JP5795204B2 - Vehicle measuring device - Google Patents

Description

  The present invention relates to a vehicle measurement device capable of measuring the weight of a vehicle mounted on a mounting and measuring the speed of the vehicle traveling on the mounting.

  Conventionally, in order to perform weight management of a load loaded on a vehicle, measurement of the load amount of the vehicle has been performed. The vehicle load amount is obtained by measuring the vehicle weight including the load using a vehicle weight measuring device and subtracting the weight of the vehicle registered in advance from the measured vehicle weight. For example, as shown in Patent Document 1, a vehicle weight measuring device having a platform that is dimensioned so that all the wheels of a vehicle can enter at the same time temporarily stops the vehicle on the platform, The measurement value obtained in a stable state after the disturbance is converged is measured as the vehicle weight.

  In recent years, an axle weight measuring device that measures the weight of an axle of a vehicle (also referred to as an axle weight) and the total weight of the vehicle is also common. Patent Document 2 discloses an axle weight measuring apparatus configured to measure the axle weight of a running vehicle and detect the speed or acceleration of the vehicle. The axle weight measuring device disclosed in Patent Document 2 includes first and second axle weight sensors arranged in the traveling direction of the vehicle, and the preceding axle (the axle that first passes over the sensor) is the first axle weight. The time required to pass between these axle load sensors (referred to as the passage time) is calculated from the time when the vehicle passes over the sensor and the time when the axle passes over the second axle load sensor. Based on the arrangement interval of the axle load sensors, the speed of the preceding axle is calculated as the speed of the vehicle.

JP-A-63-81220 JP 2009-216674 A

  In the vehicle weight measuring device having the platform as described in Patent Document 1, the upper surface of the platform is worn as the vehicle travels on the platform. The stopper bolt that regulates the load and the load cell that supports the platform and the foundation may be severely damaged. The extent of these damages is usually proportional to the number of measurements. However, when a messy driving such as a sudden stop or a sudden start is performed when the vehicle gets on or off the platform, the progress of the degree of damage is accelerated. Therefore, when the vehicle speed when getting on and off the platform exceeds a predetermined range, or when the acceleration of the vehicle is not within the predetermined range, the driving speed determined by the driver is protected and It is desirable to take measures such as recommending not to start suddenly. For this purpose, it is necessary to detect the speed and acceleration when the vehicle gets on and off the platform.

  By the way, the axle weight measuring device described in Patent Document 2 calculates the speed of the preceding axle using time lags when detection signals are output from a plurality of axle weight sensors. In other words, the vehicle speed detection method described in Patent Document 2 assumes that the vehicle runs through without stopping on the axle load sensor, and the preceding axle of the vehicle is on a plurality of axle load sensors. Only the speed of the vehicle passing through the vehicle at a constant speed can be detected correctly. Therefore, it is assumed that the technique described in Patent Document 2 is applied to a vehicle weight measuring device of a type that includes a platform on which all the axles of the vehicle can be placed and measures the weight by temporarily stopping the vehicle on the platform. However, the speed of the vehicle when the vehicle gets on and off the platform, the acceleration when the vehicle stops and starts on the platform, etc. cannot be detected.

  In view of the above, the present invention provides a vehicle measuring device including a platform on which an entire vehicle having a plurality of wheels can be placed, and a plurality of load detectors arranged to support the platform. And measuring either one or both of the speed and acceleration of the vehicle traveling on the platform.

  The vehicle measurement device according to the present invention includes a platform having a size capable of mounting all the wheels of the vehicle to be measured, and a plurality of loads that are arranged to support the table and detect a load applied to the platform. Load detectors and an indicator that performs calculations using detection outputs from the plurality of load detectors, the indicator based on loads detected by the plurality of load detectors. The weighing unit includes a weighing unit that calculates weight, and a speed calculation unit that calculates one or both of the speed and acceleration of the vehicle based on loads detected by the plurality of load detectors.

  The vehicle measuring device having the above-described configuration measures the weight of the vehicle on the platform based on the loads detected by the plurality of load detectors, and either one of the speed and acceleration of the vehicle traveling on the platform or Both can be measured. Therefore, it is possible to measure either one or both of the speed and acceleration of the vehicle traveling on the platform using a configuration for measuring the weight of the vehicle without providing a special speed sensor or the like. Furthermore, since loads detected by a plurality of load detectors are used, it is possible to measure either or both of speed and acceleration regardless of the number of axles of the vehicle on the platform. Therefore, it is possible to measure the speed of the vehicle in the process of getting on and off the platform, the acceleration when the vehicle stops and starts on the platform, and the like.

  In the vehicle measurement device, the speed calculation unit obtains a displacement amount of a position of a reference point attached to the vehicle based on loads detected by the plurality of load detectors, and based on the displacement amount, Either one or both of speed and acceleration may be calculated. In the vehicle measurement device, the reference point may be the front axle or the center of the rear axle of the vehicle.

  In the vehicle measurement device, the plurality of load detectors are arranged in the preceding table with one or more rear load detectors arranged behind the front and rear center in the traveling direction of the vehicle, and the progression in the preceding table. One or a plurality of front load detectors arranged in front of the front and rear center in the direction, and the weighing unit and the speed calculation unit are sums of loads detected by the one or more rear load detectors. Preferably, the plurality of load detectors and the indicator are connected so that the sum of the loads detected by the one or more front load detectors can be used independently of each other. With this configuration, the indicator calculates the position of the reference point of the vehicle traveling on the platform by using the load detected by the rear load detector and the load detected by the front load detector, respectively. be able to.

  In the vehicle measurement device, each of the plurality of load detectors may be a digital load cell. This makes it easy to achieve a configuration in which the sum of the loads detected by one or more rear load detectors and the sum of the loads detected by one or more front load detectors can be used independently. can do.

  In the vehicle measurement device, the indicator stores a plurality of calculation formulas according to the number of axles of the vehicle and the situation of the axles of the vehicle on the table, and the speed calculation unit includes the plurality of calculation formulas. Of the calculation formulas, one of the calculation formulas is selectively used according to the number of axles of the vehicle and the state of the axles of the vehicle on the table, and either one of the speed and acceleration of the vehicle or It may be configured to calculate both.

  In the vehicle measurement apparatus, the speed calculation unit includes a load applied to the rear side of the front and rear center of the vehicle in the traveling direction of the table, a load applied to the front side of the front and rear center of the table in the traveling direction, and the vehicle Distance between axles, or in addition to these, the load detector disposed on the rear side of the front-rear center in the traveling direction of the table and the load disposed on the front side of the front-rear center of the front table in the traveling direction. One or both of the speed and acceleration of the vehicle may be calculated using a separation distance from the detector.

  In the vehicle measurement device, the indicator compares the vehicle speed and acceleration calculated by the speed calculation unit with one or both of the vehicle speed and a predetermined regulated speed or a predetermined regulated acceleration. It is preferable to further include a vehicle speed monitoring unit that detects overspeed, sudden start and sudden stop on the table. Thereby, either one or both of the speed and acceleration measured by the vehicle measurement device can be used effectively. For example, the detected overspeed and sudden stop can be used to issue warnings for messy driving in the process of getting on and off the vehicle.

  According to the present invention, in a vehicle measuring device including a platform on which an entire vehicle having a plurality of wheels can be placed and a plurality of load detectors arranged to support the platform, the weight of the vehicle is measured. It is possible to measure either one or both of the speed and acceleration of the vehicle traveling on the platform by using a configuration for measuring the weight of the vehicle without providing a special speed sensor or the like. it can. Furthermore, since loads detected by a plurality of load detectors are used, it is possible to measure either or both of speed and acceleration regardless of the number of axles of the vehicle on the platform. Therefore, it is possible to detect the speed of the vehicle in the process of getting on and off the platform, the acceleration when the vehicle stops and starts on the platform, and the like.

1 is a side view schematically showing a configuration of a vehicle measurement device according to an embodiment of the present invention. It is a top view which shows roughly the structure of a vehicle measuring device similarly. It is a block diagram which shows the structure of an indicator. It is a conceptual diagram which shows an example of the layout of the vehicle information memorize | stored in a vehicle information database. It is a graph which shows an example of a time-sequential change of the detection total amount by a vehicle measuring device. It is a flowchart which shows the schematic flow of operation | movement of a vehicle measuring device. It is a figure explaining the calculation method of a reference position when the 1st axle of vehicles with two axles exists on a mount. It is a figure explaining the calculation method of a reference position when all the axles of the vehicle of the number of axles 2 are on a mounting base. It is a figure explaining the calculation method of a reference position when the 2nd axle of vehicles with two axles exists on a mount. It is a graph which shows an example of the relationship between a rear side weight and the travel distance of a vehicle. It is a figure explaining the calculation method of a reference position when all the axles of the vehicle of the number of axles 3 are on a mounting base. It is a figure explaining the calculation method of a reference position when the 2nd axle and the 3rd axle of vehicles with the number of axles 3 are on a mount.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

(Configuration example of the vehicle measurement device 10)
FIG. 1 is a side view schematically showing the configuration of a vehicle measuring device according to an embodiment of the present invention, FIG. 2 is a plan view schematically showing the configuration of the vehicle measuring device, and FIG. 3 shows the configuration of an indicator. It is a block diagram. As shown in FIGS. 1 and 2, a vehicle measuring device 10 according to an embodiment of the present invention includes a weighing scale 1 and an indicator connected to the weighing scale 1 so as to be communicable with a wired or wireless communication means 5. 8 and.

  The weigh scale 1 includes a platform 2 on which a vehicle 4 that is a measurement target for measuring the weight is mounted, and a plurality of load cells 3 a arranged to support the platform 2 in order to detect a load applied to the platform 2. , 3b, 3c, 3d. The weighing scale 1 according to the present embodiment includes four load cells 3a, 3b, 3c, and 3d (load detectors) arranged at the four corners below the platform 2. The platform 2 has a dimension that allows all the wheels 41, 42, 43, 44 of the vehicle 4 to be placed simultaneously so that the entire vehicle 4 can be placed. The platform 2 is disposed in a pit formed by digging down the road surface so that the upper surface thereof is substantially flush with the road surface. The vehicle 4 according to the present embodiment is a two-axle vehicle having a first axle 4f and a second axle 4b. However, the vehicle 4 that is the measurement target of the vehicle measurement device 10 may of course be a vehicle having three or more axles. Even when measuring the weight of a vehicle having three or more axles, the size of the platform 2 is determined so that all the wheels included in the vehicle 4 can be placed simultaneously.

Four load cells 3a, 3b, 3c, 3d is a rear K _a of about a substantially later than the center side (in the direction indicated by the arrow 99 in FIG. 1) traveling direction of the vehicle 4 in the platform 2, the front side of the front row K It is divided and divided into _b . Back row K _a and front row K _b is substantially perpendicular to the traveling direction 99 either. Back row K _a is located at the rear end lower portion of the traveling direction 99 of the platform 2, the two load cells 3a, 3c are disposed in the back row K _a. The front row K _b is located at the lower part of the front end in the traveling direction 99 of the mounting table 2, and two load cells 3 b and 3 d are arranged in the front row K _b .

The load cells 3a, 3b, 3c, 3d and the indicator 8 are connected so that the weighing signals from the load cells 3a, 3b, 3c, 3d are independently output to the indicator 8. Therefore, the indicator 8 can individually acquire the loads detected by the load cells 3a, 3b, 3c, and 3d. However, the load cell 3a belonging to the back row K _a, the load (or the sum of the load) detected by 3c, load cell 3b belonging to the front row K _b, and a detected load (or sum of the load) in 3d, indicator 8 The output configuration from each load cell 3a, 3b, 3c, 3d to the indicator 8 is not limited to the above if it can be used independently for calculation. In other words, a plurality of load cells 3 a, 3 b, 3 c, 3 d are arranged separately before and after the traveling direction 99 of the vehicle 4, and the load (in this case, the load cell 3 a, If the load detected at 3c) and the load detected at the rear (here, the load detected by the load cells 3b, 3d) can be used independently by the indicator 8, the scale 1 to the indicator 8 The output configuration may be different from that of the present embodiment.

  The load cells 3a, 3b, 3c, and 3d according to the present embodiment are all digital load cells. Each load cell 3a, 3b, 3c, 3d has an amplification unit, an A / D conversion unit, and a calculation unit incorporated in the load cell itself, and outputs the detected load to the indicator 8 as a digital weighing signal. Thus, by using a digital load cell as a load cell, it is possible to easily construct a configuration capable of independently transmitting the weighing signal of each load cell to the indicator 8. However, an analog load cell may be used instead of the digital load cell as the load cell included in the weighing scale 1. In this case, the analog output from the load cell is transmitted to the indicator 8 through the amplifier and the A / D converter.

  As shown in FIG. 3, the indicator 8 includes a CPU (Central Processing Unit) 81 that functions as an arithmetic device and a control device, a memory 82 that is a main storage device, and a hard disk 83 that is an auxiliary storage device. And a communication interface (communication I / F 86), which are connected by a bus 85. The communication I / F 86 is an interface used for communicating with an external device. As an example, the communication I / F 86 includes a display device for displaying and outputting the processing result of the indicator 8, information such as whether the driver of the vehicle 4 is allowed to enter or leave the platform 2 and warnings. An output means 87 such as a signal lamp or a speaker for transmission and an input means 88 such as a keyboard or a touch panel for inputting information and commands to the indicator 8 are connected.

  The CPU 81 functions as the measurement control unit 81a, the measurement unit 81b, the speed calculation unit 81c, and the vehicle speed monitoring unit 81d by executing the installed predetermined program. The measurement control unit 81 a controls the measurement operation of the vehicle measurement device 10. The weighing unit 81 b measures the load on the mounting table 2 based on the load detected by the load cells 3 a, 3 b, 3 c, 3 d and records it in the memory 82. The speed calculation unit 81c calculates the speed and acceleration of the vehicle 4 on the platform 2 based on the load measured by the weighing unit 81b. The vehicle speed monitoring unit 81d travels on the platform 2 of the vehicle 4 (specifically, overspeed, sudden start) based on the speed and acceleration of the vehicle 4 calculated by the speed calculation unit 81c. And sudden stop).

The hard disk 83 stores weight scale information 84 that is information about the weight scale 1. The weighing scale information 84, for example, a load cell 3a provided in the gravimeter 1, 3b, 3c, 3d characteristics and the size of the platform 2, the distance in the traveling direction 99 of the back row K _a and the front row K _b (hereinafter " Detection point distance L _p ”). Incidentally, if there are variations in the position of the traveling direction 99 of the load cell belonging to the back row K _a or front row K _b, the load cell 3a belonging to the back row K _a, the average position 3c to the position in the traveling direction 99 of the rear row K _a, load cell 3b belonging to the front row K _b, the average of the position of the 3d and the position of the traveling direction 99 of the back row K _a.

  Further, the hard disk 83 is provided with a vehicle information database (vehicle information DB 50) for storing vehicle information. FIG. 4 is a conceptual diagram showing an example of the layout of vehicle information stored in the vehicle information database. As shown in FIG. 4, vehicle information includes a vehicle number (vehicle number) field 51, an axle number field 52, an inter-axis distance field 53, a total amount field 54, a tare amount field 55, a net amount field 56, an operator field 57, Each field includes a product type field 58, a maximum load capacity field 59, and an overspeed field 60.

The vehicle number field 51 stores a vehicle number as identification information of the vehicle 4. The number of axles field 52 stores the number of axles of the vehicle, and the inter-axis distance field 53 stores the distance between axles L ₁ corresponding to the number of axles. The total amount field 54 stores the measurement result of the total weight W ₀ of the vehicle. The tare amount field 55 stores the tare amount of the vehicle. The net quantity field 56 stores the measurement result of the net quantity of the cargo obtained by subtracting the tare quantity from the total weight W _{0 of the} vehicle. In the present embodiment, the vehicle number, the number of axles, the distance between axles, the total weight of the vehicle, the tare amount of the vehicle, and the net amount of the load included in the vehicle information are positioned as vehicle attribute information. By referring to the vehicle attribute information, it is possible to know the attribute of the vehicle, and therefore it is possible to identify one vehicle from a plurality of vehicle groups, that is, to specify the vehicle.

  Further, the name of the company that manages the vehicle is displayed in the company field 57, the type (type) of the load loaded on the vehicle is displayed in the type field 58, and the vehicle is stored in the maximum load field 59. Each maximum loading capacity described in the verification is stored. In the overspeed field 60, the number of times or the like is stored as speed violation information when the vehicle speed monitoring unit 81c detects a driving speed violation (specifically, overspeed, sudden start or sudden stop) for the vehicle. Is done. The vehicle number, the number of axles, the tare amount of the vehicle, the name of the operator, the type of load, and the maximum load amount are registered in advance in the vehicle information DB 50, while the total weight of the vehicle and the net amount of the load are measured. The result and the speed violation information are registered in the vehicle information DB 50 at the end of the weighing operation described later.

(Operation example of the vehicle measuring device 10)
Next, an outline of the weighing operation performed by the vehicle measuring device 10 will be described with reference to FIG. FIG. 6 is a flowchart showing a schematic flow of the operation of the vehicle measuring device. Control and calculation related to the weighing operation performed by the vehicle measuring device 10 are performed by the weighing control unit 81 a of the indicator 8.

The driver of the vehicle 4 to be weighed causes the vehicle 4 to enter the platform 2 and stops the vehicle 4 on the platform 2 with all the axles of the vehicle 4 getting on the platform 2. The weighing with the weighing scale 1 is started before the vehicle 4 enters the platform 2 (step S1) and is continued thereafter. That is, the measuring section 81b of the indicator 8, the load cells 3a, 3b, 3c, the load detected by the 3d acquired, load cell 3a arranged in the rear row K _a, the sum of the weight detected by 3c (hereinafter " The rear weight W _a ”), the sum of the weights detected by the load cells 3 b and 3 d arranged in the front row K _b (hereinafter referred to as“ front weight W _b ”), and the sum of the weights detected by all the load cells ( Hereinafter, “detected total amount W”) is calculated, and these are sequentially recorded in the memory 82. The history is generated by sequentially calculating and accumulating the rear weight W _a , the front weight W _b and the detected total amount W.

First, the indicator 8 detects that the vehicle 4 has stopped on the platform 2 (step S2). While the vehicle 4 is moving on the stage 2, the rear weight W _a and the front weight W _b vary. Therefore, the indicator 8 can indirectly detect that the vehicle 4 has stopped on the platform 2 because the fluctuations in the rear weight W _a and the front weight W _b have been subsided. When the stop of the vehicle 4 is detected in this way, the fluctuation of the detection value of the weighing scale 1 is settled and stable.

After it is detected that the vehicle 4 has stopped on the platform 2, the indicator 8 identifies the vehicle 4 to be weighed (step S3). Here, the operator inputs the identification information of the vehicle 4 to be weighed into the indicator 8 via the input means 88 connected to the indicator 8. The identification information is, for example, the vehicle number of the vehicle 4. The indicator 8 that has acquired the identification information of the vehicle 4 refers to the vehicle information DB 50 to identify the corresponding vehicle information, and generates measurement target information from this vehicle information (step S4). The metering target information, the identification number (vehicle number) of the vehicle 4, the number of axles, axle distance L _1, tare weight includes information for processing by the indicator 8, such as maximum load capacity, memory 82 is temporarily stored.

Subsequently, the indicator 8 measures the total weight W ₀ of the vehicle 4 and the net amount of the load (step S5). The total weight W ₀ of the vehicle 4 is a detected total amount W detected when the vehicle stops on the mounting table 2. The net amount of the load is a value obtained by subtracting the tare amount of the vehicle 4 included in the measurement target information from the total weight W _{0 of the} vehicle 4.

Indicator 8, the total weight W ₀ after or metering simultaneously performs rate calculation processing by the speed calculator 81c (step S6), and vehicle 4 on the loading table 2 from the start of entry to the platform 2 The speed v and acceleration a until stopping are calculated. Further, the indicator 8 performs a speed monitoring process (step S7), and performs a speed monitoring operation of the vehicle 4 using the calculated speed v and acceleration a to generate speed violation data. The speed calculation process and the speed monitoring process will be described in detail later.

After completion speed monitoring process (step S7), and indicator 8 generates at least including weighing result net amount of the total weight W ₀ and cargo of the vehicle 4, and speeding data, the weighing result data from the weighing object information (Step S8), the generated measurement result data is output to the output means 87 such as a display device connected to the indicator 8 (Step S9). For example, when the weighing result data is output to the display device, at least the total weight W ₀ , the net amount of the load, and the speed violation data are displayed on the display device. The information that can be included in the speed violation data includes the overspeed, sudden start, or sudden stop speed violation, and good, and the speed speed violation is output to the output means 87 in this manner, thereby speeding the driver. Compliance is encouraged. As an example of output of speed violation data, it is output as an image notifying the display device that the speed or acceleration is violated to the operator, output as a flashing signal light to the driver, or directed to the driver May be output as a warning sound from the speaker.

  Subsequently, the indicator 8 outputs an exit permission signal (step S10). The exit permission signal is output to the output means 87 connected to the indicator 8. Based on the exit permission signal, the operator guides the driver of the vehicle 4, or the driver determines permission to leave, and the driver causes the vehicle 4 to leave the platform 2.

  The indicator 8 detects that the vehicle 4 has left the platform 2 (step S11), and ends the weighing of the vehicle 4 of the weighing scale 1 (step S12). Whether the vehicle 4 has left the platform 2 can be determined from the load detected by the weight scale 1. When the vehicle 4 leaves the platform 2, the indicator 8 performs a speed calculation process (step S 13), and calculates the speed v and acceleration a from when the vehicle 4 stops on the platform 2 to when the vehicle 4 leaves the platform 2. calculate. Further, the indicator 8 performs a speed monitoring process (step S14), and performs a speed monitoring operation of the vehicle 4 using the calculated speed v and acceleration a to generate speed violation data. The speed calculation process and the speed monitoring process will be described in detail later.

  Finally, the indicator 8 adds the newly generated speed violation data to the weighing result data (step S15), and records this weighing result data in the vehicle information stored in the vehicle information DB 50 (step S16). Similarly to step S11, the data is output to the output means 87 such as a display device or a printer connected to the indicator 8 (step S17).

  As mentioned above, although the flow of the suitable measurement operation | movement of the vehicle measuring device 10 which concerns on this embodiment was demonstrated, said each process may be abbreviate | omitted as needed, a sequence may be changed, or it may perform simultaneously. Is possible. Next, speed calculation processing and speed monitoring processing included in the weighing operation of the vehicle measurement device 10 will be described.

(Speed calculation process)
First, the speed calculation process (step S8, step S15) performed by the speed calculation unit 81c will be described in detail. In order to calculate the speed v and acceleration a of the vehicle 4, the speed calculation unit 81 c of the indicator 8 records the history of the rear weight W _a , the history of the front weight W _b , the history of the total amount W, the measurement target information, and the weigh scale Information 84 is used. In particular, the number of axles and the inter-axle distance L ₁ in the measurement target information are used, and the distance between detection points L _p in the weighing scale information 84 is used. Then, the speed calculation unit 81c calculates the position of the reference point of the vehicle 4 (hereinafter referred to as “reference position x”) using these, and the speed v of the vehicle 4 and the amount of displacement of the reference position x per unit time are calculated. The acceleration a is calculated. Here, the back row K _a as the origin, first axle 4f of the vehicle 4 traveling direction 99 of the front and rear center of the (preceding axle) (the center of gravity) as a reference position x, in the traveling direction 99 from the back row K _a to the reference position x The distance will be described as a displacement amount of the reference position x.

FIG. 5 is a graph showing an example of a time-series change in the total amount detected by the vehicle measurement device. In the graph shown in FIG. 5, the vertical axis represents the detected total amount W. The total detected amount W is the sum of the rear weight W _a and the front weight W _b . In the graph shown in FIG. 5, the horizontal axis represents the elapsed time from the start of weighing with the weighing scale 1. First axle 4f enters into the platform 2 at time t _1, second axle 4b enters into the platform 2 to the time t _2, the vehicle 4 is stopped at time t _3, the vehicle 4 is starting at time t ₄ and, first axle 4f is withdrawn from the mounting base 2 at time t _5, the second axle 4b retreats from the mounting base 2 at time t _6. As shown in this graph, the total detected amount W changes stepwise as the vehicle 4 moves on the platform 2. This corresponds to the situation of the axles on the platform 2 (that is, which axle is on the platform 2). Hereinafter, for the convenience of explanation, the period from time t ₁ to time t ₂ when only the first axle 4 f is on the mounting platform 2 is referred to as “first stage S ₁ ”, and the first axle 4 f is mounted on the mounting platform 2. From time t ₂ to time t ₅ when the second axle 4b is present is referred to as “second stage S ₂ ”, and from time t ₅ to time t ₆ when only the second axle 4b is on the mounting base 2 is designated as “third stage S ₂ ”. It will be referred to as “stage S ₃ ”. In the first stage S ₁ , the detected total amount W represents the shaft weight (first shaft weight W ₁ ) of the first axle 4 f. In the second stage S ₂ , the detected total amount W represents the total weight W ₀ of the vehicle 4. In the third stage S ₃ , the detected total amount W represents the shaft weight (second shaft weight W ₂ ) of the second axle 4 b.

The speed calculation unit 81c selects an optimal calculation formula according to the number of axles of the vehicle 4 and the situation of the axles of the vehicle 4 on the platform 2, and uses the selected calculation formula to determine the reference position x. calculate. Specifically, the speed calculation unit 81c acquires the number of axles of the vehicle 4 from the measurement target information, and subsequently, the state of the axles on the platform 2 (that is, based on the history of the number of axles and the detected total amount W) (that is, Stage S ₁ , S ₂ , S ₃ ). Since the detected total amount W detected at the boundary of each stage S ₁ , S ₂ , S ₃ fluctuates greatly, the state of the axles on the platform 2 is determined based on the number of axles and the amount of change in the detected total amount W. Can be identified. When the number of axles is 2, a sudden change in the detected total amount W is caused when the first axle 4f of the vehicle 4 enters the platform 2 (time t ₁ ), and the second axle 4b of the vehicle 4 enters the platform 2. Time (time t ₂ ), when the first axle 4 f of the vehicle 4 leaves the platform 2 (time t ₅ ), and when the second axle 4 b of the vehicle 4 leaves the platform 2 (time t ₆ ). Appears 4 times. For example, when there are two sudden changes in the detected total amount W, it is the second stage S ₂ (that is, the situation where the first axle 4f and the second axle 4b are on the platform 2). Then, the speed calculation unit 81c calculates the reference position x using a calculation formula corresponding to the state of the axle on the mounting table 2. In the present embodiment, when the speed calculation unit 81c calculates the position of the reference position x, using the first stage S ₁ in formula F ₁ from time t ₁ to time t _2, from time t ₂ to time t ₅ The second stage S ₂ uses the calculation formula F _2, and the third stage S ₃ from time t ₅ to time t ₆ uses the calculation formula F ₃ . Hereinafter, calculation formula F ₁ , calculation formula F ₂ and calculation formula F ₃ will be described in order.

(Calculation formula F ₁ )
The calculation formula F ₁ is a formula for calculating the reference position x when a vehicle having two axles is in the first stage S ₁ . FIG. 7 is a diagram for explaining a method for calculating a reference position when the first axle of a vehicle having two axles is on the platform. As shown in FIG. 7, if the distance in the traveling direction 99 from the rear row K _a to the front row K _b is a distance L _p between the detection points, the reference position x, the rear weight W _a , the front weight W _b, and the distance between the detection points The relationship of the following formula 1 is established between L _p . Then, the reference position x can be obtained from the relationship of Formula ₁ using the calculation formula F ₁ shown in Formula 2.

(Calculation formula F ₂ )
Formula F ₂ is an equation for calculating a reference position x when the vehicle axle number 2 is in the second stage S _2. FIG. 8 is a diagram for explaining a method for calculating the reference position when all the axles of a vehicle having two axles are on the platform. As shown in FIG. 8, the distance in the traveling direction 99 from the back row K _a to the center of gravity G of the vehicle 4 and y, the distance in the traveling direction 99 from the center of gravity G of the vehicle 4 to the center of the first axle 4f was z Sometimes, between the first shaft weight W ₁ , the second shaft weight W ₂ , the detection point distance L _p , the rear side weight W _a , the front side weight W _b , the axle distance L ₁ , the distance y and the distance z, The following equation 3 is established. Since the reference position x is the sum of the distance y and the distance z, the reference position x can be obtained using the calculation formula F ₂ shown in Formula 4. The detected total amount W of the second stage S ₂ is the total weight W ₀ of the vehicle, and the total weight W ₀ is the sum of the first shaft weight W ₁ and the second shaft weight W ₂ . Therefore, the value obtained by subtracting the detected total amount W (= W ₁ ) of the first stage S ₁ from the detected total amount W (= W ₀ ) of the second stage S ₂ is the second shaft weight W ₂ .

(Calculation formula F ₃ )
Formula F ₃ is an equation for calculating a reference position x when the vehicle axle number 2 is in the third stage S _3. FIG. 9 is a diagram for explaining a method for calculating the reference position when the second axle of a vehicle having two axles is on the platform. As shown in FIG. 9, when the distance in the traveling direction 99 from the back row K _a to the center of the second axle 4b and u, the distance between the detection point L _p, rear weight W _a, the front weight W _b and the distance u In the meantime, the relationship of Formula 5 is established. Since the reference position x is the sum of the distance u and the inter-axle distance L ₁ , the reference position x can be obtained using the calculation formula F ₃ shown in Expression 6.

The inter-axle distance value L ₁ stored in the inter-axis distance field 53 of the vehicle information DB 50 can be used as the inter-axle distance L ₁ between the first axle 4f and the second axle 4b of the vehicle 4. It can also be calculated based on the load detected by the scale 1 as shown in FIG. FIG. 10 is a graph showing an example of the relationship between the rear side weight and the travel distance of the vehicle. In the graph shown in FIG. 10, the vertical axis first, shows a second load cell 3a belonging to the back row K _a in the third stages of the side weight W _a after the sum of the load detected by 3c, The horizontal axis represents the distance in the traveling direction 99 from the rear row to the first axle 4f of the vehicle 4, that is, the reference position x. The rear side weight W _a when the reference position x is zero represents the first shaft weight W ₁ that is the shaft weight of the first axle 4f. When the rear weight W _a immediately before the second axle 4b of the vehicle 4 is placed on the platform 2 is W _a1 and the distance between the rear row and the front row in the traveling direction 99 is the detection point distance L _p , 7 is established, from which the inter-axle distance L ₁ can be calculated based on Equation 8. As the number of axes, the number of axles stored in the number-of-axes field 52 of the vehicle information DB 50 can be used, but the number of axles can also be calculated based on the change in the load waveform shown in FIG. .

As described above, the reference position x of the vehicle 4 can be calculated using the rear weight W _a and the front weight W _b that can be used independently. Further, the velocity v can be calculated by differentiating the reference position x with respect to time, and the acceleration a can be calculated by differentiating the velocity v with respect to time. Thus, the vehicle measuring device 10 does not include a special speed sensor or the like, and uses the configuration for measuring the weight of the vehicle (that is, the weighing scale 1), and the speed of the vehicle traveling on the platform 2 v and acceleration a can be measured. Further, the vehicle measurement device 10 can calculate the reference position x of the vehicle 4 regardless of the number of axles of the vehicle 4 on the mounting table 2. Therefore, when there is only one axle of the vehicle 4 on the platform 2 (when the vehicle 4 enters or leaves the platform 2), or all axles of the vehicle 4 on the platform 2 It is possible to measure the speed v and acceleration a of the vehicle 4 during the entire process of getting on and off the vehicle 2 such as when there is a vehicle (when the vehicle 4 stops and starts on the vehicle 2).

(Vehicle speed monitoring process)
Next, the vehicle speed monitoring process (step S9, step S16) performed by the vehicle speed monitoring unit 81d will be described. In the vehicle speed monitoring process, the vehicle speed monitoring unit 81d uses the speed v and the acceleration a calculated by the speed calculation unit 81c to violate the traveling speed when entering and leaving the platform 2 of the vehicle 4 (specifically, Detects overspeed, sudden start, and sudden stop. The vehicle speed monitoring unit 81d compares the speed v with a preset regulated speed (upper limit value of speed), and compares the acceleration a with a preset regulated acceleration (upper limit value and lower limit value of acceleration). If the speed v exceeds the regulated speed, an excess speed is detected. Further, when the acceleration a exceeds the upper limit value of the regulated acceleration, a sudden start is detected, and when the acceleration a falls below the lower limit value, a sudden stop is detected.

  When the vehicle speed monitoring unit 81d detects at least one of speed violations of overspeed, sudden start, and sudden stop, the vehicle speed monitoring unit 81d generates speed violation data including the speed v, the acceleration a, and the content of the speed violation. The speed violation data is output in such a manner that a warning is issued to at least one of the operator and the driver via the output means 87 connected to the indicator 8 as described above.

  Furthermore, the vehicle speed monitoring unit 81d adds speed violation information to the overspeed field 60 of the vehicle information of the corresponding vehicle 4 in the vehicle information DB 50. The speed violation information added to the speed excess field 60 includes at least one of the number of times the speed violation is detected, the content of the speed violation, the speed and acceleration at the time of the speed violation, the detection date and time of the speed violation, and the like. The speed violation information stored in the overspeed field 60 of the vehicle information is used to warn the driver of the vehicle 4 and the business operator about the violation of the traveling speed. For example, when a vehicle in which speed violation information is accumulated more than a predetermined number of times in the vehicle information overspeed field 60 uses the vehicle measuring device 10, the indicator 8 issues a warning through the output means 87, and the driver is notified. Alerts can be made not to recur driving speed violations. Further, for example, when speed violation information is accumulated a predetermined number of times in the overspeed field 60 of the vehicle information of a vehicle, a warning letter can be sent to the driver of the vehicle or the business operator to which the vehicle belongs.

  As mentioned above, although one suitable embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment, and is described in the claims as illustrated in the following modifications 1 to 5. As long as this is done, various design changes can be made.

[Modification 1]
In the speed calculation unit 81c according to the above embodiment, both the speed v and the acceleration a of the vehicle 4 are calculated, but only the speed v may be calculated. When only the speed v is calculated by the speed calculation unit 81c, the vehicle speed monitoring unit 81d is configured to detect an overspeed from the speed v. At this time, the vehicle speed monitoring unit 81d calculates a difference Δv between successive speeds v (that is, a difference between the speed calculated last time and the speed calculated this time), and detects a sudden start and a sudden stop from the difference Δv. It may be configured to.

[Modification 2]
Further, in the weighing operation of the vehicle measurement device 10 according to the above-described embodiment, the speed calculation process and the vehicle speed are respectively performed after the vehicle 4 stops on the platform 2 and after the vehicle 4 leaves the platform 2. Although the monitoring process is performed, the timing of these processes is not limited to the above. For example, the speed calculation process and the vehicle speed monitoring process may be performed only after the vehicle 4 has left the platform 2.

[Modification 3]
Further, in the weighing operation of the vehicle measuring device 10 according to the above embodiment, the vehicle 4 is temporarily stopped on the platform 2 and the total weight W ₀ is measured, but the vehicle 4 runs through without being stopped on the platform 2. the total weight W ₀ may be metered into the house. In this case, the speed calculation process and the vehicle speed monitoring process can be performed at a timing after the vehicle 4 leaves the platform 2 and the weighing is finished. Further, the speed calculation process and the vehicle speed monitoring process may be performed while the vehicle 4 is traveling on the platform 2.

[Modification 4]
In the speed calculation process performed by the speed calculation unit 81c, the reference point of the vehicle 4 is the center of gravity of the axle that is the foremost in the traveling direction 99 (the center of gravity of the first axle 4f), but the reference point of the vehicle 4 is limited to this. Instead, the center of gravity of another axle such as the center of gravity of the rearmost axle 99 (the center of gravity of the second axle 4b) or a part other than the center of gravity of the axle can be used as a reference point. For example, when the center of gravity of the rearmost axle 99 (the center of gravity of the second axle 4b) is used as a reference point, the speed calculation unit 81c calculates the position of the reference position x (the center of gravity of the second axle 4b). Referring to FIG. 1, using the first stage S ₁ in formula F _4, using a formula F ₅ in the second stage S _2, the third stage S ₃ in formula F ₆ is used. In formula F ₄ shown in Equation 9, seeking the reference position x from the reference position x obtained by the equation F ₁ Pull axle distance L _1. In formula F ₅ shown in Equation 10, seeking the reference position x from the reference position x obtained by the equation F ₂ by subtracting the inter-axle distance L _1. In formula F ₆ shown in Equation 11, by subtracting the inter-axle distance L ₁ from the reference position x obtained by the calculation formula F _3, seeking the reference position x.

[Modification 5]
Moreover, in the said embodiment, although the vehicle 4 which is a measurement object assumes the vehicle of front and rear 2 axis | shaft, the vehicle 4 which is a measurement object may be a vehicle of 3 or more front and rear axes. For example, when the vehicle 4 has three axles, the speed calculation unit 81c calculates the reference position x using a calculation formula associated with a vehicle having three axles. Specifically, the speed calculation unit 81c calculates Formulas F ₁ , F ₂ , F ₃ , F ₃ and F that are applied to a vehicle having three axles according to the state of the axles on the platform 2. ₇ and any one among the calculation formula F ₈ selectively using to calculate the reference position x.

Only the first axle of the axle number 3 of the vehicle 4 when located on the platform 2, to calculate the reference position x (the center of gravity of the first shaft) using the equation F _1. When the first axle and the second axle of the vehicle 4 having the number of axles 3 are on the mount ₂ , the reference position x is calculated using the calculation formula F ₂ . When only the third axle of the axle number 3 of the vehicle 4 is on the platform 2 calculates a reference position x using equation F _3.

When all axles of the axle number 3 of the vehicle 4 is on the platform 2 calculates the reference position x (the center of gravity of the first shaft) using the equation F _7. FIG. 11 is a diagram for explaining a method for calculating a reference position when all the axles of a vehicle having three axles are on the platform. As shown in FIG. 11, the vehicle 4 having three axles has a first axle on the front side in the traveling direction 99 from the center of gravity G, and has a second axle and a third axle on the rear side in the traveling direction 99 from the center of gravity G. Yes. Here, the inter-axle distance from the first axle to the second axle L _1, the inter-axle distance from the second axle to the third axle L _2, in the traveling direction 99 from the back row K _a to the center of gravity G of the vehicle 4 The distance is y, the distance in the traveling direction 99 from the center of gravity G of the vehicle 4 to the center of the first axle is z, the axle weight of the first axle is the first axle weight W ₁ , and the axle weight of the second axle is the second axle weight. Let W _{2 be} the third axle weight W ₃ and the axle weight of the third axle. Rear weight W _a , front weight W _b , first shaft weight W ₁ , second shaft weight W ₂ , third shaft weight W ₃ , distance between axles L ₁ , distance between axles L ₂ , distance between detection points L _p , And the distances y and z, the relationship is established in Formula 12. Since the reference position x is the sum of the distances y and z, the reference position x can be obtained by using the calculation formula F ₇ shown in Expression 13.

When the second axle and the third axle of the vehicle 4 having the number of axles 3 are on the mount 2, the reference position x (the center of gravity of the first axis) is calculated using the calculation formula F ₈ . FIG. 12 is a diagram for explaining a method for calculating the reference position when the second axle and the third axle of a vehicle having three axles are on the mounting base. As shown in FIG. 12, the center of gravity of the second axle and the third axle and G _23, the traveling direction 99 of the distance in the traveling direction 99 from the back row K _a to the center of gravity G ₂₃ y, from the center of gravity G ₂₃ to the second axle Let z be the distance. Here, the rear weight W _a , the front weight W _b , the first shaft weight W ₁ , the second shaft weight W ₂ , the third shaft weight W ₃ , the axle distances L ₁ and L ₂ , and the detection point distance L _p. , And the distances y and z, the relationship is established in Equation 14. Since the reference position x is the sum of the distances y and z and the inter-axle distance L ₁ , the reference position x can be obtained using the calculation formula F ₈ shown in Formula 15.

As described above, the calculation formula of the reference position x corresponding to the number of axles that can be assumed is stored in the indicator 8 in advance, and the speed calculation unit 81c determines the number of axles of the vehicle 4 and the number of axles on the platform 2. Based on the situation, the reference position x is calculated by selectively using an optimal calculation formula from among a plurality of calculation formulas stored in the indicator 8 in advance. In this manner, the speed calculation unit 81c can calculate the reference position x of the vehicle 4 regardless of the number of axles, and can calculate the speed v and the acceleration a from the calculated reference position x. . Further, since the speed calculation unit 81c uses the rear weight W _a and the front weight W _b that are sequentially recorded during the weighing operation, even if the speed v of the vehicle 4 fluctuates as it travels on the platform 2. The speed v and acceleration a of the vehicle 4 that fluctuate can be calculated.

  Since the present invention calculates the speed of the vehicle based on a change in the load on the platform, the present invention can be widely applied to a vehicle measuring apparatus having a platform for weighing the vehicle regardless of its detailed structure. Can do.

1 Weight Scale 2 Platform 3 Subordinate 4 Vehicle 4f First Axle 4b Second Axle 41, 42, 43, 44 Wheel 8 Indicator 81 CPU
81a Weighing control unit 81b Weighing unit 81c Speed calculation unit 81d Vehicle speed monitoring unit 82 Memory 83 Hard disk 87 Output unit 88 Input unit 10 Vehicle measuring device 50 Vehicle information DB

Claims (7)

A platform having a size capable of placing all the wheels of the vehicle to be measured, a plurality of load detectors arranged to support the platform, and detecting a load applied to the platform; An indicator that performs calculation using the detection output from the load detector,
The indicator stores a plurality of calculation formulas according to the number of axles of the vehicle and the situation of the axles on the table described above,
The indicator includes a weighing unit that calculates the weight of the vehicle based on loads detected by the plurality of load detectors, a sum of the number of axles of the vehicle and the loads detected by the plurality of load detectors. Based on the history of a certain detected total amount, the situation of the axle of the vehicle on the above-mentioned table is specified, and the number of axles of the vehicle and the state of the axle of the vehicle on the above-mentioned table are determined from the plurality of calculation formulas. And a speed calculation unit that calculates one or both of the speed and acceleration of the vehicle using one selected according to the vehicle. The plurality of calculation formulas calculate positions of certain reference points attached to the vehicle based on loads detected by the plurality of load detectors ,
The speed calculation unit, said plurality of equations using one of the selected calculates the position of the reference point of the vehicle, obtains the displacement amount of the reference point, the vehicle on the basis of the displacement amount The vehicle measurement device according to claim 1, wherein one or both of the speed and acceleration is calculated.   The vehicle measurement device according to claim 2, wherein the reference point is a center of a front axle or a rearmost axle of the vehicle. The plurality of load detectors are one or more rear load detectors arranged on the rear side from the front and rear center in the traveling direction of the vehicle in the front table, and front from the front and rear center in the front direction in the front table. One or more front load detectors arranged in
The weighing unit and the speed calculation unit are independent of the sum of the loads detected by the one or more rear load detectors and the sum of the loads detected by the one or more front load detectors, respectively. The vehicle measurement device according to any one of claims 1 to 3, wherein the plurality of load detectors and the indicator are connected so that they can be used.   The vehicle measurement device according to any one of claims 1 to 4, wherein each of the plurality of load detectors is a digital load cell. The speed calculation unit is a load applied to the rear side from the front-rear center in the traveling direction of the vehicle of the table described above, a load applied to the front side from the front-rear center of the travel direction of the table described above, and a distance between the axles of the vehicle, or In addition to these, the distance between the load detector disposed behind the front-rear center of the table in the traveling direction and the load detector disposed frontward of the front-rear center of the table in the traveling direction. is used to calculate the either or both of the speed and acceleration of the vehicle, vehicle measuring apparatus according to any one of claims 1-5. The indicator is on the table described above of the vehicle by comparing one or both of the vehicle speed and acceleration calculated by the speed calculation unit with a predetermined restriction speed or a predetermined restriction acceleration. The vehicle measurement device according to any one of claims 1 to 6 , further comprising a vehicle speed monitoring unit that detects an excess speed, sudden start, and sudden stop of the vehicle.

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