CN218241902U - Hydrogen supply system of hydrogen fuel cell vehicle, hydrogen leakage detection device and vehicle - Google Patents
Hydrogen supply system of hydrogen fuel cell vehicle, hydrogen leakage detection device and vehicle Download PDFInfo
- Publication number
- CN218241902U CN218241902U CN202221617460.5U CN202221617460U CN218241902U CN 218241902 U CN218241902 U CN 218241902U CN 202221617460 U CN202221617460 U CN 202221617460U CN 218241902 U CN218241902 U CN 218241902U
- Authority
- CN
- China
- Prior art keywords
- hydrogen
- valve
- vehicle
- pressure
- fuel cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The utility model discloses a hydrogen fuel cell vehicle hydrogen supply system, hydrogen leak testing device and vehicle, hydrogen fuel cell vehicle hydrogen supply system includes the hydrogenation mouth that communicates in proper order through high-pressure line, the check valve, hydrogen storage bottle, bottle valve and relief pressure valve, and the hydrogen storage system solenoid valve that communicates in proper order through the middling pressure pipeline, fuel cell hydrogen advances the solenoid valve, fuel cell hydrogen advances proportional valve and pile, and set up the first filter on the high-pressure line between check valve and hydrogen storage bottle, the import of hydrogen storage system solenoid valve and the export of relief pressure valve are through middling pressure pipeline intercommunication. The hydrogen leakage detection device comprises a first mass flow meter and a second mass flow meter, wherein the first mass flow meter is used for detecting the mass of hydrogen entering a pressure reducing valve, and the second mass flow meter is used for detecting the mass of the hydrogen entering a galvanic pile. The hydrogen leakage detection device can detect whether hydrogen leakage exists in the vehicle in real time when the vehicle runs, has high hydrogen leakage detection precision, and can ensure the safety of the vehicle during running.
Description
Technical Field
The utility model relates to the field of vehicle technology, especially, relate to a hydrogen fuel cell vehicle hydrogen supply system, hydrogen leak testing device and vehicle.
Background
The hydrogen fuel cell vehicle mainly stores hydrogen in a high-pressure gaseous state, and because hydrogen has the characteristics of flammability, explosiveness, very small molecular weight and the like, the hydrogen fuel cell vehicle is easy to leak hydrogen, which affects the safety of drivers and passengers, and therefore, the detection of hydrogen leakage of the hydrogen fuel cell vehicle is very important. In the prior art, hydrogen leakage detection of a hydrogen fuel cell vehicle has two modes, the first mode is to perform pressure maintaining test in a shutdown state, form a closed space by closing each electromagnetic valve, detect the pressure in the closed space, and judge whether hydrogen leakage exists or not through pressure change. But this method requires a shutdown operation. The second method is that in a starting state, hydrogen concentration sensors arranged in each potential leakage area detect the hydrogen concentration in the air to judge whether hydrogen leakage exists, however, the arrangement of the hydrogen concentration sensors is limited due to the fact that the number of connection points of a vehicle hydrogen pipeline is large and the arrangement of parts is scattered, hydrogen leakage in partial areas cannot be monitored, and in the case of good ventilation conditions, the hydrogen concentration sensors cannot well reflect the real hydrogen leakage condition, so that the detection accuracy of the hydrogen leakage is poor, and the safety of the vehicle in operation cannot be fully guaranteed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydrogen fuel cell vehicle hydrogen system, hydrogen leak testing device and vehicle to solve among the prior art hydrogen fuel cell vehicle hydrogen leak testing mode, hydrogen leak testing precision is poor, the problem of the security when can't fully guarantee the vehicle operation.
To achieve the purpose, the utility model adopts the following technical proposal:
a hydrogen fuel cell vehicle hydrogen supply system comprising: the hydrogen storage system comprises a hydrogenation port, a one-way valve, a hydrogen storage bottle, a bottle valve and a pressure reducing valve which are sequentially communicated through a high-pressure pipeline, and a hydrogen storage system electromagnetic valve, a fuel cell hydrogen inlet proportional valve and an electric pile which are sequentially communicated through a medium-pressure pipeline, wherein an inlet of the hydrogen storage system electromagnetic valve is communicated with an outlet of the pressure reducing valve through the medium-pressure pipeline; the hydrogen supply system for the hydrogen fuel cell vehicle is characterized by further comprising a first filter, wherein the first filter is arranged on a high-pressure pipeline between the one-way valve and the hydrogen storage bottle.
As a preferable mode of the hydrogen supply system for a hydrogen fuel cell vehicle, the hydrogen supply system further includes a second filter, and the second filter is disposed on the high-pressure pipeline between the cylinder valve and the pressure reducing valve.
A hydrogen leak detection device for detecting the hydrogen supply system of the hydrogen fuel cell vehicle described above, the hydrogen leak detection device comprising:
a first mass flow meter for detecting the mass of hydrogen entering the pressure reducing valve;
a second mass flow meter for detecting the mass of hydrogen entering the stack.
As a preferable scheme of the hydrogen leakage detection device, the hydrogen leakage detection device further includes a controller, the first mass flow meter and the second mass flow meter are both electrically connected to the controller, and the controller is electrically connected to the vehicle control unit.
As a preferable aspect of the hydrogen leakage detection device, the hydrogen leakage detection device further includes a gateway and a meter, the gateway is electrically connected to the controller, and the gateway is electrically connected to the meter.
As a preferable aspect of the hydrogen leak detection device, the meter is provided with an alarm.
As a preferable mode of the hydrogen leakage detection device, the gateway is connected to the controller through a CAN signal line, and the gateway is connected to the meter through a CAN signal line.
As a preferable mode of the hydrogen leakage detection device, the hydrogen leakage detection device further includes a first pressure sensor for detecting a pressure in a high-pressure pipe between the cylinder valve and the pressure reducing valve.
As a preferable aspect of the above hydrogen leakage detection apparatus, the hydrogen leakage detection apparatus further includes a second pressure sensor for detecting a pressure in a medium-pressure pipeline between the pressure reducing valve and the electromagnetic valve of the hydrogen storage system.
A vehicle includes the hydrogen leak detection device.
The utility model has the advantages that:
the utility model provides a hydrogen fuel cell vehicle hydrogen supply system, hydrogen leak detection device and vehicle, this hydrogen leak detection device are provided with first mass flow meter and second mass flow meter, and first mass flow meter is used for detecting the quality of the hydrogen that gets into the relief pressure valve, and second mass flow meter is used for detecting the quality of the hydrogen that gets into the pile. Two methods are used for detecting whether the hydrogen leakage exists in the vehicle by using the hydrogen leakage detection device, one method is that after the whole vehicle is electrified and the vehicle starts to run and the hydrogen flow is stable, the real-time quality Q of the hydrogen entering the pressure reducing valve is detected in real time through the first mass flow meter and the second mass flow meter 1 And the real-time quality Q of the hydrogen entering the stack 2 According to the real-time quality Q of the hydrogen entering the stack 2 With real-time quality Q of hydrogen entering the pressure reducing valve 1 Difference (Q) of 2 -Q 1 ) And judging whether the vehicle has hydrogen leakage. The other method is that after the whole vehicle is powered on, the vehicle starts to run and the hydrogen flow is stable, the accumulated mass Q of the hydrogen entering the pressure reducing valve within the set time t is detected by the first mass flowmeter 3 Detecting the accumulated mass Q of hydrogen entering the galvanic pile in the set time t through a second mass flowmeter 4 By hydrogen entering the stackCumulative mass Q 4 And the cumulative mass Q of hydrogen entering the pressure reducing valve 3 The difference of (a) is divided by the set time t to obtain the hydrogen leakage rate ((Q) 4 -Q 3 ) T) according to the hydrogen leakage rate ((Q) 4 -Q 3 ) T), judging whether the vehicle has hydrogen leakage. This hydrogen leakage detection device can be when the vehicle operation real-time detection vehicle whether have hydrogen to leak, and it is more accurate to obtain the hydrogen quality through calculating through first mass flow meter and second mass flow meter detection hydrogen quality ratio moreover, and hydrogen leaks the detection precision height, can guarantee the security when the vehicle operation.
Drawings
Fig. 1 is a schematic diagram of a hydrogen leakage detection device according to an embodiment of the present invention.
In the figure:
1. a hydrogenation port; 2. a one-way valve; 3. a hydrogen storage bottle; 4. a cylinder valve; 5. a pressure reducing valve; 6. a hydrogen storage system solenoid valve; 7. a fuel cell hydrogen inlet solenoid valve; 8. a fuel cell hydrogen inlet proportional valve; 9. a galvanic pile; 10. a first mass flow meter; 11. a second mass flow meter; 12. a controller; 13. a vehicle control unit; 14. a meter; 15. a first pressure sensor; 16. a second pressure sensor; 17. a first filter; 18. a second filter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The utility model provides a hydrogen supply system for hydrogen fuel cell vehicles, as shown in figure 1, the hydrogen supply system for hydrogen fuel cell vehicles comprises a hydrogen adding port 1, a one-way valve 2, a hydrogen storage bottle 3, a bottle valve 4 and a pressure reducing valve 5 which are sequentially communicated through a high-pressure pipeline, and a hydrogen storage system electromagnetic valve 6, a fuel cell hydrogen inlet electromagnetic valve 7, a fuel cell hydrogen inlet proportional valve 8 and a galvanic pile 9 which are sequentially communicated through a medium-pressure pipeline, wherein the inlet of the hydrogen storage system electromagnetic valve 6 is communicated with the outlet of the pressure reducing valve 5 through the medium-pressure pipeline; the hydrogen supply system of the hydrogen fuel cell vehicle further comprises a first filter 17, and the first filter 17 is arranged on the high-pressure pipeline between the one-way valve 2 and the hydrogen storage bottle 3. The first filter 17 can filter the hydrogen gas flowing from the hydrogen adding port 1 to the hydrogen storage cylinder 3. It is understood that the fuel cell hydrogen inlet solenoid valve 7 is a hydrogen inlet solenoid valve in the fuel cell, and the fuel cell hydrogen inlet proportional valve 8 is a hydrogen inlet proportional valve in the fuel cell.
Optionally, the hydrogen fuel cell vehicle hydrogen supply system further includes a second filter 18, and the second filter 18 is provided on the high-pressure line between the cylinder valve 4 and the pressure reducing valve 5. The second filter 18 serves to filter the hydrogen gas entering the pressure reducing valve 5 from the cylinder valve 4.
The utility model also provides a hydrogen leakage detection device for detect foretell hydrogen fuel cell vehicle hydrogen supply system, as shown in FIG. 1, this hydrogen leakage detection device includes first mass flow meter 10 and second mass flow meter 11, and first mass flow meter 10 is used for detecting the quality of the hydrogen that gets into relief pressure valve 5, and second mass flow meter 11 is used for detecting the quality of the hydrogen that gets into galvanic pile 9.
Two methods are used for detecting whether the hydrogen leakage exists in the vehicle by using the hydrogen leakage detection device, one method is that after the whole vehicle is electrified and the vehicle starts to run and the hydrogen flow is stable, the real-time quality Q of the hydrogen entering the pressure reducing valve 5 is detected in real time through the first mass flow meter 10 and the second mass flow meter 11 1 And the real-time quality Q of the hydrogen entering the cell stack 9 2 And determining the real-time quality Q of the hydrogen entering the galvanic pile 9 2 With the real-time quality Q of the hydrogen entering the pressure reducing valve 5 1 Difference (Q) of 2 -Q 1 ) If the mass of the hydrogen is larger than the set real-time mass of the hydrogen, hydrogen leakage exists in the vehicle, and a hydrogen supply system is closed; if not, the vehicle has no hydrogen leakage and continues to run. The other method is that after the whole vehicle is powered on, the vehicle starts to run and the hydrogen flow is stable, the accumulated mass Q of the hydrogen entering the pressure reducing valve 5 in the set time t is detected by the first mass flowmeter 10 3 The accumulated mass Q of hydrogen gas entering the cell stack 9 within the set time t is detected by the second mass flow meter 11 4 By the cumulative mass Q of hydrogen entering the cell stack 9 4 With the accumulated mass Q of hydrogen entering the pressure reducing valve 5 3 The difference of (a) is divided by the set time t to obtain the hydrogen leakage rate ((Q) 4 -Q 3 ) T), judging the hydrogen leakage rate ((Q) 4 -Q 3 ) Whether/t) is greater than a set hydrogen leak rate, if hydrogen leak rate ((Q) 4 -Q 3 ) If the/t) is larger than the set hydrogen leakage rate, the vehicle has hydrogen leakage, and the hydrogen supply system is closed; if hydrogen leakage rate ((Q) 4 -Q 3 ) And/t) is less than or equal to the set hydrogen leakage rate, the vehicle does not have hydrogen leakage, and the vehicle continues to run. This hydrogen leakage detection device can be when the vehicle operation real-time detection vehicle whether have hydrogen to leak, and it is more accurate to detect the hydrogen quality through first mass flow meter 10 and second mass flow meter 11 moreover than obtaining the hydrogen quality through calculating, and hydrogen leaks the detection precision height, can guarantee the security when the vehicle operation.
Optionally, the hydrogen leakage detection apparatus further includes a controller 12, the first mass flow meter 10 and the second mass flow meter 11 are both electrically connected to the controller 12, and the controller 12 is electrically connected to the vehicle control unit 13. The controller 12 is configured to receive and record the values detected by the first mass flow meter 10 and the second mass flow meter 11, determine whether the vehicle has hydrogen leakage according to the values detected by the first mass flow meter 10 and the second mass flow meter 11, and feed back the result to the vehicle control unit 13.
Optionally, the hydrogen leakage detection apparatus further comprises a gateway and a meter 14, the gateway is electrically connected with the controller 12, and the gateway is electrically connected with the meter 14. The controller 12 transmits the detection result to the meter 14 through the gateway, and the detection result is displayed on the meter 14.
Optionally, the meter 14 is provided with an alarm. If the controller 12 determines that there is a hydrogen leak in the vehicle, the alarm on the meter 14 will begin to alarm to notify the occupants of the vehicle that there is a hydrogen leak.
Alternatively, the gateway is connected to the controller 12 via a CAN signal line, and the gateway is connected to the meter 14 via a CAN signal line.
Optionally, the hydrogen leakage detecting device further includes a first pressure sensor 15, and the first pressure sensor 15 is configured to detect a pressure in the high-pressure line between the cylinder valve 4 and the pressure reducing valve 5. The first pressure sensor 15 is electrically connected to the controller 12.
Optionally, the hydrogen leakage detecting means further comprises a second pressure sensor 16, the second pressure sensor 16 being for detecting a pressure in the medium pressure line between the pressure reducing valve 5 and the hydrogen storage system solenoid valve 6. The second pressure sensors 16 are each electrically connected to the controller 12.
The utility model also provides a vehicle, including foretell hydrogen leakage detection device.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A hydrogen fuel cell vehicle hydrogen supply system comprising: the hydrogen storage device comprises a hydrogenation port (1), a one-way valve (2), a hydrogen storage bottle (3), a bottle valve (4) and a pressure reducing valve (5) which are sequentially communicated through a high-pressure pipeline, and a hydrogen storage system electromagnetic valve (6), a fuel cell hydrogen inlet electromagnetic valve (7), a fuel cell hydrogen inlet proportional valve (8) and an electric pile (9) which are sequentially communicated through a medium-pressure pipeline, wherein an inlet of the hydrogen storage system electromagnetic valve (6) is communicated with an outlet of the pressure reducing valve (5) through the medium-pressure pipeline; the hydrogen supply system of the hydrogen fuel cell vehicle is characterized by further comprising a first filter (17), wherein the first filter (17) is arranged on a high-pressure pipeline between the one-way valve (2) and the hydrogen storage bottle (3).
2. The hydrogen fuel cell vehicle hydrogen supply system according to claim 1, characterized by further comprising a second filter (18), the second filter (18) being provided on a high-pressure line between the cylinder valve (4) and the pressure reducing valve (5).
3. A hydrogen leak detection device for detecting the hydrogen fuel cell vehicle hydrogen supply system according to claim 1 or 2, characterized by comprising:
a first mass flow meter (10), the first mass flow meter (10) being for detecting the mass of hydrogen entering the pressure reducing valve (5);
a second mass flow meter (11), the second mass flow meter (11) being for detecting the mass of hydrogen entering the galvanic pile (9).
4. The hydrogen leak detection apparatus according to claim 3, further comprising a controller (12), wherein the first mass flow meter (10) and the second mass flow meter (11) are each electrically connected to the controller (12), and the controller (12) is electrically connected to a vehicle control unit (13).
5. The hydrogen leak detection apparatus according to claim 4, further comprising a gateway and a meter (14), the gateway being electrically connected to the controller (12), the gateway being electrically connected to the meter (14).
6. The hydrogen leak detection device according to claim 5, wherein the meter (14) is provided with an alarm.
7. The hydrogen leak detection device according to claim 5, wherein the gateway is connected to the controller (12) via a CAN signal line, and the gateway is connected to the meter (14) via a CAN signal line.
8. The hydrogen leak detection device according to claim 3, further comprising a first pressure sensor (15), the first pressure sensor (15) being configured to detect a pressure in a high-pressure line between the cylinder valve (4) and the pressure reducing valve (5).
9. The hydrogen leak detection device according to claim 3, further comprising a second pressure sensor (16), the second pressure sensor (16) being configured to detect a pressure in a medium-pressure line between the pressure reducing valve (5) and the hydrogen storage system solenoid valve (6).
10. A vehicle characterized by comprising the hydrogen leak detection device according to any one of claims 3 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221617460.5U CN218241902U (en) | 2022-06-27 | 2022-06-27 | Hydrogen supply system of hydrogen fuel cell vehicle, hydrogen leakage detection device and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221617460.5U CN218241902U (en) | 2022-06-27 | 2022-06-27 | Hydrogen supply system of hydrogen fuel cell vehicle, hydrogen leakage detection device and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218241902U true CN218241902U (en) | 2023-01-06 |
Family
ID=84673815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221617460.5U Active CN218241902U (en) | 2022-06-27 | 2022-06-27 | Hydrogen supply system of hydrogen fuel cell vehicle, hydrogen leakage detection device and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218241902U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115993207A (en) * | 2023-03-22 | 2023-04-21 | 北京理工大学 | Hydrogen leakage monitoring method and system for vehicle-mounted hydrogen system |
-
2022
- 2022-06-27 CN CN202221617460.5U patent/CN218241902U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115993207A (en) * | 2023-03-22 | 2023-04-21 | 北京理工大学 | Hydrogen leakage monitoring method and system for vehicle-mounted hydrogen system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102759434B (en) | The system and method that valve in diagnosis vehicle leaks | |
| US8770012B2 (en) | Fuel leakage detection system and detection method | |
| US20070051423A1 (en) | Pressure Differential System for Controlling High Pressure Refill Gas Flow Into On Board Vehicle Fuel Tanks | |
| CN218241902U (en) | Hydrogen supply system of hydrogen fuel cell vehicle, hydrogen leakage detection device and vehicle | |
| CN110661018B (en) | Method and system for detecting hydrogen leakage position of hydrogen fuel cell vehicle | |
| CN103748722A (en) | Method for checking the gas tightness of a fuel cell system | |
| CN111678658A (en) | Hydrogen leakage detection method and system for hydrogen fuel cell automobile and hydrogen fuel cell automobile | |
| CN113865798A (en) | Testing device and testing method for simulating hydrogen leakage detection of vehicle-mounted hydrogen system | |
| CN102889906A (en) | Single-pipe gas relay detecting bench, centering clamping mechanism and detection method thereof | |
| CN112748221A (en) | Method for detecting hydrogen leakage of whole vehicle by using light truck hydrogen fuel cell vehicle | |
| CN107146644B (en) | A kind of experimental rig of reactor pressure vessel level sensor functional verification | |
| CN110567657A (en) | Hydrogen leakage monitoring method for hydrogen energy locomotive | |
| CN114361531A (en) | Leakage detection system and method for vehicle-mounted fuel cell hydrogen system | |
| CN202836631U (en) | Single-pipe buchholz relay detecting platform and centring clamping mechanism special for buchholz relay detection | |
| CN208420321U (en) | Safety valve testing equipment | |
| CN211855513U (en) | Diaphragm type gas table calibrating installation | |
| CN114878084A (en) | Hydrogen energy vehicle hydrogen leakage detection method | |
| CN211576498U (en) | Hydrogen leakage detection device for hydrogen energy vehicle | |
| CN212159042U (en) | Flow resistance testing system for converter valve assembly | |
| CN202281677U (en) | Detecting device of self-exhaust medical liquid filter | |
| CN209198018U (en) | Locomotive depot's fuel delivery systems leakage alarm | |
| CN111579166A (en) | EVAP system fuel vapor leakage detection device | |
| US20200256756A1 (en) | Method and system for detecting a leak in a fluid system | |
| KR100721254B1 (en) | Method for detecting leak of fuel tank | |
| CN218002933U (en) | Detection device of hydrogenation machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |