JP2009025106A - Vehicle weighing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide vehicle weighing equipment which accurately weighs a running vehicle even when the running vehicle passes at a high speed. <P>SOLUTION: The vehicle weighing equipment has a pair of first load cell parts 5a and 5b, a pair of second load cell parts 6a and 6b, an arithmetic part 9, a display part 10 and a storage part 12. The arithmetic part 9 receives electric signals from the second paired load cell parts 6a and 6b, calculates therefrom the time required for passing of the vehicle and compares this time with the maximum value of the time required for detection which is stored in the storage part 12. When the time for passing is shorter, it calculates an increase gradient of a load detected by the first load cell parts 5a and 5b during a load operation time in the time for passing, compares this gradient with an increase gradient of a load for an operation detected during the load operation time and calculates, as a load, the load relating to the second gradient which substantially conforms to the first gradient. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle weight measuring device that measures the weight of a vehicle, and more particularly to a vehicle weight measuring device that can measure the weight of a traveling vehicle.

  In general, when measuring the weight of a vehicle, a method is widely used in which a running vehicle is temporarily stopped by weighing, and the weight is measured in a stationary state. On the other hand, from the viewpoint of improving work efficiency and mitigating traffic congestion, recently, a method of measuring weight while a vehicle is running has been attracting attention. However, the weight measurement of a running vehicle has a problem that the accuracy is inferior to the weight measurement in a stationary state and the reliability of the measurement value is low. Therefore, several developments have been made to eliminate such problems.

For example, Patent Document 1 describes the weight of a traveling vehicle, the number of axles, using an optical fiber sensor and a switching mechanism, under the name “apparatus for measuring characteristics by measuring the weight of the traveling vehicle” An invention relating to an apparatus for obtaining characteristics such as weight distribution on an axle, wheel base, axle width, number of tires on each axle, weight distribution on tires on each axle, vehicle speed and tire footprint is disclosed. .
The invention disclosed in this Patent Document 1 is formed with a long base device having upper and lower surfaces and placed on a roadway, and spaced apart from each other in the longitudinal direction on the upper surface of the base device. A plurality of parallel elongated groove means; an elongated optical fiber sensing device supported by the plurality of groove means and extending along the length of the groove means; and an optical fiber sensing device that transmits light; The received light source device, the light receiving device that receives transmitted light and is installed at the other end of each of the optical fiber sensing devices, and receives the weight of the running vehicle in contact with each of the optical fiber sensing devices And a contact grid device that changes the intensity of light transmitted therethrough. Also, a plurality of signal supply on / off switches capable of supplying signals indicating the speed of the vehicle, the number of axles of the vehicle, the tire position and the wheel base of the vehicle in contact with the tire on each axle of the running vehicle The device is installed in a substantially parallel position on the same plane as the optical fiber sensing device.

  When the vehicle passes over the base device including the optical fiber device on the roadway, the light emitted from the light source device and received by the light receiving device in the optical fiber device is attenuated by the weight of the vehicle, and the amount of attenuation of this light is calculated. Thus, the weight of each axle of the traveling vehicle can be obtained, and the combined weight of each axle becomes the total weight of the vehicle. The contact grid device is for selectively giving a plurality of optical fiber devices a desired sensitivity with respect to a specific weight range. By changing the grid structure, the contact grid device can cope with a load applied to the optical fiber in each optical fiber device. Transmission loss through the optical fiber can be adjusted to be sensitive to the dynamic weight range required to accurately measure the weight of the vehicle within the extended weight range. And the signal supply on / off switch device makes it possible to recognize the speed of the vehicle, the number of axles of the vehicle, the tire position and the wheelbase of the vehicle. It is used to compensate for lift generated in a traveling vehicle that affects the vehicle weight and reduces the vehicle weight, thereby enabling more accurate vehicle weight measurement.

Further, Patent Document 2 discloses that a stationary weight value is obtained by performing highly reliable arithmetic processing on time series data of a weighing value that fluctuates of a traveling vehicle under the name of “method and apparatus for measuring a stationary weight of a traveling vehicle”. An invention relating to a method for measuring a stationary weight of a traveling vehicle and a device for calculating the vehicle are disclosed.
In the invention disclosed in Patent Document 2, a dynamic weight measuring device for a vehicle includes weighing means for weighing a vehicle during traveling, and weighing value data obtained by the weighing means as time series weighing value data. An input means for sequentially capturing, a periodicity evaluation means for calculating a periodicity from a data group within a predetermined range with respect to the maximum value obtained from time series weighing value data, and a range within the predetermined range An effective data section setting means for setting an effective data section from the internal data group based on periodicity, an arithmetic means for calculating a stationary weight value of the vehicle from the in-range data group in the effective data section, and outputting the stationary weight value Output means.
Then, in a weighing means having a weighing platform on which the entire vehicle can be placed, when the vehicle runs on the weighing platform, time series data of weighing values is obtained by a load cell provided in the weighing means, and this time series data is The weighing value when the front wheel, the front wheel, the rear wheel, and the rear wheel are respectively placed on the weighing table is expressed as three separate peaks. The total weight of the vehicle can be obtained by analyzing the peaks that include the front and rear wheels, or by analyzing the peaks that include only the front wheels or only the rear wheels, respectively. Since the calculation of the value and the periodicity and the setting of the effective data section are performed, it is possible to provide a measurement method and apparatus with higher accuracy than the prior art.

Patent Document 3 discloses a loading load meter having a center of gravity position detection function capable of measuring the weight of a lorry by an axle weight method and detecting a deviation of the load, under the name “loading weight meter having a center of gravity position detection function”. An invention relating to a scale is disclosed.
The invention disclosed in Patent Document 3 includes an axle weight meter that sequentially measures the uniaxial weights of the front and rear wheels of a vehicle at the same height as the road surface, and the uniaxial weight of either one of the front and rear wheels of the vehicle. And a front-rear center-of-gravity position determining means for determining a center-of-gravity position in the front-rear direction of the hand vehicle using the total weight obtained by adding the uniaxial weights of the front and rear wheels and the distance between the axles between the front wheels and the rear wheels It is what you have.
Then, when the front or rear wheel is placed in a stationary state on the axle load balance composed of left and right pairs, the uniaxial weight of the front wheel or the rear wheel is obtained sequentially, and each of the obtained front and rear wheels is uniaxial. Adding the weight gives the total weight of the vehicle. Here, assuming that the distance between the axles between the front wheels and the rear wheels is L, the uniaxial weight of the front wheels is Wf, the uniaxial weight of the rear wheels is Wb, and the distance from the front wheels to the position of the center of gravity is Lx, Can be obtained by Lx = L × (Wb / (Wb + Wf)). Further, the center-of-gravity position deviation calculation means can also obtain the center-of-gravity position deviation by comparing the center-of-gravity position Lx with the center-of-gravity position Ls under the ideal load of the vehicle to be measured. In addition, the left and right wheels can measure the weight independently, and the total weight of the front and rear right wheels is obtained to determine the uniaxial weight of the front and rear wheels and the wheels of various vehicles stored in advance in the storage means. The center of gravity position in the left-right direction can also be obtained based on information on the width in the horizontal direction.
Japanese Patent No. 2636949 Japanese Patent No. 2710785 Japanese Patent No. 3164899

  However, in the invention disclosed in Patent Document 1 which is the above-described prior art, the weight of the traveling vehicle is measured using an optical fiber. The relationship between the attenuation of the optical fiber light and the vehicle weight is concrete. There is a problem that the reliability of the measured vehicle weight is low.

  In the invention disclosed in Patent Document 2, the speed of the traveling vehicle is not mentioned, and when measuring the weight of the traveling vehicle using the load cell, the weight change with respect to the time of the traveling vehicle is stably obtained. However, since the information obtained from the load cell when the vehicle speed is high is considered to be less reliable, there is a problem that correction regarding the vehicle speed is necessary.

  The invention disclosed in Patent Document 3 is basically intended for measuring the weight of a stationary vehicle, and it is necessary to measure the vehicle while the vehicle is stopped, and the weight measurement of the traveling vehicle is not possible. In addition, there is a problem that the measurement of the weight of a stationary vehicle causes a reduction in work efficiency and a traffic jam.

  The present invention has been made in response to such a conventional situation, and an object of the present invention is to provide a vehicle weight measuring device that accurately measures the weight of a traveling vehicle even when the traveling speed of the traveling vehicle is high.

In order to achieve the above object, the vehicle weight measuring device according to the first aspect of the present invention is provided on a pair of loading platforms capable of loading a pair of left and right wheels of the vehicle, respectively, and detects a load applied to the pair of loading platforms. A pair of first load cell units that output as electrical signals,
At least one of the pair of loading platforms is installed separately from the front and rear of the first load cell portion in the traveling direction of the vehicle, and detects a load applied to the loading platform and outputs an electrical signal. A load cell section;
A calculation unit that receives an electrical signal from the first load cell unit and calculates each load applied from the pair of left and right wheels of the vehicle;
A display unit for displaying the load calculated by the calculation unit;
Regarding the load detection characteristics of the first load cell portion, a desired load, a time required for detecting the desired load (hereinafter referred to as a required detection time), and a time shorter than the minimum value of the required detection time are set in advance. A vehicle weight measuring device having a load calculation time and a storage unit for storing data relating to a load at the time of the load calculation time (hereinafter referred to as a calculation load),
The calculation unit receives an electric signal from the pair of second load cell units, calculates a passing time of the vehicle, compares the passing time with the maximum value of the required detection time stored in the storage unit, Is short, the load increasing gradient detected in the first load cell unit during the load calculating time during the passage time (hereinafter referred to as the first gradient) is calculated and detected during the load calculating time. Compared with an increasing gradient of calculation load (hereinafter, referred to as a second gradient), a load related to a second gradient that substantially matches the first gradient is calculated as a load.

According to the vehicle weight measuring apparatus having such a configuration, when the pair of left and right wheels of the traveling vehicle pass so as to be loaded on the pair of loading platforms, the pair of first load cell portions provided on the pair of loading platforms is The load applied to the pair of loading platforms is detected and output as an electrical signal, and the calculation unit receives the electrical signal from the first load cell unit and calculates the respective load applied from the pair of left and right wheels of the vehicle. The display unit acts to display the load calculated by the calculation unit.
Further, in the storage unit, the load detection characteristics of the first load cell unit are set in advance so as to be shorter than a desired load, a required detection time required for detecting the desired load, and a minimum value of the required detection time. The load calculation time and data related to the calculation load when the load calculation time elapses are stored.
And a pair of 2nd load cell parts installed in at least any one of a pair of loading bases spaced apart before and behind the 1st load cell part in the advancing direction of vehicles detect a load concerning a loading stand, respectively. The calculation unit calculates the passing time of the vehicle wheel from the time difference between the two electric signals obtained by receiving the electric signals from the pair of second load cell units.
Further, the calculation unit compares the passage time with the maximum value of the required detection time stored in the storage unit, and if the passage time is short, the first load cell unit performs the load calculation time during the passage time. The first gradient is calculated as the detected increase gradient of the load, and the first gradient substantially matches the second gradient as the increase gradient of the calculation load detected during the load calculation time. The load related to the gradient of 2 acts as a load.

According to a second aspect of the present invention, there is provided a pair of load cell portions which are respectively provided on a pair of loading platforms capable of loading a pair of left and right wheels of a vehicle and which detect loads applied to the pair of loading platforms and output them as electric signals. When,
A calculation unit that receives an electrical signal from at least one load cell unit and calculates each load applied from a pair of left and right wheels of the vehicle;
A display unit for displaying the load calculated by the calculation unit;
Regarding the load detection characteristics of the load cell, a desired load, a time required for detecting the desired load (hereinafter referred to as detection required time), and a load calculation set in advance shorter than the minimum value of the detection required time A vehicle weight measuring device having a time and a storage unit for storing data relating to a load when the load calculation time has elapsed (hereinafter referred to as a calculation load),
When the arithmetic unit receives an electrical signal from the load cell unit and calculates the passing time of the wheel of the vehicle, and compares this passing time with the maximum value of the required detection time stored in the storage unit, the passing time is short Includes calculating an increase gradient of the load detected in the load cell during the load calculation time during the passage time (hereinafter referred to as the first gradient), and increasing the gradient of the calculation load detected during the load calculation time. Compared with (hereinafter referred to as the second gradient), the load related to the second gradient, which substantially matches the first gradient, is calculated as the load.

In the vehicle weight measuring device having such a configuration, when the traveling vehicle passes over the pair of loading platforms, the pair of load cell units respectively detect the loads applied to the pair of loading platforms and output them as electric signals, and the calculation unit Receives an electrical signal from the load cell unit and calculates each load applied from the pair of left and right wheels of the vehicle, and the display unit operates to display the load calculated by the calculation unit.
In the storage unit, regarding the load detection characteristic of the load cell unit, a desired load, a detection time required for detecting the desired load, and a load calculation time set in advance shorter than the minimum value of the detection time And data relating to the calculation load when the load calculation time elapses.
Then, the computing unit calculates the vehicle transit time from the electrical signal acquired in time series by the load cell unit, compares the transit time with the maximum value of the required detection time stored in the storage unit, and passes the transit time. In a short case, the first gradient is calculated as an increase gradient of the load detected in the load cell unit during the load calculation time during the passage time, and the first gradient as the increase gradient of the calculation load detected during the load calculation time is calculated. Compared with the gradient of 2, the load according to the second gradient, which is substantially coincident with the first gradient, acts to calculate as a load.

According to a third aspect of the present invention, in the vehicle weight measuring device according to the first or second aspect, the calculation unit calculates the uniaxial weight by adding the loads applied from the pair of left and right wheels of the vehicle. The total weight is calculated by adding a plurality of uniaxial weights obtained for a plurality of axles installed in the vehicle.
In the vehicle weight measuring apparatus having such a configuration, in addition to the operation of the invention according to claim 1 or 2, the calculation unit adds the respective loads applied from the pair of left and right wheels of the vehicle to obtain a uniaxial weight. And the total weight of the vehicle is calculated by adding a plurality of uniaxial weights obtained for a plurality of axles installed in the vehicle.
In the present application, the uniaxial weight means the weight of the vehicle applied to one axle, and is distinguished from the axle itself.

According to a fourth aspect of the present invention, in the vehicle weight measuring device according to any one of the first to third aspects, the calculation unit calculates a difference between loads applied from a pair of left and right wheels of the vehicle. When the difference calculated by comparing with a preset reference value is larger than the reference value, an alarm signal is generated, and the display unit includes an alarm means for receiving the alarm signal and generating an alarm. .
In the vehicle weight measuring apparatus having such a configuration, in addition to the operation of the invention according to any one of claims 1 to 3, the calculation unit is configured to calculate each load applied from the pair of left and right wheels of the vehicle. When the difference calculated by comparing with a preset reference value is larger than the reference value, an alarm signal is generated, and the alarm means of the display unit displays the alarm signal. Receives and acts to generate an alarm.

According to a fifth aspect of the present invention, in the vehicle weight measuring device according to the third or fourth aspect, a plate number reading device that images a vehicle license plate and reads the vehicle plate number, and a vehicle weight measurement target in advance. A second storage unit that stores the total weight allowable value of the vehicle and the vehicle plate number described in the license plate of the vehicle in association with each other,
The calculation unit searches the second storage unit using the vehicle plate number read by the plate number reading device as a key, extracts the total weight allowable value, compares the total weight with the total weight allowable value, If it is larger than the weight tolerance, it is equipped to generate an alarm signal,
Furthermore, it is characterized by comprising second alarm means for receiving an alarm signal and generating an alarm.
In the vehicle weight measuring device having such a configuration, the plate number reading device acts so as to recognize the vehicle plate number described in the license plate of the vehicle to be measured, and corresponds to the vehicle plate number. By storing the total weight allowable value, the calculation unit acts to be able to determine whether or not the total weight measured via the vehicle plate number exceeds the allowable value.
Focusing on the vehicle plate number of the license plate installed for each vehicle, the total weight allowable value of each vehicle can be managed through this vehicle plate number.

According to a sixth aspect of the present invention, in the vehicle weight measuring device according to the fifth aspect, the tare weight value and the load capacity allowance value of the vehicle are replaced with the vehicle plate number described on the number plate of the vehicle instead of the total weight allowance value. The calculation unit compares the loaded load value obtained by subtracting the tare weight value from the measured total weight of the vehicle and the allowable load amount. An alarm signal is generated.
In the vehicle weight measuring apparatus having such a configuration, the tare weight value and the allowable load amount are stored instead of the total weight allowable value, and the tare weight value is subtracted from the measured total weight of the vehicle. , And this is compared with the allowable load amount to generate an alarm signal.

According to a seventh aspect of the present invention, in the vehicle weight measuring device according to the first aspect, the distance between the first axle and the second axle of the vehicle to be measured in advance and the total weight allowable value of the vehicle are determined. A third storage unit that stores the corresponding information,
The calculation unit adds the respective loads applied from a pair of left and right wheels related to at least the first and second axles of the vehicle to calculate the uniaxial weight, and includes the first and second axles installed in the vehicle. The total weight is calculated by adding a plurality of uniaxial weights obtained for
Receiving electrical signals from the pair of second load cell parts to calculate the passing time of the wheels of the vehicle, calculating the speed of the vehicle from this passing time and the distance between the pair of second load cell parts,
An electric signal is received from any one of the pair of first load cell units or the pair of second load cell units, and the left and right sides of the second axle from the left and right wheels of the first axle of the vehicle. Calculate the inter-wheel transit time to one of the wheels,
From the passing time between the wheels and the speed of the vehicle, the distance between the first axle and the second axle of the vehicle is calculated,
Using the distance between the first axle and the second axle as a key, the third storage unit is searched to extract the total weight allowable value of the vehicle, and the total weight and the total weight allowable value are compared to determine the total weight. Generates an alarm signal if is greater than the total weight tolerance,
A second alarm means for receiving an alarm signal and generating an alarm is provided.
In the vehicle weight measuring device configured as described above, the distance between the first axle and the second axle of the vehicle to be measured is associated with the total weight allowable value of the vehicle and stored in the third storage unit. The vehicle speed is calculated from the passing time of the wheels measured by the pair of second load cell units, and further receives an electric signal of the load detected in the first load cell unit or the second load cell unit. Thus, the passage time between the first axle and the second axle is measured, and the distance between the first axle and the second axle is calculated from the previous vehicle speed. Thus, using the calculated distance between the first axle and the second axle as a key, the total weight allowable value stored in the third storage unit is searched and extracted, and the total weight allowable value and the measured total weight are measured. The weight is compared, and when an allowable value is exceeded, an alarm signal is generated to generate an alarm.
The first axle and the second axle are not particularly limited in the vehicle, but if the vehicle has only two axles, the front axle is naturally the first axle and the rear axle is the second axle. It corresponds to. Further, in a vehicle having three or more axles, it is desirable to select one of the axles provided in the front as the first axle and one of the axles provided in the rear as the second axle.

According to an eighth aspect of the present invention, in the vehicle weight measuring device according to the second aspect, the distance between the first axle and the second axle of the vehicle to be measured for the vehicle weight and the total weight allowable value of the vehicle in advance. A third storage unit that stores the corresponding information,
The calculation unit adds the respective loads applied from a pair of left and right wheels related to at least the first and second axles of the vehicle to calculate the uniaxial weight, and includes the first and second axles installed in the vehicle. The total weight is calculated by adding a plurality of uniaxial weights obtained for
Receiving an electrical signal from at least one load cell part to calculate the vehicle wheel passage time, and calculating the vehicle speed from the passage time and the length of the load cell part in the traveling direction of the vehicle,
An inter-wheel passing time from one of the left and right wheels of the first axle of the vehicle to either of the left and right wheels of the second axle by receiving an electrical signal from any one of the pair of load cell portions To calculate
From the passing time between the wheels and the speed of the vehicle, the distance between the first axle and the second axle of the vehicle is calculated,
Using the distance between the first axle and the second axle as a key, the third storage unit is searched to extract the total weight allowable value of the vehicle, and the total weight and the total weight allowable value are compared to determine the total weight. Generates an alarm signal if is greater than the total weight tolerance,
A second alarm means for receiving an alarm signal and generating an alarm is provided.
In the vehicle weight measuring device configured as described above, the invention described in claim 7 uses the two pairs of load cell portions to measure the speed of the vehicle and the passing time of the first axle and the second axle. In contrast to the calculation, the pair of load cell units measure and calculate each.

According to a ninth aspect of the present invention, in the vehicle weight measuring device according to the seventh or eighth aspect, the tare weight value and the load capacity allowance value of the vehicle are set to the first axle and the first load amount of the vehicle in place of the total weight allowance value. 2 is stored in correspondence with the distance between the axles, and the calculation unit compares the loaded load value obtained by subtracting the tare weight value from the measured total weight of the vehicle with the allowable load amount, and the loaded load value is determined to be allowable. When the value is larger than the value, an alarm signal is generated.
The vehicle weight measuring device configured as described above also operates in the same manner as the invention according to claim 7 or claim 8.

Finally, according to a tenth aspect of the present invention, in the vehicle weight measuring device according to any one of the third to ninth aspects, the calculation unit adds each load applied from the pair of left and right wheels of the vehicle. The time from the start to the end of the process of calculating the uniaxial weight and the process of obtaining the total weight by adding the plurality of uniaxial weights obtained for the plurality of axles installed in the vehicle, or from the start of these processes It comprises a light emitting means for generating a wait signal at a time obtained by adding a predetermined time to the time until completion, and generating light for receiving the wait signal and indicating a wait state.
In the vehicle weight measuring device configured as described above, when performing calculation for adding a uniaxial load or a plurality of uniaxial loads, the light emitting means indicating the waiting state prevents the next vehicle from entering the vehicle weight measuring device. Acts like

  As described above, in the vehicle weight measuring device according to the first aspect of the present invention, the vehicle passes through the loading platform at a high speed and the load measured by the first load cell unit is to be originally measured. The first gradient, which is the increase gradient of the load detection characteristic measured by the first load cell, and the increase gradient of the load detection characteristic of the known load, which is measured and stored in advance, even when the load is less than By using the fact that the two gradients coincide with each other, the load related to the second gradient that coincides with the first gradient is calculated, thereby enabling accurate weight measurement.

  Moreover, in the vehicle weight measuring device according to claim 2 of the present invention, the calculation unit calculates the transit time from the time change of the electrical signal detected by the pair of load cell units, so the vehicle according to claim 1. Unlike the weight measuring device, it is not necessary to install a pair of second load cell units, and the device can be reduced in weight and size.

  In the vehicle weight measuring device according to claim 3 of the present invention, since the total weight is obtained by sequentially calculating and adding the uniaxial weights of the left and right wheels of the vehicle, in a large vehicle having a plurality of axles. Can accurately measure the weight.

  In the vehicle weight measuring device according to claim 4 of the present invention, the difference in load applied from the pair of left and right wheels of the vehicle is compared with a reference value to determine the accuracy of the measurement, and this difference is larger than the reference value. In this case, an alarm is generated, so that the measurer can be prompted to remeasure.

In the vehicle weight measuring device according to the fifth to ninth aspects of the present invention, in addition to the effect of the invention according to the third or fourth aspect, the measured / calculated total weight and the total weight allowable value are obtained. By comparison, it can be evaluated whether or not the allowable value is exceeded.
In particular, the vehicle weight measuring device according to claim 5 and claim 6 is provided with a plate number reading device for reading the vehicle plate number, so that the vehicle plate number and the total weight allowable value for each vehicle or The vehicle weight measurement can be managed through the vehicle plate number corresponding to the one added with the tare weight. Even when an additional vehicle is generated as a measurement target, the vehicle plate number and the total weight allowable value for the vehicle, or a value obtained by adding the tare weight to the vehicle can be stored in the second storage unit so that the vehicle can be easily stored. It is possible to measure the weight.
In particular, the vehicle weight measuring device according to any one of claims 7 to 9 does not require a plate number reading device and can exhibit an economic effect.

  In the vehicle weight measuring device according to claim 10 of the present invention, it is possible to suppress the next vehicle from entering the vehicle weight measuring device at the stage where the measurement of one vehicle to be measured is not completed. . Therefore, the vehicle weight can be measured with high accuracy as a whole.

Hereinafter, a vehicle weight measuring apparatus according to a preferred embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a configuration diagram of a vehicle weight measuring apparatus according to the present embodiment of the present invention.
In FIG. 1, a vehicle weight measuring apparatus 1 includes a pair of loading platforms 2a and 2b capable of loading a pair of left and right wheels of a vehicle in a traveling direction A. The pair of loading platforms 2a and 2b includes a pair of left and right wheels. A pair of first load cells 5a and 5b for detecting a load applied to the pair of loading platforms 2a and 2b as electric signals are provided. In addition, a pair of second load cells 6a and 6b are disposed on the loading platform 2a so as to be separated from each other in the front-rear position of the first load cell 5a in the traveling direction A. The pair of second load cells 6a and 6b The load at the front and rear positions of the first load cell 5a is detected as an electric signal from one of the wheels of the vehicle passing through the loading platform 2a. In addition, slope plates indicated by reference numerals 3a, 3b and reference numerals 4a, 4b are provided before and after the pair of loading platforms 2a, 2b, and the pair of left and right wheels of the vehicle smoothly supports the pair of loading platforms 2a, 2b. You can get on and off.

The pair of first load cells 5a and 5b and the pair of second load cells 6a and 6b are connected to the amplifier 7, respectively, and then the A / D converter 8 and the arithmetic unit 9 are connected in this order. The amplifier 7 amplifies electric signals detected in the pair of first load cells 5a and 5b and the pair of second load cells 6a and 6b, and these amplified electric signals are A / D converted. Is transmitted to the device 8. The A / D converter 8 converts an analog electrical signal into a digital signal and transmits it to the arithmetic unit 9. Although details will be described later, the arithmetic unit 9 performs various arithmetic operations using an arithmetic circuit, transmits the arithmetic result data to the connected display unit 10 and the memory 12, and the display unit 10 displays the arithmetic result data. The memory 12 stores calculation result data and measurement data in a readable manner. Further, the display unit 10 includes an alarm unit 11, and when an alarm signal is generated in the arithmetic unit 9, an alarm that can be visually or audibly recognized can be displayed or output. Furthermore, the vehicle weight measuring device 1 according to the present embodiment includes a printer 21 that can receive and print calculation result data obtained by processing by the calculation unit 9 or draw a graph or the like. can do. A cover or the like is preferably provided at the output portion of the printer 21, that is, a portion where printed paper is discharged, as a measure against dust. Further, as the power source of the vehicle weight measuring apparatus 1 including the printer 21, a normal AC 100V power source can be used, and for example, a DC 12V power source mounted on the vehicle can be used.
It should be noted that the pair of first load cells 5a and 5b has a desired width in advance with respect to the traveling direction of the vehicle, and the arithmetic unit 9 determines the vehicle from the electric signals from the pair of first load cells 5a and 5b. If the passage time can be calculated, the pair of second load cells 6a and 6b need not be installed.
Further, it is desirable that the pair of second load cells 6a and 6b be provided adjacent to the pair of first load cells 5a and 5b as much as possible. This is because, as will be described later, the time passing through the width of the pair of first load cells 5a, 5b is obtained from the pair of second load cells 6a, 6b, and the speed is calculated. In FIG. 1, it appears that the signal line connected from the first load cell 5a to the amplifier 7 and the signal line connected from the second load cell 6b to the amplifier 7 intersect, but it is configured as a separate signal line. Is.

Further, the vehicle weight measuring apparatus 1 includes a database 23 in addition to the memory 12, and is previously provided with a total weight allowable value data 24, a load capacity allowable value data 25 and a tare weight value data 26 of a vehicle to be measured, The weight data in the unloaded state is stored. These data are stored in pairs with the vehicle plate number data 27 and the inter-axle distance data 28, which are the contents posted on the vehicle license plate. In addition, the vehicle plate number data 27 is a concept that includes a registered place name and a small number part representing a vehicle type displayed next to the registered place name in addition to a 4-digit number.
In this embodiment, the total weight allowable value data 24, the load capacity allowable value data 25, and the tare weight value data 26 are stored, but only the total weight allowable value data 24, or the load capacity allowable value data 25 and the tare weight data are stored. Only the combination of the value data 26 may be stored. The same applies to the vehicle plate number data 27 and the inter-axle distance data 28, and only the vehicle plate number data 27 is stored as a pair with the previous total weight allowable value data 24 or the load capacity allowable value data 25 and the tare weight value data 26. Alternatively, instead of the vehicle plate number data 27, only the inter-axle distance data 28 may be stored as a pair with the previous total weight allowable value data 24 or the load capacity allowable value data 25 and the tare weight value data 26. Good.
Reference numeral 29 denotes an image pickup apparatus. The image pickup apparatus 29 reads a vehicle plate number displayed on the license plate of the vehicle to be measured, and transmits the image signal to the calculation unit 9.
The lamp 22 is turned on in the process of calculating the weight of the vehicle to be measured in the calculation unit 9, and suppresses the next vehicle to be measured from entering the vehicle weight measuring device 1. For example, when calculating the weight, the red lamp is turned on. When the calculation of the weight is completed and the next vehicle under test is allowed to enter, the lamp of a different color is turned on so that the blue lamp is turned on. It may be.
The image signal from the imaging device 29 and the data stored in the database 23 are used for identifying the vehicle under measurement and for evaluating whether or not the measured total weight is within an allowable value. Will be described later.

Next, a measuring method of the vehicle weight measuring device will be described with reference to FIGS.
First, data stored in the memory 12 will be described with reference to FIG. The memory 12 stores in advance various characteristic values calculated by the calculation unit 9 from the load detection characteristics obtained by measuring a plurality of known loads in the desired load range using the first load cells 5a and 5b. .
FIG. 2 is a graph showing the load detection characteristics of known loads detected by the first load cells 5a and 5b of the vehicle weight measuring device according to the present embodiment.
In FIG. 2, the load detection characteristics 13, 14, and 15 all start measurement, and the load W increases rapidly in a short time, and thereafter, constant load values Wa ₁ , Wa ₂ , and Wa ₃ are respectively obtained. Show. The calculation unit 9 measures the time when the load starts to show a constant value, and defines this time as the required detection time ta. The required detection time ta is ta ₁ <ta ₂ <ta ₃ , and shows a tendency to decrease as the load increases. Then, a load increase gradient of each load detection characteristic used to calculate a true load of an unknown measurement target described later (hereinafter, the load increase gradient in the load detection characteristic of the known load is referred to as a second gradient). .) Is determined, and the load at the load calculation time tk is read as the calculation load Wk.
In the present embodiment, the longer the load W, the shorter the required time for detection. However, depending on the characteristics of the load cell, this may not always be the case.

The load calculation time tk is a fixed value and needs to be set to a time shorter than the minimum value of the required detection time ta measured within a preset load range.
The reason for this will be described with reference to FIG. Consider a case where the load calculation time tk is set to a time longer than the minimum value of the detection required time ta. For example, in FIG. 2, the load calculation time tk is set between ta ₁ and ta ₂ . In such a case, in the load detection characteristic 14, since the calculation load Wk exists in the middle of the increase of the load, the second gradient can be calculated accurately. On the other hand, the load detection characteristics 13, since the calculation load Wk is already taking a constant value matches the load Wa _1, becomes a gentle slope than the second gradient true, true second The gradient cannot be calculated.
In the memory 12, such characteristic values are collectively stored in a data table-like data structure as shown in Table 1 so as to be readable.

In Table 1, Wa is a load value (ton), ta is a detection required time (second), tk is a load calculation time (second), Wk is a calculation load (ton), and Wk / tk is a second gradient (ton / ton). Second).
In the present embodiment, the measurable load range is 1 to 10 tons, and within this load range, the required detection time ta is measured, and the time is shorter than the minimum value (0.5 seconds) of the required detection time ta. 0.4 seconds is determined as the load calculation time tk, the calculation load Wk at the load calculation time tk is measured, and the second gradient Wk / tk is calculated. The second gradient Wk / tk does not necessarily have to be calculated and stored, and the calculation unit may read and calculate the load calculation time tk and the calculation load Wk stored in advance at any time.

Next, the load detected by the second load cells 6a and 6b will be described with reference to FIG.
FIG. 3 is a graph showing the load detection characteristics detected by the pair of second load cells 6a and 6b of the vehicle weight measuring apparatus according to the present embodiment.
In FIG. 3, the load detection characteristic 16 shows two peaks at time t ₁ and time t ₂ . As described above, the pair of second load cell 6a, 6b are arranged at a distance from each other in longitudinal position of one of the traveling direction of the vehicle of the first load cell 5a, first appearing in the early times t ₁ the peak is a load that second load cell 6a of the side to be arranged in front positions of the first load cell 5a with respect to the traveling direction of the vehicle is detected, the second peak appearing at a later time t _2, the vehicle The load detected by the second load cell 6b on the side disposed at the rear position of the first load cell 5a with respect to the traveling direction. Thus, by measuring the time _{t 1} and time _{t 2} of these peaks in the arithmetic unit, these time differences delta _| calculating the, the time difference _{Δ | | t 1 -t 2 t} 1 -t 2 | vehicle is first The passage time passing through one load cell 5a shows substantially the same value, and can be treated as the passage time. When the pair of second load cells 6a and 6b are used in this way, the passing time of the vehicle wheel can be easily calculated. The time difference delta | t 1 _-t 2 _| to match as much as possible and the passage time, the pair of second load cell 6a, 6b, it is desirable to place as close as possible to the first load cell 5a.

Next, a measurement result of an unknown load measurement target will be described with reference to FIGS. 4 and 5.
FIG. 4 is a graph showing the load detection characteristics detected by the first load cells 5a and 5b when the passing time of the measurement vehicle is slow in the vehicle weight measurement device according to the present embodiment.
In FIG. 4, in the load detection characteristic 17, the load W increases immediately after the start of measurement, then shows a constant load value Wx during the detection required time period tax to tx, and rapidly decreases after the time period tx. ing. Here, the measurement vehicle passes through the first load cells 5a and 5b between the time t is 0 and the time tx on the horizontal axis, and the time tx is the passage time. Since the load detection characteristic 17 shows a constant load value Wx as in the load detection characteristic shown in FIG. 2 described above, the calculation unit 9 can calculate the load value Wx at an arbitrary time between time tax and tx. The true load can be obtained by reading. If the calculation unit 9 can recognize the portion where the load detection characteristic changes, that is, the inflection point of the characteristic, the detection required time tax and the passage time tx can be determined in FIG. Alternatively, the load Wx at the passage time tx can be read. In this case, since the calculation of the passage time using the pair of second load cells 6a and 6b is not necessary, the pair of second load cells 6a and 6b may not be installed.

On the other hand, when the passage time tx is calculated using the pair of second load cells 6a and 6b, the calculation process in the calculation unit 9 becomes simpler. In this case, tamax shown on the horizontal axis of FIG. 4 is used. tamax is the maximum value of the required detection time ta shown in Table 1 described above and stored in the memory. In Table 1, tamax = 2.0 seconds. First, the calculation unit 9 compares the passage time tx measured by the pair of second load cells 6a and 6b with the required detection time tamax. When the passage time tx is longer than the required detection time tamax, the measurement having a time necessary for detecting the true load is performed in the measurement load range of the vehicle weight measurement device 1 in which the measurement is set in advance. This means that the calculation unit 9 can easily obtain the true load simply by reading the load at the passage time tx. Therefore, the calculation unit can omit the calculation process for recognizing the inflection point of the load detection characteristic 17 as described above.
However, this is established when the passage time tx is sufficiently long, that is, when the passage time tx is longer than tamax, and it is necessary to consider the case where the passage time tx is shorter than tamax as follows.

Next, FIG. 5 is a graph showing the load detection characteristics detected by the first load cells 5a and 5b when the passing time of the measurement vehicle is fast in the vehicle weight measurement device according to the present embodiment.
In FIG. 5, in the load detection characteristic 18, the load W becomes maximum at Wx after the start of measurement and immediately decreases thereafter. Further, in the load detection characteristic 18, the measurement vehicle passes through the first load cells 5a and 5b from time t to time tx on the horizontal axis, and the passage time is tx. The passage time tx may be read from the load detection characteristic 18 in the calculation unit, or may be measured by the pair of second load cells 6a and 6b described above.
On the other hand, a load detection characteristic 19 indicated by a broken line corresponds to a true load stored in a memory and measured in advance when the known load is the load detection characteristic 18, and is constant after the detection required time ta. That is, the true load Wa is shown. Comparing these two load detection characteristics, it can be seen that in the load detection characteristic 18, the passage time tx does not reach the required detection time ta, and the maximum load Wx does not indicate the true load Wa. That is, when the passage time tx is shorter than the required detection time tamax, the true load Wa cannot be obtained even if the load Wx at the passage time tx is read.
However, when comparing the load detection characteristic 18 and the load detection characteristic 19, it can be seen that the increase gradient of the load at the beginning of the measurement is equal in any load detection characteristic. Therefore, the calculation unit 9 calculates an increase gradient of the load Wxk of the load detection characteristic 18 at the load calculation time tk (hereinafter, an increase gradient of the load to be measured with respect to the load calculation time tk is referred to as a first gradient). If the information of the load detection characteristic 19 having the second gradient that substantially matches the obtained first gradient is extracted from the memory 12, the true load W can be determined. That is, since the true load W is determined when the first gradient is determined, the true load W is expressed by the following equation.

Here, the calculation of the first gradient uses the load calculation time tk described above and the load Wxk in the load detection characteristic 18 at the load calculation time tk.
Further, as shown in Table 1 above, the calculation load Wk with respect to the load calculation time tk is measured at a known load Wa and can be expressed as Wa = f (Wk / tk). Can be obtained as an empirical formula. For example, a linear function or a quadratic function can be appropriately determined by a least square method or the like, but there is no particular limitation on whether to use a linear function, a quadratic function, or other functional forms.

Next, a processing method in the calculation unit will be described with reference to FIGS.
FIG. 6 is a flowchart for explaining a vehicle weight calculation method in the vehicle weight measurement device according to the present embodiment.
In FIG. 6, the calculation unit first measures and calculates the vehicle passage time tx in step S1. As described above, the passage time tx is obtained by measuring the time difference between the two load peaks detected by the pair of second load cells 6a and 6b and processing the difference between the two load peaks 6a and 6b. The arithmetic unit 9 receives the electrical signals from the pair of second load cells 6a and 6b appropriately processed by the amplifier 7 and the A / D converter 8, detects two peaks from the load detection characteristics, and passes the passage time. tx is calculated and stored in the memory 12 as data.
Alternatively, the inflection point from the load detection characteristic detected by the first load cells 5a and 5b is measured, and after this is digitally converted by the A / D converter 8, it is analyzed and read by the arithmetic unit 9, The time may be the transit time tx.

  Next, in step S2, the calculation unit 9 compares the passage time tx and the maximum value tamax of the required detection time ta. In step S2, the calculation unit 9 reads the maximum value tamax and the passage time tx in the detection required time ta stored in the memory 12, and compares it with the passage time tx.

  If the passage time tx is equal to or greater than the maximum detection time tamax, the process proceeds to step S3. In step S <b> 3, the calculation unit 9 calculates the true load W according to the equation (2), stores it in the memory 12, and ends the load W calculation process.

  On the other hand, if the passage time tx is smaller than the maximum required time tamax, the process proceeds to step S4. In step S4, as described above, the calculation unit 9 reads the load Wxk at the load calculation time tk, calculates the true load W by the above equation (1), and stores it in the memory 12. The load W calculation process is then terminated.

  The obtained load W is calculated based on the measurement result of one of the pair of first load cells 5a, 5b, and step S1 is performed for the other first load cell. The same calculation process from step S4 to step S4 is performed. However, since the transit time tx passing through the pair of first load cells 5a and 5b is the same in any of the first load cells, in the arithmetic processing for the other first load cell 5a or 5b, in step S1 The calculation of the passage time tx is omitted, and the passage time tx calculated for one of the first load cells 5a and 5b is stored in the memory 12, and the stored passage time tx is read out. .

Next, FIG. 7 is a process diagram showing a process of calculating the vehicle weight in the vehicle weight measuring apparatus according to the present embodiment.
In the vehicle weight measuring device 1, the left and right wheels are loaded on the pair of first load cells 5a and 5b installed, and the load Wr applied from the right wheel and the load Wl applied from the left wheel are obtained. In general, the vehicle has at least two pairs of front and rear axles, and the vehicle weight measuring apparatus 1 measures the load applied from the front wheel and subsequently measures the load applied from the rear wheel.
Therefore, in FIG. 7, in step S1, first, the front wheel uniaxial weight is calculated. The calculation unit 9 reads the loads Wr and Wl applied from the left and right front wheels stored in the memory 12, adds them, and calculates the total load applied from the pair of left and right front wheels. This total value is the front wheel uniaxial weight.
Next, in step S2, the rear wheel uniaxial weight is calculated. As in the case of step S1, the calculation unit 9 reads the loads Wr and Wl applied from the left and right rear wheels stored in the memory 12, adds them, and sums the loads applied from the left and right rear wheels. Is calculated. This total value is the rear wheel uniaxial weight.
Finally, in step S3, the total weight is calculated. In this step S3, the total weight is calculated by adding the front wheel uniaxial weight and the rear wheel uniaxial weight calculated in step S1 and step S2.
When the vehicle has two or more pairs of axles, the uniaxial weight for each axle is calculated, and all the calculated uniaxial weights are added to obtain the total weight.
In the present embodiment, the uniaxial weight is calculated by measuring and adding the loads Wr and Wl of the left and right wheels, but only one of the loads is measured and calculated, and this is doubled. It goes without saying that simplification may be performed, but it is desirable to perform the calculation independently in order to improve accuracy.

Although the total weight is calculated in this way, in the process of calculating the total weight, the calculation unit 9 is operating, and it is sufficient that the operation is completed in a short time. In the case where the calculation unit 9 is operating even after a while after passing through the measuring device 1, it is necessary to prevent the next vehicle to be measured from entering the vehicle weight measuring device 1. Therefore, at least from the front wheel uniaxial weight calculation step of step S1 shown in FIG. 7 to the total weight calculation step of step S3, the lamp 22 shown in FIG. Alternatively, it should be blinking.
Further, it may be set so that the lighting of the lamp 22 is finished or the lighting color is changed when the total weight calculating step of Step S3 is completed or when a predetermined time has elapsed from that time. . In that case, for example, when the load is first detected in either the first load cell 5a, 5b or the second load cell 6a, 6b, the lighting is started or the lighting color is changed. It is possible to separate the timing for suppressing entry and the timing for prompting.
As the lighting color, for example, when the load is first detected in either the first load cell 5a, 5b or the second load cell 6a, 6b, the lighting color is red, and the total weight calculation process in step S3 is completed. By setting blue to light up at the time or when a predetermined time has elapsed since that time, entry is prohibited when red, and entry is permitted when blue It becomes possible.

Next, using the imaging device 29 shown in FIG. 1, whether or not the calculated total weight is within the total weight allowable value data 24 stored in the database 23 in advance, or the calculated load amount value is calculated. Is evaluated whether it is within the allowable load amount data 25 stored in the database 23, and a method for generating an alarm when the allowable value is exceeded will be described.
For the description, FIG. 8 and FIG. 9 will be referred to in addition to FIG.
An imaging device 29 shown in FIG. 1 is provided in the vicinity of the loading platforms 2a and 2b, and captures the number plate of the vehicle to be measured entering the vehicle weight measuring device 1, and displays the vehicle plate displayed on the vehicle plate. The number can be imaged. The vehicle plate number imaged by the imaging device 29 is transmitted to the calculation unit 9, and the vehicle plate number is recognized by image analysis. This process is step S1 shown in FIG.
In the calculation unit 9, the calculation unit 9 searches the vehicle plate number data 27 by accessing the database 23 using the read vehicle plate number as a key. The total weight allowable value data 24 including the vehicle plate number data 27 coinciding with the vehicle plate number read by the calculation unit 9 is extracted (step S2).
Further, as described in FIG. 7, the total weight is calculated (step S3), and the calculated total weight is compared with the total weight allowable value (total weight allowable value data 24) (step S4). Steps S2 to S4 are all operations in the calculation unit 9.
When the total weight exceeds the total weight allowable value, the calculation unit 9 generates an alarm signal, and this alarm signal is received by the alarm means 11 and issues an alarm (step S5).
In this figure, step S3 for calculating the total weight is provided after step S1 and step S2. However, these steps may be reversed to execute step S1 and step S2 after step S3. There is no problem.

Next, referring to FIG. 9, a case will be described in which it is evaluated whether the loaded weight value exceeds the allowable value, not whether or not the total weight exceeds the allowable value.
FIG. 8 and step S1 are the same, but step S2 and subsequent steps are different. In FIG. 9, using the read vehicle plate number as a key, the calculation unit 9 accesses the database 23 and searches the vehicle plate number data 27. The tare weight value data 26 including the vehicle plate number data 27 that matches the vehicle plate number read by the calculation unit 9 is extracted (step S2).
Next, similarly, the allowable load amount data 25 including the vehicle plate number data 27 that matches the vehicle plate number read by the calculation unit 9 is extracted (step S3).
Thereafter, the total weight is calculated as described with reference to FIG. 7 (step S4), and the previously extracted tare weight value (tare weight value data 26) is subtracted from the calculated total weight to obtain the loaded load value. Is calculated (step S5), and the calculated applied load value is compared with the applied load amount allowable value (applied load amount allowable value data 25) (step S6). Steps S2 to S6 are all operations in the calculation unit 9.
When the applied load amount value exceeds the allowable load amount value, the calculation unit 9 generates an alarm signal, which is received by the alarm means 11 and issues an alarm (step S7).
In this figure, step S4 for calculating the total weight is provided after step S1 to step S3. However, these steps may be reversed to execute step S1 to step S3 after step S4. There is no problem. However, it is needless to say that at least step S5 needs to be a post-step of steps S2 and S4 because the load value can be calculated only after the calculation of the total weight and the extraction of the tare weight value.

Next, referring to FIG. 10 and FIG. 11, when the alarm is generated by evaluating the total weight and the loaded amount as described with reference to FIG. 8 and FIG. 9 without providing the imaging device 29. A description will be added about the form.
Since step S6 and subsequent steps in FIG. 10 correspond to step S3 and subsequent steps in FIG. 8, the subsequent description is omitted.
In FIG. 10, each load peak time (time point) detected by the second load cells 6a and 6b is measured by the calculation unit 9, and the time difference is calculated (step S1). If the distance between 6b is approximately equal to the width of the first load cell 5a, the width may be used, but the traveling speed of the vehicle to be measured is calculated (step S2).
In the present embodiment, the time difference described in step S1 is calculated using the second load cells 6a and 6b. However, the widths of the first load cells 5a and 5b are sufficient, and the first load cells 5a and 5b If the time difference from end to end of 5b can be calculated, the time difference may be used.
In step S3, it is desirable to select the axle of the vehicle to be measured, particularly the front axle and the rear axle, and calculate the passage time between the axles. In many cases, the number of axles of the vehicle is the front wheel 1, the rear wheel 1 or 2, but other cases may be used. However, if it is considered to calculate the passing time while maintaining a certain degree of accuracy, the axles on the front wheels It is desirable to select the axle on the rear wheel and calculate the transit time between the axles.
The calculation of the passage time between the axles is performed by calculating the peak of the load detected when the wheel of the corresponding front axle passes through any one of the first load cells 5a, 5b or the second load cells 6a, 6b. And the time difference between the load peak time (time point) detected when the wheel of the corresponding rear axle passes.
Since the vehicle speed has already been calculated in step S2, the inter-axle distance is calculated using the vehicle speed and the inter-axle passage time calculated in step S3 (step S4).
Using the calculated inter-axle distance as a key, the calculation unit 9 accesses the database 23 and searches the inter-axle distance data 28. The total weight allowable value data 24 including the inter-axle distance data 28 coinciding with the inter-axle distance calculated by the calculation unit 9 is extracted (step S5).
The subsequent steps are the same as those already described with reference to FIG. In addition, it becomes the operation | movement which the calculating part 9 performs from step S1 to step S7.

Next, with reference to FIG. 11, a case will be described in which it is evaluated whether the loaded weight value exceeds the allowable value, not whether or not the total weight exceeds the allowable value. Since step S7 and subsequent steps in FIG. 11 correspond to step S4 and subsequent steps in FIG. 9, the subsequent description is omitted.
Further, steps S1 to S4 in FIG. 11 are the same as those in the embodiment described with reference to FIG.
In step S5, the computing unit 9 accesses the database 23 and searches the inter-axle distance data 28 using the calculated inter-axle distance as a key. Tare weight value data 26 including axle distance data 28 that matches the axle distance calculated by the calculation unit 9 is extracted.
Next, similarly, the allowable load amount data 25 including the inter-axle distance data 28 that matches the inter-axle distance calculated by the calculation unit 9 is extracted (step S6).
Step S7 and subsequent steps are the same as those described with reference to FIG.
This operation is performed by the calculation unit 9 from step S1 to step S9 in FIG.

As described above, in the embodiment described with reference to FIGS. 8 to 11, the total weight or the allowable value for the load value is stored in the database in advance, and the total weight or the weight measured using the vehicle weight measuring device 1 is stored. Since it can be automatically evaluated as it is using the loaded load value, it is not necessary to evaluate the relationship with the allowable value after obtaining the allowable value while checking the vehicle type etc.・ Evaluation is possible.
In addition, when searching for an allowable value that is a base for evaluation, it is based on information obtained by using the amount calculated based on the load measured in the present embodiment or an image captured on site. Once the correct data is stored in the database, it is possible to increase the accuracy and avoid erroneous evaluation.

Finally, FIG. 12 is a flowchart for explaining an alarm generation method in the vehicle weight measuring apparatus according to the present embodiment.
In FIG. 12, step S1 calculates the difference between the loads W applied from the left and right wheels. In this step S1, the load Wr applied from the right wheel and the load Wl applied from the left wheel, which are calculated based on the measurement results of the pair of first load cells 5a, 5b and stored in the memory 12, are read out. ΔW is calculated. Instead of this difference ΔW, for example, a value obtained by dividing the difference ΔW by the value indicating the maximum value of the load Wr and the load Wl may be used.
In step S2, ΔW is compared with a reference value. The reference value can be arbitrarily set, and a preset value is stored in the memory 12. The calculation unit 9 reads the reference value stored in the memory 12 and compares it with ΔW calculated in step S1.

If ΔW is larger than the reference value, the process proceeds to step S3. In step S3, an alarm signal is generated. In this case, an alarm signal is generated in the calculation unit 9 and transmitted to the display unit 10. When a warning signal is received by the display unit 10, a warning display is displayed on the display unit. Alternatively, the alarm means 11 receives the alarm signal generated in the arithmetic unit 9 and operates so as to generate an alarm. If ΔW is larger than the reference value, it is considered that one of the wheels is not correctly loaded on the first load cell 5a, 5b. Can recognize gender. The alarm means 11 is not particularly limited, and for example, a sound such as a buzzer can be generated, a warning display can be displayed, or both can be performed. When the alarm is generated, the calculation process is terminated.
The calculation process is also terminated when ΔW is smaller than the reference value.

  As described above, the present invention described in claims 1 to 4 can provide a vehicle weight measuring device capable of accurately measuring the weight of a vehicle in a traveling state with a simple configuration, and can be used at a construction site or at a high speed. It can be used in facilities that require weighing, such as roads.

It is a block diagram of the vehicle weight measuring apparatus which concerns on this Embodiment of this invention. It is a graph which shows the load detection characteristic of the known load detected by the 1st load cell of the vehicle weight measuring apparatus which concerns on this Embodiment. It is a graph which shows the load detection characteristic measured by a pair of 2nd load cell of the vehicle weight measuring apparatus which concerns on this Embodiment. It is a graph which shows the load detection characteristic of the unknown load detected by the 1st load cell when the passage time is late in the vehicle weight measuring device concerning this embodiment. It is a graph which shows the load detection characteristic of the unknown load detected by the 1st load cell when the passage time is quick in the vehicle weight measuring apparatus which concerns on this Embodiment. It is a flowchart for demonstrating the calculation method of a vehicle weight in the vehicle weight measuring apparatus which concerns on this Embodiment. It is process drawing which shows the process of calculating the vehicle weight in the vehicle weight measuring apparatus which concerns on this Embodiment. It is a flowchart for demonstrating the method which reads the vehicle plate number in the vehicle weight measuring device which concerns on this Embodiment, evaluates a total weight based on a total weight allowable value, and generates an alarm. It is a flowchart for demonstrating the method which reads a vehicle plate number in the vehicle weight measuring device which concerns on this Embodiment, evaluates a load amount based on a load value allowable value, and generates an alarm. It is a flowchart for demonstrating the method of calculating the distance between axle shafts in the vehicle weight measuring apparatus which concerns on this Embodiment, evaluating a total weight based on a total weight allowable value, and generating a warning. It is a flowchart for demonstrating the method of calculating the distance between axle shafts in the vehicle weight measuring apparatus which concerns on this Embodiment, evaluating a loaded load based on an allowable load value, and generating a warning. It is a flowchart for demonstrating the alarm generation method in the vehicle weight measuring apparatus which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle weight measuring apparatus 2a, 2b ... Loading platform 3a, 3b, 4a, 4b ... Slope plate 5a, 5b ... 1st load cell 6a, 6b ... 2nd load cell 7 ... Amplifier 8 ... A / D converter 9 ... Calculation unit 10 ... Display unit 11 ... Alarm means 12 ... Memory 13 to 19 ... Load detection characteristics 21 ... Printer 22 ... Lamp 23 ... Database 24 ... Total weight allowable value data 25 ... Load capacity allowable value data 26 ... Tare weight value data 27 ... Vehicle plate number data 28 ... Axle distance data 29 ... Imaging device

Claims (10)

A pair of first load cell portions that are respectively provided on a pair of loading platforms capable of loading a pair of left and right wheels of the vehicle and detect a load applied to the pair of loading platforms and output them as electric signals;
At least one of the pair of loading platforms, a pair of first mounting units that are spaced apart from the front and back of the first load cell portion in the traveling direction of the vehicle, respectively, detect the load applied to the loading platform, and output them as electrical signals. Two load cell sections;
A calculation unit that receives an electrical signal from the first load cell unit and calculates respective loads applied from a pair of left and right wheels of the vehicle;
A display unit for displaying the load calculated by the calculation unit;
Regarding the load detection characteristics of the first load cell portion, a desired load, a time required for detecting the desired load (hereinafter referred to as a detection required time), and a preset value shorter than the minimum value of the detection required time are set in advance. A vehicle weight measuring device having a load calculation time and a storage unit for storing data relating to a load at the time of the load calculation time (hereinafter referred to as a calculation load),
The calculation unit receives an electrical signal from the pair of second load cell units, calculates a passing time of the wheel of the vehicle, and calculates a maximum value of the passing time and a required detection time stored in the storage unit. In comparison, when the passage time is short, an increase gradient of the load detected by the first load cell unit during the load calculation time during the passage time (hereinafter referred to as the first gradient) is calculated. Compared with the increase gradient of the calculation load detected in the load calculation time (hereinafter referred to as the second gradient), the load related to the second gradient that substantially matches the first gradient. And a vehicle weight measuring device that calculates the load. A pair of load cell portions that are respectively provided on a pair of loading platforms capable of loading a pair of left and right wheels of the vehicle and detect a load applied to the pair of loading platforms and output them as electric signals;
A calculation unit that receives an electrical signal from at least one of the load cell units and calculates each load applied from a pair of left and right wheels of the vehicle;
A display unit for displaying the load calculated by the calculation unit;
Regarding the load detection characteristics of the load cell portion, a desired load, a time required for detection of the desired load (hereinafter referred to as detection required time), and a load set in advance shorter than the minimum value of the detection required time A vehicle weight measuring device having a calculation time and a storage unit for storing data relating to a load when the load calculation time elapses (hereinafter referred to as a calculation load),
The calculation unit receives an electric signal from the load cell unit, calculates a passing time of the wheel of the vehicle, compares the passing time with a maximum value of a required detection time stored in the storage unit, When the passage time is short, an increase gradient (hereinafter referred to as a first gradient) of the load detected in the load cell unit during the load calculation time during the passage time is calculated and detected during the load calculation time. The load related to the second gradient, which substantially matches the first gradient, is calculated as a load compared to the increase gradient of the calculation load (hereinafter referred to as the second gradient). Vehicle weight measuring device.   The calculation unit calculates a uniaxial weight by adding each load applied from a pair of left and right wheels of the vehicle, and adds a plurality of uniaxial weights obtained for a plurality of axles installed in the vehicle. The vehicle weight measuring device according to claim 1, wherein the weight is calculated.   The calculation unit calculates a difference between the loads applied from the pair of left and right wheels of the vehicle, and outputs a warning signal when the difference calculated by comparing with a preset reference value is larger than the reference value. The vehicle weight measuring device according to any one of claims 1 to 3, wherein the display unit includes an alarm unit that receives the alarm signal and generates an alarm. In the vehicle weight measuring device according to claim 3 or 4,
A plate number reading device that images the vehicle license plate and reads the vehicle plate number;
A second storage unit that stores in advance the total weight allowable value of the vehicle to be measured for vehicle weight and the vehicle plate number described in the license plate of the vehicle,
The calculation unit searches the second storage unit using the vehicle plate number read by the plate number reading device as a key, extracts the total weight allowable value, and compares the total weight with the total weight allowable value And if the total weight is greater than the total weight tolerance, provided as generating an alarm signal,
The vehicle weight measuring device further comprises second alarm means for receiving the alarm signal and generating an alarm. The tare weight value and the load capacity allowance value of the vehicle are stored in association with the vehicle plate number described on the license plate of the vehicle, instead of the total weight allowance value,
The calculation unit compares the loaded load value obtained by subtracting the tare weight value from the measured total weight of the vehicle and the previously described allowable load amount, and the previously described load amount value is greater than the previously described allowable load amount value. 6. The vehicle weight measuring device according to claim 5, wherein an alarm signal is generated when the vehicle weight is large. A third storage unit that stores in advance the first axle and the second axle distance of the vehicle to be subjected to vehicle weight measurement and the total weight allowable value of the vehicle in association with each other;
The arithmetic unit calculates a uniaxial weight by adding respective loads applied from a pair of left and right wheels related to at least the first and second axles of the vehicle, and the first and second axles installed in the vehicle The total weight is calculated by adding a plurality of uniaxial weights obtained for axles including
Receiving electrical signals from the pair of second load cell parts to calculate the passing time of the wheels of the vehicle, calculating the speed of the vehicle from the passing time and the distance between the pair of second load cell parts,
An electric signal from any one of the pair of first load cell units or the pair of second load cell units is received, and the second axle from the left or right wheel of the first axle of the vehicle Calculate the passing time between the wheels up to one of the left and right wheels,
From the passing time between the wheels and the speed of the vehicle, the distance between the first axle and the second axle of the vehicle is calculated,
Using the distance between the first axle and the second axle as a key, the third storage unit is searched to extract the total weight allowable value of the vehicle, and the total weight and the total weight allowable value are compared. And generating a warning signal if the total weight is greater than the total weight tolerance,
The vehicle weight measuring device according to claim 1, further comprising second alarm means for receiving the alarm signal and generating an alarm. A third storage unit that stores in advance the first axle and the second axle distance of the vehicle to be subjected to vehicle weight measurement and the total weight allowable value of the vehicle in association with each other;
The arithmetic unit calculates a uniaxial weight by adding respective loads applied from a pair of left and right wheels related to at least the first and second axles of the vehicle, and the first and second axles installed in the vehicle The total weight is calculated by adding a plurality of uniaxial weights obtained for axles including
Receiving an electrical signal from the at least one load cell unit to calculate the passing time of the wheels of the vehicle, calculating the speed of the vehicle from the passing time and the length of the load cell unit in the traveling direction of the vehicle,
An electric signal from one of the load cell portions of the pair of load cell portions is received, and between the wheels from the left or right wheel of the first axle of the vehicle to the right or left wheel of the second axle Calculate the transit time,
From the passing time between the wheels and the speed of the vehicle, the distance between the first axle and the second axle of the vehicle is calculated,
Using the distance between the first axle and the second axle as a key, the third storage unit is searched to extract the total weight allowable value of the vehicle, and the total weight and the total weight allowable value are compared. And generating a warning signal if the total weight is greater than the total weight tolerance,
The vehicle weight measuring device according to claim 2, further comprising second alarm means for receiving the alarm signal and generating an alarm. The tare weight value and the load capacity allowance value of the vehicle are stored in correspondence with the distance between the first axle and the second axle of the vehicle instead of the total weight allowance,
The calculation unit compares the loaded load value obtained by subtracting the tare weight value from the measured total weight of the vehicle and the previously described allowable load amount, and the previously described load amount value is greater than the previously described allowable load amount value. The vehicle weight measuring device according to claim 7 or 8, wherein an alarm signal is generated when the vehicle weight is large. The calculation unit adds a plurality of uniaxial weights obtained for a plurality of axles installed in the vehicle and a process of calculating a uniaxial weight by adding respective loads applied from a pair of left and right wheels of the vehicle. A waiting signal is generated at the time from the start to the end of the process for obtaining the total weight or the time from the start to the end of these processes plus a predetermined time,
The vehicle weight measuring device according to any one of claims 3 to 9, further comprising light emitting means for receiving the waiting signal and generating light for indicating a waiting state.