Pressure-maintaining comprehensive performance test board for hydrogen fuel cell system

Abstract

The utility model relates to the technical field of hydrogen fuel cells, and discloses a hydrogen fuel cell system pressure-maintaining comprehensive performance test board, which comprises a test loop system, a master control system, an auxiliary controller system and a low-voltage power supply system, and the auxiliary controller system and the low-voltage power supply system are respectively connected with the test loop system. The main control system is connected with the auxiliary controller system, the test loop system comprises a large mass flow loop, a small mass flow loop and a test pipeline, the large mass flow loop and the small mass flow loop are connected in parallel and then are connected with the test pipeline, and the test pipeline is connected with a tested object. According to the utility model, air-tight seal test and leakage detection of a large mass flow loop and a small mass flow loop of a hydrogen fuel cell system can be satisfied, and installation requirements of mechanical interfaces, electrical interfaces and the like of different brands of hydrogen fuel cell systems can be satisfied.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen fuel cells, in particular to a pressure-maintaining comprehensive performance test bench for a hydrogen fuel cell system. Background Art

[0002] With the guidance of policy demands such as carbon peak, carbon neutrality, environmental protection and emission reduction, and increasing the proportion of clean energy use, the use of hydrogen energy and the development of hydrogen vehicles have become hot spots. Hydrogen fuel cells powered by hydrogen energy have many advantages such as a wide range of raw material sources, high energy conversion rate, low operating noise, simple structure and easy maintenance, zero emissions and no pollution. They are developing rapidly and have great potential, and have good commercial application value and industrial prospects.

[0003] When hydrogen fuel cells are used as a power source for automobiles, they are mainly composed of five subsystems: fuel cell stack, air supply system, hydrogen supply system, water heat management system, and electronic control system. The air supply system generally includes key components such as air filter, air compressor, turbine, intercooler, adjustment mechanism, throttle, and muffler. The hydrogen supply system generally includes key components such as high-pressure hydrogen storage tank, hydrogen injector, ejector, hydrogen circulation pump, moisture adjustment mechanism, and pressure reducing valve. The water heat management system generally includes key components such as expansion tank, electronic water pump, thermostat, intercooler, deionizer, PTC heater, and radiator. The sealing, safety, and reliability of each subsystem and the key components it contains play a vital role in the stable operation of the hydrogen fuel cell engine.

[0004] At present, the domestic hydrogen fuel cell system and its key components are mainly customized based on customer needs. Different companies have different design ideas and solutions, which are difficult to unify. Moreover, during the test, if there is a gas or liquid leak, it is very easy to damage the core components of the battery system, causing damage to equipment and personnel. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing hydrogen fuel cell system pressure maintenance test device is not universal and has high detection and manufacturing costs.

[0006] In order to solve the above technical problems, the technical solution of the utility model is to provide a hydrogen fuel cell system pressure maintenance comprehensive performance test bench, including a test loop system, a main control system, an auxiliary controller system and a low-voltage power supply system, wherein the auxiliary controller system and the low-voltage power supply system are respectively connected to the test loop system, and the main control system is connected to the auxiliary controller system, wherein:

[0007] The test loop system includes a large mass flow loop, a small mass flow loop and a test pipeline. The large mass flow loop and the small mass flow loop are connected to the test pipeline after being arranged in parallel, and the test pipeline is connected to the object to be tested.

[0008] The main control system includes control cabinet, test bench controller, main control computer, and control software, which are interconnected and controlled with the test loop system through CAN protocol;

[0009] The auxiliary controller system is used to control the start and stop of the equipment in the system;

[0010] The low-voltage power supply system is responsible for providing the required control power to each controller in the system.

[0011] By adopting the above technical scheme, the utility model sets a large mass flow loop and a small mass flow loop in the test loop system, which can meet the gas sealing test and leakage detection of the large mass flow loop of the fuel cell stack, air supply system, hydrogen supply system, and water thermal management system of the hydrogen fuel cell system; it can meet the gas sealing test and leakage detection of the small mass flow of key components in each subsystem, and is compatible with the installation requirements of mechanical interfaces, electrical interfaces, etc. of hydrogen fuel cell systems of different brands.

[0012] Optionally, it also includes an air pump and a pressure reducing valve, wherein the air pump outlet is connected to the pressure reducing valve, and the pressure reducing valve outlet is connected to a large mass flow loop and a small mass flow loop.

[0013] Optionally, the large mass flow loop includes a main inlet pipeline and a main outlet pipeline, the small mass flow loop includes an auxiliary inlet pipeline and an auxiliary outlet pipeline, and the test pipeline is provided with multiple ones, each including a test inlet pipeline and a test outlet pipeline, one end of the main inlet pipeline and the auxiliary inlet pipeline are connected to the pressure reducing valve, and the other end is connected to the test inlet pipeline, the object to be tested is connected to the test inlet pipeline through the object inlet pipe, and is connected to the test outlet pipeline through the object outlet pipe, and the outlet of the test outlet pipeline is respectively connected to the main outlet pipeline and the main outlet pipeline.

[0014] Optionally, a first pressure transmitter and a first solenoid valve are provided between the pressure reducing valve and the main inlet pipeline and the auxiliary inlet pipeline; a pressure transmitter, a mass flow meter and a solenoid valve are provided on the main inlet pipeline, the main outlet pipeline, the auxiliary inlet pipeline and the auxiliary outlet pipeline; a pressure transmitter and a solenoid valve are provided on the test inlet pipeline, and a solenoid valve is provided on the test outlet pipeline.

[0015] Optionally, the pressure transmitters on the main inlet pipeline, the main outlet pipeline, the auxiliary inlet pipeline and the auxiliary outlet pipeline are located on the inlet side of the solenoid valve, and the pressure transmitter on the test inlet pipeline is located on the outlet side of the solenoid valve.

[0016] Optionally, the mass flow meters on the main inlet pipeline and the auxiliary inlet pipeline are located on the inlet side of the solenoid valve, and the mass flow meters on the main outlet pipeline and the auxiliary outlet pipeline are located on the outlet side of the solenoid valve.

[0017] Optionally, the solenoid valve, the pressure transmitter, the flow meter and the pipeline are all connected by a ferrule type, and the air inlet pipe and the air outlet pipe of the object to be measured are long hoses, which are plug-in connected to the test pipeline and the object to be measured.

[0018] Optionally, a pressure relief solenoid valve is also connected to the outlet of the test outlet pipeline.

[0019] Optionally, a test bench cabinet is also included, wherein the test bench cabinet is arranged outside the test loop system and a pipe clamp is provided on the test bench cabinet.

[0020] In summary, the utility model has at least one of the following beneficial effects:

[0021] 1. The utility model sets a large mass flow loop and a small mass flow loop in the test loop system, which can meet the gas sealing test and leakage detection of the large mass flow loop of the fuel cell stack, air supply system, hydrogen supply system and water thermal management system of the hydrogen fuel cell system.

[0022] 2. The utility model can meet the requirements of small mass flow airtightness test and leakage detection of key components in each subsystem. With slight modifications to a small number of mechanical and electrical components, it can be compatible with the mechanical interface, electrical interface and other installation requirements of hydrogen fuel cell systems of different brands.

[0023] 3. The utility model can meet the air tightness test requirements of hydrogen fuel cell systems of different brands by adding or modifying the system and software slightly, and the control and detection interface remain consistent;

[0024] 4. The bench in the utility model can be used as a separate system for operation test, can be conveniently transported and even disassembled and assembled, and is convenient for later maintenance and function changes. The bench test, control, data acquisition and processing related software are open source to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure layout of the utility model;

[0026] Figure 2 This is a schematic diagram of the loop principle of the test loop system of the utility model;

[0027] Figure 3 This is a schematic diagram of the overall circuit structure of the utility model;

[0028] In the figure: 100, test loop system; 200, main control system; 300, auxiliary controller system; 400, low-voltage power supply system; 500, object to be tested; 600, test bench cabinet; 1, air pump; 2, first pressure transmitter; 3, second pressure transmitter; 4, third pressure transmitter; 5, fourth pressure transmitter; 6, fifth pressure transmitter; 7, sixth pressure transmitter; 8, seventh pressure transmitter; 9, eighth pressure transmitter; 10, first large mass flowmeter; 11, first small mass flowmeter; 12, second large mass flowmeter; 13, second small mass flowmeter meter; 14, the first solenoid valve; 15, the second solenoid valve; 16, the third solenoid valve; 17, the fourth solenoid valve; 18, the fifth solenoid valve; 19, the sixth solenoid valve; 20, the seventh solenoid valve; 21, the eighth solenoid valve; 22, the ninth solenoid valve; 23, the tenth solenoid valve; 24, the eleventh solenoid valve; 25, the pressure relief solenoid valve; 26, the pressure reducing valve; 501, the first air inlet pipe of the object to be measured; 502, the second air inlet pipe of the object to be measured; 503, the third air inlet pipe of the object to be measured; 504, the first air outlet pipe of the object to be measured; 505, the second air outlet pipe of the object to be measured; 506, the third air outlet pipe of the object to be measured. DETAILED DESCRIPTION

[0029] The following combination Figure 1-3 The utility model is described in further detail.

[0030] The utility model discloses a hydrogen fuel cell system pressure-maintaining comprehensive performance test bench, which mainly meets the requirements of the gas sealing test and leakage detection of the large mass flow loop of the fuel cell stack, air supply system, hydrogen supply system, and water heat management system of the hydrogen fuel cell system; the gas sealing test and leakage detection of the small mass flow of key components in each subsystem;

[0031] Reference Figure 1 , including a test loop system 100, a main control system 200, an auxiliary controller system 300, a low-voltage power supply system 400 and a test bench cabinet 600, wherein the auxiliary controller system 300 and the low-voltage power supply system 400 are respectively connected to the test loop system 100, the main control system 200 is connected to the auxiliary controller system 300, the test loop system 100 is arranged in the test bench cabinet 600, and the test bench cabinet 600 is provided with a pipe clamp, wherein,

[0032] The test loop system 100 includes a large mass flow loop, a small mass flow loop and a test pipeline. The large mass flow loop and the small mass flow loop are connected to the test pipeline after being arranged in parallel, and the test pipeline is connected to the object under test 500;

[0033] The main control system 200 includes a control cabinet, a test bench controller, a main control computer, and control software, and is interconnected and controlled with the test loop system 100 through the CAN protocol;

[0034] The auxiliary controller system 300 is used to control the start and stop of the equipment in the system;

[0035] The low voltage power supply system 400 is responsible for providing the required control power to each controller in the system;

[0036] The pipe clamps on the test bench cabinet 600 are used to fix the pipelines. All mechanical equipment, pipelines and other structural parts of the test bench can be integrated and installed in the test bench cabinet 600 and fixed by various types of pipe clamps to ensure that the system pressure maintenance passage can operate normally. If the test bench needs to be transferred, transported, or modified, the test bench cabinet 600 can be easily disassembled and reassembled.

[0037] In a further embodiment, referring to Figure 2 and Figure 3 The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench also includes an air pump 1 and a pressure reducing valve 26. The outlet of the air pump 1 is connected to the pressure reducing valve 26. The large mass flow loop includes a main inlet pipeline and a main outlet pipeline. The small mass flow loop includes an auxiliary inlet pipeline and an auxiliary outlet pipeline. The test pipeline is provided with multiple test pipelines, each including a test inlet pipeline and a test outlet pipeline. One end of the main inlet pipeline and the auxiliary inlet pipeline is connected to the pressure reducing valve 26, and the other end is connected to the test inlet pipeline. The object to be tested 500 is connected to the test inlet through the object inlet pipe. The outlet pipeline is connected, and the test outlet pipeline is connected through the measured object outlet pipe, and the outlet of the test outlet pipeline is respectively connected to the main outlet pipeline and the main outlet pipeline, and a first pressure transmitter 2 and a first solenoid valve 14 are provided between the pressure reducing valve 26 and the main inlet pipeline and the auxiliary inlet pipeline, and a pressure transmitter, a mass flow meter and a solenoid valve are provided on the main inlet pipeline, the main outlet pipeline, the auxiliary inlet pipeline and the auxiliary outlet pipeline, a pressure transmitter and a solenoid valve are provided on the test inlet pipeline, and a solenoid valve is provided on the test outlet pipeline;

[0038] Specifically, the pressure transmitters on the main inlet pipeline, the main outlet pipeline, the auxiliary inlet pipeline and the auxiliary outlet pipeline are located on the inlet side of the solenoid valve, the pressure transmitter on the test inlet pipeline is located on the outlet side of the solenoid valve, the mass flow meters on the main inlet pipeline and the auxiliary inlet pipeline are located on the inlet side of the solenoid valve, the mass flow meters on the main outlet pipeline and the auxiliary outlet pipeline are located on the outlet side of the solenoid valve, the solenoid valve, the pressure transmitter, the flow meter and the pipeline are all connected by a ferrule type, the air inlet pipe and the air outlet pipe of the object to be measured are long hoses, and they are all plug-in connections with the test pipeline and the object to be measured 500, and a pressure relief solenoid valve 25 is also connected at the outlet of the test outlet pipeline.

[0039] Example

[0040] In this embodiment, three test pipelines are provided. Figure 2 and Figure 3In the figure, A1 is the air inlet, A2 is the air outlet, a first pressure transmitter 2 and a first solenoid valve 14 are arranged between the pressure reducing valve 26 and the main inlet pipeline and the auxiliary inlet pipeline, a first large mass flowmeter 10, a second pressure transmitter 3 and a second solenoid valve 15 are arranged on the main inlet pipeline of the large mass flow loop, a second large mass flowmeter 12, a tenth solenoid valve 23 and a seventh pressure transmitter 8 are arranged on the main outlet pipeline; a first small mass flowmeter 11, a first solenoid valve 14 and a third solenoid valve 16 are arranged on the auxiliary inlet pipeline of the small mass flow loop, a second small mass flowmeter 13, an eleventh solenoid valve 24 and an eighth pressure transmitter 8 are arranged on the auxiliary outlet pipeline force transmitter 9; the test inlet pipelines of the three test pipelines are respectively provided with a fourth solenoid valve 17 and a fourth pressure transmitter 5, a fifth solenoid valve 18 and a fifth pressure transmitter 6, a sixth solenoid valve 19 and a sixth pressure transmitter 7; the test outlet pipelines are respectively provided with a seventh solenoid valve 20, an eighth solenoid valve 21, and a ninth solenoid valve 22, the test inlet pipelines are respectively connected to the object under test 500 through the first air inlet pipe 501 of the object under test, the second air inlet pipe 502 of the object under test, and the third air inlet pipe 503 of the object under test, and the test outlet pipelines are respectively connected to the object under test 500 through the first air outlet pipe 504 of the object under test, the second air outlet pipe 505 of the object under test, and the third air outlet pipe 506 of the object under test.

[0041] The working process of this embodiment is:

[0042] When the measured object 500 is a hydrogen fuel cell system or a large mass flow subsystem such as a fuel cell stack, an air supply system, a hydrogen supply system, a water heat management system, etc., the air demand is large, and it is necessary to close the small mass flow loop and open the large mass flow loop. It is assumed that there are three measured objects with large mass flow;

[0043] First, close the third solenoid valve 16 to close the main air intake path with a small mass flow rate; close the eleventh solenoid valve 24 to close the main air outlet path with a small mass flow rate; at the same time, close the pressure relief solenoid valve 25 to close the system discharge pressure relief port, and close the seventh solenoid valve 20, the eighth solenoid valve 21, the ninth solenoid valve 22 and the tenth solenoid valve 23; then, open the pressure reducing valve 26, the first solenoid valve 14, the second solenoid valve 15, the fourth solenoid valve 17, the fifth solenoid valve 18 and the sixth solenoid valve 19 in sequence, start the air pump 1, adjust the pressure reducing valve 26, observe that the pressure of the first pressure transmitter 2 is within the appropriate range, and the decompressed air enters the pipeline from the air inlet A1, passes through the first solenoid valve 14 and the first large mass flowmeter 10 and smoothly enters the large mass flow loop; then, through the control and adjustment of the fourth solenoid valve 17, the fifth solenoid valve 18 and the sixth solenoid valve 19, the air The air enters the first air inlet pipe 501, the second air inlet pipe 502 and the third air inlet pipe 503 of the object to be measured through three branches, and then flows into the object to be measured 500. At this time, the pressure gauge values ​​of the fourth pressure transmitter 5, the fifth pressure transmitter 6 and the sixth pressure transmitter 7 are observed. When the air tightness pressure maintenance requirements of the corresponding object to be measured 500 are met, the first solenoid valve 14, the fourth solenoid valve 17, the fifth solenoid valve 18, the sixth solenoid valve 19 and the air pump 1 are closed; the object to be measured 500 is kept under pressure for a certain period of time, and the pressure values ​​of the fourth pressure transmitter 5, the fifth pressure transmitter 6 and the sixth pressure transmitter 7 do not change, or the pressure drop is small, then the air tightness of the object to be measured 500 is qualified. After the test is qualified, the seventh solenoid valve 20, the eighth solenoid valve 21, the ninth solenoid valve 22 and the pressure relief solenoid valve 25 are opened in sequence, and the air is discharged into the atmosphere from the air outlet A2. If the number of objects to be tested is less than three, the corresponding branches can be closed and not used.

[0044] During the pressure holding test, if one or more of the objects under test 500 fail to meet the air tightness requirements, the test bench can continue to measure the leakage amount of the object under test 500 to assist in finding the leakage location;

[0045] If the air tightness of the three measured objects 500 is unqualified, first, open all the solenoid valves of the large mass flow loop, that is, open the first solenoid valve 14, the second solenoid valve 15, the fourth solenoid valve 17, the fifth solenoid valve 18, the sixth solenoid valve 19, the seventh solenoid valve 20, the eighth solenoid valve 21, the ninth solenoid valve 22, and the tenth solenoid valve 23 in sequence, then start the air pump 1, adjust the pressure reducing valve 26, observe that the pressure of the first pressure transmitter 2 is within the appropriate range, and the decompressed air enters the pipeline from the air inlet A1, and the air flows into and out of the measured object 500 continuously, and finally discharges into the atmosphere through the air outlet A2. At this time, the entire large mass flow loop is a continuous flow passage, observe and record the values ​​of the first large mass flow meter 10 and the second large mass flow meter 12, and calculate their difference, which is the air leakage of the measured object. According to the size of the leakage, the leakage location can be further checked. After the leakage test is completed, the air pump 1 can be directly turned off. If the number of tested objects is less than three, choose to close the corresponding branch and do not use it.

[0046] When the measured object 500 is a small mass flow device in a subsystem such as an air supply system, a hydrogen supply system, or a water heat management system, the air demand is small, and the large mass flow loop needs to be closed and the small mass flow loop needs to be opened. Assume that there are three measured objects with small mass flow.

[0047] Closing the second solenoid valve 15 closes the main air intake with large mass flow; closing the tenth solenoid valve 23 closes the main air outlet with large mass flow; at the same time, the pressure relief solenoid valve 25 needs to be closed to close the system discharge pressure relief port. Close the seventh solenoid valve 20, the eighth solenoid valve 21, the ninth solenoid valve 22, and the eleventh solenoid valve 24; then, open the pressure reducing valve 26, the first solenoid valve 14, the third solenoid valve 16, the fourth solenoid valve 17, the fifth solenoid valve 18, and the sixth solenoid valve 19 in sequence, start the air pump 1, adjust the pressure reducing valve 26, observe that the pressure of the first pressure transmitter 2 is within the appropriate range, and the decompressed air enters the pipeline from the air inlet A1, passes through the first solenoid valve 14 and the first small mass flowmeter 11, and smoothly enters the small mass flow loop; then, through the control and adjustment of the fourth solenoid valve 17, the fifth solenoid valve 18, and the sixth solenoid valve 19, the air passes through three branches. Enter the first air inlet pipe 501, the second air inlet pipe 502, and the third air inlet pipe 503 of the object to be measured respectively, and then flow into the object to be measured 500. At this time, observe the pressure gauge values ​​of the fourth pressure transmitter 5, the fifth pressure transmitter 6, and the sixth pressure transmitter 7. When the air tightness pressure maintenance requirements of the corresponding object to be measured 500 are met, close the first solenoid valve 14, the fourth solenoid valve 17, the fifth solenoid valve 18, the sixth solenoid valve 19, and the air pump 1; the object to be measured maintains pressure for a certain period of time, and the pressure values ​​of the fourth pressure transmitter 5, the fifth pressure transmitter 6, and the sixth pressure transmitter 7 do not change, or the pressure drop is small, then the air tightness of the object to be measured 500 is qualified. After the test is qualified, open the seventh solenoid valve 20, the eighth solenoid valve 21, the ninth solenoid valve 22, and the pressure relief solenoid valve 25 in turn, and the air is discharged into the atmosphere from the air outlet A2. If the number of objects 500 to be tested is less than three, choose to close the corresponding branch and do not use it.

[0048] During the pressure holding test, if one or more objects under test fail to meet the air tightness requirements, the test bench can continue to measure the leakage amount of the object under test 500 to assist in locating the leakage location.

[0049] Assume that the air tightness of the three measured objects 500 is unqualified. Open all the solenoid valves of the small mass flow loop, that is, open the first solenoid valve 14, the third solenoid valve 16, the fourth solenoid valve 17, the fifth solenoid valve 18, the sixth solenoid valve 19, the seventh solenoid valve 20, the eighth solenoid valve 21, the ninth solenoid valve 22, and the eleventh solenoid valve 24 in sequence, start the air pump 1, adjust the pressure reducing valve 26, observe that the pressure of the first pressure transmitter 2 is within the appropriate range, and the decompressed air enters the pipeline from the air inlet A1, and the air flows into and out of the measured object 500 continuously, and finally discharges into the atmosphere through the air outlet A2. At this time, the entire small mass flow loop is a continuous flow passage, observe and record the values ​​of the first small mass flowmeter 11 and the second small mass flowmeter 13, and calculate their difference, which is the air leakage of the measured object 500. According to the size of the leakage, the leakage location can be further checked. After the leakage test is completed, the air pump 1 can be directly turned off. If the number of the tested objects 500 is less than three, the corresponding branch circuits can be closed and not used.

[0050] During the system pressure-maintaining comprehensive performance test, it is necessary to continuously collect and transmit performance parameters through pressure transmitters, flow meters, etc. The performance parameters mainly include: the pressure after the pressure reducing valve 26; the pressure and flow at the main inlet; the pressure and flow at the auxiliary inlet; the pressure at the inlet of the object to be tested; the pressure and flow at the main outlet and the pressure and flow at the auxiliary outlet; finally, the data can be sorted, stored and printed out in a document format according to actual needs.

[0051] The utility model designs a universal hydrogen fuel cell system pressure-maintaining comprehensive performance test bench, which can meet the gas sealing test and leakage detection of the fuel cell stack, air supply system, hydrogen supply system, water heat management system, large mass flow loop, and small mass flow of key components in each subsystem of the 10-150KW level hydrogen fuel cell system; a small modification of a small number of mechanical and electrical components can be compatible with the installation requirements of hydrogen fuel cell systems of different brands; a small addition or modification of the system and software can meet the gas tightness test requirements of hydrogen fuel cell systems of different brands, and the control and detection interface remain consistent; and it can be operated and tested as a separate system, which can be conveniently transported or even disassembled and assembled, and is convenient for later maintenance and function changes. The bench test, control, data acquisition and processing related software are open source to users. The operating condition test in the characteristic test can be controlled manually and automatically, and the experimental data can be automatically collected, processed, displayed, stored and printed out in excel / pdf documents.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A hydrogen fuel cell system pressure maintenance comprehensive performance test bench, characterized in that: The invention comprises a test loop system (100), a main control system (200), an auxiliary controller system (300) and a low-voltage power supply system (400), wherein the auxiliary controller system (300) and the low-voltage power supply system (400) are respectively connected to the test loop system (100), and the main control system (200) is connected to the auxiliary controller system (300), wherein: The test loop system (100) comprises a large mass flow loop, a small mass flow loop and a test pipeline, the large mass flow loop and the small mass flow loop are connected to the test pipeline after being arranged in parallel, and the test pipeline is connected to the object to be tested (500); The main control system (200) includes a control cabinet, a test bench controller, a main control computer, and control software, and is interconnected and controlled with the test loop system (100) via a CAN protocol; The auxiliary controller system (300) is used to control the start and stop of the equipment in the system; The low voltage power supply system (400) is responsible for providing the required control power to each controller in the system.

2. The hydrogen fuel cell system pressure maintenance comprehensive performance test bench according to claim 1, characterized in that: It also comprises an air pump (1) and a pressure reducing valve (26), wherein the outlet of the air pump (1) is connected to the pressure reducing valve (26), and the outlet of the pressure reducing valve (26) is connected to a large mass flow loop and a small mass flow loop.

3. The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench according to claim 2, characterized in that: The large mass flow loop comprises a main inlet pipeline and a main outlet pipeline, the small mass flow loop comprises an auxiliary inlet pipeline and an auxiliary outlet pipeline, the test pipeline is provided with a plurality of pipelines, each comprising a test inlet pipeline and a test outlet pipeline, one end of the main inlet pipeline and the auxiliary inlet pipeline are connected to the pressure reducing valve (26), and the other end is connected to the test inlet pipeline, the object to be tested (500) is connected to the test inlet pipeline via the object to be tested air inlet pipe, and is connected to the test outlet pipeline via the object to be tested air outlet pipe, and the outlet of the test outlet pipeline is respectively connected to the main outlet pipeline and the main outlet pipeline.

4. The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench according to claim 3, characterized in that: A first pressure transmitter (2) and a first solenoid valve (14) are provided between the pressure reducing valve (26) and the main inlet pipeline and the auxiliary inlet pipeline; a pressure transmitter, a mass flow meter and a solenoid valve are provided on the main inlet pipeline, the main outlet pipeline, the auxiliary inlet pipeline and the auxiliary outlet pipeline; a pressure transmitter and a solenoid valve are provided on the test inlet pipeline; and a solenoid valve is provided on the test outlet pipeline.

5. The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench according to claim 4, characterized in that: The pressure transmitters on the main inlet pipeline, the main outlet pipeline, the auxiliary inlet pipeline and the auxiliary outlet pipeline are located on the inlet side of the solenoid valve, and the pressure transmitter on the test inlet pipeline is located on the outlet side of the solenoid valve.

6. The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench according to claim 4, characterized in that: The mass flowmeters on the main inlet pipeline and the auxiliary inlet pipeline are located on the inlet side of the solenoid valve, and the mass flowmeters on the main outlet pipeline and the auxiliary outlet pipeline are located on the outlet side of the solenoid valve.

7. The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench according to claim 6, characterized in that: The electromagnetic valve, the pressure transmitter, the flow meter and the pipeline are all connected by a ferrule type, and the air inlet pipe and the air outlet pipe of the object to be measured are long hoses, which are connected to the test pipeline and the object to be measured (500) by insertion.

8. The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench according to claim 3, characterized in that: The outlet of the test outlet pipeline is also connected to a pressure relief solenoid valve (25).

9. The hydrogen fuel cell system pressure-maintaining comprehensive performance test bench according to claim 1, characterized in that: It also comprises a test bench cabinet (600), wherein the test bench cabinet (600) is arranged outside the test loop system (100), and a pipe clamp is arranged on the test bench cabinet (600).

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