Hydrogen injection valve testing device and testing method thereof

Abstract

The invention relates to a hydrogen injection valve testing device and a testing method thereof, and belongs to the technical field of hydrogen injection valve testing, the hydrogen injection valve testing device comprises a performance testing table, a durability testing table, a signal acquisition and control module and an electrical power distribution module, the signal acquisition and control module is used for realizing performance, air tightness, electrical characteristic and working characteristic parameter experiments, the durability test board is used for realizing acquisition of pressure and temperature parameters required by durability tests, and the signal acquisition and control module is used for acquiring signals of the test board and controlling output so as to realize controllability and testability of a tested object; and the electrical power distribution module is used for providing driving and power distribution for the test board module and the tested object, and is also provided with a safety loop for ensuring electrical safety. And test control and display, data storage and the like are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen injection valve testing, and in particular to a hydrogen injection valve testing device and a testing method thereof. Background Art

[0002] Fuel cells have developed rapidly in the past few years. They have important uses in the field of transportation because of their advantages such as high efficiency, cleanliness, silence, high energy density, renewability and flexibility. In order to cope with various complex working conditions, the hydrogen supply must respond quickly, efficiently and stably. Due to the low density and explosiveness of hydrogen, ordinary gas injection valves can no longer meet the high requirements of hydrogen supply for fuel cells. Ordinary gas injection valves are usually made of steel, stainless steel or other materials suitable for common gases. Due to the characteristics of hydrogen, such as small molecular structure, high diffusivity and high flammability, hydrogen injection valves usually use special materials and sealing technologies to prevent hydrogen leakage and ensure safety. In terms of sealing, ordinary gas injection valves can meet the requirements with ordinary sealing designs, while hydrogen injection valves require special sealing designs and materials. In terms of safety structure design, ordinary injection valves only need general safety designs, while hydrogen injection valves require explosion-proof designs. Summary of the invention

[0003] The present invention aims to solve the above problems of the prior art. A hydrogen injection valve testing device and a testing method are proposed. The technical solution of the present invention is as follows:

[0004] A hydrogen injection valve testing device comprises: a performance test bench, a durability test bench, a signal acquisition and control module and an electrical distribution module, wherein the performance test bench is used to realize pressure control and acquisition, temperature and flow acquisition during hydrogen injection valve testing, and realize performance, air tightness, electrical characteristics and working characteristic parameter experiments; the durability test bench is used to realize the acquisition of pressure and temperature parameters required for durability testing; the signal acquisition and control module is used to collect test bench signals and control output, and realize controllable and testable objects under test; the electrical distribution module is used to provide drive and power distribution for the test bench module and the object under test, and is also designed with a safety circuit to ensure electrical safety.

[0005] Furthermore, the performance test bench includes:

[0006] Inlet module 1: It consists of a manual valve and a pneumatic valve, and is mainly used to control the entry of hydrogen into the test bench;

[0007] Pressure reducing module 1: It is composed of a pressure reducer and a solenoid valve, and is used to reduce the gas pressure to a suitable pressure; Pressure monitoring module 1: It is composed of a pressure gauge and a pressure sensor, and is used to detect the gas pressure after pressure reduction; Flow monitoring module: It is composed of a flow meter, and is used to monitor the gas flow entering the sample under test; Pressure control module: It is composed of a proportional valve and a pressure sensor, and the proportional valve is controlled by a PID control algorithm. It is adjusted by setting the set pressure value and the actual pressure collected by the pressure sensor, and is used to control the intake pressure of the sample under test; SOV1: Pneumatic valve, used to control the gas entering the sample under test; SOV2: Pneumatic valve, used for pressure relief, and shares a pressure sensor with the pressure control module. The pressure relief value is set by collecting data from the pressure sensor, and it automatically opens when the pressure reaches the pressure relief value; TI 1: It is used to detect the intake temperature of the sample under test; T I2: used to detect the exhaust temperature of the sample under test; back pressure module: composed of a back pressure valve and a pressure sensor, which can be controlled by a PID control algorithm to adjust the tail exhaust back pressure; HV1, HV2: used as an interface for connecting the durability test bench; intake module 2: composed of a manual valve and a pneumatic valve, used to control the nitrogen supply; pressure reducing module 2: composed of a pressure reducing valve, a pressure sensor and a pressure gauge, used to adjust the pressure of the pilot gas (nitrogen) entering the test bench; pressure reducing module 3: composed of a pressure reducing valve and a pressure gauge, used to adjust the pressure of the nitrogen purge branch entering the test bench; SOV3: pneumatic valve, used to control the nitrogen supply after pressure reduction; CKV1: a one-way valve, used to prevent hydrogen from flowing back into the nitrogen pipeline; SOVI 1: a valve island, used to control the pneumatic valve; pressure reducing module 4: composed of a pressure reducing valve, a pressure sensor and a pressure gauge, used to adjust the pressure of the pilot gas (nitrogen) entering the valve island.

[0008] Furthermore, the durability test bench comprises:

[0009] Intake module 3: composed of a manual valve and a pneumatic valve, mainly used to control the supply of air medium to the durability test bench; pressure reduction module 5: composed of a pressure reducer and a solenoid valve, used to reduce the gas pressure to a suitable pressure; pressure monitoring module 2: composed of a pressure gauge and a pressure sensor, used to detect the gas pressure after pressure reduction; pressure relief module: composed of a safety valve, a pneumatic valve and a pressure sensor, which can set the pressure relief threshold. When the threshold is reached, it opens to discharge the gas to protect the sample under test; SOV4: a pneumatic valve, used to control the gas entering the sample under test; TI 3: used to detect the intake temperature of the sample under test; PI 1: used to detect the tail gas pressure; HV5: used for air tail exhaust; HV3, HV4: used as an interface for connecting the performance test bench; intake module 4: used to control the supply of pilot gas (nitrogen); pressure reduction module 6: composed of a pressure reducing valve and a pressure sensor, used to adjust the nitrogen pressure; SOVI2: used to control the pneumatic valve of the durability test bench.

[0010] Furthermore, in the signal acquisition and control module, PLC is used for control and individual sensor analog signal acquisition, and the analog signal collected is 4-20mA; the high-speed acquisition card is mainly used for sensor signal acquisition, and the analog signal it collects is 0-10V.

[0011] A testing method based on the hydrogen injection valve testing device comprises the following steps:

[0012] Close all manual valves and turn the pressure reducing valve back to the closed state;

[0013] Install the sample to be tested and ensure that the pipeline interface is connected reliably;

[0014] Pilot gas (nitrogen) pressure setting: Open the air inlet module 2 and set the pressure of the pilot gas (nitrogen) pressure reducing valve module 2 to 500 kPa;

[0015] Nitrogen purge: Set the pressure of nitrogen purge branch pressure reducing module 3 to 200 kPa, open the pneumatic valves (SOV3, SOV1) in sequence, fully open the pressure control module and the back pressure valve control module, and perform nitrogen purge;

[0016] After the purge is completed, close the pneumatic valve (SOV3);

[0017] Performance test: Open the air inlet module 1, set the target pressure of the pressure control module according to the inlet pressure of the working condition under test, open the pneumatic valve (SOV1), and set the target pressure of the back pressure module according to the back pressure of the working condition under test;

[0018] And collect and record the sensor signals at each point, and generate the corresponding curve after the test is completed;

[0019] Shutdown and purge: close the air inlet module, open the nitrogen purge branch, and carry out the nitrogen purge process;

[0020] Shutdown: Close all pneumatic valves and manual valves to end the experiment.

[0021] A durability test method based on the hydrogen injection valve test bench comprises the following steps:

[0022] All manual valves and pressure reducing valves are turned back to the closed state;

[0023] Install the sample to be tested and ensure that the pipeline interface is connected reliably;

[0024] Pilot air pressure setting: open the air intake module 4 and set the pressure of the pilot air pressure reducing valve pressure reducing module 6 to 500 kPa;

[0025] Endurance test: open the air intake module 3, set the pressure of the pressure reducing module 5, open the pneumatic valve (SOV4), and conduct the experiment.

[0026] Stop the machine and close the manual valves one by one.

[0027] The advantages and beneficial effects of the present invention are as follows:

[0028] The present invention realizes pressure control and collection, temperature flow collection during hydrogen spray valve testing through a performance testing device, realizes performance, air tightness, electrical characteristics and working characteristic parameter experiments, realizes the collection of pressure and temperature parameters required for durability testing through a durability test bench, and realizes the collection and control output of test bench signals through a signal acquisition and control module, so that the object under test can be controlled and measured; the electrical distribution module is used to provide drive and power distribution for the test bench module and the object under test, and is also designed with a safety circuit to ensure electrical safety. Realize test control and display, data storage, etc. The design of the hydrogen spray valve test device of the present invention is realized as a whole through the above inseparable modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a hydrogen injection valve testing device provided in a preferred embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the circuit part of the hydrogen injection valve test device. DETAILED DESCRIPTION

[0031] The following will describe the technical solutions in the embodiments of the present invention in detail in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention.

[0032] The technical solution of the present invention to solve the above technical problems is:

[0033] Preferably, Figure 1 As shown, a hydrogen injection valve testing device includes: a performance test bench, a durability test bench, a signal acquisition and control module and an electrical distribution module, wherein the performance test bench is used to realize pressure control and acquisition, temperature and flow acquisition during hydrogen injection valve testing, and realize performance, air tightness, electrical characteristics and working characteristic parameter experiments; the durability test bench is used to realize the acquisition of pressure and temperature parameters required for durability testing; the signal acquisition and control module is used to collect test bench signals and control output to realize controllable and testable objects under test; the electrical distribution module is used to provide drive and power distribution for the test bench module and the object under test, and is also designed with a safety circuit to ensure electrical safety.

[0034] Preferably, the performance test bench comprises:

[0035] Inlet module 1: It consists of a manual valve and a pneumatic valve, and is mainly used to control the entry of hydrogen into the test bench;

[0036] Pressure reducing module 1: composed of a pressure reducer and a solenoid valve, used to reduce the gas pressure to a suitable pressure; Pressure monitoring module 1: composed of a pressure gauge and a pressure sensor, used to detect the gas pressure after pressure reduction; Flow monitoring module: composed of a flow meter, used to monitor the gas flow entering the sample under test; Pressure control module: composed of a proportional valve and a pressure sensor, the proportional valve is controlled by a PID control algorithm, and is adjusted by setting a set pressure value and collecting actual pressure from the pressure sensor to control the intake pressure of the sample under test; SOV1: a pneumatic valve, used to control the gas entering the sample under test; SOV2: a pneumatic valve, used for pressure relief, and shares a pressure sensor with the pressure control module, and sets the pressure relief value by collecting data from the pressure sensor, and automatically opens when the pressure reaches the pressure relief value; TI 1: used to detect the intake temperature of the sample under test; TI 2: used to detect the exhaust temperature of the sample under test; Back pressure module: composed of a back pressure valve and a pressure sensor, which can be adjusted by P ID control algorithm controls and adjusts the tail exhaust back pressure; HV1, HV2: used as the interface for connecting the durability test bench; Intake module 2: composed of a manual valve and a pneumatic valve, used to control the nitrogen supply; Pressure reducing module 2: composed of a pressure reducing valve, a pressure sensor and a pressure gauge, used to adjust the pressure of the pilot gas (nitrogen) entering the test bench; Pressure reducing module 3: composed of a pressure reducing valve and a pressure gauge, used to adjust the pressure of the nitrogen purge branch entering the test bench; SOV3: pneumatic valve, used to control the nitrogen supply after pressure reduction; CKV1: a one-way valve, used to prevent hydrogen from flowing back into the nitrogen pipeline; SOVI 1: valve island, used to control the pneumatic valve; Pressure reducing module 4: composed of a pressure reducing valve, a pressure sensor and a pressure gauge, used to adjust the pressure of the pilot gas (nitrogen) entering the valve island.

[0037] Preferably, the durability test bench comprises:

[0038] Intake module 3: composed of a manual valve and a pneumatic valve, mainly used to control the supply of air medium to the durability test bench; pressure reduction module 5: composed of a pressure reducer and a solenoid valve, used to reduce the gas pressure to a suitable pressure; pressure monitoring module 2: composed of a pressure gauge and a pressure sensor, used to detect the gas pressure after pressure reduction; pressure relief module: composed of a safety valve, a pneumatic valve and a pressure sensor, which can set the pressure relief threshold. When the threshold is reached, it opens to discharge the gas to protect the sample under test; SOV4: a pneumatic valve, used to control the gas entering the sample under test; TI 3: used to detect the intake temperature of the sample under test; PI 1: used to detect the tail gas pressure; HV5: used for air tail exhaust; HV3, HV4: used as an interface for connecting the performance test bench; intake module 4: used to control the supply of pilot gas (nitrogen); pressure reduction module 6: composed of a pressure reducing valve and a pressure sensor, used to adjust the nitrogen pressure; SOVI 2: used to control the pneumatic valve of the durability test bench.

[0039] Specifically, the main components of the performance test bench are as follows: air intake module, pressure reducing module, pressure monitoring module, flow monitoring module, back pressure control module, pneumatic valve / solenoid valve (SOV), valve island (SOVI), check valve (CKV), hand valve (HV), temperature sensor TI. The following is an introduction to the components and their functions:

[0040] 1. Inlet module 1: It consists of a manual valve and a pneumatic valve, and is mainly used to control the hydrogen entering the test bench.

[0041] 2. Pressure reducing module 1: It consists of a pressure reducer and a solenoid valve, and is used to reduce the gas pressure to a suitable pressure.

[0042] 3. Pressure monitoring module 1: It consists of a pressure gauge and a pressure sensor, and is used to detect the gas pressure after decompression.

[0043] 4. Flow monitoring module: It is composed of a flow meter and is used to monitor the gas flow entering the sample being tested.

[0044] 5. Pressure control module: It consists of a proportional valve and a pressure sensor. The proportional valve is controlled by a PID control algorithm and is adjusted by setting a set pressure value and collecting the actual pressure from the pressure sensor to control the intake pressure of the sample being tested.

[0045] 6.SOV1: Pneumatic valve, used to control the gas entering the sample being tested.

[0046] 7.SOV2: Pneumatic valve, used for pressure relief, shares a pressure sensor with the pressure control module, collects data through the pressure sensor to set the pressure relief value, and automatically opens when the pressure reaches the pressure relief value.

[0047] 8.TI1: Used to detect the intake temperature of the sample being tested.

[0048] 9.TI2: Used to detect the exhaust temperature of the sample being tested.

[0049] 10. Back pressure module: It consists of a back pressure valve and a pressure sensor, which can be controlled by PID control algorithm to adjust the tail exhaust back pressure.

[0050] 11.HV1, HV2: used as the interface for connecting the endurance test bench.

[0051] 12. Air intake module 2: It consists of a manual valve and a pneumatic valve, and is used to control the nitrogen supply.

[0052] 13. Pressure reducing module 2: It consists of a pressure reducing valve, a pressure sensor and a pressure gauge, and is used to adjust the pressure of the pilot gas (nitrogen) entering the test bench.

[0053] 14. Pressure reducing module 3: It is composed of a pressure reducing valve and a pressure gauge, and is used to adjust the pressure of the nitrogen purge branch entering the test bench.

[0054] 15.SOV3: Pneumatic valve, used to control the supply of nitrogen after decompression.

[0055] 16.CKV1: One-way valve, used to prevent hydrogen from flowing back into the nitrogen pipeline.

[0056] 17.SOVI1: Valve island, used to control pneumatic valves.

[0057] 18. Pressure reducing module 4: It consists of a pressure reducing valve, a pressure sensor and a pressure gauge, and is used to adjust the pressure of the pilot gas (nitrogen) entering the valve island.

[0058] The performance test process is as follows:

[0059] ⑧ Close all manual valves and turn the pressure reducing valve back to the closed state;

[0060] ⑨Install the sample to be tested and ensure that the pipeline interface connection is reliable;

[0061] ⑩ Pilot gas (nitrogen) pressure setting: Open the air inlet module 2 and set the pressure of the pilot gas (nitrogen) pressure reducing valve module 2 to 500 kPa.

[0062] Nitrogen purge: Set the pressure of nitrogen purge branch pressure reducing module 3 to 200kPa, open the pneumatic valves (SOV3, SOV1) in sequence, fully open the pressure control module and the back pressure valve control module, and perform nitrogen purge. After the purge is completed, close the pneumatic valve (SOV3);

[0063] Performance test: Open the air inlet module 1, set the target pressure of the pressure control module according to the inlet pressure of the working condition under test, open the pneumatic valve (SOV1), and set the target pressure of the back pressure module according to the back pressure of the working condition under test. Collect and record the sensor signals at each point, and generate the corresponding curve after the test is completed;

[0064] Shutdown and purge: close the air inlet module, open the nitrogen purge branch, and carry out the nitrogen purge process;

[0065] Shutdown: Close all pneumatic valves and manual valves to end the experiment.

[0066] The main components of the endurance test module are as follows: air intake module, pressure reducing module, pressure monitoring module, pressure relief module, pneumatic valve / solenoid valve (SOV), valve island (SOVI), hand valve (HV), temperature sensor (TI), pressure sensor (PI). The following is an introduction to the components and their functions:

[0067] 1. Air intake module 3: It is composed of a manual valve and a pneumatic valve, and is mainly used to control the supply of air medium to the durability test bench.

[0068] 2. Pressure reducing module 5: It is composed of a pressure reducer and a solenoid valve and is used to reduce the gas pressure to a suitable pressure.

[0069] 3. Pressure monitoring module 2: It consists of a pressure gauge and a pressure sensor, and is used to detect the gas pressure after decompression.

[0070] 4. Pressure relief module: It is composed of a safety valve, a pneumatic valve and a pressure sensor. The pressure relief threshold can be set. When the threshold is reached, it opens to discharge the gas to protect the sample being tested.

[0071] 5.SOV4: Pneumatic valve, used to control the gas entering the sample being tested.

[0072] 6.TI3: Used to detect the intake temperature of the sample being tested.

[0073] 7.PI1: used to detect tail gas pressure.

[0074] 8.HV5: used for air tail exhaust.

[0075] 9.HV3, HV4: used as a connection performance test bench interface.

[0076] 10. Air intake module 4: used to control the supply of pilot gas (nitrogen).

[0077] 11. Pressure reducing module 6: It consists of a pressure reducing valve and a pressure sensor and is used to adjust the nitrogen pressure.

[0078] 12.SOVI2: Used to control the pneumatic valves of the endurance test bench.

[0079] The durability test process is as follows:

[0080] ⑥ All manual valves and pressure reducing valves are turned back to the closed state;

[0081] ⑦Install the sample to be tested and ensure that the pipeline interface connection is reliable;

[0082] ⑧ Pilot air pressure setting: open the air intake module 4 and set the pressure of the pilot air pressure reducing valve pressure reducing module 6 to 500 kPa;

[0083] ⑨ Durability test: Open the air intake module 3, set the pressure of the pressure reducing module 5, open the pneumatic valve (SOV4), and conduct the experiment.

[0084] ⑩Stop the machine and close the manual valves one by one.

[0085] Circuit principle: The circuit part is implemented by PLC and high-speed acquisition card. PLC is mainly used for control and individual sensor analog signal acquisition. The analog signal collected is 4-20mA. High-speed acquisition card is mainly used for sensor signal acquisition. The analog signal collected is 0-10V. Its implementation principle is as follows Figure 2 As shown:

[0086] 1. The flow meter FM communication method is RS485, and its data is directly collected by PLC.

[0087] 2. A hydrogen concentration sensor (HCS) is installed in the test chamber to detect whether hydrogen is leaking during the test. The output is 4-20mA analog quantity, and its data is directly collected by PLC.

[0088] 3. The output of pressure (PI) and temperature sensor (TI) is 0-10V analog quantity, and its data is acquired by high-speed acquisition card.

[0089] 4. The current (CI) and voltage sensors (VI) are external components used to detect the current and voltage passing through the device under test. Their output is 0-10V analog quantity, and their data is acquired by the high-speed acquisition card.

[0090] 5. After the high-speed acquisition card acquires the data, it is input into the host computer and the acquired data is written into the PLC through Ethernet communication.

[0091] 6. After the PLC obtains the data, it controls the proportional valve (POV) to adjust the pressure, and its output is a 4-20mA analog quantity.

[0092] 7. The PLC is connected to the valve island (SOVI) via Ethercat communication to control different pneumatic valves (SOV).

[0093] 8. The sample under test is a hydrogen injection valve, which needs to generate a PWM signal through a PWM generator and amplify the voltage through an MCU to drive the sample under test.

[0094] 9. The host computer controls the PWM generator to generate PWM signals through CAN communication.

[0095] The above embodiments should be understood to be only used to illustrate the present invention and not to limit the protection scope of the present invention. After reading the contents of the present invention, technicians can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

Claims

1. A hydrogen injection valve testing device, characterized in that: include: Performance test bench, durability test bench, signal acquisition and control module and electrical distribution module, wherein the performance test bench is used to realize pressure control and acquisition, temperature and flow acquisition during hydrogen spray valve testing, and realize performance, air tightness, electrical characteristics and working characteristic parameter experiments; the durability test bench is used to realize the acquisition of pressure and temperature parameters required for durability testing; the signal acquisition and control module is used to collect test bench signals and control output to realize controllable and measurable objects under test; the electrical distribution module is used to provide drive and power distribution for the test bench module and the object under test, and is also designed with a safety circuit to ensure electrical safety.

2. A hydrogen injection valve testing device according to claim 1, characterized in that: The performance test bench comprises: Inlet module 1: It is composed of a manual valve and a pneumatic valve, and is mainly used to control the entry of hydrogen into the test bench; Pressure reduction module 1: It is composed of a pressure reducer and a solenoid valve, and is used to reduce the gas pressure to an appropriate pressure; Pressure monitoring module 1: It is composed of a pressure gauge and a pressure sensor, and is used to detect the gas pressure after pressure reduction; Flow monitoring module: It is composed of a flow meter, and is used to monitor the gas flow entering the sample under test; Pressure control module: It is composed of a proportional valve and a pressure sensor, and the proportional valve is controlled by a PID control algorithm. It is adjusted by setting the set pressure value and the actual pressure collected by the pressure sensor, and is used to control the intake pressure of the sample under test; SOV1: Pneumatic valve, used to control the entry of gas into the sample under test; SOV2: Pneumatic valve, used for pressure relief, and shares a pressure sensor with the pressure control module. The pressure relief value is set by collecting data from the pressure sensor, and it automatically opens when the pressure reaches the pressure relief value; TI1: It is used to detect the sample under test Product intake temperature; TI2: used to detect the exhaust temperature of the sample under test; back pressure module: composed of a back pressure valve and a pressure sensor, which can be controlled by a PID control algorithm to adjust the tail exhaust back pressure; HV1, HV2: used as an interface for connecting the durability test bench; intake module 2: composed of a manual valve and a pneumatic valve, used to control the nitrogen supply; pressure reducing module 2: composed of a pressure reducing valve, a pressure sensor and a pressure gauge, used to adjust the pressure of the pilot gas (nitrogen) entering the test bench; pressure reducing module 3: composed of a pressure reducing valve and a pressure gauge, used to adjust the pressure of the nitrogen purge branch entering the test bench; SOV3: pneumatic valve, used to control the nitrogen supply after pressure reduction; CKV1: a one-way valve, used to prevent hydrogen from flowing back into the nitrogen pipeline; SOVI1: a valve island, used to control the pneumatic valve; pressure reducing module 4: composed of a pressure reducing valve, a pressure sensor and a pressure gauge, used to adjust the pressure of the pilot gas (nitrogen) entering the valve island.

3. A hydrogen injection valve testing device according to claim 1, characterized in that: The durability test bench comprises: Intake module 3: composed of a manual valve and a pneumatic valve, mainly used to control the supply of air medium to the durability test bench; pressure reduction module 5: composed of a pressure reducer and a solenoid valve, used to reduce the gas pressure to a suitable pressure; pressure monitoring module 2: composed of a pressure gauge and a pressure sensor, used to detect the gas pressure after pressure reduction; pressure relief module: composed of a safety valve, a pneumatic valve and a pressure sensor, which can set the pressure relief threshold. When the threshold is reached, it opens to discharge the gas to protect the sample under test; SOV4: a pneumatic valve, used to control the gas entering the sample under test; TI3: used to detect the intake temperature of the sample under test; PI1: used to detect the tail gas pressure; HV5: used for air tail exhaust; HV3, HV4: used as an interface for connecting the performance test bench; intake module 4: used to control the supply of pilot gas (nitrogen); pressure reduction module 6: composed of a pressure reducing valve and a pressure sensor, used to adjust the nitrogen pressure; SOVI2: used to control the pneumatic valve of the durability test bench.

4. A hydrogen injection valve testing device according to claim 1, characterized in that: In the signal acquisition and control module, PLC is used for control and individual sensor analog signal acquisition, and the analog signal collected is 4-20mA; the high-speed acquisition card is mainly used for sensor signal acquisition, and the analog signal it collects is 0-10V.

5. A testing method based on the hydrogen injection valve testing device according to claim 2, characterized in that: The following steps are involved: ① Close all manual valves and turn the pressure reducing valve back to the closed state; ②Install the sample to be tested and ensure that the pipeline interface connection is reliable; ③ Pilot gas (nitrogen) pressure setting: Open the air intake module 2 and set the pressure of the pilot gas (nitrogen) pressure reducing valve module 2 to 500 kPa; ④ Nitrogen purge: Set the pressure of nitrogen purge branch pressure reducing module 3 to 200 kPa, open the pneumatic valves (SOV3, SOV1) in sequence, fully open the pressure control module and the back pressure valve control module, and perform nitrogen purge; after the purge is completed, close the pneumatic valve (SOV3); ⑤Performance test: Open the air intake module 1, set the target pressure of the pressure control module according to the inlet pressure of the working condition under test, open the pneumatic valve (SOV1), set the target pressure of the back pressure module according to the back pressure of the working condition under test; collect and record the sensor signals at each point, and generate the corresponding curve after the test is completed; ⑥ Shutdown and purge: close the air inlet module, open the nitrogen purge branch, and carry out the nitrogen purge process; ⑦ Shutdown: Close all pneumatic valves and manual valves to end the experiment.

6. A testing method based on the hydrogen injection valve testing device according to claim 3, characterized in that: The following steps are involved: ① All manual valves and pressure reducing valves are turned back to the closed state; ②Install the sample to be tested and ensure that the pipeline interface connection is reliable; ③ Pilot air pressure setting: open the air intake module 4 and set the pressure of the pilot air pressure reducing valve pressure reducing module 6 to 500 kPa; ④Durability test: open the air intake module 3, set the pressure of the pressure reducing module 5, open the pneumatic valve (SOV4), and conduct the experiment. ⑤Stop the machine and close the manual valves one by one.

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