (ω · t) applied to each of the left and right wheel load gauges SL and SR. Since the phases t are the same (t = t0), it becomes the sum (twice) of the standard deviation σ of the variation amount nb of the vibration force noise a · sin (ω · t). Nb = 4 · α.

<< Formula 7 >>
Nb = 2 · (2 · α) = 4 · α

  Taking this into consideration, when attention is paid to the present embodiment again, the axial load final measurement value WX based on the above-described formula 4 in the present embodiment is expressed as the following formula 8. In Equation 8, t1 is the acquisition timing of the left and right wheel weight measured values W1L and W1R by the left and right wheel weight meters S1L and S1R at the first measurement position P1, and t2 is the left and right of the second measurement position P2. It is the acquisition timing t of the left and right wheel load measured values W2L and W2R by the wheel load meters S2L and S2R, and t3 is the left and right wheel load measured values W3L by the left and right wheel load meters S3L and S3R at the third measurement position P3. This is the acquisition timing t of W3R.

<< Formula 8 >>
WX = [{wL + a · sin (ω · t1)} + {wR + a · sin (ω · t1)} + {wL + a · sin (ω · t2)} + {wR + a · sin (ω · t2)} + {wL + a · sin (ω · t3)} + {wR + a · sin (ω · t3)}] / 3
= (WL + wR) + {2 · a · sin (ω · t1) + 2 · a · sin (ω · t2) + 2 · a · sin (ω · t3)} / 3
１ W1L = wL + a · sin (ω · t1)
W1R = wR + a · sin (ω · t1)
W2L = wL + a · sin (ω · t2)
W2R = wR + a · sin (ω · t2)
W3L = wL + a · sin (ω · t3)
W3R = wR + a · sin (ω · t3)

  Then, the variation amount Nb due to the vibration force noise a · sin (ω · t) of the axial load final measurement value WX in the present embodiment based on the equation 8 (equation 4) is expressed by the first to third measurement positions P1, Since the phase t of the vibration force noise a · sin (ω · t) in P2 and P3 is different from each other (t = t1, t = t2 and t = t3), Nb≈2.309 · α.

<< Formula 9 >>
Nb = [{2 · (2 · α)} ² + {2 · (2 · α)} ² + {2 · (2 · α)} ² ] ^1/2 / 3
≒ 2.309 ・ α

  As is clear from the comparison between this formula 9 and the above-described formula 7, according to the comparative configuration in which only the pair of left and right wheel weight scales SL and SR are provided, the vibration force of the axial load final measurement value WX The variation amount Nb due to the noise a · sin (ω · t) is Nb = 4 · α, but according to the present embodiment, the variation amount Nb is a sufficiently small value of Nb = 2.309 · α. Can be suppressed. That is, in the present embodiment, the vibration force noise a · sin is determined for each of the axial weight measurement values W1X, W2X, and W3X obtained at the first to third measurement positions P1, P2, and P3 different from each other. Although the variation amount Nb due to (ω · t) is Nb = 4 · α, the average value of these axle load measurement values W1X, W2X and W3X is set as the axle load final measurement value WX, so that the axle load final value It means that the amount of variation Nb due to the vibration force noise a · sin (ω · t) of the measured value WX is suppressed to Nb≈2.309 · α. As a result of this suppression effect, accurate axial load measurement is realized as described above.

  By the way, the wheel scales S1L, S2L, S3L, S1R, S2R and S3R (especially the load sensors 22b, 22b,... And 24b, 24b,...) In the present embodiment are described above due to various factors such as deterioration over time. Abnormalities such as a span error or failure may occur. Therefore, in the present embodiment, in parallel with the axial load measurement, an abnormality diagnosis is performed to determine whether or not an abnormality has occurred in any of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R. When an abnormality occurs, a function of continuously determining the axial load measurement is provided, that is, determining the final axial load measurement value WX in a manner corresponding to the state of the abnormality.

  In order to realize this function, in the present embodiment, six shift registers SR1L, SR2L, SR3L, SR1R, SR2R and SR3R as shown in FIG. These shift registers SR1L, SR2L, SR3L, SR1R, SR2R, and SR3R correspond to the respective wheel load gauges S1L, S2L, S3L, S1R, S2R, and S3R, and each wheel load for M (M: natural number) axis. Measured values W1L [1] to W1L [M], W2L [1] to W2L [M], W3L [1] to W3L [M], W1R [1] to W1R [M], W2R [1] to W2R [M ] And W3R [1] to W3R [M] are stored. For example, when attention is paid to the shift register SR1L corresponding to the left wheel load meter S1L at the first measurement position P1, a new left wheel load measurement value W1L is stored in each storage area of the shift register SR1L by the left wheel load meter S1L. Each time it is acquired, the left wheel load measurement value W1L is stored in a first-in first-out (FIFO) system from the left side to the right side in FIG. That is, the latest left wheel load measurement value W1L [1] is stored in the leftmost storage area of each storage area of the shift register SR1L, and the oldest left wheel load measurement is stored in the rightmost storage area. The value W1L [M] is stored. The same applies to the other shift registers SR2L, SR3L, SR1R, SR2R and SR3R. The wheel load measurement values W1L [1] to W1L [M], W2L [1] to W2L [M], W3L [1] stored in the shift registers SR1L, SR2L, SR3L, SR1R, SR2R, and SR3R. ˜W3L [M], W1R [1] to W1R [M], W2R [1] to W2R [M] and W3R [1] to W3R [M] are associated with each other corresponding to each axle m. . And these wheel load measured values W1L [1] to W1L [M], W2L [1] to W2L [M], W3L [1] to W3L [M], W1R [1] to W1R [M], W2R [ 1] to W2R [M] and W3R [1] to W3R [M] are used for abnormality diagnosis. Incidentally, in the calculation of the axial load final measurement value WX based on the equation 4 including the above equations 1 to 3, the latest wheels stored in the shift registers SR1L, SR2L, SR3L, SR1R, SR2R, and SR3R. The multiple measured values W1L [1], W2L [1], W3L [1], W1R [1], W2R [1] and W3R [1] are applied.

  For example, no abnormality has occurred in any of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R, that is, all of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R Suppose that it is normal. In this case, the left wheel load measurement values W1L [1] to W1L [M], W2L [1] stored in the shift registers SR1L, SR2L, SR3L corresponding to the left wheel load gauges S1L, S2L and S3L, respectively. Based on ˜W2L [M], W3L [1] ˜W3L [M], strictly speaking, each latest N including the latest left wheel load measurement values W1L [1], W2L [1] and W3L [1]. (N: natural number satisfying N <M) Based on left wheel load measurement values W1L [1] to W1L [N], W2L [1] to W2L [N] and W3L [1] to W3L [N] for the axis. Thus, abnormality diagnosis is performed for each of the left wheel scales S1L, S2L, and S3L. Specifically, first, the average value of the left wheel load measurement values W1L [1] to W1L [N], W2L [1] to W2L [N] and W3L [1] to W3L [N] for each N axis. W1LA, W2LA, and W3LA are obtained by the following equations 10, 11, and 12.

<< Formula 10 >>
W1LA = ΣW1L [n] / N where n = 1 to N

<< Formula 11 >>
W2LA = ΣW2L [n] / N where n = 1 to N

<< Formula 12 >>
W3LA = ΣW3L [n] / N where n = 1 to N

  Each of these average values W1LA, W2LA, and W3LA is a measurement result for the same target (the left wheel load wL for the N-axis). For example, when all the left wheel load gauges S1L, S2L, and S3L are normal, Except for the influence of the vibration force described above, the values are the same (ideally, ideally). On the other hand, when an abnormality occurs in any of the left wheel weight gauges S1L, S2L, and S3L, the average value W1LA, W2LA, or W3LA corresponding to the left wheel weight gauge S1L, S2L, or S3L where the abnormality has occurred becomes an abnormal value. That is, the average values W1LA, W2LA, and W3LA are not uniform. Therefore, it is possible to determine whether or not an abnormality has occurred in any one of the left wheel weight gauges S1L, S2L, and S3L from the mutual comparison of the average values W1LA, W2LA, and W3LA. In some cases, it is possible to determine in which of the left wheel weight scales S1L, S2L, and S3L the abnormality has occurred. For this determination, mutual differences E12L, E23L, and E31L of these average values W1LA, W2LA, and W3LA are obtained based on the following equations 13, 14, and 15.

<< Formula 13 >>
E12L = | W1LA-W2LA |

<< Formula 14 >>
E23L = | W2LA-W3LA |

<< Formula 15 >>
E31L = | W3LA-W1LA |

  Then, each of these mutual differences E12L, E23L, and E31L is compared with a preset allowable value WE. Here, for example, when the mutual differences E12L, E23L, and E31L are all equal to or less than the allowable value WE (E12L ≦ WE, E23L ≦ WE and E31L ≦ WE), any of the left wheel load gauges S1L, S2L, and S3L It is also determined that no abnormality has occurred, that is, all the left side weight gauges S1L, S2L and S3L are normal. Of the mutual differences E12L, E23L, and E31L, each of the two mutual differences E12L and E31L related to the left wheel scale S1L at the first measurement position P1 is larger than the allowable value WE (E12L> WE and E31L> WE). ), And when the other difference E23L unrelated to the left wheel load gauge S1L at the first measurement position P1 is equal to or less than the allowable value WE (E23L ≦ WE), the left wheel load at the first measurement position P1. It is determined that an abnormality has occurred in the total S1L. Further, each of the two mutual differences E12L and E23L related to the left wheel scale S2L at the second measurement position P2 is larger than the allowable value WE (E12L> WE and E23L> WE), and the second measurement position P2 When the other difference E31L irrelevant to the left weight meter S2L is equal to or less than the allowable value WE (E31L ≦ WE), it is determined that an abnormality has occurred in the left wheel weight meter S2L at the second measurement position P2. Is made. Further, each of the two mutual differences E23L and E31L related to the left wheel load gauge S3L at the third measurement position P3 is larger than the allowable value WE (E23L> WE and E31L> WE), and the third measurement position P3. When the other difference E12L irrelevant to the left weight meter S3L is equal to or smaller than the allowable value WE (E12L ≦ WE), it is determined that an abnormality has occurred in the left weight meter S3L at the third measurement position P3. Is made. In this manner, abnormality diagnosis is performed for each of the left wheel load scales S1L, S2L, and S3L, and accurate abnormality diagnosis that is not easily affected by the vibration force described above is realized.

  Note that the value of N described above can be arbitrarily changed by an operation by the operation unit 38. As the value of N increases, the influence of vibration force is suppressed, that is, the accuracy of abnormality diagnosis is improved. On the other hand, the period from when an abnormality occurs until the abnormality is detected becomes longer. Decreases. On the other hand, as the value of N is smaller, the responsiveness of abnormality diagnosis is improved. On the other hand, the accuracy of abnormality diagnosis is lowered. In consideration of these trade-offs, the value of N is appropriately set. Further, the above-described allowable value WE can be arbitrarily changed by an operation by the operation unit 38. Incidentally, the larger the allowable value WE, the less affected by the vibration force, and on the other hand, it is difficult to detect an abnormality, so that the sensitivity of abnormality diagnosis is reduced. On the other hand, as the allowable value WE is smaller, the sensitivity of abnormality diagnosis is improved. On the other hand, the tolerance WE is more easily influenced by vibration force. In consideration of these balances, the allowable value WE is also set appropriately.

  In the same manner as this, abnormality diagnosis is also performed for each of the right wheel weight scales S1R, S2R, and S3R. However, detailed description thereof is omitted.

  The abnormality diagnosis for each wheel weight meter S1L, S2L, S3L, S1R, S2R and S3R according to such a procedure is performed by, for example, the latest wheel weight measurement values W1L [1], W2L [1], W3L [1], W1R. Each time [1], W2R [1] and W3R [1] are obtained, that is, the latest wheel weight measured values W3L [1] and W3R [1 by the left and right wheel weight gauges S3L and S3R at the third measurement position P3. ] Is obtained each time.

  If it is determined by the abnormality diagnosis that an abnormality has occurred in any of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R, an alarm indicating that fact is output, and a predetermined message is displayed on the display unit 40, for example. Is displayed. This message may include abnormal anomaly meter information (for example, an identification code or an arrangement position) indicating which of the anomalies has occurred in each of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R. . In addition, a simulation diagram simulating the appearance (particularly a plan view) of the weighing unit 30 including the respective wheel scales S1L, S2L, S3L, S1R, S2R, and S3R is displayed on the display unit 40. The state (mode) of the abnormality, such as which of the weighing scales S1L, S2L, S3L, S1R, S2R, and S3R has occurred, may be expressed.

  Here, for example, as shown in FIG. 5, it is assumed that an abnormality has occurred in the left wheel scale S2L at the second measurement position P2. In this case, the left wheel weight meter S2L (according to the left wheel weight measurement value W2L) at the second measurement position P2 where the abnormality has occurred is invalidated. Only the other normal wheel load gauges S1L, S3L, S1R, S2R, and S3R (by the wheel load measurement values W1L, W3L, W1R, W2R, and W3R) are validated, and each validated each Using only the wheel load gauges S1L, S3L, S1R, S2R and S3R (by the wheel load measurement values W1L, W3L, W1R, W2R and W3R), that is, the left wheel load gauge S2L at the second measurement position P2 invalidated. The axle load measurement is performed by excluding the above, so that the axle load measurement is temporarily continued. Specifically, the axial load final measurement value WX is obtained based on the following equation (16). The obtained axial load final measurement value WX is displayed on the display unit 40, and is displayed in such a manner that, in particular, it can be seen that it is obtained by provisional axial load measurement. Further, the axial load final measurement value WX is stored in the above-described memory, and is output to the above-described external device as necessary.

<< Formula 16 >>
WX = (W1L + W3L) / 2 + (W1R + W2R + W3R) / 3

  The equation 16 is expressed as the following equation 17 following the above equation 8.

<Equation 17>
WX = [{wL + a · sin (ω · t1)} + {wL + a · sin (ω · t3)}] / 2 + [{wR + a · sin (ω · t1)} + {wR + a · sin (ω · t2)} + {WR + a · sin (ω · t3)}] / 3
= (WL + wR) + (5/6) · a · sin (ω · t1) + (1/3) · a · sin (ω · t2) + (5/6) · a · sin (ω · t3)

  Then, the variation amount Nb representing the influence of the vibration force of the axial load final measurement value WX based on the equation 17 (equation 16) is Nb≈2.450 · α as in the following equation 18.

<< Formula 18 >>
Nb = [{(5/6) · (2 · α)} ² + {(1/3) · (2 · α)} ² + {(5/6) · (2 · α)} ² ] ^{1 / 2}
≒ 2.450 ・ α

  The variation amount Nb of Nb≈2.450 · α is the variation amount Nb≈2.309 · α when all the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R are normal (see Equation 9). Although slightly larger than the above, the variation amount Nb = 4 · α (see Equation 7) according to the above-described comparative configuration is sufficiently smaller. In short, according to the calculation of the final axial load measurement value WX based on the equation 16 (Equation 17), the final axial load measurement value WX in which the influence of the vibration force is sufficiently suppressed can be obtained.

  Instead of calculating the final axle load measurement value WX based on the equation 16, the final axle load measurement value WX may be obtained by the following calculation.

  First, paying attention to the pair of left and right wheel weights S1L and S1R at the normal first measurement position P1, both the pair of left and right wheel weight gauges 22 and 24 measure each wheel weight by each of these wheel weight meters S1L and S1R. A mutual difference W1D between the values W1L and W1R is obtained as in the following Expression 19.

<Formula 19>
W1D = W1L-W1R

  Incidentally, the mutual difference W1D based on the equation 19 is expressed as the following equation 20.

<< Formula 20 >>
W1D = {wL + a · sin (ω · t1)} − {wR + a · sin (ω · t1)}
= WL-wR

  As can be seen from the equation 20, the mutual difference W1D based on the equation 20 (equation 19) is the true mutual difference between the true left-side axle load wL and the true right-side axle load wR in which the influence of the vibration force is eliminated. (= WL-wR). Therefore, the wheel load measurement value W2X at the second measurement position P2 can be obtained by the following equation 21 including the mutual difference W1D. That is, the wheel load measurement value W2X at the second measurement position P2 can be obtained (ie, estimated) without using the left wheel weight meter S2L at the second measurement position P2 where the abnormality has occurred.

<< Formula 21 >>
W2X = 2 ・ W2R + W1D
= 2 · {wR + a · sin (ω · t2)} + (wL−wR)
= {WL + a · sin (ω · t2)} + {wR + a · sin (ω · t2)}
= W2L + W2R

  Then, the axial load final measurement value WX can be obtained based on the following equation 22 that conforms to the above-described equation 4.

<< Formula 22 >>
WX = (W1X + W2X + W3X) / 3
{(W1L + W1R) + (2.W2R + W1D) + (W3L + W3R)} / 3

  Similarly, paying attention to the pair of left and right wheel weights S3L and S3R at the third measurement position P3 in which both the pair of left and right wheel weights 22 and 24 are normal, A mutual difference W3D between the respective wheel load measurement values W3L and W3R is obtained by the following equation (23).

<< Formula 23 >>
W3D = W3L-W3R

  The mutual difference W1D based on the equation 23 is expressed as the following equation 24.

<< Formula 24 >>
W3D = {wL + a · sin (ω · t3)} − {wR + a · sin (ω · t3)}
= WL-wR

  As can be seen from the equation 24, the mutual difference W3D based on the equation 24 (equation 23) is also the true mutual difference between the true left axle weight wL and the true right axle weight wR from which the influence of the vibration force is eliminated. It is. Accordingly, the wheel load measurement value W2X at the second measurement position P2 can be obtained by using the following equation 25 including the mutual difference W3D without using the left wheel weight meter S2L at the second measurement position P2 where the abnormality has occurred. it can.

<< Formula 25 >>
W2X = 2 ・ W2R + W3D
= 2 · {wR + a · sin (ω · t2)} + (wL−wR)
= W2L + W2R

  Then, the axial load final measurement value WX can be obtained based on the following equation 26 similar to the equation 22 described above.

<< Formula 26 >>
WX = (W1X + W2X + W3X) / 3
{(W1L + W1R) + (2.W2R + W3D) + (W3L + W3R)} / 3

  Therefore, an average mutual difference WD, which is an average of the mutual difference W1D based on the above-described formula 19 (formula 20) and the mutual difference W3D based on the formula 23 (formula 24), is obtained as in the following formula 27. This average mutual difference WD is a value in which the influence of various noises (particularly minute random noise) other than the vibration force is suppressed.

<< Formula 27 >>
WD = (W1D + W3D) / 2
= WL-wR

  The wheel load measurement value W2X at the second measurement position P2 is obtained based on the following expression 28 based on the above-described expression 21 and expression 25.

<< Formula 28 >>
W2X = 2 ・ W2R + WD
= 2 · {wR + a · sin (ω · t2)} + (wL−wR)
= W2L + W2R

  Furthermore, the axial load final measurement value WX is obtained based on the following equation 29 similar to the above-described equation 22 and equation 26.

<< Formula 29 >>
WX = (W1X + W2X + W3X) / 3
{(W1L + W1R) + (2.W2R + WD) + (W3L + W3R)} / 3

  The axial load final measurement value WX based on the equation 29 is expressed as the following equation 30.

<< Formula 30 >>
WX = [{wL + a · sin (ω · t1)} + {wR + a · sin (ω · t1)} + 2 · {wR + a · sin (ω · t2)} + (wL−wR) + {wL + a · sin (ω · t3)} + {wR + a · sin (ω · t3)}] / 3
= (WL + wR) + {2 · a · sin (ω · t1) + 2 · a · sin (ω · t2) + 2 · a · sin (ω · t3)} / 3

  As can be seen from Equation 30, the final axle load measurement value WX based on Equation 30 (Equation 29) results when all wheel load gauges S1L, S2L, S3L, S1R, S2R and S3R are normal. This is the same as the wheel load final measurement value WX based on the above-described Expression 8 (Expression 4). Therefore, the variation amount Nb due to the above-described vibration force noise a · sin (ω · t) of the axial load final measurement value WX based on the equation 29 is determined by all wheel load gauges S1L, S2L, S3L, S1R, S2R, and S3R. Nb = 2.309 · α (see Equation 9), which is the same as when normal. That is, according to the calculation based on Equation 29, the same effect as that obtained when all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal can be obtained with respect to the influence of the vibration force. . In view of this, in order to obtain a more accurate axial load final measurement value WX, the calculation based on Expression 29 is more preferable than the calculation based on Expression 16 described above.

  It should be noted that even if an abnormality occurs in any one of the wheel weight gauges S1L, S3L, S1R, S2R or S3R other than the left wheel weight gauge S2L at the second measurement position P2, the left wheel weight at the second measurement position P2 is also detected. The axial load final measurement value WX is obtained in the same manner as when an abnormality has occurred in the total S2L.

  Further, in the present embodiment, even when this temporary axle load measurement is performed, that is, when an abnormality occurs in the left wheel load gauge S2L at the second measurement position P2, for example, as shown in FIG. In addition, abnormality diagnosis is performed for each of the effective (normal) wheel scales S1L, S3L, S1R, S2R, and S3R used for the provisional axle load measurement.

  Specifically, abnormality diagnosis is performed in the same manner as described above for each of the right wheel load gauges S1R, S3L, S1R, S2R, and S3R. On the other hand, for each of the wheel scales S1L and S3L on the left side, since the abnormality diagnosis according to the above-described procedure is impossible, the abnormality diagnosis is performed according to another procedure.

  First, a comparison is made between the mutual difference E31L (= | W3LA−W1LA |) based on the above-described equation 15 relating to both the left-side wheel load gauges S1L and S3L to be diagnosed and the above-described allowable value WE. The Here, for example, when the mutual difference E31L is equal to or less than the allowable value WE (E31 ≦ WE), it is determined that each of the left wheel weight gauges S1L and S3L is normal. On the other hand, when the mutual difference E31L is larger than the allowable value WE (E31> WE), it is determined that an abnormality has occurred in any one of the left wheel load gauges S1L and S3L. However, at this time, it is unclear which of the left wheel weight scales S1L and S3L has an abnormality. Therefore, an abnormality occurs in each of the left-side wheel load gauges S1L and S3L using the wheel weight measurement values W1R, W2R, and W3R of the other wheel load gauges S1R, S2R, and S3R on the other side. A determination is made as to whether or not

  Therefore, for each M-axis (that is, all) stored in each of the shift registers SR1L (see FIG. 4A) and SR3L (see FIG. 4C) corresponding to the left wheel load gauges S1L and S3L. ) Of the left wheel load measurement values W1L [1] to W1L [M] and W3L [1] to W3L [M], respectively, are obtained as shown in the following Expression 31 and Expression 32.

<< Formula 31 >>
W1LA ′ = ΣW1L [m] / M where m = 1 to M

<< Formula 32 >>
W3LA ′ = ΣW3L [m] / M where m = 1 to M

  In addition, the shift registers SR1R (see FIG. 4 (d)) and SR3R (see FIG. 4 (f)) corresponding to the right wheel scales S1R and S3R paired with the left wheel scales S1L and S3L are stored. The average values W1RA ′ and W3RA ′ of the right wheel load measurement values W1R [1] to W1R [M] and W3R [1] to W3R [M] for each M-axis are expressed by the following equations 33 and 34, respectively. It is demanded as follows.

<< Formula 33 >>
W1RA ′ = ΣW1R [m] / M where m = 1 to M

<< Formula 34 >>
W3RA ′ = ΣW3R [m] / M where m = 1 to M

  Here, for example, when attention is paid to the respective average values W1LA ′ and W1RA ′ corresponding to the left and right wheel scales S1L and S1R at the first measurement position P1, each of the average values W1LA ′ and W1RA ′ includes a plurality of axles called M-axis. The left and right wheel weight measurements W1L [1] to W1L [M] and W1R [1] to W1R [M] are averages of the minute, so that there is a slight difference between the left and right wheel weights wL and wR of the individual axle m. Even if there is a difference, they are substantially equivalent to each other. Therefore, when an abnormality occurs in any one of the left wheel load gauges S1L and S3L as described above, from the mutual comparison of the average values W1LA ′ and W1RA ′, the left wheel load gauges S1L and S3L It can be determined whether or not an abnormality has occurred in at least the left wheel scale S1L at the first measurement position P1. For this purpose, a mutual difference E1LR ′ between the average values W1LA ′ and W1RA ′ is obtained based on the following Expression 35.

<< Formula 35 >>
E1LR ′ = | W1LA′−W1RA ′ |

  Then, the average value E1LR ′ based on the equation 35 is compared with a preset allowable value WE ′. As a result, when the average value E1LR ′ is equal to or less than the allowable value WE ′ (E1LR ′ ≦ WE ′), it is determined that the left wheel scale S1L at the first measurement position P1 is normal. On the other hand, when the average value E1LR ′ is larger than the allowable value WE ′ (E1LR ′> WE ′), it is determined that an abnormality has occurred in the left wheel scale S1L at the first measurement position P1. Is done.

  Similarly, the mutual difference E3LR ′ between the average values W3LA ′ and W3RA ′ corresponding to the left and right wheel scales S3L and S3R at the third measurement position P3 is obtained based on the following Expression 36.

<< Formula 36 >>
E3LR ′ = | W3LA′−W3RA ′ |

  Then, the average value E3LR ′ based on the expression 36 is also compared with the above-described allowable value WE ′. As a result, when the average value E3LR ′ is equal to or less than the allowable value WE ′ (E3LR ′ ≦ WE ′), it is determined that the left wheel scale S3L at the third measurement position P3 is normal. On the other hand, if the average value E3LR ′ is larger than the allowable value WE ′ (E3LR ′> WE ′), it is determined that an abnormality has occurred in the left wheel scale S3L at the third measurement position P3. Is done.

  It should be noted that the abnormality diagnosis for the left weighing scale S1L at the first measurement position P1 corresponds to the right weighing scale S2R at the second measurement position P2 based on the following expression 37 based on the above-described Expression 33 and Expression 34. The average value W2RA ′ to be obtained is obtained. From the mutual comparison between the average value W2RA ′ based on the equation 37 and the average value W1LA ′ based on the above-described equation 31 corresponding to the left wheel scale S1L at the first measurement position P1. In addition, an abnormality diagnosis can be performed for the left wheel scale S1L at the first measurement position P1.

<< Formula 37 >>
W2RA ′ = ΣW2R [m] / M where m = 1 to M

  However, the average value W2RA ′ based on the expression 37 and the average value W1LA ′ based on the expression 31 described above are the left wheel load measurements obtained at different positions, ie, the first measurement position P1 and the second measurement position P2. Since it is based on the values W1L and W2L, it is somewhat affected by the vibration force described above. Accordingly, regarding the abnormality diagnosis for the left wheel scale S1L at the first measurement position P1, as described above, the average value W1LA ′ based on the equation 31 corresponding to the left wheel scale S1L at the first measurement position P1, and the first It is desirable that this is carried out by mutual comparison with an average value W1RA ′ based on the equation 33 corresponding to the right wheel weight meter S1R of the first measurement position P1 paired with the left wheel weight meter S1L of the one measurement position P1. The same applies to the abnormality diagnosis for the left wheel scale S3L at the third measurement position P3.

  In addition, for example, the average value W1LA ′ based on the formula 31 corresponding to the left wheel scale S1L at the first measurement position P1 is called M-axis (more than the N-axis) compared to the average value W1LA based on the formula 10 described above. Since this is the average of the left wheel load measurement values W1L [1] to W1L [M] for the axles, the influence of the vibration force is further suppressed. The same applies to the average value W1RA 'based on the equation 33 corresponding to the right wheel weight meter W1R at the first measurement position P1 that forms a pair with the left wheel weight meter S1L at the first measurement position P1. Accordingly, the abnormality diagnosis for the left wheel scale S1L at the first measurement position P1 is performed from the mutual comparison of the average values W1LA 'and W1RA', thereby realizing a more accurate abnormality diagnosis. The average value W1LA based on Expression 10 and the average value W11RA (= ΣW1R [n] / N) corresponding to the right wheel weight meter W1R at the first measurement position P1 based on Expression 10 are compared with each other. An abnormality diagnosis for the left wheel weight meter S1L at one measurement position P1 may be performed. However, in this case, the influence of the vibration force is somewhat increased. The same applies to the abnormality diagnosis for the left wheel scale S3L at the third measurement position P2. Further, the allowable value WE ′ referred to here can be arbitrarily changed by an operation by the operation unit 38.

  For example, if the abnormality diagnosis reveals that an abnormality has occurred in any of the effective wheel scales S1L, S3L, S1R, S2R, and S3R, an alarm indicating that fact is output. In this case, if no new abnormality has occurred, provisional axle load measurement according to the above-described procedure is continued as it is.

  Here, for example, as shown in FIG. 6, a new abnormality has occurred in the left wheel weight meter S1L at the first measurement position P1, that is, the left wheel weight meter S2L at the second measurement position P2 where the abnormality has occurred first is combined. It is assumed that an abnormality has occurred in the two left-hand side weight gauges S1L and S2L. Also in this case, tentative continuation of the axle load measurement is attempted except for the left wheel weight gauges S1L and S2L in which an abnormality has occurred. Specifically, for example, it is assumed that the axial load final measurement value WX is obtained based on the following equation 38.

<< Formula 38 >>
WX = W3L + (W1R + W2R + W3R) / 3

  The equation 16 is expressed as the following equation 39.

<< Formula 39 >>
WX = {wL + a · sin (ω · t3)} + [{wR + a · sin (ω · t1)} + {wR + a · sin (ω · t2)} + {wR + a · sin (ω · t3)}] / 3
= (WL + wR) + (1/3) · a · sin (ω · t1) + (1/3) · a · sin (ω · t2) + (4/3) · a · sin (ω · t3)

  Then, the variation amount Nb representing the influence of the vibration force of the axial load final measurement value WX based on the equation 39 (equation 38) is Nb≈2.828 · α as in the following equation 40.

<< Formula 40 >>
Nb = [{(1/3) · (2 · α)} ² + {(1/3) · (2 · α)} ² + {(4/3) · (2 · α)} ² ] ^{1 / 2}
≒ 2.828 ・ α

  The variation amount Nb of Nb≈2.828 · α is the variation amount Nb≈2.309 · α when all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal (see Equation 9). Therefore, it seems that the calculation based on Expression 38 (Expression 39) cannot sufficiently suppress the influence of the vibration force. Therefore, the following calculation is adopted.

  That is, paying attention to the pair of left and right wheel weights S3L and S3R at the third measurement position P3 in which both the pair of left and right wheel weights 22 and 24 are normal, each wheel weight measurement by these wheel weight meters S3L and S3R is performed. A mutual difference W3D between the values W3L and W3R is obtained based on the above-described Expression 23. Then, based on the following equation 41 based on the above equation 25, the axial load measurement value W1X at the first measurement position P1 is obtained.

<< Formula 41 >>
W1X = 2 ・ W1R + W3D
= 2 · {wR + a · sin (ω · t1)} + (wL−wR)
= W1L + W1R

  In addition, the axial load measurement value W2X in the second measurement value P2 is obtained based on the above-described Expression 25. After that, the axial load final measurement value WX is obtained based on the following equation 42 similar to the equation 26 described above.

<< Formula 42 >>
WX = (W1X + W2X + W3X) / 3
= {(2.W1R + W3D) + (2.W2R + W3D) + (W3L + W3R)} / 3

  The axial load final measurement value WX based on the equation 42 is expressed as the following equation 43.

<< Formula 43 >>
WX = [2 · {wR + a · sin (ω · t1)} + (wL−wR) + 2 · {wR + a · sin (ω · t2)} + (wL−wR) + {wL + a · sin (ω · t3)} + {WR + a · sin (ω · t3)}] / 3
= (WL + wR) + {2 · a · sin (ω · t1) + 2 · a · sin (ω · t2) + 2 · a · sin (ω · t3)} / 3

  As can be seen from the equation 43, the axial load final measured value WX based on the equation 43 (equation 42) results when all the wheel load gauges S1L, S2L, S3L, S1R, S2R and S3R are normal. This is the same as the wheel load final measurement value WX based on the above-described Expression 8 (Expression 4). Therefore, the variation amount Nb due to the vibration force noise a · sin (ω · t) of the axial load final measurement value WX based on the equation 42 is normal in all wheel load gauges S1L, S2L, S3L, S1R, S2R, and S3R. Nb = 2.309 · α (see Equation 9), which is the same as when there is. That is, according to the calculation based on the equation 42, the same effect as that when all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal can be obtained with respect to the influence of the vibration force. . Therefore, the axial load final measurement value WX is obtained by the calculation based on the equation 42, that is, the temporary axial load measurement is continued. Then, the final axial weight measurement value WX obtained by the provisional axial weight measurement is displayed on the display unit 40, and is displayed in a manner that indicates that the temporary axial weight measurement is in particular. The axial load final measurement value WX is stored in the memory as described above, and is output to an external device (not shown) as necessary.

  It should be noted that not only the left weighing scale S2L at the first measurement position P1 but also the left weighing scale S3L at the third measurement position P3 has an abnormality, that is, each of the second measurement position P2 and the third measurement position P3. Even when an abnormality occurs in the left wheel load gauges S2L and S3L, the final axle load measurement value WX is obtained in the same manner. Also, when all the wheel scales S1L, S2L and S3L on the left side are normal and abnormality occurs in two of the right wheel scales S1R, S2R and S3R, the axle load is also similar in the same manner. A final measurement value WX is determined. Furthermore, both the left and right wheel weight scales 22 and 24 are normal at any one of the first to third measurement positions P1, P2, and P3, and the left wheel weight scale 22 is abnormal at the other one position. In the case where an abnormality occurs in the right wheel weight meter 24 at another one location, the axial load final measurement value WX is obtained in the same manner. In short, both the left and right wheel weight gauges 22 and 24 are normal at any one of the first to third measurement positions P1, P2 and P3, and the left and right wheel weights are respectively measured at the remaining two positions. Even when an abnormality occurs in one of the totals 22 and 24, provisional axle load measurement is performed in the same manner.

  Even when provisional axle load measurement is performed in this state, that is, as shown in FIG. 6, for example, as shown in FIG. 6, the two left wheel load gauges S1L and S2L at the first measurement position P1 and the second measurement position P2. Even when an abnormality occurs, abnormality diagnosis is performed for each of the effective wheel load gauges S3L, S1R, S2R, and S3R used for the provisional axle load measurement.

  Specifically, abnormality diagnosis is performed in the same manner as described above for each of the right wheel weight scales S1R, S2R, and S3R among the valid wheel weight scales S3L, S1R, S2R, and S3R. On the other hand, for the normal wheel scale S3L on the left side, abnormality diagnosis is performed in the following manner.

  That is, the average value W3LA ′ corresponding to the left wheel load scale S3L to be diagnosed is obtained based on the above equation 32. In addition, an average value W3RA ′ corresponding to the right wheel scale S3R at the third measurement position P3 that forms a pair with the left wheel scale S3L that is the diagnosis target is obtained based on the above-described Expression 34. Then, a mutual difference E3LR ′ between these average values W3LA ′ and W3RA ′ is obtained based on the above-described Expression 36.

  In addition, an average value W1RA ′ corresponding to one of the other right wheel weight scales S1L and S2L, for example, the right wheel weight scale S1L at the first measurement position P1, is obtained based on the above-described Expression 33. Then, the difference E31LR ′ between the average value W1RA ′ based on the equation 33 and the average value S3LA ′ based on the equation 32 corresponding to the left wheel weight meter S3L to be diagnosed is based on the equation 36 described above. The following equation 44 is obtained.

<< Formula 44 >>
E31LR ′ = | W3LA′−W1RA ′ |

  Then, each of the mutual difference E31LR ′ based on the equation 44 and the mutual difference E3LR ′ based on the equation 36 is compared with the allowable value WE ′ described above. In this comparison, for example, when both of these mutual differences E3LR ′ and E31LR ′ are both greater than the allowable value WE ′ (E3LR ′> WE, E31LR ′> WE), the left wheel load meter S3L to be diagnosed It is determined that an abnormality has occurred. Incidentally, when both of these mutual differences E3LR ′ and E31LR ′ are both less than or equal to the allowable value WE ′ (E3LR ′ ≦ WE, E31LR ′ ≦ WE), at least the left wheel scale S3L to be diagnosed It will be normal. Further, one of the mutual differences E3LR ′ and E31LR ′, for example, the mutual difference E3LR ′ based on Expression 36 is larger than the allowable value WE ′ (E3LR ′> WE ′), and the other, that is, based on Expression 44. When the mutual difference E31LR ′ is equal to or smaller than the allowable value WE ′ (E31LR ′ ≦ WE ′), it means that an abnormality has occurred in the right wheel scale S3R at the third measurement position P3. The mutual difference E3LR ′ based on Expression 36 is equal to or less than the allowable value WE ′ (E3LR ′ ≦ WE ′), and the mutual difference E31LR ′ based on Expression 44 is larger than the allowable value WE ′ (E31LR ′> WE ′). ), An abnormality has occurred in the right wheel load gauge S1R at the first measurement position P1. Instead of the formula 44, the average value W2RA ′ based on the above formula 37 corresponding to the right wheel weight S2R at the second measurement position P2 and the above formula 32 corresponding to the left wheel scale S3L to be diagnosed. The following equation 45 for obtaining the difference E32LR ′ between the average value W3LA ′ based on the above may be adopted.

<< Formula 45 >>
E32LR ′ = | W3LA′−W2RA ′ |

  For example, when the abnormality diagnosis reveals that an abnormality has occurred in any of the effective wheel scales S3L, S1R, S2R, and S3R, an alarm indicating that fact is output. If no new abnormality has occurred, provisional axle load measurement is continued in the same manner as before.

  Here, for example, as shown in FIG. 7, each of the first measurement position P1 and the second measurement position P2 in which a new abnormality has occurred in the left wheel scale S3L at the third measurement position P3, that is, the abnormality has occurred first. It is assumed that an abnormality has occurred in all the left wheel weight gauges S1L, S2L and S3L in the first to third measurement positions P1, P2 and P3 together with the left wheel weight gauges S1L and S2L. In this case, since the left wheel load wL cannot be measured, it is naturally impossible to obtain an accurate axial load final measurement value WX. Accordingly, the axial load measurement is immediately stopped. In addition, as the above-described alarm, the alarm including information indicating that the axle load measurement is impossible, information prompting prompt repair, and the like are output.

  The same applies to the case where an abnormality occurs in all the right wheel weight gauges S1R, S2R, and S3R at the first to third measurement positions P1, P2, and P3. That is, abnormality occurs in all the left wheel weight gauges S1L, S2L, and S3L at the first to third measurement positions P1, P2, and P3, or the first to third measurement positions P1, P2 are detected. If all the right wheel weights S1R, S2R, and S3R of P3 and P3 are abnormal, the axle load measurement is immediately stopped, information indicating that the axle load measurement is impossible, and prompt repairs. An alarm including information for prompting is output.

  Returning to FIG. 6, from the state shown in FIG. 6, for example, as shown in FIG. 8, an abnormality has occurred in the right wheel weight meter S1R at the first measurement position P1, that is, the left and right wheel weights at the first measurement position P1. It is assumed that an abnormality has occurred in both S1L and S1R in total. In this case, the left and right wheel loads wL and wR cannot be measured at the first measurement position P1, that is, the axle load measurement value W1X at the first measurement position P1 cannot be obtained. The final measured value WX cannot be obtained. For example, it is assumed that the final axial load measurement value WX is obtained based on the following equation 46.

<< Formula 46 >>
WX = W3L + (W2R + W3R) / 2

  This expression 46 is expressed as the following expression 47.

<< Formula 47 >>
WX = {wL + a · sin (ω · t3)} + [{wR + a · sin (ω · t2)} + {wR + a · sin (ω · t3)}] / 2
= (WL + wR) + (1/2) · a · sin (ω · t2) + (3/2) · a · sin (ω · t3)

  Then, the variation amount Nb representing the influence of the vibration force on the axial load final measurement value WX based on the equation 47 (equation 46) is Nb≈3.162 · α as in the following equation 48.

<< Formula 48 >>
Nb = [{(1/2) · (2 · α)} ² + {(3/2) · (2 · α)} ² ] ^1/2
≒ 3.162 ・ α

  The variation amount Nb of Nb≈3.162 · α is the variation amount Nb≈2.309 · α when all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal (see Equation 9). Considerably larger than. Therefore, the calculation based on Expression 46 (Expression 47) cannot sufficiently suppress the influence of the vibration force.

  As another calculation, for example, based on Equation 23 described above, the mutual difference W3D between the respective wheel weight measured values W3L and W3R by the left and right wheel weight meters S3L and S3R at the third measurement position P3 is obtained. It is assumed that the axial load measurement value W2X at the second measurement position P2 is obtained based on the above-described Expression 25 including the mutual difference W3D. In addition, it is assumed that the axial weight measurement value W3X at the third measurement position P3 is obtained based on the above-described Expression 3. Then, the final axial load measurement value WX is obtained by averaging the axial load measurement value W2X at the second measurement value P2 and the axial load measurement value W3X at the third measurement position P3, that is, based on the following equation 49. Suppose that

<< Formula 49 >>
WX = (W2X + W3X) / 2
= {(2.W2R + W3D) + (W3L + W3R)} / 2

  The axial load final measurement value WX based on the equation 49 is expressed as the following equation 50.

<< Formula 50 >>
WX = [2 · {wR + a · sin (ω · t2)} + (wL−wR) + {wL + a · sin (ω · t3)} + {wR + a · sin (ω · t3)}] / 2
= (WL + wR) + a · sin (ω · t2) + a · sin (ω · t3)

  Then, the variation amount Nb representing the influence of the vibration force on the axial load final measurement value WX based on the formula 50 (formula 49) is Nb≈2.828 · α as shown in the following formula 51.

<< Formula 51 >>
Nb = [(2 · α) ² + (2 · α) ² ] ^1/2
≒ 2.828 ・ α

  The variation amount Nb of Nb≈2.828 · α is also the variation amount Nb≈2.309 · α when all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal (see Equation 9). Bigger than). Therefore, even the calculation based on Expression 49 (Expression 50) cannot sufficiently suppress the influence of the vibration force.

  This is because, from the state shown in FIG. 6, when an abnormality occurs in the right wheel scale S2R at the second measurement position P2, that is, there is an abnormality in both the left and right wheel scales S2L and S2R at the second measurement position P2. The same applies when it occurs. The same applies when an abnormality occurs in both the left and right wheel scales S3L and S3R at the third measurement position P3. That is, when an abnormality occurs in both the left and right wheel weight gauges 22 and 24 at at least one of the first to third measurement positions P1, P2, and P3, accurate axial weight measurement can be performed. Can not. Accordingly, in this case as well, as in the state shown in FIG. 7, the axle load measurement is immediately stopped, information indicating that the axle load measurement is impossible, information prompting prompt repair, etc. Including alarm is output.

  Returning to FIG. 6 again, from the state shown in FIG. 6, for example, as shown in FIG. 9, an abnormality has occurred in the right weight scale S3R at the third measurement position P3, that is, the first measurement in which an abnormality has occurred first. It is assumed that an abnormality has occurred in the right wheel load gauge S3R at the third measurement position P3 in addition to the left wheel load gauges S1L and S2L at the position P1 and the second measurement position P2. Also in this case, tentative continuation of the axial load measurement is attempted with the exception of each wheel weight meter S1L, S2L, and S3R in which an abnormality has occurred. Specifically, for example, based on the following formula 52, the axial load final measurement value WX is obtained.

<< Formula 52 >>
WX = W3L + (W1R + W2R) / 2

  The equation 52 is expressed as the following equation 53.

<< Formula 53 >>
WX = {wL + a · sin (ω · t3)} + [{wR + a · sin (ω · t1)} + {wR + a · sin (ω · t2)}] / 2
= (WL + wR) + (1/2) · a · sin (ω · t1) + (1/2) · a · sin (ω · t2) + a · sin (ω · t3)

  Then, the variation amount Nb representing the influence of the vibration force on the axial load final measurement value WX based on the equation 53 (equation 52) is Nb≈2.449 · α as in the following equation 54.

<< Formula 54 >>
Nb = [{(1/2) · (2 · α)} ² + {(1/2) · (2 · α)} ² + (2 · α) ² ] ^1/2
≒ 2.449 ・ α

  The variation amount Nb of Nb≈2.499 · α is the variation amount Nb≈2.309 · α when all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal (see Equation 9). Although slightly larger than the above, the variation amount Nb = 4 · α (see Equation 7) according to the above-described comparative configuration is sufficiently smaller. That is, according to the calculation of the final axle load measurement value WX based on the equation 52 (Equation 53), the final axle load measurement value WX in which the influence of the vibration force is sufficiently suppressed can be obtained.

  Therefore, when in the state shown in FIG. 9, the axial load final measurement value WX is obtained based on the equation 52, that is, the provisional axial load measurement is continued. Then, the final axial weight measurement value WX obtained by the provisional axial weight measurement is displayed on the display unit 40, and is displayed in a manner that indicates that the temporary axial weight measurement is in particular. The axial load final measurement value WX is stored in the memory as described above, and is output to an external device (not shown) as necessary.

  In addition to the state shown in FIG. 9, for example, contrary to the state shown in FIG. 9, an abnormality occurs in each of the right hand weights S1R and S2R at the first measurement position P1 and the second measurement position P2, Even when an abnormality occurs in the left wheel weight meter S3L at the third measurement position P3, provisional axle load measurement is performed in the same manner. In short, at each of the first to third measurement positions P1, P2, and P3, an abnormality occurs in one of the left and right wheel weights 22 and 24. In other words, Either one is normal and at least one of all the left wheel weights 22, 22 and 22 is normal, and at least one of all the right wheel weights 24, 24 and 24 When is normal, the axle load is measured in the same manner.

  Even when provisional axle load measurement is performed in this state, that is, for example, as shown in FIG. 9, the left wheel load gauges S1L and S2L at the first measurement position P1 and the second measurement position P2 are abnormal. And when there is an abnormality in the right wheel load meter S3R at the third measurement position P3, each of the effective wheel load meters S3L, An abnormality diagnosis is performed for S1R and S2R.

  Specifically, the average values W3LA ′, W1RA ′ and W2RA ′ corresponding to the respective wheel scales S3L, S1R and S2R to be diagnosed are obtained based on the above-described equations 32, 33 and 37. Then, a mutual difference E31LR ′ between the average value W3LA ′ based on Expression 32 and the average value W1RA ′ based on Expression 33 is obtained based on the above Expression 44. In addition, the mutual difference E32LR ′ between the average value W3LA ′ based on Expression 32 and the average value W2RA ′ based on Expression 37 is obtained based on Expression 45 described above. Further, a mutual difference E12R between the average value W1RA ′ based on Expression 33 and the average value W2RA ′ based on Expression 37 is obtained based on the following Expression 55.

<Formula 55>
E12R ′ = | W1RA′−W2RA ′ |

  Then, each of the mutual differences E31LR ′, E32LR ′, and E12R ′ based on the equations 44, 45, and 55 is compared with the above-described allowable value WE ′. Here, for example, if each of the mutual differences E31LR ′, E32LR ′, and E12R ′ is equal to or less than the allowable value WE ′ (E31LR ′ ≦ WE ′, E32LR ′ ≦ WE ′ and E12R ′ ≦ WE ′), the diagnosis target It is determined that no abnormality has occurred in any of the wheel load gauges S3L, S1R and S2R, that is, all of the wheel load gauges S3L, S1R and S2R are normal. Of the mutual differences E12L, E23L, and E31L, each of the two mutual differences E31LR ′ and E32LR ′ related to the left wheel scale S3L at the third measurement position P3 is larger than the allowable value WE ′ (E31LR ′> WE). 'And E32LR'WE') and other mutual difference E12R 'irrelevant to the left wheel scale S3L at the third measurement position P3 is equal to or less than the allowable value WE' (E12R'≤WE ') It is determined that an abnormality has occurred in the left wheel scale S3L at the third measurement position P3. Further, each of the two mutual differences E31LR ′ and E12R ′ related to the right wheel load gauge S1R at the first measurement position P1 is larger than the allowable value WE ′ (E31LR′L> WE ′ and E12R ′> WE ′), If the other difference E32LR ′ irrelevant to the right wheel weight S1R at the first measurement position P1 is equal to or less than the allowable value WE ′ (E32LR ′ ≦ WE ′), the right side of the first measurement position P1. It is determined that an abnormality has occurred in the wheel scale S1R. In addition, each of the two mutual differences E32LR ′ and E12R ′ related to the right wheel scale S2R at the second measurement position P2 is larger than the allowable value WE ′ (32LR ′> WE ′ and E12R ′> WE ′), and When the other difference E31LR ′ irrelevant to the right wheel weight meter S2R at the second measurement position P2 is equal to or less than the allowable value WE ′ (E31LR ′ ≦ WE ′), the left wheel at the second measurement position P2 It is determined that an abnormality has occurred in the weighing scale S2R. In such a manner, an abnormality diagnosis is performed for each wheel scale S3L, S1R, and S2R to be diagnosed.

  When the abnormality diagnosis reveals that an abnormality has occurred in any of the wheel scales S3L, S1R, and S2R that are diagnosis targets, for example, when an abnormality has occurred in the left wheel scale S3L at the third measurement position P3 Is the same as in the state shown in FIG. 7, because an abnormality has occurred in all the left wheel weight gauges S1L, S2L and S3L at the first to third measurement positions P1, P2 and P3. The weight measurement cannot be performed. Therefore, the shaft weight measurement is immediately stopped, and an alarm including information indicating that the shaft weight measurement is impossible and information prompting immediate repair is output. And, for example, when an abnormality occurs in the right wheel weight meter S1R at the first measurement position P1, both the left and right wheel weight meters S1L and S1R at the first measurement position P1 are abnormal as in the state shown in FIG. Therefore, accurate axle load measurement cannot be performed, so the axle load measurement is immediately stopped, information indicating that the axle load measurement is impossible, and prompt repairs. An alarm including information for prompting is output. Further, when an abnormality occurs in the right wheel weight meter S2R at the second measurement position P2, similarly, an abnormality has occurred in both the left and right wheel weight meters S2L and S2R at the second measurement position P2. The axle load measurement is immediately stopped, and an alarm including information indicating that the axle load measurement is impossible and information prompting an immediate repair is output.

  As described above, according to the present embodiment, when all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal, all these wheel scales S1L, S2L, S3L, S1R, S2R and Accurate axial load measurement is realized using S3R. And even if some abnormality occurs in each wheel scale S1L, S2L, S3L, S1R, S2R, and S3R, when predetermined conditions are satisfied, the first to third measurement positions P1, P2 are described in detail. And P3, one of the left and right wheel weights 22 and 24 is normal, and at least one of all the left wheel weights 22, 22 and 22 is normal, When the condition that at least one of the right wheel weight gauges 24, 24 and 24 is normal is satisfied, the axle load measurement is temporarily continued. Moreover, even if it is tentative, when the wheel load gauges S1L, S2L, S3L, S1R, S2R, and S3R are normal, that is, the axial load measurement that is approximately as accurate as normal is achieved. .

  In order to realize a series of functions of the present embodiment including normal axial load measurement, the calculation unit 36 (CPU) described above executes the calculation task shown in FIG. 10 according to the control program described above.

  That is, the stored contents (W1L [1] to W1L [M], W2L [1] to W2L [M], W3L [1] to the shift registers SR1L, SR2L, SR3L, SR1R, SR2R and SR3R shown in FIG. W3L [M], W1R [1] to W1R [M], W2R [1] to W2R [M] and W3R [1] to W3R [M]) are updated, that is, each wheel load meter S1L, S2L, When the latest wheel load measurements W1L [1], W2L [1], W3L [1], W1R [1], W2R [1] and W3R [1] are obtained by S3L, S1R, S2R and S3R The unit 36 proceeds to step S1. In step S1, it is determined whether or not the predetermined flag F is F = 0. This flag F indicates whether or not provisional axle load measurement is currently being performed. For example, when the flag F is F = 0, all wheel load gauges This indicates that the axial load measurement at the normal time when S1L, S2L, S3L, S1R, S2R, and S3R are normal is being performed, that is, that the normal operation is in progress. On the other hand, when the flag F is F = 1, it indicates that provisional axle load measurement is being performed, that is, provisional operation is in progress. The flag F is set to “0” as its initial value immediately after the axle load measuring device 10 (indicator 30) is activated. In addition, immediately after the axle load measuring apparatus 10 is started, the shift registers SR1L, SR2L, SR3L, SR1R, SR2R, and SR3R are initialized, that is, the stored contents are cleared.

  In step S1, for example, when the flag F is F = 0, that is, during normal operation, the arithmetic unit 36 proceeds to step S3. In step S3, abnormality diagnosis is performed based on the stored contents of the shift registers SR1L, SR2L, SR3L, SR1R, SR2R, and SR3R. In this step S3, since all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal, all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal. Abnormality diagnosis is performed at a certain point.

  After the abnormality diagnosis in step S3, the calculation unit 36 proceeds to step S5 and determines the result of the abnormality diagnosis in step S3. Here, for example, no abnormality has occurred in any of the wheel scales S1L, S2L, S3L, S1R, S2R and S3R, that is, all the wheel scales S1L, S2L, S3L, S1R, S2R and S3R are normal. When the determination result is obtained, the calculation unit 36 proceeds to step S7. In step S7, the abnormal data and the wheel load measured values W1L, W2L, W3L, W1R, W2R and W3R based on normal ones of the wheel load gauges S1L, S2L, S3L, S1R, S2R and S3R, Based on the above, the final axial load measurement value WX is obtained. The abnormal data referred to here is data indicating which of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R is abnormal, and is stored in, for example, the memory described above. ing. The abnormality data is cleared immediately after the axle load measuring device 10 is activated.

  Then, the calculation unit 36 proceeds to step S9, and displays the axial load final measurement value WX obtained in step S7 described above on the display 40. The axial load final measurement value WX is stored in the memory as described above, and is output to an external device (not shown) as necessary. And the calculating part 36 once complete | finishes this calculation task.

  On the other hand, when it is determined in step S5 that an abnormality has occurred in any of the wheel load gauges S1L, S2L, S3L, S1R, S2R, and S3R, the arithmetic unit 36 proceeds to step S11. In step S11, “1” is set to the flag F described above. This indicates that provisional operation is about to start.

  Further, the calculation unit 36 proceeds to step S13, and stores in the above-described abnormal data which of the wheel load gauges S1L, S2L, S3L, S1R, S2R, and S3R has occurred, that is, updates the abnormal data. To do. And it progresses to step S15, and after outputting the warning according to the said abnormality data, it progresses to step S17.

  In step S <b> 17, the calculation unit 36 determines whether or not provisional operation is possible. That is, at each of the first to third measurement positions P1, P2, and P3, one of the left and right wheel weights 22 and 24 is normal, and all the left wheel weight meters 22, 22 are combined. And whether or not the above-mentioned condition that at least one of all right-hand weight gauges 24, 24 and 24 is normal is satisfied. To do. For example, when the condition is satisfied, it is determined that the temporary operation is possible, and the process proceeds to step S7. On the other hand, if the condition is not satisfied, it is determined that provisional operation is impossible, and the process proceeds to step S19. Note that when the process proceeds to step S17 for the first time after the axle load measuring device 10 is started, the condition is basically satisfied (unless any of the pair of left and right wheel load gauges 22 and 24 is abnormal at the same time). Therefore, the process proceeds from step S19 to step S7.

  In step S19, the calculation unit 36 immediately stops the axle load measurement and outputs an alarm including information indicating that the axle weight measurement is impossible, information prompting immediate repair, and the like. A predetermined process for stopping the main operation of the measuring apparatus 10 is performed. Then, this calculation task is terminated.

  Furthermore, when the flag F is F = 1 in step S1 described above, that is, when the temporary operation is in progress, the arithmetic unit 36 proceeds from step S1 to step S21. In step S21, based on the above abnormal data and the contents stored in the shift registers SR1L, SR2L, SR3L, SR1R, SR2R and SR3R, the wheel scales S1L, S2L, S3L, S1R, S2R and An abnormality diagnosis is performed for an effective one used in the provisional operation in S3R.

  After the abnormality diagnosis in step S21, the calculation unit 36 proceeds to step S23 and determines the result of the abnormality diagnosis in step SS21. Here, for example, when it is determined that a new abnormality has not occurred in a valid one of the wheel scales S1L, S2L, S3L, S1R, S2R, and S3R, the process proceeds to step S7 described above. On the other hand, when the determination result that the new abnormality has occurred is obtained, the process proceeds to step S13 described above.

  By executing such a calculation task, a series of functions of the present embodiment is realized.

  In addition, the content demonstrated in this embodiment is one specific example for implement | achieving this invention until it gets tired, and does not limit the scope of the present invention.

  For example, the abnormality diagnosis is not limited to the content described in the present embodiment. As an example, the mutual ratios R12L, R23L, and R31L based on the following formulas 56, 57, and 58 may be obtained instead of the above-described formulas 13, 14, and 15.

<< Formula 56 >>
R12L = | (W1LA / W2LA) -1 |

<Formula 57>
R23L = | (W2LA / W3LA) -1 |

<< Formula 58 >>
R31L = | (W3LA / W1LA) -1 |

  Then, by comparing each of these mutual ratios R12L, R23L, and R31L with a preset allowable value WR, whether or not an abnormality has occurred in any of the left wheel weight gauges S1L, S2L, and S3L When the abnormality has occurred, it may be determined whether the abnormality has occurred in each of the left wheel load gauges S1L, S2L, and S3L. That is, for example, if the mutual ratios R12L, R23L, and R31L are all equal to or less than the allowable value WR (R12L ≦ WR, R23L ≦ WR, and R31L ≦ WR), the left wheel weights S1L, S2L, and S3L It is determined that no abnormality has occurred, that is, all the left side weight gauges S1L, S2L and S3L are normal. Of the mutual ratios R12L, R23L, and R31L, the two mutual ratios R12L and R31L related to the left wheel scale S1L at the first measurement position P1 are larger than the allowable value WR (R12L> WR and R31L> WR). ) And when the other mutual ratio R23L irrelevant to the left wheel load gauge S1L at the first measurement position P1 is equal to or less than the allowable value WR (R23L ≦ WR), the left wheel load at the first measurement position P1. It is determined that an abnormality has occurred in the total S1L. Further, each of the two mutual ratios R12L and R23L related to the left wheel scale S2L at the second measurement position P2 is larger than the allowable value RE (R12L> WR and R23L> WR), and the second measurement position P2 When the other mutual ratio R31L unrelated to the left wheel load meter S2L is equal to or less than the allowable value WR (R31L ≦ WR), it is determined that an abnormality has occurred in the left wheel load meter S2L at the second measurement position P2. Is made. Further, each of the two mutual ratios R23L and R31L related to the left wheel scale S3L at the third measurement position P3 is larger than the allowable value WR (R23L> WR and R31L> WR), and the third measurement position P3. When the other mutual ratio R12L unrelated to the left wheel load meter S3L is equal to or less than the allowable value WR (R12L ≦ WR), it is determined that an abnormality has occurred in the left wheel load meter S3L at the third measurement position P3. Is made. In such a manner, an abnormality diagnosis for each of the left wheel weight scales S1L, S2L, and S3L may be performed. The same applies to the abnormality diagnosis for each right wheel weight meter S1R, S2R, and S3R.

  Then, the values of M and N related to the shift registers SR1L, SR2L, SR3L, SR1R, SR2R, and SR3R shown in FIG. 4 may be equivalent to each other (M = N).

  Furthermore, the number (number of sets) of the pair of left and right wheel load gauges 22 and 24 is not limited to a total of three sets, and may be more than that. As the number of the left and right wheel load gauges 22 and 24 increases, the accuracy of the axle load measurement improves. On the other hand, the overall structure of the axle load measuring apparatus 10 including these wheel load gauges 22 and 24 is improved. Increase complexity and cost.

  In addition, although the dynamic measurement method is adopted as each wheel weight meter S1L, S2L, S3L, S1R, S2R and S3R, the static measurement method may be adopted, or these Both of them may be appropriately mixed.

DESCRIPTION OF SYMBOLS 10 Axle load measuring apparatus 20 Weighing part 22, 24 Wheel scale 30 Indicator 36 Calculation part 100 Vehicle 102, 104 Wheel 200 Traveling path

Claims (4)

A pair of left and right wheel weight meters provided at each of three or more different measurement positions on the vehicle traveling path in the traveling direction of the vehicle and measuring the left and right wheel weights substantially simultaneously and individually for each axle of the vehicle; ,
Axle load calculating means for obtaining a final axle load measurement value, which is a final measurement value of the axle weight, based on a wheel load measurement value that is a measurement value of the wheel load by each of the wheel load gauges,
An abnormality determining means for determining whether an abnormality has occurred in any one of the wheel scales based on the wheel weight measurement values obtained by the respective wheel scales;
Comprising
The axle load calculating means is
When it is determined by the abnormality determination means that the abnormality has not occurred, the axle load final measurement value is obtained based on the wheel load measurement values by all the wheel load gauges,
When it is determined by the abnormality determining means that the abnormality has occurred, the wheel load gauge in which the abnormality has occurred is an invalid wheel load gauge, and the wheel load gauges other than the invalid wheel load gauge are effective wheel load gauges. Based on the abnormal aspect including the disposition of the invalid wheel load meter and the wheel load measurement value by each effective wheel load meter, the final axle load measurement value is obtained,
When the abnormality determining means determines that the abnormality has occurred, the abnormality determination means further determines that there is an abnormality in any of the effective wheel gauges based on the abnormality mode and the wheel weight measurement values obtained by the effective wheel weights. A shaft weight measuring device that determines whether or not it has occurred . A pair of left and right wheel weight meters provided at each of three or more different measurement positions on the vehicle traveling path in the traveling direction of the vehicle and measuring the left and right wheel weights substantially simultaneously and individually for each axle of the vehicle; ,
Axle load calculating means for obtaining a final axle load measurement value, which is a final measurement value of the axle weight, based on a wheel load measurement value that is a measurement value of the wheel load by each of the wheel load gauges,
An abnormality determining means for determining whether an abnormality has occurred in any one of the wheel scales based on the wheel weight measurement values obtained by the respective wheel scales;
Comprising
The axle load calculating means is
When it is determined by the abnormality determination means that the abnormality has not occurred, the axle load final measurement value is obtained based on the wheel load measurement values by all the wheel load gauges,
When it is determined by the abnormality determining means that the abnormality has occurred, the wheel load gauge in which the abnormality has occurred is an invalid wheel load gauge, and the wheel load gauges other than the invalid wheel load gauge are effective wheel load gauges. Based on the abnormal aspect including the disposition of the invalid wheel load meter and the wheel load measurement value by each effective wheel load meter, the final axle load measurement value is obtained,
An abnormal condition determining means for determining whether or not the abnormal condition satisfies a condition for obtaining the axial load final measurement value with an accuracy of a predetermined level or higher when the abnormality determining means determines that the abnormality has occurred; In addition,
The axle load calculating means is
When the abnormality determining means determines that the abnormality has occurred, and further, when the abnormality aspect determining means determines that the abnormality aspect satisfies the condition, the axial load final measurement value is obtained,
When it is determined by the abnormality determining means that the abnormality has occurred, and when the abnormal condition determining means determines that the abnormal condition does not satisfy the condition, the calculation for obtaining the final axial load measurement value is stopped. to <br/> axle load measuring device. An alarm output means for outputting an alarm when it is determined by the abnormality determination means that the abnormality has occurred;
The axial load measuring device according to claim 1 or 2 . The alarm includes invalid wheel gauge information representing the invalid wheel scale,
The axial weight measuring apparatus according to claim 3 .

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