JP2022055711A - Fuel leakage detection system and fuel leakage determination device - Google Patents

Abstract

To provide a technology feasible to detect fuel leakage in a sharing duct and a plurality of individual ducts in a system capable of supplying fuel to a plurality of fuel supply machines from a supply source with less number of sensors.SOLUTION: A fuel leakage detection system 1 comprises a sharing duct 131 sending fuel from a storage tank 11 to a plurality of fuel supply machines 12X, a fuel supply duct 13 containing a plurality of individual ducts 132X connecting the sharing duct 131 with each of the plurality of fuel supply machines 12X, a plurality of flow meters 20X disposed on a connecting part between the sharing duct 131 and the plurality of individual ducts 132X and measuring the flow of the fuel, and a fuel leakage detection device 30 determining a leakage location of the fuel from among the sharing duct 131 and the plurality of individual ducts 132X based on the measurement result of the flow of each of the plurality of flow meters 20X in a state in which no fuel supply by the plurality of fuel supply machines 12X is conducted.SELECTED DRAWING: Figure 5

Description

This disclosure relates to a fuel leak detection system and the like.

For example, in a system capable of supplying fuel from a supply source to a plurality of fuel supply machines (fueled units) through a shared pipeline and a plurality of individual pipelines branching from the shared pipeline, fuel leaks to the shared pipeline. A technique for installing a sensor capable of detecting a fuel is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 9-30600

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

Therefore, in view of the above problems, in a system that can supply fuel from a supply source to a plurality of fuel supply machines, a technology that can realize detection of fuel leakage in a shared pipeline and a plurality of individual pipelines with a smaller number of sensors is provided. The purpose is to provide.

In order to achieve the above object, in one embodiment of the present disclosure,
Multiple fuel supply machines that supply fuel to the fueled object, and
A fuel supply pipe including a shared pipeline for sending fuel from a fuel supply source to the plurality of fuel feeders, and a plurality of individual pipelines connecting the shared pipeline and each of the plurality of fuel feeders. The road and
A plurality of flow meters provided at the connection points between the shared pipeline and each of the plurality of individual pipelines to measure the flow rate of fuel, and a plurality of flow meters.
In a state where fuel is not supplied by the plurality of fuel supply machines, the shared pipeline among the fuel supply pipelines and the plurality of individual pipes are based on the measurement results of the respective flow rates of the plurality of flow meters. It is equipped with a fuel leak determination device that determines the location of fuel leakage from the pipeline.
A fuel leak detection system is provided.

Also, in other embodiments of the present disclosure,
Multiple fuel supply machines that supply fuel to the fueled object, and
A fuel supply pipe including a shared pipeline for sending fuel from a fuel supply source to the plurality of fuel feeders, and a plurality of individual pipelines connecting the shared pipeline and each of the plurality of fuel feeders. The road and
A plurality of flow direction detecting devices provided at the connection points between the shared pipeline and each of the plurality of individual pipelines to detect the fuel flow direction, and
In a state where fuel is not supplied by the plurality of fuel supply machines, the shared pipeline among the fuel supply pipelines is based on the detection result of the fuel flow direction by each of the plurality of flow direction detection devices. And a fuel leak determination device for determining a fuel leak location from the plurality of individual pipelines.
A fuel leak detection system is provided.

Further, in still other embodiments of the present disclosure,
A plurality of fuel feeders that supply fuel to the fueled object, a shared pipeline that sends fuel from the fuel supply source to the plurality of fuel feeders, and the shared pipeline and the plurality of fuel feeders. A fuel leak detection device that detects a fuel leak in a fuel supply system having a fuel supply pipeline including a plurality of individual pipelines connecting to each other.
An acquisition unit for acquiring the measurement results of a plurality of flow meters for measuring the flow rate of fuel, which are provided at the connection points between the shared pipeline and each of the plurality of individual pipelines.
In a state where the fuel is not supplied by the plurality of fuel supply machines, the shared pipeline among the fuel supply pipelines and the plurality of fuel supply pipelines are based on the measurement results of the flow rates of the plurality of flow meters. It is equipped with a determination unit that determines the location of fuel leakage from the individual pipelines.
A fuel leak detector is provided.

Further, in still other embodiments of the present disclosure,
A plurality of fuel feeders that supply fuel to the fueled object, a shared pipeline that sends fuel from the fuel supply source to the plurality of fuel feeders, and the shared pipeline and the plurality of fuel feeders. A fuel leak detection device that detects a fuel leak in a fuel supply system having a fuel supply pipeline including a plurality of individual pipelines connecting to each other.
An acquisition unit for acquiring the detection results of a plurality of flow direction detection devices for detecting the fuel flow direction provided at the connection points between the shared pipeline and each of the plurality of individual pipelines.
In a state where the fuel is not supplied by the plurality of fuel supply machines, the shared pipeline among the fuel supply pipelines is based on the detection result of the fuel flow direction by each of the plurality of flow direction detection devices. , And a determination unit for determining a fuel leak location from the plurality of individual pipelines.
A fuel leak detector is provided.

According to the above-described embodiment, in a system capable of supplying fuel to a plurality of fuel supply machines from a common supply source, an upstream line including a shared line and a fuel leak in each of the plurality of fuel supply lines. Detection can be achieved with fewer sensors.

It is a figure which shows an example of a fuel leak detection system. It is a figure explaining the determination method of the fuel leakage part. It is a figure explaining the determination method of the fuel leakage part. It is a figure explaining the determination method of the fuel leakage part. It is a flowchart which shows an example of the control process about fuel leakage detection. It is a figure explaining the determination method of the fuel leakage part. It is a figure explaining the determination method of the fuel leakage part. It is a flowchart which shows the other example of the control process concerning the fuel leakage detection.

Hereinafter, embodiments will be described with reference to the drawings.

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

FIG. 1 is a diagram showing an example of a fuel leak detection system 1.

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 the storage tank 11 into the fuel supply machine 12, and supplies fuel to a predetermined fuel supply body through the fuel supply machine 12. The fueled supply body is, for example, a railroad vehicle, a ship, an automobile, or the like. 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 machine 12 supplies the fuel introduced from the storage tank 11 through the fuel supply pipeline 13 to the fueled feeder. Specifically, a pump for pumping fuel is provided in the fuel supply line 13 (main line 131M described later) between the fuel supply machine 12 and the storage tank 11, and the fuel in the storage tank 11 is powered by the pump. Is introduced into the fuel supply machine 12.

The fuel supply machine 12 is provided with a nozzle that can be inserted into the fuel filler port of the fuel supply body, and the fuel introduced from the storage tank 11 flows out from the tip of the nozzle according to the user's operation. As a result, the user can refuel the fueled feeder by inserting the nozzle into the fuel filler port of the fueled feeder and performing a predetermined operation.

The fuel supply machine 12 includes a plurality of (three in this embodiment) fuel supply machines 12A to 12C. Hereinafter, in order to treat a plurality of configurations distinguished by "A", "B", and "C" in the reference numerals comprehensively or as any one of the plurality of configurations. , "A", "B", and "C" in the code may be read as "X". For example, the fuel supply machines 12A to 12C may be comprehensively referred to, or any one of the fuel supply machines 12A to 12C may be individually referred to as "fuel supply machine 12X".

The fuel supply machine 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 and the fuel supply machines 12A to 12C. Hereinafter, the description will be given with the storage tank 11 side as the upstream side and the fuel supply machines 12A to 12C side as the downstream side when viewed from a certain location of the fuel supply pipeline 13.

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

The shared pipeline 131 is provided so as to extend from the storage tank 11, and fuel is sent from the storage tank 11 to the fuel supply units 12A to 12C. The shared pipeline 131 is composed of a single main pipeline 131M extending from the storage tank 11 and branch pipelines 131A to 131C branching from the main pipeline 131M to the fuel supply units 12A to 12C, respectively. ..

Solenoid valves 14A to 14C are provided at the branch portions (inlet) from the main pipelines 131M of the branch pipelines 131A to 131C. As a result, the solenoid valves 14A to 14C can be used to shut off the fuel supplied from the main pipeline 131M to each of the branch pipelines 131A to 131C.

Further, solenoid valves 15A to 15C are provided at the downstream end (tip) of each of the branch pipelines 131A to 131C.

The individual pipeline 132 is located on the downstream side of the solenoid valves 15A to 15C, and sends fuel supplied through the shared pipeline 131 (branch pipeline 131A to 131C) to each of the fuel supply machines 12A to 12C. The individual pipeline 132 includes the individual pipelines 132A to 132C.

The individual pipelines 132A to 132C connect between the solenoid valve 15A and the fuel supply machine 12A, between the solenoid valve 15B and the fuel supply machine 12B, and between the solenoid valve 15C and the fuel supply machine 12C, respectively.

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

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

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

The bypass pipelines 133A to 133C may be excluded from the targets of the presence / absence of fuel leakage and the detection (determination) of the fuel leakage location, which will be described later. Bypass pipelines 133A to 133C have a very short path length with respect to, for example, shared pipelines 131 (main pipelines 131M and branch pipelines 131A to 131C) and individual pipelines 132 (individual pipelines 132A to 132C). Moreover, the durability is relatively high. Further, in the bypass pipelines 133A to 133C, the presence / absence of fuel leakage, which will be described later, is described in such a manner that the respective pipeline portions on the upstream side and the downstream side of the flow meter 20X are included in the branch pipeline 131X and the individual pipeline 132X, respectively. And may be included in the target of detection (determination) of the fuel leak location.

The bypass pipelines 133A to 133C may be omitted.

Solenoid valves 14A-14C are normally open. As a result, fuel can flow from the main pipeline 131M into the individual pipelines 132A to 132C through the branch pipelines 131A to 131C.

The solenoid valves 15A to 15C are normally opened, and the solenoid valves 16A to 16C are normally closed. As a result, the solenoid valves 15A to between the branch line 131A and the individual line 132A, between the branch line 131B and the individual line 132B, and between the branch line 131C and the individual line 132C, respectively. Communicate through 15C. Therefore, the fuel flowing from the main pipeline 131M into the branch pipelines 131A to 131C is introduced into the fuel supply units 12A to 12C through the solenoid valves 15A to 15C.

Further, when the presence or absence of fuel leakage in the fuel supply system 10 (fuel supply pipeline 13) is detected by the fuel leakage detection device 30, the solenoid valves 15A to 15C are closed and the solenoid valves 16A to 16C are opened. In this case, the bypass line 133A is between the branch line 131A and the individual line 132A, between the branch line 131B and the individual line 132B, and between the branch line 131C and the individual line 132C, respectively. , 133B, 133C (solenoid valves 16A to 16C) communicate with each other.

The flow meter 20 measures the flow rate of the fuel in the bypass pipelines 133A to 133C in a state where the fuel is not supplied to the fueled feeder by the fuel supply machines 12A to 12C. The flow meter 20 is, for example, a minute flow meter capable of measuring a flow rate due to a minute flow of fuel due to fuel leakage. Further, the flow meter 20 may be able to detect the direction of the fuel flow in the individual pipeline 132.

The flow meter 20 includes flow meters 20A to 20C.

The flow meter 20A (an example of the flow direction detecting device) is provided on the upstream side of the solenoid valve 16A in the bypass pipeline 133A. As a result, the flow meter 20A can measure the flow rate of fuel between the shared line 131 (branch line 131A) and the individual line 132A through the bypass line 133A. The flow meter 20A 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. The flow measurement may include information about the direction of the flow. For example, the measured value of the flow meter may be represented by a positive value in the case of a flow toward the downstream side, and may be represented by a negative value in the case of a flow toward the upstream side. Further, the measurement signal may include data indicating the flow direction in addition to the data of the measured value.

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) in the 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 having a base station as an end. Further, the wide area network may include, for example, a satellite communication network that uses a communication satellite. Further, the wide area network may include, for example, an Internet network. Further, the predetermined communication line may include, for example, a wireless short-range communication line. The short-range communication line may include, for example, a communication line according to the Bluetooth (registered trademark) standard and a communication line according to the WiFi standard. Hereinafter, the same may apply to the communication line between the flow meters 20B and 20C and the fuel leak detection device 30.

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

The flow meter 20B (an example of the flow direction detecting device) is provided on the upstream side of the solenoid valve 16B in the bypass pipeline 133B. As a result, the flow meter 20B can measure the flow rate of fuel between the shared pipe 131 (branch pipe 131B) and the individual pipe 132B through the bypass pipe 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.

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

The flow meter 20C (an example of the flow direction detecting device) is provided on the upstream side of the solenoid valve 16C in the bypass pipeline 133C. As a result, the flow meter 20C can measure the flow rate of fuel between the shared line 131 (branch line 131C) and the individual line 132C through the bypass line 133C. The flow meter 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 in the vicinity of the solenoid valve 15C.

The fuel leak detection device 30 detects a fuel leak in the fuel supply system 10 (fuel supply pipeline 13) and determines a fuel leak location.

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

The function of the fuel leak detection device 30 may be realized by any hardware, or a combination of any 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 an external input / output device. It is mainly composed of interface devices and the like. 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 the auxiliary storage device into the memory device and executing the program on the CPU.

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

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

[First example of a method for determining a 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.

<Overview>
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 line 131 (in this example, the main line 131M) on the upstream side of the flow meters 20A to 20C in the fuel supply line 13. It is a figure which shows the integrated value (hereinafter, "integrated flow rate") and the flow direction of the flow rate of the fuel flowing to the installation place of the total 20A to 20C. Further, FIG. 3 shows a case where fuel leaks on the downstream side (in this example, the individual flow meter 132A) of one flow meter 20X (in this example, the flow meter 20A) in the fuel supply line 13. It is a figure which shows the integrated flow rate and the flow direction of the fuel which flows to the installation place of the flow meter 20A to 20C. Further, in FIG. 4, fuel leaks on the downstream side (in this example, individual pipelines 132A, 132C) of the two flowmeters 20X (in this example, the flowmeters 20A and 20C) in the fuel supply pipeline 13. It is a figure which shows the integrated flow rate and the flow direction of the fuel which flows to the installation place of the flow meter 20A to 20C in the case of. Hereinafter, in this example, the description will be made on the premise that the fuel supply units 12A to 12C do not supply fuel to the fueled body.

2 to 4 show branch lines 131A to 131C when the presence or absence of fuel leakage in the fuel supply line 13 is detected, that is, when the solenoid valves 15A to 15C are closed and the solenoid valves 16A to 16C are closed. And the portions of the individual pipelines 132A to 132C are simply represented. Specifically, in FIGS. 2 to 4, the notation of the bypass pipeline 133X is omitted, the pipeline portion on the upstream side of the flow meter 20X is described as the branch pipeline 131X, and the downstream side of the flow meter 20X. The pipeline portion is described as an individual pipeline 132X. In this case, the bypass pipeline 133X may be excluded from the target of detection of the presence or absence of fuel leakage as described above, and the upstream side and downstream side pipeline portions based on the flow meter 20X are branch pipes, respectively. It may be included in the subject in the form of being included in the road 131X and the individual pipeline 132X. Hereinafter, the same applies to the cases of FIGS. 6 and 7 described later.

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

As shown in FIGS. 2 to 4, a case where a fuel leak occurs at an arbitrary position in the fuel supply line 13 will be examined.

If fuel is not supplied to the fueled object by the fuel supply units 12A to 12C and there is no fuel leakage in the fuel supply line 13, the fuel inside the fuel supply line 13 is on the upstream side. It does not flow to the downstream side, and is in a substantially stationary state.

On the other hand, when a fuel leak occurs in the fuel supply line 13, the fuel inside the fuel supply line 13 flows toward the fuel leak point. Therefore, as shown in FIGS. 2 to 4, fuel flows toward the leaked portion even at the installation location of the flow meters 20A to 20C. Therefore, the leak detection unit 302 can determine that fuel leakage has occurred in the fuel supply line 13 when fuel is flowing at the installation points of the flow meters 20A to 20C.

For example, the leak detection unit 302 may determine that a fuel leak has occurred in the fuel supply pipeline 13 when all the measured values of the flow meters 20A to 20C are at least the threshold value Th11. Further, for example, the leak detection unit 302 states that fuel leakage has occurred in the fuel supply line 13 when at least a part of the measured values of the flow meters 20A to 20C is at or above the threshold value Th11. You may judge. That is, the leak detection unit 302 may determine that fuel leakage has occurred in the fuel supply line 13 when the measured value of at least one flow meter 20X of the flow meters 20A to 20C is the threshold value Th11 or more. .. The threshold value Th11 (an example of the first threshold value) is set in advance as a lower limit value at which the leakage detection unit 302 can determine in advance that fuel is flowing due to fuel leakage to the installation locations of the flow meters 20A to 20C through experiments and simulations. Is stipulated. Further, the threshold value Th11 is predetermined to be a value larger than the flow rate measured by the flow meters 20A to 20C due to, for example, vibration transmitted from the surroundings. The vibration transmitted from the surroundings to the fuel supply pipeline 13 includes, for example, vibration caused by running the train when the target of fuel supply (fueled body) by the fuel supply system 10 is a train. As a result, the leak detection unit 302 can distinguish between fuel leakage and vibration transmitted to the fuel supply pipeline 13 by using the threshold value Th11, and can suppress erroneous detection of fuel leakage.

In addition, the leak detection unit 302 is a value obtained by integrating the measured values of the flow meters of the flow meters 20A to 20C in a predetermined period as in the case of determining the leak location described later (hereinafter, “integrated flow rate measurement value” for convenience). Based on the above, it may be determined whether or not a fuel leak has occurred in the fuel supply line 13. Specifically, when the measured value of at least one flow meter 20X among the flow meters 20A to 20C is equal to or higher than a predetermined threshold value, the leak detection unit 302 causes a fuel leak in the fuel supply line 13. It may be determined that there is.

Further, as shown in FIG. 2, a case where a fuel leak occurs in the shared pipeline 131 on the upstream side of the flow meters 20A to 20C in the fuel supply pipeline 13 will be examined.

In this case, at the installation location of the flow meters 20A to 20C, the fuel inside the individual pipelines 132A, 132B, 132C flows from the downstream side to the upstream side. Therefore, it can be considered that the integrated flow rate passing through the respective installation locations of the flow meters 20A to 20C due to the fuel leakage of the shared pipeline 131 is substantially equal to the internal capacity of each of the individual pipelines 132A, 132B, 132C. .. The internal capacity of each of the individual pipelines 132A, 132B, 132C can be grasped in advance from, for example, design data. Therefore, in the leak detection unit 302, the difference between the integrated flow rates at the installation locations of the flow meters 20A to 20C is substantially the same as the difference between the internal capacities of the individual pipelines 132A, 132B, and 132C. In this case, it can be determined that a fuel leak has occurred in the shared pipeline 131. In particular, in a situation where the internal capacities of the individual pipelines 132A, 132B, 132C are substantially the same, the leak detection unit 302 is a shared pipe when the integrated flow rates at the installation locations of the flow meters 20A to 20C are all substantially the same. It can be determined that a fuel leak has occurred on the road 131.

For example, when the difference between the values obtained by integrating the measured values of the flow meters 20A to 20C (integrated flow rate measured values) is equal to or less than a predetermined threshold value Th12, the leak detection unit 302 fuels the shared pipeline 131. It may be determined that a leak has occurred. The threshold value Th12 (an example of the second threshold value) is, for example, the integrated flow rate at the installation location of the flow meters 20A to 20C, which is assumed from the difference between the internal capacities of the individual pipelines 132A, 132B, and 132C. It is predetermined as the upper limit of the difference between them. Further, the threshold value Th12 may be, for example, the maximum value of the mutual difference in the capacity in the pipeline between the flow meter 20X and the fuel supply machine 12X (supply valve) in each of the individual pipelines 132A to 132C.

Further, as shown in FIGS. 3 and 4, fuel leakage has occurred in the individual pipeline 132X on the downstream side of some of the flow meters 20A to 20C in the fuel supply pipeline 13. Consider the case.

In this case, of the flow meters 20A to 20C, the shared pipeline 131 is installed at the flow meter 20X (flow meter 20A in FIG. 3 and flow meters 20A and 20C in FIG. 4) in which fuel leakage occurs on the downstream side. Fuel flows from the upstream side to the downstream side. Further, the shared pipeline 131 has a sufficiently larger capacity than the individual pipeline 132X on the downstream side of the flow meter 20X. Therefore, among the flow meters 20A to 20C, the integrated flow rate of the fuel passing through the installation location of the flow meter 20X where the fuel leak occurs on the downstream side becomes relatively large.

On the other hand, of the flowmeters 20A to 20C, at the location where the flowmeter 20X (flowmeters 20B and 20C in FIG. 3 and the flowmeter 20B in FIG. 4) in which fuel leakage does not occur on the downstream side is installed, it is downstream of the flowmeter 20X. The fuel of the individual pipeline 132X on the side flows out toward the shared pipeline 131. Then, the spilled fuel passes through the shared pipeline 131 to the leakage point on the downstream side (individual pipeline 132X) of the flow meter 20X where the fuel leak occurs on the downstream side of the flow meters 20A to 20C. It flows in. Further, the internal capacity of the downstream portion (individual pipeline 132X) of the installation location of the flow meters 20A to 20C is sufficiently smaller than the internal capacity of the shared pipeline 131. Therefore, among the flow meters 20A to 20C, the integrated flow rate of the fuel passing through the installation location of the flow meter 20X in which fuel leakage does not occur on the downstream side is relatively small.

Therefore, when the integrated flow rate measurement value of one flow meter 20X among the flow meters 20A to 20C is sufficiently larger than the integrated flow rate measurement value of the other flow meter 20X, the leak detection unit 302 of one flow meter 20X. It can be determined that a fuel leak has occurred in the individual pipeline 132X on the downstream side.

For example, when the leak detection unit 302 has the integrated flow rate measurement value of one of the flow meters 20A to 20C of the flow meter 20X equal to or more than the value obtained by adding the threshold Th13 to the integrated flow rate measurement value of the other flow meter 20X. It may be determined that a fuel leak has occurred in the downstream portion of one flow meter 20X. The threshold value Th13 (an example of the third threshold value) is, for example, a difference in the lengths of the pipes constituting the shared pipe line 131 and the individual pipe lines 132A to 132C, that is, using the design data of the fuel supply pipe line 13. It is defined in advance by considering the difference between the internal capacities of each pipe. Further, the threshold value Th13 is set between the installation location of the flow meter 20X in which fuel leakage occurs on the downstream side and the installation location of the flow meter 20X in which fuel leakage does not occur on the downstream side, for example, through experiments and simulations. It may be predetermined as the lower limit of the difference in the accumulated flow rates that occur. Further, the threshold value Th13 is larger than the threshold value Th12. This is because the difference in internal capacity between the shared pipeline 131 and each of the individual pipelines 132A, 132B, 132C is sufficiently larger than the difference between the internal capacities of the individual pipelines 132A, 132B, 132C. be.

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 pipeline 13) based on the relative comparison of the integrated flow rate measurement values for each of the flow meters 20A to 20C ( Can be specified).

<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, “fuel leak detection process”).

This flowchart starts, for example, when a request signal for detecting a fuel leak is received by the fuel leak detecting device 30. The request signal for detecting fuel leakage may be output, for example, in response to a predetermined input from the user. Further, the request signal for detecting fuel leakage may be automatically output at a predetermined timing, for example, during a time period when the fuel supply devices 12A to 12C are not used (for example, in the middle of the night). Further, at the time of executing this flowchart, the solenoid valves 14A to 14C are opened, the solenoid valves 15A to 15C are closed, and the solenoid valves 16A to 16C are opened, as described above. Further, at the start of this flowchart, the solenoid valves 14A to 14C, the solenoid valves 15A to 15C, and the solenoid valves 16A to 16C may be switched to the above states in response to a control command from the fuel leak detection device 30. Further, when this flowchart is executed, even if the fuel supply machines 12A to 12C are controlled to be in an unusable state, or a notification indicating that the fuel supply machines 12A to 12C is unusable is displayed on the display of the fuel supply machines 12A to 12C. good. Hereinafter, the same may apply to the case of the flowchart of FIG. 8 described later.

As shown in FIG. 5, in step S102, the leak detection unit 302 determines whether or not the measured value αi (i = 1, 2, 3) of the flow meters 20A to 20C is the threshold value Th11 or more. The measured values α1 to α3 represent the measured values of the flow rates of the flow meters 20A to 20C, respectively. Specifically, as described above, the leak detection unit 302 may determine whether or not the measured value of at least one flow meter 20X among the flow meters 20A to 20C is the threshold value Th11 or more. When the measured value of at least one flow meter 20X of the flow meters 20A to 20C is equal to or higher than the threshold value Th11, the leak detection unit 302 determines that a fuel leak has occurred in the fuel supply line 13, and proceeds to step S104. .. On the other hand, when the measured values of the flow meters 20A to 20C are not equal to or higher than the threshold value Th11, the leak detection unit 302 determines that no fuel leak has occurred in the fuel supply pipeline 13, and ends the processing of the current flowchart. ..

In step S102, the leak detection unit 302 may determine whether or not all the measured values of the flow meters 20A to 20C are at or above the threshold value Th11, as described above.

In step S104, in the leak detection unit 302, all of the mutual differences | βj-βk | (j ≠ k) of the integrated flow rate measurement values βi (i = 1, 2, 3) for each of the flow meters 20A to 20C are threshold values Th12. It is determined whether or not it is as follows. The integrated flow rate measurement values β1 to β3 represent the integrated flow rate measurement values of the flow meters 20A to 20C, respectively. Specifically, the leak detection unit 302 calculates the mutual difference | βj-βk | for all combinations of the two flowmeters 20X among the flowmeters 20A to 20C, and whether all of them are the threshold value Th12 or more. It may be determined whether or not. The leak detection unit 302 proceeds to step S106 when all of the mutual differences | βj-βk | of the integrated flow rate measurement values βi for each flow meter 20A to 20C are equal to or less than the threshold value Th12, and proceeds to step S108 in other cases. ..

In step S106, the leak detection unit 302 determines that there is a fuel leak location in the shared pipeline 131, and records a log indicating that fact in the 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, in the leak detection unit 302, the integrated flow rate measurement value βj of one of the flow meters 20A to 20C of the flow meter 20X adds the threshold value Th13 to the integrated flow rate measurement value βk of the other flow meter 20X. It is determined whether or not the value is equal to or greater than the specified value. Then, the leak detection unit 302 is a combination of all the flowmeters 20X of the two flowmeters 20A to 20C (specifically, a combination of the flowmeters 20A and 20B, a combination of the flowmeters 20A and 20C, and a flowmeter. The above determination is sequentially performed for the combination of 20B and 20C). The leak detection unit 302 proceeds to step S110 if at least one combination of one flow meter 20X and another flow meter 20X satisfying the above conditions exists, and proceeds to step S112 if it does not exist.

In step S110, the leak detection unit 302 determines that there is a fuel leak point in the individual pipeline 132X on the downstream side of the flow meter 20X, which is one of the combinations satisfying the above conditions, and indicates that fact. Record the log in an auxiliary storage device or the like.

When the process of step S110 is completed, the fuel leak detection device 30 ends the process of the current flowchart.

On the other hand, in step S112, the leak detection unit 302 determines that the fuel leak location cannot be determined, and records a log indicating that fact in the 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.

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

<Action>
As described above, in this example, the fuel leak detection device 30 is a fuel supply pipe based on the measurement results of the respective flow rates of the plurality of flow meters 20X in a state where the fuel is not supplied by the plurality of fuel supply machines 12X. The fuel leakage point is determined from the shared pipe 131 of the road 13 and the plurality of individual pipes 132X.

As a result, the fuel leak detection device 30 determines the fuel leak location from the shared pipeline 131 and the plurality of individual pipelines 132X even if the shared pipeline 131 is not provided with a sensor capable of detecting the fuel leak. can do. Therefore, the fuel leak detection device 30 can realize the detection of the fuel leak for each of the shared pipeline 131 and the plurality of individual pipelines 132X with a smaller number of sensors (flow meter 20X). Therefore, the overall cost of the fuel leak detection system 1 can be suppressed.

Further, in this example, in the fuel leak detection device 30, the measured value of at least one flow meter 20X among the plurality of flow meters 20X is the threshold Th11 in a state where the fuel is not supplied by the plurality of fuel supply machines 12X. When the above is the above and the difference between the integrated flow rate measurement values for each of the plurality of flow meters 20X is the threshold Th12 or less, it may be determined that fuel leakage has occurred in the shared pipeline 131.

As a result, the fuel leak detection device 30 can specifically determine the fuel leak in the shared pipeline 131 even if the shared pipeline 131 is not provided with a sensor capable of detecting the fuel leak.

Further, in this example, in the fuel leak detection device 30, the measured value of at least one flow meter 20X among the plurality of flow meters 20X is the threshold Th11 in a state where the fuel is not supplied by the plurality of fuel supply machines 12X. When the above is the above and the difference between the integrated flow rate measurement values for each of the plurality of flow meters 20X exceeds the threshold Th12, it may be determined that fuel leakage has occurred in the plurality of individual pipelines 132X.

As a result, in the fuel leak detection device 30, even if the shared pipeline 131 is not provided with a sensor capable of detecting the fuel leak, the fuel leak location is specifically the shared pipeline 131 or the shared pipeline 131. Other than (that is, a plurality of individual pipelines 132X) can be determined.

Further, in this example, in the fuel leak detection device 30, the measured value of at least one flow meter 20X among the plurality of flow meters 20X is a threshold value in a state where the fuel is not supplied by the plurality of fuel supply machines 12X. Th11 or more, and the integrated flow rate measurement value of one of the plurality of flowmeters 20X is the value obtained by adding the threshold Th13 larger than the threshold Th12 to the integrated flow rate measurement value of the other flowmeters 20X. In some cases, it may be determined that fuel leakage has occurred in the individual pipeline 132X on the downstream side of one flow meter 20X.

As a result, in the fuel leak detection device 30, even if the shared pipeline 131 is not provided with a sensor capable of detecting the fuel leak, the fuel leak location is specifically the shared pipeline 131 including the shared pipeline 131. It can be determined whether it is a specific individual pipeline 132X.

In the case of this example (first example), the flow meters 20A to 20C may have specifications that cannot detect the flow direction. Hereinafter, the same may apply to the cases of the second example and the third example described later.

[Second example of the method for determining the location of fuel leakage]
Next, a second 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 and 6.

FIG. 6 is a diagram illustrating a method for determining a fuel leak location. Specifically, FIG. 6 shows the flow meters 20A to 20C when fuel is leaking on all downstream sides (individual lines 132A, 132B, 132C) of the flow meters 20A to 20C in the fuel supply line 13. It is a figure which shows the integrated flow rate and the direction of flow of the fuel which flows to the installation place of 20C.

As shown in FIG. 2, a case where a fuel leak occurs in the shared pipeline 131 on the upstream side of the flow meters 20A to 20C in the fuel supply pipeline 13 will be examined.

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

For example, the leak detection unit 302 may determine that fuel leakage has occurred in the shared pipeline 131 when the integrated flow rate measurement values of the flow meters 20A to 20C are equal to or less than a predetermined threshold value Th21. The threshold value Th21 is, for example, a value obtained by adding a predetermined margin to the upper limit value of the integrated flow rate of the fuel passing when a fuel leak occurs on the downstream side of the flow meters 20A to 20C through an experiment or a simulation. good.

Further, as shown in FIGS. 3, 4, and 6, a case where fuel leakage occurs on the downstream side of a part or all of the flow meters 20A to 20C will be examined.

In this case, of the flow meters 20A to 20C, fuel flows from the shared pipeline 131 to the individual pipeline 132X at the installation location of the flow meter 20X where fuel leakage occurs on the downstream side. Therefore, the integrated flow rate of the fuel passing through the installation location of the flow meter 20X where the fuel leak occurs on the downstream side is larger than the case where the fuel flows out from the individual pipeline 132X to the shared pipeline 131 (branch pipeline 131X). It will be big enough. Therefore, in the leak detection unit 302, when the integrated flow rate of the fuel passing through the installation location of the flow meter 20X is sufficiently larger than the case where the fuel flows out from the individual pipeline 132X to the shared pipeline 131 (branch pipeline 131X). It can be determined that fuel leakage has occurred in the individual pipeline 132X on the downstream side of the flow meter 20X.

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

As described above, in this example, the fuel leak detection device 30 determines (specifies) the fuel leak location in the fuel supply system 10 (fuel supply pipeline 13) based on the absolute value of the integrated flow rate measurement value of the flow meter 20X. be able to.

[Third example of the method for determining the 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.

FIG. 7 shows both the shared pipe 131 (in this example, the main pipe 131M) and the individual pipe 132X (in this example, the individual pipe 132A downstream of the flow meter 20A) in the fuel supply pipe 13. It is a figure which shows the integrated flow | concentration flow | flow direction of the fuel which flows to the installation place of the flow meter 20A to 20C when the fuel is leaking.

As shown in FIG. 7, a case where fuel leakage occurs in both the shared pipeline 131 and the individual pipeline 132X (individual pipeline 132A) will be examined.

In this case, the fuel in the shared pipeline 131 flows into the individual pipeline 132A and leaks to the outside from the leaked portion of the main pipeline 131M. Therefore, as shown in FIG. 3, when there is a fuel leakage point only in the individual pipeline 132X (individual pipeline 132A), the integrated flow rate of the fuel flowing into the individual pipeline 132X from the shared pipeline 131 decreases. .. Therefore, in the leak detection unit 302, the integrated flow rate of the fuel passing through the installation location of the flow meter 20X where the fuel leakage has occurred on the downstream side is estimated when the fuel leakage has not occurred in the shared pipeline 131. If it is smaller than the flow rate, it can be determined that fuel leakage has occurred even in the shared pipeline 131.

Whether or not fuel leakage has occurred on the downstream side of the flow meter 20X may be determined by using the determination methods of the first and second examples described above.

For example, the leak detection unit 302 determines that fuel leakage has also occurred in the shared pipeline 131 when the integrated flow rate measurement value of the flow meter 20X in which fuel leakage has occurred on the downstream side is equal to or less than a predetermined threshold value Th31. You may judge. The threshold value Th31 is, for example, the lower limit of the integrated flow rate of the fuel passing through the installation location of the flow meter 20X where the fuel leak occurs on the downstream side when the fuel leak does not occur in the shared pipeline 131 through experiments and simulations. Is preset as. Further, the threshold value Th31 is variable according to the number of individual pipelines 132X in which fuel leakage has occurred among the individual pipelines 132A, 132B, and 132C. Specifically, the threshold value Th31 is set so as to increase as the number of individual pipelines 132X in which fuel leakage occurs among the individual pipelines 132A, 132B, 132C increases. As shown in FIGS. 3, 4, and 6, as the number of individual pipelines 132X in which fuel leakage occurs among the individual pipelines 132A, 132B, and 132C increases, the number of individual pipelines 132X from the shared pipeline 131X increases. This is because the integrated flow rate of the fuel flowing into the water is reduced.

As described above, in this example, when the fuel leak is generated in the downstream portion (individual pipeline 132X) of the flow meter 20X, the fuel leak detection device 30 is combined with the fuel leak in the shared pipeline 131. Can be determined whether or not is occurring.

[Fourth example of the method for determining the location of fuel leakage]
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, 6 and 8.

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

As described above, when a fuel leak occurs in the fuel supply line 13, the fuel inside the fuel supply line 13 flows toward the fuel leak point. Therefore, as shown in FIGS. 2 to 4 and 6, fuel flows toward the leaked portion even at the installation location of the flow meters 20A to 20C. Therefore, the leak detection unit 302 can determine that fuel leakage has occurred in the fuel supply line 13 when fuel is flowing at the installation points of the flow meters 20A to 20C.

For example, the leak detection unit 302 may determine that a fuel leak has occurred in the fuel supply pipeline 13 when the fuel is flowing at all the installation locations of the flow meters 20A to 20C. Further, the leak detection unit 302 may determine that a fuel leak has occurred in the fuel supply pipeline 13 when a fuel flow has occurred in at least a part of the installation location of the flow meter 20X. That is, the leak detection unit 302 determines that a fuel leak has occurred in the fuel supply pipeline 13 when the 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 where a fuel leak occurs in the shared pipeline 131 on the upstream side of the flow meters 20A to 20C in the fuel supply pipeline 13 will be examined.

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

Further, as shown in FIGS. 3, 4, and 6, a case where a fuel leak occurs on the downstream side (individual pipeline 132X) of a part or all of the flow meters 20A to 20C will be examined.

In this case, fuel flows from the upstream side to the downstream side at the installation location of the flow meter 20X where the fuel leak occurs on the downstream side. Therefore, the leak detection unit 302 detects the flow from the upstream side to the downstream side when part or all of the fuel flow direction detected by the flow meters 20A to 20C is from the upstream side to the downstream side. It may be determined that fuel leakage has occurred in the individual pipeline 132X on the downstream side of the flow meter 20X.

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

As shown in FIG. 8, in step S202, the leak detection unit 302 determines whether or not the fuel flow is detected by the flow meters 20A to 20C regardless of the direction. Specifically, the leak detection unit 302 may determine whether or not the fuel flow is detected by at least one flow meter 20X among the flow meters 20A to 20C as described above. When the leak detection unit 302 detects the fuel flow by at least one flow meter 20X among the flow meters 20A to 20C, the leak detection unit 302 determines that a fuel leak has occurred in the fuel supply pipeline 13, and proceeds to step S204. move on. On the other hand, when the fuel flow is not detected in all of the flow meters 20A to 20C, the leak detection unit 302 determines that no fuel leak has occurred in the fuel supply pipeline 13, and ends the processing of this flowchart. do.

In step S204, the leak detection unit 302 proceeds to step S206 when the flow from the downstream side to the upstream side is detected by all the flow meters 20A to 20C. On the other hand, when the leak detection unit 302 detects a flow from the upstream side to the downstream side in part or all of the flow meters 20A to 20C, the leak detection unit 302 proceeds to step S208.

In step S206, the leak detection unit 302 determines that there is a fuel leak location in the shared pipeline 131, and records a log indicating that fact in the auxiliary storage device or the like.

When the process of step S206 is completed, the fuel leak detection device 30 ends the process of the current flowchart.

On the other hand, in step S208, the leak detection unit 302 determines that there is a leak point in the individual pipeline 132X on the downstream side of the flow meter 20X in which the flow from the upstream side to the downstream side is detected, and a log indicating that fact. Is recorded in an auxiliary storage device or the like.

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

<Action>
As described above, in this example, the fuel leak detection device 30 is based on the detection result of the fuel flow direction by each of the plurality of flow meters 20X in a state where the fuel is not supplied by the plurality of fuel supply machines 12X. A fuel leak location is determined from the shared pipeline 131 of the fuel supply pipeline 13 and the plurality of individual pipelines 132X.

As a result, the fuel leak detection device 30 determines the fuel leak location from the shared pipeline 131 and the plurality of individual pipelines 132X even if the shared pipeline 131 is not provided with a sensor capable of detecting the fuel leak. can do. Therefore, the fuel leak detection device 30 can realize the detection of the fuel leak for each of the shared pipeline 131 and the plurality of individual pipelines 132X with a smaller number of sensors (flow meter 20X). Therefore, the overall cost of the fuel leak detection system 1 can be suppressed.

Further, in this example, in the fuel leak detection device 30, the fuel flow is detected by at least one flow meter 20X of the plurality of flow meters 20X, and the fuel flow is detected by all of the plurality of flow meters 20X from the downstream side to the upstream side. When the flow in the direction is detected, it may be determined that fuel leakage has occurred in the shared pipeline 131.

As a result, the fuel leak detection device 30 can specifically determine the fuel leak in the shared pipeline 131 even if the shared pipeline 131 is not provided with a sensor capable of detecting the fuel leak.

Further, in this example, the fuel leak detection device 30 is downstream of one flow meter 20X when the flow of fuel from the upstream side to the downstream side is detected by the flow meter 20X of one of the plurality of flow meters 20X. It may be determined that fuel leakage has occurred in the individual pipeline 132X on the side.

As a result, in the fuel leak detection device 30, even if the shared pipeline 131 is not provided with a sensor capable of detecting the fuel leak, the fuel leak location is specifically the shared pipeline 131 or the individual pipeline 132X. Can be determined.

In this example, the flow meters 20A to 20C may be replaced with a predetermined device (an example of the flow direction detecting device) capable of detecting only the direction of the fuel flow.

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

For example, in the above-described embodiment, a part or all of the above-mentioned first to third examples may be combined with the above-mentioned fourth example. That is, in the above-described embodiment, the fuel leak detection device 30 may determine the fuel leak location in the fuel supply line 13 based on both the flow rate measurement result by the flow meter 20X and the flow direction detection result. good.

Further, in the above-described embodiment, the fuel leakage location of the fuel supply line 13 is determined using the integrated flow rate measurement value of the flow meter 20X, but the fuel flow continues at the installation location of the flow meter 20X. It may be determined by the length of time (hereinafter, "flow duration"). The flow duration may be the duration during which the flow meter 20X continuously outputs measured values larger than zero. Further, the duration may be such that the flow meter 20X as the flow direction detecting device continues to detect the flow of fuel. It is considered that the flow rate of the fuel generated by the fuel leak does not change so much due to the change of the leak location, and the larger the integrated flow rate, the longer the flow duration. Therefore, the fuel leak detection device 30 can determine the leak location by using the flow duration, as in the case of using the integrated flow rate. For example, when determining which of the individual pipelines 132X among the plurality of individual pipelines 132X has a fuel leak, the flow rate is not measured by one flow meter 20X (flow rate ≈ 0). If the flow rate larger than zero is continuously measured by the other flow meter 20X, it may be determined that fuel leakage has occurred in the individual pipeline 132X downstream of the other flow meter 20X. Specifically, in one individual pipeline 132X where fuel leakage occurs, the integrated flow rate of fuel flowing inside is larger than that of the other individual pipeline 132X, and the flow rate of the flow meter 20X is larger than zero by that amount. It also takes longer to measure. Therefore, when one flow meter 20X continuously measures a flow rate larger than zero for a longer time than the other flow meters 20X, the fuel leak detection device 30 is an individual pipe on the downstream side of the one flow meter 20X. It can be determined that a fuel leak has occurred on the road 132X.

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

Claims (7)

Multiple fuel supply machines that supply fuel to the fueled object, and
A fuel supply pipe including a shared pipeline for sending fuel from a fuel supply source to the plurality of fuel feeders, and a plurality of individual pipelines connecting the shared pipeline and each of the plurality of fuel feeders. The road and
A plurality of flow meters provided at the connection points between the shared pipeline and each of the plurality of individual pipelines to measure the flow rate of fuel, and a plurality of flow meters.
In a state where fuel is not supplied by the plurality of fuel supply machines, the shared pipeline and the plurality of individual pipes among the fuel supply pipelines are based on the measurement results of the flow rates of the plurality of flow meters. It is equipped with a fuel leak determination device that determines the location of fuel leakage from the road.
Fuel leak detection system. In the fuel leakage determination device, the difference between the values measured by at least one of the plurality of flow meters is equal to or higher than the first threshold value and the measured values of the plurality of flow meters are integrated. If it is equal to or less than the second threshold value, it is determined that fuel leakage has occurred in the shared pipeline.
The fuel leak detection system according to claim 1. In the fuel leakage determination device, the difference between the measured values of at least one of the plurality of flow meters is equal to or higher than the first threshold value and the integrated values of the measured values of the plurality of flow meters is the first. If the threshold value of 2 is exceeded, it is determined that leakage has occurred in the plurality of individual pipelines.
The fuel leak detection system according to claim 2. In the fuel leakage determination device, the 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. When the value is equal to or greater than the value obtained by adding the third threshold value larger than the second threshold value to the integrated value of the measured values of the other flow meters, the flow meter of the one of the plurality of individual pipelines. Judge that fuel leakage has occurred in the individual pipeline on the downstream side,
The fuel leak detection system according to claim 2 or 3. Multiple fuel supply machines that supply fuel to the fueled object, and
A fuel supply pipe including a shared pipeline for sending fuel from a fuel supply source to the plurality of fuel feeders, and a plurality of individual pipelines connecting the shared pipeline and each of the plurality of fuel feeders. The road and
A plurality of flow direction detecting devices provided at the connection points between the shared pipeline and each of the plurality of individual pipelines to detect the fuel flow direction, and
In a state where fuel is not supplied by the plurality of fuel supply machines, the shared pipeline among the fuel supply pipelines is based on the detection result of the fuel flow direction by each of the plurality of flow direction detection devices. And a fuel leak determination device for determining a fuel leak location from the plurality of individual pipelines.
Fuel leak detection system. A plurality of fuel feeders that supply fuel to the fueled object, a shared pipeline that sends fuel from the fuel supply source to the plurality of fuel feeders, and the shared pipeline and the plurality of fuel feeders. A fuel leak detection device that detects a fuel leak in a fuel supply system having a fuel supply pipeline including a plurality of individual pipelines connecting to each other.
An acquisition unit for acquiring the measurement results of a plurality of flow meters for measuring the flow rate of fuel, which are provided at the connection points between the shared pipeline and each of the plurality of individual pipelines.
In a state where fuel is not supplied by the plurality of fuel supply machines, the shared pipeline among the fuel supply pipelines and the plurality of individual pipes are based on the measurement results of the flow rates of the plurality of flow meters. It is equipped with a determination unit for determining the location of fuel leakage from the pipeline.
Fuel leak detector. A plurality of fuel feeders that supply fuel to the fueled object, a shared pipeline that sends fuel from the fuel supply source to the plurality of fuel feeders, and the shared pipeline and the plurality of fuel feeders. A fuel leak detection device that detects a fuel leak in a fuel supply system having a fuel supply pipeline including a plurality of individual pipelines connecting to each other.
An acquisition unit for acquiring the detection results of a plurality of flow direction detection devices for detecting the fuel flow direction provided at the connection points between the shared pipeline and each of the plurality of individual pipelines.
In a state where fuel is not supplied by the plurality of fuel supply machines, the shared pipeline among the fuel supply pipelines is based on the detection result of the fuel flow direction by each of the plurality of flow direction detection devices. And a determination unit for determining a fuel leak location from the plurality of individual pipelines.
Fuel leak detector.

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