JP2005140765A - Method for measuring supplied amount of vehicle-mounted object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for accurately measuring a supplied amount when supplying a vehicle-mounted object such as liquefied gas to a supply destination. <P>SOLUTION: According to this method for measuring a supplied amount when supplying a vehicle-mounted object to a supply destination, a measurement start point F is set based on a time point E at which the lowering speeds of detection values of weighing implements provided at a plurality of spots on a vehicle are equal to or more than a set value for a prescribed time period while a measurement end point I is set based on a time point I at which the lowering speeds of detection values of the weighing implements are less than the set value for a prescribed time period, to calculate the supplied amount of the vehicle-mounted object from detection values at the measurement start and end points F and I. This prevents a change in detection value due to disturbance such as getting on and off of workers from being mistaken for a change in detection value caused by the supply of the vehicle-mounted object, and makes it possible to accurately determine a supply start time point and an end time point on the vehicle-mounted object. Accordingly, accurate measurement is made possible on the supplied amount. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for measuring a supply amount of a load when supplying a load such as liquefied gas loaded on a vehicle such as a lorry vehicle to a supply destination.

Conventionally, in order to supply liquefied gas such as liquefied nitrogen and liquefied oxygen to a supply destination, a lorry vehicle that loads and conveys the liquefied gas in an airtight container has been used.
Hereinafter, an example of a method of supplying liquefied gas from a lorry vehicle to a supply destination will be described with reference to FIG.
The discharge port 3a of the supply path 3 connected to the tank 2 of the lorry vehicle 1 and the filling port 5a of the supply path 5 connected to the storage tank 4 of the supply destination are connected by a charge hose 6 (connection pipe line).
The valves 12 and 13 of the supply path 3 are opened, the liquefied gas 7 is introduced into the supply path 5 of the supply destination through the charge hose 6, and the storage tank 4 is filled with the liquefied gas 7 through the paths 17 and 18. After filling, the valves 12 and 13 are closed and the charge hose 6 is removed.
Reference numeral 19 denotes a lead-out path for taking out the liquefied gas 7 from the storage tank 4.

When supplying the liquefied gas, it is necessary to measure the amount of the liquefied gas supplied to the storage tank 4. There is an integrated flow meter as a device for measuring the supply amount. However, when the flow rate of a liquefied gas having a low boiling point is measured with an integrated flow meter, the measurement accuracy is not stable and often deteriorates.
Therefore, in order to measure the supply amount of the liquefied gas, a method is adopted in which the weight of the lorry vehicle is measured before and after supply to the supply destination, and the decrease amount is set as the supply amount.
However, when there is no measuring instrument for measuring the weight of a lorry vehicle, it is necessary to move the lorry vehicle to a weighing station equipped with a measuring device, and this movement requires a lot of time and fuel. is there.
Therefore, a method has been proposed in which a measuring instrument for measuring the weight change of the load is mounted on a lorry vehicle, and the weight change generated at the supply site is measured as the liquefied gas supply amount (for example, Japanese Patent Application No. 2002-61641). See). According to this method, it is not necessary to move the lorry vehicle to the weighing station for weight measurement.
In addition, as far as the applicant knows, none of the literature known inventions disclosed in patent applications already made by the applicant is related to the application.

In the measurement of the supply amount, it is desired to accurately measure the supply amount so that the measured value can be used as a commercial transaction amount.
However, in the above supply amount measurement method, the measurement start and end times may not coincide with the supply start and end times of the liquefied gas due to an operation error when the operator sets the measurement start and end points. The accuracy may be reduced.
Further, in the above supply process, there are the following weight measurement value change factors in addition to the load weight reduction accompanying the supply of the liquefied gas.
(1) Load weight change due to loading / unloading of charge hose and tools (2) Load weight change due to operator getting on / off of lorry vehicle for loading / unloading of charge hose and tools, etc. (3) Measuring instrument change due to temperature change Change in detected value In the above-described supply amount measuring method, there is also a problem that a measurement error is caused by a variation in the measured value due to these factors.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method capable of accurately measuring a supply amount when supplying a vehicle load such as liquefied gas to a supply destination.

The vehicle load supply amount measuring method according to the present invention is a method for measuring a supply amount when supplying a vehicle load loaded on a vehicle to a supply destination, wherein the vehicle accommodates the vehicle load. And a vehicle main body on which the vehicle body is mounted, and a weight measuring unit, the weight measuring unit including a plurality of measuring instruments for measuring the weight of the vehicle load, and the measuring instruments are connected to each other of the vehicle main body. A measurement start point based on a point in time when the decrease rate of the detection values of the plurality of measuring instruments becomes equal to or higher than a preset value for a predetermined time when the vehicle load is supplied to a supply destination provided at a different position. And a measurement end point is set with reference to a time point when the decrease rate of the detection values of the plurality of measuring instruments becomes less than a preset value for a predetermined time, and the detection value at the measurement start point, The detected value at the end of measurement and And calculates the Luo vehicle cargo supply.
In the present invention, prior to setting of the measurement start point or measurement end point, when at least one of the measuring instruments has an output change amount of a preset set time equal to or greater than a preset threshold, A method in which the measurement start point or the measurement end point is not set for a predetermined time can be employed.
In the present invention, a method is provided in which a plurality of the set times are determined, and the measurement start point or the measurement end point is not set for a predetermined time when at least one of the output change amounts in the plurality of set times becomes equal to or greater than the threshold value. Can take.

The vehicle load supply measuring method of the present invention has the following effects.
(1) In the process in which the vehicle load decreases with the supply to the supply destination, the detection values of the plurality of measuring instruments simultaneously decrease at a constant speed.
The detection value of the weighing instrument may change depending on the operator's getting on and off, etc., but in this case, since a large change in the detection value usually occurs in some of the weighing instruments, the rate of decrease in the detection value is uniform. Don't be.
For this reason, the supply start time of the vehicle load is accurately determined by setting the measurement start point on the basis of the time when the decrease rate of the plurality of detection values becomes equal to or higher than a preset value for a predetermined time. be able to.
In addition, it is possible to accurately determine the supply end point of the vehicle load by setting the measurement end point on the basis of the time point when the decrease rate of the plurality of detection values becomes less than a preset value for a predetermined time. it can.
For this reason, it is possible to prevent a detection value change due to disturbance such as getting on and off by an operator from being mistaken for a detection value change due to vehicle load supply. Therefore, accurate supply amount measurement is possible.
(2) Since the measurement start point and the end point are set based on the detection value decrease rate, the measurement start time and the end time can be accurately matched at the start and end of supply of the vehicle load.
Therefore, the measurement start and end point settings do not differ depending on the operator, and accurate supply amount measurement is possible.
(3) Since the measurement start point and end point are set based on the detection value decrease rate, the measurement start point and measurement end point can be automatically set.
Therefore, it is possible to prevent the occurrence of measurement error due to an operation error, as compared with the method of setting the measurement start point and the measurement end point by the operator's operation.
(4) Since the measurement start point and end point are set based on the detection value decrease rate, a complicated device is not required, and the device configuration can be simplified.

3 to 5 show a lorry vehicle 1 which is a vehicle that can be used in an example of the measurement method of the present invention. The lorry vehicle 1 includes a tank 2, a vehicle body 20 on which the tank 2 is mounted, and a weight measurement. Part 21.
The tank 2 is a substantially sealed container, and is a pressure-resistant container that can accommodate liquefied gas (vehicle load) such as liquefied oxygen and liquefied nitrogen.
The vehicle body 20 includes a cab 22 (cab), a main frame 23 extending rearward from the cab 22, a subframe 24 provided on the main frame 23, a wheel portion 25, and a leaf spring 26. I have.
The wheel portion 25 includes a front wheel portion 27, an intermediate wheel portion 28, and a rear wheel portion 29, and each wheel portion 27, 28, 29 includes an axle 30 and a tire 31.
The leaf spring 26 is provided between the main frame 23 and the axle 30.

As shown in FIG. 5, the weight measurement unit 21 includes a sensor unit 32 that is a measuring instrument for measuring the weight of the liquefied gas 7, and a calculation unit that calculates and displays the liquefied gas supply amount based on the detection value of the sensor unit 32. 33.
The sensor unit 32 includes a sensing element (not shown) for detecting compressive strain, a base assembly (not shown) that holds the sensing element and is attached to the axle 30, and a case (not shown) that covers the base assembly. The thing provided can be illustrated.
One sensor unit 32 is provided near each end of the axle 30 of each wheel portion 27, 28, 29, that is, a total of six locations.

As shown in FIG. 5, the loads W1, W2 of the tank 2 are applied to the main frame 23 from above.
Loads W1 and W2 applied to the main frame 23 are transmitted to the axles 30 via the leaf springs 26. At this time, upward reaction forces R 1 and R 2 act on the tire 31.
Since these loads W 1 and W 2 and reaction forces R 1 and R 2 act on the axle 30, slight distortion occurs in the axle 30, and the amount of distortion is detected by the sensor unit 32.
In the sensor unit 32, a detection signal corresponding to the amount of distortion is obtained as a voltage, and a detection value converted into a frequency (Hz) is output.
Since the strain amount detection by the sensor unit 32 is performed by the three wheel portions 27, 28 and 29, a total of six strain amount detection values are obtained. Based on this detection value, the weight change of the liquefied gas 7 in the tank 2 can be detected.

Next, an example of a method for measuring the supply amount of the liquefied gas when supplying the liquefied gas in the tank 2 to the storage tank 4 as the supply destination will be described. In the following description, FIG. 2 is used in addition to FIGS. 1 and 3 to 5.
FIG. 1 is a graph showing changes with time in the output from the sensor unit 32. This output is a detection value corresponding to the amount of distortion.
The output of the sensor unit 32 fluctuates (drift) due to changes in the temperature of the sensor unit 32 due to radiation or heat transfer from the road surface or high-temperature parts of the vehicle body (engine, brake pads, differential gear, etc.) even when there is no change in the load weight. There are things to do.
In the illustrated example, there is no change in the weight of the load between the time when the lorry vehicle is stopped (symbol A) and the time point B when the operator (driver) gets off the lorry vehicle 1, but due to the temperature change of the sensor unit 32 or the like. The output is gradually increasing.
When the worker gets out of the vehicle, a decrease in output corresponding to the weight of the worker occurs (reference B). At this time, a particularly large output drop occurs in the sensor unit 32 of the front wheel portion 27 close to the cab 22.
Next, the operator loads and unloads charge hoses and tools as necessary. When loading and unloading charge hoses and tools, a particularly large output change occurs in the sensor unit 32 at a position close to the installation location.

As shown in FIG. 2, the operator connects the discharge port 3 a of the supply path 3 connected to the tank 2 and the filling port 5 a of the supply path 5 connected to the storage tank 4 of the supply destination to the charge hose 6 (connection pipe). Connected by road).
Next, after the liquefied gas 7 is guided to the evaporator 10 through the path 9 and partially vaporized, the pressure in the tank 2 is increased by returning it to the tank 2 through the path 11.

Next, the operator gets on the rear part of the vehicle body 20 and performs the following valve operation to start the supply of the liquefied gas 7. At this time, an output increase corresponding to the weight of the operator occurs (reference C in FIG. 1).
The valves 12 and 13 of the supply path 3 are opened, the liquefied gas 7 is introduced into the supply path 5 of the supply destination through the charge hose 6, and the storage tank 4 is filled with the liquefied gas 7 through the supply paths 17 and 18.
In order to supply the liquefied gas 7 to the storage tank 4, a pump 35 provided in the supply path 3 can also be used.

As shown in FIG. 1, as the amount of liquefied gas in the tank 2 decreases, the output of the sensor unit 32 starts to decrease.
At time D when the worker gets off the vehicle again, a decrease in output corresponding to the weight of the worker occurs.
At times C and D when the worker gets on and off, a particularly large output change occurs in the sensor unit 32 of the rear wheel portion 29 close to the worker's getting on and off position.
Prior to filling the storage tank 4 with the liquefied gas 7, the purge valve 14 is opened for a predetermined time in order to sufficiently cool each path and the charge hose 6, and the liquefied gas 7 or its vaporized gas is discharged from the path 15 outside the system. It is preferable to discharge it.

After the time point D when the operator finishes the valve operation and gets off, the output of the six sensor units 32 decreases at a substantially constant speed as the amount of liquefied gas in the tank 2 decreases. At this time, the outputs of the six sensor units 32 are substantially equal to each other.
In this measurement method, the output changes of the six sensor units 32 are observed, and when the output decrease speeds (output change speeds) of the six sensor units 32 are all equal to or higher than a preset set value for a predetermined time, It is determined that the supply of the liquefied gas 7 to the supply destination has started.
In the illustrated example, the time point F corresponding to one minute before the time point E at which the output reduction speeds of the six sensor units 32 are all 0.2 Hz / min or more is continued for one minute as a reference. The starting point of measurement. Note that the calculation unit 33 detects the output value of the sensor unit 32 at regular intervals (for example, 0.5 seconds).
Hereinafter, the fact that the output reduction speeds of the six sensor units 32 are all equal to or higher than the set value (for example, 0.2 Hz / min) for a predetermined time (for example, 1 minute) is referred to as a start condition.

After the completion of filling, the operator gets on the rear part of the vehicle body 20 again (reference numeral G), closes the valves 12 and 13 and stops the supply of the liquefied gas 7.
At the time point G when the worker gets on, the output increases corresponding to the weight of the worker, and at the time point H when the worker gets off, the output decreases. After the getting off time H, since the supply of the liquefied gas 7 is stopped, the output change is almost eliminated.
It is determined that the supply of the liquefied gas 7 to the supply destination is completed when all the output reduction speeds of the six sensor units 32 are less than a preset value for a predetermined time.
In the illustrated example, the time point I at which the state where the output reduction speeds of the six sensor units 32 are all less than 0.2 Hz / min is continued for one minute is defined as the measurement end point.
The measurement start point F and the measurement end point I can be automatically set in the calculation unit 33.
Hereinafter, the fact that the output reduction speeds of the six sensor units 32 are all less than the set value (for example, 0.2 Hz / min) for a predetermined time (for example, 1 minute) is referred to as an end condition.
In the method of this example, the time point when the output decrease rate is less than the set value for a predetermined time is set as the measurement end point. However, the measurement end point may not coincide with the above time point.

  Since the output change amount from the measurement start point F to the measurement end point I corresponds to the decrease amount of the liquefied gas 7 in the tank 2, the output change amount to the storage tank 4 based on the output difference between the measurement start point F and the measurement end point I. The supply amount of the liquefied gas 7 can be calculated by the calculation unit 33.

The measurement method has the following effects.
(1) As described above, in the process in which the liquefied gas 7 in the tank 2 decreases as the liquefied gas 7 is supplied to the supply destination, the output reduction speeds of the six sensor units 32 are substantially equal to each other and substantially constant. Become.
The output of the sensor unit 32 may change due to changes in temperature caused by getting on and off of the worker, loading and unloading of charge hoses, etc., and heat transfer from the engine. Of these, large output changes occur, so the output changes of the six sensor units 32 are not uniform.
For this reason, the supply start time of the liquefied gas 7 can be accurately determined by setting the measurement start point F with reference to the time E when the start condition is satisfied.
In addition, by setting the time point I at which the end condition is satisfied as the measurement end point, it is possible to accurately determine the supply end point of the liquefied gas 7.
For this reason, it can prevent that the output change by disturbance (a worker's boarding / alighting, loading / unloading of a charge hose, a temperature change, etc.) is mistaken for the output change by liquefied gas supply.
Therefore, accurate supply amount measurement is possible.
(2) Since the measurement start point and the end point are set based on the output decrease rate of the sensor unit 32, the measurement start time and the end time can be accurately matched at the start and end of the supply of the liquefied gas, respectively.
Therefore, the measurement start and end point settings do not differ depending on the operator, and accurate supply amount measurement is possible.
(3) Since the measurement start point and the end point are set based on the output reduction speed of the sensor unit 32, the measurement start point and the measurement end point can be automatically set in the calculation unit 33.
Therefore, it is possible to prevent the occurrence of measurement error due to an operation error, as compared with the method of setting the measurement start point and the measurement end point by the operator's operation.
(4) Since the measurement start point and end point are set based on the output decrease rate of the sensor unit 32, other sensors and control units are not required in addition to the sensor unit 32 and the calculation unit 33, and weight measurement is performed. The configuration of the unit 21 can be simplified.

In the measurement method described above, the supply amount measurement may become inaccurate due to an operator getting on and off, loading and unloading of a charge hose, and the like.
For example, when the measurement is started in a state where the worker gets on the lorry vehicle 1 and the worker gets off before the end of the measurement, the calculated liquefied gas supply is reduced to reduce the load weight corresponding to the worker weight. The amount becomes larger than the actual supply amount. On the contrary, when the measurement is started in a state where the operator is not in the lorry vehicle 1 and the operator gets in before the measurement is finished, the calculated supply amount of the liquefied gas becomes smaller than the actual supply amount. End up.

For this reason, when a large output change occurs due to disturbance (e.g., getting on / off of a worker, charging / discharging of a charge hose, temperature change, etc.), the measurement start point or measurement end point is not set for a predetermined time. It is preferable to set the measurement start point or the measurement end point based on the output reduction rate.
For example, in at least one of the sensor units 32, the output change amount (absolute value) for a preset time (for example, 0.5 seconds and 5 seconds) is equal to or greater than a preset threshold value (for example, 1 Hz). In such a case, it is preferable to determine that there has been a disturbance such as getting on and off by an operator and not to set the measurement start point or the measurement end point for a predetermined time (for example, one minute).
This threshold value can be determined according to an assumed disturbance factor. For example, when it is assumed that a worker gets on and off as a disturbance, it is preferable to set a threshold value according to an output fluctuation corresponding to the weight of the worker.

It is preferable to set a plurality of the set times. For example, the set time can be 0.5 seconds and 5 seconds. In this case, when at least one of the output change amounts in the two set times becomes equal to or greater than the threshold value, it is determined that there is a disturbance such as getting on and off by the worker.
That is, the difference between the output of the sensor unit 32 at the reference time and the output before 0.5 seconds is calculated, and the difference between the output at the reference time and the output before 5 seconds is calculated. When at least one of the values becomes equal to or higher than the threshold value (for example, 1 Hz), it is determined that there is a disturbance.
As a result, even when the output changes in a short time (for example, loading and unloading of a charge hose, etc.) or even when the output changes gradually in a long time (for example, getting on and off by an operator), it is possible to reliably detect the output change. it can.
Hereinafter, when at least one of the sensor units 32 has an output change amount (absolute value) of a set time (for example, 0.5 seconds and 5 seconds) equal to or greater than a threshold value (for example, 1 Hz), it is referred to as a boarding / alighting condition.

FIG. 6 is a flowchart showing a specific example of the measuring method of the present invention. In the method of this example, as shown below, when the getting-on / off condition is satisfied, the measurement start point or the measurement end point is not set for a predetermined time (for example, one minute).
After starting the work (step S1), in order to monitor whether the output of the sensor unit 32 reaches each of the above conditions (a boarding / alighting condition, a start condition, and an end condition), the memory is activated in the calculation unit 33 (step S2).

When the output of the sensor unit 32 satisfies the boarding / alighting conditions (step S3), it is determined that there has been a disturbance such as the boarding / alighting of the worker, and the measurement start point is not set for a predetermined time (1 minute).
In this case, the memory is cleared (step S4), and monitoring by the memory is started again (step S2).
If the output of the sensor unit 32 does not satisfy the boarding / alighting condition, a predetermined time (1 minute) has elapsed after the memory starts (step S5), and if the start condition is satisfied (step S6), the measurement start point is Set (step S7).
In addition, when the boarding / alighting conditions are satisfied before the output of the sensor unit 32 satisfies the start condition (step S8), the memory is cleared (step S4), and monitoring by the memory is started again (step S2). ).

If the boarding / exiting conditions are satisfied after the start of measurement (step S9), it is determined that there has been a disturbance such as the boarding / alighting of the operator, and the measurement end point is not set for a predetermined time (one minute).
In this case, the memory is cleared (step S10), and monitoring by the memory is started again (step S11).
When the predetermined time (1 minute) has passed without the output of the sensor unit 32 satisfying the boarding / alighting condition (step S12) and the end condition is satisfied (step S13), the measurement end point is set (step S13). S14).
In addition, when the boarding / alighting condition is reached before the output of the sensor unit 32 satisfies the termination condition (step S15), the memory is cleared (step S10), and monitoring by the memory is started again (step S11). .

The measurement method has the following effects.
(1) In at least one of the sensor units 32, when the output change amount (absolute value) of the set time is equal to or greater than the threshold value, the measurement start point or the measurement end point is not set for a predetermined time. When a disturbance such as getting on and off the work vehicle occurs, the measurement start point or the measurement end point can be set after the influence of the disturbance disappears. For example, when the worker temporarily gets on the lorry vehicle 1 after the measurement is started, the measurement end point can be set after the worker gets off the vehicle.
For this reason, it is possible to prevent the supply amount measurement value from being inaccurate due to an output change due to disturbance (e.g., getting on / off the worker, loading / unloading a charge hose, etc., temperature change).
Therefore, the supply amount of the liquefied gas can be accurately determined.
(2) By determining a plurality of the set times, it is possible to reliably detect an output change even when the output changes in a short time due to the disturbance or when the output changes gradually in a long time.

In the above measurement method, when setting the measurement start point and the measurement end point, the time point when all the output decrease speeds of the six sensor units 32 are equal to or larger than the set value (or less than the set value) for a predetermined time is used as a reference. However, in the present invention, even when a part of the sensor unit does not satisfy this condition, the measurement start point and the measurement end point can be determined if the remaining other part satisfies this condition.
For example, in one of the six sensor units 32, even when the output decrease rate does not exceed the set value (or less than the set value) for a predetermined time, if the remaining five sensor units 32 satisfy this condition, the measurement starts. A point (or measurement end point) can be defined.
According to this method, it is possible to prevent a delay in setting the measurement start point or the measurement end point when some sensor units cannot obtain an output corresponding to the load due to a detection delay or the like. Therefore, more accurate supply amount measurement is possible.

Moreover, in this invention, the setting value of each sensor unit may mutually differ.
For example, when the axle 30 of the rear wheel portion 29 is formed to have a larger diameter than the axle 30 of the front wheel portion 27, the amount of distortion is relatively small on the axle 30 of the rear wheel portion 29, so that the rear wheel portion In the sensor unit 32 provided in 29, the output becomes small.
In this case, the set value (for example, 0.1 Hz / min) of the sensor unit 32 of the rear wheel portion 29 is set to be smaller than the set value (for example, 0.2 Hz / min) of the sensor unit 32 of the front wheel portion 27. be able to.
By determining the set value according to the output of the sensor unit 32, erroneous detection can be prevented and highly accurate measurement can be performed.

Further, as illustrated between A and B in FIG. 1, the output of the sensor unit 32 may fluctuate (drift) due to a temperature change or the like.
In the present invention, the output fluctuation can be suppressed by configuring the sensor unit so that the output change due to the temperature change is small.
For this reason, the set value can be reduced, and when an output change due to getting on and off by an operator occurs, it can be reliably prevented that this is mistaken as an output change due to liquefied gas supply. Therefore, accurate supply amount measurement is possible.

Further, when a load having a large specific gravity, for example, liquefied argon (1.398 kg / L) is used as a measurement target, a change in output is larger than that when liquefied nitrogen (0.809 kg / L) is used as a measurement target. .
For this reason, it is preferable to make the said setting value into the value according to the specific gravity of the load. For example, when liquefied argon is a target, it is preferable to set the set value higher than that in the case of liquefied nitrogen.

  In the present invention, when the vehicle load is supplied to the supply destination, it is necessary that the detection values of the measuring instruments provided at a plurality of locations of the vehicle main body are simultaneously reduced at a constant speed. For this reason, it is preferable that a vehicle load is what has fluidity | liquidity, for example, a liquid or gas.

  In the above measurement method, the sensor unit 32 that detects the amount of distortion of the axle 30 is used. Instead, other weight detection means, for example, a load cell provided between the tank 2 and the main frame 23 is used. You can also.

It is a graph which shows the change of the output (detection value) of a sensor unit (meter) in an example of the measuring method of the vehicle load supply amount of the present invention. It is a block diagram which shows the piping which connects the lorry vehicle (vehicle) which can be used with an example of the measuring method of this invention, and the storage tank of a supply destination. It is a side view of the lorry car (vehicle) which can be used with an example of the measuring method of the present invention. It is a top view of the vehicle main body of the lorry vehicle (vehicle) shown in FIG. It is a block diagram which shows the internal structure of the lorry vehicle (vehicle) shown in FIG. It is a flowchart which shows an example of the measuring method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Raleigh vehicle (vehicle) 2 ... Tank (container) 7 ... Liquefied gas (vehicle mounting) 20 ... Vehicle main body 21 ... Weight measuring part 32 ... Sensor unit (meter) ) E: When the rate of decrease in output of all sensor units exceeds a set time for a predetermined time F: Measurement start point I: The rate of decrease in output of all sensor units is a predetermined time , When it becomes less than the set value, measurement end point

Claims (3)

A method of measuring a supply amount when supplying a vehicle load (7) loaded on a vehicle (1) to a supply destination,
The vehicle has a container (2) for accommodating the vehicle load, a vehicle body (20) on which the vehicle is mounted, and a weight measurement unit (21). A plurality of measuring instruments (32) for measuring weight, and these measuring instruments are provided at different positions of the vehicle body;
When supplying the vehicle load to the supply destination, the measurement start point (F) on the basis of the time (E) when the decrease rate of the detection values of the plurality of measuring instruments becomes equal to or higher than a preset value for a predetermined time. Set
The measurement end point (I) is set with reference to the time point (I) when the decrease rate of the detection values of the plurality of measuring instruments becomes less than a preset value for a predetermined time,
A vehicle load supply amount measuring method, comprising: calculating a vehicle load supply amount from a detection value at the measurement start point and a detection value at a measurement end point.   Prior to setting the measurement start point or the measurement end point, when at least one of the measuring instruments has an output change amount of a preset set time equal to or greater than a preset threshold, the measurement start point or The method for measuring the amount of vehicle load according to claim 1, wherein the measurement end point is not set for a predetermined time.   A plurality of the set times are determined, and the setting of the measurement start point or the measurement end point is not performed for a predetermined time when at least one of the output change amounts in the plurality of set times becomes equal to or greater than the threshold value. Item 3. A method for measuring a vehicle load supply amount according to Item 2.

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