JP4834296B2 - Self weighing system - Google Patents

Description

  The present invention relates to a self-weighing system, and more particularly to a self-weighing system for measuring a load capacity of a transport vehicle such as a tank truck.

2. Description of the Related Art Conventionally, in a transport vehicle such as a tank lorry vehicle, a self-weight meter for measuring the load load is attached to the cabin of the vehicle or disclosed in Japanese Utility Model Publication No. 7-38826 (Patent Document 1). Installed outside the vehicle.
No. 7-38826

  However, in the installation of the self-weight meter as described above, when instructing the start / stop of the load measurement when operating the vehicle, if it is installed in the cabin, the place where the load is unloaded (for example, the tank) And the cargo space), it is necessary to move back and forth between the loading / unloading place and the cabin, so that operability becomes a problem, and when it is installed outside the vehicle There was a problem with the display confirmation, data collection and operation.

  In view of the above-described conventional problems, an object of the present invention is to provide a self-weighing system having good operability and excellent handling.

According to the first aspect of the present invention, there is provided a sensor for measuring a change in the weight of a vehicle load, a power switch, a calculation means for calculating a change in the weight of the load based on the output of the sensor, and starting a measurement of the change in the weight of the load. A first start instructing means for instructing and a first end instructing means for instructing the end of the load weight change amount measurement, and a self-weighing scale installed in the cabin including the cab of the vehicle. In the self-weighing system, the sensor is connected to the first start instructing unit and the first end instructing unit to control the operation of the entire system and to serve as the calculating unit. A microcomputer including an I / O port for connecting to an external device, wherein the I / O port includes a second start instruction means for instructing start of load weight change measurement; A second termination instruction means for instructing termination of the preliminary cargo weight variation measured, located outside of the cabin of the vehicle as an external device, the second start command means and the second end instruction When an external controller for operating the means is connected and the start of measurement is instructed by the first start instructing means, during the measurement operation, the second start instructing means and the second end instructing means When the measurement start is instructed by the second start instruction means, the instructions from the first start instruction means and the first end instruction means are invalidated during the measurement operation. characterized in that that.

According to the second aspect of the present invention, there is provided a sensor for measuring a change in weight of a vehicle load, a power switch, a calculation means for calculating a change in the weight of the load based on an output of the sensor, and a start of measurement of the change in the load weight. A first start instructing means for instructing and a first end instructing means for instructing the end of the load weight change amount measurement, and a self-weighing scale installed in the cabin including the cab of the vehicle. A self-weighing system that is connected to the self-weighing scale, and that is a second start instruction means for instructing the self-weight to start the load weight change amount measurement; and a second start instruction means that instructs the end of the load weight change amount measurement. And an external operation device for operating the second start instruction means and the second end instruction means installed outside the cabin of the vehicle as an external device, Measurement start by means of starting Is instructed during the measurement operation, the instructions from the second start instructing means and the second end instructing means are invalidated, and the measurement start is instructed by the second start instructing means. In the measurement operation, the instructions from the first start instruction means and the first end instruction means are invalidated.

The invention described in claim 3 is the self-weighing system according to claim 1 or 2 ,
The external controller further includes a re-measurement instruction means for instructing re-measurement after a measurement end instruction, and the self-weight is instructed to re-measure when the re-measurement instruction means or the ignition key is operated , When the re-measurement instruction means is not operated after the end instruction and the ignition key is operated, re-measurement is instructed.

  According to the invention described in claim 1, since the start and end of the measurement can be instructed by an external operation device that can be arranged in the vicinity of the work place such as unloading away from the dead weight, the operability is good and handling Can provide an excellent self-weighing system.

Further, it is possible to prevent an erroneous operation when instructing the start and end of the load weight change amount measurement. For example, in the measurement of the change in load weight, when an operator starts a measurement with a dead weight while the operator is in the driver's seat, and when the operator gives an instruction to end the measurement when the operator is not on the vehicle (that is, external operation In the case where the measurement end is instructed on the container side), it is possible to prevent an erroneous operation of adding the operator's body weight to the measurement value in addition to the change amount of the loaded weight.

According to the invention described in claim 2, since the start and end of the measurement can be instructed by an external operation device that can be arranged in the vicinity of the work place such as unloading away from the dead weight, the operability is good and handling Can provide an excellent self-weighing system. Further, it is possible to prevent an erroneous operation when instructing the start and end of the load weight change amount measurement.

According to the third aspect of the present invention, the resumption of measurement can be instructed by the external operation device that can be arranged away from the dead weight and in the vicinity of the work place such as unloading, and the operability is good.

  Hereinafter, the self-weighing system of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a self-weighing system according to the best mode of the present invention.

  The self-weighing system 10 is mounted on the vehicle 1. The vehicle 1 is a transport vehicle that transports a load, for example, a gas lorry vehicle that transports liquefied gas. The vehicle 1 includes front and rear wheels 1a, a tank 1b filled with liquefied gas, and a cabin 1c including a driver's seat. ing. The tank 1b is filled with liquefied gas such as liquefied nitrogen gas, for example.

  The self-weighing system 10 includes a load weight change amount measuring sensor 11 for detecting a change amount of the load weight applied to each wheel 1a, and a self weight that is installed inside the cabin 1c and the sensor 11 is connected by a harness or the like. A total 12 and an external operating device 13 installed outside the cabin 1 and connected to the dead weight 12 with a harness or the like are provided.

  The sensor 11 is composed of a load sensor such as a strain gauge type sensor as disclosed in, for example, Japanese Patent Application Laid-Open No. 11-132837, and is mounted on the axle of each wheel. Each sensor 11 generates a weight signal having a frequency that changes in accordance with the amount of change in the weight of the load applied to the axle. The self-weight meter 12 can measure the amount of change in the weight of the load applied to the front, rear, left and right wheels 1a based on the weight signal generated from each sensor 11.

  FIG. 2 is a block diagram illustrating a configuration example of the self-weight meter 12. The self-weight meter 12 controls a whole system and also serves as a calculation means, a microcomputer 120 (hereinafter referred to as a microcomputer), an EEPROM 121 as a non-volatile memory, a display 122 including an LCD (liquid crystal display), and a printing means. Printer 123, an operation unit 124, and a card writer 125.

  The microcomputer 120 includes a CPU 120a that controls the entire system and serves as calculation means, and a ROM 120b and a RAM 120c. The CPU 120a is connected to the ROM 120b and the RAM 120c, and further to each sensor 11, the EEPROM 121, the display 122, the printer 123, the operation unit 124, and the card writer. Further, the ignition key switch signal of the vehicle is also input to the CPU 120a.

  Further, the CPU 120a is provided with I / O ports P1 and P2 for connecting external devices. An external controller 13 is connected to the I / O port P1, and a digital tachograph 17 is connected to the I / O port P2.

  The ROM 120b stores a control program for causing the CPU 120a to perform various processing operations. The RAM 120c has a data area for storing various data and a work area used for various processing operations.

  The EEPROM 121 includes tables such as offset adjustment values and characteristic correction values for the weight signal output from each sensor 11, a frequency-load (weight) conversion formula, a gas type and a volume conversion value table per unit weight, and the like. Are stored in advance. The EEPROM 121 is provided with a memory area for printing data.

  The offset adjustment value is for eliminating variation in the frequency of the weight signal output by each sensor 11 when the load weight change amount is “0”, and the characteristic correction value is the value in the tank 1b. This is for correcting the variation between the sensors 11 in the characteristics relating to the correlation between the load applied to the sensor 11 from the load and the weight signal output from the sensor 11 in accordance therewith. 11 is set.

  The operation unit 124 includes a start switch 124a as a first start instruction unit for instructing the start of the load weight change amount measurement, and a first end instruction unit for instructing the end of the load weight change amount measurement. As an end switch 124b. The start switch 124a is operated by pressing a start button (not shown) which is a push button provided on the front panel of the casing constituting the self-weight 12, and the end switch 124b is similarly a push button provided on the front panel. It is operated by pressing an end button (not shown) which is a button.

  The card writer 125 can write the data supplied from the CPU 120a to the memory card 16 that is a portable storage medium. The digital tachograph 17 can write the data supplied from the CPU 120 a together with operation information such as the traveling speed of the vehicle 1 in a memory card 18 that is a portable storage medium.

  As shown in FIG. 3, the external operation device 13 includes an operation device main body 130 that is a housing, and a connector 132 that is connected to the operation device main body 130 with a cable 131. The operation device main body 130 includes a display unit 133 and an operation unit 134 made of an LCD or the like on the front panel of the housing. The operation unit 134 includes a start button 134a serving as a second start instruction unit that is a push button for operating a switch corresponding to the start switch 124a of the self-weigh scale 12 (which is built in the operation unit main body 130 but not shown). An end button 134b as a second end instruction means that is a push button for operating a switch (not shown) corresponding to the end switch 124b, and a remeasurement switch (incorporated in the operation unit main body 130) for instructing remeasurement. Includes a re-measurement button 134c as a re-measurement instruction means which is a push button for operating (not shown).

  The external controller 13 is connected to the I / O port P1 of the CPU 120a in the self-weight 12 via the connector 132, and the controller main body 130 is operability outside the cabin 1c of the vehicle 1 and away from the self-weight 12. In a good location, that is, in the vicinity of a work place such as unloading of liquefied gas (for example, in the vicinity of a filling hose (not shown) of the tank 1b).

  Next, processing performed by the CPU 120a according to the control program stored in the ROM 120b will be described with reference to the flowcharts shown in FIGS.

  First, it is determined whether or not a power button (not shown) is pressed in the self-weighing system 12 of the self-weighing system 10 (step S1). If the answer is yes, then the power of the self-weighing system 10 is turned on (step S1). Step S3).

  Next, after the initial operation by turning on the system power supply, the memory area of the printing data stored in the EEPROM 121 at the time of the previous measurement is cleared (step S5), and then the load weight change amount zero kilogram (0 kg) is displayed on the display 122. ) Is displayed (step S7). Next, it is determined whether or not a load weight change amount measurement start button (not shown) has been pressed (step S9). If the answer is yes, the process proceeds to step S17, and if no, the process proceeds to step S11.

  In step S11, it is determined whether or not the power button has been pressed. If the answer is no, the process proceeds to step S13, and if yes, the process proceeds to step S57. In step S13, it is determined whether or not an issue button (not shown) has been pressed. If the answer is no, the process returns to step S9, and if yes, the process proceeds to step S15 to cause the printer 123 to print the weighing slip.

  Steps S11 to S13 represent a loop for starting measurement when the start button is not pressed, and the measurement process can be terminated by pressing the power button during the wait.

  On the other hand, if the start button is pressed in step S9, the process proceeds to step S17, and the current frequency of the weight signal supplied from each sensor 11 is offset adjusted with the offset adjustment value stored in the EEPROM 121 to obtain the offset frequency. .

  Next, the offset frequency after offset adjustment is recorded in the memory card 15 via the card writer 125 (step S19), and then the offset frequency data is transmitted to the digital tachograph 17 (step S21). The digital tachograph 17 receives the offset frequency data and writes the received offset frequency data to the memory card 18.

  Next, based on the input of the ignition key switch signal, it is determined whether or not the ignition key switch has been turned on (step S23). If the answer is no, the vehicle 1 is in a stopped state, so step S25 is performed. If YES, the vehicle 1 is regarded as not being stopped, and the process proceeds to step S37.

  In step S25, loading, that is, loading of liquefied gas into the tank 1b or unloading from the tank 1b is performed. Next, based on the frequency of the weight signal output from the sensor 11 and the frequency-load (weight) conversion formula stored in the EEPROM 121, a calculation for converting the frequency into a load (weight) is performed (step S27). Next, the obtained load (weight) is displayed on the display 122 (step S29). In other words, although “0 kg” is displayed on the display 122 in step S7, the load weight change value calculated in step S27 is displayed in kg. As the calculated load weight change value, the value at the start of measurement is displayed first, and then the value that changes with the progress of loading or unloading is updated and displayed. The obtained load (weight) is stored in the memory area of the print data in the EEPROM 121.

  Next, it is determined whether the start button pressed in step S9 is the start button provided in the self-weight 12 or the start button 134a provided in the external controller 13 (step S31). If there is, the process proceeds to step S33, and if it is the latter, the process proceeds to step S35.

  If the start button pressed in step S9 is a start button provided in the self-weighing scale 12, it is determined in step S33 whether or not an end button (not shown) of the self-weighing scale 12 has been pressed (that is, end). If the answer is no, the process proceeds to step S37, and if the answer is yes, the process proceeds to step S39.

  On the other hand, in step S35, it is determined whether or not the end button 134b of the external controller 13 has been pressed. If the answer is no, the process proceeds to step S37, and if yes, the process proceeds to step S39.

  When the start of measurement is instructed on the start switch 124a side of the self-weigh scale 12 in the above steps S31, S33 and S35, the instructions from the start button 134a and end button 134b side of the external controller 13 are invalid during the measurement operation. If the start of measurement is instructed on the start button 134a side of the external controller 13, the instructions from the start switch 124a and end switch 124b side of the self-weigh scale 12 are invalidated during the measurement operation.

  Therefore, for example, after the measurement operator enters the cabin 1c and instructs the start of measurement on the start switch side of the dead weight 12, the measurement operator instructs the end of the measurement on the end button 134b side of the external controller 13, or the measurement operator Even if the start of the measurement is instructed on the start button 134a side of the external controller 13 and then the end of the measurement is instructed on the end switch 124b side of the self-weight 12 after entering the cabin 1c, the instructions are invalid. Thus, an error corresponding to the weight of the measurement operator is prevented from being added to the calculated load weight change amount value.

  In step S37, it is determined whether or not the power button has been pressed. If the answer is no, the process returns to step S25, and if yes, the process proceeds to step S57.

  The work returning from step S37 to step S25 represents a loop for waiting for the end of measurement when the end button is not pressed, and the measurement process can be ended by pressing the power button during the wait.

  On the other hand, if the end button is pressed in step S33 or step S35, the process proceeds to step S39, and the display is fixed with the current load weight change amount value displayed on the display 122 immediately before the end button is pressed (step S39). Next, the current load weight change value displayed and fixed is recorded in the memory card 16 via the card writer 125 (step S41), and then the current load weight change value fixed to the digital tachograph 17 is recorded. Data is transmitted (step S43). The digital tachograph 17 receives the fixed current load weight change value data and writes the received current load weight change value data to the memory card 18.

  Next, the load weight change value data in the memory area of the print data of the EEPROM 121 cleared in step S5 is updated with the fixed current load weight change value data (step S45). That is, in the case of loading, a positive current load weight change value which is increased from 0 kg and finally fixed and updated is stored as update data in the memory area of the print data in the EEPROM 121. In the case of unloading, a negative current load weight change value which is decreased from 0 kg and is finally fixed and updated is stored as update data in the memory area of the print data in the EEPROM 121.

  In other words, in the case of loading, the fixed load weight change amount value (that is, the load purchase amount) after the increase due to loading after the start of the load weight change amount measurement is used as update data in the EEPROM 121. Stored in the memory area for printing data. In the case of unloading, the fixed load weight change value (that is, the load supply amount) after reduction due to unloading after the start of the load weight change measurement is printed in the EEPROM 121 as update data. It is stored in the memory area for data.

  Next, it is determined whether or not the issue button has been pressed (step S47). If the answer is yes, the printer 123 is caused to print the weighing slip (step S49), and then the process proceeds to step S51. If the answer to step S47 is no, the process directly proceeds to step S51.

  In step S51, it is determined whether or not the re-measurement button 134c is pressed. If the answer is yes, the process returns to step S7, and if no, the process proceeds to step S53.

  In step S53, it is determined whether or not the ignition key switch is turned on / off. If the answer is yes, the process returns to step S7, and if no, the process proceeds to step S55. In this determination, if it is determined in step S23 that the ignition key switch has been turned on, if the ignition key switch has been turned off after that, it is turned on and off. If not, it is determined no. That is, it is determined that the ignition key switch is turned on in step S23, and then the ignition key switch is kept on without being turned off or in step S23. When it is determined that the switch has been turned off, the ignition key switch is subsequently turned on or kept off.

  In step S55, it is determined whether or not the power button has been pressed. If the answer is no, the process returns to step S47, and if yes, the process proceeds to step S57.

  The work returning from step S55 to step S47 represents a loop for waiting for the end of the measurement process when the power button is not pressed, and the measurement process can be ended by pressing the power button during the wait.

  That is, if it is determined in step 55 that the power button has been pressed, the power of the self-weighing system 10 is turned off, and then the measurement process is terminated.

  As described above, according to the present invention, the start and end of measurement can be instructed by an external operation device that can be arranged in the vicinity of a work place such as unloading away from the dead weight, so that operability is good and handling is possible. Can provide an excellent self-weighing system.

  Further, when the start of measurement is instructed on the side of the self-weigh scale 12, the end of measurement can be instructed on the side of the self-weight scale 12, but the end of measurement cannot be instructed on the side of the external operation unit 13. When the start of measurement is instructed on the side, the end of measurement can be instructed on the side of the external controller 13, but since the end of measurement cannot be instructed on the side of the self-weight meter 12, the measurement of the load weight change amount is started. In addition, it is possible to prevent an erroneous operation at the time of instructing termination, and an error corresponding to the weight of the measurement operator does not occur.

  Furthermore, since the external operation device 13 that can be arranged in the vicinity of the work place such as unloading away from the self-weight is provided with a re-measurement button 134c for instructing restart of measurement after the end of measurement, measurement start → measurement By performing a button operation of end → re-measurement → start measurement → end measurement, for example, when loading a load to a customer, it is wholesaled to two separate tanks at one stop position, and the amount of wholesale to each tank is measured It is very easy to operate.

  The self-weight meter 12 does not have a configuration corresponding to the re-measurement button. However, if it is desired to instruct re-measurement on the self-weight scale 12 side, the ignition key is turned on and off once in step S53. Since it is determined that the switch is turned on and off and the process returns to step S7, remeasurement can be performed in the same manner as when the remeasurement button 134c of the external controller 13 is pressed.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to this, and various modifications and applications are possible.

  For example, in the above-described best mode, the CPU 120a includes the I / O port P1 to which the external operation device 13 that instructs the start and end of the measurement operation from the outside is connected as an external device. An external input I / O port for receiving an external input signal from the device may be additionally provided.

It is a schematic block diagram which shows the self-weighing system which concerns on the best form of this invention. It is a block diagram which shows the structural example of the dead weight in the dead weight system of FIG. It is a schematic block diagram which shows the external operating device in the dead weight system of FIG. It is a flowchart which shows the measurement process which CPU in the dead weight of FIG. 2 performs. It is a flowchart which shows the measurement process which CPU in the dead weight of FIG. 2 performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Self-weighing system 11 Sensor 12 Self-weighting machine 120 Microcomputer (calculation means)
120a CPU (calculation means)
P1 I / O port for external device connection P2 I / O port for external device connection 124a Start switch (first start instruction means)
124b End switch (first end instruction means)
13 External controller (external device)
134a Start button (second start instruction means)
134b End button (second end instruction means)
134c Re-measurement button (re-measurement instruction means)

Claims (3)

Sensor for measuring vehicle weight change, load switch, calculation means for calculating load weight change based on output of the sensor, first start instruction for instructing start of load weight change measurement And a self-weighing system having a first end instruction means for instructing the end of the load weight change amount measurement, and a self-weighing scale installed in a cabin including a driver's cab of the vehicle,
The self-weight meter includes a microcomputer that is connected to the sensor, the first start instruction unit, and the first end instruction unit, controls the operation of the entire system, and serves as the calculation unit.
The microcomputer has an I / O port for connecting an external device,
The I / O port includes second start instruction means for instructing start of load weight change amount measurement, and second end instruction means for instructing end of load weight change amount measurement, and the external device As an external operating device that is installed outside the cabin of the vehicle and that operates the second start instruction means and the second end instruction means is connected ,
When the measurement start is instructed by the first start instruction means, the instructions from the second start instruction means and the second end instruction means are invalidated during the measurement operation,
When the measurement start is instructed by the second start instructing means, the instructions from the first start instructing means and the first end instructing means are invalidated during the measuring operation. Total system. Sensor for measuring vehicle weight change, load switch, calculation means for calculating load weight change based on output of the sensor, first start instruction for instructing start of load weight change measurement And a self-weighing system having a first end instruction means for instructing the end of the load weight change amount measurement, and a self-weighing scale installed in a cabin including a driver's cab of the vehicle,
A second start instructing unit that is connected to the self-weigh scale and instructs the self-weight to start the load weight change amount measurement; and a second end instructing unit that instructs the end of the load weight change amount measurement. And an external operating device that is installed outside the cabin of the vehicle as an external device and operates the second start instruction means and the second end instruction means,
When the measurement start is instructed by the first start instruction means, the instructions from the second start instruction means and the second end instruction means are invalidated during the measurement operation,
When the measurement start is instructed by the second start instructing unit, the instructions from the first start instructing unit and the first end instructing unit are invalidated during the measurement operation.
A self-weighing system characterized by that. The self-weighing system according to claim 1 or 2,
The external controller further includes a remeasurement instruction means for instructing remeasurement after a measurement end instruction,
The self-weight is instructed to re-measure when the re-measurement instructing means or the ignition key is operated, and re-measured when the re-measurement instructing means is not operated after the measurement end instruction and the ignition key is operated. Be directed
A self-weighing system characterized by that.

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