JP2020020729A - Weight measurement system and vehicle separation method - Google Patents

Abstract

To provide a weight measurement system and a vehicle separation method that can measure the weight per vehicle with a simple configuration.SOLUTION: A weight measurement system 100 comprises: a detection signal acquisition unit 111 that acquires detection signals for each wheel output from a plurality of wheel load sensors arranged in the direction of travel A of a vehicle 200; a wheel load calculation unit 112 that calculates the speed of travel and wheel load of the wheels on the basis of the acquired detection signals; a separation determination unit 114 that determines, for each of the wheel load sensors, whether the wheel load corresponding to the wheel load sensor is the wheel load for the same vehicle 200, on the basis of the speed of travel and the wheel load of a preceding wheel and the speed of travel and the wheel load of a subsequent wheel, which are acquired; a vehicle separation unit 115 that separates the wheel load for every vehicle on the basis of a result of determination made by the separation determination unit 114; and a weight measurement unit 116 that measures the weight of the vehicle on the basis of the separated wheel load for every vehicle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a weight measurement system for measuring the weight of a vehicle traveling on a vehicle road, and a vehicle separation method for separating the vehicles one by one in the weight measurement system.

  2. Description of the Related Art Conventionally, a process of measuring the weight of a vehicle traveling on a vehicle road and determining whether the measured weight exceeds a standard defined by laws and regulations is performed. In order to accurately measure the weight of one vehicle, a process (hereinafter, referred to as “vehicle separation”) for dividing a running vehicle into individual vehicles is required.

  Patent Literature 1 discloses a vehicle measurement device that includes a vehicle separator that separates a vehicle and a measurement unit that detects a wheel load by mounting a wheel, and that measures the weight of one vehicle. The vehicle separator includes a pair of optical sensors installed on both sides of a vehicle road. One optical sensor transmits an optical signal, and the other optical sensor receives the optical signal. The vehicle separator separates the vehicles one by one based on a receiving state and a blocking state of the optical signal in the optical sensor.

JP 2012-18149 A

  However, the vehicle measurement device described in Patent Document 1 requires a device (vehicle separator) for performing vehicle separation, separately from the measurement unit. Therefore, there is a problem that the configuration of the entire system for measuring the weight of the vehicle is complicated.

  An object of the present invention is to provide a weight measurement system and a vehicle separation method capable of measuring the weight of each vehicle with a simple configuration.

  The weight measurement system according to one aspect of the present invention includes a detection signal acquisition unit that acquires a detection signal for each wheel output from a plurality of wheel load sensors arranged at predetermined intervals in a traveling direction of the vehicle; Based on the detection signal acquired by the signal acquisition unit, a calculation unit that calculates the traveling speed and wheel weight of the wheel, and the traveling speed and the wheel weight of the preceding wheel calculated earlier by the calculation unit The vehicle in which the wheel weight corresponding to the wheel load sensor is the same for each of the wheel load sensors based on the traveling speed and the wheel load of the following wheel calculated by following the calculation unit in the backward direction. A separation determining unit that determines whether the vehicle weight is equal to or not, and the wheel weight calculated by the calculation unit based on a determination result of the separation determining unit for each of the plurality of wheel load sensors. Vehicle separation unit that separates each unit , Based on the wheel load of each one the separated vehicle by the vehicle separation unit, and a weight measuring unit for measuring the weight of the vehicle.

  According to this configuration, the wheel load is separated for each vehicle based on the detection signal of the wheel load sensor, and the weight of the vehicle is calculated. That is, according to the weight measuring system, the vehicle can be separated by the axle load sensor for detecting the wheel weight without requiring a separate device for separating the vehicle. Can be measured.

  In the weight measurement system according to another aspect of the present invention, the separation determination unit includes the wheel weight of the preceding wheel corresponding to the wheel weight sensor and the wheel weight of the following wheel corresponding to the wheel weight sensor. If the absolute value of the difference is equal to or greater than a first threshold, it is determined that the wheel load of the preceding wheel and the wheel load of the following wheel are not the same wheel load of the vehicle, and the wheel load sensor The first flag may be set.

  According to this configuration, when the difference between the wheel weight of the preceding wheel and the wheel weight of the following wheel is equal to or greater than the first threshold, the wheel weight is separated for each vehicle. Therefore, the vehicle can be separated based on the magnitude of the wheel load.

  In the weight measuring system according to another aspect of the present invention, the separation determination unit includes the traveling speed of the preceding wheel corresponding to the wheel load sensor and the traveling speed of the following wheel corresponding to the wheel load sensor. If the absolute value of the difference is equal to or greater than a second threshold, it is determined that the wheel load of the preceding wheel and the wheel load of the following wheel are not the same wheel load of the same vehicle, and the wheel load sensor The first flag may be set.

  According to this configuration, the wheel load is separated for each vehicle when the difference between the traveling speed of the preceding wheel and the traveling speed of the following wheel is equal to or greater than the second threshold. Therefore, the vehicle can be separated based on the magnitude of the traveling speed of the wheel.

  In the weight measurement system according to another aspect of the present invention, the separation determination unit may perform a predetermined time period from when the preceding wheel passes through the wheel load sensor to when the following wheel passes through the wheel load sensor. In the case described above, it is determined that the wheel load of the preceding wheel and the wheel load of the following wheel are not the same as the wheel load of the same vehicle, and the first flag is set to the wheel load sensor. Is also good.

  According to this configuration, the time from when the preceding wheel passes through the wheel load sensor to when the following wheel passes through the wheel load sensor, that is, the non-reaction time during which the wheel load sensor does not respond is equal to or longer than a predetermined time. In this case, the wheel load is separated for each vehicle. Therefore, the vehicle can be separated based on the reaction state of the wheel load sensor.

  In a weight measurement system according to another aspect of the present invention, the vehicle separation unit may include, when a total number of the wheel load sensors with the first flag set among the plurality of wheel load sensors is equal to or greater than a third threshold value, The wheel weight calculated by the calculation unit may be separated for each vehicle.

  According to this configuration, the wheel load is separated for each vehicle when the total number of wheel load sensors for which the first flag is set is equal to or greater than the third threshold. Therefore, for example, even when one wheel load sensor fails, it is possible to appropriately measure the weight.

  In the weight measurement system according to another aspect of the present invention, the third threshold value may be set to a value that is a half or a majority of the total number of the wheel load sensors.

  In the weight measurement system according to another aspect of the present invention, the calculation unit may determine a distance between a first wheel load sensor and a second wheel load sensor adjacent downstream from the first wheel load sensor. By dividing by the time from the passing time at which the wheel passed through the first wheel load sensor to the passing time at which the preceding wheel passed through the second wheel load sensor, the weight of the wheel corresponding to the second wheel load sensor was calculated. The traveling speed is calculated, and the calculating unit further multiplies the total value of the signal levels of the detection signals output from the second wheel load sensor by the traveling speed of the wheel, thereby calculating the second wheel. It may be configured to calculate the wheel weight of the wheel corresponding to the weight sensor.

  A vehicle separation method according to another aspect of the present invention includes a detection signal obtaining step of obtaining a detection signal for each wheel output from a plurality of wheel load sensors arranged at predetermined intervals in a traveling direction of the vehicle; Based on the detection signal obtained in the signal obtaining step, a calculating step of calculating the traveling speed and wheel weight of the wheel, and the traveling speed and the wheel weight of the preceding wheel calculated in advance in the calculating step The vehicle in which the wheel weight corresponding to the wheel load sensor is the same for each of the wheel load sensors based on the traveling speed and the wheel load of the following wheel calculated by following in the calculation step. The wheel load calculated in the calculation step based on the determination result of the separation determination step for each of the plurality of wheel load sensors. Including a vehicle separation step of separating each one, on the basis of the said wheel load of the vehicle separated by the separating step was the vehicle for each one, and weight measurement step of measuring the weight of the vehicle, a.

  According to the present invention, it is possible to measure the weight of each vehicle with a simple configuration.

FIG. 1 is a diagram showing a schematic configuration of a weight measuring system according to an embodiment of the present invention. FIG. 2A is a diagram illustrating a running state of a vehicle in the weight measurement system according to the embodiment of the present invention. FIG. 2B is a diagram showing vehicle information corresponding to the state of FIG. 2A. FIG. 3A is a diagram illustrating a running state of a vehicle in the weight measurement system according to the embodiment of the present invention. FIG. 3B is a diagram showing vehicle information corresponding to the first wheel in the state of FIG. 3A. FIG. 3C is a diagram showing vehicle information corresponding to the second wheel in the state of FIG. 3A. FIG. 4A is a diagram illustrating a running state of a vehicle in the weight measurement system according to the embodiment of the present invention. FIG. 4B is a diagram illustrating vehicle information corresponding to the second wheel in the state of FIG. 4A. FIG. 5 is a diagram illustrating vehicle information corresponding to the second wheel in the weight measurement system according to the embodiment of the present invention. FIG. 6 is a diagram showing vehicle information corresponding to the wheel load sensor in the weight measurement system according to the embodiment of the present invention. FIG. 7 is a diagram illustrating a result of the separation determination for each wheel load sensor in the weight measurement system according to the embodiment of the present invention. FIG. 8 is a diagram illustrating a running state of the vehicle in the weight measurement system according to the embodiment of the present invention. FIG. 9 is a flowchart illustrating an example of the separation determination process performed by the weight measurement system according to the embodiment of the present invention. FIG. 10 is a flowchart illustrating an example of a timeout process performed by the weight measurement system according to the embodiment of the present invention. FIG. 11 is a flowchart illustrating an example of the weight measurement process performed by the weight measurement system according to the embodiment of the present invention. FIG. 12 is a diagram showing another configuration of the weight measuring system according to the embodiment of the present invention. FIG. 13 is a diagram showing another configuration of the weight measuring system according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. It should be noted that the embodiments described below are merely examples embodying the present invention, and do not limit the technical scope of the present invention.

  The weight measuring system according to the present invention includes a vehicle separating function for separating vehicles traveling on a vehicle road one by one, and a weight measuring function for measuring the weight of each vehicle. Hereinafter, an example of a specific embodiment of the present invention will be described.

  As shown in FIG. 1, the weight measuring system 100 according to the embodiment of the present invention includes axle load sensors W1, W2, and W3 embedded in a vehicle road 10. The axle load sensors W1, W2, and W3 are arranged in this order at predetermined intervals in the traveling direction A of the vehicle 200 traveling on the vehicle road 10. Further, the axle load sensors W1, W2, W3 may be unequally arranged so that the intervals between adjacent axle load sensors are different. Specifically, the intervals between the axle load sensors W1 and W2 and the intervals between the axle load sensors W2 and W3 may be different from each other.

  Each axle load sensor includes two wheel load sensors for measuring the weight (wheel load) applied to one wheel. That is, each axle load sensor has a structure capable of outputting signals of two channels. Specifically, the axle load sensors W1, W2, and W3 respectively detect wheel loads of the right wheels H1R and H2R of the vehicle 200 and wheel loads of the left wheels H1L and H2L of the vehicle 200. And a wheel load sensor. For example, the axle load sensor W1 includes a wheel load sensor W1L and a wheel load sensor W1R, the axle load sensor W2 includes a wheel load sensor W2L and a wheel load sensor W2R, and the axle load sensor W3. Is configured to include a wheel load sensor W3L and a wheel load sensor W3R. The wheel load sensor W1L and the wheel load sensor W1R are arranged side by side in a direction perpendicular to the traveling direction A, and the wheel load sensor W2L and the wheel load sensor W2R are disposed side by side in a direction perpendicular to the traveling direction A, The wheel load sensor W3L and the wheel load sensor W3R are arranged side by side in a direction orthogonal to the traveling direction A.

  Each wheel load sensor has a configuration in which, for example, a loading plate on which one wheel of the vehicle 200 is mounted is stored in the center of the frame. Each wheel load sensor outputs a load when a wheel passes as an analog signal (detection signal). In FIG. 1, six wheel load sensors W1L, W1R, W2L, W2R, W3L, W3R included in the axle load sensors W1, W2, W3 arranged in three rows are illustrated. Is not limited to six, and may be two or more. The number of wheel load sensors included in the axle load sensor is not limited to two, but may be one.

  In the example shown in FIG. 1, the wheel load sensors W1L and W1R included in the axle load sensor W1 are arranged at the most upstream position, and the wheel load sensors W2L and W2R included in the axle load sensor W2 are located downstream of the wheel load sensors W1L and W1R. And wheel load sensors W3L and W3R included in the axle load sensor W3 are disposed at the most downstream.

  Note that the weight measurement system 100 may use an axle load sensor already embedded in the vehicle road 10 as the axle load sensors W1, W2, W3. That is, the axle load sensors W1, W2, and W3 may employ a known configuration.

  FIG. 1 shows functional blocks of the weight measurement system 100. The weight measurement system 100 includes a control unit 11, a storage unit 12, a timer 13, and an A / D converter 14.

  The storage unit 12 is a non-volatile storage medium including, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive). The storage unit 12 stores a control program for causing the control unit 11 to execute various types of processing, vehicle information 121 used for separation determination processing and weight measurement processing, which will be described later, which are executed by the weight measurement system 100, and the like. A specific example of the vehicle information 121 will be described later.

  The A / D converter 14 acquires detection signals (analog data) output from the respective wheel load sensors W1L, W1R, W2L, W2R, W3L, W3R, converts the acquired detection signals into digital data, and controls the control unit. 11 is output.

  The control unit 11 controls the operation of each unit of the weight measurement system 100. The control unit 11 has control devices such as a CPU, a ROM, and a RAM. The ROM is a non-volatile storage medium in which a control program for causing the CPU to execute various processes is stored in advance. The RAM is a volatile or non-volatile storage medium for storing various information, and is used as a temporary storage memory (work area) for various processes executed by the CPU. The control unit 11 controls the weight measurement system 100 by causing the CPU to execute various control programs stored in the ROM or the storage unit 12 in advance.

  As illustrated in FIG. 1, the control unit 11 includes processing units such as a detection signal acquisition unit 111, a wheel weight calculation unit 112, a timeout determination unit 113, a separation determination unit 114, a vehicle separation unit 115, a weight measurement unit 116, and the like. . The control unit 11 functions as each processing unit by executing each processing according to the control program by the CPU. Further, a part or all of the processing units included in the control unit 11 may be configured by an electronic circuit. Note that the control program may be a program for causing a plurality of processors to function as the respective processing units.

  The detection signal acquisition unit 111 acquires, via the A / D converter 14, a detection signal output from the wheel load sensor when the wheel of the vehicle 200 passes through the wheel load sensor. The detection signal acquisition section 111 is an example of the detection signal acquisition section of the present invention. When the detection signal acquisition unit 111 acquires the detection signal, the detection signal acquisition unit 111 stores the vehicle data, which is predetermined information, in the vehicle information 121 of the storage unit 12 in association with the identification information of the wheel load sensor. The vehicle data is information (passing history) indicating that the wheel has passed the wheel load sensor, and is, for example, a passing time indicating the time at which the wheel passed the wheel load sensor. The passage time may be, for example, the time at which the detection signal acquisition unit 111 acquires the detection signal. The passing time is measured by the timer 13. That is, the vehicle data represents a history (reaction history) of the reaction of the wheel load sensor.

  The wheel weight calculation unit 112 calculates the wheel weight based on the detection signal acquired by the detection signal acquisition unit 111. Here, when the wheel of the vehicle 200 passes through the wheel load sensor, the signal level (analog data) of the detection signal output from the wheel load sensor during a period from the time when the wheel starts to be mounted on the wheel load sensor to the time when the vehicle 200 descends is a rule. Change. Therefore, the wheel load calculating unit 112 calculates, for example, the total value of the signal levels of the detection signals of the instantaneous loads output from the wheel load sensor during a period from when the wheel starts to be mounted on the wheel load sensor until the wheel gets off the vehicle, and The value obtained by multiplying the traveling speed of the wheel is calculated as the wheel load.

  Here, the traveling speed of the wheels of the vehicle 200 is determined by a target wheel load sensor (for example, a wheel load sensor W2L) and a wheel load sensor (for example, a wheel load sensor W1L) adjacent to the wheel load sensor W2L on the upstream side. The difference between the time when the detection signal acquisition unit 111 acquires the detection signal from the wheel load sensor W1L and the time when the detection signal acquisition unit 111 acquires the detection signal from the wheel load sensor W2L. It is calculated by dividing by. That is, the traveling speed of the wheels of the vehicle 200 is calculated by dividing the distance by the time from the passage time when the wheel has passed the wheel load sensor W1L to the passage time when the wheel has passed the wheel load sensor W2L. . The wheel weight calculation unit 112 calculates the traveling speed by the above method.

  After calculating the running speed and the wheel load, the wheel load calculating unit 112 stores the information on the running speed and the wheel load for each wheel load sensor in the vehicle information 121 of the storage unit 12 as the vehicle data. Note that the traveling speed is not calculated when there is no wheel load sensor adjacent upstream of the target wheel load sensor. Then, the wheel weight calculation unit 112 is configured to calculate the wheel weight based on the traveling speed. For this reason, the wheel load is not calculated in the most upstream wheel load sensors W1L and W1R for which the traveling speed is not calculated.

  In other words, the wheel load calculation unit 112 determines that the wheel has passed the wheel load sensor located upstream (upstream) of the target wheel load sensor instead of the wheel load sensor in which the target wheel load sensor is arranged at the most upstream position. When there is the predetermined information (passing time) indicating that, the traveling speed and the wheel weight are calculated. The wheel load calculator 112 is an example of the calculator of the present invention.

  The timeout determination unit 113 determines whether the time during which the detection signal acquisition unit 111 does not acquire a detection signal from the wheel load sensor has passed a predetermined time. For example, the time-out determination unit 113 determines the time from the time when the detection signal acquisition unit 111 acquires the previous detection signal from the wheel load sensor to the time when the detection signal is acquired this time, that is, the non-reaction time during which the wheel load sensor does not respond. It is determined whether it is longer than a predetermined time. In other words, the timeout determination unit 113 determines whether the time from when the preceding wheel passes through the wheel load sensor to when the following wheel passes through the wheel load sensor is equal to or longer than the predetermined time. The timeout determination unit 113 is an example of the separation determination unit of the present invention. The predetermined time is obtained, for example, by setting an inter-axis distance (for example, 9 m) to be separated as another vehicle 200 and dividing the inter-axis distance by the traveling speed. The timeout determination unit 113 may set the predetermined time (for example, 100 msec) in the timer 13 and perform a countdown to execute the determination processing. Since the traveling speed is not calculated by the wheel load sensor arranged at the most upstream position, the traveling speed may be set to a minimum speed (for example, 4 km / h) to determine the predetermined time.

  The separation determination unit 114 determines (separation determination) whether or not the wheel load corresponding to the wheel load sensor is the wheel load of the same vehicle 200 for each wheel load sensor. When it is determined that the wheel load corresponding to the wheel load sensor is not the wheel load of the same vehicle 200, the separation determination unit 114 sets a separation flag (for example, “1”) to the wheel load sensor. The separation determination unit 114 is an example of the separation determination unit of the present invention, and the separation flag is an example of the first flag of the present invention.

  For example, the separation determination unit 114 determines the wheel weight of the first wheel (an example of the preceding wheel of the present invention) detected by the wheel load sensor W2L and the second wheel (following the first wheel detected by the wheel load sensor W2L). When the absolute value of the difference from the wheel load of the following wheel of the present invention) is equal to or greater than the first threshold value, the wheel load of the first wheel and the wheel load of the second wheel are the wheel loads of the same vehicle 200. It is determined that this is not the case, and a separation flag is set in the wheel load sensor W2L. The first threshold value is set, for example, to a value three times the smaller wheel load of the wheel loads of the first wheel and the second wheel. When it is determined that the wheel load corresponding to the wheel load sensor is the wheel load of the same vehicle 200, the separation determination unit 114 sets a non-separation flag (for example, “0”) to the wheel load sensor. Note that the separation determination unit 114 may not be configured to set the separation flag “1” when it is determined that the wheel load corresponding to the wheel load sensor is the wheel load of the same vehicle 200.

  Further, for example, when the wheel load sensor W2L determines that the absolute value of the difference between the traveling speed corresponding to the first wheel and the traveling speed corresponding to the second wheel is equal to or greater than the second threshold value, It is determined that the wheel weight of the wheel and the wheel weight of the second wheel are not the wheel weight of the wheel of the same vehicle 200, and the separation flag is set to the wheel load sensor W2L. The second threshold is set to, for example, 10 km / h.

  Further, for example, if the non-reaction time during which the detection signal acquisition unit 111 does not acquire a detection signal from the wheel load sensor W2L is equal to or longer than a predetermined time, the separation determination unit 114 determines that the wheel load sensor W2L To set the separation flag. The predetermined time is set to, for example, 100 msec.

  The vehicle separation unit 115 acquires the separation determination result for each wheel load sensor by the separation determination unit 114, and determines the wheel weight included in the vehicle data based on the total number of separation flags set for each wheel load sensor. Separate for each vehicle 200. The vehicle separation unit 115 is an example of the vehicle separation unit of the present invention. For example, when the total number of wheel load sensors for which the separation flag is set among the six wheel load sensors W1L, W1R, W2L, W2R, W3L, and W3R is equal to or greater than a third threshold, the vehicle separation unit 115 performs separation. It is determined that the wheel to be detected by the wheel load sensor for which the flag is set and the wheel to be detected immediately before are not the wheels of the same vehicle 200, and the wheel weight of one vehicle 200 is separated. The third threshold value is set to, for example, half (“3”) of the total number of wheel load sensors. For example, the vehicle separating unit 115 separates the vehicle 200 when the total number of wheel load sensors for which the separation flag is set reaches “3”. The third threshold is not particularly limited, and may be a majority or a minimum value of the majority (“4” in the above example).

  The weight measurement unit 116 extracts a wheel load corresponding to the separated one vehicle 200 from the vehicle information 121 of the storage unit 12, and measures the weight of the vehicle 200 based on the extracted wheel load. The weight measuring section 116 is an example of the weight measuring section of the present invention. Note that the weight measurement unit 116 may measure the axle load of the vehicle 200 based on the extracted wheel load. As a method of measuring the weight or axle load of the vehicle 200 based on the wheel load, a known method can be used.

  Next, the vehicle information 121 stored in the storage unit 12 will be described with a specific example. FIG. 2A is a diagram illustrating a state in which the vehicle 200 is traveling in front of the axle load sensors W1, W2, and W3. FIG. 2B shows vehicle information 121 corresponding to the state of FIG. 2A. The vehicle information 121 stores vehicle data including a passing time, a traveling speed, and a wheel load for each of the wheel load sensors W1L, W1R, W2L, W2R, W3L, and W3R. The identification information of each wheel load sensor and the vehicle data are stored in association with each other.

  FIG. 3A is a diagram illustrating a state in which a first wheel (preceding wheel) of vehicle 200 has passed axle load sensors W1, W2, W3, and a second wheel (following wheel) has passed axle load sensor W1. FIG. 3B shows vehicle information 121 corresponding to the first wheel in the state of FIG. 3A. The traveling speed and the wheel load are not calculated by the wheel load sensors W1L and W1R arranged at the most upstream, so that only the passing time is stored. In the wheel load sensors W2L, W2R, W3L, W3R arranged downstream of the wheel load sensors W1L, W1R, the passing time, the traveling speed, and the wheel load are stored.

  FIG. 3C is a diagram showing vehicle information 121 corresponding to the second wheel in the state of FIG. 3A. The traveling speed and the wheel load are not calculated by the wheel load sensors W1L and W1R arranged at the most upstream, so that only the passing time is stored.

  FIG. 4A is a diagram illustrating a state where the first wheel of the vehicle 200 has passed the axle load sensors W1, W2, W3, and the second wheel has passed the axle load sensors W1, W2. FIG. 4B shows vehicle information 121 corresponding to the second wheel in the state of FIG. 4A. The traveling speed and the wheel load are not calculated by the wheel load sensors W1L and W1R arranged at the most upstream, so that only the passing time is stored. The wheel load sensors W2L and W2R disposed downstream of the wheel load sensors W1L and W1R store the passing time, the traveling speed, and the wheel load.

  FIG. 5 shows vehicle information 121 corresponding to the second wheel in a state where the second wheel of the vehicle 200 has passed the axle load sensors W1, W2, W3. When the second wheel passes through the axle load sensors W1, W2, W3, the passing time, the traveling speed, and the wheel load are stored in the wheel load sensors W2L, W2R, W3L, W3R.

  In the above description, for convenience, the vehicle information 121 corresponding to the first wheel and the vehicle information 121 corresponding to the second wheel are separately shown. However, in actuality, the vehicle information 121 includes a time series. The passing time, the traveling speed, and the wheel load are sequentially stored. For example, as shown in FIG. 6, the traveling speed and the wheel load are sequentially stored for each wheel load sensor according to the time series of the passing time. FIG. 6 shows vehicle information 121 corresponding to the wheel load sensor W2L.

  In the above example, as a first method, for example, the separation determination unit 114 detects the wheel load m12L of the first wheel detected by the wheel load sensor W2L (see FIGS. 3B and 6) and the wheel load sensor W2L. When the absolute value (| m12L-m22L |) of the difference from the wheel load m22L of the second wheel (see FIGS. 5 and 6) is equal to or greater than the first threshold value, the wheel load m12L of the first wheel and the second wheel It is determined that the wheel load m22L is not the wheel load of the wheel of the same vehicle 200, and a separation flag (for example, “1”) is set to the wheel load sensor W2L. When the absolute value (| m12L-m22L |) is less than the first threshold value, the separation determination unit 114 determines that the wheel weight m12L of the first wheel and the wheel weight m22L of the second wheel are equal to the wheel weight of the same vehicle 200. It is determined that the vehicle is heavy, and a non-separation flag (for example, “0”) is set to the wheel load sensor W2L.

  As a second method, for example, in the wheel load sensor W2L, the separation determination unit 114 determines that the traveling speed v12 (see FIGS. 3B and 6) corresponding to the first wheel and the traveling speed v22 corresponding to the second wheel. When the absolute value (| v12−v22 |) of the difference from the second wheel (see FIGS. 5 and 6) is equal to or greater than the second threshold, the wheel load m12L of the first wheel and the wheel load m22L of the second wheel are the same vehicle 200. It is determined that the wheel weight is not the wheel weight of the wheel, and a separation flag (for example, “1”) is set in the wheel weight sensor W2L. When the absolute value (| v12-v22 |) is less than the second threshold, the separation determination unit 114 determines that the wheel load m12L of the first wheel and the wheel load m22L of the second wheel are the same as those of the wheels of the vehicle 200. It is determined that the vehicle is heavy, and a non-separation flag (for example, “0”) is set to the wheel load sensor W2L. The separation determination unit 114 sets a separation flag or a non-separation flag by, for example, the first method or the second method.

  The separation determination unit 114 compares the vehicle information 121 corresponding to the first wheel and the vehicle information 121 corresponding to the second wheel in each wheel load sensor, performs the separation determination, and sets a separation flag. The first wheel and the second wheel do not represent the front wheel and the rear wheel of the vehicle, but are compared when performing the separation determination with respect to the wheel load sensor, and are continuously detected by the wheel load sensor. Two wheels.

  FIG. 7 is a diagram illustrating a result of the separation determination for each wheel load sensor. FIG. 7 shows three examples. In Example 1, no separation flag is set for each of the wheel load sensors W2L, W2R, W3L, W3R, and the total number of separation flags “1” is “0”. In Example 1, as a result of the separation determination corresponding to the first wheel and the second wheel, for example, the vehicle information 121 (see FIG. 3B and FIG. 6) corresponding to the first wheel of the vehicle 200 in the above-described example and the second wheel 9 illustrates a result of separation determination set based on the corresponding vehicle information 121 (see FIGS. 5 and 6). In Example 1, since there is no wheel load sensor for which the separation flag is set, the vehicle separating unit 115 does not separate the wheel load for each vehicle. That is, the vehicle separating unit 115 does not separate the wheel loads m12L and m22L, and determines that the first wheel and the second wheel are the wheels of the same vehicle 200.

  In Example 2, as a result of the separation determination corresponding to the second wheel and the third wheel, for example, the vehicle information 121 (see FIGS. 5 and 6) corresponding to the second wheel (rear wheel) of the vehicle 200 and the following of the vehicle 200 9 shows a result of separation determination set based on vehicle information 121 (not shown) corresponding to the third wheel (front wheel) of the vehicle 300 (see FIG. 8). In Example 2, the separation flag “1” is set for the wheel load sensors W2L, W2R, W3L, and W3R. For example, as shown in FIG. 8, the third wheel (front wheel) of the vehicle 300 passes through the wheel load sensors W1L, W1R, W2L, W2R, W3L, W3R and the wheel load of the second wheel of the vehicle 200 (FIG. 5). When the absolute value of the difference between the wheel weight of the third wheel (not shown) and the third wheel is equal to or greater than the first threshold, the separation determination unit 114 outputs the separation flag to the wheel load sensors W2L, W2R, W3L, and W3R. Set “1”. Here, the total number of separation flags is “4”. In this case, when the third threshold value is set to “3”, the total number of wheel load sensors for which the separation flag is set is equal to or greater than the third threshold value. When the total number of weight sensors reaches three, the wheel weight is separated for each vehicle. For example, the vehicle separating unit 115 separates the wheel load for each vehicle at this time because the total number reaches three when the wheels of the vehicle 200 pass the wheel load sensors W3L and W3R. As a result, the vehicle separating unit 115 determines that the second wheel and the third wheel are not the wheels of the same vehicle.

  Here, when each wheel load sensor is operating normally, the separation flag and the non-separation flag are appropriately set as shown in Example 1 or Example 2 of FIG. On the other hand, if the wheel load sensor fails, the wheel load sensor may not operate normally. When the wheel load sensor fails, for example, the signal level of the detection signal output from the wheel load sensor becomes lower than the original signal level. For this reason, the values of the traveling speed and the wheel weight calculated based on the detection signal become smaller than the original values. Then, even when the absolute value of the difference between the wheel loads is originally greater than or equal to the first threshold value, the absolute value of the difference between the wheel speeds is less than the first threshold value, or when the absolute value of the difference between the traveling speeds is originally greater than or equal to the second threshold value. Even if it does, it may be less than the second threshold.

  In this case, as shown in Example 3 in FIG. 7, in the failed wheel load sensor (for example, the wheel load sensor W2R), the non-separation flag “0” is set even if the separation flag “1” is originally set. Will be set. Further, even if the non-separation flag “0” is originally set due to the failure of the wheel load sensor, the separation flag “1” may be set. In such a case, if the configuration is such that the wheel load is separated based on the result of the separation determination of one wheel load sensor, appropriate weight measurement should be performed when any of the wheel load sensors fails. Can not be done.

  In this regard, the weight measurement system 100 according to the embodiment of the present invention is configured to separate the wheel load for each vehicle when the total number of wheel load sensors for which the separation flag is set is equal to or greater than the third threshold. Therefore, for example, even when one wheel load sensor fails, it is possible to appropriately measure the weight.

[Separation judgment processing]
Hereinafter, an example of the procedure of the separation determination process executed by the control unit 11 of the weight measurement system 100 will be described with reference to the flowchart of FIG. The separation determination process is performed for each wheel load sensor. That is, the control unit 11 performs the separation determination process on each of the wheel load sensors W1L, W1R, W2L, W2R, W3L, and W3R.

  The present invention can be considered as an invention of a vehicle separation method that executes one or more steps included in the separation determination processing. Also, one or more steps included in the separation determination processing described here may be appropriately omitted. The steps in the separation determination process may be executed in a different order as long as the same operation and effect can be obtained. Furthermore, a case will be described here as an example where each step in the separation determination processing is executed by the control unit 11, but in other embodiments, each step in the separation determination processing is distributed by a plurality of processors. It may be performed.

  In step S101, the control unit 11 (detection signal acquisition unit 111) acquires a detection signal output from a wheel load sensor to be determined in the separation determination process.

  In step S <b> 102, the control unit 11 (the detection signal acquisition unit 111) stores, in the vehicle information 121 of the storage unit 12, the passage time of the wheel corresponding to the time when the detection signal was acquired.

  In step S103, the control unit 11 (timeout determination unit 113) resets the timer 13 set to a predetermined time (for example, 100 msec). That is, each time the detection signal acquisition unit 111 acquires the detection signal output from the wheel load sensor, the detection signal acquisition unit 111 acquires the current detection signal from the time at which the detection signal acquisition unit 111 previously acquired the detection signal from the wheel load sensor. The time until the time (no response time) is reset, and measurement of the time until the detection signal acquisition unit 111 acquires the next detection signal from the wheel load sensor is started. When the non-reaction time is equal to or longer than the predetermined time, a timeout process (see FIG. 10) described later is executed.

  In step S104, the control unit 11 (wheel weight calculation unit 112) determines whether or not the wheel load sensor is the wheel load sensor arranged at the most upstream position. If the wheel load sensor is not the wheel load sensor arranged at the most upstream position (S104: NO), the process proceeds to step S105.

  If the wheel load sensor is the wheel load sensor arranged at the most upstream position (S104: YES), the process ends, and the separation flag “1” and the non-separation flag “0” are not set in the wheel load sensor.

  In step S105, the control unit 11 (wheel weight calculation unit 112) determines whether or not there is a passage history in the wheel load sensor on the upstream side (front side) of the wheel load sensor. Specifically, the control unit 11 determines whether or not the passing time at which the wheel passed the wheel load sensor in front of the wheel load sensor is stored in the vehicle information 121. If the passage history exists (S105: YES), the process proceeds to step S106.

  If the passage history does not exist (S105: NO), the process ends, and the separation flag “1” and the non-separation flag “0” are not set in the wheel load sensor.

  In step S106, the control unit 11 (wheel weight calculation unit 112) calculates the traveling speed of the wheels of the vehicle 200 based on the passage time corresponding to the wheel load sensor and the passage time corresponding to the front wheel load sensor. I do. The control unit 11 (wheel weight calculation unit 112) calculates the wheel weight of the wheel based on the detection signal output from the wheel weight sensor and the traveling speed. The control unit 11 stores vehicle data including the calculated traveling speed and wheel weight in the vehicle information 121.

  In step S107, the control unit 11 (separation determination unit 114) determines the vehicle data immediately before the vehicle information 121, that is, the traveling speed and wheel weight of the wheel detected immediately before by the wheel load sensor to be determined in the separation determination process. Is determined in the vehicle information 121. If the immediately preceding vehicle data exists (S107: YES), the process proceeds to step S108. For example, as shown in FIG. 6, in the wheel load sensor W2L to be determined in the separation determination process, when the current time is the passing time t22, the traveling speed “v12” and the wheel load of the wheel detected at the immediately preceding passing time t12. Since “m12L” exists, the process proceeds to S108.

  If the immediately preceding vehicle data does not exist (S107: NO), the process ends, and the separation flag “1” and the non-separation flag “0” are not set in the wheel load sensor.

  In step S108, the control unit 11 (separation determination unit 114) determines whether the absolute value of the difference between the vehicle data calculated at the current time and the vehicle data calculated immediately before is equal to or greater than a threshold. For example, as the first method, as shown in FIG. 6, in the wheel load sensor W2L, the control unit 11 sets the wheel load “m22L” calculated at the current time “t22” and the immediately preceding passing time “t12”. It is determined whether or not the calculated absolute value (| m12L−m22L |) of the difference from the wheel load “m12L” is equal to or greater than a first threshold value. If the absolute value is equal to or greater than the first threshold (S108: YES), the process proceeds to step S109, and if the absolute value is less than the first threshold (S108: NO), the process proceeds to step S110.

  In addition, as the second method, for example, as shown in FIG. 6, in the wheel load sensor W2L, the control unit 11 determines the traveling speed “v22” calculated at the current time “t22” and the immediately preceding passing time “t12”. It is determined whether or not the absolute value (| v12−v22 |) of the difference from the calculated traveling speed “v12” is equal to or greater than the second threshold. If the absolute value is greater than or equal to the second threshold (S108: YES), the process proceeds to step S109, and if the absolute value is less than the second threshold (S108: NO), the process proceeds to step S110.

  In step S109, the control unit 11 (separation determination unit 114) sets the separation flag “1” to the wheel load sensor to be determined in the separation determination process. In step S110, the control unit 11 (separation determination unit 114) sets the non-separation flag “0” to the wheel load sensor to be determined in the separation determination process. As described above, the separation determination process is performed for each wheel load sensor.

  Hereinafter, an example of the procedure of the timeout process will be described with reference to the flowchart of FIG. The timeout process is included in the separation determination process.

  Steps S201 to S203 are the same as steps S101 to S103 shown in FIG. That is, in step S201, the control unit 11 (the detection signal acquisition unit 111) acquires a detection signal output from the wheel load sensor to be determined in the separation determination process. In step S202, the control unit 11 (the detection signal acquisition unit 111) stores the passage time of the wheel corresponding to the time at which the detection signal was acquired in the vehicle information 121 of the storage unit 12. In step S203, the control unit 11 (timeout determination unit 113) resets the timer 13 set to a predetermined time, and outputs the current detection signal from the time when the detection signal obtaining unit 111 previously obtained the detection signal from the wheel load sensor. Measurement of the time until the acquired time, that is, the non-reaction time during which the wheel load sensor does not respond is started.

  In step S204, the control unit 11 (timeout determination unit 113) determines whether the non-reaction time is equal to or longer than the predetermined time. If the non-reaction time is equal to or longer than the predetermined time (S204: YES), the process proceeds to step S205, and if the non-reaction time is less than the predetermined time (S204: NO), the process ends.

  In step S205, the control unit 11 (the separation determination unit 114) sets the separation flag “1” to the wheel load sensor to be determined in the separation determination process.

  As described above, the timeout process is executed for each wheel load sensor. Note that the separation determination process illustrated in FIG. 9 and the timeout process illustrated in FIG. 10 are executed in parallel, for example, every time the detection signal acquisition unit 111 acquires a detection signal output from the wheel load sensor.

[Weight measurement processing]
Hereinafter, an example of the procedure of the weight measurement process executed by the control unit 11 of the weight measurement system 100 will be described with reference to the flowchart of FIG. The weight measurement process is executed based on the result of the above-described separation determination process determined for each wheel load sensor. That is, the control unit 11 measures the weight of one vehicle 200 based on the number of separation flags for each of the wheel load sensors W1L, W1R, W2L, W2R, W3L, and W3R.

  In step S301, the control unit 11 (the vehicle separation unit 115) acquires the separation determination result (see FIG. 7) for each wheel load sensor by the separation determination unit 114.

  In step S302, the control unit 11 (vehicle separation unit 115) determines whether or not the number of wheel load sensors for which the separation flag is set is equal to or greater than a third threshold. If the number of wheel load sensors for which the separation flag has been set is equal to or greater than the third threshold value (S302: YES), the process proceeds to step S303, and if the number of wheel load sensors for which the separation flag has been set is less than the third threshold value. If there is (S302: NO), the process returns to step S301.

  In step S303, the control unit 11 (vehicle separation unit 115) determines that the wheel to be detected by the wheel load sensor for which the separation flag is set and the wheel to be detected immediately before are not the wheels of the same vehicle 200. Then, the wheel load of one vehicle 200 is separated.

  In step S304, the control unit 11 (weight measuring unit 116) extracts a wheel load corresponding to the separated one vehicle 200 from the vehicle information 121 of the storage unit 12, and executes the vehicle control based on the extracted wheel load. Measure the weight or axle weight of 200.

  As described above, the weight measurement system 100 calculates the weight of the vehicle 200 by separating the wheel load for each vehicle based on the detection signal of the wheel load sensor. In other words, according to the weight measurement system 100, the vehicle 200 can be separated by the axle load sensor for detecting the wheel load without requiring a separate device for separating the vehicle 200. Each weight can be measured.

  In addition, the weight measurement system 100 is configured to perform vehicle separation when the total number of wheel load sensors for which the separation flag is set is equal to or greater than the third threshold value. However, the vehicle can be appropriately separated, and the weight of each vehicle can be measured.

  The weight measurement system according to the present invention is not limited to the above configuration, and may have the following configuration.

  As another embodiment, for example, as shown in FIG. 12, the wheel load sensors may be arranged in two rows in the traveling direction A. According to the configuration shown in FIG. 12, the traveling speed and the wheel weight corresponding to the wheel load sensors W2L and W2R can be calculated based on the detection results of the wheel load sensors W1L and W1R and the detection results of the wheel load sensors W2L and W2R. , The separation of the vehicle 200 and the calculation of the weight can be performed. The weight measuring system 100 may have a configuration in which four or more rows of wheel load sensors are arranged in the traveling direction A.

  As another embodiment, the number of wheel load sensors included in the axle load sensor may be one. For example, in the configuration shown in FIG. 1, the weight measurement system 100 includes the axle load sensor W1 provided with one wheel load sensor W1L, the axle load sensor W2 provided with one wheel load sensor W2L, and the axle load sensor W3 provided with A configuration including one wheel load sensor W3L may be used. In this case, the weight measurement system 100 may use the same value as the detection result of the wheel weight sensors W1L, W2L, W3L for the left wheels H1L, H2L as the detection result for the right wheels H1R, H2R of the vehicle 200. . As described above, when a configuration is used in which the detection result of the wheel load sensor corresponding to one of the right and left wheels is used as the detection result corresponding to the other wheel, for example, as illustrated in FIG. May be arranged.

  Also in each of the above-described embodiments, the weight measurement system 100 can calculate the weight of the vehicle 200 by separating the wheel load for each vehicle based on the detection signal of the wheel load sensor, and thus calculating the weight of the vehicle 200 as a whole. The configuration can be simplified.

  Note that the weight measurement system according to the present invention may be configured by one computer, or may be configured by a computer system in which a plurality of computers operate in cooperation. Further, various processes executed by the weight measurement system may be executed in a distributed manner by one or a plurality of processors.

10: vehicle road 11: control unit 12: storage unit 13: timer 14: A / D converter 100: weight measurement system 111: detection signal acquisition unit 112: wheel weight calculation unit 113: timeout determination unit 114: separation determination unit 115 : Vehicle separation unit 116: Weight measurement unit 121: Vehicle information W1: Axle load sensor W1L: Wheel load sensor W1R: Wheel load sensor W2: Axle load sensor W2L: Wheel load sensor W2R: Wheel load sensor W3: Axle load sensor W3L: Wheel load sensor W3R: Wheel load sensor

Claims (8)

A detection signal acquisition unit that acquires a detection signal for each wheel output from a plurality of wheel load sensors arranged at predetermined intervals in the traveling direction of the vehicle,
Based on the detection signal acquired by the detection signal acquisition unit, a calculation unit that calculates the traveling speed and wheel weight of the wheel,
Based on the running speed and the wheel weight of the preceding wheel calculated by the calculating unit and the running speed and the wheel weight of the following wheel calculated by following the calculating unit, For each wheel load sensor, a separation determination unit that determines whether the wheel load corresponding to the wheel load sensor is the same vehicle wheel load,
A vehicle separation unit that separates the wheel weight calculated by the calculation unit for each vehicle based on a determination result of the separation determination unit for each of the plurality of wheel load sensors;
A weight measuring unit that measures the weight of the vehicle based on the wheel weight of each vehicle separated by the vehicle separating unit;
A weight measurement system comprising: The separation determination unit may be configured to determine whether an absolute value of a difference between the wheel load of the preceding wheel corresponding to the wheel load sensor and the wheel load of the following wheel corresponding to the wheel load sensor is equal to or greater than a first threshold. Determining that the wheel load of the preceding wheel and the wheel load of the following wheel are not the same wheel load of the vehicle, and setting a first flag to the wheel load sensor;
The weight measurement system according to claim 1. The separation determination unit is configured to determine that an absolute value of a difference between the traveling speed of the preceding wheel corresponding to the wheel load sensor and the traveling speed of the following wheel corresponding to the wheel load sensor is equal to or greater than a second threshold. Determining that the wheel load of the preceding wheel and the wheel load of the following wheel are not the same wheel load of the vehicle, and setting a first flag to the wheel load sensor;
The weight measurement system according to claim 1. The separation determination unit is configured to, when the time from when the preceding wheel passes through the wheel load sensor to when the following wheel passes through the wheel load sensor is equal to or longer than a predetermined time, the wheel load of the preceding wheel is determined. And determining that the wheel load of the following wheel is not the same as the wheel load of the vehicle, and setting a first flag to the wheel load sensor.
The weight measurement system according to claim 1. The vehicle separating unit is configured to, when the total number of wheel load sensors for which the first flag is set among the plurality of wheel load sensors is equal to or greater than a third threshold value, calculate the wheel load calculated by the calculation unit to the vehicle. Separate one by one,
The weight measurement system according to any one of claims 2 to 4. The third threshold value is set to a value of half or a majority of the total number of the wheel load sensors,
The weight measurement system according to claim 5. The calculation unit calculates a distance between a first wheel load sensor and a second wheel load sensor adjacent downstream of the first wheel load sensor by a passing time at which the preceding wheel passes through the first wheel load sensor. By dividing by the time until the passing time when the preceding wheel passed through the second wheel weight sensor, to calculate the traveling speed of the wheel corresponding to the second wheel weight sensor,
The calculation unit further multiplies the total value of the signal levels of the detection signals output from the second wheel load sensor by the traveling speed of the wheel, so as to correspond to the second wheel load sensor. Calculate the wheel weight of the wheel,
The weight measurement system according to any one of claims 1 to 6. A detection signal acquisition step of acquiring a detection signal for each wheel output from a plurality of wheel weight sensors arranged at predetermined intervals in the traveling direction of the vehicle,
A calculating step of calculating a traveling speed and a wheel load of the wheel based on the detection signal obtained in the detection signal obtaining step;
Based on the running speed and the wheel weight of the preceding wheel calculated in advance in the calculating step, and based on the running speed and the wheel weight of the following wheel calculated in the following step in the calculating step, For each wheel load sensor, a separation determination step of determining whether the wheel load corresponding to the wheel load sensor is the same vehicle wheel load,
A vehicle separation step of separating the wheel load calculated in the calculation step for each vehicle based on a determination result of the separation determination step for each of the plurality of wheel load sensors;
A weight measuring step of measuring a weight of the vehicle based on the wheel weight of each of the vehicles separated in the vehicle separating step;
A vehicle separation method including:

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