JP7458953B2 - Fuel leak detection system, fuel leak determination device - Google Patents

Description

This disclosure relates to a fuel leak detection system, etc.

For example, in a system where fuel can be supplied from a supply source to multiple fuel supply machines (fueled objects) through a shared pipe and multiple individual pipes branching from the shared pipe, fuel leaks into the shared pipe. A technique is known in which a sensor capable of detecting is installed (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 9-30600

However, in order to detect fuel leakage not only in the shared pipe line but also in each of the plurality of individual pipe lines, it may be necessary to install sensors in all of the shared pipe line and the plurality of individual pipe lines. Therefore, the cost of the entire system for detecting fuel leakage may be relatively high.

Therefore, in view of the above issues, in a system that can supply fuel from a supply source to multiple fuel supply machines, we developed a technology that can detect fuel leaks in shared pipes and multiple individual pipes using fewer sensors. The purpose is to provide.

To achieve the above object, in one embodiment of the present disclosure,
a plurality of fuel supply machines that supply fuel to the fuel supply target;
A fuel supply pipe including a shared pipe line for sending fuel from a fuel supply source to the plurality of fuel supply machines, and a plurality of individual pipe lines connecting between the shared pipe line and each of the plurality of fuel supply machines. road and
a plurality of flowmeters that are provided at connection points between the shared pipe line and each of the plurality of individual pipe lines and measure the flow rate of the fuel;
In a state where fuel is not being supplied by the plurality of fuel supply devices, based on the flow rate measurement results of each of the plurality of flowmeters, the shared pipe of the fuel supply pipes and the plurality of individual A fuel leakage determination device that determines the location of fuel leakage from within the pipe,
A fuel leak detection system is provided.

Additionally, in other embodiments of the present disclosure,
a plurality of fuel supply machines that supply fuel to the fuel supply target;
A fuel supply pipe including a shared pipe line for sending fuel from a fuel supply source to the plurality of fuel supply machines, and a plurality of individual pipe lines connecting between the shared pipe line and each of the plurality of fuel supply machines. road and
a plurality of flow direction detection devices that are provided at connection points between the shared pipe line and each of the plurality of individual pipe lines and detect the flow direction of the fuel;
the shared pipe line among the fuel supply pipe lines based on the detection result of the fuel flow direction by each of the plurality of flow direction detection devices in a state where fuel is not supplied by the plurality of fuel supply machines; and a fuel leakage determination device that determines a fuel leakage location from among the plurality of individual pipes.
A fuel leak detection system is provided.

In still other embodiments of the present disclosure,
A plurality of fuel supply machines that supply fuel to the fueled body, a shared pipe line that sends fuel from a fuel supply source to the plurality of fuel supply machines, and a connection between the shared pipe line and the plurality of fuel supply machines. A fuel leak detection device for detecting fuel leakage in a fuel supply system having a fuel supply pipe including a plurality of individual pipes connected to each other,
an acquisition unit that acquires the measurement results of a plurality of flowmeters that measure the flow rate of fuel, which are provided at connection points between the shared pipe line and each of the plurality of individual pipe lines;
In a state where the plurality of fuel supply devices are not supplying fuel, the shared pipe of the fuel supply pipes and the plurality of a determination unit that determines a fuel leakage location from within the individual pipes;
A fuel leak detection device is provided.

In still another embodiment of the present disclosure,
A fuel leakage detection device for detecting a fuel leakage in a fuel supply system having a plurality of fuel supply machines that supply fuel to a fuel supply target body, a shared pipeline that sends fuel from a fuel supply source to the plurality of fuel supply machines, and a fuel supply pipeline including a plurality of individual pipelines that connect the shared pipeline and each of the plurality of fuel supply machines,
an acquisition unit that acquires detection results of a plurality of flow direction detection devices that detect a flow direction of fuel and are provided at connection points between the shared pipeline and each of the plurality of individual pipelines;
a determination unit that determines a fuel leakage location from the shared pipeline and the plurality of individual pipelines of the fuel supply pipeline based on a detection result of a fuel flow direction by each of the plurality of flow direction detection devices in a state in which the fuel supply by the plurality of fuel supply machines is not being performed,
A fuel leak detection device is provided.

According to the above-described embodiment, in a system that can supply fuel from a common supply source to a plurality of fuel supply machines, fuel leakage can be prevented for each upstream pipe line including a shared pipe line and for each of a plurality of fuel supply pipes. Detection can be achieved with fewer sensors.

FIG. 1 is a diagram showing an example of a fuel leakage detection system. FIG. 4 is a diagram for explaining a method for determining a fuel leakage location. FIG. 3 is a diagram illustrating a method for determining a fuel leak location. FIG. 3 is a diagram illustrating a method for determining a fuel leak location. 3 is a flowchart illustrating an example of a control process related to fuel leakage detection. FIG. 3 is a diagram illustrating a method for determining a fuel leak location. FIG. 3 is a diagram illustrating a method for determining a fuel leak location. 12 is a flowchart illustrating another example of control processing related to fuel leakage detection.

Embodiments will be described below with reference to the drawings.

[Configuration of fuel leak detection system]
First, the configuration of a fuel leakage detection system 1 will be described with reference to FIG.

FIG. 1 is a diagram showing an example of a fuel leakage detection system 1. As shown in FIG.

As shown in FIG. 1, the fuel leak detection system 1 includes a fuel supply system 10, a flow meter 20, and a fuel leak detection device 30.

The fuel supply system 10 introduces fuel from a storage tank 11 to a fuel supply machine 12, and supplies the fuel to a specified fuel supply object through the fuel supply machine 12. The fuel supply object is, for example, a railroad car, a ship, an automobile, etc. The fuel is, for example, diesel fuel (light oil).

The fuel supply system 10 includes a storage tank 11 , a fuel supply machine 12 , and a fuel supply line 13 .

The storage tank 11 (an example of a fuel supply source) stores fuel.

The fuel supply device 12 supplies fuel introduced from the storage tank 11 through the fuel supply pipe 13 to the fuel-supplied body. Specifically, the fuel supply pipe 13 (main pipe 131M to be described later) between the fuel supply machine 12 and the storage tank 11 is provided with a pump that pumps fuel under pressure, and the fuel in the storage tank 11 is supplied with the power of the pump. is introduced into the fuel supply machine 12.

The fuel supply device 12 is provided with a nozzle that can be inserted into the fuel supply port of the object to be fueled, and the fuel introduced from the storage tank 11 flows out from the tip of the nozzle in response to a user's operation. Thereby, the user can replenish fuel to the fuel target object by inserting the nozzle into the refueling port of the fuel target object and performing a predetermined operation.

The fuel supply machine 12 includes a plurality of (in this embodiment, three) fuel supply machines 12A to 12C. Hereinafter, regarding multiple configurations distinguished by "A", "B", and "C" in the symbols, these multiple configurations will be treated comprehensively or as any one of the multiple configurations. , "A", "B", and "C" in the symbols may be replaced with "X". For example, the fuel supply machines 12A to 12C may be collectively referred to as the "fuel supply machine 12X", or any one of the fuel supply machines 12A to 12C may be individually referred to as the "fuel supply machine 12X".

Note that the number of fuel supply devices 12 included in the fuel supply system 10 may be two, or four or more.

The fuel supply line 13 connects the storage tank 11 to the fuel suppliers 12A to 12C. In the following description, the storage tank 11 side is considered to be the upstream side when viewed from a point on the fuel supply line 13, and the fuel suppliers 12A to 12C side are considered to be the downstream side.

The fuel supply line 13 includes a shared line 131 and an individual line 132.

The shared pipeline 131 extends from the storage tank 11 and sends fuel from the storage tank 11 to the fuel supply devices 12A-12C. The shared pipeline 131 is composed of a main pipeline 131M that extends from the storage tank 11, and branch pipelines 131A-131C that branch off from the main pipeline 131M to each of the fuel supply devices 12A-12C.

Solenoid valves 14A to 14C are provided at the branch portions (inlets) of each of the branch pipes 131A to 131C from the main pipe 131M. Thereby, the fuel supplied from the main pipe 131M to each of the branch pipes 131A to 131C can be cut off using the electromagnetic valves 14A to 14C.

In addition, solenoid valves 15A to 15C are provided at the downstream ends (tips) of the branch pipes 131A to 131C, respectively.

The individual pipe line 132 is located downstream of the electromagnetic valves 15A to 15C, and sends the fuel supplied through the shared pipe line 131 (branch pipe lines 131A to 131C) to each of the fuel supply machines 12A to 12C. Individual conduit 132 includes individual conduits 132A to 132C.

Individual conduits 132A to 132C connect between solenoid valve 15A and fuel supply machine 12A, between solenoid valve 15B and fuel supply machine 12B, and between solenoid valve 15C and fuel supply machine 12C, respectively.

A bypass pipe 133A that bypasses the electromagnetic valve 15A is provided between the branch pipe 131A and the individual pipe 132A. A solenoid valve 16A is provided in the bypass conduit 133A.

Similarly, a bypass line 133B that bypasses the electromagnetic valve 15B is provided between the branch line 131B and the individual line 132B. A solenoid valve 16B is provided in the bypass conduit 133B.

Similarly, a bypass pipe 133C that bypasses the electromagnetic valve 15C is provided between the branch pipe 131C and the individual pipe 132C. A solenoid valve 16C is provided in the bypass conduit 133C.

Bypass pipes 133A to 133C may be excluded from the detection (determination) of the presence or absence of fuel leakage and the location of fuel leakage, which will be described later. For example, the bypass pipelines 133A to 133C have very short path lengths compared to the shared pipeline 131 (main pipeline 131M and branch pipelines 131A to 131C) and the individual pipelines 132 (individual pipelines 132A to 132C). , and has relatively high durability. In addition, the bypass pipes 133A to 133C are configured so that respective pipe parts on the upstream side and downstream side of the flow meter 20X are included in the branch pipe line 131X and the individual pipe line 132X. and may be included in the detection (judgment) of fuel leak locations.

Note that the bypass conduits 133A to 133C may be omitted.

The solenoid valves 14A to 14C are normally open. This allows fuel to flow from the main pipe 131M to the individual pipes 132A to 132C through the branch pipes 131A to 131C.

Solenoid valves 15A-15C are normally open, and solenoid valves 16A-16C are normally closed. As a result, between the branch pipe line 131A and the individual pipe line 132A, between the branch pipe line 131B and the individual pipe line 132B, and between the branch pipe line 131C and the individual pipe line 132C, the solenoid valves 15A to 132C are connected, respectively. It communicates through 15C. Therefore, fuel flowing into the branch pipes 131A to 131C from the main pipe 131M is introduced into the fuel supply machines 12A to 12C through the electromagnetic valves 15A to 15C.

When the fuel leak detection device 30 detects the presence or absence of a fuel leak in the fuel supply system 10 (fuel supply line 13), the solenoid valves 15A to 15C are closed and the solenoid valves 16A to 16C are opened. In this case, the branch line 131A and the individual line 132A, the branch line 131B and the individual line 132B, and the branch line 131C and the individual line 132C are connected via the bypass lines 133A, 133B, and 133C (solenoid valves 16A to 16C), respectively.

The flow meter 20 measures the flow rate of fuel in the bypass pipes 133A-133C when fuel is not being supplied to the fuel supply object by the fuel supply devices 12A-12C. The flow meter 20 is, for example, a minute flow meter capable of measuring the flow rate of a minute fuel flow caused by a fuel leak. The flow meter 20 may also be capable of detecting the direction of fuel flow in the individual pipes 132.

Flowmeter 20 includes flowmeters 20A to 20C.

The flowmeter 20A (an example of a flow direction detection device) is provided in the bypass pipe 133A, upstream of the solenoid valve 16A. This allows the flowmeter 20A to measure the flow rate of fuel between the shared pipe 131 (branch pipe 131A) and the individual pipe 132A through the bypass pipe 133A. The flowmeter 20A outputs a signal (measurement signal) corresponding to the measurement value of the flow rate, and the measurement signal is taken into the fuel leak detection device 30 through a specified communication line. The measurement value of the flow rate may include information regarding the direction of the flow. For example, the measurement value of the flowmeter may be expressed as a positive value in the case of a flow toward the downstream side, and as a negative value in the case of a flow toward the upstream side. In addition to the measurement value data, the measurement signal may also include data indicating the direction of the flow.

The predetermined communication line may be, for example, a one-to-one communication line. Further, the predetermined communication line may include, for example, a local network (LAN: Local Area Network) within a facility where the fuel supply system 10 is installed. Further, the predetermined communication line may include, for example, a wide area network (WAN). The wide area network may include, for example, a mobile communication network terminating in a base station. Furthermore, the wide area network may include, for example, a satellite communication network that uses communication satellites. Further, the wide area network may include, for example, the Internet network. Further, the predetermined communication line may include, for example, a wireless short-distance communication line. The short-range communication line may include, for example, a communication line based on the Bluetooth (registered trademark) standard or a communication line based on the WiFi standard. The same may apply to the communication line between the flowmeters 20B, 20C and the fuel leak detection device 30.

As described above, if the bypass line 133A is omitted, the flowmeter 20A is provided in the branch line 131A or the individual line 132A near the solenoid valve 15A.

The flow meter 20B (an example of a flow direction detection device) is provided upstream of the electromagnetic valve 16B in the bypass conduit 133B. Thereby, the flow meter 20B can measure the flow rate of fuel between the shared pipe line 131 (branch pipe line 131B) and the individual pipe line 132B through the bypass pipe line 133B. The flow meter 20B outputs a signal (measurement signal) corresponding to the measured value of the flow rate, and the measurement signal is taken into the fuel leak detection device 30 through a predetermined communication line.

In addition, as mentioned above, when the bypass line 133B is omitted, the flow meter 20B is provided in the branch line 131B or the individual line 132B near the electromagnetic valve 15B.

The flow meter 20C (an example of a flow direction detection device) is provided upstream of the electromagnetic valve 16C in the bypass conduit 133C. Thereby, the flow meter 20C can measure the flow rate of fuel between the shared pipe line 131 (branch pipe line 131C) and the individual pipe line 132C through the bypass pipe line 133C. The flowmeter 20C outputs a signal (measurement signal) corresponding to the measured value of the flow rate, and the measurement signal is taken into the fuel leak detection device 30 through a predetermined communication line.

As described above, when the bypass line 133C is omitted, the flow meter 20C is provided in the branch line 131C or the individual line 132C near the solenoid valve 15C.

The fuel leakage detection device 30 detects fuel leakage in the fuel supply system 10 (fuel supply pipe line 13) and determines the location of the fuel leakage.

The fuel leak detection device 30 (an example of a fuel leak determination device) may be, for example, a terminal device installed in an office or the like inside the facility where the fuel supply system 10 is installed. The terminal device may be, for example, a stationary terminal device such as a desktop computer terminal, or a portable terminal (mobile terminal) such as a smartphone, tablet terminal, or laptop computer terminal. The fuel leak detection device 30 may also be a server device installed inside or outside the facility where the fuel supply system 10 is installed. The server device may be an edge server installed inside the facility where the fuel supply system 10 is installed or in another facility located relatively close to this facility, or it may be a cloud server installed in another facility located relatively far from this facility.

The functions of the fuel leak detection device 30 may be realized by arbitrary hardware, or a combination of arbitrary hardware and software. For example, the fuel leak detection device 30 includes a CPU (Central Processing Unit), a memory device such as a RAM (Random Access Memory), a non-volatile auxiliary storage device such as a ROM (Read Only Memory), and a device for input/output with the outside. It is mainly composed of interface devices, etc. The fuel leak detection device 30 includes, for example, an information acquisition unit 301 and a leak detection unit 302 as functional units realized by loading a program installed in an auxiliary storage device into a memory device and executing it by a CPU.

The information acquisition unit 301 (an example of an acquisition unit) acquires (receives) the measurement signals (an example of measurement results, detection results) of the flow meters 20A to 20C via a specified communication line.

The leakage detection unit 302 (an example of a determination unit) detects fuel leakage in the fuel supply system 10 (fuel supply pipe 13) based on the measurement signal acquired by the information acquisition unit 301 (that is, determines whether or not there is a fuel leakage). judge). Furthermore, when determining that there is a fuel leak in the fuel supply system 10 (fuel supply conduit 13), the leak detection unit 302 further determines the location of the fuel leak.

[First example of method for determining fuel leak location]
Next, a first example of a method for determining a fuel leak location in the fuel supply system 10 will be described with reference to FIGS. 2 to 5.

<Summary>
FIGS. 2 to 4 are diagrams illustrating a method for determining a fuel leak location. Specifically, FIG. 2 shows the flow rate when fuel is leaking in the shared pipe line 131 (in this example, the main pipe line 131M) upstream of the flow meters 20A to 20C in the fuel supply pipe line 13. FIG. 3 is a diagram showing the integrated value of the flow rate of fuel (hereinafter referred to as "integrated flow rate") flowing to the installation locations of the total number 20A to 20C and the direction of the flow. Further, FIG. 3 shows a case where fuel is leaking on the downstream side (in this example, individual pipe 132A) of one flow meter 20X (in this example, flow meter 20A) in the fuel supply pipe 13. FIG. 3 is a diagram showing the integrated flow rate and flow direction of fuel flowing to the installation locations of flowmeters 20A to 20C. Further, FIG. 4 shows that fuel leaks on the downstream side (in this example, individual pipes 132A and 132C) of the two flow meters 20X (in this example, flow meters 20A and 20C) in the fuel supply pipe 13. FIG. 4 is a diagram showing the integrated flow rate and flow direction of fuel flowing to the installation locations of flowmeters 20A to 20C when the fuel flowmeter is installed. In the following, the present example will be described on the assumption that the fuel supply devices 12A to 12C are not supplying fuel to the fuel supply target.

2 to 4, the branched pipelines 131A to 131C and the individual pipelines 132A to 132C are simply shown when fuel leakage in the fuel supply pipeline 13 is detected, that is, when the solenoid valves 15A to 15C are closed and the solenoid valves 16A to 16C are closed. Specifically, the bypass pipeline 133X is omitted in FIGS. 2 to 4, and the pipeline portion upstream of the flowmeter 20X is represented as the branched pipeline 131X, and the pipeline portion downstream of the flowmeter 20X is represented as the individual pipeline 132X. In this case, the bypass pipeline 133X may be excluded from the detection of fuel leakage, as described above, or the pipeline portions upstream and downstream of the flowmeter 20X may be included in the detection of fuel leakage, as included in the branched pipeline 131X and the individual pipeline 132X, respectively. The same applies to the cases of FIGS. 6 and 7 described below.

Further, in FIGS. 2 to 4, the integrated flow rate and direction of the flow of fuel flowing to each of the installation locations of the flowmeters 20A to 20C are represented by the thickness of the white arrow and the direction of the arrow. The same applies to the cases of FIGS. 6 and 7, which will be described later.

As shown in FIGS. 2 to 4, a case will be considered in which fuel leakage occurs at any location in the fuel supply pipe 13.

When fuel is not being supplied to the fuel supply object by the fuel supply devices 12A-12C, if there is no fuel leakage in the fuel supply line 13, the fuel inside the fuel supply line 13 does not flow upstream or downstream and is in a substantially stationary state.

On the other hand, when a fuel leak occurs in the fuel supply pipe 13, the fuel inside the fuel supply pipe 13 flows toward the location of the fuel leak. Therefore, as shown in FIGS. 2 to 4, fuel flows toward the leak location even at the locations where the flow meters 20A to 20C are installed. Therefore, the leakage detection unit 302 can determine that fuel leakage has occurred in the fuel supply pipe 13 when fuel is flowing at the locations where the flowmeters 20A to 20C are installed.

For example, the leak detection unit 302 may determine that a fuel leak has occurred in the fuel supply pipe 13 when the measured values of the flow meters 20A to 20C are all equal to or higher than the threshold Th11. For example, the leak detection unit 302 determines that fuel leakage has occurred in the fuel supply pipe 13 when at least some of the measured values of the flow meters 20A to 20C are equal to or higher than the threshold Th11. You may judge. In other words, the leakage detection unit 302 may determine that fuel leakage has occurred in the fuel supply pipe 13 when the measured value of at least one flowmeter 20X of the flowmeters 20A to 20C is equal to or greater than the threshold Th11. . The threshold value Th11 (an example of a first threshold value) is set in advance as a lower limit value at which the leakage detection unit 302 can determine that fuel is flowing due to fuel leakage at the installation locations of the flowmeters 20A to 20C, for example, through experiments and simulations. stipulated. Further, the threshold value Th11 is preset to a value larger than the flow rate measured by the flowmeters 20A to 20C, for example, due to vibrations transmitted from the surroundings. The vibrations transmitted from the surroundings to the fuel supply pipe 13 include, for example, vibrations caused by the running of a train when the object of fuel supply (the object to be supplied with fuel) by the fuel supply system 10 is a train. Thereby, the leakage detection unit 302 can distinguish between fuel leakage and vibrations transmitted to the fuel supply pipe 13 using the threshold value Th11, and can suppress false detection of fuel leakage.

In addition, the leakage detection unit 302 calculates a value obtained by integrating the measured values of the flowmeters 20A to 20C over a predetermined period (hereinafter referred to as "accumulated flow rate measurement value" for convenience), as in the case of determining the leakage location described later. Based on this, it may be determined whether or not fuel leakage has occurred in the fuel supply pipe line 13. Specifically, the leakage detection unit 302 detects that fuel leakage has occurred in the fuel supply pipe 13 when the measured value of at least one flowmeter 20X among the flowmeters 20A to 20C is equal to or higher than a predetermined threshold. It may be determined that there is.

Further, as shown in FIG. 2, a case will be considered in which fuel leakage occurs in the shared pipe line 131 upstream of the flow meters 20A to 20C in the fuel supply pipe line 13.

In this case, at the locations where the flowmeters 20A to 20C are installed, the fuel inside the individual pipes 132A, 132B, and 132C flows from the downstream side to the upstream side. Therefore, due to fuel leakage in the shared pipe 131, the cumulative flow rate passing through each of the flowmeters 20A to 20C can be considered to be approximately equal to the internal capacity of each of the individual pipes 132A, 132B, and 132C. . The internal capacity of each of the individual conduits 132A, 132B, and 132C can be known in advance from, for example, design data. Therefore, in the leak detection unit 302, the difference in the cumulative flow rates at the installation locations of the flowmeters 20A to 20C is approximately equal to the difference in the internal capacity of the individual pipes 132A, 132B, and 132C. In this case, it can be determined that fuel leakage has occurred in the shared pipe line 131. In particular, in a situation where the internal capacities of the individual pipes 132A, 132B, and 132C are approximately the same, the leak detection unit 302 detects that the shared pipe It can be determined that fuel leakage has occurred at road 131.

For example, the leakage detection unit 302 detects that the shared pipe 131 is injected with fuel when the difference between the integrated values of the measured values of the flowmeters 20A to 20C (integrated flow rate measurement value) is equal to or less than a predetermined threshold Th12. It may be determined that a leak has occurred. The threshold value Th12 (an example of a second threshold value) is, for example, the cumulative flow rate at the installation location of the flowmeters 20A to 20C, which is assumed from the difference in the internal capacity of each of the individual pipes 132A, 132B, and 132C. This is predefined as the upper limit value of the difference between them. Further, the threshold Th12 may be, for example, the maximum value of the mutual difference in capacity within the pipes between the flow meter 20X and the fuel supply device 12X (supply valve) in each of the individual pipes 132A to 132C.

Additionally, as shown in FIGS. 3 and 4, fuel leakage has occurred in the individual pipes 132X on the downstream side of some of the flowmeters 20X of the flowmeters 20A to 20C in the fuel supply pipe 13. Consider the case.

In this case, among the flowmeters 20A to 20C, the shared pipe 131 of fuel flows from the upstream side to the downstream side. Further, the shared pipe line 131 has a sufficiently larger capacity than the individual pipe line 132X on the downstream side of the flow meter 20X. Therefore, among the flowmeters 20A to 20C, the cumulative flow rate of fuel passing through the installation location of the flowmeter 20X where fuel leakage has occurred on the downstream side becomes relatively large.

On the other hand, at the installation location of flowmeter 20X (flowmeters 20B and 20C in FIG. 3 and flowmeter 20B in FIG. 4) where no fuel leakage occurs downstream among flowmeters 20A to 20C, fuel in individual pipe 132X downstream of flowmeter 20X flows out toward shared pipe 131. Then, the outflowing fuel flows through shared pipe 131 into the leakage location downstream (individual pipe 132X) of flowmeter 20X where fuel leakage occurs downstream among flowmeters 20A to 20C. In addition, the internal capacity of the downstream portion (individual pipe 132X) of the installation location of flowmeter 20A to 20C is sufficiently small compared to the internal capacity of shared pipe 131. Therefore, the cumulative flow rate of fuel passing through the installation location of flowmeter 20X where no fuel leakage occurs downstream among flowmeters 20A to 20C becomes relatively small.

Therefore, when the cumulative flow rate measurement value of one of the flowmeters 20X among the flowmeters 20A to 20C is sufficiently larger than the cumulative flow rate measurement value of the other flowmeters 20X, the leakage detection unit 302 detects the cumulative flow rate measurement value of the one flowmeter 20X. It can be determined that fuel leakage has occurred in the individual pipe line 132X on the downstream side.

For example, the leakage detection unit 302 may determine that a fuel leak is occurring downstream of one of the flowmeters 20X when the integrated flow measurement value of one of the flowmeters 20A to 20C is equal to or greater than the integrated flow measurement value of the other flowmeters 20X plus the threshold value Th13. The threshold value Th13 (an example of a third threshold value) is determined in advance, for example, by using design data of the fuel supply line 13, taking into consideration the difference in length of the pipes constituting the shared line 131 and the individual lines 132A to 132C, that is, the difference between the internal capacities of each pipe. The threshold value Th13 may also be determined in advance, for example, through experiments or simulations, as the lower limit of the difference in integrated flow rate occurring between the installation location of the flowmeter 20X where fuel leakage is occurring downstream and the installation location of the flowmeter 20X where fuel leakage is not occurring downstream. The threshold value Th13 is also greater than the threshold value Th12. This is because the difference in capacity between the shared pipeline 131 and each of the individual pipelines 132A, 132B, and 132C is much larger than the difference in capacity between the individual pipelines 132A, 132B, and 132C.

As described above, in this example, the fuel leak detection device 30 determines the fuel leak location in the fuel supply system 10 (fuel supply pipe 13) based on the relative comparison of the cumulative flow rate measurement values for each of the flowmeters 20A to 20C. specific).

<Control processing related to fuel leak detection>
FIG. 5 is a flowchart schematically showing an example of a control process related to fuel leak detection (hereinafter referred to as "fuel leak detection process").

This flowchart is started, for example, when a request signal for fuel leakage detection is received by the fuel leakage detection device 30. The request signal for fuel leakage detection may be output, for example, in response to a predetermined input from the user. The request signal for fuel leakage detection may also be automatically output at a predetermined timing, for example, during a time period when the fuel supply devices 12A-12C are not in use (e.g., at night, etc.). When this flowchart is executed, as described above, the solenoid valves 14A-14C are opened, the solenoid valves 15A-15C are closed, and the solenoid valves 16A-16C are opened. At the start of this flowchart, the solenoid valves 14A-14C, the solenoid valves 15A-15C, and the solenoid valves 16A-16C may be switched to the above states in response to a control command from the fuel leakage detection device 30. Furthermore, when this flowchart is executed, the fuel supply devices 12A to 12C may be controlled to be in an unusable state, or a notification indicating that the fuel supply devices 12A to 12C are unusable may be displayed on the display of the fuel supply devices 12A to 12C. The same may be true for the flowchart in FIG. 8 described below.

As shown in FIG. 5, in step S102, the leak detection unit 302 determines whether the measured values αi (i=1, 2, 3) of the flowmeters 20A to 20C are equal to or greater than the threshold Th11. Measured values α1 to α3 represent flow rate measurements of flowmeters 20A to 20C, respectively. Specifically, as described above, the leakage detection unit 302 may determine whether the measured value of at least one flowmeter 20X among the flowmeters 20A to 20C is equal to or greater than the threshold Th11. If the measured value of at least one of the flowmeters 20X of the flowmeters 20A to 20C is equal to or greater than the threshold Th11, the leakage detection unit 302 determines that fuel leakage has occurred in the fuel supply pipe 13, and proceeds to step S104. . On the other hand, if the measured values of each of the flowmeters 20A to 20C are not equal to or greater than the threshold Th11, the leakage detection unit 302 determines that fuel leakage has not occurred in the fuel supply pipe 13, and ends the process of the current flowchart. .

Note that, in step S102, the leakage detection unit 302 may determine whether all of the measured values of the flowmeters 20A to 20C are equal to or greater than the threshold Th11, as described above.

In step S104, the leak detection unit 302 determines whether all of the mutual differences |βj-βk| (j≠k) of the integrated flow measurement values βi (i=1, 2, 3) of the flow meters 20A-20C are equal to or less than the threshold value Th12. The integrated flow measurement values β1-β3 represent the integrated flow measurement values of the flow meters 20A-20C, respectively. Specifically, the leak detection unit 302 may calculate the mutual differences |βj-βk| for all combinations of two flow meters 20X among the flow meters 20A-20C, and determine whether all of them are equal to or greater than the threshold value Th12. If all of the mutual differences |βj-βk| of the integrated flow measurement values βi of the flow meters 20A-20C are equal to or less than the threshold value Th12, the leak detection unit 302 proceeds to step S106, and otherwise proceeds to step S108.

In step S106, the leak detection unit 302 determines that there is a fuel leak location in the shared pipe line 131, and records a log indicating this in an auxiliary storage device or the like.

When the process of step S106 is completed, the fuel leak detection device 30 ends the process of the current flowchart.

On the other hand, in step S108, the leakage detection unit 302 determines that the accumulated flow rate measurement value βj of one of the flowmeters 20X among the flowmeters 20A to 20C adds a threshold Th13 to the accumulated flow rate measurement value βk of the other flowmeter 20X. It is determined whether or not the value is greater than or equal to the specified value. The leak detection unit 302 detects all combinations of two flowmeters 20X among the flowmeters 20A to 20C (specifically, a combination of flowmeters 20A and 20B, a combination of flowmeters 20A and 20C, and a flowmeter 20B, 20C combination)), the above determination is performed sequentially. If there is at least one combination of one flowmeter 20X and another flowmeter 20X that satisfies the above conditions, the leak detection unit 302 proceeds to step S110, and if not, proceeds to step S112.

In step S110, the leak detection unit 302 determines that there is a fuel leak in an individual pipe 132X downstream of one of the flowmeters 20X among the combinations that satisfy the above conditions, and records a log indicating this in an auxiliary storage device, etc.

When the fuel leak detection device 30 completes the processing of step S110, it ends the processing of this flowchart.

On the other hand, in step S112, the leak detection unit 302 determines that the location of the fuel leak cannot be determined, and records a log indicating this in an auxiliary storage device or the like.

When the process of step S112 is completed, the fuel leak detection device 30 ends the process of the current flowchart.

Note that steps S108 and S112 may be omitted, and the fuel leakage detection device 30 may proceed to step S110 if the determination condition of step S104 is not satisfied. In this case, in step S110, the leak detection unit 302 determines that a fuel leak has occurred in (any one of) the plurality of individual pipes 132X, and records a log indicating this in an auxiliary storage device or the like. It's fine.

<Effect>
As described above, in this example, the fuel leakage detection device 30 detects the fuel supply pipe based on the flow rate measurement results of the plurality of flowmeters 20X when fuel is not being supplied by the plurality of fuel supply devices 12X. The fuel leak location is determined from among the shared pipe line 131 of the lines 13 and the plurality of individual pipe lines 132X.

As a result, the fuel leak detection device 30 can determine the location of a fuel leak from the shared pipeline 131 and the multiple individual pipelines 132X, even if the shared pipeline 131 is not provided with a sensor capable of detecting a fuel leak. Therefore, the fuel leak detection device 30 can detect fuel leaks in the shared pipeline 131 and each of the multiple individual pipelines 132X using fewer sensors (flow meters 20X). This allows the overall cost of the fuel leak detection system 1 to be reduced.

Further, in this example, the fuel leakage detection device 30 detects that the measured value of at least one flowmeter 20X among the plurality of flowmeters 20X is a threshold value Th11 in a state where fuel is not supplied by the plurality of fuel supply devices 12X. If the above is true and the difference in the cumulative flow rate measurement values for each of the plurality of flowmeters 20X is equal to or less than the threshold Th12, it may be determined that fuel leakage has occurred in the shared pipe line 131.

Thereby, the fuel leakage detection device 30 can specifically determine fuel leakage in the shared pipe line 131 even if the shared pipe line 131 is not provided with a sensor capable of detecting fuel leakage.

Further, in this example, the fuel leakage detection device 30 detects that the measured value of at least one flowmeter 20X among the plurality of flowmeters 20X is a threshold value Th11 in a state where fuel is not supplied by the plurality of fuel supply machines 12X. If the above is true and the difference in the cumulative flow rate measurement values for each of the plurality of flowmeters 20X exceeds the threshold Th12, it may be determined that fuel leakage has occurred in the plurality of individual pipes 132X.

As a result, the fuel leak detection device 30 can detect whether the fuel leakage point is in the shared pipe line 131 or not, even if the shared pipe line 131 is not provided with a sensor that can detect fuel leakage. (i.e., a plurality of individual conduits 132X).

In addition, in this example, the fuel leakage detection device 30 detects that the measured value of at least one flowmeter 20X among the plurality of flowmeters 20X is a threshold value when fuel is not being supplied by the plurality of fuel supply devices 12X. Th11 or more, and the cumulative flow rate measurement value of one of the plurality of flowmeters 20X is equal to or greater than the sum of the cumulative flow rate measurement value of the other flowmeter 20X and a threshold value Th13 larger than the threshold value Th12. In this case, it may be determined that fuel leakage has occurred in the individual pipe line 132X on the downstream side of the first flow meter 20X.

As a result, the fuel leakage detection device 30 can detect that the fuel leakage point is specifically the shared pipe line 131 including the shared pipe line 131 even if the shared pipe line 131 is not provided with a sensor capable of detecting fuel leakage. It can be determined whether it is a specific individual pipe line 132X or a specific individual pipe line 132X.

In the case of this example (first example), the flowmeters 20A to 20C may have specifications that do not allow them to detect the direction of flow. The same may apply to the second and third examples described below.

[Second Example of Method for Determining Fuel Leakage Location]
Next, a second example of the method for determining the location of a fuel leak in the fuel supply system 10 will be described with reference to FIGS.

FIG. 6 is a diagram illustrating a method for determining a fuel leak location. Specifically, FIG. 6 shows the flowmeters 20A to 20C when fuel is leaking on the downstream side of all the flowmeters 20A to 20C (individual pipes 132A, 132B, 132C) in the fuel supply pipe 13. 20C is a diagram showing the integrated flow rate and flow direction of fuel flowing to the installation location of 20C.

As shown in FIG. 2, a case will be considered in which fuel leakage occurs in the shared pipe line 131 upstream of the flow meters 20A to 20C in the fuel supply pipe line 13.

In this case, at the locations where the flow meters 20A to 20C are installed, fuel flows out from the individual pipelines 132A, 132B, and 132C, respectively, into the shared pipeline 131. Therefore, the integrated flow rate of fuel passing through the locations where the flow meters 20A to 20C are installed is sufficiently small compared to the case where fuel flows from the shared pipeline 131 (branch pipeline 131X) into the individual pipeline 132X. Therefore, when the integrated flow rates for each of the flow meters 20A to 20C are all very small, the leak detection unit 302 can determine that a fuel leak is occurring in the shared pipeline 131, including the shared pipeline 131.

For example, the leakage detection unit 302 may determine that fuel leakage has occurred in the shared pipe line 131 when the cumulative flow rate measurement value of each of the flowmeters 20A to 20C is less than or equal to a predetermined threshold Th21. The threshold Th21 is, for example, a value obtained by adding a predetermined margin to the upper limit of the cumulative flow rate of fuel passing when fuel leakage occurs downstream of the flowmeters 20A to 20C through experiments and simulations. good.

Further, as shown in FIGS. 3, 4, and 6, a case will be considered in which fuel leakage occurs downstream of some or all of the flow meters 20A to 20C.

In this case, fuel flows from the shared pipe 131 into the individual pipe 132X at the installation location of the flowmeter 20X where fuel leakage is occurring downstream among the flowmeters 20A to 20C. Therefore, the cumulative flow rate of fuel passing through the installation location of the flowmeter 20X where fuel leakage is occurring downstream is sufficiently larger than when fuel flows out from the individual pipe 132X to the shared pipe 131 (branch pipe 131X). Therefore, when the cumulative flow rate of fuel passing through the installation location of the flowmeter 20X is sufficiently larger than when fuel flows out from the individual pipe 132X to the shared pipe 131 (branch pipe 131X), the leakage detection unit 302 can determine that fuel leakage is occurring in the individual pipe 132X downstream of the flowmeter 20X.

For example, the leak detection unit 302 may determine that fuel leakage has occurred in the individual pipe line 132X on the downstream side of the flow meter 20X when the cumulative flow rate measurement value of the flow meter 20X is larger than the above-mentioned threshold Th21. As a result, for example, as shown in FIG. 6, even if fuel leakage occurs downstream of all the flowmeters 20A to 20C (individual pipe lines 132A to 132C), the leakage detection unit 302 will detect the flowmeters 20A to 20C. It can be determined that fuel leakage has occurred downstream of 20C.

In this way, in this example, the fuel leak detection device 30 can determine (identify) the location of a fuel leak in the fuel supply system 10 (fuel supply line 13) based on the absolute value of the integrated flow measurement value of the flow meter 20X.

[Third example of method for determining fuel leak location]
Next, a third example of a method for determining a fuel leak location in the fuel supply system 10 will be described with reference to FIGS. 2 to 4, 6, and 7.

Figure 7 shows the cumulative flow rate and flow direction of fuel flowing to the installation locations of flowmeters 20A-20C when fuel is leaking from both the shared line 131 (in this example, main line 131M) and the individual line 132X (in this example, individual line 132A downstream of flowmeter 20A) in the fuel supply line 13.

As shown in FIG. 7, a case will be considered in which fuel leakage occurs in both the shared pipe line 131 and the individual pipe line 132X (individual pipe line 132A).

In this case, the fuel in the shared pipe line 131 flows into the individual pipe line 132A and leaks to the outside from a leakage point in the main pipe line 131M. Therefore, as shown in FIG. 3, when there is a fuel leakage point only in the individual pipe line 132X (individual pipe line 132A), the cumulative flow rate of fuel flowing into the individual pipe line 132X from the shared pipe line 131 decreases. . Therefore, the leak detection unit 302 determines that the cumulative flow rate of fuel passing through the installation location of the flow meter 20X where fuel leakage has occurred on the downstream side is the cumulative flow rate expected when no fuel leakage occurs in the shared pipe line 131. If it is smaller than the flow rate, it can be determined that fuel leakage has occurred in the shared pipe line 131 as well.

Note that whether or not fuel leakage has occurred downstream of the flowmeter 20X may be determined by using the determination method of the first example or the second example described above.

For example, if the cumulative flow rate measurement value of the flowmeter 20X where fuel leakage occurs on the downstream side is less than or equal to a predetermined threshold Th31, the leak detection unit 302 determines that fuel leakage is also occurring in the shared pipe line 131. You can judge. For example, through experiments and simulations, the threshold value Th31 is the lower limit value of the cumulative flow rate of fuel passing through the installation location of the flow meter 20X where fuel leakage occurs on the downstream side when no fuel leakage occurs in the shared pipe line 131. It is set in advance as . Further, the threshold value Th31 is varied depending on the number of individual pipe lines 132X in which fuel leakage has occurred among the individual pipe lines 132A, 132B, and 132C. Specifically, the threshold value Th31 is set to become smaller as the number of individual pipe lines 132X in which fuel leakage occurs among the individual pipe lines 132A, 132B, and 132C increases. As shown in FIGS. 3, 4, and 6, as the number of individual pipes 132X in which fuel leakage occurs among the individual pipes 132A, 132B, and 132C increases, the number of individual pipes 132X This is because the cumulative flow rate of fuel flowing into the fuel tank decreases.

In this way, in this example, when a fuel leak occurs in the downstream portion of the flowmeter 20X (individual pipeline 132X), the fuel leak detection device 30 can also determine whether a fuel leak is occurring in the shared pipeline 131.

[Fourth example of method for determining fuel leak location]
Next, a fourth example of a method for determining a fuel leak location in the fuel supply system 10 will be described with reference to FIGS. 2 to 4, FIG. 6, and FIG. 8.

＜Overview＞
As shown in FIGS. 2 to 4, 6 and 8, a case where a fuel leak occurs at an arbitrary location in the fuel supply pipe 13 will be considered.

As described above, when a fuel leak occurs in the fuel supply pipe 13, the fuel inside the fuel supply pipe 13 flows toward the location of the fuel leak. Therefore, as shown in FIGS. 2 to 4 and 6, fuel flows toward the leak location even at the locations where the flow meters 20A to 20C are installed. Therefore, the leakage detection unit 302 can determine that fuel leakage has occurred in the fuel supply pipe 13 when fuel is flowing at the locations where the flowmeters 20A to 20C are installed.

For example, the leak detection unit 302 may determine that a fuel leak has occurred in the fuel supply pipe 13 when fuel is flowing at all of the locations where the flow meters 20A to 20C are installed. Further, the leakage detection unit 302 may determine that fuel leakage has occurred in the fuel supply pipe 13 when fuel is flowing in at least a part of the installation location of the flowmeter 20X. In other words, the leak detection unit 302 determines that a fuel leak has occurred in the fuel supply pipe 13 when fuel is flowing at at least one of the installation locations of the flow meters 20A to 20C. good.

Further, as shown in FIG. 2, a case will be considered in which fuel leakage occurs in the shared pipe line 131 upstream of the flow meters 20A to 20C in the fuel supply pipe line 13.

In this case, fuel flows from the downstream side to the upstream side at all locations where the flow meters 20A to 20C are installed. Therefore, the leak detection unit 302 determines that a fuel leak has occurred in the shared pipe line 131 when the direction of the fuel flow detected by the flowmeters 20A to 20C is from the downstream side to the upstream side. be able to.

Furthermore, as shown in FIGS. 3, 4, and 6, a case will be considered in which fuel leakage occurs on the downstream side (individual pipe line 132X) of some or all of the flow meters 20A to 20C.

In this case, fuel flows from the upstream side to the downstream side at the location of the flowmeter 20X where fuel leakage is occurring downstream. Therefore, when part or all of the direction of the fuel flow detected by the flowmeters 20A to 20C is from the upstream side to the downstream side, the leakage detection unit 302 may determine that fuel leakage is occurring in the individual pipe 132X downstream of the flowmeter 20X that detected the flow from the upstream side to the downstream side.

<Control processing related to fuel leak detection>
FIG. 8 is a flowchart schematically showing another example of the fuel leakage detection process.

As shown in FIG. 8, in step S202, the leak detection unit 302 determines whether or not a fuel flow is detected by the flow meters 20A-20C, regardless of the direction. Specifically, the leak detection unit 302 may determine whether or not a fuel flow is detected by at least one flow meter 20X of the flow meters 20A-20C, as described above. If a fuel flow is detected by at least one flow meter 20X of the flow meters 20A-20C, the leak detection unit 302 determines that a fuel leak is occurring in the fuel supply pipe 13, and proceeds to step S204. On the other hand, if a fuel flow is not detected by any of the flow meters 20A-20C, the leak detection unit 302 determines that no fuel leak is occurring in the fuel supply pipe 13, and ends the processing of this flowchart.

In step S204, if the leak detection unit 302 detects a flow from the downstream side to the upstream side in all the flowmeters 20A to 20C, the process proceeds to step S206. On the other hand, if the leak detection unit 302 detects a flow from the upstream side to the downstream side in some or all of the flowmeters 20A to 20C, the process proceeds to step S208.

In step S206, the leak detection unit 302 determines that there is a fuel leak in the shared pipeline 131, and records a log indicating this in an auxiliary storage device, etc.

When the fuel leak detection device 30 completes the processing of step S206, it ends the processing of this flowchart.

On the other hand, in step S208, the leakage detection unit 302 determines that there is a leakage point in the individual pipe line 132X downstream of the flow meter 20X where the flow from the upstream side to the downstream side is detected, and logs a log indicating that. is recorded in an auxiliary storage device, etc.

When the process of step S208 is completed, the fuel leak detection device 30 ends the process of the current flowchart.

<Effect>
In this way, in this example, the fuel leakage detection device 30 detects the flow direction of fuel by each of the plurality of flowmeters 20X while the plurality of fuel supply machines 12X is not supplying fuel. The fuel leak location is determined from among the shared pipe line 131 of the fuel supply pipe line 13 and the plurality of individual pipe lines 132X.

Thereby, the fuel leak detection device 30 determines the location of fuel leakage from the shared pipe line 131 and the plurality of individual pipe lines 132X even if the shared pipe line 131 is not provided with a sensor capable of detecting fuel leakage. can do. Therefore, the fuel leak detection device 30 can detect fuel leaks for each of the shared pipe line 131 and the plurality of individual pipe lines 132X using fewer sensors (flow meters 20X). Therefore, the overall cost of the fuel leakage detection system 1 can be suppressed.

Further, in this example, the fuel leak detection device 30 detects the flow of fuel by at least one of the plurality of flowmeters 20X, and all of the plurality of flowmeters 20X move from the downstream side to the upstream side. If a flow in this direction is detected, it may be determined that a fuel leak has occurred in the shared pipe line 131.

Thereby, the fuel leak detection device 30 can specifically determine fuel leakage in the shared pipe line 131 even if the shared pipe line 131 is not provided with a sensor capable of detecting fuel leakage.

Further, in this example, when one of the plurality of flowmeters 20X detects the flow of fuel from the upstream side to the downstream side, the fuel leakage detection device 30 detects the flow of fuel downstream of the one flowmeter 20X. It may be determined that fuel leakage has occurred in the individual pipe line 132X on the side.

As a result, even if the shared pipe line 131 is not provided with a sensor that can detect fuel leakage, the fuel leak detection device 30 can determine whether the fuel leak location is in the shared pipe line 131 or in the individual pipe line 132X. It can be determined whether

In this example, the flow meters 20A to 20C may be replaced with a specific device (an example of a flow direction detection device) that can detect only the direction of fuel flow.

[Transformation/Change]
Although the embodiments have been described in detail above, the present disclosure is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist described in the claims.

For example, in the embodiment described above, some or all of the first to third examples described above may be combined with the fourth example described above. That is, in the above-described embodiment, the fuel leakage detection device 30 determines the fuel leakage location in the fuel supply pipe 13 based on both the flow rate measurement result and the flow direction detection result by the flowmeter 20X. good.

Further, in the above-described embodiment, the fuel leak location in the fuel supply pipe 13 is determined using the integrated flow rate measurement value of the flow meter 20X, but the fuel flow continues at the location where the flow meter 20X is installed. The determination may be made based on the length of time (hereinafter referred to as "flow duration time"). The flow duration time may be a duration during which the flow meter 20X continues to output a measured value greater than zero. Alternatively, it may be the duration of time during which the flow meter 20X as a flow direction detection device continues to detect the flow of fuel. It is thought that the flow rate of fuel generated by a fuel leak does not change much depending on a change in the leak location, and the flow duration time becomes longer as the integrated flow rate increases. Therefore, the fuel leak detection device 30 can determine the leak location using the flow duration time, similarly to the case where the integrated flow rate is used. For example, when determining which individual pipe line 132X among the plurality of individual pipe lines 132X is experiencing fuel leakage, it is assumed that the flow rate is not measured by one flowmeter 20X (flow rate ≒ 0). If the other flowmeter 20X continues to measure a flow rate greater than zero, it may be determined that fuel leakage has occurred in the individual pipe line 132X downstream of the other flowmeter 20X. Specifically, in one individual pipe 132X where fuel leakage has occurred, the cumulative flow rate of fuel flowing inside is larger than in the other individual pipes 132X, and the flow meter 20X indicates a flow rate greater than zero. It also takes longer to measure. Therefore, if the first flow meter 20X is continuously measuring a flow rate greater than zero for a longer period of time than the other flow meters 20X, the fuel leak detection device 30 detects that It can be determined that fuel leakage has occurred in the road 132X.

1 Fuel leak detection system 10 Fuel supply system 11 Storage tank (fuel supply source)
12, 12A to 12C Fuel supply machine 13 Fuel supply line 131 Shared line 131A to 131C Branch line 131M Main line 132, 132A to 132C, 132X Individual lines 133A to 133C Bypass line 14A to 14C Solenoid valve 15A to 15C Solenoid valve 16A to 16C Solenoid valve 20, 20A to 20C, 20X Flow meter (flow direction detection device)
30 Fuel leakage detection device (fuel leakage determination device)
301 Information acquisition unit (acquisition unit)
302 Leak detection unit (determination unit)

Claims (7)

a plurality of fuel supply machines that supply fuel to the fuel supply object;
A fuel supply pipe including a shared pipe line for sending fuel from a fuel supply source to the plurality of fuel supply machines, and a plurality of individual pipe lines connecting between the shared pipe line and each of the plurality of fuel supply machines. road and
a plurality of flowmeters that are provided at connection points between the shared pipe line and each of the plurality of individual pipe lines and measure the flow rate of the fuel;
In a state where fuel is not being supplied by the plurality of fuel supply machines, based on the measurement results of the flow rates of each of the plurality of flowmeters, the common pipe among the fuel supply pipes and the plurality of individual pipes A fuel leak determination device that determines a fuel leak location from within a road,
Fuel leak detection system. The fuel leakage determination device is configured such that the measured value of at least one of the plurality of flowmeters is equal to or higher than a first threshold value, and the difference between the integrated values of the measured values of the plurality of flowmeters is If it is less than or equal to a second threshold, determining that fuel leakage has occurred in the shared pipe;
The fuel leak detection system according to claim 1. The fuel leak determination device is configured such that a measured value of at least one of the plurality of flowmeters is equal to or greater than the first threshold value, and a difference between the accumulated measurement values of the plurality of flowmeters is equal to or greater than the first threshold value. If the threshold value of 2 is exceeded, it is determined that a leak has occurred in the plurality of individual pipes.
The fuel leak detection system according to claim 2. The fuel leakage determination device is configured such that a measured value of at least one of the plurality of flowmeters is equal to or higher than the first threshold value, and the measured value of one of the plurality of flowmeters is integrated. If the value is greater than or equal to the sum of the measured values of the other flowmeters plus a third threshold larger than the second threshold, the flowmeter of the one of the plurality of individual pipes It is determined that a fuel leak has occurred in an individual pipe on the downstream side.
The fuel leak detection system according to claim 2 or 3. a plurality of fuel supply machines that supply fuel to the fuel supply target;
A fuel supply pipe including a shared pipe line for sending fuel from a fuel supply source to the plurality of fuel supply machines, and a plurality of individual pipe lines connecting between the shared pipe line and each of the plurality of fuel supply machines. road and
a plurality of flow direction detection devices that are provided at connection points between the shared pipe line and each of the plurality of individual pipe lines and detect the flow direction of the fuel;
the shared pipe line among the fuel supply pipe lines based on the detection result of the fuel flow direction by each of the plurality of flow direction detection devices in a state where fuel is not supplied by the plurality of fuel supply machines; and a fuel leakage determination device that determines a fuel leakage location from among the plurality of individual pipes.
Fuel leak detection system. A plurality of fuel supply machines that supply fuel to the fuel supply target, a shared pipe line that sends fuel from a fuel supply source to the plurality of fuel supply machines, and a connection between the shared pipe line and the plurality of fuel supply machines. A fuel leak detection device that detects fuel leakage in a fuel supply system having a fuel supply pipe including a plurality of individual pipes connected to each other,
an acquisition unit that acquires the measurement results of a plurality of flowmeters that measure the flow rate of fuel, which are provided at connection points between the shared pipe line and each of the plurality of individual pipe lines;
In a state where fuel is not being supplied by the plurality of fuel supply devices, based on the flow rate measurement results of each of the plurality of flowmeters, the shared pipe of the fuel supply pipes and the plurality of individual a determination unit that determines a location of fuel leakage from within the conduit;
Fuel leak detection device. A fuel leakage detection device for detecting a fuel leakage in a fuel supply system having a plurality of fuel supply machines that supply fuel to a fuel supply target body, a shared pipeline that sends fuel from a fuel supply source to the plurality of fuel supply machines, and a fuel supply pipeline including a plurality of individual pipelines that connect the shared pipeline and each of the plurality of fuel supply machines,
an acquisition unit that acquires detection results of a plurality of flow direction detection devices that detect a flow direction of fuel and are provided at connection points between the shared pipeline and each of the plurality of individual pipelines;
a determination unit that determines a fuel leakage location from the shared pipeline and the individual pipelines of the fuel supply pipeline based on a detection result of a fuel flow direction by each of the flow direction detection devices when fuel is not being supplied by the fuel supply devices,
Fuel leak detection device.

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