Methods, apparatus, vehicles and procedures for pressure holding test of engine hydrogen supply systems

Abstract

This application relates to the field of engine technology, and particularly to a method, apparatus, vehicle, and program product for testing the pressure holding pressure of an engine hydrogen supply system. The method includes: determining whether the engine has stopped operating; if the engine has stopped operating, upon receiving a check command from the driver, controlling a controller to close a first shut-off valve and open a second shut-off valve, venting hydrogen through a hydrogen exhaust pipe, then closing the second shut-off valve and opening a third shut-off valve to output nitrogen through a nitrogen storage device; controlling a pressure regulating valve to adjust the current pressure of the hydrogen engine to a preset pressure holding pressure, then closing a fourth shut-off valve; detecting a first pressure drop value from a first pressure sensor; if the first pressure drop value is greater than or equal to a first preset threshold within a preset time, then determining that there is a leak in the engine hydrogen supply system. This solves the problem of how to detect hydrogen leaks in the hydrogen supply system of a hydrogen fuel cell engine, effectively reducing maintenance costs and ensuring the safety of the hydrogen supply system.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a method, apparatus, vehicle, and program product for testing the pressure holding of an engine hydrogen supply system. Background Technology

[0002] The hydrogen supply system of a hydrogen fuel cell engine is a critical component ensuring its efficient and safe operation. Due to the highly compressible nature of hydrogen, the design and control of the hydrogen supply system are particularly important. The hydrogen supply system not only affects the thermal efficiency and high performance of the hydrogen fuel cell engine but also plays a vital role in ensuring its safe operation. Leaks in the hydrogen supply system can cause hydrogen to escape, and if the leak is severe, it can threaten environmental and personnel safety. Hydrogen is a gas lighter than air and can spread rapidly after a leak. Hydrogen has a wide flammability range, and if leaked hydrogen encounters an ignition source, it can easily cause a fire or explosion, especially in enclosed or semi-enclosed environments, where the accumulation of hydrogen can reach the explosive limit, posing a serious threat to personnel and equipment safety. To prevent these hazards, a series of measures are needed to promptly detect and address leaks. Summary of the Invention

[0003] This application provides a pressure holding test method, apparatus, vehicle, and program product for an engine hydrogen supply system to solve the problem of how to detect hydrogen leakage in the hydrogen supply system of a hydrogen fuel cell engine, effectively reduce maintenance costs, and ensure the safety of the hydrogen supply system.

[0004] The first aspect of this application provides a pressure holding test method for an engine hydrogen supply system. The method employs a pressure holding test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first shut-off valve, a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipe, and a hydrogen concentration sensor. One end of the first shut-off valve is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the second pressure sensor, the third end of the pressure regulating valve is connected to the controller, the second pressure sensor is connected to the hydrogen storage device, the other end of the first shut-off valve is connected to one end of the fourth shut-off valve and the first end of the hydrogen concentration sensor, one end of the second shut-off valve is connected to one end of the third shut-off valve, the other end of the first shut-off valve, and one end of the fourth shut-off valve, and the other end of the second shut-off valve is connected to the... One end of the hydrogen exhaust pipe is connected to the first pressure sensor, the other end of the third shut-off valve is connected to the nitrogen storage device, the other end of the fourth shut-off valve is connected to the first pressure sensor, and the other end of the hydrogen exhaust pipe is connected to the controller. The system includes the following steps: determining whether the engine has stopped running; if the engine has stopped running, after receiving a check command from the driver, controlling the controller to close the first shut-off valve and open the second shut-off valve, venting hydrogen through the hydrogen exhaust pipe, then closing the second shut-off valve, and opening the third shut-off valve to output nitrogen through the nitrogen storage device; controlling the pressure regulating valve to adjust the current pressure of the hydrogen engine to a preset holding pressure, then closing the fourth shut-off valve; detecting the first pressure drop value of the first pressure sensor, and if the first pressure drop value is greater than or equal to a first preset threshold within a preset time, determining that there is a leak in the engine's hydrogen supply system.

[0005] Optionally, after detecting the first pressure drop value of the first pressure sensor, the method further includes: if the first pressure drop value is less than a first preset threshold within the preset time period, then determining that there is no leakage in the engine hydrogen supply system.

[0006] Optionally, after determining that there is a leak in the engine hydrogen supply system, the method further includes: controlling the fifth shut-off valve located at the inlet of multiple hydrogen nozzles in the engine hydrogen supply system to close; detecting a second pressure drop value in the hydrogen supply pipeline of the engine hydrogen supply system within a preset time period; if the second pressure drop value detected within the preset time period is greater than a second preset threshold, determining that there is a leak in the hydrogen supply pipeline, and sending a hydrogen supply pipeline leak alarm to the target terminal, wherein the first end of the hydrogen supply pipeline is connected to the second end of the first pressure sensor and the hydrogen concentration sensor, the second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth shut-off valve is connected to the controller.

[0007] Optionally, after detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time, the method includes: if the second pressure drop value is less than a third preset threshold within the preset time, determining that at least one hydrogen nozzle is leaking, and sequentially closing the fifth shut-off valve at the inlet of each hydrogen nozzle, and sending a hydrogen nozzle leak alarm to the target terminal.

[0008] Optionally, after determining whether the engine has stopped running, the process includes: if the engine is running, acquiring the actual engine operating rail pressure at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system; when the difference between the actual engine operating rail pressure and the target required rail pressure is greater than a fourth preset threshold, or the current hydrogen concentration value is greater than a fifth preset threshold, sending a hydrogen leakage alarm to the target terminal, and cutting off the hydrogen supply through the first shut-off valve in a preset emergency state, and venting the hydrogen through the hydrogen exhaust pipe.

[0009] A second aspect of this application provides a pressure holding test device for an engine hydrogen supply system. The device employs a pressure holding test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first shut-off valve, a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipe, and a hydrogen concentration sensor. One end of the first shut-off valve is connected to the first end of the pressure regulating valve; the second end of the pressure regulating valve is connected to the second pressure sensor; the third end of the pressure regulating valve is connected to the controller; the second pressure sensor is connected to the hydrogen storage device; the other end of the first shut-off valve is connected to one end of the fourth shut-off valve and the first end of the hydrogen concentration sensor; one end of the second shut-off valve is connected to one end of the third shut-off valve, the other end of the first shut-off valve, and one end of the fourth shut-off valve; and the other end of the second shut-off valve is connected to one end of the hydrogen exhaust pipe. The system is connected as follows: one end of the third shut-off valve is connected to the nitrogen storage device, the other end of the fourth shut-off valve is connected to the first pressure sensor, and the other end of the hydrogen exhaust pipe is connected to the controller. The system includes: a judgment module for determining whether the engine has stopped operating; a control module for, if the engine has stopped operating, upon receiving a check command from the driver, controlling the controller to close the first shut-off valve and open the second shut-off valve, venting hydrogen through the hydrogen exhaust pipe, then closing the second shut-off valve, opening the third shut-off valve to output nitrogen through the nitrogen storage device, controlling the pressure regulating valve to adjust the current pressure of the hydrogen engine to a preset holding pressure, and then closing the fourth shut-off valve; and a detection module for detecting a first pressure drop value from the first pressure sensor. If the first pressure drop value is greater than or equal to a first preset threshold within a preset time, it is determined that there is a leak in the engine's hydrogen supply system.

[0010] Optionally, after detecting the first pressure drop value of the first pressure sensor, the detection module is further configured to: if the first pressure drop value is less than a first preset threshold within the preset time, then determine that there is no leakage in the engine hydrogen supply system.

[0011] Optionally, after determining that there is a leak in the engine hydrogen supply system, the detection module is further configured to: control the fifth shut-off valves installed at the inlets of multiple hydrogen nozzles in the engine hydrogen supply system to close, detect the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within a preset time; if the second pressure drop value detected within the preset time is greater than a second preset threshold, then determine that there is a leak in the hydrogen supply pipeline, and send a hydrogen supply pipeline leak alarm reminder to the target terminal, wherein the first end of the hydrogen supply pipeline is connected to the second end of the first pressure sensor and the hydrogen concentration sensor, the second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth shut-off valve is connected to the controller.

[0012] Optionally, after detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time, the detection module is further configured to: if the second pressure drop value is less than a third preset threshold within the preset time, determine that there is a leak in the at least one hydrogen nozzle, and sequentially close the fifth shut-off valve at the inlet of each hydrogen nozzle, and send a hydrogen nozzle leak alarm reminder to the target terminal.

[0013] Optionally, after determining whether the engine has stopped running, the determination module is further configured to: if the engine is running, acquire the actual engine operating rail pressure at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system; when the difference between the actual engine operating rail pressure and the target required rail pressure is greater than a fourth preset threshold, or the current hydrogen concentration value is greater than a fifth preset threshold, send a hydrogen leakage alarm to the target terminal, and cut off the hydrogen supply through the first shut-off valve in a preset emergency state, and vent the hydrogen through the hydrogen exhaust pipe.

[0014] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the pressure holding test method for the engine hydrogen supply system as described in the above embodiments.

[0015] A fourth aspect of this application provides a computer program product having a computer program stored thereon, which is executed by a processor to implement the pressure holding test method for an engine hydrogen supply system as described in the above embodiments.

[0016] In the above embodiment, it is determined whether the engine has stopped running. If the engine has stopped running, after receiving an inspection command from the driver, the controller closes the first shut-off valve and opens the second shut-off valve. After venting hydrogen through the hydrogen exhaust pipe, the controller closes the second shut-off valve and opens the third shut-off valve to output nitrogen through the nitrogen storage device. The pressure regulating valve is controlled to adjust the current pressure of the hydrogen engine to a preset holding pressure, and then the fourth shut-off valve is closed. The first pressure drop value of the first pressure sensor is detected. If the first pressure drop value is greater than or equal to a first preset threshold within a preset time, it is determined that there is a leak in the hydrogen supply system of the engine. This solves the problem of how to detect hydrogen leaks in the hydrogen supply system of a hydrogen fuel cell engine, effectively reducing maintenance costs and ensuring the safety of the hydrogen supply system.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a flowchart of a pressure holding test method for an engine hydrogen supply system according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the pressure holding test system of an engine hydrogen supply system according to an embodiment of this application;

[0021] Figure 3 This is an example diagram of a pressure holding test apparatus for an engine hydrogen supply system according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of a vehicle structure according to an embodiment of this application. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0024] The following describes a pressure holding test method, apparatus, vehicle, and program product for an engine hydrogen supply system according to embodiments of this application, with reference to the accompanying drawings. Addressing the problem of detecting hydrogen leakage in the hydrogen supply system of a hydrogen fuel cell engine mentioned in the background art, this application provides a pressure holding test method for an engine hydrogen supply system. In this method, it is determined whether the engine has stopped operating. If the engine has stopped operating, after receiving a check command from the driver, the controller closes the first shut-off valve and opens the second shut-off valve. After venting hydrogen through the hydrogen exhaust pipe, the second shut-off valve is closed, and the third shut-off valve is opened to output nitrogen through a nitrogen storage device. The pressure regulating valve is controlled to adjust the current pressure of the hydrogen engine to a preset pressure holding pressure, and then the fourth shut-off valve is closed. The first pressure drop value of the first pressure sensor is detected. If the first pressure drop value is greater than or equal to a first preset threshold within a preset time, it is determined that there is a leak in the engine hydrogen supply system. This solves the problem of how to detect hydrogen leakage in the hydrogen supply system of a hydrogen fuel cell engine, effectively reducing maintenance costs and ensuring the safety of the hydrogen supply system.

[0025] Specifically, Figure 1 This is a schematic flowchart illustrating a pressure holding test method for an engine hydrogen supply system provided in an embodiment of this application.

[0026] like Figure 1 As shown, the pressure holding test method for the hydrogen supply system of this engine includes the following steps:

[0027] The method employs a pressure holding test system, which includes a controller 12, a first pressure sensor 5, a second pressure sensor 2, a hydrogen storage device 1, a first shut-off valve 4, a second shut-off valve 14, a third shut-off valve 10, a fourth shut-off valve 6, a pressure regulating valve 3, a nitrogen storage device 9, a hydrogen exhaust pipeline 11, and a hydrogen concentration sensor 13. One end of the first shut-off valve 4 is connected to the first end of the pressure regulating valve 3, the second end of the pressure regulating valve 3 is connected to the second pressure sensor 2, and the third end of the pressure regulating valve 3 is connected to the controller 12. The second pressure sensor 2 is connected to... The hydrogen storage device 1 is connected, the other end of the first shut-off valve 4 is connected to one end of the fourth shut-off valve 6 and the first end of the hydrogen concentration sensor 13, one end of the second shut-off valve 14 is connected to one end of the third shut-off valve 10, the other end of the first shut-off valve 4 and the fourth shut-off valve 6 respectively, the other end of the second shut-off valve 14 is connected to one end of the hydrogen exhaust pipe 11, the other end of the third shut-off valve 10 is connected to the nitrogen storage device 9, one end of the fourth shut-off valve 6 is connected to the first pressure sensor 5, and the other end of the hydrogen exhaust pipe 11 is connected to the controller 12.

[0028] Specifically, such as Figure 2 As shown in the attached document Figure 1As shown, the pressure holding test system includes: a hydrogen storage device 1, a second pressure sensor 2, a pressure regulating valve 3, a first shut-off valve 4, a second shut-off valve 14, a first pressure sensor 5, a fourth shut-off valve 6, a hydrogen supply pipeline and hydrogen rail assembly 7, a fifth shut-off valve 8 at the hydrogen inlet of each hydrogen nozzle, a nitrogen storage device 9 and a third shut-off valve 10 connected in parallel with the hydrogen storage device 1, a hydrogen exhaust pipeline 11 located at the outlet of the third shut-off valve 4, a controller 12 and a hydrogen concentration sensor 13 arranged at the key interface and the hydrogen rail and injector assembly, the first end of the hydrogen supply pipeline and hydrogen rail assembly 7 being connected to the second end of the first pressure sensor 5 and the hydrogen concentration sensor, the second end of the hydrogen supply pipeline and hydrogen rail assembly 7 being connected to one end of the fifth shut-off valve 8 and the third end of the hydrogen concentration sensor 13, the third end of the hydrogen supply pipeline and hydrogen rail assembly 7 being connected to the controller 12, and the other end of the fifth shut-off valve 8 being connected to the controller 12.

[0029] In step S101, it is determined whether the engine has stopped running.

[0030] In step S102, if the engine stops running, after receiving the inspection command sent by the driver, the controller 12 controls the first shut-off valve 4 to close and the second shut-off valve 14 to open, and after venting the hydrogen through the hydrogen exhaust pipe 11, the controller controls the second shut-off valve 14 to close, and controls the third shut-off valve 10 to open and output nitrogen through the nitrogen storage device 9. The controller controls the pressure regulating valve 3 to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then controls the fourth shut-off valve 6 to close.

[0031] The preset holding pressure can be a threshold set by the user, a threshold obtained through a limited number of experiments, or a threshold obtained through a limited number of computer simulations. In this embodiment, the preset holding pressure is consistent with the hydrogen rail pressure under common operating conditions of hydrogen engines, which can be 1 MPa.

[0032] In step S103, the first pressure drop value of the first pressure sensor 5 is detected. If the first pressure drop value is greater than or equal to the first preset threshold within a preset time, it is determined that there is a leak in the engine hydrogen supply system.

[0033] The first preset threshold and the preset time can be thresholds set by the user, thresholds obtained through a limited number of experiments, or thresholds obtained through a limited number of computer simulations; no specific limitations are made here.

[0034] Specifically, after the car stops, the driver sends an inspection command to the controller 12. After receiving the inspection command, the controller 12 controls the first shut-off valve 4 to close, thereby cutting off the hydrogen supply. The second shut-off valve 14 opens, and the hydrogen is vented through the hydrogen exhaust pipe 11. Then, the controller controls the first shut-off valve 4 to close and the second shut-off valve 14 to close. The controller 12 then controls the third shut-off valve 10 to open, and the nitrogen storage device 9 supplies nitrogen. After the pressure regulating valve 3 is adjusted to the preset pressure holding pressure, the controller controls the fourth shut-off valve 6 to close. The above operation can be understood as the operation process of the pressure holding test.

[0035] Furthermore, the controller 12 monitors the first pressure sensor 5 in real time. If the first pressure drop value detected by the first pressure sensor 5 is greater than or equal to the first preset threshold within a preset time, it is determined that there is a leak in the engine hydrogen supply system, which can also be understood as the current leakage of the hydrogen supply system exceeding the safe range.

[0036] Optionally, in some embodiments, after detecting the first pressure drop value of the first pressure sensor 5, the method further includes: if the first pressure drop value is less than a first preset threshold within a preset time, then it is determined that there is no leakage in the engine hydrogen supply system.

[0037] It is understandable that if the first pressure drop value of the first pressure sensor 5 is less than the first preset threshold within a preset time, it indicates that there is no leakage in the hydrogen supply system, which can also be understood as the current leakage of the hydrogen supply system being within a safe range.

[0038] Optionally, in some embodiments, after determining that there is a leak in the engine hydrogen supply system, the method further includes: controlling the fifth shut-off valve 8, which is installed at the inlet of multiple hydrogen nozzles in the engine hydrogen supply system, to close; detecting a second pressure drop value in the hydrogen supply pipeline of the engine hydrogen supply system within a preset time; if the second pressure drop value detected within the preset time is greater than a second preset threshold, then determining that there is a leak in the hydrogen supply pipeline, and sending a hydrogen supply pipeline leak alarm to the target terminal. The first end of the hydrogen supply pipeline is connected to the second end of the first pressure sensor 5 and the hydrogen concentration sensor 13; the second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve 8 and the third end of the hydrogen concentration sensor 13; the third end of the hydrogen supply pipeline is connected to the controller 12; and the other end of the fifth shut-off valve 8 is connected to the controller 12. The hydrogen supply pipeline is the hydrogen supply pipeline and hydrogen rail assembly 7 mentioned above.

[0039] The preset time and the second preset threshold can be thresholds preset by the user, thresholds obtained through a limited number of experiments, or thresholds obtained through a limited number of computer simulations. In this embodiment, the preset time can be 0.5h and the second preset threshold can be 0.3MPa.

[0040] Specifically, if there is a leak in the engine hydrogen supply system, the fifth shut-off valve 8, which is located at the inlet of multiple hydrogen nozzles in the engine hydrogen supply system, will be closed. The second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system will be detected within a preset time. If the second pressure drop value is greater than the second preset threshold within the preset time, it indicates that there is a leak in the hydrogen supply pipeline. The controller 12 will send a hydrogen supply pipeline leak alarm to the target terminal to remind the user to perform maintenance and repair of the hydrogen supply pipeline.

[0041] Optionally, in some embodiments, after detecting a second pressure drop value in the hydrogen supply line of the engine hydrogen supply system within a preset time, the method includes: if the second pressure drop value is less than a third preset threshold within the preset time, determining that at least one hydrogen nozzle is leaking, and sequentially closing the fifth shut-off valve 8 at the inlet of each hydrogen nozzle, and sending a hydrogen nozzle leak alarm reminder to the target terminal.

[0042] The third preset threshold can be a threshold set by the user, a threshold obtained through a limited number of experiments, or a threshold obtained through a limited number of computer simulations. In this embodiment, the third preset threshold is 0.1 MPa.

[0043] Understandably, if the second pressure drop value of the hydrogen supply line of the engine hydrogen supply system is less than the third preset threshold within a preset time, it indicates that the hydrogen nozzle leakage is large. At this time, the fifth shut-off valve 8 at the hydrogen inlet inside each hydrogen nozzle is closed in sequence according to the set order to ensure that the leakage of one nozzle is tested each time the pressure holding test is performed. The above pressure holding test operation process is repeated, and a hydrogen nozzle leakage alarm reminder is sent to the target terminal to remind the user to perform hydrogen nozzle maintenance and replacement.

[0044] Optionally, in some embodiments, after determining whether the engine has stopped running, the process includes: if the engine is running, obtaining the actual engine operating rail pressure at the second pressure sensor 2 of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor 13 of the engine hydrogen supply system; when the difference between the actual engine operating rail pressure and the target required rail pressure is greater than a fourth preset threshold, or the current hydrogen concentration value is greater than a fifth preset threshold, sending a hydrogen leakage alarm to the target terminal, and cutting off the hydrogen supply through the first shut-off valve 4 in a preset emergency state, and venting the hydrogen through the hydrogen exhaust pipe 11.

[0045] The fourth and fifth preset thresholds can be thresholds set by the user, thresholds obtained through a limited number of experiments, or thresholds obtained through a limited number of computer simulations; no specific limitations are imposed here.

[0046] Specifically, when the engine is running, the controller 12 monitors the second pressure sensor 2, the first pressure sensor 5, and the hydrogen concentration sensor 13 in real time. The detection value of the first pressure sensor 5 is the actual rail pressure of the engine. When the deviation between the actual rail pressure of the engine and the required rail pressure exceeds the fourth preset threshold, or when the current hydrogen concentration value detected by the hydrogen concentration sensor exceeds the fifth preset threshold, the controller promptly sends a hydrogen leakage alarm reminder from the hydrogen supply system to the target terminal. In an emergency, for example, when the current hydrogen concentration value exceeds the preset maximum warning value, the first shut-off valve 4 cuts off the hydrogen supply and the hydrogen is vented through the hydrogen exhaust pipe 11.

[0047] According to the pressure holding test method for the hydrogen supply system of the engine proposed in this application, the method determines whether the engine has stopped running. If the engine has stopped running, after receiving an inspection command from the driver, the controller closes the first shut-off valve and opens the second shut-off valve. After venting hydrogen through the hydrogen exhaust pipe, the controller closes the second shut-off valve and opens the third shut-off valve to output nitrogen through the nitrogen storage device. The pressure regulating valve adjusts the current pressure of the hydrogen engine to the preset pressure holding pressure, and then the fourth shut-off valve closes. The method detects the first pressure drop value of the first pressure sensor. If the first pressure drop value is greater than or equal to the first preset threshold within a preset time, it is determined that there is a leak in the hydrogen supply system of the engine. This solves the problem of how to detect hydrogen leaks in the hydrogen supply system of a hydrogen fuel cell engine, effectively reducing maintenance costs and ensuring the safety of the hydrogen supply system.

[0048] Next, referring to the accompanying drawings, a pressure holding test device for an engine hydrogen supply system proposed according to an embodiment of this application is described.

[0049] Figure 3 This is a block diagram of the pressure holding test device for the engine hydrogen supply system according to an embodiment of this application.

[0050] The device employs a pressure holding test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first shut-off valve, a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline, and a hydrogen concentration sensor. One end of the first shut-off valve is connected to the first end of the pressure regulating valve; the second end of the pressure regulating valve is connected to the second pressure sensor; the third end of the pressure regulating valve is connected to the controller; the second pressure sensor is connected to the hydrogen storage device; the other end of the first shut-off valve is connected to one end of the fourth shut-off valve and the hydrogen concentration sensor; one end of the second shut-off valve is connected to one end of the third shut-off valve, the other end of the first shut-off valve, and one end of the fourth shut-off valve; the other end of the second shut-off valve is connected to one end of the hydrogen exhaust pipeline; the other end of the third shut-off valve is connected to the nitrogen storage device; the other end of the fourth shut-off valve is connected to the first pressure sensor; and the other end of the hydrogen exhaust pipeline is connected to the controller. The pressure holding test device 10 for the engine hydrogen supply system includes a judgment module 100, a control module 200, and a detection module 300.

[0051] The system includes a judgment module 100 for determining whether the engine has stopped running; a control module 200 for controlling the first shut-off valve to close and the second shut-off valve to open after receiving a check command from the driver if the engine has stopped running, and for venting hydrogen through the hydrogen exhaust pipe before closing the second shut-off valve, and for opening the third shut-off valve to output nitrogen through the nitrogen storage device, and for adjusting the current pressure of the hydrogen engine to a preset holding pressure by controlling the pressure regulating valve, and then closing the fourth shut-off valve; and a detection module 300 for detecting the first pressure drop value of the first pressure sensor, and for determining that there is a leak in the engine hydrogen supply system if the first pressure drop value is greater than or equal to a first preset threshold within a preset time.

[0052] Optionally, in some embodiments, after detecting the first pressure drop value of the first pressure sensor, the detection module 300 is further configured to: if the first pressure drop value is less than a first preset threshold within a preset time, then determine that there is no leakage in the engine hydrogen supply system.

[0053] Optionally, in some embodiments, after determining that there is a leak in the engine hydrogen supply system, the detection module 300 is further configured to: control the fifth shut-off valves installed at the inlets of multiple hydrogen nozzles in the engine hydrogen supply system to close; detect the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within a preset time; if the second pressure drop value detected within the preset time is greater than a second preset threshold, then determine that there is a leak in the hydrogen supply pipeline, and send a hydrogen supply pipeline leak alarm reminder to the target terminal, wherein the first end of the hydrogen supply pipeline is connected to the second end of the first pressure sensor and the hydrogen concentration sensor, the second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth shut-off valve is connected to the controller.

[0054] Optionally, in some embodiments, after detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within a preset time, the detection module 300 is further configured to: if the second pressure drop value is less than a third preset threshold within the preset time, determine that at least one hydrogen nozzle is leaking, and sequentially close the fifth shut-off valve at the inlet of each hydrogen nozzle, and send a hydrogen nozzle leak alarm reminder to the target terminal.

[0055] Optionally, in some embodiments, after determining whether the engine has stopped running, the determination module 100 is further configured to: if the engine is running, obtain the actual rail pressure of the engine at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system; when the difference between the actual rail pressure of the engine and the target required rail pressure is greater than a fourth preset threshold, or the current hydrogen concentration value is greater than a fifth preset threshold, send a hydrogen leakage alarm to the target terminal, and cut off the hydrogen supply through the first shut-off valve in a preset emergency state, and vent the hydrogen through the hydrogen exhaust pipe.

[0056] It should be noted that the explanation of the aforementioned embodiment of the pressure holding test method for the engine hydrogen supply system also applies to the pressure holding test device for the engine hydrogen supply system in this embodiment, and will not be repeated here.

[0057] According to the pressure holding test device for the hydrogen supply system of the engine proposed in this application, the device determines whether the engine has stopped running. If the engine has stopped running, after receiving an inspection command sent by the driver, the device controls the first shut-off valve to close and the second shut-off valve to open. After venting hydrogen through the hydrogen exhaust pipe, the device controls the second shut-off valve to close and the third shut-off valve to open, outputting nitrogen through the nitrogen storage device. The device controls the pressure regulating valve to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then controls the fourth shut-off valve to close. The device detects the first pressure drop value of the first pressure sensor. If the first pressure drop value is greater than or equal to the first preset threshold within a preset time, the device determines that there is a leak in the hydrogen supply system of the engine. This solves the problem of how to detect hydrogen leaks in the hydrogen supply system of a hydrogen fuel cell engine, effectively reducing maintenance costs and ensuring the safety of the hydrogen supply system.

[0058] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0059] The memory 401, the processor 402, and the computer program stored on the memory 401 and capable of running on the processor 402.

[0060] When processor 402 executes the program, it implements the pressure holding test method for the engine hydrogen supply system provided in the above embodiments.

[0061] Furthermore, the vehicle also includes:

[0062] Communication interface 403 is used for communication between memory 401 and processor 402.

[0063] The memory 401 is used to store computer programs that can run on the processor 402.

[0064] The memory 401 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0065] If the memory 401, processor 402, and communication interface 403 are implemented independently, then the communication interface 403, memory 401, and processor 402 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized into address buses, data buses, control buses, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0066] Optionally, in a specific implementation, if the memory 401, processor 402, and communication interface 403 are integrated on a single chip, then the memory 401, processor 402, and communication interface 403 can communicate with each other through an internal interface.

[0067] Processor 402 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0068] This application also provides a computer program product on which a computer program is stored, which, when executed by a processor, implements the pressure holding test method of the engine hydrogen supply system as described above.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0072] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be specifically implemented in any computer program product for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer program product" can be any means that can contain, store, communicate, propagate, or transmit a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer program products include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic device, and portable optical disc read-only memory (CDROM). Furthermore, the computer program product can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0073] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0074] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer program product, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0075] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer program product.

[0076] The computer program product mentioned above may be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for testing the pressure holding capacity of an engine hydrogen supply system, characterized in that, The method employs a pressure holding test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first shut-off valve, a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline, and a hydrogen concentration sensor. One end of the first shut-off valve is connected to the first end of the pressure regulating valve; the second end of the pressure regulating valve is connected to the second pressure sensor; the third end of the pressure regulating valve is connected to the controller; the second pressure sensor is connected to the hydrogen storage device; the other end of the first shut-off valve is connected to one end of the fourth shut-off valve and the first end of the hydrogen concentration sensor; one end of the second shut-off valve is connected to one end of the third shut-off valve, the other end of the first shut-off valve, and one end of the fourth shut-off valve; the other end of the second shut-off valve is connected to one end of the hydrogen exhaust pipeline; the other end of the third shut-off valve is connected to the nitrogen storage device; the other end of the fourth shut-off valve is connected to the first pressure sensor; and the other end of the hydrogen exhaust pipeline is connected to the controller. The method includes the following steps: Determine if the engine has stopped running; If the engine stops running, after receiving the inspection command sent by the driver, the controller controls the first shut-off valve to close and the second shut-off valve to open, and after venting the hydrogen through the hydrogen exhaust pipe, the controller controls the second shut-off valve to close, and controls the third shut-off valve to open to output nitrogen through the nitrogen storage device. The controller controls the pressure regulating valve to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then controls the fourth shut-off valve to close. The first pressure drop value of the first pressure sensor is detected. If the first pressure drop value is greater than or equal to a first preset threshold within a preset time, it is determined that there is a leak in the engine hydrogen supply system. After determining that there is a leak in the engine's hydrogen supply system, the following steps are also included: The fifth shut-off valve located at the inlet of multiple hydrogen nozzles in the engine hydrogen supply system is closed, and the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system is detected within the preset time. If the second pressure drop value is detected to be greater than the second preset threshold within the preset time, it is determined that there is a leak in the hydrogen supply pipeline, and a hydrogen supply pipeline leak alarm is sent to the target terminal. The first end of the hydrogen supply pipeline is connected to the second end of the first pressure sensor and the hydrogen concentration sensor. The second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor. The third end of the hydrogen supply pipeline is connected to the controller. The other end of the fifth shut-off valve is connected to the controller. After detecting the second pressure drop value of the hydrogen supply line of the engine hydrogen supply system within the preset time period, the process includes: If the second pressure drop value is less than the third preset threshold within the preset time, it is determined that at least one hydrogen nozzle is leaking, and the fifth shut-off valve at the inlet of each hydrogen nozzle is closed in sequence, and a hydrogen nozzle leak alarm is sent to the target terminal.

2. The method according to claim 1, characterized in that, After detecting the first pressure drop value of the first pressure sensor, the method further includes: If the first pressure drop value is less than the first preset threshold within the preset time, it is determined that there is no leakage in the engine hydrogen supply system.

3. The method according to claim 1, characterized in that, After determining whether the engine has stopped running, the following steps are included: If the engine is running, the actual rail pressure of the engine during operation at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system are obtained. When the difference between the actual rail pressure and the target rail pressure of the engine is greater than the fourth preset threshold, or when the current hydrogen concentration is greater than the fifth preset threshold, a hydrogen leak alarm is sent to the target terminal, and in a preset emergency state, the hydrogen supply is cut off through the first shut-off valve and the hydrogen is vented through the hydrogen exhaust pipe.

4. A pressure holding test device for an engine hydrogen supply system, characterized in that, The device employs a pressure holding test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first shut-off valve, a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline, and a hydrogen concentration sensor. One end of the first shut-off valve is connected to the first end of the pressure regulating valve; the second end of the pressure regulating valve is connected to the second pressure sensor; the third end of the pressure regulating valve is connected to the controller; the other end of the first shut-off valve is connected to one end of the fourth shut-off valve and the first end of the hydrogen concentration sensor; one end of the second shut-off valve is connected to one end of the third shut-off valve, the other end of the first shut-off valve, and one end of the fourth shut-off valve; the other end of the second shut-off valve is connected to one end of the hydrogen exhaust pipeline; the other end of the third shut-off valve is connected to the nitrogen storage device; the other end of the fourth shut-off valve is connected to the first pressure sensor; and the other end of the hydrogen exhaust pipeline is connected to the controller. The device includes: The judgment module is used to determine whether the engine has stopped running; The control module is used to, upon receiving an inspection command from the driver, control the first shut-off valve to close and the second shut-off valve to open via the controller if the engine stops running. After venting hydrogen through the hydrogen exhaust pipe, it controls the second shut-off valve to close and controls the third shut-off valve to open to output nitrogen through the nitrogen storage device. After controlling the pressure regulating valve to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, it controls the fourth shut-off valve to close. The detection module is used to detect the first pressure drop value of the first pressure sensor. If the first pressure drop value is greater than or equal to a first preset threshold within a preset time, it is determined that there is a leak in the engine hydrogen supply system. After determining that there is a leak in the engine's hydrogen supply system, the detection module is further used for: The fifth shut-off valve located at the inlet of multiple hydrogen nozzles in the engine hydrogen supply system is closed, and the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system is detected within the preset time. If the second pressure drop value is detected to be greater than the second preset threshold within the preset time, it is determined that there is a leak in the hydrogen supply pipeline, and a hydrogen supply pipeline leak alarm is sent to the target terminal. The first end of the hydrogen supply pipeline is connected to the second end of the first pressure sensor and the hydrogen concentration sensor. The second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor. The third end of the hydrogen supply pipeline is connected to the controller. The other end of the fifth shut-off valve is connected to the controller. After detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within a preset time, the detection module is further configured to: if the second pressure drop value is less than a third preset threshold within the preset time, determine that at least one hydrogen nozzle is leaking, and sequentially close the fifth shut-off valve at the inlet of each hydrogen nozzle, and send a hydrogen nozzle leak alarm reminder to the target terminal.

5. The apparatus according to claim 4, characterized in that, After detecting the first pressure drop value of the first pressure sensor, the detection module is further configured to: If the first pressure drop value is less than the first preset threshold within the preset time, it is determined that there is no leakage in the engine hydrogen supply system.

6. A vehicle, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the pressure holding test method for the engine hydrogen supply system as described in any one of claims 1-3.

7. A computer program product, said computer program product storing a computer program, characterized in that, When executed by the processor, the program implements the pressure holding test method for the engine hydrogen supply system as described in any one of claims 1-3.

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