Reliability test device for direct injection hydrogen injector

Abstract

The present invention provides a reliability testing device for an in-cylinder direct-injection hydrogen injector, which relates to the field of testing technology. The reliability testing device for an in-cylinder direct-injection hydrogen injector comprises: an air supply system module, the air supply system module is used to provide a test gas source to the injector under test; a pressure regulating system module, the outlet end of the air supply system module is connected to the inlet end of the pressure regulating system module, the outlet end of the pressure regulating system module is connected to the inlet end of the injector under test, and the pressure regulating system module is used to adjust the gas pressure at the inlet end of the injector under test; a test system module, the test system module comprises a test fixture and a test module, and the injector under test is arranged in the test fixture; an environmental simulation module, the environmental simulation module is connected to a cavity in the test fixture, the environmental simulation module is used to simulate specific environmental characteristics when the injector under test is injected, and the test module is used to test the injection condition of the injector under the specific environmental characteristics.

Description

Technical Field

[0001] The present invention relates to the field of testing technology, and in particular to a reliability testing device for an in-cylinder direct injection hydrogen injector. Background Art

[0002] Hydrogen engines have unique advantages in power density and zero emissions, and are one of the key technologies for the future development of high-power engines. Compared to port injectors, direct-injection hydrogen injectors have higher power density and better sealing. However, direct-injection hydrogen injectors require a higher gas supply pressure, generally around 30 bar, and the nozzle tip extends directly into the cylinder, subjecting it to high-temperature erosion during combustion. Therefore, special operating conditions such as high pressure and high temperature place higher demands on the injector. To ensure the reliable operation of hydrogen engines, direct-injection hydrogen injectors must undergo bench reliability testing before installation. This simulates the high-pressure and high-temperature operating conditions of the injector within the engine to evaluate its performance and lifespan.

[0003] Currently, there are no mature testing devices and methods in the field of gas injector reliability test research technology, especially in high-temperature reliability. Summary of the Invention

[0004] The main purpose of the present invention is to provide a reliability testing device for an in-cylinder direct injection hydrogen injector, so as to solve the problem in the prior art that there is no device for testing the hydrogen injector under specific environmental characteristics.

[0005] To achieve the above objectives, according to one aspect of the present invention, a reliability testing device for an in-cylinder direct injection hydrogen injector is provided. The reliability testing device for an in-cylinder direct injection hydrogen injector comprises: an air supply system module, the air supply system module being configured to provide a test gas source to the injector under test; a pressure regulating system module, the outlet of the air supply system module being connected to the inlet of the pressure regulating system module, the outlet of the pressure regulating system module being connected to the inlet of the injector under test, and the pressure regulating system module being configured to regulate the gas pressure at the inlet of the injector under test; a test system module, the test system module comprising a test fixture and a test module, the injector under test being disposed within the test fixture; and an environmental simulation module, the environmental simulation module being connected to a cavity within the test fixture, the environmental simulation module being configured to simulate specific environmental characteristics of the injector under test during injection, and the test module being configured to test the injection performance of the injector under the specific environmental characteristics.

[0006] Furthermore, the test fixture includes an upper shell cavity and a bottom shell cavity separated from each other, the shell part of the injector under test is arranged in the upper shell cavity, the nozzle part of the injector under test is arranged in the bottom shell cavity, and the environmental simulation module is connected to the upper shell cavity and the bottom shell cavity.

[0007] Furthermore, the environmental simulation module includes: a cooling system module, the outlet end of the cooling system module is connected to the upper shell cavity, and the cooling system module is used to provide cooling air; a high-temperature heating module, the outlet end of the high-temperature heating module is connected to the bottom shell cavity, and the high-temperature heating module is used to provide high-temperature oil.

[0008] Furthermore, the test module includes: a pressure-stabilizing tank, the inlet end of the pressure-stabilizing tank is connected to the outlet end of the bottom shell cavity, and the pressure-stabilizing tank is used to collect the gas ejected from the nozzle part of the injector under test; a gas flow meter, the inlet end of the gas flow meter is connected to the outlet end of the pressure-stabilizing tank; a back pressure pressure sensor, the back pressure pressure sensor is arranged on the pipeline at the outlet end of the pressure-stabilizing tank, and the back pressure pressure sensor is used to obtain the back pressure pressure of the gas ejected from the injector under test; a back pressure valve, the back pressure valve is arranged on the pipeline at the outlet end of the pressure-stabilizing tank, and the back pressure valve is used to adjust the injection back pressure according to the back pressure pressure collected by the back pressure pressure sensor.

[0009] Furthermore, a first temperature sensor is provided on the upper shell cavity, and a second temperature sensor is provided on the bottom shell cavity. The first temperature sensor is used to detect the temperature information of the shell part of the injector under test, and the second temperature sensor is used to detect the temperature information of the nozzle part of the injector under test. At least part of the cooling system module is electrically connected to the first temperature sensor, and at least part of the high-temperature heating module is electrically connected to the second temperature sensor.

[0010] Furthermore, the high-temperature heating module includes: a high-temperature oil-type mold temperature controller, which is electrically connected to the second temperature sensor, the outlet end of the high-temperature oil-type mold temperature controller is connected to the bottom shell cavity through an oil supply pipeline, and the inlet end of the high-temperature oil-type mold temperature controller is connected to the bottom shell cavity through an oil return pipeline, and the high-temperature oil-type mold temperature controller adjusts the oil temperature according to the temperature information of the nozzle part of the injector under test; an oil supply valve, which is arranged on the oil supply pipeline; and an oil return valve, which is arranged on the oil return pipeline.

[0011] Furthermore, the cooling system module includes: an air compressor; a vortex cooler, the outlet end of the air compressor is connected to the inlet end of the vortex cooler, and the outlet end of the vortex cooler is connected to the upper shell cavity; a proportional control valve, the proportional control valve is arranged on the pipeline between the outlet end of the air compressor and the inlet end of the vortex cooler, the proportional control valve is electrically connected to the first temperature sensor, and the proportional control valve is used to control the flow rate of compressed air in the vortex cooler according to the temperature information of the shell part of the injector under test.

[0012] Furthermore, the gas supply system module includes multiple gas container units, the outlet end of each gas container unit is connected to a connecting pipeline, the outlet ends of the multiple connecting pipelines are connected to the inlet end of a common pipeline, the outlet end of the common pipeline is connected to the inlet end of the pressure regulating system module, and each connecting pipeline is provided with an air intake valve and a one-way valve, which control at least one of the multiple air intake valves to be closed, so that at least one of the multiple gas container units is in a standby state.

[0013] Furthermore, the test system module also includes: an intake rail pipe, the outlet end of the pressure regulating system module is connected to the inlet end of the intake rail pipe, the outlet end of the intake rail pipe is connected to the inlet end of the injector under test, and a pressure sensor and a third temperature sensor are provided on the intake rail pipe. The pressure sensor is used to detect the gas pressure in the intake rail pipe, and the third temperature sensor is used to detect the gas temperature in the intake rail pipe. The pressure sensor and the third temperature sensor are electrically connected to at least part of the pressure regulating system module.

[0014] Furthermore, the pressure regulating system module includes: a pressure reducer, the inlet end of the pressure reducer is connected to the outlet end of the air supply system module; a buffer tank, the inlet end of the buffer tank is connected to the outlet end of the pressure reducer, and the outlet end of the buffer tank is connected to the inlet end of the intake rail pipe. An electrically controlled switching valve, an intake pressure sensor, and an electrically controlled pressure regulating valve are sequentially provided on the pipeline between the outlet end of the pressure reducer and the inlet end of the buffer tank. The electrically controlled pressure regulating valve is electrically connected to the pressure sensor and the third temperature sensor. The electrically controlled pressure regulating valve is adjusted according to the gas pressure and gas temperature in the intake rail pipe.

[0015] By applying the technical solution of the present invention, the gas supply system module is used to provide the system with test gas of sufficient pressure and flow rate to meet the long-term uninterrupted gas supply requirements for reliability testing. The pressure regulating system module can open and close the gas supply according to the needs of the test, and can accurately adjust the gas pressure at the inlet of the test injector to improve the accuracy and reliability of the test. The environmental simulation module can simulate the specific environmental characteristics such as high temperature and high pressure encountered by the test injector in actual use. The test system module is used to realize the installation of the test injector and the measurement of the injection flow rate, thereby completing the reliability test of the test injector. The device can not only accurately simulate the actual working environment of the direct injection hydrogen injector in the cylinder, but also can perform efficient, safe and accurate testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 The figure shows a structural block diagram of a reliability testing device for an in-cylinder direct injection hydrogen injector according to the present invention.

[0018] The above drawings include the following reference numerals:

[0019] 1. Gas supply system module; 11. Gas container unit; 12. Inlet valve; 13. Check valve; 14. Public pipeline;

[0020] 2. Pressure regulating system module; 21. Pressure reducer; 22. Electronically controlled on / off valve; 23. Intake pressure sensor; 24. Electronically controlled pressure regulating valve; 25. Buffer tank;

[0021] 3. Cooling system module; 31. Air compressor; 32. Proportional control valve; 33. Vortex cooler;

[0022] 4. High-temperature heating module; 41. High-temperature oil-type mold temperature controller; 42. Oil supply valve; 43. Oil inlet distribution block; 44. Return oil collection block; 45. Oil return valve;

[0023] 5. Test system module;

[0024] 51. Intake rail pipe; 511. Pressure sensor; 512. Third temperature sensor;

[0025] 52. The ejector under test;

[0026] 53. Test fixture; 531. First temperature sensor; 532. Second temperature sensor; 533. Upper shell cavity; 534. Bottom shell cavity;

[0027] 54. Pressure stabilizing tank;

[0028] 55. Gas flow meter;

[0029] 56. Back pressure valve;

[0030] 57. Back pressure sensor;

[0031] 58. Injector ECU. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0036] Combine Figure 1 As shown, according to a specific embodiment of the present invention, a reliability testing device for an in-cylinder direct injection hydrogen injector is provided.

[0037] Specifically, if Figure 1 As shown, a reliability testing device for an in-cylinder direct injection hydrogen injector includes: an air supply system module 1, the air supply system module 1 is used to provide a test gas source to the injector 52 under test; a pressure regulating system module 2, the outlet end of the air supply system module 1 is connected to the inlet end of the pressure regulating system module 2, the outlet end of the pressure regulating system module 2 is connected to the inlet end of the injector 52 under test, and the pressure regulating system module 2 is used to adjust the gas pressure at the inlet end of the injector 52 under test; a test system module 5, the test system module 5 includes a test fixture 53 and a test module, and the injector 52 under test is arranged in the test fixture 53; an environmental simulation module, the environmental simulation module is connected to the cavity in the test fixture 53, the environmental simulation module is used to simulate the specific environmental characteristics of the injector 52 under test during injection, and the test module is used to test the injection condition of the injector 52 under specific environmental characteristics.

[0038] In this embodiment, the gas supply system module 1 is used to provide the system with test gas of sufficient pressure and flow to meet the long-term uninterrupted gas supply requirements for reliability testing. The pressure regulating system module 2 can open and close the gas supply according to the needs of the test, and can accurately adjust the inlet gas pressure of the test injector 52 to improve the accuracy and reliability of the test. The environmental simulation module can simulate the high temperature, high pressure and other specific environmental characteristics encountered by the test injector in actual use. The test system module 5 is used to realize the installation of the test injector 52 and the measurement of the injection flow, thereby completing the reliability test of the test injector 52. This device can not only accurately simulate the actual working environment of the direct injection hydrogen injector in the cylinder, but also can perform efficient, safe and accurate testing.

[0039] In some optional embodiments, the test fixture 53 can be adjusted according to the number of injectors 52 to be tested, that is, the test fixture 53 can be increased or decreased according to the test requirements, which is suitable for testing injectors of different models and quantities, thereby improving the flexibility and applicability of the device.

[0040] Furthermore, the test fixture 53 includes an upper shell cavity 533 and a bottom shell cavity 534 separated from each other, the shell portion of the injector 52 under test is arranged in the upper shell cavity 533, the nozzle portion of the injector 52 under test is arranged in the bottom shell cavity 534, and the environmental simulation module is connected to the upper shell cavity 533 and the bottom shell cavity 534.

[0041] Specifically, the separation of the upper shell cavity 533 and the bottom shell cavity 534 allows for separate temperature control and environmental simulation of the injector's housing and nozzle, ensuring that each component achieves ideal thermodynamic and kinetic conditions during testing while also improving the device's sealing. The environmental simulation module, connected to the upper shell cavity 533 and the bottom shell cavity 534, can independently adjust the cooling effect of the housing and the high temperature conditions at the nozzle end. This more accurately simulates the actual operating environment of the injector under direct injection in the engine cylinder, resulting in more realistic test data.

[0042] Furthermore, the environmental simulation module includes: a cooling system module 3, the outlet end of the cooling system module 3 is connected to the upper shell cavity 533, and the cooling system module 3 is used to provide cooling air; a high-temperature heating module 4, the outlet end of the high-temperature heating module 4 is connected to the bottom shell cavity 534, and the high-temperature heating module 4 is used to provide high-temperature oil.

[0043] Specifically, the cooling system module 3 is used to keep the electromagnetic part of the injector 52 under test at a normal operating temperature when it is generating heat or being heated; the high-temperature heating module 4 is used to keep the nozzle end of the injector 52 under test at a high temperature; through the cooling system module 3 and the high-temperature heating module 4, the temperatures in the upper shell cavity 533 and the bottom shell cavity 534 can be accurately controlled respectively. The cooling system module 3 can ensure that the temperature of the upper shell part of the injector is stable under long-term operation to prevent overheating of the electromagnetic components, while the high-temperature heating module 4 can simulate the working state of the nozzle under a high-temperature combustion environment, which is crucial for evaluating the performance and durability of the injector under extreme temperature conditions. The use of cooling air and high-temperature oil can be closer to the cooling and heating conditions during actual engine operation, thereby improving the simulation accuracy of the test device. This simulation capability helps to reproduce the thermal stress and temperature gradient of the injector in actual application in a laboratory environment.

[0044] Furthermore, the test module includes: a pressure-surge tank 54, the inlet end of the pressure-surge tank 54 is connected to the outlet end of the bottom shell cavity 534, and the pressure-surge tank 54 is used to collect the gas ejected from the nozzle part of the injector 52 under test; a gas flow meter 55, the inlet end of the gas flow meter 55 is connected to the outlet end of the pressure-surge tank 54; a back pressure pressure sensor 57, the back pressure pressure sensor 57 is arranged on the pipeline at the outlet end of the pressure-surge tank 54, and the back pressure pressure sensor 57 is used to obtain the back pressure pressure of the gas ejected from the injector 52 under test; a back pressure valve 56, the back pressure valve 56 is arranged on the pipeline at the outlet end of the pressure-surge tank 54, and the back pressure valve 56 is used to adjust the injection back pressure according to the back pressure pressure collected by the back pressure pressure sensor 57, so as to simulate the back pressure state of the gas injected into the cylinder of the gas engine by the injector 52 under test.

[0045] Specifically, the combination of the back pressure sensor 57 and the back pressure valve 56 can monitor and accurately adjust the back pressure of the gas ejected by the injector 52 under test in real time. This capability can not only simulate the back pressure environment of the injector in the engine cylinder, but also flexibly adjust the back pressure state according to the test requirements. The surge tank 54 collects the gas ejected from the nozzle. Through its internal volume and structural design, it can effectively reduce the pressure fluctuations during the gas injection process and ensure that the gas is in a stable state before reaching the gas flow meter 55. The provision of the back pressure sensor 57 enables the back pressure data of the injector under test to be obtained in real time during the entire test process. Combined with the flow measurement results of the gas flow meter 55, it can comprehensively and accurately reflect the injection performance of the injector under different back pressure conditions. The coordinated use of the surge tank 54 and the back pressure valve 56 effectively avoids system instability or test interruption caused by sudden changes in back pressure during the test process, while also reducing potential risks to test personnel and equipment and enhancing the safety management of the entire test process.

[0046] Furthermore, a first temperature sensor 531 is provided on the upper shell cavity 533, and a second temperature sensor 532 is provided on the bottom shell cavity 534. The first temperature sensor 531 is used to detect the temperature information of the shell part of the injector 52 under test, and the second temperature sensor 532 is used to detect the temperature information of the nozzle part of the injector 52 under test. At least part of the cooling system module 3 is electrically connected to the first temperature sensor 531, and at least part of the high-temperature heating module 4 is electrically connected to the second temperature sensor 532.

[0047] First temperature sensor 531 and second temperature sensor 532 accurately monitor the temperature of the injector housing and nozzle in real time. Cooling system module 3 and high-temperature heating module 4 automatically adjust the supply of cooling air and heated oil based on this temperature information, ensuring the injector remains stable at the set temperature during testing. This precise temperature control is crucial to the reliability of test results.

[0048] Furthermore, the high-temperature heating module 4 includes: a high-temperature oil-type mold temperature controller 41, which is electrically connected to the second temperature sensor 532, the outlet end of the high-temperature oil-type mold temperature controller 41 is connected to the bottom shell cavity 534 through an oil supply pipeline, and the inlet end of the high-temperature oil-type mold temperature controller 41 is connected to the bottom shell cavity 534 through an oil return pipeline, and the high-temperature oil-type mold temperature controller 41 adjusts the oil temperature according to the temperature information of the nozzle part of the tested injector 52; an oil supply valve 42, which is arranged on the oil supply pipeline; and an oil return valve 45, which is arranged on the oil return pipeline.

[0049] Specifically, the high-temperature oil-type mold temperature controller 41 adjusts the heating and flow rate of the high-temperature oil via the oil supply valve 42 and the oil return valve 45 based on the nozzle end temperature of the injector 52 under test, as fed back by the second temperature sensor 532. This achieves a high temperature state at the nozzle end of the injector 52 under test, simulating the high-temperature environment within the engine cylinder. The high-temperature oil-type mold temperature controller 41 can automatically adjust the temperature of the heated oil based on the nozzle portion temperature information fed back by the second temperature sensor 532, ensuring that the nozzle end can reach and maintain the set high temperature state. The provision of the oil supply valve 42 and the oil return valve 45 allows the high-temperature oil to be supplied to the bottom shell cavity 534 via the oil supply line when needed. Furthermore, after the test is completed or the oil temperature needs to be adjusted, the oil can be recovered to the high-temperature oil-type mold temperature controller 41 via the oil return line for reheating or cooling. This not only improves test efficiency, but also reduces resource consumption, improving the economic and environmental performance of the entire test device.

[0050] In some optional embodiments, the high-temperature heating module 4 further includes: an oil inlet distribution block 43 and an oil return collection block 44 , wherein the oil inlet distribution block 43 is arranged downstream of the oil supply valve 42 , and the oil return collection block 44 is arranged upstream of the oil return valve 45 .

[0051] Furthermore, the cooling system module 3 includes: an air compressor 31; a vortex cooler 33, the outlet end of the air compressor 31 is connected to the inlet end of the vortex cooler 33, and the outlet end of the vortex cooler 33 is connected to the upper shell cavity 533; a proportional control valve 32, the proportional control valve 32 is arranged on the pipeline between the outlet end of the air compressor 31 and the inlet end of the vortex cooler 33, the proportional control valve 32 is electrically connected to the first temperature sensor 531, and the proportional control valve 32 is used to control the flow rate of compressed air in the vortex cooler 33 according to the temperature information of the shell part of the injector 52 under test.

[0052] Specifically, during reliability testing, the temperature of the upper shell of the injector under test (52) gradually rises due to heating from the electromagnetic coil and heat transfer from the high-temperature nozzle end. The proportional control valve 32 of the cooling system module 3 uses the upper shell temperature feedback from the injector under test (52) to control the flow rate of compressed air in the vortex cooler 33, thereby maintaining a stable temperature in the injector's upper shell.

[0053] Furthermore, the gas supply system module 1 includes multiple gas container units 11, the outlet end of each gas container unit 11 is connected to a connecting pipeline, the outlet ends of the multiple connecting pipelines are connected to the inlet end of the common pipeline 14, the outlet end of the common pipeline 14 is connected to the inlet end of the pressure regulating system module 2, and each connecting pipeline is provided with an air intake valve 12 and a one-way valve 13, which control at least one of the multiple air intake valves 12 to be closed, so that at least one of the multiple gas container units 11 is in a standby state.

[0054] The gas supply system module 1 is placed outdoors in an open space to prevent excessive gas in confined spaces. High-pressure gas within the gas container unit 11 enters the common gas pipeline 14 through the inlet valve 12 and the one-way valve 13. The one-way valve 13 effectively prevents reverse gas flow to each gas container unit. Gas container units 11 are typically provided in groups of three, with two in use and one in reserve. When the system requires ventilation, the backup gas container unit 11 is opened and replaced with the two used gas container units 11. This allows for continuous replacement of gas container units 11 without shutting down the system, ensuring long-term reliability testing.

[0055] Furthermore, the test system module 5 also includes: an intake rail pipe 51, the outlet end of the pressure regulating system module 2 is connected to the inlet end of the intake rail pipe 51, and the outlet end of the intake rail pipe 51 is connected to the inlet end of the injector 52 under test. A pressure sensor 511 and a third temperature sensor 512 are provided on the intake rail pipe 51. The pressure sensor 511 is used to detect the gas pressure in the intake rail pipe 51, and the third temperature sensor 512 is used to detect the gas temperature in the intake rail pipe 51. The pressure sensor 511 and the third temperature sensor 512 are electrically connected to at least part of the pressure regulating system module 2.

[0056] Specifically, the pressure sensor 511 and the third temperature sensor 512 enable real-time monitoring of the gas pressure and temperature within the intake rail pipe 51. This real-time data is rapidly fed back to the pressure regulation system module 2, enabling the system to automatically adjust the gas supply pressure and temperature based on current intake conditions, ensuring that intake conditions consistently meet test requirements and improving test accuracy and reliability. The close connection and communication between the intake rail pipe 51 and the pressure regulation system module 2 enables the pressure regulation system to precisely control the system based on pressure and temperature data within the intake rail pipe. This control mechanism simulates intake conditions under various operating conditions. By monitoring the intake status in real time through sensors on the intake rail pipe 51, testers can quickly adjust test parameters based on this real-time data, shortening the test cycle and improving test efficiency.

[0057] Furthermore, the pressure regulating system module 2 includes: a pressure reducer 21, the inlet end of the pressure reducer 21 is connected to the outlet end of the air supply system module 1; a buffer tank 25, the inlet end of the buffer tank 25 is connected to the outlet end of the pressure reducer 21, and the outlet end of the buffer tank 25 is connected to the inlet end of the intake rail pipe 51. The pipeline between the outlet end of the pressure reducer 21 and the inlet end of the buffer tank 25 is sequentially provided with an electrically controlled switching valve 22, an intake pressure sensor 23, and an electrically controlled pressure regulating valve 24. The electrically controlled pressure regulating valve 24 is electrically connected to the pressure sensor 511 and the third temperature sensor 512. The electrically controlled pressure regulating valve 24 is adjusted according to the gas pressure and gas temperature in the intake rail pipe 51.

[0058] Specifically, the pressure reducer 21 performs a first-level pressure reduction on the high-pressure gas of the gas supply system module 1, so that the electronically controlled pressure regulating valve 24 can accurately adjust the system pressure. The electronically controlled switch valve 22 is used to control the opening or closing of the system gas. When gas leakage or system abnormality occurs, the gas supply can be quickly and automatically shut down to improve the test safety. The electronically controlled pressure regulating valve 24 can accurately adjust the inlet pressure of the injector under test 52 according to the pressure and temperature feedback from the intake pressure sensor 23 and the intake rail pipe 51. The buffer tank 25 can reduce the pressure fluctuations generated when the injector under test is working, thereby ensuring the stability of the system pressure.

[0059] In some optional embodiments, the test system module 5 further includes an injector ECU 58 , which is used to control the injector 52 under test to inject gas.

[0060] The ECU (Engine Control Unit) precisely controls the injector's injection timing, frequency, and volume based on pre-set test procedures or real-time feedback data. This control capability is key to testing the injector's dynamic performance and response speed, and helps to further explore the injector's performance characteristics under different operating modes.

[0061] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0062] 1. The modular design makes the system simple and reliable, and each module can be arranged flexibly;

[0063] 2. The gas supply system module can be arranged outdoors or in an independent environment to increase the safety of reliability testing;

[0064] 3. The gas supply system module uses a simple and cheap gas container unit as the gas source. The gas source is simple and reliable, which reduces the test cost.

[0065] 4. The temperature of the upper shell and nozzle end of the tested injector can be controlled, which is close to the actual working state in the engine, and more accurately reflects the reliability performance level of the tested injector.

[0066] 5. It can realize precise adjustment of the intake pressure and the temperature of the nozzle end of the injector under test to meet the testing requirements of different types of injectors.

[0067] 6. It can realize real-time monitoring of the temperature, pressure and flow of the injector under test, and determine the performance and stability of the injector under test.

[0068] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0069] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also falls within the scope of the present invention.

[0070] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A reliability testing device for a direct-injection hydrogen injector, characterized in that: include: An air supply system module (1), the air supply system module (1) being used to provide a test air source to the ejector (52) under test; A pressure regulating system module (2), wherein the outlet end of the gas supply system module (1) is in communication with the inlet end of the pressure regulating system module (2), the outlet end of the pressure regulating system module (2) is in communication with the inlet end of the injector (52) under test, and the pressure regulating system module (2) is used to regulate the gas pressure at the inlet end of the injector (52) under test; A test system module (5), the test system module (5) comprising a test fixture (53) and a test module, the test injector (52) being arranged in the test fixture (53); an environmental simulation module, the environmental simulation module being in communication with a cavity in the test fixture (53), the environmental simulation module being used to simulate specific environmental characteristics of the tested injector (52) during injection, and the test module being used to test the injection condition of the tested injector (52) under the specific environmental characteristics; The test fixture (53) comprises an upper shell cavity (533) and a bottom shell cavity (534) separated from each other, the shell portion of the test injector (52) is arranged in the upper shell cavity (533), the nozzle portion of the test injector (52) is arranged in the bottom shell cavity (534), and the environmental simulation module is in communication with the upper shell cavity (533) and the bottom shell cavity (534); The environmental simulation module includes: A cooling system module (3), wherein an outlet end of the cooling system module (3) is in communication with the upper shell cavity (533), and the cooling system module (3) is used to provide cooling air; A high-temperature heating module (4), wherein the outlet end of the high-temperature heating module (4) is in communication with the bottom shell cavity (534), and the high-temperature heating module (4) is used to provide high-temperature oil.

2. The reliability testing device for a direct-injection hydrogen injector according to claim 1, characterized in that: The test module includes: a pressure stabilizing tank (54), the inlet end of the pressure stabilizing tank (54) being in communication with the outlet end of the bottom shell cavity (534), and the pressure stabilizing tank (54) being used to collect gas ejected from the nozzle portion of the ejector (52) under test; a gas flow meter (55), wherein the inlet end of the gas flow meter (55) is connected to the outlet end of the pressure stabilizing tank (54); A back pressure sensor (57), the back pressure sensor (57) being arranged on a pipeline at the outlet end of the pressure stabilizing tank (54), and the back pressure sensor (57) being used to obtain the back pressure of the gas ejected by the injector (52) under test; A back pressure valve (56) is provided on the pipeline at the outlet end of the pressure stabilizing tank (54), and the back pressure valve (56) is used to adjust the injection back pressure according to the back pressure collected by the back pressure sensor (57).

3. The reliability testing device for a direct-injection hydrogen injector according to claim 1, characterized in that: A first temperature sensor (531) is provided on the upper shell cavity (533), and a second temperature sensor (532) is provided on the bottom shell cavity (534). The first temperature sensor (531) is used to detect temperature information of the shell portion of the injector (52) under test, and the second temperature sensor (532) is used to detect temperature information of the nozzle portion of the injector (52) under test. At least a portion of the cooling system module (3) is electrically connected to the first temperature sensor (531), and at least a portion of the high-temperature heating module (4) is electrically connected to the second temperature sensor (532).

4. The reliability testing device for a direct-injection hydrogen injector according to claim 3, characterized in that: The high-temperature heating module (4) comprises: a high-temperature oil-type mold temperature controller (41), the high-temperature oil-type mold temperature controller (41) being electrically connected to the second temperature sensor (532), the outlet end of the high-temperature oil-type mold temperature controller (41) being connected to the bottom shell cavity (534) via an oil supply pipeline, the inlet end of the high-temperature oil-type mold temperature controller (41) being connected to the bottom shell cavity (534) via an oil return pipeline, and the high-temperature oil-type mold temperature controller (41) adjusting the oil temperature according to the temperature information of the nozzle portion of the injector (52) being tested; an oil supply valve (42), the oil supply valve (42) being arranged on the oil supply pipeline; An oil return valve (45) is provided on the oil return pipeline.

5. The reliability testing device for a direct-injection hydrogen injector according to claim 3, characterized in that: The cooling system module (3) comprises: Air compressor (31); A vortex cooler (33), wherein the outlet end of the air compressor (31) is in communication with the inlet end of the vortex cooler (33), and the outlet end of the vortex cooler (33) is in communication with the upper shell cavity (533); A proportional control valve (32), the proportional control valve (32) is arranged on a pipeline between the outlet end of the air compressor (31) and the inlet end of the vortex cooler (33), the proportional control valve (32) is electrically connected to the first temperature sensor (531), and the proportional control valve (32) is used to control the flow rate of the compressed air in the vortex cooler (33) according to the temperature information of the shell part of the injector (52) under test.

6. The reliability testing device for a direct-injection hydrogen injector according to claim 1, characterized in that: The air supply system module (1) comprises A plurality of gas container units (11), the outlet end of each gas container unit (11) is connected to a connecting pipeline, the outlet ends of the plurality of connecting pipelines are connected to the inlet end of a common pipeline (14), the outlet end of the common pipeline (14) is connected to the inlet end of the pressure regulating system module (2), and an air intake valve (12) and a one-way valve (13) are provided on each of the connecting pipelines, and at least one of the plurality of air intake valves (12) is controlled to be closed, so that at least one of the plurality of gas container units (11) is in a standby state.

7. The reliability testing device for a direct-injection hydrogen injector according to claim 1, characterized in that: The test system module (5) further includes: An intake rail pipe (51), the outlet end of the pressure regulating system module (2) is communicated with the inlet end of the intake rail pipe (51), the outlet end of the intake rail pipe (51) is communicated with the inlet end of the injector (52) to be tested, a pressure sensor (511) and a third temperature sensor (512) are provided on the intake rail pipe (51), the pressure sensor (511) is used to detect the gas pressure in the intake rail pipe (51), the third temperature sensor (512) is used to detect the gas temperature in the intake rail pipe (51), and the pressure sensor (511) and the third temperature sensor (512) are electrically connected to at least part of the pressure regulating system module (2).

8. The reliability testing device for a direct-injection hydrogen injector according to claim 7, characterized in that: The voltage regulation system module (2) comprises: A pressure reducer (21), wherein the inlet end of the pressure reducer (21) is in communication with the outlet end of the air supply system module (1); A buffer tank (25), wherein the inlet end of the buffer tank (25) is communicated with the outlet end of the pressure reducer (21), and the outlet end of the buffer tank (25) is communicated with the inlet end of the intake rail pipe (51). An electrically controlled switch valve (22), an intake pressure sensor (23), and an electrically controlled pressure regulating valve (24) are sequentially provided on the pipeline between the outlet end of the pressure reducer (21) and the inlet end of the buffer tank (25). The electrically controlled pressure regulating valve (24) is electrically connected to the pressure sensor (511) and the third temperature sensor (512). The electrically controlled pressure regulating valve (24) is adjusted according to the gas pressure and gas temperature in the intake rail pipe (51).

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