Reliability testing device for in-cylinder direct injection hydrogen injector

Abstract

The invention provides a reliability testing device for an in-cylinder direct injection hydrogen injector, and relates to the technical field of testing, and the reliability testing device for the in-cylinder direct injection hydrogen injector comprises a gas supply system module which is used for providing a testing gas source for a tested injector; the outlet end of the gas supply system module is communicated with the inlet end of the pressure regulating system module, the outlet end of the pressure regulating system module is communicated with the inlet end of the tested ejector, and the pressure regulating system module is used for regulating the gas pressure of the inlet end of the tested ejector; the test system module comprises a test fixture and a test module, and the tested ejector is arranged in the test fixture; and the environment simulation module is communicated with the cavity in the test fixture, the environment simulation module is used for simulating specific environment characteristics of the tested ejector during injection, and the test module is used for testing the injection condition of the tested ejector under the specific environment 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 leading advantages in power density and zero emissions, and are one of the main technologies for the development of high-power engines in the future. Compared with airway 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 end extends directly into the cylinder, which is corroded by high temperature during combustion. Therefore, the requirements for the injector are higher under special working conditions such as high pressure and high temperature. In order to ensure the reliable operation of the hydrogen engine, the direct-injection hydrogen injector must be subjected to a bench reliability test before installation, that is, to simulate the working conditions of the injector under high pressure and high temperature in the engine to evaluate its performance and life.

[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] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a reliability test device for a direct-injection hydrogen injector is provided. The reliability test device for a 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 the cavity in the test fixture, the environmental simulation module is used to simulate the specific environmental characteristics of the injector under test during injection, and the test module is used to test the injection condition of the injector under test 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 tested injector is arranged in the upper shell cavity, the nozzle part of the tested injector is arranged in the bottom shell cavity, and the environmental simulation module is connected with 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 which is connected to the outlet end of the bottom shell cavity, and the pressure-stabilizing tank is used to collect the gas sprayed 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 sprayed 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 temperature information of the shell part of the injector under test, and the second temperature sensor is used to detect 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, 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, 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, the third temperature sensor is used to detect the gas temperature in the intake rail pipe, and 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, wherein the inlet end of the pressure reducer is connected to the outlet end of the air supply system module; a buffer tank, wherein 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, and an electrically controlled switching valve, an intake pressure sensor, and an electrically controlled pressure regulating valve are sequentially arranged on the pipeline between the outlet end of the pressure reducer and the inlet end of the buffer tank, and the electrically controlled pressure regulating valve is electrically connected to the pressure sensor and the third temperature sensor, and 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 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 in-cylinder direct injection hydrogen injector, but also can perform efficient, safe and accurate testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

[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 switch 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. Return oil valve;

[0023] 5. Test system module;

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

[0025] 52. Injector 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 in the embodiments of the present 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, it indicates 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 can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations 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 that are 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 may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present 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 the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0036] Combination 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, Figure 1 As shown, a reliability test device for an in-cylinder direct injection hydrogen injector comprises: 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 comprises 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 a cavity in the test fixture 53, the environmental simulation module is used to simulate 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 rate to meet the long-term uninterrupted gas supply 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 rate, thereby completing the reliability test of the test injector 52. The device can not only accurately simulate the actual working environment of the in-cylinder direct injection hydrogen injector, 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 design of the upper shell cavity 533 and the bottom shell cavity 534 allows the shell part and the nozzle part of the injector to be temperature controlled and environmentally simulated separately, ensuring that each part can achieve ideal thermodynamic and kinetic conditions during testing, while also improving the sealing of the device. The environmental simulation module is connected to the upper shell cavity 533 and the bottom shell cavity 534, and can adjust the cooling effect of the shell part and the high temperature condition of the nozzle end respectively, which can more accurately simulate the actual working environment of the injector under direct injection in the engine cylinder, thereby obtaining test data that is closer to reality.

[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 keeps 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 keeps 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 temperature 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 of the 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-stabilizing tank 54, the inlet end of which is connected to the outlet end of the bottom shell cavity 534, and the pressure-stabilizing tank 54 is used to collect the gas sprayed 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-stabilizing 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-stabilizing tank 54, and the back-pressure pressure sensor 57 is used to obtain the back-pressure pressure of the gas sprayed 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-stabilizing 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 injector 52 under test spraying into the cylinder of the gas engine.

[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 pressure regulating tank 54 collects the gas ejected from the nozzle. Through its internal volume and structural design, it can effectively reduce the pressure fluctuation during the gas injection process and ensure that the gas is in a stable state before reaching the gas flow meter 55. The setting 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 pressure regulating 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 the potential risks to testers 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] The temperature of the shell part and the nozzle part of the injector under test can be monitored in real time and accurately through the first temperature sensor 531 and the second temperature sensor 532. The cooling system module 3 and the high temperature heating module 4 automatically adjust the supply of cooling air and heating oil according to the temperature information to ensure that the injector can be stably maintained at the set temperature during the test. This precise temperature control is crucial to the reliability of the 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 of the high-temperature oil through the oil supply valve 42 and the oil return valve 45 according to the nozzle end temperature of the tested injector 52 fed back by the second temperature sensor 532, so as to achieve a high temperature state at the nozzle end of the tested injector 52 and simulate the high temperature environment in the engine cylinder. The high-temperature oil-type mold temperature controller 41 can automatically adjust the temperature of the heated oil according to the nozzle part temperature information fed back by the second temperature sensor 532, so as to ensure that the nozzle end can reach and remain in the set high temperature state. The setting of the oil supply valve 42 and the oil return valve 45 enables the high-temperature oil to be supplied to the bottom shell cavity 534 through the oil supply pipeline when necessary. At the same time, 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 through the oil return pipeline for reheating or cooling treatment, which not only improves the test efficiency, but also reduces resource consumption, and improves the economy and environmental protection of the entire test device.

[0050] In some optional embodiments, the high-temperature heating module 4 also 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 the reliability test, the temperature of the upper shell of the tested injector 52 will gradually increase due to the heating of the electromagnetic coil and the high temperature heat transfer at the nozzle end. The proportional control valve 32 of the cooling system module 3 controls the flow rate of the compressed air in the vortex cooler 33 through the upper shell temperature fed back by the tested injector 52, so as to achieve the temperature stability of the upper shell of the injector.

[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 intake valve 12 and a one-way valve 13, which control at least one of the multiple 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 arranged in an open outdoor space to avoid excessive gas in a confined space. The high-pressure gas in the gas container unit 11 enters the gas common pipeline 14 through the air inlet valve 12 and the one-way valve 13. The one-way valve 13 can effectively prevent reverse gas flow to each gas container unit. The gas container units 11 are generally 3 groups, 2 groups are used and 1 group is reserved. When the system needs to be ventilated, open the spare gas container unit 11 and replace the 2 groups of used gas container units 11. The gas container unit 11 can be replaced without stopping the machine, 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, the outlet end of the intake rail pipe 51 is connected to the inlet end of the injector 52 under test, and 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 setting of the pressure sensor 511 and the third temperature sensor 512 can detect the gas pressure and temperature in the intake rail pipe 51 in real time. These real-time data can be quickly fed back to the pressure regulating system module 2, so that the system can automatically adjust the gas supply pressure and temperature according to the current intake conditions, ensuring that the intake conditions always meet the test requirements, and improving the accuracy and reliability of the test. The close connection and communication between the intake rail pipe 51 and the pressure regulating system module 2 enable the pressure regulating system to be accurately controlled based on the pressure and temperature data in the intake rail pipe. This control mechanism can simulate the intake conditions under different working conditions, and monitor the intake status in real time through the sensors on the intake rail pipe 51. Testers can quickly adjust the test parameters based on 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. 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.

[0058] Specifically, the pressure reducer 21 performs a first-stage 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 52 under test 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 , and the injector ECU 58 is used to control the injector 52 under test to inject gas.

[0060] The ECU (Engine Control Unit) can accurately control the injection time, injection frequency and injection volume of the injector according to the preset test program or real-time feedback data. This control capability is the key to testing the dynamic performance and response speed of the injector, and helps to deeply explore the performance characteristics of the injector in different working 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 flexibly arranged;

[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 injector under test can be controlled, which is close to the actual working state in the engine, and more accurately reflects the reliability performance level of the injector under test.

[0066] 5. It can realize precise adjustment of the intake pressure and the temperature of the nozzle end of the tested injector 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 here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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 "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic 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 emphasis. 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 above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reliability test 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 injector (52) under test; A pressure regulating system module (2), wherein the outlet end of the gas supply system module (1) is connected to the inlet end of the pressure regulating system module (2), and 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) 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 is connected to the cavity in the test fixture (53), the environmental simulation module is used to simulate the specific environmental characteristics of the tested injector (52) during injection, and the test module is used to test the injection condition of the tested injector (52) under the specific environmental characteristics.

2. The reliability testing device for the in-cylinder direct injection hydrogen injector according to claim 1 is characterized in that: 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 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).

3. The reliability testing device for the in-cylinder direct injection hydrogen injector according to claim 2 is characterized in that: The environmental simulation module comprises: 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.

4. The reliability testing device for the in-cylinder direct injection hydrogen injector according to claim 2, 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), 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 regulating 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), the back pressure sensor (57) being used to obtain the back pressure of the gas ejected by the ejector (52) under test; A back pressure valve (56), wherein the back pressure valve (56) is arranged 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).

5. The reliability testing device for the in-cylinder direct injection hydrogen injector according to claim 3 is 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 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 a part of the cooling system module (3) is electrically connected to the first temperature sensor (531), and at least a part of the high-temperature heating module (4) is electrically connected to the second temperature sensor (532).

6. The reliability testing device for the in-cylinder direct injection hydrogen injector according to claim 5, 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) 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, 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 injector (52) under test; An oil supply valve (42), the oil supply valve (42) being arranged on the oil supply pipeline; An oil return valve (45), wherein the oil return valve (45) is arranged on the oil return pipeline.

7. The reliability testing device for the in-cylinder direct injection hydrogen injector according to claim 5, 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) being arranged on a pipeline between an outlet end of the air compressor (31) and an inlet end of the vortex cooler (33), the proportional control valve (32) being electrically connected to the first temperature sensor (531), and the proportional control valve (32) being used to control the flow rate of compressed air in the vortex cooler (33) according to temperature information of a shell portion of the injector (52) being tested.

8. 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 of the gas container units (11) being connected to a connecting pipeline, the outlet ends of the plurality of connecting pipelines being connected to the inlet end of a common pipeline (14), the outlet end of the common pipeline (14) being connected to the inlet end of the pressure regulating system module (2), each of the connecting pipelines being provided with an air intake valve (12) and a one-way valve (13), controlling at least one of the plurality of air intake valves (12) to be closed, so that at least one of the plurality of gas container units (11) is in a standby state.

9. The reliability testing device for a direct-injection hydrogen injector according to claim 1, characterized in that: The test system module (5) further comprises: 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), 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), 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).

10. The reliability testing device for the in-cylinder direct injection hydrogen injector according to claim 9, characterized in that: The voltage regulation system module (2) comprises: A pressure reducer (21), wherein an inlet end of the pressure reducer (21) is in communication with an outlet end of the air supply system module (1); A buffer tank (25), wherein 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). An electrically controlled switch valve (22), an intake pressure sensor (23), and an electrically controlled pressure regulating valve (24) are sequentially arranged 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), and 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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