Load weight measuring system and load weight measuring method

Abstract

To provide a loading weight measuring system having a manual measuring function and an automatic measuring function and capable of measuring the loading weight of a vehicle with high accuracy.SOLUTION: In the loaded weight measurement system, a control unit 11 of an in-vehicle device that measures a loaded weight based on a signal output from a sensor unit that outputs a signal of a strain detected on an axle has a function of manual measurement in which the measurement of the loaded weight is started by performing a measurement start operation on an input unit, and automatic measurement in which the measurement is started at a predetermined timing after the vehicle stops. When the measurement start operation is not performed, it is determined whether or not the crew gets off the vehicle, and when it is determined that the crew gets off the vehicle, the automatic measurement is stopped, and a reference point to a signal output from the sensor unit is reset to newly start the automatic measurement.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a loaded weight measurement system and a loaded weight measurement method. [Background technology]

[0002] Generally, when a vehicle used to transport goods is operated with a load exceeding the permitted weight (i.e., overloaded), it not only leads to traffic accidents such as rollovers and poor braking performance, but also contributes to the deterioration of the vehicle and damage to the road surface. For this reason, the load weight on the loading platform is legally limited and mandated by vehicle operation regulations.

[0003] Conventionally, the load weight of a cargo transport vehicle has been measured by placing the vehicle to be measured on a platform scale known as a kankan (weight scale). However, this method requires high equipment costs and a large installation space. For this reason, in recent years, load weight measurement devices (so-called weight scales) that are mounted on the vehicle itself to measure the load weight have been provided (see, for example, Patent Document 1). The weight scale disclosed in Patent Document 1 has load sensors, such as strain gauge sensors, attached to both the left and right ends of the front and rear axles, and measures the load weight by summing the outputs of these load sensors, which are proportional to the loads acting on the front, rear, left, and right tires. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-025662 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the load weight measuring device disclosed in Patent Document 1, weight measurement (also referred to as "manual measurement" in this specification) is initiated by the driver performing a measurement start operation on the device (for example, by pressing a button) before loading or unloading an object onto or from a vehicle. Therefore, if the driver forgets to perform the measurement start operation on the device, there is a problem that the weight of the object that has been loaded onto the vehicle up to that point cannot be measured. To address this, it is possible to start measuring the load weight when the vehicle stops and to end measuring the load weight when the vehicle starts moving, but this is not preferable because there is a risk that the output of the load sensor will drift due to vehicle swaying or temperature changes.

[0006] Furthermore, when attempting to measure the load weight of a vehicle with high accuracy, it is preferable to reset the reference point for the signal output by each load sensor (e.g., by zero point correction) immediately before loading the load onto the vehicle, and to end the measurement immediately after loading the load. That is, it is necessary to perform a measurement start operation (e.g., by pressing a button) immediately before loading the load, and a measurement end operation (e.g., by pressing a button) immediately after loading. However, as mentioned above, there are cases where the driver forgets to perform the input operation, so it is preferable to have both manual and automatic measurement functions. That is, it is desirable for conventional devices and systems related to measuring load weight to have both manual and automatic measurement functions and be able to measure the load weight of a vehicle with high accuracy.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a load weight measurement system and a load weight measurement method that have manual measurement functions and automatic measurement functions and can measure the load weight of a vehicle with high accuracy. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the load weight measurement system according to the present invention comprises: A load weight measurement system for measuring a load weight of a vehicle, a sensor unit attached to an axle of the vehicle and outputting a signal representing strain detected on the axle; an on-board device that measures the load weight based on a signal output from the sensor unit; an input unit connected to the on-board device and configured to accept an input operation related to the measurement of the load weight, The vehicle-mounted device The device has a function of manual measurement, which starts measuring the load weight when a measurement start operation for starting measurement of the load weight is performed on the input unit, and an automatic measurement, which starts measuring the load weight at a predetermined timing after the vehicle has stopped, determining whether or not the measurement start operation has been performed on the input unit after the start of the automatic measurement; When the measurement start input operation is performed on the input unit, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the manual measurement is started; If the measurement start input operation has not been performed on the input unit, it is determined whether or not the crew has disembarked from the vehicle, and if it is determined that the crew has disembarked from the vehicle, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the automatic measurement is started anew. It must be a load weight measurement system.

[0009] In order to achieve the above-mentioned object, a method for measuring a load weight according to the present invention includes: 1. A method for measuring a load weight of a vehicle based on a signal output from a sensor unit attached to an axle of the vehicle and outputting a signal of strain detected on the axle, comprising: starting automatic measurement of the load weight at a predetermined timing after the vehicle has stopped; After the start of the automatic measurement, it is determined whether or not a measurement start operation has been performed on an input unit that accepts input operations related to the measurement of the loaded weight, including a measurement start operation for starting manual measurement of the loaded weight; When the measurement start operation is performed on the input unit, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the manual measurement is started; If the measurement start operation has not been performed on the input unit, it is determined whether or not the crew has disembarked from the vehicle, and if it is determined that the crew has disembarked from the vehicle, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the automatic measurement is started anew. It must be a method of measuring loaded weight. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a loaded weight measurement system and a loaded weight measurement method that have a manual measurement function and an automatic measurement function and can measure the loaded weight of a vehicle with high accuracy.

[0011] Note that manual measurement refers to the load weight being measured by an on-board device after the driver performs input operations related to the measurement of the load weight.

[0012] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a block diagram showing an example of the configuration of a loaded weight measurement system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing an example of the configuration of the load sensor unit shown in FIG. [Figure 3] FIG. 3 is a front view showing an example of the configuration of a vehicle equipped with a loaded weight measurement system. [Figure 4] FIG. 4 is a right side view illustrating an example of the configuration of the vehicle shown in FIG. [Figure 5] FIG. 5 is a bottom view illustrating an example of the configuration of the vehicle shown in FIG. [Figure 6] FIG. 6 is a flowchart showing the advance preparation process in the load weight measurement system. [Figure 7]FIG. 7 is a flowchart showing a part of an example of an operation relating to the start of measurement of a loaded weight in the loaded weight measurement system. [Figure 8] FIG. 8 is a flowchart showing a part of an example of an operation relating to the start of measurement of a loaded weight in the loaded weight measurement system. [Figure 9] FIG. 9 is a flowchart showing an example of a provisional loaded weight calculation process in an operation related to the start of loaded weight measurement in the loaded weight measurement system. [Figure 10] FIG. 10 is a flowchart showing an example of a vehicle stability determination process in an operation related to the start of measurement of a loaded weight in the loaded weight measurement system. [Figure 11] FIG. 11 is a flowchart showing an example of an automatic measurement start process in an operation related to the start of measurement of a loaded weight in the loaded weight measurement system. [Figure 12] FIG. 12 is a flowchart showing an example of a loaded weight calculation process in an operation related to the start of measurement of a loaded weight in the loaded weight measurement system. [Figure 13] FIG. 13 is a flowchart showing an example of a vehicle dismount determination process in an operation related to the start of measurement of a loaded weight in the loaded weight measurement system. [Figure 14] FIG. 14 is a flowchart showing a part of an example of an operation relating to the end of measurement of a loaded weight in the loaded weight measurement system. [Figure 15] FIG. 15 is a flowchart showing an example of load data averaging processing in an operation related to the end of measurement of a loaded weight in the loaded weight measurement system. [Figure 16] FIG. 16 is a flowchart showing an example of a passenger-on-board determination process in an operation related to the completion of measurement of a loaded weight in the loaded weight measurement system. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a loaded weight measurement system and a loaded weight measurement method according to an embodiment of the present invention will be described with reference to the drawings.

[0015] The present invention is not limited to the embodiments described below, and can be appropriately modified, improved, etc. In addition, the material, shape, size, number, location, etc. of each component in the embodiments described below are arbitrary as long as they can achieve the present invention, and are not limited thereto.

[0016] <Configuration of the load weight measurement system> First, an example of the configuration of a load weight measurement system will be described. As shown in Fig. 1, the load weight measurement system includes an electronic control unit 10 that is mounted on a vehicle as the main body of the on-board device. Also connected to this electronic control unit 10 are a recording card 21, a vehicle information input unit 22, a vehicle power supply 23, a wireless communication unit 24, four load sensor units 25A to 25D, a position information acquisition unit 26, a setting PC 27, a start button 28, an end button 29, and a clear button 30.

[0017] The electronic control device 10 also includes a control unit 11, a main memory 12, an alarm output unit 13, a display unit 14, input / output I / Fs (interfaces) 15 and 16, and a power supply unit 17.

[0018] The record card 21 is a non-volatile memory card that is detachable from the electronic control device 10 and is prepared individually for each driver. This record card 21 can be used to record driving record information including information related to the transport quality of luggage.

[0019] The vehicle information input unit 22 can acquire information representing the state of the vehicle, such as a signal indicating whether the ignition is on or off, a vehicle speed signal, and input it to the electronic control unit 10.

[0020] The vehicle power supply 23 is a power supply such as a battery mounted on the vehicle, and is capable of supplying a predetermined amount of DC power to the electronic control device 10 and other on-board devices.

[0021] The wireless communication unit 24 can be used to connect the electronic control unit 10 to a management device outside the vehicle, such as a data center, by wireless communication.

[0022] Load sensor units 25A, 25B, 25C, and 25D are installed so as to measure the magnitude of the load applied to the suspensions supporting the wheels at each of the front left (FL), front right (FR), rear left (RL), and rear right (RR) positions, respectively.

[0023] The position information acquisition unit 26 can acquire information indicating the latitude / longitude of the current position of the vehicle using, for example, a GPS (Global Positioning System) receiver.

[0024] The setting computer 27 can be connected to the electronic control device 10 as needed when managing the functions of the electronic control device 10 or performing maintenance. For example, the setting computer 27 can be used to register necessary data in a table on the electronic control device 10 or to adjust parameters such as various threshold values ​​used to control the electronic control device 10.

[0025] When the driver of the vehicle 41 presses the start button 28, measurement of the load weight of the vehicle 41 begins.

[0026] When the driver of the vehicle 41 presses the end button 29, the measurement of the load weight of the vehicle 41 is ended.

[0027] When the clear button 30 is pressed by the driver of the vehicle 41, the accumulated weight stored in the main body memory 12 is reset to a zero value (zero clear).

[0028] The control unit 11 is configured with electronic circuits mainly including a microcomputer, and executes a program prepared in advance to realize various control functions required for the electronic control device 10. The program includes a function to calculate the load weight and total weight of the vehicle based on the loads detected by the four load sensor units 25A to 25D.

[0029] The main body memory 12 includes a non-volatile memory (such as an EEPROM) in which various predetermined constant data and programs required for the operation of the electronic control device 10 are written, and a memory (RAM) for storing temporary data.

[0030] The alarm output unit 13 is used to notify the driver of the occurrence of an abnormality using an alarm lamp, buzzer, or the like built into the electronic control unit 10.

[0031] The display unit 14 is provided with a flat display that is positioned so that it can be easily viewed from the driver's position. Color images, text information, and the like can be displayed on the two-dimensional screen of this flat display as needed.

[0032] The input / output I / F 15 performs signal processing for the control unit 11 to access data on the recording card 21 and controls signal input from the vehicle information input unit 22. The input / output I / F 15 also controls signal input / output between the control unit 11 and the start button 28, end button 29, and clear button 30.

[0033] The input / output I / F 16 controls the input and output of signals between the wireless communication unit 24, the position information acquisition unit 26, the load sensor units 25A to 25D, and the setting personal computer 27 and the control unit 11.

[0034] The power supply unit 17 generates stable DC power based on the power supplied from the vehicle power supply 23. The DC power output by the power supply unit 17 is supplied as power to each circuit inside the electronic control device 10 and each load sensor unit 25A to 25D.

[0035] <Load sensor unit configuration> Next, a description will be given of an example of the configuration of the load sensor unit 25. Each of the load sensor units 25A to 25D shown in FIG.

[0036] As shown in FIG. 2, the load sensor unit 25 includes a strain detection element 31, a dedicated IC (ASIC) 32, a temperature sensor 33, an MCU (microcontroller or microcomputer) , an input / output I / F 35, and a power supply circuit .

[0037] The strain detection element 31 detects the amount of strain caused by the load applied to the location where it is installed. The dedicated IC 32 generates an electrical signal of a voltage (V) corresponding to the amount of strain detected by the strain detection element 31, i.e., the load.

[0038] The temperature sensor 33 detects the temperature inside the load sensor unit 25 in the vicinity of the strain detection element 31, and outputs an electrical signal according to the internal temperature.

[0039] The MCU 34 generates data representing the magnitude of the load detected by the strain detection element 31 (hereinafter also referred to as "load data") and data representing the internal temperature detected by the temperature sensor 33. The load data and internal temperature detection data generated by the MCU 34 are input to the electronic control device 10 via the input / output I / F 35.

[0040] <Vehicle configuration to be measured> Next, an example of the configuration of a vehicle 41 to be measured will be described. As shown in Fig. 3, an electronic control device 10 is installed near the driver's seat of the vehicle 41. Four load sensor units 25A, 25B, 25C, and 25D connected to the electronic control device 10 are installed near a left front wheel 44A, a right front wheel 44B, a left rear wheel 44C, and a right rear wheel 44D, respectively (see Figs. 4 and 5).

[0041] Various items of luggage are loaded in the internal space of the loading platform 42 of the vehicle 41. The load at each position varies depending on the luggage loading situation. Furthermore, the inclination angle of the axle 43A, the inclination angle of the axle 43B, and the inclination angle of the axle in the front-rear direction vary depending on the balance of the load at each position.

[0042] By installing multiple load sensor units 25A, 25B, 25C, and 25D at appropriate positions, it is possible to calculate the load weight and total weight of vehicle 41 with relatively high accuracy based on the load detected by each load sensor unit 25A to 25D, even if each axle 43A, 43B is tilted.

[0043] <Load Weight Measurement System Operation> Next, an example of the operation of the loaded weight measurement system including an example of a loaded weight measurement method will be described.

[0044] [Preparation] First, the preparation process will be described with reference to FIG. In the load weight measurement system, it is assumed that before using the electronic control unit 10 for the first time, data required for the operation of the electronic control unit 10 is input and registered using the setting personal computer 27. Therefore, if the required data has been registered in the electronic control unit 10 in advance, this process is not necessary.

[0045] 1 prepares the gain coefficients Ga, Gb, Gc, and Gd of the load sensor units 25A, 25B, 25C, and 25D on the setting personal computer 27, for example, as a result of a previous experiment. Then, this data is transferred from the setting personal computer 27 to the electronic control device 10, and written and registered in a nonvolatile memory (for example, the main memory 12) on the electronic control device 10 (Sp1).

[0046] In addition, the administrator operates the setting computer 27 to set the initial reference weight A of each load sensor unit 25A to 25D as a correction value for so-called zero point drift, etc. of , B of , C of , and D of is written and registered in a non-volatile memory (for example, the main body memory 12) on the electronic control device 10 (Sp2).

[0047] [Start measuring loaded weight] Next, an example of the operation of the loaded weight measurement system when starting to measure the loaded weight will be described with reference to Figures 7 and 8. Note that, hereinafter, the processes of Sp11 to Sp24 will also be referred to as main processes.

[0048] When the ignition of the vehicle 41 is turned on or a power button (not shown) is operated to supply power to the load sensor unit 25, the control unit 11 detects the set initial reference weight A of ~D of Provisional load weight W calculated based on P0 is measured continuously (for example, at 0.5 second intervals) (Sp11).

[0049] More specifically, in Sp11, as shown in FIG. 9, the control unit 11 collects the load data A0, B0, C0, and D0 from each of the load sensor units 25A to 25D (Sp31). Then, the control unit 11 calculates the initial reference weight A of ~D of Based on the load data A0 to D0, the provisional load weight W P0 (Sp32, see equation (1) below). W P0 =(A0-A of )×Ga+(B0-B of )×Gb+(C0-C of )×Gc+(D0-D of )×Gd (1) Then, the control unit 11 calculates the provisional loaded weight average value W Pav Temporary average calculation data W P5 , W P4 , W P3 , W P2 , W P1 (Sp33, see equation (2) below) W P5 =W P4 , W P4 =W P3 , W P3 =W P2 , W P2 =W P1 , W P1 =W P0 ···(2) Then, the control unit 11 calculates the average value calculation data W P5 ~W P1 Provisional average load weight W Pav (Sp34, see equation (3) below) W Pav =(W P5 +W P4 +W P3 +W P2 +W P1 ) / 5···(3) Thereafter, the processing of the control unit 11 returns to the main processing.

[0050] The control unit 11 determines whether the parking brake of the vehicle 41 is ON (Sp12). That is, it determines whether the vehicle 41 has arrived at the site for loading and unloading the cargo and has stopped. If the parking brake is ON (Yes in Sp12), the processing of the control unit 11 proceeds to Sp13. On the other hand, if the parking brake is OFF (No in Sp12), the processing of the control unit 11 proceeds to Sp11.

[0051] When the parking brake is ON (Yes in Sp12), the control unit 11 calculates the provisional load weight W P0 and provisional average load weight W Pav Then, a process is executed to determine whether the state of the vehicle 41 has stabilized based on the amount of change in the vehicle speed (Sp13).

[0052] More specifically, in Sp13, as shown in FIG. 10, the provisional load weight W P0 and provisional average load weight W Pav It is determined whether the amount of change in is smaller than a predetermined threshold (20 in this example) (Sp41, see equation (4) below). |W Pav -W P0 |<20···(4) Provisional loading weight W P0 and provisional average load weight W Pav If the change amount is smaller than the predetermined threshold (Yes in Sp41), the control unit 11 sets the vehicle stability determination flag S f The count is incremented by one (Sp42). After that, the processing of the control unit 11 returns to the main processing. Meanwhile, provisional load weight W P0 and provisional average load weight W Pav If the amount of change is greater than the predetermined threshold (No in Sp41), the processing of the control unit 11 returns to the main processing.

[0053] The control unit 11 sets the vehicle stability determination flag S f is equal to or greater than a predetermined threshold value (10 in this example) (Sp14). Here, it is determined whether a certain amount of time has passed since the vehicle 41 became stable, that is, whether the vehicle 41 is completely stable. f If the vehicle stability determination flag S is equal to or greater than the predetermined threshold (Yes in Sp14), the process of the control unit 11 proceeds to Sp15. f If is less than the predetermined threshold value (No in Sp14), the process of the control unit 11 proceeds to Sp11.

[0054] The control unit 11 sets the vehicle stability determination flag S f If the value is equal to or greater than the predetermined threshold (Yes in Sp14), automatic measurement of the load weight starts (load data reference point A st , B st , C st , and D st (Sp15). Here, the automatic measurement of the load weight is started when the vehicle 41 is determined to be stable, regardless of whether the driver presses the start button 28. After the processing of Sp23 described later, the automatic measurement of the load weight is started again when the driver has dismounted, in order to ensure high measurement accuracy.

[0055] More specifically, in Sp15, as shown in FIG. 11, the control unit 11 collects the load data A0 to D0 from the load sensor units 25A to 25D (Sp51). Then, the control unit 11 calculates the load data reference points A for weight calculation in the load sensor units 25A to 25D based on the load data A0 to D0. st ~D st Set (Sp52, see equation (5) below). A st =A0, B st =B0, Cst =C0, D st =D0 (5) Thereafter, the processing of the control unit 11 returns to the main processing.

[0056] The control unit 11 determines whether or not it has detected the crew member pressing the start button 28 (Sp16). Here, it determines whether or not to continue automatic measurement. If it has detected the start button 28 being pressed (Yes in Sp16), the processing of the control unit 11 proceeds to Sp17. On the other hand, if it has not detected the start button 28 being pressed (No in Sp16), the processing of the control unit 11 proceeds to Sp20.

[0057] When the control unit 11 detects that the start button 28 has been pressed (Yes in Sp16), it stops the automatic measurement (Sp17). In other words, when the start button 28 is pressed by the crew member, the normal measurement of the loaded weight is started, so there is no need to perform the automatic measurement.

[0058] The control unit 11 starts automatic measurement of the load weight (load data reference point A st , B st , C st , and D st (Sp18). Generally, the driver presses the start button 28 after getting off the vehicle 41 so that the driver's own weight and the vehicle shaking caused by getting off do not affect the measurement of the load weight. That is, in this case, it is assumed that the start button 28 is pressed after the above-mentioned vehicle shaking etc. has settled down, and the load data reference point A is set again in order to guarantee high measurement accuracy. st ~D st is reset.

[0059] The control unit 11 executes a weight calculation process relating to the loading and unloading of the load onto the vehicle 41, that is, measures the load weight (Sp19).

[0060] More specifically, in Sp19, as shown in FIG. 12, the control unit 11 collects the load data A0 to D0 from the load sensor units 25A to 25D (Sp61). Then, the control unit 11 calculates the initial reference weight A of~D of Based on the load data A0 to D0, the loaded weight W0 is calculated (Sp62, see the following formula (6)). W0=(A0-A of )×Ga+(B0-B of )×Gb+(C0-C of )×Gc+(D0-D of )×Gd···(6) Then, the control unit 11 calculates the average load weight W av Temporary average calculation data W5, W4, W3, W2, and W1 are created to calculate the average value (Sp63, see formula (7) below). W5=W4, W4=W3, W3=W2, W2=W1, W1=W0...(7) Then, the control unit 11 calculates the loaded weight average value W from the average value calculation data W5 to W1. av (Sp64, see equation (8) below) W av =(W5+W4+W3+W2+W1) / 5 (8) Thereafter, the processing of the control unit 11 returns to the main processing, and the main processing flow ends.

[0061] When the control unit 11 does not detect the pressing of the start button 28 (No in Sp16), it executes the dismounting determination process to determine whether the driver has dismounted (Sp20). av The aim is to detect when the driver dismounts from the vehicle 41 based on the change in the current load weight W0, and to stabilize the vehicle 41 after the driver dismounts.

[0062] More specifically, in Sp20, as shown in FIG. 13, the control unit 11 determines whether the first disembarking flag Kf1 is ON or not (Sp71). When the first disembarking flag Kf1 is OFF (No in Sp71), the control unit 11 calculates the average load weight W av It is also determined whether the amount of change in the current loaded weight W0 is equal to or greater than a predetermined threshold value (20 in this example) (Sp72). Load weight average value W avIf the change in the current load weight W0 is equal to or greater than the predetermined threshold (Yes in Sp72), the control unit 11 determines that the driver has disembarked from the vehicle 41 and turns on the first disembarking flag Kf1 (Sp73). After that, the processing of the control unit 11 returns to the main processing. On the other hand, the average load weight W av If the amount of change in the current loaded weight W0 is less than the predetermined threshold (No in Sp72), the processing of the control unit 11 returns to the main processing. When the first disembarking flag Kf1 is ON (Yes in Sp71), the control unit 11 calculates the average load weight W av It is also determined whether the amount of change in the current loaded weight W0 is less than a predetermined threshold value (20 in this example) (Sp74). Load weight average value W av If the amount of change in the current load weight W0 is less than the predetermined threshold (Yes in Sp74), the control unit 11 counts up the second disembarking flag Kf2 by 1 (Sp75). After that, the processing of the control unit 11 returns to the main processing. On the other hand, the average load weight W av If the amount of change in the current loaded weight W0 is equal to or greater than the predetermined threshold (No in Sp74), the processing of the control unit 11 returns to the main processing.

[0063] The control unit 11 determines whether the second disembarking flag Kf2 is equal to or greater than a predetermined threshold (10 in this example) (Sp21). Here, it determines whether a certain amount of time has passed since the crew disembarked from the vehicle 41, that is, whether the vehicle 41 is completely stable. If the second disembarking flag Kf2 is equal to or greater than the predetermined threshold (Yes in Sp21), the control unit 11 proceeds to Sp22. On the other hand, if the second disembarking flag Kf2 is less than the predetermined threshold (No in Sp21), the control unit 11 proceeds to Sp24.

[0064] If the second disembarking flag Kf2 is equal to or greater than the predetermined threshold (Yes in Sp21), the control unit 11 resets the two disembarking flags (Kf1 is turned OFF, Kf2=0) (Sp22). By resetting the two disembarking flags, the aim is to make it possible to determine whether or not a passenger has disembarked even when multiple crew members disembark in sequence.

[0065] The control unit 11 determines that the vehicle 41 has stabilized after the driver dismounts from the vehicle 41, and stops the automatic measurement (Sp23). After that, the processing of the control unit 11 proceeds to Sp15. That is, to prevent the weight of the driver or the shaking of the vehicle 41 caused by dismounting from the vehicle from affecting the measurement of the load weight, the automatic measurement is stopped in Sp23, and the automatic measurement is restarted in Sp15.

[0066] If the second disembarkation flag Kf2 is less than the predetermined threshold (No in Sp21), the control unit 11 executes the loaded weight calculation process, i.e., measures the loaded weight (Sp24). After that, the process of the control unit 11 proceeds to Sp16. That is, unless the start button is pressed by the crew, the control unit 11 repeats the processes of Sp16 and Sp20 to Sp24. In other words, unless the start button is pressed by the crew, automatic measurement of the loaded weight is reliably performed. The loaded weight calculation process in Sp24 is the same as in Sp20.

[0067] [Load weight measurement completed] Next, an example of the operation of the loaded weight measurement system for completing measurement of the loaded weight will be described with reference to Fig. 14. Note that, hereinafter, the processes of Sp81 to Sp89 will also be referred to as main processes.

[0068] It is assumed that the control unit 11 performs the loaded weight calculation process after starting to measure the loaded weight (Sp81). The loaded weight calculation process in Sp81 is the same as in Sp20.

[0069] The control unit 11 determines whether or not it has detected the crew member pressing the end button 29 (Sp82). Here, it determines whether or not to forcibly terminate the measurement of the load weight. If it has detected the end button 29 being pressed (Yes in Sp82), the processing of the control unit 11 proceeds to Sp83. On the other hand, if it has not detected the end button 29 being pressed (No in Sp82), the processing of the control unit 11 proceeds to Sp84.

[0070] When the control unit 11 detects that the end button 29 has been pressed (Yes in Sp82), it causes the display unit 14 to fix the display of the load weight of the cargo loaded on the vehicle 41 (Sp83). Then, this main processing flow is ended. In other words, the measurement of the load weight is ended as usual.

[0071] When the control unit 11 does not detect the pressing of the end button 29 (No in Sp82), it averages the load data A0 to D0 of each load sensor unit 25A to 25D (Sp84). av , B av , C av , and D av Calculate.

[0072] More specifically, in step S84, as shown in FIG. 15, the control unit 11 calculates the average load data A of the load sensor unit 25A. av Temporary average calculation data is created to calculate (Sp91, see equation (9) below). A n =A n-1 , , A2 = A1, A1 = A0 (n ​​is an integer) (9) Similarly, the control unit 11 receives the average load data B of the load sensor unit 25B. av Temporary average calculation data is created to calculate (Sp92, see equation (10) below). B n =B n-1 , ···, B2=B1, B1=B0 (n is an integer) ··· (10) Similarly, the control unit 11 receives the average load data C of the load sensor unit 25C. av Temporary average calculation data is created to calculate (Sp93, see equation (11) below). C n =C n-1 , ···, C2=C1, C1=C0 (n is an integer) ··· (11) Similarly, the control unit 11 calculates the average load data D of the load sensor unit 25D. av Temporary average calculation data is created to calculate (Sp94, see equation (12) below). D n =D n-1 , ···, D2=D1, D1=D0 (n is an integer) ··· (12) Then, the control unit 11 calculates the average load data A av (Sp95, see equation (13) below). A av =(A n +A n-1 +···+A2+A1) / n (n is an integer)···(13) Similarly, the control unit 11 calculates the average load data B av (Sp96, see equation (14) below). B av =(B n +B n-1 + +B2+B1) / n (n is an integer) (14) Similarly, the control unit 11 calculates the average load data C av (Sp97, see equation (15) below). C av =(C n +C n-1 + +C2+C1) / n (n is an integer) (15) Similarly, the control unit 11 calculates the average load data D av (Sp98, see equation (16) below). D av =(D n +D n-1 + +D2+D1) / n (n is an integer) (16)

[0073] The control unit 11 executes a boarding determination process to determine whether a driver has boarded the vehicle (Sp85). Here, in order to determine whether a driver has boarded the vehicle, the aim is to detect whether there is a large change only in the front wheels.

[0074] More specifically, in step S85, as shown in FIG. 16, the control unit 11 compares the current load data A0 and the average load data A1 in the load sensor unit 25A. av It is determined whether the difference between the values ​​is greater than a predetermined threshold (5 in this example) (Sp101, see equation (17) below). A0-A av >5···(17) Current load data A0 and average load data A av If the difference between the current load data B0 and the average load data B1 is greater than the predetermined threshold (Yes in Sp101), the control unit 11 calculates the difference between the current load data B0 and the average load data B1 in the load sensor unit 25B. av It is determined whether the difference between the values ​​is greater than a predetermined threshold (5 in this example) (Sp102, see equation (18) below). B0-B av >5···(18) On the other hand, the current load data A0 and the average load data A av If the difference is smaller than the predetermined threshold (No in Sp101), the processing of the control unit 11 returns to the main processing. Current load data B0 and average load data B av If the difference between the current load data C0 and the average load data C1 is greater than the predetermined threshold (Yes in Sp102), the control unit 11 calculates the difference between the current load data C0 and the average load data C1 in the load sensor unit 25C. av It is determined whether the amount of change between the values ​​is smaller than a predetermined threshold (5 in this example) (Sp103, see equation (19) below). |C0-C av |<5···(19) On the other hand, the current load data B0 and the average load data B av If the amount of change between the values ​​is smaller than the predetermined threshold (No in Sp102), the processing of the control unit 11 returns to the main processing. Current load data C0 and average load data C av If the change amount between the current load data D0 and the average load data D1 is smaller than the predetermined threshold (Yes in Sp103), the control unit 11 calculates the current load data D0 and the average load data D1 in the load sensor unit 25D. av It is determined whether the amount of change between the values ​​is smaller than a predetermined threshold (Sp104, see equation (20) below). |D0-D av |<5···(20) On the other hand, the current load data C0 and the average load data C av If the amount of change between the values ​​is greater than the predetermined threshold (No in Sp103), the processing of the control unit 11 returns to the main processing. Current load data D0 and average load data D av If the amount of change between the vehicle speed and the vehicle load is smaller than the predetermined threshold (Yes in Sp104), the control unit 11 turns on the boarding flag (Sp105). After that, the processing of the control unit 11 returns to the main processing. On the other hand, the current load data D0 and the average load data D av If the amount of change between the values ​​is greater than the predetermined threshold (No in Sp104), the processing of the control unit 11 returns to the main processing.

[0075] The control unit 11 determines whether or not a crew member has boarded the vehicle 41 based on the result of Sp85 (Sp86). That is, it determines whether or not the boarding flag is ON. If a crew member has boarded the vehicle 41 (Yes in Sp86), the processing of the control unit 11 proceeds to Sp87. On the other hand, if a crew member has not boarded the vehicle 41 (No in Sp86), the processing of the control unit 11 proceeds to Sp89.

[0076] When a crew member gets into the vehicle 41 (Yes in Sp86), the control unit 11 determines whether the parking brake of the vehicle 41 is OFF (Sp87). That is, it determines whether the vehicle 41 is departing from the site related to loading and unloading of cargo. If the parking brake is OFF (Yes in Sp87), the processing of the control unit 11 proceeds to Sp88. On the other hand, if the parking brake is ON (No in Sp87), the processing of the control unit 11 proceeds to Sp81.

[0077] If the parking brake is OFF (Yes in Sp87), the control unit 11 fixes the load weight measured before the driver got on and stored in the main memory 12 on the display unit 14 (Sp88). Then, this main processing flow ends. In other words, if the driver has gotten on and the parking brake is OFF, it is determined that the driver forgot to press the end button 29, and the measurement of the load weight is forcibly ended.

[0078] If the driver is not on board the vehicle 41 (No in Sp86), the control unit 11 overwrites and saves the most recently measured load weight in the main body memory 12 (Sp89). After that, the processing of the control unit 11 proceeds to Sp81.

[0079] <Actions and Effects> As described above, according to this embodiment, automatic measurement of the load weight is started at a predetermined timing after the vehicle 41 stops, so that the load weight of the vehicle 41 can be measured regardless of whether the crew member presses the start button 28. Furthermore, if the start button 28 is pressed after the start of automatic measurement, the automatic measurement is stopped, the reference point for the load data of each load sensor unit 25 is reset, and manual measurement is started, thereby enabling the loaded weight of the vehicle 41 to be measured with high accuracy in manual measurement. Furthermore, if the start button 28 is not pressed, i.e., forgotten to be pressed, it is determined whether or not the crew has disembarked from the vehicle 41, and if it is determined that the crew has disembarked from the vehicle 41, the automatic measurement is stopped, the reference point for the load data of each load sensor unit 25 is reset, and a new automatic measurement is started, thereby enabling the loaded weight of the vehicle 41 to be measured with high accuracy in the automatic measurement. As described above, according to this embodiment, the loaded weight of the vehicle 41 can be measured with high accuracy in both manual and automatic measurements.

[0080] Furthermore, according to this embodiment, when the end button 29 is pressed, the measurement of the load weight is terminated, so that the measurement of the load weight can be terminated at an appropriate timing, and the load weight of the vehicle 41 can be measured with high accuracy. Furthermore, if the end button 29 is not pressed, it is possible to forcibly terminate the measurement of the load weight depending on the determination result (for example, if the end button 29 is forgotten to be pressed) by determining whether or not a crew member has boarded the vehicle 41.

[0081] Furthermore, according to this embodiment, when a crew member gets into vehicle 41, it is determined whether the parking brake of vehicle 41 is on or off, and if the parking brake is off, the measurement of the load weight is terminated, thereby forcibly terminating the measurement of the vehicle's load weight if the end button 29 is forgotten to be pressed.

[0082] Furthermore, according to this embodiment, the specified timing is the timing when it is determined that the vehicle 41 has stabilized after stopping the vehicle 41, so that automatic measurement of the load weight can be started at an appropriate timing, thereby improving the accuracy of the manual or automatic measurement that is performed later.

[0083] <Additional Notes> Here, the features of the embodiments of the loaded weight measurement system and the loaded weight measurement method according to the present invention will be briefly summarized and listed below in [1] to [6].

[0084] [1] A load weight measurement system for measuring a load weight of a vehicle (e.g., 41), a sensor unit (e.g., 25) attached to an axle (e.g., 43A, 43B) of the vehicle and outputting a signal of strain detected on the axle; an on-board device (e.g., 10, 11) that measures the load weight based on a signal (e.g., load data) output from the sensor unit; an input unit (e.g., 28, 29, 30) connected to the on-board device and configured to accept an input operation related to the measurement of the load weight; The vehicle-mounted device The device has a function of manual measurement, which starts measuring the load weight when a measurement start operation for starting measurement of the load weight is performed on the input unit, and an automatic measurement, which starts measuring the load weight at a predetermined timing after the vehicle has stopped, determining whether or not the measurement start operation has been performed on the input unit after the start of the automatic measurement; When the measurement start operation is performed on the input unit, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the manual measurement is started; If the measurement start operation has not been performed on the input unit, it is determined whether or not the crew has disembarked from the vehicle, and if it is determined that the crew has disembarked from the vehicle, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the automatic measurement is started anew. Load weight measurement system.

[0085] [2] The load weight measurement system according to [1] above, The vehicle-mounted device determining whether a measurement end operation for ending the measurement of the loaded weight has been performed on the input unit; When the measurement end operation is performed on the input unit, the measurement of the loaded weight is ended, If the measurement termination operation has not been performed on the input unit, it is determined whether the driver has boarded the vehicle. Load weight measurement system.

[0086] [3] The load weight measurement system according to [2] above, The vehicle-mounted device When the driver gets on the vehicle, it is determined whether the parking brake of the vehicle is on or off, and if the parking brake is off, the measurement of the load weight is terminated. Load weight measurement system.

[0087] [4] The load weight measurement system according to any one of [1] to [3] above, the predetermined timing is a timing at which the vehicle is determined by the in-vehicle device to have stabilized after the vehicle has stopped; Load weight measurement system.

[0088] [5] A method for measuring a load weight of a vehicle (e.g., 41) based on a signal (e.g., load data) output from a sensor unit (e.g., 25) attached to an axle (e.g., 43A, 43B) of the vehicle and outputting a signal of strain detected on the axle, comprising: starting automatic measurement of the load weight at a predetermined timing after the vehicle has stopped; After the start of the automatic measurement, it is determined whether or not a measurement start operation has been performed on an input unit (e.g., 28, 29, 30) that accepts input operations related to the measurement of the loaded weight, including a measurement start operation for starting manual measurement of the loaded weight; When the measurement start operation is performed on the input unit, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the manual measurement is started; If the measurement start operation has not been performed on the input unit, it is determined whether or not the crew has disembarked from the vehicle, and if it is determined that the crew has disembarked from the vehicle, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the automatic measurement is started anew. Load weight measurement method.

[0089] [6] The load weight measurement method according to [5] above, determining whether a measurement end operation for ending the measurement of the loaded weight has been performed on the input unit; When the measurement end operation is performed on the input unit, the measurement of the loaded weight is ended, If the measurement termination operation has not been performed on the input unit, it is determined whether the driver has boarded the vehicle. Load weight measurement method.

[0090] According to the configurations [1] and [5] above, by starting automatic measurement of the load weight at a predetermined timing after the vehicle stops, the load weight of the vehicle can be measured regardless of the driver's operation to start measurement on the input unit. Furthermore, if a measurement start operation is performed on the input unit after automatic measurement has started, the automatic measurement is stopped, the reference point for the signal output from the sensor unit is reset, and manual measurement is started, thereby enabling the vehicle's load weight to be measured with high accuracy in manual measurement. In addition, if no measurement start operation is performed on the input unit, it is determined whether the crew has disembarked from the vehicle, and if it is determined that the crew has disembarked from the vehicle, the automatic measurement is stopped, the reference point for the signal output from the sensor unit is reset, and a new automatic measurement is started, thereby enabling the vehicle's load weight to be measured with high accuracy during automatic measurement. In this way, with this configuration, the vehicle load weight can be measured with high accuracy in both manual and automatic measurements.

[0091] According to the configurations [2] and [6] above, when a measurement termination operation is performed on the input unit, the measurement of the load weight is terminated, so that the measurement of the load weight can be terminated at an appropriate timing, and the load weight of the vehicle can be measured with high accuracy. Furthermore, if no operation to terminate measurement has been performed on the input unit, it is possible to forcibly terminate measurement of the load weight depending on the determination result by determining whether or not a crew member has boarded the vehicle.

[0092] According to the configuration [3] above, when a crew member gets into a vehicle, it is determined whether the vehicle's parking brake is on or off, and if the parking brake is off, the measurement of the load weight is terminated, so that if the crew member forgets to perform the measurement termination operation on the input unit, the measurement of the vehicle's load weight can be forcibly terminated.

[0093] According to the configuration [4] above, the predetermined timing is the timing when the on-board device determines that the vehicle has stabilized after stopping, so that automatic measurement of the load weight can be started at an appropriate timing, thereby improving the accuracy of subsequent manual or automatic measurement. [Explanation of symbols]

[0094] 10 Electronic control device 11 Control section 12 Main memory 14 Display section 25, 25A, 25B, 25C, 25D Load Sensor Unit 28 Start button 29 Exit button 41 vehicles A0, B0, C0, D0 load data A av ,B av ,C av ,D av Average Load Data A Оf ,B Оf ,C Оf ,D Оf Initial reference weight A st ,B st ,C st ,D st Load Data Reference Point Ga, Gb, Gc, Gd Gain coefficients Kf1 First Disembarkation Flag Kf2 Disembarkation 2nd Flag S f Vehicle stability judgment flag W P0 Provisional loading weight W Pav Provisional average load weight W0 Load Weight W av Average load weight

Claims

1. A load weight measurement system for measuring a load weight of a vehicle, a sensor unit attached to an axle of the vehicle and outputting a signal representing strain detected on the axle; an on-board device that measures the load weight based on a signal output from the sensor unit; an input unit connected to the on-board device and configured to accept an input operation related to the measurement of the load weight, The vehicle-mounted device The device has a function of manual measurement, which starts measuring the load weight when a measurement start operation for starting measurement of the load weight is performed on the input unit, and an automatic measurement, which starts measuring the load weight at a predetermined timing after the vehicle has stopped, determining whether or not the measurement start operation has been performed on the input unit after the start of the automatic measurement; When the measurement start operation is performed on the input unit, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the manual measurement is started; If the measurement start operation has not been performed on the input unit, it is determined whether or not the crew has disembarked from the vehicle, and if it is determined that the crew has disembarked from the vehicle, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the automatic measurement is started anew. Load weight measurement system.

2. The load weight measurement system according to claim 1, The vehicle-mounted device determining whether a measurement end operation for ending the measurement of the loaded weight has been performed on the input unit; When the measurement end operation is performed on the input unit, the measurement of the loaded weight is ended, If the measurement termination operation has not been performed on the input unit, it is determined whether the driver has boarded the vehicle. Load weight measurement system.

3. 3. The load weight measurement system according to claim 2, The vehicle-mounted device When the driver gets on the vehicle, it is determined whether the parking brake of the vehicle is on or off, and if the parking brake is off, the measurement of the load weight is terminated. Load weight measurement system.

4. The load weight measurement system according to claim 1, the predetermined timing is a timing at which the vehicle is determined by the in-vehicle device to have stabilized after the vehicle has stopped; Load weight measurement system.

5. 1. A method for measuring a load weight of a vehicle based on a signal output from a sensor unit attached to an axle of the vehicle and outputting a signal of strain detected on the axle, comprising: starting automatic measurement of the load weight at a predetermined timing after the vehicle has stopped; After the start of the automatic measurement, it is determined whether or not a measurement start operation has been performed on an input unit that accepts input operations related to the measurement of the loaded weight, including a measurement start operation for starting manual measurement of the loaded weight; When the measurement start operation is performed on the input unit, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the manual measurement is started; If the measurement start operation has not been performed on the input unit, it is determined whether or not the crew has disembarked from the vehicle, and if it is determined that the crew has disembarked from the vehicle, the automatic measurement is stopped, a reference point for the signal output from the sensor unit is reset, and the automatic measurement is started anew. Load weight measurement method.

6. 6. The method for measuring a load weight according to claim 5, determining whether a measurement end operation for ending the measurement of the loaded weight has been performed on the input unit; When the measurement end operation is performed on the input unit, the measurement of the loaded weight is ended, If the measurement termination operation has not been performed on the input unit, it is determined whether the driver has boarded the vehicle. Load weight measurement method.

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