KR20230032443A - Hydrogen fuel tank internal inspection system and inspection method - Google Patents

Abstract

The present invention relates to a hydrogen fuel tank leakage inspection system and method, the system comprising a hydrogen fuel tank including a housing having a hollow inside to be filled with hydrogen gas; a pair of ultrasonic sensors coupled to the outer circumferential surface of the hydrogen fuel tank and arranged to face each other; and a control unit connected to the ultrasonic sensors and analyzing an actual measured waveform of an ultrasonic signal passing through the inside of the hydrogen fuel tank, wherein the control unit compares the actual measured waveform with a preset safety waveform to determine whether there is leakage in the hydrogen fuel tank so that a detailed inspection of the hydrogen fuel tank can be performed in a vehicle-mounted state, thereby improving efficiency.

Description

Hydrogen fuel tank leak inspection system and inspection method {HYDROGEN FUEL TANK INTERNAL INSPECTION SYSTEM AND INSPECTION METHOD}

The present invention relates to a hydrogen fuel tank leakage inspection system and inspection method, and more particularly, to an apparatus and method for inspecting leakage of gas contained inside a hydrogen fuel tank to the outside.

Hydrogen is an element with the most advanced atomic number among substances in the natural world, and hydrogen fuel has the advantage that it can be used as an energy source that is close to infinite and does not emit environmental pollutants. Accordingly, hydrogen is in the limelight as a next-generation clean fuel that can prepare for the depletion of petroleum. However, since hydrogen fuel is light in gaseous state and has the largest variation in volume expansion, storage and transportation are not easy. In addition, there is a risk that hydrogen fuel may explode when it meets and reacts with oxygen introduced from the outside. Accordingly, hydrogen fuel has disadvantages that are difficult to be widely used due to the above problems. In addition, hydrogen fuel has a disadvantage that the amount received can be measured only using a pressure sensor, such as natural gas (NG) or compressed natural gas (CNG).

As shown in FIG. 1, a conventional technology for measuring the internal pressure of a hydrogen fuel tank includes a regulator 1, multiple layers 2, and a plurality of pressure sensors 3. At this time, the regulator 1 regulates the inflow and outflow and pressure of hydrogen, the multiple layers 2 form the inner wall of the tank, and the internal pressure of the hydrogen fuel tank is measured through the plurality of pressure sensors 3 on the inner wall. It may be configured to measure the degree of expansion as an electrical signal or resistance value and convert it into data. At this time, when hydrogen is stored in the hydrogen fuel tank, damage to the pressure sensor may occur frequently as the pressure is measured under a high compression condition. Therefore, in the conventional hydrogen fuel tank, the pressure sensor 3 is inserted into the thickness between the inside and outside of the tank housing, and since a plurality of pressure sensors 3 are placed, measurement can be continued through the remaining part even if a part is damaged.

However, as described above, since the hydrogen fuel tank measures the pressure under a high compression condition, the pressure sensor has a high frequency of breakage, and since the pressure sensor is inserted into multiple layers, there is a limit in that the sensor cannot be replaced. In addition, when all of the inserted pressure sensors are out of order, the hydrogen fuel tank has to be discarded. In addition, the price of the pressure sensor inserted inside the hydrogen fuel tank is usually high, which is an obstacle to the mass production system of hydrogen vehicles. This can lead to aggravated problems.

KR 10-2155575 B1 (2020.09.08.)

The present invention has been made to solve the problems of the prior art, and an object of the present invention is to inspect the leakage of a hydrogen fuel tank in a state where the hydrogen fuel tank is mounted on a vehicle, using a non-destructive inspection method using an ultrasonic sensor for leakage of a hydrogen fuel tank. To provide an inspection system and inspection method.

A hydrogen fuel tank leak inspection system according to the present invention for achieving the above object is a hydrogen fuel tank including a housing with a hollow interior to be filled with hydrogen gas; a pair of ultrasonic sensors coupled to the outer circumferential surface of the hydrogen fuel tank and arranged to face each other; and a control unit that is connected to the ultrasonic sensor and analyzes an actually measured waveform of an ultrasonic signal passing through the inside of the hydrogen fuel tank, wherein the control unit compares the actually measured waveform with a preset safety waveform to generate the hydrogen fuel. It is possible to determine whether there is a leak in the tank.

In addition, the ultrasonic sensor may be detachably coupled to an outer circumferential surface of the housing.

In addition, the hydrogen fuel tank leak inspection system according to the present invention may further include a position adjusting unit for adjusting the ultrasonic sensor to be located on the outer circumferential surface of the housing.

In addition, the hydrogen fuel tank leak inspection system according to the present invention may further include a fixing part connected to the position adjusting part and formed in a shape in which one end faces the outer circumferential surface of the housing.

In addition, the hydrogen fuel tank leak inspection system according to the present invention includes a gap adjusting unit for adjusting the gap between the position adjusting unit and the fixing unit; And a height control unit for adjusting the height of the position control unit or the fixing unit; may further include.

In addition, the hydrogen fuel tank leak inspection system according to the present invention includes a first displacement sensor for measuring the distance between the position adjusting unit and the fixing unit; and a second displacement sensor for measuring a height of the position adjusting unit or the fixing unit based on the housing.

Also, the ultrasonic sensor may be embedded in the housing.

Also, the controller may be connected to the fixed ultrasonic sensor through a cable.

In addition, the hydrogen fuel tank leak inspection system according to the present invention, the hydrogen fuel tank is mounted on a vehicle, the test bed on which the vehicle is seated; and a shielding unit disposed inside the vehicle and examination bed to block transmission of vibrations from the outside to the inside.

In addition, a hydrogen fuel tank leakage inspection method according to an embodiment of the present invention for achieving the above object includes a hydrogen fuel charging step of charging hydrogen fuel to the housing of the hydrogen fuel tank to a test pressure; an ultrasonic sensor arrangement step of attaching a pair of the ultrasonic sensors to an outer circumferential surface of the housing; a first inspection step in which the control unit controls a transmission signal of one ultrasonic sensor and receives a reception signal of another ultrasonic sensor; and a second inspection step in which the control unit compares the actually measured waveform of the received signal with a preset safety waveform to determine whether or not there is leakage in the hydrogen fuel tank.

In addition, a hydrogen fuel tank leakage inspection method according to another embodiment of the present invention for achieving the above object includes a hydrogen fuel charging step of charging hydrogen fuel to the housing of the hydrogen fuel tank to a test pressure; A connection step of connecting the control unit and the pair of ultrasonic sensors; a first inspection step in which the control unit controls a transmission signal of one ultrasonic sensor and receives a reception signal of another ultrasonic sensor; and a second inspection step in which the control unit compares the actually measured waveform of the received signal with a preset safety waveform to determine whether or not there is leakage in the hydrogen fuel tank.

The hydrogen fuel tank leakage inspection system and inspection method according to the present invention having the above configuration can use a pair of ultrasonic sensors to determine whether or not there is leakage in the housing, so that the hydrogen fuel tank can be used for a longer period of time, while Compatibility with existing technologies increases the reliability of performance, which can lead to the advantage of preventing safety accidents in advance.

In addition, the hydrogen fuel tank leakage inspection system and inspection method according to the present invention can perform a leakage inspection in a situation where the hydrogen fuel tank is mounted on a vehicle, so that the disassembly of the hydrogen fuel tank in use is omitted and more hydrogen is obtained in a short time. It has the advantage of being able to inspect the fuel tank.

1 is a cutaway perspective view of a hydrogen fuel tank according to the prior art of the present invention.
2 is a view showing a hydrogen fuel tank leak inspection system according to the present invention.
3 is a perspective view of a hydrogen fuel tank according to the present invention;
4 to 6 are side cross-sectional views of a hydrogen fuel tank according to the present invention.
7 and 8 are front cross-sectional views of a hydrogen fuel tank according to the present invention.
9 is a view showing a vehicle to which an ultrasonic sensor according to the present invention is fixed;
10 is a flow chart of a hydrogen fuel tank leak inspection method according to an embodiment of the present invention.
11 is a flow chart of a hydrogen fuel tank leak inspection method according to another embodiment of the present invention.
12 is a flow chart of a hydrogen fuel tank leak inspection method according to another embodiment of the present invention.

Hereinafter, a hydrogen fuel tank leak inspection system and inspection method according to the present invention will be described in detail with reference to the accompanying drawings. The drawings introduced below are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Therefore, the present invention may be embodied in other forms without being limited to the drawings presented below. Also, like reference numbers indicate like elements throughout the specification.

Unless otherwise defined, the technical terms and scientific terms used at this time have meanings commonly understood by those of ordinary skill in the art to which this invention belongs, and the gist of the present invention is unnecessary in the following description and accompanying drawings. Descriptions of well-known functions and configurations that may be obscure are omitted.

2 and 3 relate to a hydrogen fuel tank leak inspection system according to the present invention, FIG. 2 is a configuration diagram showing the hydrogen fuel tank leak inspection system, and FIG. 3 shows a perspective view of the hydrogen fuel tank, respectively.

2 and 3, the hydrogen fuel tank leak inspection system according to the present invention includes a hydrogen fuel tank 10 filled with hydrogen gas, an ultrasonic sensor 100 coupled to the hydrogen fuel tank 10, and It may include a control unit 200 connected to the ultrasonic sensor 100 through a cable C to transmit and receive signals. And, in the water show fuel tank leak inspection system according to the present invention, the test can be performed in a state where the hydrogen fuel tank 10 is mounted on the vehicle 20, and the test bed 310 on which the vehicle 20 is seated. ), and a shield 300 disposed inside the vehicle 20 to block transmission of vibration from the outside to the inside. Here, the ultrasonic sensors 100 may be configured as a pair, so that one ultrasonic sensor 100 transmits ultrasonic waves and the other ultrasonic sensor 100 receives ultrasonic waves. In addition, a plurality of hydrogen fuel tanks 10 may be disposed in the vehicle 20, and the hydrogen fuel tanks 10 may include valves connected to the outside to receive or discharge hydrogen gas.

4 to 6 relate to a hydrogen fuel tank leak inspection system according to the present invention, and FIGS. 4 to 6 each show side cross-sectional views of a hydrogen fuel tank in which the position of an ultrasonic sensor is adjusted.

Referring to FIGS. 4-(a) and 4-(b), a pair of ultrasonic sensors 100 may be detachably coupled to the outer surface of the housing 11 of the hydrogen fuel tank 10. At this time, the hydrogen fuel tank leak inspection system according to the present invention may further include a position adjusting unit for adjusting the position of the ultrasonic sensor 100, and the position adjusting unit also consists of a pair of ultrasonic sensors 100. ), the first position adjusting unit 410 and the second position adjusting unit 420 may be respectively connected. Here, as the pair of ultrasonic sensors 100 are arranged to face each other around the hollow of the housing 11, ultrasonic waves are transmitted from one ultrasonic sensor 100 to the other ultrasonic sensor 100. can be configured to

The ultrasonic sensor 100 may include a sensor body 110 and a sensing unit 120. In one ultrasonic sensor 100, the sensing unit 120 is formed as a transmitter to transmit ultrasonic waves, and in the other ultrasonic sensor 100, the sensing unit 120 is formed as a receiver to transmit ultrasonic waves. can receive At this time, the first position adjusting unit 410 and the second position adjusting unit 420 may be connected to the sensor body 110 of the pair of ultrasonic sensors 100, respectively. And, the first position adjusting unit 410 and the second position adjusting unit 420 control the pair of ultrasonic sensors 100 to be attached while being spaced apart from the outer surface of the housing 11 to the outside. Alternatively, it may be adjusted so that the attached ultrasonic sensor 100 is spaced outward. In addition, the ultrasonic sensor 100 may further include an elastic member 130 fixed on the sensor body 110, and the sensing unit 120 and the elastic member 130 are based on the sensor body 110. ) may be configured to protrude in the same direction, so that the device may be prevented from being damaged when in close contact.

The hydrogen fuel tank leak inspection system according to the present invention may further include a fixing part 430 for fixing the housing 11 of the hydrogen fuel tank 10 . At this time, an adhesion member 431 formed to correspond to the shape of the outer surface of the housing 11 may be disposed at one end of the fixing part 430 . Accordingly, the fixing part 430 moves up and down so that the contact member 431 can fix the posture of the housing 11 .

Referring to FIG. 5, the hydrogen fuel tank leakage inspection system according to the present invention is between the first position adjusting unit 410 and the fixing unit 430 or between the second position adjusting unit 420 and the fixing unit ( 430), and may further include a height adjusting unit for adjusting the heights of the ultrasonic sensor 100 and the contact member 431. More specifically, the hydrogen fuel tank leak inspection system according to the present invention includes a first distance adjusting unit 441 for adjusting the distance between the first position adjusting unit 410 and the fixing unit 430, the second A second spacing adjusting unit 442 for adjusting the distance between the position adjusting unit 420 and the fixing unit 430, a first height adjusting unit 451 for adjusting the height of one of the ultrasonic sensors 100, A second height adjusting unit 452 for adjusting the height of the other ultrasonic sensor 100 and a third height adjusting unit 453 for adjusting the height of the contact member 431 may be included.

The hydrogen fuel tank leak inspection system according to the present invention includes a first guide rod 440 connecting the first position adjusting unit 410 and the second position adjusting unit 420, and the first position adjusting unit 410. ), and a second guide rod 450 connecting the second position adjusting unit 420 and the fixing unit 430 to each other. At this time, the first distance adjusting part 441 and the second distance adjusting part 442 are disposed on the first guide rod 440, so that the first position adjusting part 410 and the second position adjusting part 420 Spacing can be controlled. In addition, as the first height adjusting unit 451, the second height adjusting unit 452, and the third height adjusting unit 453 are disposed on the second guide rod 450, the first position adjusting unit 410 , the height of the second position adjusting unit 420 and the fixing unit 430 may be controlled. At this time, the housing 11 may extend left and right, and the first position adjusting part 410, the second position adjusting part 420, and the fixing part 430 may be extended in a height direction, and the The first guide rod 440 and the second guide rod 450 may be extended in the front-back direction.

Referring to FIG. 6, the hydrogen fuel tank leakage inspection system according to the present invention is located between the first position adjusting unit 410 and the fixing unit 430 or between the second position adjusting unit 420 and the fixing unit 430. It may further include a first displacement sensor for measuring the distance between them. When the first displacement sensors are configured as a pair, the 1-1 displacement sensor 510 measuring the distance between the first position adjusting unit 410 and the fixing unit 430 and the second position adjusting unit A first-second displacement sensor 520 for measuring a distance between the 420 and the fixing part 430 may be included. In addition, the hydrogen fuel tank leakage inspection system according to the present invention measures the height of the first position adjusting unit 410, the second position adjusting unit 420, or the fixing unit 430 with respect to the housing 11. A second displacement sensor may be further included. At this time, the second displacement sensor is composed of a plurality including the 2-1 displacement sensor 530 and the 2-2 displacement sensor 540, and the first position adjusting unit 410 and the second position adjusting unit ( 420) or the height of each of the fixing parts 430 may be measured.

7 to 9 relate to a hydrogen fuel tank leak inspection system according to the present invention, FIGS. 7 and 8 are front cross-sectional views of a hydrogen fuel tank showing that an ultrasonic sensor and a control unit are connected, and FIG. 9 is a fixed ultrasonic sensor Each of the drawings showing the vehicle is shown.

Referring to FIGS. 7 and 8 , in the hydrogen fuel tank leak inspection system according to the present invention, the ultrasonic sensor 100 may be formed integrally with the hydrogen fuel tank 10 and buried instead of being detachable. A connector is formed in the embedded ultrasonic sensor 100, and as the cable C is connected, it may be connected to the control unit 200. At this time, the connector of the ultrasonic sensor 100 may be deformed into a shape configured to extend to the outer surface of the vehicle so that the operator can more conveniently connect the cable C.

As described above, the hydrogen fuel tank leak inspection system according to the present invention connects to the ultrasonic sensor 100 from the outside of the vehicle 20 to perform an inspection of the hydrogen fuel tank 10, or as shown in FIG. As described above, the ultrasonic sensor 100 is shipped to be fixed on the hydrogen fuel tank 10, but the ultrasonic sensor 100 is connected to the ECU (Electronic Control Unit) of the vehicle 20 so that the driver does not visit a separate facility. It may also be configured to enable on-site diagnosis of the hydrogen fuel tank 10 without any

10 relates to a hydrogen fuel tank leakage inspection method according to an embodiment of the present invention, and FIG. 10 shows a flowchart of the hydrogen fuel tank leakage inspection method.

Referring to FIG. 10, the hydrogen fuel tank leakage inspection method according to an embodiment of the present invention includes a hydrogen fuel charging step of charging hydrogen fuel to the housing of the hydrogen fuel tank to a test pressure, and a pair of leaks on the outer circumferential surface of the housing. An ultrasonic sensor arrangement step of attaching the ultrasonic sensor, a first inspection step in which the controller controls a transmission signal of one ultrasonic sensor and receives a received signal of another ultrasonic sensor, and the controller controls the received signal A second inspection step of determining whether or not there is a leak in the hydrogen fuel tank by comparing the actually measured waveform (W _R ) and the preset safety waveform (W _O ) may be included.

The hydrogen fuel charging step compares the actual pressure (P _R ) of the gas injected into the hydrogen fuel tank with the reference pressure ( _PO ), and when the environment is created equal to or higher than the reference pressure ( _PO ), the ultrasonic sensor arrangement step can lead to In the ultrasonic sensor arrangement step, a pair of ultrasonic sensors may be brought into close contact with the outer surface of the housing of the hydrogen fuel tank.

In the first inspection step, the control unit inputs an ultrasonic transmission signal to one ultrasonic sensor in which a transmitter is disposed and controls ultrasonic waves to be transmitted, and the control unit receives ultrasonic waves from another ultrasonic sensor in which a receiver is disposed. signal can be received. And, in the second inspection step, the controller may analyze the actually measured waveform (W _R ) based on the input ultrasonic transmission signal and the received ultrasonic reception signal, and the actual pressure (P _R ) or the reference pressure ( It is possible to determine whether or not there is leakage of the hydrogen fuel tank through comparison with the safety waveform (W _O ) calculated through P _O ). At this time, as a result of the determination of the control unit, when it is determined that the hydrogen fuel tank is leaking, a detailed inspection may be performed, and in the detailed inspection, an additional detailed inspection such as a liquid tightness test may be performed. In addition, when the actual measurement waveform (W _R ) is located in the range of the safety waveform (W _O ), the pressure condition is changed and the same hydrogen fuel tank is re-measured, or another hydrogen fuel tank is measured again, or , other vehicles may be inspected.

11 relates to a hydrogen fuel tank leakage inspection method according to another embodiment of the present invention, and FIG. 11 shows a flowchart of the hydrogen fuel tank leakage inspection method.

Referring to FIG. 11, a hydrogen fuel tank leakage inspection method according to another embodiment of the present invention includes a hydrogen fuel charging step of charging hydrogen fuel to the housing of the hydrogen fuel tank to a test pressure, the controller and a pair of ultrasonic waves. A connection step of connecting sensors, a first inspection step in which the control unit controls a transmission signal of one ultrasonic sensor and receives a received signal of another ultrasonic sensor, and a real measurement waveform of the received signal by the control unit A second inspection step of determining whether or not there is a leak in the hydrogen fuel tank by comparing (W _R ) and a preset safety waveform (W _O ) may be included.

The hydrogen fuel charging step compares the actual pressure (P _R ) of the gas injected into the hydrogen fuel tank with the reference pressure ( _PO ), and when the environment is created equal to or higher than the reference pressure ( _PO ), the ultrasonic sensor arrangement step can lead to In the ultrasonic sensor arranging step, the control unit and the pair of ultrasonic sensors may be respectively connected through cables.

In the first inspection step, the control unit inputs an ultrasonic transmission signal to one ultrasonic sensor in which a transmitter is disposed and controls ultrasonic waves to be transmitted, and the control unit receives ultrasonic waves from another ultrasonic sensor in which a receiver is disposed. signal can be received. And, in the second inspection step, the controller may analyze the actually measured waveform (W _R ) based on the input ultrasonic transmission signal and the received ultrasonic reception signal, and the actual pressure (P _R ) or the reference pressure ( It is possible to determine whether or not there is leakage of the hydrogen fuel tank through comparison with the safety waveform (W _O ) calculated through P _O ). At this time, as a result of the determination of the control unit, when it is determined that the hydrogen fuel tank is leaking, a detailed inspection may be performed, and in the detailed inspection, an additional detailed inspection such as a liquid tightness test may be performed. In addition, when the actual measurement waveform (W _R ) is located in the range of the safety waveform (W _O ), the pressure condition is changed and the same hydrogen fuel tank is re-measured, or another hydrogen fuel tank is measured again, or , other vehicles may be inspected.

12 relates to a hydrogen fuel tank leakage inspection method according to another embodiment of the present invention, and FIG. 12 shows a flow chart of the hydrogen fuel tank leakage inspection method.

Referring to FIG. 12, a hydrogen fuel tank leakage inspection method according to another embodiment of the present invention, in a state where the ultrasonic sensor is fixed on a hydrogen fuel tank installed inside a vehicle, without a driver visiting a separate facility. It can be configured to enable on-site diagnosis. At this time, the hydrogen fuel tank leakage test method may include an engine non-operation step in which the driver presses a button associated with the on-site diagnosis function or the test may be started according to a given diagnosis time, and the engine operation is stopped after the test starts. . At this time, in the engine non-operation step, the next step may be performed when the non-operation time _TR is greater than the preset stabilization reference time T _O in consideration of stabilization of the engine in operation.

The hydrogen fuel tank leakage inspection method may include an inspection step and an analysis step after the engine non-operation step. At this time, in the inspection step, the inside of the hydrogen fuel tank may be measured using a pair of ultrasonic sensors fixed on the housing of the hydrogen fuel tank by inputting a control signal to the ultrasonic sensor from the ECU of the vehicle. Here, one ultrasonic sensor may transmit a signal and the other ultrasonic sensor may receive a signal passing through the inside of the hydrogen fuel tank. Subsequently, in the analysis step, the signal output through the pair of ultrasonic sensors is calculated as an actual measured waveform (W _R ) and compared with a preset safety waveform (W _O ) to determine whether or not there is a leak in the hydrogen fuel tank. there is. At this time, when the actually measured waveform (W _R ) is within the range of the safety waveform (W _O ), it may be output to inform the driver that it is in a normal state, or there may be no separate guidance. In addition, when the actually measured waveform (W _R ) deviates from the safety waveform (W _O ), a warning may be given to the driver to inform the driver of the abnormal state through various means. It can also be passed through.

As described above, the present invention has been described with specific details such as specific components and limited embodiment drawings, but this is only provided to help a more general understanding of the present invention, and the present invention is not limited to the above one embodiment. No, and those skilled in the art to which the present invention pertains can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and it can be said that not only the claims described later, but also all modifications equivalent or equivalent to these claims fall within the scope of the spirit of the present invention. will be.

10: hydrogen fuel tank 11: housing
20: vehicle
100: ultrasonic sensor 110: sensor body
120: sensing unit 120a: transmitter
120b: Water Breaker 130: Elastic Member
200: control unit
300: shield 310: test bed
410: first position adjusting unit 420: second position adjusting unit
430: fixing part 431: adhesion member
440: first guide rod 441: first gap adjusting unit
442: second spacing control unit
450: second guide rod 451: first height adjustment unit
452: second height adjustment unit 453: third height adjustment unit
510: 1-1 displacement sensor 520: 1-2 displacement sensor
530: 2-1 displacement sensor 540: 2-2 displacement sensor

Claims (11)

A hydrogen fuel tank including a housing with a hollow inside to be filled with hydrogen gas;
a pair of ultrasonic sensors coupled to the outer circumferential surface of the hydrogen fuel tank and arranged to face each other; and
a control unit that is connected to the ultrasonic sensor and analyzes an actually measured waveform of an ultrasonic signal passing through the inside of the hydrogen fuel tank;
including,
the control unit,
The hydrogen fuel tank leakage inspection system, characterized in that for determining the presence or absence of leakage of the hydrogen fuel tank by comparing the actually measured waveform with a preset safety waveform.
According to claim 1,
The ultrasonic sensor,
Hydrogen fuel tank leak inspection system, characterized in that detachably coupled to the outer circumferential surface of the housing.
According to claim 2,
a positioning unit adjusting the ultrasonic sensor to be located on an outer circumferential surface of the housing;
Hydrogen fuel tank leak inspection system, characterized in that it further comprises.
According to claim 3,
a fixing part connected to the position adjusting part and having one end facing the outer circumferential surface of the housing;
Hydrogen fuel tank leak inspection system, characterized in that it further comprises.
According to claim 4,
a spacing adjusting unit for adjusting the spacing between the position adjusting unit and the fixing unit; and
a height adjusting unit for adjusting the height of the position adjusting unit or the fixing unit;
Hydrogen fuel tank leak inspection system, characterized in that it further comprises.
According to claim 5,
a first displacement sensor measuring a distance between the position adjusting unit and the fixing unit; and
a second displacement sensor measuring a height of the position adjusting unit or the fixing unit based on the housing;
Hydrogen fuel tank leak inspection system, characterized in that it further comprises.
According to claim 1,
The ultrasonic sensor,
Hydrogen fuel tank leak inspection system, characterized in that buried in the housing.
According to claim 7,
The control unit is a hydrogen fuel tank leak inspection system, characterized in that connected to the fixed ultrasonic sensor through a cable.
According to claim 1,
The hydrogen fuel tank is mounted on the vehicle,
an inspection bed on which the vehicle is seated; and
a shielding unit disposed inside the vehicle and test bed to block transmission of vibration from the outside to the inside;
Hydrogen fuel tank leak inspection system, characterized in that it further comprises.
In the hydrogen fuel tank leakage inspection method using the hydrogen fuel tank leakage inspection system according to any one of claims 2 to 6,
a hydrogen fuel charging step of charging hydrogen fuel up to a test pressure in the housing of the hydrogen fuel tank;
an ultrasonic sensor arrangement step of attaching a pair of the ultrasonic sensors to an outer circumferential surface of the housing;
a first inspection step in which the control unit controls a transmission signal of one ultrasonic sensor and receives a reception signal of another ultrasonic sensor; and
a second inspection step in which the control unit compares an actual measurement waveform of the received signal with a preset safety waveform to determine whether or not there is a leak in the hydrogen fuel tank;
Hydrogen fuel tank leakage inspection method comprising a.
In the hydrogen fuel tank leakage inspection method using the hydrogen fuel tank leakage inspection system of claim 7 or 8,
a hydrogen fuel charging step of charging hydrogen fuel up to a test pressure in the housing of the hydrogen fuel tank;
A connection step of connecting the control unit and the pair of ultrasonic sensors;
a first inspection step in which the controller controls a transmission signal of one ultrasonic sensor and receives a reception signal of another ultrasonic sensor; and
a second inspection step in which the control unit compares an actual measurement waveform of the received signal with a preset safety waveform to determine whether or not there is a leak in the hydrogen fuel tank;
Hydrogen fuel tank leakage inspection method comprising a.

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